An energy dissipator for the lower tank of a downwardly convex common-bottom storage tank

Abstract

An energy dissipator for the lower tank of a downwardly convex common-bottom storage tank provided by the present invention includes: a connection part adapted to be connected to a pressurization port provided on the side wall of the storage tank, and a first channel adapted for pressurized gas to pass through is provided in the connection part; a main body structure connected to the connection part, a second channel communicating with the first channel is provided in the main body structure, the main body structure extends in the circumferential direction of the storage tank, at least one end of the main body structure is provided with a sieve hole, and the setting of the sieve hole utilizes the principle of silencing by a group of small holes to reduce energy, reduce noise, and equalize the flow velocity. Since the main body structure extends in the circumferential direction of the storage tank, the outlet direction of the gas is perpendicular to the axial direction of the storage tank, which can ensure the smoothness of the liquid level in the storage tank, will not cause impact on the liquid level, the pressure above the liquid level is uniform, and the shape of the main body structure is suitable for the installation of the lower tank of the downwardly convex common-bottom storage tank.

Description

Technical Field

[0001] The present invention relates to the technical field of tank propellant management elements, and in particular to an energy dissipator for a lower tank of a downward convex common bottom tank. Background Art

[0002] The energy dissipator is one of the propellant management components in the propellant tank. Its main function is to maintain the stability of the liquid level and the tank pressure to ensure the normal operation of the propellant in the engine system.

[0003] The propellant of a liquid rocket is stored in a fuel tank and introduced into the combustion chamber through a delivery pipe at the bottom for mixing and reaction, generating energy to give the rocket an upward thrust. However, as the fuel is consumed, the liquid level in the tank gradually drops, the air cushion above the fuel level increases, and the internal pressure becomes lower and lower. In order to ensure the continuity and stability of the fuel supply, it is necessary to inject high-pressure gas into the air cushion to compensate for the decrease in air pressure caused by the drop in the liquid level, and to ensure the continuous delivery and discharge of liquid fuel. However, it is extremely disadvantageous for high-speed pressurized air to rush into the tank because:

[0004] (1) The cryogenic propellant blown by the airflow vaporizes in the air pillow and absorbs heat, causing the temperature of the pressurized gas to drop, thereby reducing the boost pressure value;

[0005] (2) Under low gravity during the gliding phase, the liquid surface is easily disturbed, which can form vortices and "leakage" of propellant outflow.

[0006] Therefore, it is necessary to install an energy dissipator at the boost port to reduce the outlet velocity of the boost airflow (generally 500m / s) to the required velocity (less than 5m / s) within a limited distance to reduce the disturbance to the liquid surface. In addition, the airflow can enter the air pillow space evenly to stabilize the liquid surface and make the pressure uniform.

[0007] The conventional tank drum screen boost energy absorber has a secondary expansion at the inlet to reduce the flow rate. At the same time, it adopts a multi-layer perforated plate and a central honeycomb barrel design so that the boosted gas eventually tends to be parallel to the tank axis, and does not blow directly to cause liquid splashing. However, this structure has a large number of parts, and the entire structure is only suitable for installation on the top of the air pillow. The structure occupies a large space. The drum screen energy absorber cannot adapt to situations where the installation space is narrow and there are special requirements for the outflow direction of the airflow.

[0008] For example, for the lower tank of a downwardly convex common-bottom tank, if the above-mentioned cylindrical sieve type energy dissipator is adopted, gas needs to be introduced into the gas pillow axially upward from the rear bottom through a pressurizing pipe. If the length of the cylindrical section is long, the installation and fixation of the pressurizing pipe inside the tank will be very complicated, and the stability problem of the long pipe needs to be considered; if it is high-temperature pressurized gas, double-layer pipeline heat insulation is also required to prevent the pressurized gas from exchanging heat with the propellant in the long pipeline, resulting in heat loss. At the same time, due to the limitation of the opening space of the rear bottom flange, the height of the energy dissipator extending into the common-bottom gas pillow is limited, and the energy dissipator is relatively close to the liquid level, greatly reducing the energy dissipation effect. If the pressurizing port is opened on the side wall of the tank, there is a sufficient distance from the filling liquid level, which can decelerate the high-speed air flow well. However, if the traditional cylindrical sieve type energy dissipator is adopted, the installation space cannot meet the requirements. If the size is reduced, the flow area will also be reduced accordingly, and the deceleration effect on the pressurized gas will also be weakened, and the requirement for circumferential flat blowing of the air flow direction cannot be met either. Summary of the Invention

[0009] Therefore, the technical problem to be solved by the present invention is to overcome the defect that the existing energy dissipator cannot be applied to the lower tank of a downwardly convex common-bottom tank, so as to provide an energy dissipator for the lower tank of a downwardly convex common-bottom tank.

