A joint structure for a liquid rocket propellant filling line and a filling line

Abstract

The utility model provides a kind of for liquid rocket propellant filling pipe's joint structure and filling pipe, include pipe joint, metal bellows and metal mesh cover. Wherein, the pipe joint is the structure with flow passage being equipped in both ends, in the inside of the pipe joint, the outer wall of the metal bellows is mutually pasted close connection with the inner wall of the pipe joint. The pipe joint inside is equipped with concave part, the concave part is along the circumferential direction of the pipe joint and is concave to the side of the axis of the pipe joint. The part of the metal bellows and the inner wall of the pipe joint connection includes the part of surface close to the concave part, the metal bellows and the end of the pipe joint are welded connection. The joint structure of the application can avoid that bellows and joint welding place crack due to turning angle become larger, bending stress increase in the process of rocket pipe filling connection and separation when using, ensure propellant safe filling, improve work efficiency.

Description

Technical Field

[0001] This utility model relates to the field of mechanics, and in particular to a connector structure and a refueling pipeline for liquid rocket propellant filling. Background Technology

[0002] With the rapid development of the aerospace industry, various technologies involved in the rocket field have also made leaps and bounds. Currently, rockets are the main launch vehicles for sending satellites into space; therefore, continuously reducing the cost of rocket manufacturing and launch is a goal pursued by major commercial aerospace companies.

[0003] To facilitate the transport of liquid media between the ground and the rocket, corrugated pipes are usually required. Because of their strong adaptability and long service life, corrugated pipes are widely used in many fields such as petrochemicals, aerospace, and power.

[0004] Especially in the aerospace field, during the "three-flat" testing and launch modes of liquid rockets, the joints at both ends of the zero-second detachment umbilical cord of cryogenic liquid rockets are suspended. The connection points between these joints and the bellows need to withstand significant tilting angles and bending stresses in the mission profile. Traditional bellows-joint connections are too weak and cannot meet the operational requirements of this environment, causing cracks at the welded joints and leading to propellant leakage. This not only affects propellant loading but also compromises the safe launch of the rocket.

[0005] Therefore, the current problem to be solved is how to provide a reasonably designed, structurally stable, safe and reliable system that can prevent cracking at the welded joints of the bellows and connectors during use and ensure safe propellant filling. Summary of the Invention

[0006] The purpose of this invention is to overcome the shortcomings of existing technologies and provide a connector structure for liquid rocket propellant refueling pipelines. This structure is stable, safe, and reliable. During use, it can prevent cracking at the weld between the bellows and the connector due to increased twisting angle and bending stress, ensuring safe propellant refueling and improving work efficiency.

[0007] This utility model provides a connector structure for a liquid rocket propellant refueling pipeline, comprising a pipe connector, a metal bellows, and a metal mesh sleeve, wherein...

[0008] The pipe joint is a structure with two open ends and an internal flow channel. On the inner side of the pipe joint, the outer wall of the metal corrugated pipe is tightly connected to the inner wall of the pipe joint.

[0009] The pipe joint has a recessed portion inside, which is recessed inward along the circumferential direction of the pipe joint to the side away from the axis of the pipe joint.

[0010] The portion of the corrugated metal pipe connected to the inner wall of the pipe joint includes a portion that is in close contact with the surface of the recessed portion; the end of the corrugated metal pipe is welded to the pipe joint; and the metal mesh sleeve is fitted onto the outer wall surface of the pipe joint.

[0011] Furthermore, the metal mesh sleeve is welded to the outer wall of the pipe joint.

[0012] Furthermore, the end face of the recessed portion intersecting the axial direction of the pipe joint has a curved structure.

[0013] Furthermore, the radius of the curved structure is N, where 0π < N ≤ π.

[0014] Furthermore, the length of the pipe joint along the axial direction is A, and the distance from the center of the recess to the end of the pipe joint away from the metal bellows is B, and 1 / 4A≤B≤3 / 4A.

[0015] Furthermore, the thickness of the metal corrugated pipe is less than the thickness of the metal mesh sleeve.

