Multi-branch diffusion box bottom force transmission structure

Abstract

The invention relates to a multi-branch diffusion box bottom force transmission structure, and belongs to the technical field of aerospace vehicle propellant storage box structures, the multi-branch diffusion box bottom force transmission structure comprises a thrust ring base plate, a thrust ring outer ring, a thrust ring butt joint plate and a thrust ring inner ring, the thrust ring base plate is of a flat plate structure with a hole in the center, the thrust ring outer ring is of a cylindrical structure, and the inner diameters of the upper end face and the lower end face are different; the thrust ring butt joint plate is arranged on the upper end face of the thrust ring outer ring and used for being connected with an engine rack; the thrust ring inner ring is of a cylindrical structure with the upper end face and the lower end face being the same in inner diameter and is arranged in a cavity of the thrust ring outer ring, one end of the thrust ring inner ring is connected with the thrust ring butt-joint plate, and the other end of the thrust ring inner ring is connected with the thrust ring base plate which is connected with the storage tank bottom. The thrust ring structure is additionally arranged on the outer side of the bottom of the storage box, the thrust ring is connected with the bottom of the storage box through multiple branches, thrust transmitted by an engine rack is diffused to a main structure of the bottom of the storage box through the thrust ring, and the effects of saving an engine force transmission section and improving the engine force transmission efficiency are achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to a multi-branch diffusion tank bottom force transmission structure, and belongs to the technical field of propellant tank structure of space launch vehicle. BACKGROUND

[0002] Structural efficiency is one of the most important indicators pursued by launch vehicle structural system. In order to improve the structural efficiency of the rocket, more and more rockets adopt the way of reducing the length of the shell and reducing the weight of unnecessary structural sections to reduce the take-off weight of the rocket. The propellant tank is a key component of the power system and the structural system of the launch vehicle, which plays the role of force transmission, shape maintenance, storage and transportation of propellant, and accounts for about 50-60% of the weight of the rocket structure. The light weight and reliability of the tank are required.

[0003] Generally, the interstage section of the traditional rocket is omitted, and the engine of the rocket is directly connected to the top of the tank bottom through a transition ring, and the engine thrust is directly transmitted by the tank bottom, which can maximize the structural efficiency. It is known that this technology is used to transmit the engine thrust to the ellipsoidal tank bottom in a whole circle, and the ellipsoidal tank bottom is integrally formed with a bottom, and the local thickness of the tank bottom is increased by using a mold to increase the overall stiffness of the tank bottom. However, this scheme is only suitable for aluminum alloy tanks with good plate machining performance, and is not suitable for stainless steel tanks. In addition, this scheme is only suitable for tank bottoms with small diameters. Because the larger the diameter, the smaller the overall stiffness of the tank bottom. In order to meet the strength and stiffness requirements at the same time, the local thickness of the structure on the tank bottom force transmission path will be very large, and the cost of raw materials and manufacturing will be very high. SUMMARY

[0004] The purpose of the present application is to overcome the above-mentioned shortcomings of the prior art, and to provide a multi-branch diffusion tank bottom force transmission structure. The thrust ring structure is added outside the tank bottom, and the thrust ring is connected to the tank bottom through multiple branches. The thrust ring diffuses the thrust transmitted by the engine frame to the main structure of the tank bottom, thereby achieving the effect of omitting the engine force transmission section and improving the engine force transmission efficiency.

[0005] The above-mentioned purpose of the present application is mainly realized by the following technical scheme:

[0006] The application discloses a multi-branch diffusion tank bottom force transmission structure, which comprises a thrust ring base plate, a thrust ring outer ring, a thrust ring butt joint plate and a thrust ring inner ring, wherein the thrust ring base plate is a center-holed flat plate structure, the thrust ring outer ring is a cylindrical structure with open upper and lower end faces, the inner diameter of the upper end face is smaller than that of the lower end face, and the lower end face of the thrust ring outer ring is connected with the thrust ring base plate; the thrust ring butt joint plate is arranged on the upper end face of the thrust ring outer ring and is used for connecting an engine frame; the thrust ring inner ring is a cylindrical structure with open upper and lower end faces, the inner diameters of the upper and lower end faces are the same, the thrust ring inner ring is arranged in the cavity of the thrust ring outer ring, one end of the thrust ring inner ring is connected with the thrust ring butt joint plate, and the other end of the thrust ring inner ring is connected with the thrust ring base plate; and the thrust ring base plate is connected with a tank bottom.

[0007] In the multi-branch diffusion tank bottom force transmission structure, the lower end face of the thrust ring outer ring is connected with the thrust ring base plate through a plurality of thrust ring outer support corner pieces, and the plurality of thrust ring outer support corner pieces are arranged in a ring shape along the thrust ring outer ring and the thrust ring base plate.

