Large pool pressure reduction sealing shell considering pre-deformation and pressure reduction system

Abstract

The invention provides a large pool pressure reduction sealing shell considering pre-deformation and a pressure reduction system, and belongs to the field of ship and ocean engineering experimental equipment. The problems of large deformation and poor stability under the negative pressure condition due to the fact that the size of a sealing shell of a large-scale pool is large are solved. A large pool pressure reduction sealing shell considering pre-deformation comprises a pressure reduction sealing shell body, the pressure reduction sealing shell body comprises a plurality of segments arranged in the radial direction, each segment comprises a plurality of arc-shaped concave surface structures arranged in the circumferential direction, and the arc-shaped concave surface structures are sunken from the outer side of the pressure reduction sealing shell body to the inner side of the pressure reduction sealing shell body. The device is mainly used for model tests.

Description

Technical Field

[0001] The invention belongs to the field of ship and ocean engineering experimental equipment, and in particular relates to a large-scale water tank decompression sealing shell and a decompression system taking pre-deformation into consideration. Background Art

[0002] The research and development of various types of marine equipment requires extensive model testing. Considering the cavitation phenomenon that occurs during the movement of high-speed marine engineering equipment, model tests for these projects must be conducted under reduced pressure conditions to ensure similar cavitation numbers. According to similarity theory, test accuracy decreases with decreasing scale. Therefore, to ensure accurate testing of large-scale marine engineering model tests, such as out-of-water vehicle model tests, propeller open-water tests, and hydrofoil performance tests, a large-volume, decompressible, sealed water tank is required to meet the requirements of larger-scale models. Compared to small-scale decompression chambers or water tanks, the sealed shell of a large-scale tank is larger, requiring higher strength and pressure-bearing capacity. Furthermore, ensuring the airtightness of a large sealed water tank is more challenging. The large air space in the upper portion of a large sealed water tank also increases the time required for decompression and air return, and the high noise generated by the air return is also an unavoidable issue.

[0003] In order to establish a large-scale sealed water tank decompression test environment, it is necessary to establish a large-scale water tank decompression sealing shell and decompression system that takes pre-deformation into account. Publication number CN117589389A discloses a rapid decompression test device that can quickly provide a stable negative pressure environment for the test. However, this patent is only applicable to small vacuum chambers and cannot be applied to decompression tests in large water tanks. Publication number CN216969969U discloses an indirect air return system for decompression water tanks in extremely cold regions, which can heat the cold air during the air return process to avoid the adverse effects of temperature changes on the equipment. However, this patent does not consider the problem of air return noise in large water tanks and only involves the water tank air return system, without considering the construction of the external pressure-bearing shell of the large water tank. Therefore, in order to meet the actual needs of marine equipment development and promote the development of large-scale decompression sealed water tank system equipment under laboratory conditions, it is necessary to develop a large-scale water tank sealed shell and decompression system that can effectively bear pressure, effectively seal, and eliminate the high noise generated by the return air. Summary of the Invention

[0004] In view of this, the present invention aims to propose a large-scale water pool decompression sealing shell and decompression system that takes pre-deformation into consideration, so as to solve the problem that the large size of the sealing shell of the large-scale water pool leads to large deformation and poor stability under negative pressure conditions.

[0005] To achieve the above objectives, the present invention adopts the following technical solutions: According to one aspect of the present invention, a large-scale water pool decompression sealing shell taking pre-deformation into consideration is provided, comprising:

[0006] The decompression sealing shell includes a plurality of segments arranged radially, wherein the segments include a plurality of circumferentially arranged arc-shaped concave structures, and the concave direction of the arc-shaped concave structures is from the outside to the inside of the decompression sealing shell.

[0007] Furthermore, the segment is in the shape of a semicircular arch as a whole, and each of the arc-shaped concave structures is a part of the semicircular arch.

[0008] Furthermore, adjacent segments are sealed and connected, and adjacent arc-shaped concave structures are sealed and connected.

[0009] Furthermore, a concrete pool is provided on the lower side of the sealed shell, and the decompression sealed shell and the concrete pool are cast integrally.

[0010] Furthermore, an organic coating is used to seal the concrete water pool and the pressure-reducing sealing shell.

[0011] According to another aspect of the present invention, a decompression system is provided, comprising the large-scale pool decompression sealing housing considering pre-deformation as described above, and further comprising:

[0012] a decompression assembly connected to the decompression sealed housing and used for reducing and controlling the vacuum degree in the decompression sealed housing;

[0013] The air return assembly is used for returning air to the decompression sealing shell.

[0014] Furthermore, the decompression assembly also includes a vacuum pump group, an exhaust pipeline and an exhaust control valve. The vacuum pump group is connected to the decompression sealing shell through the exhaust pipeline, and an exhaust control valve is provided at the connection between the exhaust pipeline and the decompression sealing shell.