[0010] To solve the above technical problem, an energy dissipator for the lower tank of a downwardly convex common-bottom tank provided by the present invention includes:

[0011] A connecting portion adapted to be connected to a pressurizing port provided on the side wall of the tank, and a first channel adapted for the pressurized gas to pass through is provided in the connecting portion;

[0012] A main body structure connected to the connecting portion, a second channel communicating with the first channel is provided in the main body structure, the main body structure extends in the circumferential direction of the tank, and at least one end of the main body structure is provided with sieve holes.

[0013] The cross-sectional area of the second channel is larger than the cross-sectional area of the first channel.

[0014] The main body structure is in an arc shape.

[0015] The main body structure includes a first energy dissipation component, the first energy dissipation component includes a first pipe and first end caps provided at both ends of the first pipe, and sieve holes are provided on the first end caps.

[0016] Sieve holes are provided on the first pipe at least at a position close to the side wall of the tank.

[0017] The main body structure further includes a second energy dissipation component surrounding the outside of the first energy dissipation component, the second energy dissipation component includes a second pipe and second end caps provided at both ends of the second pipe, and sieve holes are provided on the second end caps.

[0018] The sieve holes on the second cover are oblong.

[0019] The first pipe includes a first pipe wall close to the side wall of the storage tank, a second pipe wall opposite to the first pipe wall, a third pipe wall connecting the upper ends of the first pipe wall and the second pipe wall, and a fourth pipe wall connecting the lower ends of the first pipe wall and the second pipe wall. Sieve holes are provided on the first pipe wall, the third pipe wall, and the fourth pipe wall.

[0020] The cross-section of the second pipe is C-shaped and is hermetically connected to the outer surface of the second pipe wall.

[0021] The second pipe includes a fifth pipe wall close to the side wall of the storage tank. There is a gap between the fifth pipe wall and the side wall, and sieve holes are provided on the fifth pipe wall.

[0022] The first pipe is formed by bending and welding a flat plate with sieve holes.

[0023] The second pipe is formed by bending a flat plate with sieve holes, and the second pipe is welded to the first pipe.

[0024] The connecting part includes a flange plate adapted to be fixedly connected to the side wall and a connecting sleeve passing through the through hole on the flange plate. The connecting sleeve is connected to the main body structure.

[0025] The flange plate is welded to the connecting sleeve.

[0026] The technical solution of the present invention has the following advantages:

[0027] 1. An energy dissipator for the lower tank of a downwardly convex common bottom storage tank provided by the present invention. By opening a pressurizing port on the side wall of the storage tank, the energy dissipator is connected to the side wall of the storage tank through a connecting part. The pressurized gas enters the second channel in the main body structure through the first channel and finally diffuses out through the sieve holes on the end of the main body structure. The setting of the sieve holes utilizes the principle of sound attenuation by a group of small holes to reduce energy, reduce noise, and equalize the flow velocity. Since the main body structure extends in the circumferential direction of the storage tank, the outlet direction of the gas is perpendicular to the axial direction of the storage tank, which can ensure the stability of the liquid level in the storage tank, will not cause impact on the liquid level, the pressure above the liquid level is uniform, and the shape of the main body structure is suitable for the installation of the lower tank of the downwardly convex common bottom storage tank.

[0028] 2. An energy dissipator for the lower tank of a downwardly convex common bottom storage tank provided by the present invention. The cross-sectional area of the second channel is larger than that of the first channel, which increases the flow area of the pressurized gas and reduces its speed.

[0029] 3. A damper for the lower tank of a downwardly convex common-bottom storage tank provided by the present invention, the main structure of which is arc-shaped and adapted to the shapes of the storage tank and the common bottom, can make full use of the installation space between the storage tank and the common bottom, and is applicable to the installation of the lower tank of the downwardly convex common-bottom storage tank.

[0030] 4. A damper for the lower tank of a downwardly convex common-bottom storage tank provided by the present invention, the main structure of which includes a first damping component, the first damping component includes a first pipe, and first end caps provided at both ends of the first pipe, and the first end caps are provided with sieve holes, with simple structure and convenient connection.