[0008] In the multi-branch diffusion tank bottom force transmission structure, the thrust ring outer support corner pieces are formed by shape welding at the joint of the thrust ring outer ring and the thrust ring base plate, a part of the thrust ring outer support corner pieces is connected with the thrust ring outer ring, and the other part is connected with the thrust ring base plate.

[0009] In the multi-branch diffusion tank bottom force transmission structure, a plurality of thrust ring inner support plates are arranged in the cavity formed by the outer wall surface of the thrust ring inner ring and the inner wall surface of the thrust ring outer ring, and the thrust ring inner support plates are connected with the outer wall surface of the thrust ring inner ring, the inner wall surface of the thrust ring outer ring and the lower surface of the thrust ring butt joint plate, so as to play the roles of force transmission and structure reinforcement.

[0010] In the multi-branch diffusion tank bottom force transmission structure, the plurality of thrust ring inner support plates are arranged in a ring shape, each thrust ring inner support plate is a right-angled trapezoid, the upper base of the trapezoid is welded with the thrust ring butt joint plate, and the two waists are welded with the thrust ring outer ring and the thrust ring inner ring respectively.

[0011] In the multi-branch diffusion tank bottom force transmission structure, the plurality of thrust ring inner support plates are densely arranged in the position along the engine thrust direction, that is, the arrangement spacing of the thrust ring inner support plates in the position along the engine thrust direction is smaller than that in other positions.

[0012] In the multi-branch diffusion tank bottom force transmission structure, a thrust ring outer ring reinforcing plate is arranged, the thrust ring outer ring is obtained by welding a plurality of skins, the welding seams are reinforced by the thrust ring outer ring reinforcing plate, and the structural rigidity is improved.

[0013] In the multi-branch diffusion tank bottom force transmission structure, the inner diameters of the thrust ring base plate, the thrust ring butt joint plate and the thrust ring inner ring are the same.

[0014] In the multi-branch diffusion tank bottom force transmission structure, the materials of the thrust ring base plate, the thrust ring outer ring, the thrust ring butt joint plate, the thrust ring inner ring and the thrust ring inner support plate are all stainless steel.

[0015] In the multi-branch diffusion tank bottom force transmission structure, the thrust transmitted by the engine frame is transmitted to the thrust ring inner ring, the thrust ring inner support plate, the thrust ring outer ring and the thrust ring base plate through the thrust ring butt joint surface; and the thrust ring base plate diffuses the thrust to the tank bottom.

[0016] Compared with the prior art, the present application has at least the following beneficial effects:

[0017] (1) Compared with the prior art, the present application eliminates the transition force transmission section between the rocket engine and the tank, adopts a specially designed thrust ring structure outside the tank bottom, connects the thrust ring and the tank bottom through multiple branches, diffuses the thrust transmitted by the engine frame to the tank bottom main structure through the thrust ring, eliminates the separate engine force transmission section structure, shortens the rocket body structure length, improves the space utilization rate and improves the structural efficiency.

[0018] (2) Compared with the whole forging ring type transition force transmission section used in the tank bottom, the structural weight is reduced and the structural efficiency is improved.

[0019] (3) The present application adopts a plate combination design idea, the manufacturing process is only simple machining and sheet metal forming, after forming, the structures are connected by welding, the manufacturing cost is low, the manufacturing period is fast, in addition, the components of the present application are preferably made of stainless steel plate, which further improves the structural stiffness, reduces the processing cost, reduces the processing complexity and improves the processing efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a side view of the thrust ring and tank bottom combination structure in the embodiment of the present application;

[0021] Figure 2 is a top view of the thrust ring and tank bottom combination structure in the embodiment of the present application;

[0022] Figure 3 is an outer shaft side view of the thrust ring structure in the embodiment of the present application;

[0023] Figure 4 is an inner shaft side view of the thrust ring structure in the embodiment of the present application, except the base plate. DETAILED DESCRIPTION

[0024] The present application will be further described in detail below in combination with the drawings and specific embodiments:

[0025] As Figure 1As shown, the multi-branch diffusion engine bottom force transmission structure of the present application comprises a thrust ring 2, the bottom 1 of the tank is the rear bottom of the tank, and the thrust ring 2 is the main structure of the multi-branch diffusion engine thrust. As shown in Figure 2 As shown in Figure 1 As shown in Figures 2 to 4 As shown in Figure 3 As shown in Figure 4 As shown in

