Segmented radial clamping key connecting structure for solid rocket engine

Abstract

The invention discloses a segmented radial clamping key connecting structure for a solid rocket engine. The segmented radial clamping key connecting structure comprises segmented clamping keys, an outer shell, an inner shell and a clamping key fixing structure. The segmented clamping keys fix the outer shell to the inner shell through a clamping key fixing structure so that the inner shell and the outer shell of the solid rocket engine can be connected. Through segmented radial installation design of the clamping keys and limiting filling type fixing of the limiting blocks, the fixing blocks and the fixing screws, axial connection of the inner shell and the outer shell of the engine in the limited space is achieved, and the problems that an integral clamping key is difficult to install in the limited space, and bearing is insufficient, stress is uneven and the service life is short due to the fact that an opening exists in an opening clamping key are solved. A traditional clamping key connection structure is difficult to further miniaturize and easy to interfere, and the overall performance of the engine connection structure is improved.

Description

Technical Field

[0001] This invention belongs to the field of solid rocket motor structural design technology, and particularly relates to a segmented radial keyway connection structure for solid rocket motors. Background Technology

[0002] Conventional solid rocket motor connection structures include keyways, retaining rings, threads, flanges, etc. For structures such as the combustion chamber shell of small and medium-sized solid rocket motors, keyway connections are often preferred due to space constraints. Traditional radially mounted keyway structures are difficult to install, have circumferential weak areas, are prone to interference, and are difficult to achieve lightweight design within a limited space. This is not conducive to further miniaturization of connection structures for small and medium-sized engines, thus limiting the overall performance of engine connection structures. Summary of the Invention

[0003] The technical problem solved by this invention is to overcome the shortcomings of the prior art and provide a segmented radial key connection structure for solid rocket engines, which aims to solve the problems of difficulty in miniaturizing radial keys in a limited space, invariable installation, easy structural interference, and uneven stress.

[0004] To address the aforementioned technical problems, this invention discloses a segmented radial keyed connection structure for a solid rocket motor, comprising: segmented keyed connectors, an outer shell, an inner shell, and a keyed fixing structure; wherein, the segmented keyed connectors fix the outer shell to the inner shell through the keyed fixing structure, thereby achieving the connection between the inner and outer shells of the solid rocket motor.

[0005] In the above-mentioned segmented radial keyed connection structure for solid rocket motor, the inner side of the outer shell has a groove A and the outer side of the inner shell has a groove B; groove A and groove B form a key groove for accommodating the segmented key and the key fixing structure.

[0006] In the above-mentioned segmented radial keyway connection structure for solid rocket motors, a T-shaped notch is provided on the outer shell; the side of the T-shaped notch near the keyway groove is an elongated window, and the side away from the keyway groove is a groove C; wherein, the elongated window is a through hole.

[0007] In the above-mentioned segmented radial keyway connection structure for solid rocket motors, the segmented keys are sequentially installed and embedded in the keyway groove along the elongated window.

[0008] In the above-mentioned segmented radial keyed connection structure for solid rocket motors, the keyed fixing structure includes: a limiting block, a fixing block, and a fixing screw;

[0009] The limiting block is installed and limited through the long strip window; one limiting block is installed at each end of the long strip window;

[0010] The fixing block is located between the two limiting blocks and is fixed to the outer shell by fixing screws.

[0011] In the above-mentioned segmented radial keyway connection structure for solid rocket motors, the limiting block adopts an L-shaped design; the limiting surface of the limiting block is radially fitted with the opening surface of the elongated window to achieve limiting; the limiting block is embedded in the keyway groove and has the same pressure-bearing size as the segmented keyway; the outer circular surface of the limiting block is flush with the outer shell.

