Multi-functional protection device for nuclear power plant pipelines

Abstract

The present invention discloses a multifunctional protection device for nuclear power plant pipelines, comprising an inner pressure-bearing layer sleeved around the outer periphery of the pipeline for positioning and fixing the pipeline. The multifunctional protection device for nuclear power plant pipelines is centered on the inner pressure-bearing layer and is sequentially connected from the inside out with a buffer layer, an absorption layer, and an outer pressure-bearing layer. The buffer layer comprises a plurality of hollow tube bundle layers, which are connected around the inner pressure-bearing layer to form a buffer layer. The absorption layer comprises a plurality of interlaced multi-void portions, each of which is provided with a plurality of absorption layer holes. The outer pressure-bearing layer is provided as the outermost layer of the multifunctional protection device for nuclear power plant pipelines to provide rigid support and prevent pipeline leakage. The device can solve the problems of earthquake resistance, fracture and shock absorption, thermal insulation, and quantitative monitoring of medium leakage for important pipelines in nuclear power plants. It can replace dampers, anti-swing limiters, anti-spray baffles, pit liquid level monitoring devices, etc., ensure nuclear safety, optimize design solutions, and save the economic cost of dealing with such problems in nuclear power projects.

Description

Technical Field

[0001] The present invention relates to the field of nuclear power plant pipelines, and in particular to a multifunctional protection device for nuclear power plant pipelines. Background Art

[0002] Pipelines are the channels that carry and transmit media across various nuclear power plant systems. They perform core functions and form critical pressure boundaries. Pipelines are insulated for thermal insulation, equipped with dampers to withstand dynamic loads, and equipped with anti-swing restraints and anti-blowout baffles for rupture protection. Implementing leak-before-break technology requires the use of hardware such as pits to ensure quantifiable leak monitoring. These hardware features are expensive and difficult to maintain, occupying valuable space. Due to external design constraints, these features can be difficult to deploy in some cases, presenting engineering challenges for nuclear power plant construction and operation.

[0003] Current pipe insulation consists of a solid structure wrapped around the outer wall of the pipe. This insulation layer itself has low structural strength and rigidity, and serves a limited purpose. Glass wool is a common insulation material, but it is known to pollute the pipe and has a short lifespan.

[0004] During their service life, pipelines may be subject to common internal and external vibration loads, such as earthquakes, flow-induced vibrations, and valve discharge loads. To meet seismic requirements, dampers and other measures are typically installed. A double-ended shear fracture (or rupture) is a hypothetical accident in nuclear power plants. A pipeline rupture can result in dynamic loads and effects, including medium ejection, pipe whiplash, internal pressure fluctuations, and pressurization of the compartment in which the pipeline is located. To protect against these loads, anti-swing limiters, anti-spray baffles, and explosion-proof brackets are required.

[0005] The application of pipeline rupture prevention technology is often hampered by insufficient leak detection sensitivity and monitoring methods. For example, for pipelines outside the containment vessel, the lack of a pit to collect leaking media makes conventional pit level monitoring and condensate flow monitoring impossible, making it difficult to meet the technical requirements for leak detection reliability, diversity, and redundancy.

[0006] In summary, nuclear power plants utilize separate hardware facilities for protecting pipelines from dynamic loads, thermal insulation, and rupture protection. These facilities serve a single function, are difficult to install and maintain, are costly, and occupy a significant amount of valuable space. When applying rupture prevention technology to pipelines outside the containment vessel, compared to the reactor building, leak detection cannot meet the diversity, reliability, and redundancy requirements due to the lack of underground pits. Summary of the Invention

[0007] The technical problem to be solved by the present invention is to provide a multifunctional protection device for nuclear power plant pipelines.

[0008] The technical solution adopted by the present invention to solve the technical problem is to construct a multifunctional protection device for nuclear power plant pipelines, which includes an inner pressure-bearing layer sleeved on the outer periphery of the pipeline for positioning and fixing the pipeline, and a buffer layer, an absorption layer and an outer pressure-bearing layer connected in sequence from the inside to the outside with the inner pressure-bearing layer as the center;

[0009] The buffer layer includes a plurality of hollow tube bundle layers, and the plurality of hollow tube bundle layers are connected around the inner pressure-bearing layer to form the buffer layer;

[0010] The absorption layer includes a plurality of multi-void portions arranged alternately with each other, and each of the multi-void portions is provided with a plurality of absorption layer pores;

[0011] The outer pressure-bearing layer is arranged on the outermost layer of the multifunctional protection device for nuclear power plant pipelines to provide rigid support.

