Snap ring connection structure and solid rocket motor

Abstract

The embodiment of the present application provides a snap ring connection structure and a solid rocket engine. In the snap ring connection structure, a plurality of snap ring blocks are hinged to form a snap ring chain, the number of snap ring chains is equal to the number of fixed blocks, one end of each fixed block is hinged to the snap ring block at one end of an adjacent snap ring chain, and the other end of the solid block is hinged to the snap ring block at one end of another adjacent snap ring chain, forming an annular rigid snap ring connection structure. During the installation process of the snap ring connection structure being connected to the slot of the inner circumferential wall of the rear joint of the solid rocket engine, a single snap ring block is installed into the slot, and adjacent snap ring blocks are hinged to form a snap ring chain. Along the circumferential direction of the inner circumferential wall of the rear joint of the solid rocket engine, the two ends of the fixed block are respectively hinged to the snap ring blocks of the adjacent snap ring chain, forming an annular rigid snap ring connection structure. During the installation process of the snap ring connection structure, no special hydraulic auxiliary tooling is required for clamping, and it is easy to install, and it does not need to be prefabricated on the nozzle in advance before installation, thereby improving installation efficiency.

Description

Technical Field

[0001] The present application relates to the technical field of solid rocket engines, and more specifically, to a clamping ring connection structure and a solid rocket engine. Background Art

[0002] Solid rocket engines are composed of multiple parts, which are usually connected by connecting structures. Traditional connecting structures are mostly flange structures, but the overall weight of the flange structure is heavy, which is not conducive to improving the carrying capacity of the launch vehicle. In the process of lightweight structure development, the snap ring connection structure began to be used. However, the snap ring connection structures currently used are all rigid parts, which makes the installation of the snap ring connection structure difficult and has poor process adaptability. Summary of the invention

[0003] In view of the shortcomings of the existing methods, the present application proposes a clamping ring connection structure and a solid rocket engine to solve the technical problems in the prior art that the clamping ring connection structures are all rigid parts, resulting in great difficulty in installation of the clamping ring connection structures and poor process adaptability.

[0004] In a first aspect, an embodiment of the present application provides a clasp connection structure, comprising: at least one clasp chain and at least one fixing block; the clasp chain comprises at least two hinged clasp blocks;

[0005] When the clasp chain and the fixing block are both one, the two ends of the fixing block are respectively hinged to the clasp blocks at the two ends of the clasp chain to form an annular rigid clasp connection structure;

[0006] When there are more than two clasp chains and two fixing blocks, one end of the fixing block is hinged to the clasp block at one end of one clasp chain, and the other end of the fixing block is hinged to the clasp block at the other end of the adjacent clasp chain to form an annular rigid clasp connection structure;

[0007] The snap ring connection structure is constructed to be at least partially snapped into a snap groove on the inner peripheral wall of the rear joint of the solid rocket motor.

[0008] Optionally, the snap ring block includes a base portion and at least one raised portion;

[0009] In the radial plane of the clamping ring connection structure, the base portion is an annular segment, including an inner ring portion and an outer ring portion, and the protrusion is arranged on the inner ring portion;

[0010] In the axial plane of the clamping ring connection structure, the protrusion and the base portion are at a designed angle;

[0011] The outer ring portion is constructed to be clamped in the clamping groove of the inner circumferential wall of the rear joint along the radial direction of the clamping ring connection structure, and the inner ring portion is constructed to contact or abut against the fixed body of the solid rocket engine; the protrusion is constructed to contact or abut against the inner wall of the rear joint along the radial direction.

[0012] Optionally, along the circumference of the snap ring connection structure, the outer ring parts of any two adjacent snap ring blocks abut against each other, and the two ends of the inner ring part of the snap ring block respectively include a first connecting part and a second connecting part; the first connecting part and the second connecting part are respectively provided with a first through hole and a second through hole;

[0013] The first through hole of the first connecting portion of one of the snap ring blocks is connected to the second through hole of the second connecting portion of another adjacent snap ring block along the axial direction and are hinged via a pin shaft.

[0014] Optionally, in an axial plane of the clamping ring connection structure, the protrusion is perpendicular to the base portion.

[0015] Optionally, along the radial direction of the clamping ring connection structure, the side of the inner ring portion away from the outer ring portion and the side of the raised portion away from the outer ring portion are located on the same pitch circle; in the axial plane of the clamping ring connection structure, the cross-sectional shape of the raised portion and the base portion includes an L-shape.

[0016] Optionally, the fixing block includes a first portion and a second portion, and in an axial plane of the clamping ring connection structure, the first portion is perpendicular to the second portion, and the cross-sectional shape of the first portion and the second portion includes an L-shape.

[0017] Optionally, along the radial direction of the clamping ring connection structure, the side of the first portion away from the second portion is located on the same pitch circle as the side of the inner ring portion away from the outer ring portion, and the side of the second portion away from the first portion is located on the same pitch circle as the side of the outer ring portion away from the inner ring portion.

