Tunnel tube fixing structure

Abstract

The utility model relates to a kind of tunnel pipe fixing structure, it is used to fix the tunnel pipe in rocket common bottom storage tank.The tunnel pipe fixing structure includes: hoop, hoop is set on tunnel pipe;At least one pull rod, pull rod is the slender pole extending along the radial direction perpendicular to the axis of tunnel pipe, one end of pull rod is fixed in hoop, the other end of pull rod is fixed on the wall of storage tank, wherein, connecting lug is provided on hoop, one end of pull rod is connected with the connecting lug on hoop by fixed bolt.The tunnel pipe fixing structure of the utility model can provide the fixing and support in radial direction to tunnel pipe.

Description

Technical Field

[0001] This utility model relates to a tunnel tube fixing structure, which is used to fix the tunnel tube (especially the single-layer tunnel tube) in the common bottom tank of a launch vehicle. Background Technology

[0002] Rocket propellant tanks are the main structural component of a rocket, primarily used to store propellants. Rockets using bicomponent propellants may employ a common-bottom tank structure. Examples of rockets using bicomponent propellants include liquid oxygen-methane launch vehicles. In such a common-bottom tank structure, a single long tank is divided into two independent propellant tanks by the common bottom structure, each used to store a different component of the propellant.

[0003] To transport propellant from a propellant tank located far from the tank outlet to the outlet, a tunnel pipe can be installed connecting the common bottom of the tank to the outlet. A common type of tunnel pipe is a single-layer tunnel pipe. This type extends from the common bottom of the tank to the outlet within the tank's internal space. Because the tunnel pipe needs to be connected to the tank via a corrugated pipe, the overall structure of the tunnel pipe, including the corrugated pipe, resembles a cantilever beam.

[0004] Considering the conditions during rocket flight, the tunnel pipe will experience displacement and / or deformation in both the axial and radial directions, and this displacement and deformation are generally accompanied by vibration. The aforementioned axial direction refers to the longitudinal axis of the tunnel pipe, and the radial direction refers to the direction perpendicular to the longitudinal axis of the pipe.

[0005] The corrugated pipe is installed in the tunnel pipe to compensate for the axial deformation and displacement of the tunnel pipe; that is, a part of the tunnel pipe can be composed of corrugated pipe. The expansion and contraction of the corrugated pipe can absorb or release the axial displacement and / or deformation of the tunnel pipe. However, due to its inherent structural characteristics, the corrugated pipe has insufficient rigidity and deformation resistance in the radial direction. Radial deformation and displacement of the tunnel pipe can cause large bending moments at the common-bottom connection of the storage tank, leading to local instability of the common-bottom and making it prone to undesirable deformation or even damage. Utility Model Content

[0006] The purpose of this invention is to provide a tunnel pipe fixing structure that can provide radial fixing and support for the tunnel pipe.

[0007] To achieve the above objectives, the present invention provides the following solution.

[0008] According to one aspect of the present invention, a tunnel tube fixing structure is provided for fixing a tunnel tube in a rocket common-bottom propellant tank. The tunnel tube fixing structure includes: a ring clamp fitted onto the tunnel tube; at least one tie rod, the tie rod being an elongated rod extending in a radial direction perpendicular to the axis of the tunnel tube, one end of the tie rod being fixed to the ring clamp, and the other end of the tie rod being fixed to the wall of the propellant tank, wherein the ring clamp is provided with a connecting lug, and the one end of the tie rod is connected to the connecting lug on the ring clamp by a fixing bolt.

