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, 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 structure is simple, process implementation is facilitated, the supporting plate is designed to be of a novel split type structure, the bolt connecting structure is combined, the connecting strength between the inner cover and the outer cover of the air inlet channel is effectively improved, and stable connection between the inner cover and the outer cover is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of ramjet engines, and in particular to a ramjet engine afterburning intake duct inner and outer cover connection structure. Background Art

[0002] The rocket ramjet solid engine is mainly composed of a combustion chamber, a nozzle, a safety ignition device, an air intake refueling system, and engine direct parts. The refueling can be performed by sucking air through the air intake duct, which can greatly improve the combustion efficiency and specific impulse, and improve the engine's working efficiency. The air intake duct design is a key part of the ramjet engine design and a key component for realizing the ramjet engine function. The engine air intake duct is mainly composed of three parts: the inner cover, the outer cover, and the tail cover. The air intake duct is between the inner and outer covers, and the connecting device between the inner and outer covers is a key component to ensure the structural integrity of the engine.

[0003] The existing ramjet engine inlet inner cover and inlet outer cover are mainly connected by an integrated support plate, and bolt holes are arranged on the support plate. When the ramjet engine is working, the inlet takes in air, and the inner cover and the outer cover are subjected to axial force, which acts on 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, and is very easy to cause 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 and high-strength working environment of existing ramjet engines. Summary of the invention

[0005] The invention provides a ramjet engine afterburning intake duct inner and outer covers connection structure to solve the problems of low strength and poor connection safety of the existing ramjet engine intake duct inner cover and intake duct outer cover using an integrated support plate connection structure.

[0006] In order to solve the above technical problems, one of the objects of the present invention is to provide a device for connecting the inner and outer covers of a ramjet engine's post-combustion inlet duct. The device is fixed with a circumferential support plate. The support plate adopts a split structure, which is divided into a front section and a rear section of the support plate. The support plate structure adopts an offset installation method, and the inner and outer covers limit displacement to each other, thereby playing a limiting function.

[0007] Furthermore, the rear section of the support plate is integrally formed with the inner cover, a leakage hole is provided at the center of the support plate, and a bolt hole is provided at the rear side of the support plate.

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

[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 leakage hole is arranged in a racetrack shape.

[0011] Furthermore, the air inlet cover is connected to the rear section of the support plate by bolts, which play a role in positioning and auxiliary connection.

[0012] The above one or more technical solutions of the present invention have at least one or more of the following technical effects:

[0013] The patented structure of the present invention is simple and easy to implement. At the same time, the support plate design adopts a new split structure, combined with a bolt connection structure, which effectively improves the connection strength between the inner and outer covers of the air inlet duct and ensures a stable connection between the inner and outer covers. At the same time, according to simulation verification, the support plate has high structural strength and can adapt to high temperature and high pressure working environment, which effectively solves the connection problem between the inner and outer covers of the ramjet engine and provides a solution to the connection problem of this type of ramjet engine. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

[0016] Figure 3 : Sectional view of the air intake inner cover;

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

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

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

[0020] Among them: 1-front half of the support plate, 2-rear half of the support plate, 3-leakage hole, 4-bolt hole, 5-outer cover, 6-inner cover. Specific implementation plan

[0021] The present invention relates to a ramjet engine, and mainly to a connection structure of inner and outer covers of an air intake duct in a ramjet engine. For the air intake duct of a ramjet engine, the air intake duct is generally divided into an inner cover, an outer cover and a tail cover. To ensure the normal operation of the ramjet engine, the connection between the inner cover and the outer cover needs to be stable and reliable, and the relative position remains fixed, so the connection structure design between the inner and outer covers is very important for the normal operation of the ramjet engine.

[0022] The invention patent of this invention provides a new type of split support plate connection structure, which can be mainly used for the connection of the inner and outer covers of the ramjet engine air intake. The split support plate connection can greatly improve the connection strength of the inner and outer covers of the air intake. The support plate structure adopts a split design. In order to improve the connection strength, a bolt connection structure is designed at the rear end of the support plate. The combination of the two connection methods further improves the connection strength between the inner and outer covers of the air intake. And based on the split support plate staggered connection method, the front and rear support plates are staggered after installation, which limits the relative displacement between the inner and outer covers and plays a limiting role.

[0023] The following is a clear and complete description of the technical solutions in the embodiments of the present invention in combination with the embodiments of the present invention and the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the obtained embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the present invention.

[0024] The present invention discloses a device for connecting inner and outer covers of a ramjet engine afterburning intake duct. The device is fixed by a circumferential support plate. The support plate adopts a split structure, including a front section of the support plate and a rear section of the support plate. The inner and outer covers of the intake duct are staggered by the support plate structure. The support plate structure combined with the positioning bolts of the rear half of the support plate can limit the mutual displacement of the inner and outer covers, and play a limiting function. The rear section of the support plate is integrally formed with the inner cover, and a leakage hole is provided at the center of the support plate, and a bolt hole is provided on the rear side of the support plate. The bolts on the bolt holes play a positioning function and are not subject to shear force when the engine is working. The front section of the support plate is integrally formed with the outer cover, and a leakage hole and a bolt hole are provided 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 leakage hole is set as a runway shape, and when the engine is working, the front intake can be discharged from the rear end of the support plate. The intake duct outer cover and the rear section of the support plate are connected by bolts, which play a positioning and auxiliary connection role. The patented structure of the present invention is simple and easy to implement. The support plate design adopts a new split structure, combined with a bolt connection structure, which effectively improves the connection strength between the inner and outer covers of the air intake duct and ensures a stable connection between the inner and outer covers. Compared with the one-piece support plate connection, the main stress point of the one-piece support plate when the engine is working is the bolts between the support plates. The bolts are subject to strong shear force and are easy to break. The main stress point of the split support plate when the engine is working is the connection surface between the split support plates. The bolts at the back mainly play a positioning function, and the connection is more stable.