[0018] Optionally, both ends of the first part of the fixing block include a third connecting part and a fourth connecting part respectively, and the third connecting part and the fourth connecting part are respectively provided with a third through hole and a fourth through hole;

[0019] Along the circumferential direction of the snap ring connection structure, two ends of the second portion of the fixing block are respectively in contact with two adjacent snap ring blocks;

[0020] The third through hole of the third connecting part of the fixed block is connected to the first through hole of the first connecting part of an adjacent retaining ring block along the axial direction and are hinged by a pin; the fourth through hole of the fourth connecting part of the fixed block is connected to the second through hole of the second connecting part of another adjacent retaining ring block along the axial direction and are hinged by a pin.

[0021] In a second aspect, an embodiment of the present application provides a solid rocket engine, comprising: a rear joint, a fixed body, a nozzle expansion section, and any one of the clamping ring connection structures described in the first aspect above;

[0022] Along the radial direction of the snap ring connection structure, the snap ring connection structure is at least partially snapped into the snap groove of the inner peripheral wall of the rear joint, and the first surface of the first end of the fixed body is butted against the rear joint;

[0023] Along the axial direction of the clamping ring connection structure, the second surface of the first end of the fixing body contacts or abuts against the clamping ring connection structure outside the clamping groove, and the second end of the fixing body is connected to the nozzle expansion section.

[0024] Optionally, the solid rocket engine also includes an insulation structure, which is fixedly connected to the rear joint.

[0025] The beneficial technical effects brought about by the technical solution provided by the embodiment of the present application include:

[0026] In the embodiment of the present application, the snap ring connection structure is hinged between the snap ring blocks that make up the snap ring chain, the number of snap ring chains is equal to the number of fixed blocks, one end of each fixed block is hinged to the snap ring block at one end of an adjacent snap ring chain, and the other end of the solid block is hinged to the snap ring block at one end of another adjacent snap ring chain, forming an annular rigid snap ring connection structure. During the installation process of the snap ring connection structure being connected to the slot of the inner peripheral wall of the rear joint of the solid rocket engine, a single snap ring block is installed into the slot, and adjacent snap ring blocks are hinged to form a snap ring chain. Along the circumference of the inner peripheral wall of the rear joint of the solid rocket engine, the two ends of the fixed block are respectively hinged to the snap ring blocks of the adjacent snap ring chain, forming an annular rigid snap ring connection structure, so that during the installation process of the snap ring connection structure, no special hydraulic auxiliary tooling is required for clamping, and it is easy to install, has strong process adaptability, and does not need to be prefabricated on the nozzle before installation, thereby improving installation efficiency.

[0027] Additional aspects and advantages of the present application will be partially given in the following description, which will become apparent from the following description, or will be understood through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0029] Figure 1 A schematic diagram of the structure of a solid rocket engine rear joint provided in an embodiment of the present application;

[0030] Figure 2 A three-dimensional schematic diagram of a clamping ring connection structure provided in an embodiment of the present application;

[0031] Figure 3 A front view of a clamping ring connection structure provided in an embodiment of the present application;

[0032] Figure 4 A left side view of a clamping ring connection structure provided in an embodiment of the present application;

[0033] Figure 5 This is a schematic diagram of the structure of the clasp chain in the embodiment of the present application;

[0034] Figure 6 This is a structural schematic diagram of the positional relationship between the snap ring chain and the fixed block in the embodiment of the present application;

[0035] Figure 7 This is a front view of the snap ring chain and the fixing block in the embodiment of the present application;

[0036] Figure 8 This is a front view of a fixing block in an embodiment of the present application;

[0037] Fig. 9 This is a schematic diagram of the structure of the clamping ring block in the embodiment of the present application;

[0038] Fig.10 It is a side view of the retaining ring block in the embodiment of the present application.

[0039] Reference numerals:

[0040] 100-clamp ring connection structure;

[0041] 110- snap ring chain; 111- snap ring block; 1111- base portion; 11111- inner ring portion; 11112- outer ring portion; 1112- raised portion; 1113- first connecting portion; 11131- first through hole; 1114- second connecting portion; 11141- second through hole;

[0042] 120-fixed block; 121-first part; 122-second part; 123-third connecting part; 1231-third through hole; 124-fourth connecting part; 1241-fourth through hole;

[0043] 200 - rear joint of the rocket engine; 300 - fixed body of the rocket engine; 310 - first end of the fixed body; 311 - first surface of the first end; 312 - second surface of the first end; 320 - second end of the fixed body; 400 - nozzle expansion section; 500 - thermal insulation structure. DETAILED DESCRIPTION

[0044] The embodiments of the present application are described below in conjunction with the drawings in the present application. It should be understood that the implementation methods described below in conjunction with the drawings are exemplary descriptions for explaining the technical solutions of the embodiments of the present application and do not constitute a limitation on the technical solutions of the embodiments of the present application.