[0016] Furthermore, the thickness of the metal mesh sleeve is less than the thickness of the pipe joint.

[0017] Furthermore, the surface of the metal mesh sleeve is provided with a waterproof layer, which is in close contact with the surface of the metal mesh sleeve and the two are connected by an adhesive.

[0018] Furthermore, the portion of the metal bellows that is in close contact with the surface of the recessed portion is obtained by an internal expansion joint tool, wherein the expansion joint tool is used to tightly attach the metal bellows and the recessed portion together without gap.

[0019] This utility model also provides a refueling pipeline, which is prepared from the above-mentioned joint structure for liquid rocket propellant refueling pipeline.

[0020] This utility model provides a connector structure for a liquid rocket propellant refueling pipeline, comprising a pipe connector, a metal bellows, and a metal mesh sleeve. The pipe connector has a recessed portion inside, which is recessed along the circumferential direction of the pipe connector away from its axis. The portion of the metal bellows that connects to the inner wall of the pipe connector includes a part that is in close contact with the surface of the recessed portion. The recessed portion increases the contact area between the outer wall of the metal bellows and the inner wall of the pipe connector, resulting in a tighter connection.

[0021] By tightly connecting the outer wall of the metal bellows with the inner wall of the pipe joint, the expansion and contraction of the metal bellows within the pipe joint can be reduced, while ensuring rapid movement of the liquid medium within the pipe joint, thereby increasing the efficiency of liquid medium transportation.

[0022] By welding the ends of the metal corrugated pipe and the pipe fitting together, the connection between the metal corrugated pipe and the pipe fitting is made tighter and more secure, thus preventing displacement between the metal corrugated pipe and the pipe fitting.

[0023] By placing a metal mesh sleeve on the outer wall surface of the pipe joint, it helps to connect the metal bellows to the pipe joint, prevents impurities from entering the gap between the metal bellows and the pipe joint, and ensures the quality of the propellant.

[0024] The entire structure is stable and reliable. During use, it can prevent cracking at the weld between the bellows and the joint due to increased bending stress caused by larger rotation angles, thus ensuring safe propellant loading and improving work efficiency.

[0025] It should be understood that the above general description and the following specific embodiments are merely exemplary and illustrative, and do not limit the scope of the present invention. Attached Figure Description

[0026] The accompanying drawings are part of the specification of this utility model and illustrate exemplary embodiments of the utility model. The drawings, together with the description in the specification, are used to illustrate the principles of this utility model.

[0027] Figure 1 This is a schematic diagram of the connector structure in an embodiment of the present utility model;

[0028] Figure 2 This is a schematic diagram of the joint structure and the expansion joint tooling in an embodiment of this utility model;

[0029] Figure 3 This is a cross-sectional schematic diagram of the recessed portion in an embodiment of this utility model.

[0030] Explanation of reference numerals in the attached figures:

[0031] 1. Pipe fitting 2. Metal corrugated pipe

[0032] 3 metal mesh cover 4 lower concave part

[0033] 5 Expansion joint tooling Detailed Implementation

[0034] Various exemplary embodiments of the present invention will now be described in detail. This detailed description should not be considered as a limitation of the present invention, but rather as a more detailed description of certain aspects, features, and implementations of the present invention.

[0035] Various improvements and variations can be made to the specific embodiments described in this utility model without departing from the scope or spirit of this utility model, which will be obvious to those skilled in the art. Other embodiments derived from this utility model will be obvious to those skilled in the art. This application specification and embodiments are merely exemplary.

[0036] This utility model provides a connector structure for a liquid rocket propellant refueling pipeline. For example... Figure 1 and Figure 2 As shown, the structure includes a pipe connector 1, a corrugated metal pipe 2, and a metal mesh sleeve 3. The pipe connector 1 is a structure with open ends and internal flow channels. Inside the pipe connector 1, the outer wall of the corrugated metal pipe 2 is tightly connected to the inner wall of the pipe connector 1. The pipe connector 1 has a recessed portion 4 inside, which is recessed along the circumferential direction of the pipe connector 1 away from its axis. The portion of the corrugated metal pipe 2 that connects to the inner wall of the pipe connector 1 includes the portion that is tightly fitted to the surface of the recessed portion 4. The ends of the corrugated metal pipe 2 and the pipe connector 1 are welded together. The metal mesh sleeve 3 is fitted onto the outer wall surface of the pipe connector 1.