[0015] Furthermore, the return air component includes a pipeline silencer and a return air control valve, the pressure reducing sealing shell is connected to the return air pipeline, the return air control valve is provided on the return air pipeline, and a pipeline silencer for eliminating noise is provided at the inlet end.

[0016] Furthermore, the return air control valve is a pneumatic vacuum butterfly valve.

[0017] Furthermore, the pipe silencer is a louver-type grille plate.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. This sealed shell adopts a large water pool decompression sealed shell that takes pre-deformation into consideration. Through the numerous arc-shaped concave structures distributed on the surface, it can effectively cope with the pressure of the internal and external pressure difference on the shell after vacuuming, and has high structural stability and pressure-bearing capacity;

[0020] 2. This sealed shell adopts the embedded integral casting method to handle the connection between the steel structure and the concrete structure of the large-scale water pool decompression sealed shell, and uses organic coating to seal the joints, which has high sealing performance;

[0021] 3. This decompression system adopts modular design of decompression system and return air system, actively controls the flow rate of exhaust and return air and uses silencers at the end to eliminate the high noise generated by exhaust and return air. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings, which constitute part of the present invention, are provided to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are provided to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0023] Figure 1 This is a schematic diagram of the three-dimensional structure of a large-scale water pool pressure-reducing sealing shell taking pre-deformation into consideration according to the present invention;

[0024] Figure 2 This is a diagram of the segmented structure of the present invention;

[0025] Figure 3 Schematic diagram of the structure of the pressure reduction system of the present invention.

[0026] Decompression sealing shell 1; decompression assembly 2; return air assembly 3; segment 4; arc-shaped concave structure 5; vacuum pump group 6; exhaust pipeline 7; exhaust control valve 8; pipeline muffler 9; return air control valve 10. DETAILED DESCRIPTION

[0027] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely explain the technical solutions in the embodiments of the present invention. It should be noted that the embodiments of the present invention and the features therein can be combined with each other in the absence of conflict, and the embodiments described are only part of the embodiments of the present invention, not all of the embodiments.

[0028] It should be noted that the descriptions of the present invention regarding directions such as "left", "right", "left side", "right side", "upper", "lower", "top", and "bottom" are all defined based on the relationship between the orientations or positions shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the structure described must be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on the present invention. In the description of the present invention, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0029] In the description of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediary, or internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in the present invention based on the specific circumstances.

[0030] Referring to the accompanying drawings, this embodiment is described. According to one aspect of the present invention, there is provided a large-scale pool pressure-reducing sealing shell taking pre-deformation into consideration, comprising:

[0031] The pressure reducing sealing shell 1 includes a plurality of segments 4 arranged radially, wherein the segments 4 include a plurality of circumferentially arranged arc-shaped concave structures 5, and the concave direction of the arc-shaped concave structure 5 is from the outside to the inside of the pressure reducing sealing shell 1. The arrangement of the plurality of segments 4 can be extended over a large area, thereby laying the foundation for building a large water pool. The segments 4 are sealed and connected with each other, and the connection method can be connected by a high-strength bolt group, and the sealing method is reasonably selected according to the actual situation. The arc-shaped concave structure 5 adopts a pre-deformation method, which can have higher structural stability and pressure-bearing capacity when the internal and external pressure difference is large. Prevent large deformation. At the same time, due to the modular design, the difficulty of transportation can be reduced. In the event that a single arc-shaped concave structure 5 is damaged, it only needs to be disassembled and assembled separately to complete the maintenance work.

[0032] In this embodiment, the segment 4 is generally semicircular in shape, and each of the arcuate concave structures 5 is a portion of the semicircular arch. Adjacent segments 4 are sealed together, and adjacent arcuate concave structures 5 are sealed together. A semicircular arch can provide good structural strength, but when the structure is large, the arched walls may buckle locally, creating local inward depressions, which can affect the stability of the shell structure and even lead to buckling and failure under large pressure differentials. The arcuate concave structures 5 mimic the buckling deformation of conventional large shells after evacuation before stress is applied, providing a pre-deformed state for the large decompression sealed shell. In this state, if the shell surface is subjected to pressure, the resulting deformation is far less than that in a conventional state without pre-deformation. This improves the pressure-bearing capacity of the large decompression sealed shell and prevents local deformation and failure.

[0033] In this embodiment, a concrete pool is provided below the sealed housing, and the pressure-reducing sealed housing 1 is integrally cast with the concrete pool. The upper half of the large pressure-reducing sealed housing body is constructed of steel, while the lower half is constructed of concrete. These two structures are embedded and cast as a single unit, minimizing gaps in the housing. Organic coatings are used for sealing at the joints, polyurethane is used for sealing at the air contact surface, and polyurea is used for sealing at the water contact surface. This improves sealing and reduces water and air leakage.