[0045] Those skilled in the art will appreciate that, unless expressly stated otherwise, the singular forms "a", "an", "said" and "the" used herein may also include plural forms. It should be further understood that the term "comprising" used in the specification of the present application refers to the presence of the features, integers, steps, operations, elements and / or components, but does not exclude the implementation of other features, information, data, steps, operations, elements, components and / or combinations thereof supported by the technical field. The term "and / or" used herein refers to at least one of the items defined by the term, for example, "A and / or B" may be implemented as "A", or as "B", or as "A and B".

[0046] In order to make the objectives, technical solutions and advantages of the present application clearer, the implementation methods of the present application will be further described in detail below in conjunction with the accompanying drawings.

[0047] Solid rocket engines are composed of multiple parts, which are usually connected by connecting structures. Traditional connecting structures are mostly flange structures, but the overall weight of the flange structure is heavy, which is not conducive to improving the carrying capacity of the launch vehicle. In the process of lightweight structure development, the snap ring connection structure began to be used. However, the snap ring connection structures currently used are all rigid parts, which makes the installation of the snap ring connection structure difficult and has poor process adaptability.

[0048] The following is a detailed description of the technical solution of the present application and how the technical solution of the present application solves the above technical problems with specific embodiments. It should be noted that the following implementations can refer to, draw on or combine with each other, and the same terms, similar features and similar implementation steps in different implementations will not be described repeatedly.

[0049] In a first aspect, an embodiment of the present application provides a clamping ring connection structure 100, such as Figure 1-10 As shown, the snap ring connection structure 100 includes: at least one snap ring chain 110 and at least one fixing block 120 ; the snap ring chain 110 includes at least two hinged snap ring blocks 111 .

[0050] When the snap ring chain 110 and the fixing block 120 are both one, the two ends of the fixing block 120 are respectively hinged to the snap ring blocks 111 at the two ends of the snap ring chain 110 to form an annular rigid snap ring connection structure 100 .

[0051] When there are more than two snap ring chains 110 and fixed blocks 120, one end of the fixed block 120 is hinged to the snap ring block 111 at one end of a snap ring chain 110, and the other end of the fixed block 120 is hinged to the snap ring block 111 at the other end of the adjacent snap ring chain 110, forming an annular rigid snap ring connection structure 100.

[0052] The snap ring connection structure 100 is configured to be at least partially snapped into a snap groove on the inner peripheral wall of the rear joint 200 of the solid rocket motor.

[0053] The snap ring connection structure 100 in the embodiment of the present application is hinged between the snap ring blocks 111 that constitute the snap ring chain 110, the number of the snap ring chains 111 is equal to the number of the fixed blocks 120, one end of each fixed block 120 is hinged to the snap ring block 111 at one end of an adjacent snap ring chain 110, and the other end of the solid block 120 is hinged to the snap ring block 111 at one end of another adjacent snap ring chain 110, forming an annular rigid snap ring connection structure 100. During the installation process of the snap ring connection structure 100 being snapped into the slot of the inner wall of the rear joint 200 of the solid rocket engine, a single snap ring block 111 is installed into the slot, and adjacent snap ring blocks 111 are hinged to form a snap ring chain 110. Along the circumferential direction of the inner wall of the rear joint 200 of the solid rocket engine, the two ends of the fixed block 120 are respectively hinged to the snap ring blocks 111 of the adjacent snap ring chain 110 to form an annular rigid snap ring connection structure 100. Therefore, during the installation process of the snap ring connection structure 100, no special hydraulic auxiliary tooling is required for clamping. The snap ring connection structure 100 is easy to install and has strong process adaptability. In addition, it does not need to be prefabricated on the nozzle before installation, thereby improving the installation efficiency. It should be noted that if Figure 1 As shown, direction X refers to the axial direction of the snap ring connection structure 100 , and direction Y refers to the radial direction of the snap ring connection structure 100 .

[0054] In the embodiment of the present application, the number of snap ring chains 110 can be adjusted according to the size of the structure to be actually installed, and the number of snap ring blocks 111 included in each snap ring chain 110 can also be adjusted according to the size of the structure to be installed, so that the snap ring connection structure of the present application can be used for a variety of structures, has strong applicability, and a wide design coverage range, so that the snap ring connection structure 100 of the present application can be used for the connection structure of a variety of products.

[0055] Optionally, in one embodiment of the present application, see Figure 1-7 and Figure 9-10 As shown, the snap ring block 111 includes a base portion 1111 and at least one protrusion 1112 .

[0056] In a radial plane of the clamping ring connection structure 100 , the base portion 1111 is a ring-shaped segment, including an inner ring portion 11111 and an outer ring portion 11112 , and the protrusion 1112 is arranged on the inner ring portion 11111 .

[0057] In the axial plane of the clamping ring connection structure 100 , the protrusion 1112 and the base portion 1111 are at a designed angle.

[0058] The outer ring portion 11112 is constructed to be clamped in the groove of the inner wall of the rear joint 200 along the radial direction of the clamping ring connection structure 100, and the inner ring portion 11111 is constructed to contact or abut with the fixed body 300 of the solid rocket engine; the raised portion 1112 is constructed to contact or abut with the inner wall of the rear joint 200 along the radial direction.