[0037] Specifically, the connector structure for a liquid rocket propellant refueling pipeline provided in this embodiment of the invention consists of a pipe connector 1, a metal bellows 2, and a metal mesh sleeve 3. By providing a recessed portion 4 inside the pipe connector 1, the recessed portion 4 is recessed along the circumferential direction of the pipe connector 1 away from its axis. This allows the portion of the metal bellows 2 connected to the inner wall of the pipe connector 1 to include a portion tightly fitted to the surface of the recessed portion 4. The recessed portion 4 increases the contact area between the outer wall of the metal bellows 1 and the inner wall of the pipe connector 1, resulting in a tighter connection between the two.

[0038] The connector structure of this application, through the tight connection between the outer wall of the metal bellows 2 and the inner wall of the connector 1, reduces the expansion and contraction of the metal bellows 2 within the connector 1, while ensuring rapid movement of the liquid medium within the connector, thereby increasing the liquid medium delivery efficiency. The end-to-end welding connection between the metal bellows 2 and the connector 1 ensures a tighter and more secure connection, preventing displacement between them. The metal mesh sleeve 2, fitted onto the outer wall surface of the connector 1, facilitates the connection between the metal bellows 2 and the connector 1, preventing impurities from entering the gap between them and ensuring propellant quality. The entire structure is stable and reliable, preventing cracking at the weld between the bellows and the connector due to increased bending stress caused by larger rotation angles during use, ensuring safe propellant loading and improving work efficiency.

[0039] It is worth mentioning that, in order to ensure that the metal mesh sleeve 3 is tightly connected and firmly fixed to the pipe joint 1, for example, the metal mesh sleeve 3 is welded to the outer wall of the pipe joint 1.

[0040] It should be noted that, in order to increase the contact area between the recessed portion 4 and the metal bellows 2, for example, the end face of the recessed portion 4 intersecting the axial direction of the pipe joint 1 is a curved structure. The curved structure can reduce the movement of the metal bellows 2 inside the pipe joint 1 along the inner wall of the pipe joint 1 (the recessed portion 4 is equivalent to a slot, which confines the portion of the metal bellows 2 corresponding to the recessed portion 4 within the slot).

[0041] In this embodiment, the arc value of the curved structure is 0.06π and 0.08π. Extensive experiments have shown that when the arc value of the curved structure is N, and 0π < N ≤ π, it not only facilitates the tight fit between the metal corrugated pipe 2 and the pipe joint 1, but also facilitates the processing of the pipe joint 1, thereby promoting the large-scale production and application of the joint structure.

[0042] Furthermore, the length of the pipe joint along its axial direction is A, and the distance from the center of the recess to the end of the pipe joint furthest from the metal bellows is B, where 1 / 4A ≤ B ≤ 3 / 4A. By providing a recess at an appropriate position on the pipe joint, the metal bellows can be more firmly attached to the inner wall of the pipe joint, improving its mechanical properties.

[0043] In addition, to ensure the safe use of the metal bellows 2 and to prevent it from breaking, for example, Figure 2 As shown in the cross-sectional view, the thickness of the metal corrugated pipe 2 is less than the thickness of the metal mesh sleeve 3. See also the cross-sectional view. Figure 2 In order to facilitate the connection between the metal mesh sleeve 3 and the pipe joint (the metal mesh sleeve 3 is welded to the outer wall of the pipe joint 1 along the circumferential outer surface), for example, the thickness of the metal mesh sleeve 3 is less than the thickness of the pipe joint 1.

[0044] In this embodiment, to prevent the water medium from corroding and rusting the metal corrugated pipe, for example, a waterproof layer is provided on the surface of the metal mesh sleeve 3. The waterproof layer is in close contact with the surface of the metal mesh sleeve 3, and the two are connected by an adhesive.