[0034] In this embodiment, an organic coating is used to seal the concrete pool and the pressure-reducing sealing shell 1, thereby increasing the sealing and stability during use and preventing air leakage that would cause difficulty in maintaining pressure.

[0035] According to another aspect of the present invention, a decompression system is provided, comprising the large-scale pool decompression sealing housing considering pre-deformation as described above, and further comprising:

[0036] A decompression assembly 2, connected to the decompression sealed housing 1, for reducing and controlling the vacuum degree in the decompression sealed housing 1;

[0037] The air return assembly 3 is used for returning air to the decompression sealing housing 1 .

[0038] like Figure 3 In this embodiment, the decompression assembly 2 further includes a vacuum pump group 6, an exhaust pipe 7 and an exhaust control valve 8. The vacuum pump group 6 is connected to the decompression sealed shell 1 via the exhaust pipe 7. The exhaust control valve 8 is provided at the connection between the exhaust pipe 7 and the decompression sealed shell 1. The vacuum pump group 6 includes a plurality of vacuum pumps arranged side by side and connected in parallel. The vacuum pump group is arranged as a whole below the exhaust pipe 7. The exhaust control valve 8 can control the decompression and control of the vacuum degree of the decompression chamber.

[0039] In this embodiment, the return air assembly 3 includes a duct muffler 9 and a return air control valve 10. The pressure-reducing sealed housing 1 is connected to the return air line, which is equipped with the return air control valve 10 and a duct muffler 9 at the inlet for noise reduction. Analysis shows that noise is transmitted outward from the exterior wall where the air intake is located, and the duct muffler 9 can eliminate this noise.

[0040] In this embodiment, the return air control valve 10 is a pneumatic vacuum butterfly valve that controls the return air flow rate, thereby reducing noise and providing better air heating. The duct silencer 9 is a louvered grille. Through valve control and the air retardation effect of the louvered grille, noise during vacuum return air is reduced and air flow rate is controlled. By controlling the opening of the louvered grille and the return air control valve 10, noise can be reduced while flow rate can be optimally controlled for better air heating.

[0041] The embodiments of the present invention disclosed above are intended only to illustrate the present invention. The embodiments do not describe all details in detail, nor do they limit the present invention to the specific embodiments described. Numerous modifications and variations are possible based on the contents of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention.

Claims

1. A large pool decompression sealing shell considering pre-deformation, characterized in that: include: A decompression sealing shell (1) comprises a plurality of segments (4) arranged in a radial direction, wherein the segments (4) comprise a plurality of circumferentially arranged arc-shaped concave structures (5), and the concave direction of the arc-shaped concave structures (5) is from the outside to the inside of the decompression sealing shell (1).

2. A large-scale pool decompression sealing shell taking pre-deformation into consideration according to claim 1, characterized in that: The segment (4) is in the shape of a semicircular arch as a whole, and each of the arc-shaped concave structures (5) is a part of the semicircular arch.

3. A large-scale pool decompression sealing shell taking pre-deformation into consideration according to claim 2, characterized in that: Adjacent segments (4) are sealed and connected, and adjacent arc-shaped concave structures (5) are sealed and connected.

4. The large-scale pool decompression sealing shell considering pre-deformation according to claim 1, characterized in that: A concrete pool is provided on the lower side of the sealed shell, and the decompression sealed shell (1) and the concrete pool are cast in one piece.

5. The large-scale pool decompression sealing shell considering pre-deformation according to claim 4, characterized in that: An organic coating is used to seal the concrete water pool and the pressure-reducing sealing shell (1).

6. A decompression system comprising a large pool decompression sealing shell according to any one of claims 1 to 5, wherein: Also includes: A decompression assembly (2), connected to the decompression sealed housing (1), and used for reducing and controlling the vacuum degree in the decompression sealed housing (1); An air return assembly (3) is used for returning air to the decompression sealing housing (1).

7. The decompression system according to claim 6, characterized in that: The decompression assembly (2) further comprises a vacuum pump group (6), an air extraction pipeline (7) and an air extraction control valve (8); the vacuum pump group (6) is connected to the decompression sealing housing (1) via the air extraction pipeline (7); and an air extraction control valve (8) is provided at the connection between the air extraction pipeline (7) and the decompression sealing housing (1).

8. The decompression system according to claim 6, characterized in that: The return air assembly (3) comprises a pipeline silencer (9) and a return air control valve (10); the pressure reducing sealing housing (1) is connected to the return air pipeline; the return air control valve (10) is provided on the return air pipeline; and a pipeline silencer (9) for eliminating noise is provided at the inlet end.

9. The decompression system according to claim 8, characterized in that: The air return control valve (10) is a pneumatic vacuum butterfly valve.

10. The pressure reducing system according to claim 8, wherein: The pipeline silencer (9) is a shutter-type grille plate.

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