[0009] In the tunnel pipe fixing structure of this utility model, the tie rod is connected radially between the tunnel pipe and the tank wall. Therefore, the radial deformation and displacement of the tunnel pipe are constrained by the tie rod, reducing or even eliminating the bending moment that may occur at the common bottom connection of the tunnel pipe and the tank, thereby avoiding local instability on the common bottom of the tank. Here, unless otherwise specified, the term "instability" refers to the buckling of a member after being compressed because it cannot withstand the pressure. In addition, by setting a hoop as the connection medium between the tie rod and the tunnel pipe, the tensile force and / or compressive force on the tie rod will first be dispersed circumferentially in the hoop before acting on the entire circumference of the tunnel pipe. This avoids the risk of excessive local stress on the tunnel pipe caused by the tie rod being directly connected to the tunnel pipe. Furthermore, the hoop can be quickly fitted onto the tunnel pipe without damaging it.

[0010] According to one embodiment of the present invention, the tunnel pipe fixing structure includes three tie rods, and the three tie rods are distributed at equal angular intervals to each other in a plane perpendicular to the axis of the tunnel pipe with the ring hoop as the center.

[0011] The function of the tie rods is to constrain the radial deformation and displacement of the tunnel tube; therefore, a single tie rod can provide significant constraint. However, considering stability—that is, to provide good constraint in all directions—it is desirable to have two, three, four, or even more tie rods, evenly distributed circumferentially. On the other hand, to minimize the overall weight of the rocket, a large number of tie rods is not desirable. To balance stability and weight reduction, three tie rods distributed at equal angular intervals are ideal.

[0012] According to one embodiment of the present invention, a waist hole is provided on one of the connecting lug on the ring and one end of the pull rod, the waist hole allowing the fixing bolt inserted into the waist hole to move in the radial direction.

[0013] The structural features of the waist hole allow the fixing bolt to move in a predetermined direction within it. Therefore, in the above configuration, even with one end of the tie rod fixed to the connecting lug on the ring clamp, it can still move to a certain extent in the radial direction. This movement allowed by the waist hole can counteract some radial deformation and / or displacement of the tunnel pipe, and in particular, effectively counteract some vibration.

[0014] According to one embodiment of the present invention, the tunnel pipe fixing structure further includes a reinforcing plate, which is used to fix the other end of the tie rod to the wall of the storage tank. The inner circumferential surface of the reinforcing plate is provided with a first connecting piece, and a connecting lug for connecting to the other end of the tie rod is provided on the first connecting piece. The connecting lug is connected to the other end of the tie rod by a fixing bolt, and the reinforcing plate is fixed to the wall of the storage tank by at least one second connecting piece.

[0015] By using a reinforcing plate as a connection medium between the tie rod and the tank wall, the tensile force and / or compressive force on the tie rod will first be dispersed in the reinforcing plate before being transmitted to the tank wall. This avoids the risk of excessive local stress on the wall caused by the tie rod being directly connected to the tank wall.

[0016] According to one embodiment of the present invention, a waist hole is provided on one of the connecting lugs on the first connecting piece and the other end of the pull rod, the waist hole allowing a fixing bolt inserted into the waist hole to move in the radial direction.

[0017] The movement allowed by the waist hole can counteract a portion of the radial deformation and / or displacement of the other end of the tie rod, and in particular, can effectively counteract a portion of the vibration, thereby reducing the amount of radial deformation and / or displacement transmitted by the tie rod to the tank wall, thus better protecting the tank wall.

[0018] According to one embodiment of the present invention, the pull rod is a slender rod with an L-shaped cross-section.

[0019] The L-shaped cross-section can improve the bending strength of the tie rod, thus making it less prone to breakage.

[0020] According to one embodiment of the present invention, the pull rod is a slender rod with a flat, straight cross-section.

[0021] Tie rods with a straight cross-section are prone to bending or twisting deformations under stress, a condition known as "instability." While instability can lead to twisting and breakage, it can be viewed as introducing damping relative to the vibration load. This reduces the load on the tie rod when subjected to vibration, thus helping to protect the walls of the tunnel pipe and storage tank.

[0022] According to one embodiment of the present invention, one end of the pull rod is provided with a thickened portion, and the waist hole is disposed in the thickened portion. According to one embodiment of the present invention, the other end of the pull rod is provided with a thickened portion, and the waist hole is disposed in the thickened portion.