[0059] In the embodiment of the present application, along the radial direction of the snap ring connection structure 100, the portion of the base portion 1111 not covered by the protrusion 1112 is outwardly snapped into the groove of the rear joint 200 of the solid rocket engine, and the protrusion 1112 is at least partially in contact with or abuts against the inner wall of the rear joint 200; along the axial direction of the snap ring connection structure 100, the portion of the base portion 1111 away from the protrusion 1112 is in contact with or abuts against the fixed body 300 of the solid rocket engine. The snap ring block 111 is firmly installed on the rear joint 200; then the adjacent snap ring blocks 111 are hinged to form a snap ring chain 110, and the hinged connection points of the adjacent snap ring blocks 111 are located at the inner ring part 11111 outside the clamping groove of the rear joint 200, so that the snap ring chain 110 has only inward freedom; further, the two ends of the fixed block 120 are respectively hinged to the snap ring blocks 111 at the two ends of the snap ring chain 110 to form an annular rigid snap ring connection structure 100; along the circumference of the snap ring connection structure 100, the fixed block 120 and the snap ring chain 110 are interference fitted, and the snap ring chain 110 has only inward freedom, so that the snap ring connection structure 100 can be firmly located on the inner circumferential wall of the rear joint 200 without the risk of detachment.

[0060] It should be noted that in the embodiment of the present application, along the radial direction of the snap ring connection structure 100, the direction toward the center of the snap ring connection structure 100 is inward, and the direction away from the center of the snap ring connection structure 100 is outward.

[0061] Optionally, in one embodiment of the present application, see Figure 2-7 and Figure 9-10 As shown, along the circumference of the snap ring connection structure 100, the outer ring portions 11112 of any two adjacent snap ring blocks 111 abut against each other, and the two ends of the inner ring portion 11111 of the snap ring block 111 respectively include a first connection portion 1113 and a second connection portion 1114; the first connection portion 1113 and the second connection portion 1114 are respectively provided with a first through hole 11131 and a second through hole 11141.

[0062] The first through hole 11131 of the first connecting portion 1113 of one snap ring block 111 is axially connected to the second through hole 11141 of the second connecting portion 1114 of another adjacent snap ring block 111 and is hinged via a pin.

[0063] In the embodiment of the present application, the base portion 1111 of the snap ring block 111 includes an outer ring portion 11112 and an inner ring portion 11111. Along the circumference of the snap ring connection structure 100, the arc length of the outermost side of the outer ring portion 11112 is greater than the arc length of the innermost side of the inner ring portion 11111. The first connection portion 1113 and the second connection portion 1114 of the snap ring block 111 are respectively arranged at both ends of the inner ring portion 11111. When the snap ring blocks 111 form a snap ring chain 110, the first through hole 11131 of the first connection portion 1113 of one snap ring block 111 is connected to the second through hole 11141 of the second connection portion 1114 of another adjacent snap ring block 111 in the axial direction, and are hinged by a pin shaft, and so on, to form a snap ring chain 110. Since the first connection part 1113 and the second connection part 1114 of the snap ring block 111 are respectively arranged at the two ends of the inner ring part 11111, the snap ring chain 110 has an inward degree of freedom. When the snap ring chain 110 is bent outward, the outer ring parts 11112 of adjacent snap ring blocks 111 abut against each other, so that the snap ring chain 110 does not have an outward degree of freedom. In the assembled snap ring connection structure 100, along the circumference of the snap ring connection structure 100, the two ends of the fixed block 120 and the snap ring blocks 111 of the adjacent snap ring chain 110 are interference fit, so that the outer ring parts 11112 of any adjacent snap ring blocks 111 in the installed snap ring connection structure 100 abut against each other, so that the snap ring connection structure 100 forms a quasi-rigid body. The snap ring connection structure 100 in the embodiment of the present application has a compact structure, and the total weight of the snap ring connection structure 100 is lighter than that of the traditional flange connection structure, thereby reducing the overall weight of the connection area.

[0064] In the embodiment of the present application, the snap ring blocks 111 constituting the snap ring chain 110 are connected by hinges, so that any snap ring block 111 in the snap ring chain 110 can be disassembled and replaced at will, thereby facilitating maintenance.

[0065] Optionally, in the embodiment of the present application, the hinge pin of the first connection part 1113 of one snap ring block 111 and the second connection part 1114 of another adjacent snap ring block 111 includes a rivet, a bolt, etc. When a rivet is used, the first connection part 1113 of one snap ring block 111 is riveted to the second connection part 1114 of another adjacent snap ring block 111; along the axial direction of the first connection hole 11131 and the second connection hole 11141, the rivet that exceeds the first connection hole 11131 and the second connection hole 11141 is ground flat, so that the length of the rivet is not greater than the sum of the axial dimensions of the first connection hole 11131 and the second connection hole 11141, so that the connection area of ​​the first connection hole 11131 and the second connection hole 11141 has a high flatness, which does not affect the installation and docking of the parts.