[0025] According to the characteristics of the ramjet engine air intake, the present invention comprehensively considers the appearance and stress characteristics of the ramjet engine air intake inner cover and the air intake outer cover, and designs a support plate structure with stronger connection structure strength. The support plate structure is mainly used to connect the ramjet engine air intake outer cover and the inner cover. Different from the previous integrated support plate structure, the support plate structure of the present invention adopts a split design. The front half of the support plate is integrally formed with the outer cover, and the rear half of the support plate is integrally formed with the inner cover. The rear half is designed with oblique flow holes and bolt connection structure. The support plate structure and the bolt connection structure are used together to connect the inner and outer covers, further improving the structural strength of the support plate connection and improving the safety of the inner and outer cover connection. In addition, the split support plate connection method adopts a staggered installation method, and the inner and outer covers restrict displacement from each other, which plays a limiting function.

[0026] The split support plate adopted by the present invention has the main stress-bearing part being the connection surface of the split support plate when the ramjet engine is working, with a large stress-bearing range, small stress, and a relatively stable connection structure. The bolt connection structure at the rear end mainly plays a positioning and auxiliary connection role, and is subjected to small stress. The tail bolts of the split support plate are more subjected to the circumferential positioning force when working, avoiding the shear force in the axial direction.

[0027] The engine inlet profile includes an inner cover profile and an outer cover profile, wherein the inner cover profile is divided into several parts including a compression section, a throat isolation section and a diffuser section, and the outer cover profile is 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 inlet duct are connected by a combination of support plates and bolts. The inner and outer covers are staggered and installed by support plate connection, which plays a connecting role and a limiting function at the same time. At the same time, bolts are used for lateral connection. The bolt connection plays a positioning and auxiliary connection role, meeting the safety design requirements.

[0029] When assembling the inner and outer covers, the main assembly method is staggered installation. The inner and outer covers are first moved axially, and then moved to the specified position, and then rotated circumferentially to the specified position. The split support plate is staggered and fixed, and the bolts at the rear end of the support plate are used for positioning and fixing.

[0030] like Figure 1 As shown in the figure, the engine air intake consists of an inner cover and an outer cover. The inner and outer covers are fixed by a circumferential support plate. The support plate adopts a split structure, with the rear half integrated with the inner cover and the front half integrated with the outer cover. The support plate is in the shape of a willow leaf, and each support plate is fastened to the outer cover by radial bolts. A leakage hole is set on the compression surface section of the inner cover. The air intake is located at the tail of the combustion chamber and intakes air from the small end of the diffuser section.

[0031] The inner cover diagram is as follows Figure 2 As shown, the rear section of the support plate is integrally formed with the inner cover. There is a drain hole in the center of the support plate and a bolt hole on the rear side of the support plate. The cross-sectional view of the inner cover is as shown in Figure 3 The schematic diagram of the outer cover is shown in 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 back. The cross-sectional view of the outer cover is shown in Figure 5 In order to increase the bearing capacity of the inner and outer covers, the support plate adopts a split structure, and the rear half is formed integrally with the inner cover. The strength of the support plate is checked according to the design of the engine intake duct. The stress at the joint of the support plate is within the pressure range and meets the use requirements. Figure 6 The leakage hole is runway type, and the air inlet cover and the rear half of the support plate are connected with M6 bolts.

[0032] The present invention is intended to be applied on a tester, and the test results are awaiting verification. According to the simulation results, the invention has a complete structure and strong high-pressure resistance. The split support plate not only fixes the inner and outer covers, but also plays a fixed and limited role because of its staggered installation method. It is suitable for promotion and application in the ramjet engine intake structure.

[0033] Obviously, those skilled in the art can make various changes and modifications to the embodiments of the present invention without departing from the spirit and scope of the embodiments of the present invention. Thus, if these modifications and variations of the embodiments of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A ramjet engine afterburning inlet duct inner and outer cover connection device, characterized in that: The connecting device is fixed with a circumferential support plate. The support plate adopts a split structure, which is divided into a front section and a rear section of the support plate. The inner and outer covers are installed in a staggered manner through the support plate structure. The staggered installation of the support plate realizes mutual restriction of displacement between the inner and outer covers and plays a limiting function.

2. The ramjet engine afterburning inlet duct inner and outer cover connection device according to claim 1, characterized in that: The rear section of the support plate is integrally formed with the inner cover, a drainage hole is arranged at the center of the support plate, and a bolt hole is arranged at the rear side of the support plate.

3. The ramjet engine afterburning inlet duct inner and outer cover connection device according to claim 1, characterized in that: The front section of the support plate is integrally formed with the outer cover, and a drainage hole and a bolt hole are arranged at the rear.

4. The ramjet engine afterburning inlet duct inner and outer cover connection device according to claim 1, characterized in that: The split support plate structure is willow-leaf-shaped, and each support plate is fastened to the outer cover by radial bolts.

5. The ramjet engine afterburning inlet duct inner and outer cover connection device according to claim 1, characterized in that: The leakage hole is arranged in a racetrack shape.

6. The ramjet engine afterburning inlet duct inner and outer cover connection device according to claim 1, characterized in that: The bolt connection structure between the inner and outer covers of the air intake duct 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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