[0031] 5. A damper for the lower tank of a downwardly convex common-bottom storage tank provided by the present invention, at least at a position close to the side wall of the storage tank on the first pipe, sieve holes are provided, and gas can diffuse outwards through this position. Since this position has a large area, it can increase the flow area of the pressurized gas, reduce its speed, and utilize the principle of noise reduction by a group of small holes to reduce energy, reduce noise, and make the flow rate uniform, so that the diffused high-pressure gas has a uniform and low speed.

[0032] 6. A damper for the lower tank of a downwardly convex common-bottom storage tank provided by the present invention, the main structure further includes a second damping component surrounding the outside of the first damping component, the second damping component includes a second pipe, and second end caps provided at both ends of the second pipe, and the second end caps are provided with sieve holes. When the gas diffuses, it first passes through the sieve holes on the first end cap and then through the sieve holes on the second end cap, diffusing layer by layer, and the speed continuously decreases and becomes more and more uniform during the diffusion process.

[0033] 7. A damper for the lower tank of a downwardly convex common-bottom storage tank provided by the present invention, the sieve holes on the second end cap are oblong, ensuring the flow area of the gas.

[0034] 8. A damper for the lower tank of a downwardly convex common-bottom storage tank provided by the present invention, the first pipe includes a first pipe wall close to the side wall of the storage tank, a second pipe wall opposite to the first pipe wall, a third pipe wall connecting the upper ends of the first pipe wall and the second pipe wall, and a fourth pipe wall connecting the lower ends of the first pipe wall and the second pipe wall. Sieve holes are provided on the first pipe wall, the third pipe wall, and the fourth pipe wall. After the gas enters the second channel, it diffuses outwards through the first pipe wall, the third pipe wall, and the fourth pipe wall respectively, and finally diffuses out through the sieve holes at both ends. After passing through multiple sieve holes, the flow area of the gas is increased, the diffusion path of the gas is extended, and the energy dissipation effect is better. And no sieve holes are provided on the second pipe wall, which can avoid the gas transferring heat to the common bottom and causing the temperature of the common bottom to rise, and finally causing the propellant to gasify.

[0035] 9. An energy dissipator for the lower tank of a downwardly convex common-bottom storage tank provided by the present invention, wherein the cross-section of the second pipe is C-shaped and is hermetically connected to the outer surface of the second pipe wall, reducing the cross-sectional area of the main structure, so that the energy dissipator can be applied to the installation in a narrow space.

[0036] 10. An energy dissipator for the lower tank of a downwardly convex common-bottom storage tank provided by the present invention, wherein the second pipe includes a fifth pipe wall close to the side wall of the storage tank, there is a gap between the fifth pipe wall and the side wall, and sieve holes are provided on the fifth pipe wall. After the gas diffuses through the first pipe, it further diffuses outward through the fifth pipe wall, further extending the diffusion path of the gas. And during the diffusion process, using the principle of silencing by a group of small holes to reduce energy, reduce noise, and make the flow velocity uniform, so that the flow velocity of the diffused high-pressure gas is uniform and relatively low.

[0037] 11. An energy dissipator for the lower tank of a downwardly convex common-bottom storage tank provided by the present invention, wherein the first pipe is formed by bending and welding a flat plate with sieve holes, and standard flat plates with sieve holes can be purchased for processing, which is convenient for processing, and the processing cycle and cost of the product are relatively low.

[0038] 12. An energy dissipator for the lower tank of a downwardly convex common-bottom storage tank provided by the present invention, wherein the second pipe is formed by bending a flat plate with sieve holes, and the second pipe is welded to the first pipe. Standard flat plates with sieve holes can be purchased to process the second pipe, which is convenient for processing, and the processing cycle and cost of the product are relatively low. The second pipe is welded to the first pipe, and both the sealing performance and the connection reliability are good. And the weld formed by welding is located on the outer surface, which is easy to detect. After being welded into one body, it is convenient to assemble with other components.

[0039] 13. An energy dissipator for the lower tank of a downwardly convex common-bottom storage tank provided by the present invention, wherein the connecting part includes a flange plate adapted to be fixedly connected to the side wall and a connecting sleeve passing through the through hole on the flange plate, and the connecting sleeve is connected to the main structure, which is convenient for connecting the connecting part to the main structure.