[0066] It should be noted that the clasp chain 110 in the embodiment of the present application has only an inward degree of freedom, but no outward degree of freedom. According to the specific application object of the clasp connection structure 100, the clasp connection structure 100 can also be designed so that the clasp chain 110 has only an outward degree of freedom, but no inward degree of freedom. This solution is similar to the present application and will not be repeated in the present application.

[0067] Optionally, in one embodiment of the present application, see Figure 2-6 and Figure 9-10 As shown, in the axial plane of the clamping ring connection structure 100 , the protrusion 1112 is perpendicular to the base portion 1111 .

[0068] In the embodiment of the present application, in the axial plane of the snap ring connection structure 100, the protrusion 1112 is perpendicular to the base portion 1111, so that the snap ring connection structure 100 can be connected to the inner wall of the rear joint 200 of the rocket engine in two directions at the same time in the axial plane, thereby improving the stability of the snap ring connection structure 100 and increasing the size of the snap ring connection structure 100, thereby enhancing the bearing capacity of the snap ring connection structure 100.

[0069] Optionally, in one embodiment of the present application, see Figure 1-6 and Figure 9-10 As shown, along the radial direction of the clamping ring connection structure 100, the inner ring portion 11111 is away from the side of the outer ring portion 11112, and is located on the same pitch circle as the side of the protruding portion 1112 is away from the outer ring portion 11112; in the axial plane of the clamping ring connection structure 100, the cross-sectional shape of the protruding portion 1112 and the base portion 1111 includes an L-shape.

[0070] In the embodiment of the present application, along the radial direction of the snap-ring connection structure 100, the inner side surface of the protrusion 1112 is flush with the inner side surface of the inner ring portion 11111 of the base portion 1111, and in the axial plane of the snap-ring connection structure 100, the cross-sectional shape of the protrusion 1112 and the base portion 1111 includes an L-shape, so that the lateral dimension of the snap-ring connection structure 100 is increased, thereby enhancing the load-bearing capacity of the snap-ring connection structure 100, thereby being safer and more reliable.

[0071] Optionally, in one embodiment of the present application, see Figure 2-3 and Figure 6-8 As shown, the fixing block 120 includes a first portion 121 and a second portion 122 . In the axial plane of the snap ring connection structure 100 , the first portion 121 is perpendicular to the second portion 122 , and the cross-sectional shape of the first portion 121 and the second portion 122 includes an L-shape.

[0072] In the embodiment of the present application, along the radial direction of the snap ring connection structure 100, the first portion 121 of the fixing block 120 is located on a side close to the center of the snap ring connection structure, and the second portion 122 of the fixing block 120 is located on a side of the first portion 121 away from the center of the snap ring connection structure 100. In the axial plane of the snap ring connection structure 100, the first portion 121 of the fixing block 120 is perpendicular to the second portion 122, and the cross-sectional shape of the first portion 121 and the second portion 122 includes an L-shape, so that the shape of the fixing block 120 is the same as that of the snap ring block 111, so that the force at various locations of the snap ring connection structure 100 is uniform, thereby improving the bearing capacity of the snap ring connection structure 100.

[0073] Optionally, in one embodiment of the present application, see Figure 1-5 As shown, along the radial direction of the clamping ring connection structure 100, the side of the first part 121 away from the second part 122 is located on the same pitch circle as the side of the inner ring part 11111 away from the outer ring part 11112, and the side of the second part 122 away from the first part 121 is located on the same pitch circle as the side of the outer ring part 11112 away from the inner ring part 11111.

[0074] In the embodiment of the present application, in the radial plane of the snap ring connection structure 100, the innermost side of the first part 121 of the fixing block 120 and the innermost side of the inner ring part 11111 of the snap ring block 111 of the snap ring chain 110 are located on the same pitch circle, and the outermost side of the second part 122 of the fixing block 120 and the outermost side of the outer ring part 11112 of the snap ring block 111 of the snap ring chain 110 are located on the same pitch circle, so that the snap ring connection structure 100 is subjected to uniform force at various locations, avoiding stress concentration at the protruding part, thereby improving the service life of the snap ring connection structure 100. It should be noted that the fixing block 120 in the embodiment of the present application is manufactured by integral molding.

[0075] Optionally, in one embodiment of the present application, see Figure 1-7 As shown, the two ends of the first portion 121 of the fixing block 120 include a third connecting portion 123 and a fourth connecting portion 124, respectively. The third connecting portion 123 and the fourth connecting portion 124 are respectively provided with a third through hole 1231 and a fourth through hole 1241;

[0076] Along the circumferential direction of the snap ring connection structure 100 , two ends of the second portion 122 of the fixing block 120 abut against two adjacent snap ring blocks 111 , respectively.

[0077] The third through hole 1231 of the third connecting portion 123 of the fixed block 120 is axially connected to the first through hole 11131 of the first connecting portion 1113 of an adjacent retaining ring block 111, and are hinged by a pin; the fourth through hole 1241 of the fourth connecting portion 124 of the fixed block 120 is axially connected to the second through hole 11141 of the second connecting portion 1114 of another adjacent retaining ring block 111, and are hinged by a pin.