[0026] As shown in Figure 3 The thrust ring pad plate 3 is a flat plate structure with a central hole, the thrust ring outer ring 5 is a cylindrical structure with the upper end face and the lower end face both open, and the diameter of the upper end face is smaller than that of the lower end face, the thrust ring outer ring 5 is placed on the thrust ring pad plate 3, and the lower end face is connected with the thrust ring pad plate 3 through a plurality of thrust ring outer support angle pieces 4. In this embodiment, the plurality of thrust ring outer support angle pieces 4 are evenly arranged along the thrust ring outer ring 5 and the thrust ring pad plate 3. The thrust ring outer support angle piece 4 is a rectangular sheet structure, which is fillet welded at the joint of the thrust ring outer ring 5 and the thrust ring pad plate 3, and a part of which is connected with the thrust ring outer ring 5 and a part of which is connected with the thrust ring pad plate 3. The thrust ring outer ring 5 and the thrust ring pad plate 3 are connected through the thrust ring outer support angle piece 4, and the thrust transmitted from the thrust ring abutment surface 6 to the thrust ring outer ring 5 is diffused to the thrust ring pad plate 3 through the plurality of thrust ring outer support angle pieces 4.

[0027] The thrust ring abutment plate 6 is arranged on the upper end face of the thrust ring outer ring 5 and is a circular ring plate structure, which is provided with a threaded hole for connecting the engine frame through a bolt fastener; the thrust transmitted from the engine frame is transmitted to the thrust ring inner ring 7, the thrust ring inner support plate 9 and the thrust ring outer ring 5 through the thrust ring abutment surface 6.

[0028] As shown in Figure 3 The thrust ring inner ring 7 is a cylindrical structure with the upper end face and the lower end face both open, and the diameters of the upper end face and the lower end face are the same, which is a cylindrical structure. The thrust ring inner ring 7 is arranged in the cavity of the thrust ring outer ring 5, one end of which is attached to and welded with the thrust ring abutment plate 6, and the other end of which is attached to and welded with the thrust ring pad plate 3. The thrust transmitted from the thrust ring abutment surface 6 to the thrust ring inner ring 7 can be transmitted to the thrust ring pad plate 3.

[0029] As shown in Figure 4As shown, in order to show the thrust ring inner support plate 9, the thrust ring pad plate 3 is hidden, a plurality of thrust ring inner support plates 9 are arranged in the cavity formed by the outer wall surface of the thrust ring inner ring 7 and the inner wall surface of the thrust ring outer ring 5, and the thrust ring inner support plate 9 is connected with the outer wall surface of the thrust ring inner ring 7, the inner wall surface of the thrust ring outer ring 5 and the lower surface of the thrust ring butt joint plate 6, and plays a role of thrust transmission and structural reinforcement. In the embodiment, the plurality of thrust ring inner support plates 9 are arranged in a ring shape, each thrust ring inner support plate 9 has a same trapezoidal cross section, the upper base of the trapezoid is welded with the thrust ring butt joint plate 6, and the two waists are welded with the thrust ring outer ring 5 and the thrust ring inner ring 7 respectively. In addition, the plurality of thrust ring inner support plates 9 are densely arranged in the position along the engine thrust direction, that is, the arrangement spacing is smaller than that in the remaining positions, and the threaded holes provided on the thrust ring butt joint surface 6 need to be avoided during arrangement.

[0030] In the embodiment, the thickness of the thrust ring inner support plate 9 is 2-4 mm, and the thrust transmitted from the thrust ring butt joint surface 6 can be diffused to the thrust ring outer ring 5 and the thrust ring inner ring 7 through the thrust ring inner support plate 9, and then transmitted to the thrust ring pad plate 3.

[0031] As shown in the figure, Figure 3 The thrust ring outer ring 5 is welded by a plurality of skins, and the welds are reinforced by the thrust ring outer ring reinforcing plate 8 to improve the structural rigidity of the thrust ring outer ring 5.

[0032] In the embodiment, the opening inner diameter of the thrust ring pad plate 3 and the thrust ring butt joint plate 6 is the same as the inner diameter of the thrust ring inner ring 7. The materials of the thrust ring pad plate 3, the thrust ring outer support corner piece 4, the thrust ring outer ring 5, the thrust ring butt joint plate 6, the thrust ring inner ring 7, the thrust ring outer ring reinforcing plate 8 and the thrust ring inner support plate 9 are all stainless steel.

[0033] As shown in the figure, Figure 1 The thrust ring pad plate 3 is attached to and welded with the tank 1 bottom, so as to further diffuse the thrust diffused to the thrust ring pad plate 3 to the tank bottom main structure.