[0045] like Figure 1 , Figure 2 and Figure 3 As shown, in this embodiment, the portion where the metal bellows 2 and the surface of the recessed portion 4 are in close contact is obtained by providing an internal expansion joint 5, wherein the expansion joint 5 is used to tightly attach the metal bellows 2 and the recessed portion 4 together without gap.

[0046] In the specific process, the metal bellows 2 is first deformed by the expansion fitting 5, causing it to fit against the concave arc surface of the recessed portion on the pipe joint 1. For example, the expansion fitting 5 can be composed of an elastomer material (including but not limited to polyurethane, polyvinyl chloride, etc.) and a power cylinder (including but not limited to a pneumatic cylinder, hydraulic cylinder, etc.). The elastomer material is mounted on the piston rod of the power cylinder. When the power cylinder supplies power and retracts the piston rod, the elastomer material is compressed and undergoes elastic deformation, allowing the curved portion of the metal bellows 2 to extend and fit against the concave arc surface of the recessed portion. The elastic material, through pressure, ensures that the metal bellows fits well against the recessed portion of the pipe joint.

[0047] This utility model also provides a refueling pipeline, which is prepared from the above-mentioned joint structure for liquid rocket propellant refueling pipeline.

[0048] The above description is merely an illustrative embodiment of this utility model. Any equivalent changes and modifications made by those skilled in the art without departing from the concept and principles of this utility model shall fall within the scope of protection of this utility model.

Claims

1. A connector structure for a liquid rocket propellant refueling pipeline, characterized in that, It includes pipe fittings, corrugated metal pipes, and metal braided sleeves, among which, The pipe joint is a structure with two open ends and an internal flow channel. On the inner side of the pipe joint, the outer wall of the metal corrugated pipe is tightly connected to the inner wall of the pipe joint. The pipe joint has a recessed portion inside, which is recessed inward along the circumferential direction of the pipe joint to the side away from the axis of the pipe joint. The portion of the corrugated metal pipe connected to the inner wall of the pipe joint includes a portion that is in close contact with the surface of the recessed portion; the end of the corrugated metal pipe is welded to the pipe joint; and the metal mesh sleeve is fitted onto the outer wall surface of the pipe joint.

2. The connector structure for a liquid rocket propellant refueling pipeline according to claim 1, characterized in that, The metal mesh sleeve is welded to the outer wall of the pipe joint.

3. The connector structure for a liquid rocket propellant refueling pipeline according to claim 1, characterized in that, The end face of the recessed portion, which intersects the axial direction of the pipe joint, has a curved structure.

4. The connector structure for a liquid rocket propellant refueling pipeline according to claim 3, characterized in that, The radius of the curved structure is N, where 0π<N≤π.

5. The connector structure for a liquid rocket propellant refueling pipeline according to claim 1, characterized in that, The length of the pipe joint along the axial direction is A, and the distance from the center of the recess to the end of the pipe joint away from the metal bellows is B, and 1 / 4A≤B≤3 / 4A.

6. The connector structure for a liquid rocket propellant refueling pipeline according to claim 1, characterized in that, The thickness of the metal corrugated pipe is less than the thickness of the metal mesh sleeve.

7. The connector structure for a liquid rocket propellant refueling pipeline according to claim 6, characterized in that, The thickness of the metal mesh sleeve is less than the thickness of the pipe joint.

8. The connector structure for a liquid rocket propellant refueling pipeline according to claim 1, characterized in that, The surface of the metal mesh sleeve is provided with a waterproof layer, which is in close contact with the surface of the metal mesh sleeve and the two are connected by an adhesive.

9. The connector structure for a liquid rocket propellant refueling pipeline according to claim 1, characterized in that, The portion of the metal corrugated pipe that is in close contact with the surface of the recessed portion is obtained by an internal expansion joint tool, wherein the expansion joint tool is used to tightly attach the metal corrugated pipe and the recessed portion together without gap.

10. A filling pipeline, characterized in that, The invention comprises the preparation of a connector structure for a liquid rocket propellant refueling pipeline as described in any one of claims 1-9.

Images