[0012] In the above-mentioned segmented radial keyway connection structure for solid rocket motors, the fixing block adopts an L-shaped design with its outer circular surface flush with the outer shell; the short side of the fixing block is installed and embedded in the keyway groove through a long strip window; the structure of the short side of the fixing block located in the keyway groove is consistent with the bearing size of the segmented keyway, and the circumferential direction, together with the segmented keyway and the limiting block, forms a complete circle to achieve full circumferential bearing; the long side of the fixing block is embedded in the groove C.

[0013] In the above-mentioned segmented radial keyway connection structure for solid rocket motors, a countersunk hole is provided on the long side of the fixing block, and a threaded through hole matching the position of the countersunk hole is provided in the groove C; the fixing screw fixes the fixing block to the outer shell through the threaded through hole and the countersunk hole.

[0014] In the above-mentioned segmented radial keyed connection structure for solid rocket motors, let: the number of segmented keys be n, the circumferential angle of each segmented key be α1; the circumferential angle of the limiting block be α2; the circumferential angle of the fixing block be α3; after all segmented keys, limiting blocks, and fixing blocks are installed in place, the total circumferential angle of the gaps between each segmented key, between a segmented key and a limiting block, and between a limiting block and a fixing block is Δ; then we have:

[0015]

[0016] Δ≥2π-(n*α1+2α2+α3)

[0017] Where α4 represents the circumferential angle of the elongated window. This indicates rounding up to the nearest integer.

[0018] In the segmented radial keyed connection structure for the solid rocket motor described above, α4≥α1.

[0019] The present invention has the following advantages:

[0020] (1) This invention discloses a segmented radial key connection structure for a solid rocket engine. Through the segmented radial installation design of the key, the limiting block, fixing block, and fixing screw limit filling fixation realizes the axial connection of the inner and outer shells of the engine in a limited space. This solves the problems of the difficulty of installing integral key in a limited space, the insufficient load-bearing capacity and uneven force due to the opening of the key, the difficulty of further miniaturizing the traditional key connection structure, and the easy interference of the structure. This improves the overall performance of the engine connection structure.

[0021] (2) This invention discloses a segmented radial key connection structure for a solid rocket engine. By radially dividing the key and opening the outer shell, the radial installation of each segment key can be convenient.

[0022] (3) This invention discloses a segmented radial key connection structure for solid rocket engines. By segmenting key limit and combining key fixing structure design, it solves the problems of uneven load bearing and local stress concentration in the existing radial key design results, and realizes radial uniform load bearing.

[0023] (4) This invention discloses a segmented radial key connection structure for solid rocket engines. Through the miniaturized design of segmented key limiting and key fixing structure, it solves the problems of difficulty in miniaturizing radial key in limited space, invariable installation, and easy interference of structure. Attached Figure Description

[0024] Figure 1 This is a front view of a segmented radial keyway connection structure for a solid rocket motor according to an embodiment of the present invention;

[0025] Figure 2 This is a left view of a segmented radial keyway connection structure for a solid rocket motor according to an embodiment of the present invention;

[0026] Figure 3 This is a schematic diagram of the structure of a limiting block in an embodiment of the present invention;

[0027] Figure 4 This is a schematic diagram of the structure of a fixing block in an embodiment of the present invention;

[0028] Figure 5 This is a schematic diagram of the structure of an outer shell in an embodiment of the present invention. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments disclosed in the present invention will be described in further detail below with reference to the accompanying drawings.

[0030] Reference Figures 1-2 In this embodiment, the solid rocket motor uses a segmented radial keyed connection structure, including: segmented key 1, outer shell 5, inner shell 6, and keyed fixing structure. The segmented key 1 fixes the outer shell 5 to the inner shell 6 via the keyed fixing structure, thereby achieving the connection between the inner and outer shells of the solid rocket motor.

[0031] In this embodiment, the inner side of the outer shell 5 has a groove A and the outer side of the inner shell 6 has a groove B; the groove A and the groove B form a key groove 101 for accommodating the segmented key 1 and the key fixing structure.

