Stringer structure on stainless steel rocket storage tank

Abstract

The utility model provides a stringer structure on a stainless steel rocket storage tank. The stringer structure at least comprises a stringer base body, an adapter plate and a connecting plate. The cross section of the stringer base body is a regular isosceles trapezoid with an opening in the long side, and the adapter plate and the connecting plate are sequentially arranged at the opening end of the stringer base body to form an outer edge. One end of one face of the adapter plate is connected with the opening end of the stringer base body, the other face of the adapter plate is connected with the connecting plate, and the face, away from the adapter plate, of the connecting plate is used for being connected with a skin; the thickness of the connecting plate ranges from 0.4 mm to 0.8 mm.

Description

Technical Field

[0001] This utility model relates to the field of aerospace launch vehicle technology, and in particular to a stringer structure for a stainless steel rocket tank. Background Technology

[0002] In the existing manufacturing process of large-diameter stainless steel rocket propellant tanks, numerous internal stringers need to be welded onto the tank to support the short cylinder and withstand axial pressure. Due to manufacturing limitations, these internal stringers are typically formed by bending a single sheet of material. Consequently, they usually have thick flanges, which increases the tank's weight, makes welding difficult, and leads to stress concentration in the welds. In low-temperature environments, the imbalance of stress concentration weakens the stress strength of the corresponding thickness of the skin layer. The skin layer with stress concentration will yield first, and once delamination occurs along the thickness direction, the elongation of the skin will decrease rapidly.

[0003] In order to eliminate the adverse effects of stress concentration on the skin, there is an urgent need to provide a stringer structure that is easy to weld, has little impact on the skin, and can be reliably connected to the skin. Utility Model Content

[0004] To solve the above-mentioned technical problems, this utility model proposes a stringer structure for a stainless steel rocket propellant tank, which can effectively prevent skin cracking.

[0005] This utility model provides a stringer structure for a stainless steel rocket propellant tank, comprising at least a stringer base, a transition plate, and a connecting plate; the cross-section of the stringer base is an isosceles trapezoid with an open long side, and the transition plate and the connecting plate are sequentially arranged at the open end of the stringer base to form an outer edge; one end of one side of the transition plate is connected to the open end of the stringer base, and the other side is connected to the connecting plate, and the side of the connecting plate away from the transition plate is used to connect the skin; the thickness of the connecting plate ranges from 0.4 to 0.8 mm.

[0006] In one embodiment, the stringer base has a plurality of weight-reducing holes in its longitudinal direction, and the weight-reducing holes are equidistantly distributed.

[0007] In one embodiment, the weight-reducing hole is circular or elliptical.

[0008] In one embodiment, the connecting plate has longitudinally distributed anti-crack grooves on one side for connecting with the adapter plate, and the adapter plate has an array of welding through holes at positions corresponding to the anti-crack grooves; the adapter plate and the connecting plate are welded together through the welding through holes.

[0009] In one embodiment, at least two anti-crack grooves are arranged side by side.

[0010] In one embodiment, the thickness of the stringer base is greater than the thickness of the transition plate, which in turn is greater than the thickness of the connecting plate.

[0011] In one embodiment, the thickness of the stringer base ranges from 1 to 3 mm.

[0012] In one embodiment, the thickness of the adapter plate ranges from 0.8 to 1.2 mm.

[0013] In one embodiment, the connecting plate and the adapter plate have the same shape and size.

[0014] In one embodiment, the adapter plate is connected to the stringer base by laser corner welding or laser butt welding; the adapter plate is connected to the connecting plate by laser lap welding or resistance spot welding.

[0015] This invention provides a stringer structure for a stainless steel rocket propellant tank. The optimized stringer structure utilizes the elongation of the connecting plates to distribute axial forces, reducing the impact on the skin and significantly lowering the risk of skin cracking. Simultaneously, when the stringer structure is subjected to excessive longitudinal force (axial force), it will break off at the anti-cracking groove, thereby reducing the impact of axial force on the skin and effectively preventing skin cracking.

[0016] Upon reading the detailed embodiments and examining the accompanying drawings, those skilled in the art will recognize additional features and advantages. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a cross-sectional schematic diagram of the stringer structure according to an embodiment of the present invention.

[0019] Figure 2 This is a partial enlarged view of the positions of the adapter plate and the connecting plate in an embodiment of this utility model.