[0023] The thickened portion at the end of the tie rod has higher resistance to compression. Therefore, the structure in which the waist hole is located in the thickened portion can better maintain shape stability under pressure load and avoid significant instability at the pressure position at the end.

[0024] According to one embodiment of the present invention, a corrugated pipe is provided in the tunnel pipe, and the ring is provided near the corrugated pipe.

[0025] Corrugated pipes have weak rigidity and resistance to deformation in the radial direction. Therefore, placing a ring around the corrugated pipe can effectively provide radial support for the tunnel pipe.

[0026] This utility model has at least the following technical effects: the tunnel pipe fixing structure provided by this utility model can provide radial fixing and support for the tunnel pipe. Furthermore, in other embodiments of this utility model, further advantageous effects are provided. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic perspective view of the tunnel pipe fixing structure according to the embodiment.

[0029] Figure 2 This is a schematic perspective view of the connection structure between the tie rod and the storage tank of the tunnel pipe fixing structure according to the embodiment.

[0030] Figure 3This is a schematic perspective view of the connection structure between the tie rod and the tunnel pipe in the tunnel pipe fixing structure according to the embodiment.

[0031] Explanation of reference numerals in the attached figures: 10. Tunnel pipe; 11. Tunnel pipe body; 12. Corrugated pipe; 13. First pipe joint; 14. Second pipe joint; 20. Tie rod; 21. Thickened part; 22. Waist hole; 30. Ring hoop; 31. Locking bolt; 32. Connecting piece; 33. Fixing bolt; 40. Wall; 41. Rib; 50. Reinforcing plate; 51. First connecting piece; 52. Second connecting piece; 53. Fixing bolt. Detailed Implementation

[0032] The features and exemplary embodiments of various aspects of this utility model will be described in detail below. To make the objectives, technical solutions, and advantages of this utility model clearer, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only configured to explain this utility model and to exemplarily illustrate the principles of this utility model, and are not configured to limit this utility model. In addition, the structural components in the drawings are not necessarily drawn to scale. For example, the dimensions of some structural components or regions in the drawings may be enlarged for other structural components or regions to aid in the understanding of the embodiments of this utility model.

[0033] The directional terms used in the following description refer to the directions shown in the figures and are not intended to limit the specific structure of the embodiments of this utility model. In the description of this utility model, it should be noted that, unless otherwise stated, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0034] Furthermore, the terms "comprising," "including," "having," or any other variations thereof are intended to cover non-exclusive inclusion, such that a structure or component that includes a list of elements includes not only those elements but also other structural elements that are not expressly listed or inherent to the structure or component. Without further limitations, an element defined by the phrase "comprising..." does not exclude the presence of other identical elements in the article or apparatus that includes the element.

[0035] Spatial relation terms such as "below," "under," "under," "low," "above," "on," and "high" are used for descriptive convenience to explain the positioning of one element relative to a second element, indicating that these terms are intended to cover different orientations of the device, in addition to those different from those shown in the figure. Furthermore, phrases such as "one element on / below another element" can indicate that two elements are in direct contact, or that there are other elements between the two elements. In addition, terms such as "first" and "second" are also used to describe individual elements, areas, parts, etc., without specifically indicating order or sequence, and should not be considered restrictive. Similar terms are used throughout the description to represent similar elements.

[0036] For those skilled in the art, this invention can be implemented without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the invention by illustrating examples.

[0037] In this embodiment, there may be descriptions such as "staff". Those skilled in the art should understand that the description of "staff" is only for the convenience of describing the embodiments of this utility model. It is just an exemplary general concept and is not specifically limited to a particular person.

[0038] In the following description, the common-bottom tank structure used in rockets employing bicomponent propellants is used as an example. Unless otherwise specified, the term "tunnel tube" refers to a single-layer tunnel tube in a common-bottom tank structure.