[0078] Optionally, when there are both one snap ring chain 110 and one fixed block 120, the two snap ring blocks 111 adjacent to (the second portion 122 of) the fixed block 120 include the snap ring blocks 111 at both ends of the snap ring chain 110. When there are at least two snap ring chains 110 and at least two fixed blocks 120, the two snap ring blocks 111 adjacent to (the second portion 122 of) the fixed block 120 include the snap ring block 111 at one end of one snap ring chain 110, and the snap ring block 111 at the other (i.e. adjacent) end of another adjacent snap ring chain 110.

[0079] In the embodiment of the present application, along the circumference of the snap ring connection structure 100, the two ends of the second part 122 of the fixed block 120 are respectively abutted against the snap ring block 111 of the adjacent snap ring chain 110, and the third connection part 121 and the fourth connection part 124 of the fixed block 120 are respectively located at the two ends of the first part 121; the third connection part 123 of the fixed block 120 is hinged to the first connection part 1113 of the snap ring block 111 of the adjacent snap ring chain 110, and the fourth connection part 124 of the fixed block 120 is hinged to the second connection part 1114 of another adjacent snap ring block 111. Along the circumference of the snap ring connection structure 100, the fixed block 120 and the snap ring chain 110 are interference fitted, so that the fixed block 120 is clamped between the adjacent snap ring blocks 111 on both sides, so that the fixed block 120 only has radial freedom along the snap ring connection structure 100, and the fixed block 120 has no circumferential freedom along the snap ring connection structure 100, thereby ensuring that the snap ring connection structure 100 is reliably assembled.

[0080] In the embodiment of the present application, a plurality of snap ring blocks 111 are hinged to form a snap ring chain 110, and the two ends of the fixed block 120 are hinged to the snap ring blocks 111 of the adjacent snap ring chain 110 to form a snap ring connection structure 100. The snap ring connection structure 100 can be processed in a split manner, thereby reducing the requirements for processing accuracy, and equipment with low processing accuracy can be used for processing, thereby reducing the cost of the required processing equipment and the production cost, while improving production efficiency.

[0081] Based on the same inventive concept, the embodiment of the present application improves a solid rocket engine. Figure 1 As shown, the solid rocket engine includes: a rear joint 200, a fixed body 300, a nozzle expansion section 400 and any one of the clamping ring connection structures 100 in the first aspect described above.

[0082] Along the radial direction of the snap ring connection structure 100 , the snap ring connection structure 100 is at least partially snapped into the snap groove of the inner circumferential wall of the rear joint 200 , and the first surface 311 of the first end 310 of the fixing body 300 is butted against the rear joint 200 .

[0083] Along the axial direction of the clamping ring connection structure 100 , the second surface 312 of the first end 310 of the fixing body 300 contacts or abuts against the clamping ring connection structure 100 outside the clamping groove, and the second end 320 of the fixing body 300 is connected to the nozzle expansion section 400 .

[0084] In the embodiment of the present application, along the radial direction of the snap ring connection structure 100, the part of the base portion 1111 of the snap ring block 111 of the snap ring connection structure 100 that is not covered by the protrusion 1112 is outwardly snapped into the slot of the rear joint 200, and the protrusion 1112 at least partially contacts or abuts against the inner wall of the rear joint 200; the first surface 311 of the first end 310 of the fixed body 300 is butted against the rear joint 200. Along the axial direction of the snap ring connection structure 100, the part of the base portion 1111 away from the protrusion 1112 contacts or abuts against the second surface 312 of the first end 310 of the fixed body 300, and the second end 320 of the fixed body 300 is connected to the nozzle expansion section 400.

[0085] In the embodiment of the present application, the snap ring connection structure 100 has only inward freedom. When the fixed body 300 is axially connected to the rear joint 200, the snap ring connection structure 100 can be installed step by step in the limited space between the fixed body 300 and the nozzle expansion section 400. Since the snap ring blocks 111 that constitute the snap ring chain 110 are hinged, the snap ring chain 110 is a non-rigid part. When the snap ring chain 110 is installed, there is no need to clamp the snap ring blocks 111 through special auxiliary tooling, so it is easy to install. After the snap ring chain 110 is installed in place, the snap ring connection structure 100 is not easily removed by interference fit with the snap ring chain 110 through the fixed block 120.

[0086] Optionally, in a specific embodiment of the present application, taking a heavy solid rocket engine with a diameter of 1.4m (meters) as an example, if the front opening and the rear opening adopt a traditional flange connection structure, the weight of the rear joint, the fixed body flange structure and the bolt direct parts is about 40kg (kilograms). If the flange connection structure is changed to the retaining ring connection structure 100 of the present application, the weight of the connection area structure can be reduced by about 40%, thereby improving the carrying capacity of the launch vehicle.

[0087] It should be noted that in Figure 1 In the figure, the broken line in the nozzle expansion section 400 indicates that only a part of the nozzle expansion section 400 is intercepted, and the broken line does not represent the boundary of the nozzle expansion section 400.