[0040] 14. An energy dissipator for the lower tank of a downwardly convex common-bottom storage tank provided by the present invention, wherein the flange plate is welded to the connecting sleeve, and flange plates and sleeves with suitable sizes can be directly purchased, shortening the production cycle and reducing the production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0042] Figure 1 Schematic structural diagram of a shock absorber for the lower box of a downwardly convex common-bottom storage tank provided in the first embodiment of the present invention;

[0043] Figure 2 For Figure 1 Exploded view of a shock absorber for the lower box of a downwardly convex common-bottom storage tank as shown;

[0044] Figure 3 For Figure 1 Cross-sectional view of a shock absorber for the lower box of a downwardly convex common-bottom storage tank as shown;

[0045] Figure 4 For Figure 3 Schematic structural diagram from another angle of ;

[0046] Figure 5 For Figure 1 Schematic structural diagram of the second plug cover of a shock absorber for the lower box of a downwardly convex common-bottom storage tank as shown;

[0047] Description of reference numerals:

[0048] 1 - connecting part; 2 - main body structure; 3 - first channel; 4 - second channel; 5 - first pipe; 6 - second pipe; 7 - first plug cover; 8 - second plug cover; 11 - flange; 12 - sleeve; 51 - first pipe wall; 52 - second pipe wall; 53 - third pipe wall; 54 - fourth pipe wall; 61 - fifth pipe wall. Detailed implementation manners

[0049] Next, the technical solutions of the present invention will be clearly and completely described in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0050] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0051] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "linkage" 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 mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0052] In addition, the technical features involved in different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0053] Embodiment 1

[0054] This embodiment provides a specific implementation manner of a shock absorber for the lower box of a downwardly convex common-bottom storage tank, as Figures 1 to 5 shown, including a connection part 1 and a main body structure 2. The connection part 1 is adapted to be connected to a pressurization port provided on the side wall of the storage tank, and a first channel 3 for the passage of pressurized gas is provided in the connection part 1; the main body structure 2 is connected to the connection part 1, and a second channel 4 communicating with the first channel 3 is provided in the main body structure 2. The main body structure 2 extends in the circumferential direction of the storage tank, and at least one end of the main body structure 2 is provided with sieve holes.

[0055] The cross-sectional area of the second channel 4 is larger than that of the first channel 3, which can increase the flow area of the pressurized gas and reduce its speed.

[0056] As Figure 1 shown, the main body structure 2 is in an arc shape and is adapted to the shapes of the storage tank and the common bottom, which can make full use of the installation space between the storage tank and the common bottom.

[0057] The main body structure 2 includes a first shock-absorbing component, and the first shock-absorbing component includes a first pipe 5 and first end caps 7 provided at both ends of the first pipe 5. Sieve holes are provided on the first end caps 7, and the structure is simple and the connection is convenient.

[0058] Sieve holes are provided on the first pipe 5 at least at a position close to the side wall of the storage tank. Gas can diffuse outward through this position. Since this position has a large area, it can increase the flow area of the pressurized gas, reduce its speed, and use the principle of sound absorption by a group of small holes to reduce energy, reduce noise, and make the flow rate uniform, so that the high-pressure gas diffused out has a uniform and low speed.

[0059] The main body structure 2 further includes a second energy dissipation component surrounding the first energy dissipation component. The second energy dissipation component includes a second pipeline 6 and second end caps 8 provided at both ends of the second pipeline 6. The second end caps 8 are provided with sieve holes. When the gas diffuses, it first passes through the sieve holes on the first end cap 7 and then through the sieve holes on the second end cap 8, diffusing layer by layer. During the diffusion process, the speed continuously decreases and becomes more and more uniform.

[0060] In this embodiment, as Figure 5 shown, the sieve holes on the second end cap 8 are oblong, ensuring the gas flow area. Of course, in alternative embodiments, the shape of the sieve holes can be circular or other shapes.

[0061] The first pipeline 5 includes a first pipe wall 51 close to the side wall of the storage tank, a second pipe wall 52 opposite to the first pipe wall 51, a third pipe wall 53 connecting the upper ends of the first pipe wall 51 and the second pipe wall 52, and a fourth pipe wall 54 connecting the lower ends of the first pipe wall 51 and the second pipe wall 52. Sieve holes are provided on the first pipe wall 51, the third pipe wall 53, and the fourth pipe wall 54. After the gas enters the second channel 4, it diffuses outward through the first pipe wall 51, the third pipe wall 53, and the fourth pipe wall 54 respectively, and finally diffuses out through the sieve holes at both ends. After passing through multiple sieve holes, the gas flow area is increased, the gas diffusion path is extended, the energy dissipation effect is better, and no sieve holes are provided on the second pipe wall 52, which can prevent the gas from transferring heat to the common bottom and causing the temperature of the common bottom to rise, ultimately causing the propellant to vaporize.