[0039] First Embodiment Figure 1 A schematic diagram of the tunnel pipe fixing structure according to the first embodiment installed on the tunnel pipe 10 is shown. Hereinafter, the axial direction of the tunnel pipe 10 will be simply referred to as the "axial direction", the radial direction perpendicular to the axial direction of the tunnel pipe 10 will be simply referred to as the "radial direction", and the circumferential direction around the tunnel pipe 10 will be simply referred to as the "circumferential direction". The tunnel pipe 10 includes a tunnel pipe body 11, a corrugated pipe 12, a first pipe joint 13, and a second pipe joint 14. One of the first pipe joint 13 and the second pipe joint 14 can be connected to the common bottom of the storage tank, and the other of the first pipe joint 13 and the second pipe joint 14 can be connected to the outlet of the storage tank.

[0040] like Figures 1 to 3As shown, the tunnel pipe fixing structure may include a tie rod 20, a hoop 30, and a reinforcing plate 50. The hoop 30 serves as a connecting medium between the tie rod 20 and the tunnel pipe 10, and the reinforcing plate 50 serves as a connecting medium between the tie rod 20 and the tank wall 40. The tie rod 20 is an elongated rod extending radially. The inner end of the tie rod 20 in the radial direction is connected to the hoop 30, and the outer end of the tie rod 20 in the radial direction is connected to the reinforcing plate 50. Figure 1 The diagram shows the distribution of the three tie rods 20 at equal angular intervals in the circumferential direction. In other words, the angle between any two tie rods 20 in a plane centered on the ring 30 and perpendicular to the axial direction is 120°.

[0041] like Figure 1 and Figure 3 As shown, the hoop 30 is fitted onto the tunnel pipe body 11 near the corrugated pipe 12. Once the hoop 30 is in place, it can be secured to the tunnel pipe body 11 using locking bolts 31 and nuts. A connecting piece 32 is provided on the hoop 30, which can be welded to the hoop 30, for example. A connecting lug is provided on the connecting piece 32, which can be welded to the connecting piece 32 or formed as an integral structure with it.

[0042] The connecting lugs on the connecting piece 32 and the inner ends of the pull rod 20 in the radial direction are both provided with holes so that the connecting lugs on the connecting piece 32 and the inner ends of the pull rod 20 in the radial direction can be fixed together by the fixing bolts 33. Figure 3 The diagram shows a waist hole 22 located on the inner end of the tie rod 20 in the radial direction. However, it is not limited to this; the waist hole may also be located in the connecting lug on the connecting piece 32.

[0043] exist Figure 3 In this design, the orientation of the slot 22 is designed to allow the fixing bolt 33 inserted in the slot 22 to move in the radial direction. The fixing bolt 33 can be tightened with a lock nut, but it is not necessary to tighten the lock nut to its maximum extent during installation. Instead, the lock nut is secured to the fixing bolt 33 in such a way that the fixing bolt 33 is allowed to move in the radial direction in the slot 22 when the tension or pressure on the tie rod 20 exceeds a certain level.

[0044] like Figure 2 As shown, the outer end of the tie rod 20 in the radial direction is connected to the reinforcing plate 50. A first connecting piece 51 is provided on the inner circumferential surface of the reinforcing plate 50 (i.e., the surface facing the inner side in the radial direction). The first connecting piece 51 can be welded to the reinforcing plate 50, for example. A connecting lug is provided on the first connecting piece 51, which can be welded to the first connecting piece 51 or integrally formed with the first connecting piece 51, for example. Figure 2In this tank, an annular frame with an opening towards the inner periphery has already been formed on the wall 40. To minimize weight, a reinforcing plate 50 can be placed on this existing annular frame, and the shape of the reinforcing plate 50 can be designed as an annular frame with an opening towards the outer periphery. Figure 2 As shown, when the reinforcing plate 50, which has an annular frame shape, is fitted with an annular frame on the wall 40 of the tank, a structure similar to a hollow beam is formed. The reinforcing plate 50 does not need to be a complete ring extending along the entire circumference; it can be segmented, as long as it serves the desired connecting function. For example, Figure 2 The circumferential extension of the reinforcing plate 50 can correspond to a central angle of 5°. It should be noted that if there is no annular frame on the tank wall 40, the construction of the reinforcing plate 50 is not limited to... Figure 2 As shown in the figure. Those skilled in the art can employ reinforcing plates 50 with other structural forms, provided that the technical objectives of this utility model are met.