[0012] In some embodiments, the inner pressure-bearing layer is a tube-sleeve structure made of carbon fiber toughness material.

[0013] In some embodiments, the buffer layer includes a first hollow tube bundle layer connected to the inner pressure-bearing layer, a second hollow tube bundle layer, and a third hollow tube bundle layer connected to the absorption layer, which are sequentially connected from the inside to the outside;

[0014] The first hollow tube bundle layer includes a plurality of first hollow tube bundle units, the second hollow tube bundle layer includes a plurality of second hollow tube bundle units, and the third hollow tube bundle layer includes a plurality of third hollow tube bundle units.

[0015] In some embodiments, the first hollow tube bundle unit and the second hollow tube bundle unit are staggered, and the second hollow tube bundle unit and the third hollow tube bundle unit are staggered.

[0016] In some embodiments, the area of the first hollow tube bundle unit is larger than the area of the second hollow tube bundle unit, and the area of the second hollow tube bundle unit is larger than the area of the third hollow tube bundle unit;

[0017] The density of the first hollow tube bundle unit is lower than the density of the second hollow tube bundle unit, and the density of the second hollow tube bundle unit is lower than the density of the third hollow tube bundle unit.

[0018] In some embodiments, the first hollow tube bundle layer is formed by sequentially arranging a plurality of the first hollow tube bundle units, the second hollow tube bundle layer is formed by sequentially arranging a plurality of the second hollow tube bundle units, and the third hollow tube bundle layer is formed by sequentially arranging a plurality of the third hollow tube bundle units; or

[0019] The first hollow tube bundle layer is formed by winding several first hollow tube bundle units around the pipe axis, the second hollow tube bundle layer is formed by winding several second hollow tube bundle units around the pipe axis, and the third hollow tube bundle layer is formed by winding several third hollow tube bundle units around the pipe axis.

[0020] In some embodiments, tube bundles are nested in the first hollow tube bundle unit, the second hollow tube bundle unit, and the third hollow tube bundle unit.

[0021] In some embodiments, the buffer layer is a layer structure made of plastic, metal or composite material.

[0022] In some embodiments, the absorption layer is a layer structure made of rubber or a composite material.

[0023] In some embodiments, an interlaced surface is formed between every two of the multi-void portions; or

[0024] A predetermined gap is provided between every two of the multi-void portions.

[0025] In some embodiments, the interlaced surface is in the shape of a plane or a pear-shaped surface.

[0026] In some embodiments, the porosity of the pores of the absorbent layer close to the interlaced plane is lower than the porosity of the pores of the absorbent layer far from the interlaced plane.

[0027] In some embodiments, the outer pressure-bearing layer is a pipe sleeve structure made of metal material.

[0028] In some embodiments, the multifunctional protection device for nuclear power plant pipelines further includes a partition connected to the outer pressure-bearing layer.

[0029] In some embodiments, the multifunctional protection device for nuclear power plant pipelines further comprises a plurality of segment support frames connected to the partitions and support anchors connected to the plurality of segment support frames;

[0030] A plurality of segment support frames are arranged at intervals along the axial direction of the outer pressure-bearing layer.

[0031] The implementation of the present invention has the following beneficial effects: the multifunctional protection device for nuclear power plant pipelines includes an inner pressure-bearing layer sleeved on the outer periphery of the pipeline for positioning and fixing the pipeline. The multifunctional protection device for nuclear power plant pipelines is centered on the inner pressure-bearing layer, and is sequentially connected from the inside to the outside with a buffer layer, an absorption layer, and an outer pressure-bearing layer. The buffer layer includes a plurality of hollow tube bundle layers, and the plurality of hollow tube bundle layers are connected around the inner pressure-bearing layer to form a buffer layer. The absorption layer includes a plurality of multi-void portions arranged in an interlaced manner, each of which is provided with a plurality of absorption layer holes. The outer pressure-bearing layer is provided on the outermost layer of the multifunctional protection device for nuclear power plant pipelines to provide rigid support. It can solve the problems of earthquake resistance, fracture and shock, thermal insulation, and quantitative monitoring of medium leakage of important pipelines in nuclear power plants. It can replace dampers, anti-swing limiters and anti-spray baffles, pit liquid level monitoring devices, etc., optimize the technical solution, can be promoted and applied in batches, ensure nuclear safety, optimize the design solution, and save the economic cost of nuclear power projects in dealing with such problems. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solution of the present invention, the present invention will be further described below with reference to the accompanying drawings and embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and should not be considered as limiting the scope. A person of ordinary skill in the art can derive other relevant drawings based on these drawings without inventive effort. In the drawings:

[0033] Figure 1 is a cross-sectional view of the insulation layer structure of a multifunctional protection device for nuclear power plant pipelines in some embodiments of the present invention;

[0034] Figure 2 is a cross-sectional view of a segment support portion of a multifunctional protection device for nuclear power plant pipelines in some embodiments of the present invention;

[0035] Figure 3 1 is an overall appearance diagram of a multifunctional protection device for nuclear power plant pipelines in some embodiments of the present invention. DETAILED DESCRIPTION

[0036] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific embodiments of the present invention are now described in detail with reference to the accompanying drawings. In the following description, it should be understood that the directions or positional relationships indicated by "front", "back", "up", "down", "left", "right", "longitudinal", "horizontal", "vertical", "horizontal", "top", "bottom", "inside", "outside", "head", "tail", etc. are based on the directions or positional relationships shown in the accompanying drawings and are constructed and operated in specific directions. They are only for the convenience of describing the technical solution and do not indicate that the devices or components referred to must have specific directions. Therefore, they should not be understood as limiting the present invention.

[0037] It should also be noted that, unless otherwise clearly specified and limited, terms such as "installed", "connected", "connected", "fixed", and "set" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. When an element is referred to as being "on" or "under" another element, the element can be "directly" or "indirectly" located on the other element, or there may be one or more intervening elements. The terms "first", "second", "third", etc. are only for the convenience of describing the present technical solution, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second", "third", etc. may explicitly or implicitly include one or more of such features. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0038] See also Figures 1 to 3 , a multifunctional nuclear power plant pipeline protection device in some embodiments of the present invention, comprises an inner pressure-bearing layer 2 sleeved around the outer periphery of a pipeline 1 for positioning and securing the pipeline 1. The multifunctional nuclear power plant pipeline protection device is centered around the inner pressure-bearing layer 2 and is sequentially connected from the inside out to a buffer layer 3, an absorbent layer 4, and an outer pressure-bearing layer 5. The buffer layer 3 comprises several hollow tube bundles, which are connected around the inner pressure-bearing layer 2 to form the buffer layer 3. The absorbent layer 4 comprises several interlaced multi-void portions 41, each of which is provided with a number of absorbent layer pores 411. The outer pressure-bearing layer 5 is provided as the outermost layer of the multifunctional nuclear power plant pipeline protection device to provide rigid support. The inner pressure-bearing layer 2, buffer layer 3, absorbent layer 4, and outer pressure-bearing layer 5 together form the thermal insulation structure of the multifunctional nuclear power plant pipeline protection device. The multifunctional protection device for nuclear power plant pipelines also includes a partition 6 connected to the outer pressure-bearing layer 5, a plurality of segment support frames 7 connected to the partition 6, and a support anchor 8 connected to the plurality of segment support frames 7. The plurality of segment support frames 7 are arranged at intervals along the axial direction of the outer pressure-bearing layer 5.

[0039] It can be understood that the multifunctional protection device for nuclear power plant pipelines can solve the problems of earthquake resistance, fracture and swing resistance, thermal insulation and quantitative monitoring of medium leakage of important pipelines 1 of nuclear power plants. It can replace dampers, anti-swing limiters and anti-injection baffles, pit liquid level monitoring devices, etc., optimize the technical solutions, can be promoted and applied in batches, ensure nuclear safety, optimize design solutions, and save the economic cost of nuclear power projects in dealing with such problems.

[0040] It is worth noting that, following nature's design principles, biological entities have evolved over billions of years of evolution to develop efficient and multifunctional structures, achieving anatomical optimization to maximize material and structural utilization and survive in harsh environments. These anatomical structures include, but are not limited to, tubular, gradient, layered, stratified, and helical elements. They are lightweight yet remarkably tough, capable of withstanding the impact of dynamic loads for long periods of time, providing valuable insights into the design of engineering structures with exceptional mechanical properties.