[0062] The cross-section of the second pipeline 6 is C-shaped and is hermetically connected to the outer surface of the second pipe wall 52, reducing the cross-sectional area of the main body structure 2 and enabling the energy dissipator to be suitable for installation in a narrow space.

[0063] The second pipeline 6 includes a fifth pipe wall 61 close to the side wall of the storage tank. There is a gap between the fifth pipe wall 61 and the side wall. Sieve holes are provided on the fifth pipe wall 61. After the gas diffuses through the first pipeline 5, it further diffuses outward through the fifth pipe wall 61, further extending the gas diffusion path. During the diffusion process, using the principle of small hole group sound absorption, the energy is reduced, the noise is reduced, and the flow velocity is made uniform, so that the flow velocity of the diffused high-pressure gas is uniform and the speed is low.

[0064] The first pipeline 5 is formed by bending and welding a flat plate with sieve holes, and standard flat plates with sieve holes can be purchased for processing. The processing is convenient, and the processing cycle and cost of the product are low.

[0065] The second pipe 6 is formed by bending a flat plate with sieve holes. The second pipe 6 is welded to the first pipe 5. A standard flat plate with sieve holes can be purchased for processing into the second pipe 6, which is convenient for processing, and the processing cycle and cost of the product are relatively low. The second pipe 6 is welded to the first pipe 5, and both the sealing performance and connection reliability are good. Moreover, the weld formed by welding is located on the outer surface, which is easy to detect. After being welded into one body, it is convenient to assemble with other components.

[0066] The connecting part 1 includes a flange 11 adapted to be fixedly connected to the side wall and a connecting sleeve 12 passing through a through hole on the flange 11. The connecting sleeve 12 is connected to the main body structure 2. The connecting sleeve 12 has a certain length, which is convenient for connecting the connecting part 1 to the main body structure 2.

[0067] The flange 11 is welded to the connecting sleeve 12. Flanges 11 and sleeves 12 with suitable dimensions can be directly purchased, which shortens the production cycle and reduces the production cost.

[0068] During processing, an installation hole adapted to the outer diameter of the connecting sleeve 12 is processed on the flat plate with sieve holes. The flat plate with sieve holes is bent and welded to form the first pipe 5. First end caps 7 are provided at both ends of the first pipe 5. Another flat plate with sieve holes is formed into a C shape as the second pipe 6, and an installation hole adapted to the outer diameter of the connecting sleeve 12 is processed on this flat plate with sieve holes. After the flange 11 is welded to the connecting sleeve 12, the first pipe 5 is first welded to the connecting sleeve 12, and then the second pipe 6 is welded to the connecting sleeve 12. After that, second end caps 8 are provided. During installation, the flange 11 is fixedly connected to the side wall of the storage tank through bolts. This energy dissipator is located in the annular area between the side wall of the storage tank and the common bottom. During use, after the air pipe is externally connected to high-pressure gas and connected to the connecting part 1, the high-pressure gas sequentially enters the first channel 3 and the second channel 4, diffuses respectively towards both ends and the first pipe wall 51, the third pipe wall 53, and the fourth pipe wall 54 in the first pipe 5, and enters the space between the first pipe 5 and the second pipe 6. Then, part of it will directly diffuse out through the sieve holes on the fifth pipe wall 61 of the second pipe 6, and part will diffuse out through the sieve holes on the second end cap 8. The flow area of the gas is relatively large, the flow path is long, and the diffusion is carried out step by step. Finally, the velocity of the diffused gas is relatively low and the flow velocity is relatively uniform. And because the main body structure 2 extends in the circumferential direction of the storage tank, the outlet direction of the gas is perpendicular to the axial direction of the storage tank, which can ensure the stability of the liquid level in the storage tank, will not cause impact on the liquid level, the pressure above the liquid level is uniform, and the shape of the main body structure 2 is suitable for the installation of the lower tank of the storage tank with a downwardly convex common bottom.

[0069] As the first alternative embodiment of the above embodiment, no sieve holes are provided on the pipe wall of the second pipe 6, and sieve holes are only provided on the second end caps 8 at both ends.

[0070] As a second alternative embodiment of the above embodiment, the shape of the second pipe 6 may be the same as the shape of the first pipe 5. In this embodiment, sieve holes may also be provided on the second pipe wall 52 of the first pipe 5.