[0034] The present application eliminates the transition force transmission section between the rocket engine and the tank, adopts the structure of increasing the thrust ring on the outside of the ellipsoidal bottom of the stainless steel tank, connects the thrust ring and the tank bottom through multiple branches, diffuses the thrust transmitted by the engine frame to the tank bottom main structure through the thrust ring, eliminates the separate engine force transmission section structure, shortens the missile structure length, improves the space utilization rate and the structural efficiency.

[0035] The above is only the best specific embodiment of the present application, but the protection scope of the present application is not limited to this, any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

[0036] The description herein of any aspect of the application is not meant to be limiting of that aspect of the application. For example, features of one aspect of the application can be interchanged with features of another aspect of the application.

Claims

1. A multi-branch diffuser box bottom force transmission structure, characterized in that, The system includes a thrust ring pad (3), an outer thrust ring (5), a thrust ring mating plate (6), and an inner thrust ring (7). The thrust ring pad (3) is a flat plate structure with a central opening. The outer thrust ring (5) is a cylindrical structure with both its upper and lower ends open, and the inner diameter of the upper end is smaller than that of the lower end. The lower end of the outer thrust ring (5) is connected to the thrust ring pad (3). The thrust ring mating plate (6) is located on the upper end of the outer thrust ring (5) and is used to connect to the engine frame. The inner thrust ring (7) is a cylindrical structure with both its upper and lower ends open, and the inner diameters of the upper and lower ends are the same. The inner thrust ring (7) is located inside the cavity of the outer thrust ring (5), with one end connected to the thrust ring mating plate (6) and the other end connected to the thrust ring pad (3). The thrust ring pad (3) is connected to the bottom of the storage tank (1).

2. The multi-branch diffuser box bottom force transmission structure according to claim 1, characterized in that, It also includes thrust ring outer support corner pieces (4), the lower end face of the thrust ring outer ring (5) is connected to the thrust ring pad (3) through multiple thrust ring outer support corner pieces (4), and multiple thrust ring outer support corner pieces (4) are arranged circumferentially along the thrust ring outer ring (5) and the thrust ring pad (3).

3. The multi-branch diffuser box bottom force transmission structure according to claim 2, characterized in that, The outer support corner piece (4) of the thrust ring is welded to the joint between the outer ring (5) of the thrust ring and the thrust ring pad (3). Part of it is connected to the outer ring (5) of the thrust ring and part of it is connected to the thrust ring pad (3).

4. The multi-branch diffuser box bottom force transmission structure according to claim 1, characterized in that, It also includes multiple thrust ring inner support plates (9), which are set in the cavity formed by the outer wall of the inner ring (7) of the thrust ring and the inner wall of the outer ring (5) of the thrust ring. The thrust ring inner support plates (9) are connected to the outer wall of the inner ring (7), the inner wall of the outer ring (5) of the thrust ring, and the lower surface of the thrust ring docking plate (6), so as to play the role of thrust transmission and structural reinforcement.

5. The multi-branch diffuser box bottom force transmission structure according to claim 4, characterized in that, The multiple thrust ring inner support plates (9) are arranged in a circumferential direction. Each thrust ring inner support plate (9) has the same shape, which is a right trapezoid. The upper base of the trapezoid is welded to the thrust ring docking plate (6), and the two waists are welded to the outer ring (5) and the inner ring (7) of the thrust ring, respectively.

6. The multi-branch diffuser box bottom force transmission structure according to claim 4, characterized in that, The multiple thrust ring inner support plates (9) are densely arranged along the engine thrust direction, that is, the spacing between them is smaller than that at other positions.

7. The multi-branch diffuser box bottom force transmission structure according to claim 1, characterized in that, It also includes a thrust ring outer ring reinforcement plate (8), wherein the thrust ring outer ring (5) is obtained by welding multiple skins, and the weld seam is reinforced by the thrust ring outer ring reinforcement plate (8) to improve the structural rigidity.

8. The multi-branch diffuser box bottom force transmission structure according to claim 1, characterized in that, The inner diameter of the opening of the thrust ring pad (3) and the thrust ring mating plate (6) is the same as the inner diameter of the inner ring (7) of the thrust ring.

9. The multi-branch diffuser box bottom force transmission structure according to claim 4, characterized in that, The thrust ring pad (3), thrust ring outer ring (5), thrust ring mating plate (6), thrust ring inner ring (7), and thrust ring inner support plate (9) are all made of stainless steel.

10. The multi-branch diffuser box bottom force transmission structure according to claim 1, characterized in that, The thrust transmitted by the engine frame is transmitted through the thrust ring mating surface (6) to the inner ring (7), the inner support plate (9), the outer ring (5), and the thrust ring pad (3); the thrust ring pad (3) diffuses the thrust to the bottom of the storage tank (1).

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