[0041] Woodpeckers exhibit excellent shock absorption properties when rhythmically tapping their beaks. They can peck at a frequency of 18-22 times per second, an average of 12,000 times per day, with each bout taking approximately 50 milliseconds. During pecking, the impact deceleration is approximately 1000g, with repeated impact velocities of approximately 6-7m / s, yet no head injuries have been observed following the impacts. Research has found that the nanostructure of the woodpecker's beak exhibits a densely packed wave-like structure at the grain boundaries and an interlaced suture structure with narrow gaps along the edges. This structure provides shock absorption and converts vibration waves into shear waves. Furthermore, the woodpecker's head contains a rigidly supported long tongue, consisting of a hyoid apparatus and a subdural space. This long tongue has a smooth and large contact surface with the skull, converting normal stress waves into shear waves, generating lateral deformation. In turn, the strain energy is dissipated by the adjacent muscles, which exhibit viscoelastic behavior. The cellular structure of the skull and subdural space also play an important role in shock absorption. In this embodiment, the multifunctional protection device for nuclear power plant pipelines uses high-strength inner and outer pressure-bearing layers 5 to simulate the rigid skull and subdural space of a woodpecker, and uses an absorption layer 4 to imitate the beak and tongue of a woodpecker to spread and absorb impact energy to obtain optimal shock absorption and impact resistance performance.

[0042] Among them, bamboo's multicellular square tubes and nacre-like composite tubular structures, as well as coconut and durian shells and peels, all exhibit excellent impact resistance, exhibiting high strength, impact resistance, and viscoelastic damping behavior. Their commonality lies in their multi-layered, gradually varying internal cavities or tubular structures, with their size and density varying gradually. Furthermore, the presence of bamboo nodes imparts effective load-bearing and impact resistance to the structures. Using specific energy absorption capacity in J / g to measure the impact resistance of different structures, a comparison of impact-resistant structures used in existing engineering projects with candidate biomimetic structures derived from nature reveals that biomimetic structures can often absorb more than six times the energy of conventional engineering structures. In this embodiment, the buffer layer 3 utilizes a gradually varying internal cavity to simulate the biological structure of the interlayer between bamboo stems and durian peels, while partitions 6 and segment supports 7 simulate the nodes on bamboo stems. This achieves optimal shock absorption and impact resistance. The multi-layered, gradually varying internal cavity also provides thermal insulation and can accommodate and transmit leaks from the pipeline 1, facilitating quantitative leak monitoring using leak-before-break technology.

[0043] Specifically, the inner pressure-bearing layer 2 is a pipe-sleeve structure made of a carbon fiber toughness material. As can be understood, this carbon fiber toughness material has advantages such as light weight, high strength, corrosion resistance, and high temperature resistance. It can be a carbon fiber reinforced polyphenylene sulfide composite material, a carbon fiber reinforced thermoplastic polyimide composite material, a carbon fiber reinforced thermoplastic polyimide composite material, or other carbon fiber toughness materials. The inner pressure-bearing layer 2 provides the first barrier of thermal insulation for the multifunctional protection device for nuclear power plant pipelines, forming a cohesive whole, enhancing the mechanical properties of the insulation layer structure, and restraining and alleviating vibration and impact experienced by the pipeline 1 structure.

[0044] In this embodiment, the number of hollow tube bundle layers is three. The buffer layer 3 may include, sequentially from the inside out, a first hollow tube bundle layer 31 connected to the inner pressure-bearing layer 2, a second hollow tube bundle layer 32, and a third hollow tube bundle layer 33 connected to the absorbent layer 4. The first hollow tube bundle layer 31 includes a plurality of first hollow tube bundle units 311, the second hollow tube bundle layer 32 includes a plurality of second hollow tube bundle units 321, and the third hollow tube bundle layer 33 includes a plurality of third hollow tube bundle units 331. Furthermore, the first hollow tube bundle units 311 and the second hollow tube bundle units 321 are staggered, and the second hollow tube bundle units 321 and the third hollow tube bundle units 331 are staggered. It is understood that the different hollow tube bundle layers of the buffer layer 3 should be staggered to enhance structural rigidity and sealing. In other embodiments, the number of hollow tube bundle layers may be more than three, and this number can be adjusted according to actual conditions and is not specifically limited here.