[0032] In this embodiment, as Figure 5As shown, the outer casing 5 is provided with a T-shaped notch 502; the side of the T-shaped notch 502 closest to the keyway 101 is a long strip window 5021, and the side away from the keyway 101 is a groove C5022. Among them, the long strip window 5021 is a through hole.

[0033] In this embodiment, the segmented key 1 adopts a segmented structure design, which divides the traditional radially mounted key into equal parts. Each segmented key 1 is sequentially installed and embedded in the key slot 101 along the elongated window 5021.

[0034] In this embodiment, as Figure 2 As shown, the key fixing structure includes, but is not limited to, a limiting block 2, a fixing block 3, and a fixing screw 4. The limiting block 2 is installed and limited through the elongated window 5021; one limiting block 2 is installed at each end of the elongated window 5021. The fixing block 3 is located between the two limiting blocks 2 and is fixed to the outer casing 5 by the fixing screw 4.

[0035] Preferred, such as Figure 3 As shown, the limiting block 2 adopts an L-shaped design; the limiting surface 201 of the limiting block 2 is radially fitted with the opening surface 501 of the elongated window 5021 to achieve limiting; the limiting block 2 is embedded in the keyway 101 and has the same bearing size as the segmented keyway 1; the outer circular surface of the limiting block 2 is flush with the outer shell 5.

[0036] Preferred, such as Figure 4 As shown, the fixing block 3 adopts an L-shaped design, with its outer circular surface flush with the outer shell 5. The short side of the fixing block 3 is installed and embedded in the keyway 101 through the elongated window 5021. The structure of the short side of the fixing block 3 within the keyway 101 is consistent with the bearing size of the segmented key 1, forming a complete circle with the segmented key 1 and the limiting block 2 in the circumferential direction to achieve full circumferential bearing. The long side of the fixing block 3 is embedded in the groove C5022. Furthermore, a countersunk hole 301 is provided on the long side of the fixing block 3, and a threaded through hole matching the position of the countersunk hole 301 is provided in the groove C5022. The fixing screw 4 fixes the fixing block 3 to the outer shell 5 through the threaded through hole and the countersunk hole 301.

[0037] In this embodiment, let: the number of segmented key 1 is n, the circumferential angle of each segmented key 1 is α1; the circumferential angle of the limiting block 2 is α2; the circumferential angle of the fixing block 3 is α3; after each segmented key 1, limiting block 2, and fixing block 3 is installed in place, the total circumferential angle of the gaps between each segmented key 1, between each segmented key 1 and the limiting block 2, and between the limiting block 2 and the fixing block 3 is Δ; then:

[0038]

[0039] Δ≥2π-(n*α1+2α2+α3)

[0040] Where α4 represents the circumferential angle of the elongated window 5021, α4≥α1, This indicates rounding up to the nearest integer.

[0041] It should be noted that, under the premise of meeting the load-bearing design requirements of segmented keyway connections, even when the circumferential angle of the α4 opening is limited for small and medium-sized keyway connection structures (generally, the circumferential angle accounts for no more than 10%), the keyway can still be installed after being divided into n equal parts, and the overall axial load-bearing capacity is not affected by the size of α4. Furthermore, the smaller the value of Δ, the more compact the overall structure, and the higher the overall load-bearing capacity of the segmented radial keyway connection structure for this solid rocket motor. Further, considering the use of a beveled design for the elongated window 5021, the restriction of α4≥α1 can be relaxed to achieve beveled installation of the segmented keyway, thereby increasing the length of the segmented keyway and reducing the number of keyway segments.

[0042] By constraining the parameters mentioned above, the installability of the segmented key is improved.

[0043] In this embodiment, the segmented key can be made of ultra-high strength steel; the width between each segmented key is 0 to 0.2 mm.

[0044] In this embodiment, the limiting block can be made of the same material as the segmented key.