[0088] Optionally, in one embodiment of the present application, see Figure 1 As shown, the solid rocket engine also includes an insulation structure 500 , which is fixedly connected to the rear joint 200 .

[0089] In the embodiment of the present application, a heat insulating structure 500 is further provided on the outer side of the rear joint 200 , and the rear joint 200 and the heat insulating structure 500 can be fixedly connected by gluing, specifically, can include compression molding.

[0090] By applying the embodiments of the present application, at least the following beneficial effects can be achieved:

[0091] 1. The snap ring connection structure 100 in the embodiment of the present application is hinged between the snap ring blocks 111 that constitute the snap ring chain 110, the number of the snap ring chains 111 is equal to the number of the fixed blocks 120, one end of each fixed block 120 is hinged to the snap ring block 111 at one end of an adjacent snap ring chain 110, and the other end of the solid block 120 is hinged to the snap ring block 111 at one end of another adjacent snap ring chain 110, forming an annular rigid snap ring connection structure 100. During the installation process of the snap ring connection structure 100 being snapped into the slot on the inner wall of the rear joint 200 of the solid rocket engine, a single snap ring block 111 is installed into the slot, and adjacent snap ring blocks 111 are hinged to form a snap ring chain 110. Along the circumferential direction of the inner wall of the rear joint 200 of the solid rocket engine, the two ends of the fixed block 120 are respectively hinged to the snap ring blocks 111 of the adjacent snap ring chain 110 to form an annular rigid snap ring connection structure 100. Therefore, during the installation process of the snap ring connection structure 100, no special hydraulic auxiliary tooling is required for clamping. The snap ring connection structure 100 is easy to install and has strong process adaptability. In addition, it does not need to be prefabricated on the nozzle before installation, thereby improving installation efficiency.

[0092] 2 / In the embodiment of the present application, the base portion 1111 of the snap ring block 111 includes an outer ring portion 11112 and an inner ring portion 11111. Along the circumference of the snap ring connection structure 100, the arc length of the outermost side of the outer ring portion 11112 is greater than the arc length of the innermost side of the inner ring portion 11111. The first connection portion 1113 and the second connection portion 1114 of the snap ring block 111 are respectively arranged at both ends of the inner ring portion 11111. When the snap ring blocks 111 form a snap ring chain 110, the first through hole 11131 of the first connection portion 1113 of one snap ring block 111 is axially connected to the second through hole 11141 of the second connection portion 1114 of another adjacent snap ring block 111, and are hinged by a pin shaft, and so on, to form a snap ring chain 110. Since the first connection part 1113 and the second connection part 1114 of the snap ring block 111 are respectively arranged at the two ends of the inner ring part 11111, the snap ring chain 110 has an inward degree of freedom. When the snap ring chain 110 is bent outward, the outer ring parts 11112 of adjacent snap ring blocks 111 abut against each other, so that the snap ring chain 110 does not have an outward degree of freedom. In the assembled snap ring connection structure 100, along the circumference of the snap ring connection structure 100, the two ends of the fixed block 120 and the snap ring blocks 111 of the adjacent snap ring chain 110 are interference fit, so that the outer ring parts 11112 of any adjacent snap ring blocks 111 in the installed snap ring connection structure 100 abut against each other, so that the snap ring connection structure 100 forms a quasi-rigid body. The snap ring connection structure 100 in the embodiment of the present application has a compact structure, and the total weight of the snap ring connection structure 100 is lighter than that of the traditional flange connection structure, thereby reducing the overall weight of the connection area.

[0093] Those skilled in the art will appreciate that the various operations, methods, steps, measures, and schemes in the processes discussed in this application may be alternated, altered, combined, or deleted. Further, other steps, measures, and schemes in the various operations, methods, and processes discussed in this application may also be alternated, altered, rearranged, decomposed, combined, or deleted. Further, the steps, measures, and schemes in the prior art that are similar to those disclosed in this application may also be alternated, altered, rearranged, decomposed, combined, or deleted.

[0094] In the description of the present application, the directions or positional relationships indicated by words such as "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the exemplary directions or positional relationships shown in the accompanying drawings. They are for the convenience of describing or simplifying the description of the embodiments of the present application, and do not indicate or imply that the referred device or component must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on the present application.

[0095] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0096] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0097] In the description of this specification, specific features, structures, materials or characteristics may be combined in an appropriate manner in any one or more embodiments or examples.

[0098] It should be understood that, although the various steps in the flowchart of the accompanying drawings are displayed in sequence according to the indication of the arrows, the order of implementation of these steps is not limited to the order indicated by the arrows. Unless there is a clear description herein, in some implementation scenarios of the embodiments of the present application, the steps in each process can be performed in other orders according to demand. Moreover, some or all of the steps in each flow chart may include multiple sub-steps or multiple stages based on actual implementation scenarios. Some or all of these sub-steps or stages may be executed at the same time, or may be executed at different times in different scenarios at the execution time, and the execution order of these sub-steps or stages may be flexibly configured according to demand, and the embodiments of the present application do not limit this.