[0045] Preferably, the area of the first hollow tube bundle unit 311 is larger than that of the second hollow tube bundle unit 321, which in turn is larger than that of the third hollow tube bundle unit 331. The density of the first hollow tube bundle unit 311 is lower than that of the second hollow tube bundle unit 321, which in turn is lower than that of the third hollow tube bundle unit 331. It is understood that the buffer layer 3 can be composed of multiple layers of hollow tube bundles with a gradient in size, with the tube bundles near the pipeline 1 being larger and having a lower density, while the tube bundles near the absorption layer 4 are smaller and have a higher density. This ensures that the buffer layer 3 has sufficient deformation capacity under dynamic external loads to significantly absorb energy and dampen the vibration rate of the structure. It also provides a channel for the storage and transmission of pipeline media leakage, facilitating quantitative leakage monitoring. The multi-layered, gradient hollow structure of the buffer layer 3 also provides excellent thermal insulation.

[0046] Furthermore, the first hollow tube bundle layer 31 is formed by a plurality of first hollow tube bundle units 311 arranged in sequence, the second hollow tube bundle layer 32 is formed by a plurality of second hollow tube bundle units 321 arranged in sequence, and the third hollow tube bundle layer 33 is formed by a plurality of third hollow tube bundle units 331 arranged in sequence. Alternatively, the first hollow tube bundle layer 31 is formed by a plurality of first hollow tube bundle units 311 wound around the axis of the pipe 1, the second hollow tube bundle layer 32 is formed by a plurality of second hollow tube bundle units 321 wound around the axis of the pipe 1, and the third hollow tube bundle layer 33 is formed by a plurality of third hollow tube bundle units 331 wound around the axis of the pipe 1. It is understood that the hollow tube bundle layer of the buffer layer 3 can be designed to have hollow tube bundle units helically wound around the axis of the pipe 1. This structure provides stronger viscous damping against radial vibration loads due to interlayer friction or interaction forces and better cross-sectional bending stiffness.

[0047] The first hollow tube bundle unit 311, the second hollow tube bundle unit 321, and the third hollow tube bundle unit 331 are all nested with tube bundles. As can be understood, the tube bundles are smaller than the hollow tube bundle units. This design significantly enhances the stiffness of the buffer layer 3 and increases structural damping through interlayer friction.

[0048] Preferably, the buffer layer 3 is a layer structure made of plastic, metal or composite material. It is understandable that the buffer layer 3 can be made of a material with good plastic ductility and high fracture toughness value, such as graphite, silicone or other materials.

[0049] Preferably, the absorption layer 4 is a layered structure made of rubber or a composite material. As will be appreciated, rubber is elastic and wear-resistant, and the material of the absorption layer 4 exhibits a viscoelastic structure, providing high viscous damping and a large deformation capacity. Furthermore, the absorption layer 4 comprises a multi-layered, interlaced, multi-void structure, with interlaced planes 42 formed between each two multi-void sections 41. The porosity of the absorption layer pores 411 near the interlaced planes 42 is lower than the porosity of the absorption layer pores 411 farther from the interlaced planes 42. As will be appreciated, the porosity of the absorption layer 4 is lower near the interlaced planes 42 and higher farther from the interlaced planes 42. This provides relatively high local structural stiffness at the interlaced planes 42, converting the transverse vibration waves of the pipeline 1 into shear waves along the circumferential direction of the pipeline 1. At the same time, the higher porosity increases viscous damping and vibration energy absorption, thus providing better thermal insulation. The interlaced surface 42 is shaped as a plane or a pear-shaped surface, which can better convert the transverse vibration shock wave into annular shear waves and achieve better mutual restraint. In some embodiments, a predetermined gap can also be provided between each two multi-void portions 41 to further enhance the shock absorption capability.