[0045] The connecting lugs on the first connecting piece 51 and the outer ends of the pull rod 20 in the radial direction are both provided with holes so that the connecting lugs on the first connecting piece 51 and the outer ends of the pull rod 20 in the radial direction can be fixed together by fixing bolts 53. Figure 2 The diagram shows a waist hole 22 located on the outer end of the pull rod 20 in the radial direction, but it is not limited to this. The waist hole may also be located in the connecting lug on the first connecting piece 51.

[0046] exist Figure 2 In this design, the orientation of the slot 22 is designed to allow the fixing bolt 53 inserted in the slot 22 to move in the radial direction. The fixing bolt 53 can be tightened with a lock nut, but it is not necessary to tighten the lock nut to its maximum extent during installation. Instead, the lock nut is secured to the fixing bolt 53 in such a way that the fixing bolt 53 is allowed to move in the radial direction in the slot 22 when the tension or pressure on the tie rod 20 exceeds a certain level.

[0047] The reinforcing plate 50 is fixed to the wall 40 of the tank by multiple second connecting pieces 52. Figure 2 The second connecting piece 52 shown is an L-shaped right-angled bend, but its shape is not limited to this; it can be any shape as long as the desired connection effect is achieved. Figure 2 In the tank, the wall 40 is provided with multiple ribs 41, and the second connecting piece 52 connects the reinforcing plate 50 and the ribs 41 together. For example, the second connecting piece 52 can be welded to the reinforcing plate 50 and the ribs 41.

[0048] like Figure 2 and Figure 3As shown, the tie rod 20 is a slender rod with a flat, straight cross-section. To ensure the connection rigidity at the inner and outer ends of the tie rod 20 in the radial direction, a thickened portion 21 is provided at both the inner and outer ends of the tie rod 20 in the radial direction, and a waist hole 22 is provided in the thickened portion 21.

[0049] The main radial loads generated on the tunnel tube 10 include vibration loads and overload components. The tie rod 20 is a slender rod with a cross-sectional dimension much smaller than the radius of the propellant tank. This means that the tie rod 20 is extremely prone to instability under compression, has limited load-bearing capacity, and is almost incapable of withstanding compression. Furthermore, its straight cross-section is also prone to instability under pressure. Therefore, the tie rod 20 with its straight cross-section can only bear a low overload component (i.e., low static load-bearing capacity). However, the instability of the tie rod 20 under compression helps absorb vibration loads (i.e., higher dynamic load-bearing capacity). Therefore, provided the overload component does not cause the tie rod 20 to break, the instability of the tie rod 20 can be used to effectively absorb vibration loads, thereby achieving the expected support and fixation function and protecting the common bottom of the tunnel tube and propellant tank from accidents during rocket operation.

[0050] Second Embodiment The difference between this embodiment and the first embodiment is that the tie rod 20 is designed as a slender rod with an L-shaped cross-section. This difference will be emphasized below, and descriptions of content identical to that in the first embodiment will be omitted.

[0051] Compared to a straight cross-section, an L-shaped slender rod has stronger bending strength and can therefore withstand a higher overload component (i.e., higher static load-bearing capacity), but it is less prone to instability under pressure (i.e., lower dynamic load-bearing capacity). Therefore, compared to a straight cross-section slender rod, an L-shaped cross-section slender rod is less likely to break, but it is weaker in absorbing vibration loads.