[0045] In this embodiment, the fixing block can be made of the same material as the segmented key. The fixing block, together with the segmented key and the limiting block, forms a complete circle to achieve full circumferential load-bearing. After installation, the fixing block and the limiting block maintain a circumferential gap of approximately 0-0.2 mm. The long side of the fixing block is embedded in the groove C, with a thickness of approximately 1 mm and a length of 5-8 mm, and is provided with countersunk holes for fixing, meeting the installation requirements of small countersunk screws of approximately M2-M3.

[0046] In this embodiment, the groove depth of groove C matches the thickness of the long side of the fixing block, approximately 1 mm; an M2 to M3 threaded through hole is provided inside the groove of groove C.

[0047] In this embodiment, the fixing screw can be a countersunk screw of approximately M2 to M3 size. The screw material can be stainless steel or high-strength steel.

[0048] Based on the above embodiments, the following is an explanation with reference to a specific example.

[0049] In this embodiment, the solid rocket motor uses a segmented radial keyed connection structure, including: segmented keyed sections 1, an outer shell 5, an inner shell 6, and a keyed fixing structure. Specifically:

[0050] The segmented key 1 adopts a segmented structure and is made of ultra-high strength steel. The traditional radial mounting key is divided into 14 segments. The cross-sectional dimensions of each segment key are 2mm × 2.4mm. Each segment key is sequentially embedded into the key groove 101 formed by the outer shell 5 and the inner shell 6 along the elongated window 5021 of the outer shell 5. After installation, the width between each segment key is controlled within the range of 0 to 0.2mm.

[0051] The limiting block 2 and the segmented key 1 are made of the same material or ultra-high strength steel; the limiting block 2 adopts an L-shaped design, and its limiting surface 201 and the window surface 501 are radially fitted to achieve limiting, with the fitting surface size being 1.5mm×2.4mm; the limiting block 2 is embedded in the key groove 101 and has the same bearing size as the segmented key 1, with a cross-sectional size of 2mm×2.4mm; the outer circular surface of the limiting block 2 is flush with the outer shell 5.

[0052] The fixing block 3 and the segmented key 1 are made of the same material or ultra-high strength steel and adopt an L-shaped design. They are installed in the keyway groove 101 through the elongated window of the outer shell 5, located between the two limiting blocks 2. The structure of the short side of the fixing block 3 within the keyway groove 101 is consistent with the bearing size of the segmented key 1, with a cross-sectional size of 2mm × 2.4mm. The fixing block 3, together with the segmented key 1 and the limiting block 2, forms a complete circle to achieve full circumferential bearing. After installation, the fixing block and the limiting block maintain a circumferential gap of 0-0.2mm. The long side of the fixing block 3 is embedded in the groove C, with a fitting size of 5mm × 6mm and a flange thickness of 0.8mm. It is provided with a countersunk hole 301 for fixing to meet the installation requirements of M2 small countersunk screws. The outer circular surface of the fixing block 3 is flush with the outer shell 5.

[0053] The outer casing 5 is provided with a T-shaped notch 502; the side of the T-shaped notch 502 closest to the key slot 101 is a long strip window 5021, and the side away from the key slot 101 is a groove C 5022; the long strip window 5021 is a through hole with a size of 2mm×2.5mm, which facilitates the installation and fixation of the segmented key 1 and the limiting block 2; the groove C has a groove depth that matches the long side of the fixing block 3, and a size of 5mm×6mm×0.8mm; an M2 threaded through hole is provided in the groove C, and its position matches the countersunk hole 301 of the fixing block 3.

[0054] The fixing screw 4 is a customized miniaturized M2 countersunk screw, which fixes the fixing block 3 to the outer shell 5 through the threaded through hole and the countersunk hole 301. The fixing screw 4 is made of stainless steel or high-strength steel, and after installation, the outer surface of the fixing screw does not protrude from the outer surface of the outer shell.

[0055] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make possible changes and modifications to the technical solutions of the present invention by utilizing the methods and techniques disclosed above without departing from the spirit and scope of the present invention. Therefore, any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solutions of the present invention shall fall within the protection scope of the technical solutions of the present invention.