[0020] Figure 3 This is a top view of the truss structure according to an embodiment of the present utility model. Detailed Implementation

[0021] The features and exemplary embodiments of various aspects of this utility model will be described in detail below. To make the objectives, technical solutions, and advantages of this utility model clearer, the following detailed description is provided in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only configured to explain this utility model and to exemplarily illustrate the principles of this utility model, and are not configured to limit this utility model. In addition, the structural components in the drawings are not necessarily drawn to scale. For example, the dimensions of some structural components or regions in the drawings may be enlarged for other structural components or regions to aid in the understanding of the embodiments of this utility model.

[0022] The directional terms used in the following description refer to the directions shown in the figures and are not intended to limit the specific structure of the embodiments of this utility model. In the description of this utility model, it should be noted that, unless otherwise stated, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0023] Furthermore, the terms "comprising," "including," "having," or any other variations thereof are intended to cover non-exclusive inclusion, such that a structure or component that includes a list of elements includes not only those elements but also other structural elements that are not expressly listed or inherent to the structure or component. Without further limitations, an element defined by the phrase "comprising..." does not exclude the presence of other identical elements in the article or apparatus that includes the element.

[0024] Spatial relation terms such as "below," "under," "under," "low," "above," "on," and "high" are used for descriptive convenience to explain the positioning of one element relative to a second element, indicating that these terms are intended to cover different orientations of the device, in addition to those different from those shown in the figure. Furthermore, phrases such as "one element on / below another element" can indicate that two elements are in direct contact, or that there are other elements between the two elements. In addition, terms such as "first" and "second" are also used to describe individual elements, areas, parts, etc., and should not be considered limiting. Similar terms are used throughout the description to refer to similar elements.

[0025] For those skilled in the art, this invention can be implemented without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the invention by illustrating examples.

[0026] See also Figure 1 , Figure 2 and Figure 3 This utility model provides a stringer structure for a stainless steel rocket propellant tank, comprising at least a stringer base 1, a transition plate 2, and a connecting plate 3. The stringer base 1, as the main body of the stringer structure, serves to support the short cylinder and withstand axial pressure. The cross-section of the stringer base 1 is a regular isosceles trapezoid with its long side open, which can be understood as... Figure 1 The bottom of the truss base 1 is open. A transition plate 2 and a connecting plate 3 are sequentially arranged at the open end of the truss base 1 to form an outer edge A. The truss base 1 is connected to the skin via this outer edge A. One end of the transition plate 2 is connected to the open end of the truss base 1, and the other end is connected to the connecting plate 3. The side of the connecting plate 3 away from the transition plate 2 is used to connect to the skin. To ensure good ductility of the connecting plate, the thickness of the connecting plate in this embodiment ranges from 0.4 to 0.8 mm.

[0027] For the lap joint structure of the stringer structure and the short cylindrical skin, the weld has a significant impact on the lower skin layer in low-temperature environments. Low temperatures amplify the disruptive effect of stress concentration on the stress balance of the skin. The imbalance of stress concentration weakens the stress strength of the corresponding thickness of the skin layer. The skin layer with stress concentration will yield first. Once a difference in delamination occurs in the thickness direction, the elongation of the skin will decrease rapidly, making it very easy for the skin to crack. The stringer structure of this utility model embodiment can eliminate the adverse effects caused by stress concentration. Moreover, after the stringer structure and the skin are welded, the extremely high elongation of the connecting plate reduces the impact of low-temperature environments on the skin performance, thereby greatly reducing the risk of inducing skin cracking.

[0028] Furthermore, in order to ensure that the connecting plate has sufficient elongation, the connecting plate in this embodiment can be made of a material with lower strength.

[0029] like Figure 3 As shown, in one embodiment, to reduce the weight of the stringer base 1, multiple weight-reducing holes 11 can be provided longitudinally in the stringer base 1, with each weight-reducing hole 11 being equidistantly distributed. When manufacturing the stringer base of this embodiment, the weight-reducing holes 11 can be cut using laser cutting, and then bent into shape. Figure 2 The shape in the middle.

[0030] Furthermore, the weight-reducing hole 11 in the above embodiments can be circular or elliptical.