[0071] Obviously, the above embodiments are merely examples given for clear illustration and are not limitations on the embodiments. For those of ordinary skill in the art, other different forms of changes or variations can be made based on the above description. It is not necessary and impossible to enumerate all the embodiments here. And the obvious changes or variations derived therefrom are still within the protection scope of the present invention.

Claims

1. An energy dissipator for the lower tank of a downwardly convex co-bottom storage tank, characterized in that, Comprising: A connecting part (1), adapted to be connected to a pressurizing port provided on the side wall of a storage tank, and a first channel (3) adapted for pressurized gas to pass through is provided in the connecting part (1); A main body structure (2), connected to the connecting part (1), a second channel (4) communicating with the first channel (3) is provided in the main body structure (2), the main body structure (2) extends in the circumferential direction of the storage tank, and at least one end of the main body structure (2) is provided with sieve holes, and the outlet direction of the sieve hole gas is perpendicular to the axial direction of the storage tank; The main body structure (2) is in an arc shape, adapted to the shapes of the storage tank and the common bottom, can make full use of the installation space between the storage tank and the common bottom, and is applicable to the installation of the lower tank of a downwardly convex common bottom storage tank.

2. The energy dissipator for the lower tank of the downwardly convex common-bottom storage tank according to claim 1, characterized in that, The cross-sectional area of the second channel (4) is larger than the cross-sectional area of the first channel (3).

3. The energy dissipator according to claim 1, characterized in that, The main body structure (2) includes a first energy dissipation component, and the first energy dissipation component includes a first pipe (5) and first end caps (7) provided at both ends of the first pipe (5), and sieve holes are provided on the first end caps (7).

4. The energy dissipator for the lower tank of the lower convex common bottom storage tank according to claim 3, characterized in that, At least at a position close to the side wall of the storage tank on the first pipe (5), sieve holes are provided.

5. The energy dissipator for the lower tank of the downward convex common bottom storage tank according to claim 3, characterized in that, The main body structure (2) further includes a second energy dissipation component surrounding the first energy dissipation component, and the second energy dissipation component includes a second pipe (6) and second end caps (8) provided at both ends of the second pipe (6), and sieve holes are provided on the second end caps (8).

6. The energy dissipator for the lower tank of the downwardly convex common bottom storage tank according to claim 5, characterized in that, The sieve holes on the second end cap (8) are oblong.

7. A damper for the lower tank of a downwardly convex common bottom storage tank according to claim 5, characterized in that, The first pipe (5) includes a first pipe wall (51) close to the side wall of the storage tank, a second pipe wall (52) opposite to the first pipe wall (51), a third pipe wall (53) connecting the upper ends of the first pipe wall (51) and the second pipe wall (52), and a fourth pipe wall (54) connecting the lower ends of the first pipe wall (51) and the second pipe wall (52), and sieve holes are provided on the first pipe wall (51), the third pipe wall (53), and the fourth pipe wall (54).

8. The energy dissipator for the lower tank of the lower convex common bottom storage tank according to claim 7, characterized in that, The cross-section of the second pipe (6) is in a C shape and is hermetically connected to the outer surface of the second pipe wall (52).

9. A damper for the lower tank of a downwardly convex common-bottom storage tank according to any one of claims 5-8, characterized in that, The second pipe (6) includes a fifth pipe wall (61) close to the side wall of the storage tank, and a gap is provided between the fifth pipe wall (61) and the side wall, and sieve holes are provided on the fifth pipe wall (61).

10. A damper for the lower tank of a downwardly convex common bottom storage tank according to claim 7, characterized in that, The first pipe (5) is formed by bending and welding a flat plate with sieve holes.

11. A damper for the lower tank of a downwardly convex common bottom storage tank according to claim 8, characterized in that, The second pipe (6) is formed by bending a flat plate with sieve holes, and the second pipe (6) is welded to the first pipe (5).

12. The energy absorber for the lower tank of a lower-convex common-bottom storage tank according to claim 1, characterized in that, The connecting part (1) includes a flange plate (11) adapted to be fixedly connected to the side wall and a connecting sleeve (12) passing through a through hole on the flange plate (11), and the connecting sleeve (12) is connected to the main body structure (2).

13. The energy dissipator for the lower tank of the downwardly convex common-bottom storage tank according to claim 12, wherein, The flange plate (11) is welded to the connecting sleeve (12).

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