[0052] For example, in a vibration verification test simulating rocket operation, under the same conditions, the response frequency measured on the slender rod with an L-shaped cross-section was 41.8 Hz and the vibration response acceleration was 22.5 g, while the response frequency measured on the slender rod with a straight cross-section was 41.7 Hz and the vibration response acceleration was 14.6 g. That is to say, under the same vibration conditions, the load generated in the slender rod with a straight cross-section decreased by approximately 33%.

[0053] The tunnel tube fixing structures in both of the above embodiments can provide radial support and fixation for the tunnel tube as desired, and therefore can be applied to rocket propellant tank designs with large dimensions. For example, the tunnel tube fixing structure of this invention can be applied to tunnel tubes with a length of 14 meters or more.

[0054] Furthermore, without affecting the technical effect of this utility model, the above two embodiments can also be combined with each other. For example, in the tunnel pipe fixing structure, a portion of the tie rods 20 can be designed as the tie rods 20 with a straight cross section in the first embodiment, and another portion of the tie rods 20 can be designed as the tie rods 20 with an L-shaped cross section in the second embodiment.

[0055] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A tunnel tube fixing structure for fixing a tunnel tube in a common base tank of a rocket, characterized by, The tunnel pipe fixing structure includes: A ring clamp, which is fitted onto the tunnel pipe; At least one tie rod, said tie rod being an elongated rod extending in a radial direction perpendicular to the axis of the tunnel pipe, one end of said tie rod being fixed to the ring clamp, and the other end of said tie rod being fixed to the wall of the storage tank, wherein, The ring is provided with a connecting lug, and one end of the pull rod is connected to the connecting lug on the ring by a fixing bolt.

2. The tunnel pipe fixing structure according to claim 1, characterized in that, The tunnel pipe fixing structure includes three tie rods, and the three tie rods are distributed at equal angular intervals with respect to each other in a plane perpendicular to the axis of the tunnel pipe, with the ring hoop as the center.

3. The tunnel pipe fixing structure according to claim 1 or 2, characterized in that, A waist hole is provided on one of the connecting lugs on the ring and one end of the pull rod, the waist hole allowing the fixing bolt inserted into the waist hole to move in the radial direction.

4. The tunnel pipe fixing structure according to claim 1 or 2, characterized in that, The tunnel pipe fixing structure also includes a reinforcing plate, which is used to fix the other end of the tie rod to the wall of the storage tank. The inner circumferential surface of the reinforcing plate is provided with a first connecting piece, and the first connecting piece is provided with a connecting lug for connecting to the other end of the tie rod. This connecting lug is connected to the other end of the tie rod by a fixing bolt. The reinforcing plate is fixed to the wall of the tank by at least one second connecting piece.

5. The tunnel pipe fixing structure according to claim 4, characterized in that, A waist hole is provided on one of the connecting lugs on the first connecting piece and the other end of the pull rod, the waist hole allowing a fixing bolt inserted into the waist hole to move in the radial direction.

6. The tunnel pipe fixing structure according to claim 1 or 2, characterized in that, The tie rod is a slender rod with an L-shaped cross-section.

7. The tunnel pipe fixing structure according to claim 1 or 2, characterized in that, The tie rod is a slender rod with a flat, straight cross-section.

8. The tunnel pipe fixing structure according to claim 3, characterized in that, One end of the pull rod is provided with a thickened portion, and The waist hole is located in the thickened part.

9. The tunnel pipe fixing structure according to claim 5, characterized in that, The other end of the pull rod is provided with a thickened portion, and The waist hole is located in the thickened part.

10. The tunnel pipe fixing structure according to claim 1 or 2, characterized in that, The tunnel pipe is equipped with a corrugated pipe, and The ring is positioned close to the bellows.

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