[0099] The above is only a partial implementation method of the present application. It should be pointed out that for ordinary technicians in this technical field, without departing from the technical concept of the scheme of the present application, other similar implementation methods based on the technical ideas of the present application are also within the protection scope of the embodiments of the present application.

Claims

1. A snap ring connection structure, characterized in that: include: At least one clasp chain and at least one fixing block; the clasp chain comprises at least two hinged clasp blocks; When the clasp chain and the fixing block are both one, the two ends of the fixing block are respectively hinged to the clasp blocks at the two ends of the clasp chain to form an annular rigid clasp connection structure; When there are more than two clasp chains and two fixing blocks, one end of the fixing block is hinged to the clasp block at one end of one clasp chain, and the other end of the fixing block is hinged to the clasp block at the other end of the adjacent clasp chain to form an annular rigid clasp connection structure; The snap ring connection structure is configured to be at least partially snapped into a snap groove on the inner peripheral wall of the rear joint of the solid rocket motor; The snap ring block includes a base portion and at least one raised portion; In the radial plane of the clamping ring connection structure, the base portion is an annular segment, including an inner ring portion and an outer ring portion, and the protrusion is arranged on the inner ring portion; In the axial plane of the clamping ring connection structure, the protrusion and the base portion are at a designed angle; The outer ring portion is configured to be clamped in the clamping groove of the inner peripheral wall of the rear joint along the radial direction of the clamping ring connection structure, and the inner ring portion is configured to contact or abut against the fixed body of the solid rocket engine; the protrusion portion is configured to contact or abut against the inner wall of the rear joint along the radial direction, so that the clamping ring block is stably installed on the rear joint; The adjacent snap ring blocks are hinged to form the snap ring chain, and the hinged connection points of the adjacent snap ring blocks are located at the inner ring part outside the clamping groove of the rear joint, so that the snap ring chain has only inward freedom; and along the circumference of the snap ring connection structure, the fixed block and the snap ring chain are interference fitted; so that the snap ring connection structure can be firmly located on the inner circumferential wall of the rear joint.

2. The clamping ring connection structure according to claim 1, characterized in that: Along the circumference of the snap ring connection structure, the outer ring parts of any two adjacent snap ring blocks are in contact with each other, and the two ends of the inner ring part of the snap ring block respectively include a first connecting part and a second connecting part; the first connecting part and the second connecting part are respectively provided with a first through hole and a second through hole; The first through hole of the first connecting portion of one of the snap ring blocks is connected to the second through hole of the second connecting portion of another adjacent snap ring block along the axial direction and are hinged via a pin shaft.

3. The clamping ring connection structure according to claim 2, characterized in that: In an axial plane of the clamping ring connection structure, the protrusion is perpendicular to the base portion.

4. The clamping ring connection structure according to claim 3, characterized in that: Along the radial direction of the clamping ring connection structure, the side of the inner ring portion away from the outer ring portion is located on the same pitch circle as the side of the protruding portion away from the outer ring portion; in the axial plane of the clamping ring connection structure, the cross-sectional shape of the protruding portion and the base portion includes an L shape.

5. The clamping ring connection structure according to claim 4, characterized in that: The fixing block includes a first portion and a second portion. In an axial plane of the clamping ring connection structure, the first portion is perpendicular to the second portion. The cross-sectional shapes of the first portion and the second portion include an L shape.

6. The clamping ring connection structure according to claim 5, characterized in that: Along the radial direction of the clamping ring connection structure, the side of the first part away from the second part is located on the same pitch circle as the side of the inner ring part away from the outer ring part, and the side of the second part away from the first part is located on the same pitch circle as the side of the outer ring part away from the inner ring part.

7. The clamping ring connection structure according to claim 6, characterized in that: The two ends of the first part of the fixing block respectively include a third connecting part and a fourth connecting part, and the third connecting part and the fourth connecting part are respectively provided with a third through hole and a fourth through hole; Along the circumferential direction of the snap ring connection structure, two ends of the second portion of the fixing block are respectively in contact with two adjacent snap ring blocks; The third through hole of the third connecting part of the fixed block is connected to the first through hole of the first connecting part of an adjacent retaining ring block along the axial direction and are hinged by a pin; the fourth through hole of the fourth connecting part of the fixed block is connected to the second through hole of the second connecting part of another adjacent retaining ring block along the axial direction and are hinged by a pin.

8. A solid rocket engine, characterized in that: include: A rear joint, a fixed body, a nozzle expansion section and a clamping ring connection structure as described in any one of claims 1 to 7; Along the radial direction of the snap ring connection structure, the snap ring connection structure is at least partially snapped into the snap groove of the inner peripheral wall of the rear joint, and the first surface of the first end of the fixed body is butted against the rear joint; Along the axial direction of the clamping ring connection structure, the second surface of the first end of the fixing body contacts or abuts against the clamping ring connection structure outside the clamping groove, and the second end of the fixing body is connected to the nozzle expansion section.

9. The solid rocket motor according to claim 8, characterized in that: It also includes a heat insulation structure, which is fixedly connected to the rear joint.

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