[0056] The contents not described in detail in this specification are common knowledge to those skilled in the art.

Claims

1. A segmented radial keyway connection structure for a solid rocket motor, characterized in that, include: The components include a segmented key (1), an outer shell (5), an inner shell (6), and a key fixing structure; wherein the segmented key (1) fixes the outer shell (5) to the inner shell (6) through the key fixing structure to achieve the connection between the inner and outer shells of the solid rocket engine.

2. The segmented radial keyway connection structure for a solid rocket motor according to claim 1, characterized in that, The inner side of the outer shell (5) has a groove A, and the outer side of the inner shell (6) has a groove B; the groove A and the groove B form a key groove (101) for accommodating the segmented key (1) and the key fixing structure.

3. The segmented radial keyway connection structure for a solid rocket motor according to claim 2, characterized in that, The outer casing (5) is provided with a T-shaped notch (502); the side of the T-shaped notch (502) near the keyway (101) is a long strip window (5021), and the side away from the keyway (101) is a groove C (5022); wherein, the long strip window (5021) is a through hole.

4. The segmented radial keyway connection structure for a solid rocket motor according to claim 3, characterized in that, The segmented key (1) is installed and embedded in the key slot (101) along the long strip window (5021).

5. The segmented radial keyway connection structure for a solid rocket motor according to claim 3, characterized in that, The key fixing structure includes: a limiting block (2), a fixing block (3), and a fixing screw (4); The limiting block (2) is installed and limited through the elongated window (5021); one limiting block (2) is installed at each end of the elongated window (5021); The fixing block (3) is located between the two limiting blocks (2) and is fixed to the outer shell (5) by fixing screws (4).

6. The segmented radial keyway connection structure for a solid rocket motor according to claim 5, characterized in that, The limiting block (2) adopts an L-shaped design; the limiting surface (201) of the limiting block (2) is radially fitted with the opening surface (501) of the long strip window (5021) to achieve limiting; the limiting block (2) is embedded in the keyway (101) and has the same pressure bearing size as the segmented keyway (1); the outer circular surface of the limiting block (2) is flush with the outer shell (5).

7. The segmented radial keyway connection structure for a solid rocket motor according to claim 5, characterized in that, The fixing block (3) adopts an L-shaped design, with its outer circular surface flush with the outer shell (5); the short side of the fixing block (3) is installed and embedded in the keyway (101) through the elongated window (5021); the structure of the short side of the fixing block (3) located in the keyway (101) is consistent with the pressure bearing size of the segmented keyway (1), and the circumferential direction forms a whole circle with the segmented keyway (1) and the limiting block (2) to achieve full circumferential bearing; the long side of the fixing block (3) is embedded in the groove C (5022).

8. The segmented radial keyway connection structure for a solid rocket motor according to claim 7, characterized in that, The long side of the fixing block (3) is provided with a countersunk hole (301), and the groove C (5022) is provided with a threaded through hole that matches the position of the countersunk hole (301); the fixing screw (4) fixes the fixing block (3) to the outer shell (5) through the threaded through hole and the countersunk hole (301).

9. The segmented radial keyway connection structure for a solid rocket motor according to claim 5, characterized in that: The number of segmented key (1) is n, and the circumferential angle of each segmented key (1) is α1; the circumferential angle of the limiting block (2) is α2; the circumferential angle of the fixing block (3) is α3; after each segmented key (1), limiting block (2), and fixing block (3) is installed in place, the total circumferential angle of the gap between each segmented key (1), between the segmented key (1) and the limiting block (2), and between the limiting block (2) and the fixing block (3) is Δ; then: Δ≥2π-(n*α1+2α2+α3) Where α4 represents the circumferential angle of the elongated window (5021), This indicates rounding up to the nearest integer.

10. The segmented radial keyway connection structure for a solid rocket motor according to claim 9, characterized in that, α4≥α1。

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