[0031] See also Figure 1 , Figure 2 and Figure 3To further reduce the risk of skin cracking, longitudinally distributed anti-crack grooves 31 can be provided on the side of the connecting plate 3 used to connect with the adapter plate 2. The anti-crack grooves 31 can be formed by laser engraving. To provide a welding channel for welding the adapter plate 2 and the connecting plate 3, and to prevent the weld from covering the anti-crack grooves during the welding process, this embodiment provides an array of welding through holes 21 at the positions corresponding to the anti-crack grooves 31 on the adapter plate 2, thereby preventing the anti-crack grooves 31 from being covered. It should be noted that the welding through holes 21 only serve as channels for the welding equipment to pass through. The adapter plate 2 and the connecting plate 3 are welded to each other through the welding through holes 21, thereby ensuring that the anti-crack grooves 31 are not affected by the welding position. When the stringer structure of this embodiment is subjected to excessive longitudinal (cylindrical axial) force, the connecting plate 3 will crack or even break from the laser-engraved anti-crack grooves 31, so that the axial force will not affect the skin, greatly reducing the risk of skin cracking.

[0032] Furthermore, in the above embodiments, at least two anti-crack grooves 31 are arranged side by side, with a certain distance between each anti-crack groove 31.

[0033] This embodiment reduces the welding difficulty between the adapter plate and the connecting plate by setting welding through holes at the positions corresponding to the anti-crack grooves on the adapter plate, increases welding reliability, and achieves further weight reduction of the stringer structure.

[0034] See Figure 2 In any of the above embodiments, the thickness of the stringer base 1 is greater than the thickness of the transition plate 2, which is greater than the thickness of the connecting plate 3. The stringer base, as the main load-bearing structure, is the thickest of the three, ranging from 1 to 3 mm. The thickness of the transition plate is between the other two, ranging from 0.8 to 1.2 mm. The connecting plate, being directly connected to the skin, is the thinnest, ranging from 0.4 to 0.8 mm.

[0035] In the above embodiments, the adapter plate 2 is connected to the stringer base by laser corner welding or laser butt welding. The adapter plate 2 is connected to the connecting plate 3 by lap welding, which can be achieved by laser lap welding or resistance spot welding.

[0036] In any of the above embodiments, the adapter plate 2 and the connecting plate 3 have the same outer contour length, width, shape and size, except for the difference in thickness.

[0037] The stringer structure of this utility model embodiment can be welded to the skin using a galvanometer welding method to prevent the welding process of the stringers from affecting the skin, while ensuring a reliable connection between the stringers and the skin.

[0038] The above embodiments can be combined with each other and have corresponding technical effects.

[0039] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A stringer structure on a stainless steel rocket tank, characterized by, At least including a stringer base, an adapter plate and a connecting plate; the cross section of the stringer base is a right isosceles trapezoid with open long side, the adapter plate and the connecting plate are arranged in sequence at the open end of the stringer base to form an outer edge; One end of one side of the adapter plate is connected with the open end of the stringer base, the other side is connected with the connecting plate, the side of the connecting plate away from the adapter plate is used for connecting the skin; The thickness of the connecting plate ranges from 0.4 to 0.8 mm.

2. The stringer structure of claim 1, wherein A plurality of lightening holes are longitudinally arranged on the stringer base, and each of the lightening holes is equidistantly distributed.

3. The stringer structure of claim 2, wherein, The lightening hole is circular or elliptical.

4. The stringer structure of claim 1, wherein, The side of the connecting plate used for connecting with the adapter plate is provided with a longitudinal anti-cracking groove, the adapter plate is provided with an array of welding through holes at the position corresponding to the anti-cracking groove; the adapter plate and the connecting plate are welded and connected with each other through the welding through holes.

5. The stringer structure of claim 4, wherein, At least two anti-cracking grooves are arranged side by side.

6. The stringer structure of claim 1, wherein, The thickness of the stringer base > the thickness of the adapter plate > the thickness of the connecting plate.

7. The stringer structure of claim 6, wherein, The thickness of the stringer base ranges from 1 to 3 mm.

8. The stringer structure of claim 7, wherein, The thickness of the adapter plate ranges from 0.8 to 1.2 mm.

9. The stringer structure according to any one of claims 1 to 8, characterized in that The connecting plate and the adapter plate are the same in shape and size.

10. The stringer structure of claim 9, wherein, The adapter plate and the stringer base are connected by laser angle welding or laser butt welding; the adapter plate and the connecting plate are connected by laser lap welding or resistance spot welding.

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