[0050] Furthermore, the outer pressure-bearing layer 5 is a pipe sleeve structure made of metal material. The metal material can preferably be stainless steel, which has high strength, good toughness and weldability, good tensile strength, and corrosion resistance. In some other embodiments, the outer pressure-bearing layer 5 can also be made of 45 steel, 20 steel or other materials, which are not specifically limited here. Among them, the outer pressure-bearing layer 5 provides rigid support for the entire insulation layer structure, and combines with the partition 6 and segment support to provide axial and radial constraint stiffness along the pipeline 1. It can be understood that the outer pressure-bearing layer 5 can form a barrier for the pipeline 1 with the inner pressure-bearing layer 2, and can serve as the pressure-bearing boundary of the pipeline 1. The outer pressure-bearing layer 5 can work together with the inner pressure-bearing layer 2 to prevent the pipeline 1 from leaking, so as to ensure the safety and reliability of the pipeline 1 when transporting the medium. At the same time, the outer pressure-bearing layer 5 can also work together with the inner pressure-bearing layer 2 to provide overall rigid support for the pipeline 1 and position and fix the pipeline 1.

[0051] The partition 6 is a rigid annular structure that is welded to the segments of the outer pressure-bearing layer 5, dividing the insulation layer of the pipeline 1 into different segments for easy disassembly, inspection, and maintenance. The segment support frame 7 and support anchor 8 apply segment constraints to the insulation layer through the partition 6, providing the necessary rigidity for the entire structure. The segment support frame 7 and support anchor 8 can be designed in combination with the design of the pipeline 1 itself and the layout of the pipeline 1 support. They can be optionally combined with the pipeline 1 support to form a combined structure. The segment division and constraint setting can be reasonably demonstrated and optimized based on the necessary piping system mechanical analysis results. Preferably, the partition 6, segment support frame 7, and support anchor 8 can all be made of carbon steel, which can be Q235 high-quality carbon steel, to ensure the overall rigidity of the nuclear power plant pipeline multifunctional protection device. Furthermore, the surfaces of the partition 6, segment support frame 7, and support anchor 8 can also be provided with a galvanized layer to improve corrosion resistance.

[0052] In some other embodiments, according to actual engineering requirements, in order to solve the problem of quantitative monitoring of pipeline leakage, a hollow tube cavity can be added to the insulation layer. To achieve the function of pipeline cushioning, the structure of the tube cavity can be used to replace the damper in a very short section of the pipeline to achieve pipeline cushioning.

[0053] In some other embodiments, according to actual engineering requirements, anti-swing limiters, dampers, pit liquid level collection devices and conventional glass wool solid insulation layers can be set on or near the pipeline, and sufficient layout space can be added to further enhance the buffering and insulation performance of the multifunctional protection device for the nuclear power plant pipeline.

[0054] It can be understood that the beneficial effects of the multifunctional protection device for nuclear power plant pipelines are:

[0055] 1. The structure is compact, simple and symmetrical, easy to install and maintain, and convenient for mass promotion;

[0056] 2. This multifunctional nuclear power plant pipeline protection device can replace dampers, anti-swing limiters and anti-blast baffles, pit liquid level monitoring devices, etc., and can achieve the functions of thermal insulation, earthquake resistance, and anti-swing and anti-blast functions of nuclear power plant pipelines 1. It also provides a new channel for quantitative leakage monitoring of pipeline media. Especially when the pipeline leak before failure technology is applied to the pipeline outside the containment, this multifunctional nuclear power plant pipeline protection device can provide a more reliable and convenient monitoring method than pit liquid level monitoring and refrigerant flow monitoring. It provides an optional solution to related engineering problems, ensures nuclear safety, optimizes design solutions, and saves the economic cost of dealing with such problems in nuclear power projects.

[0057] 3. The design of buffer layer 3, inspired by and recreating the structures of optimized organisms in nature, such as durian peel and bamboo, provides a highly effective shock-absorbing and energy-absorbing structure for vibration and impact loads on pipeline 1. It also provides a sound hardware structure for thermal insulation and leak detection of pipeline 1.

[0058] 4. The design of the absorption layer 4 converts the cross-sectional vibration waves generated by the vibration and impact of the pipeline 1 into shear waves along the circumferential direction of the pipeline 1. The porous structure provides excellent viscous damping and deformation capacity, and can also produce good thermal insulation effect;

[0059] 5. The semi-rigid design of the inner and outer pressure-bearing layers 2 and 5, together with the buffer layer 3 and the absorbent layer 4, mimics the combined structure of the woodpecker's beak, skull, tongue and subdural space, providing an optimized seismic and impact-resistant structure selected by nature.

[0060] It can be understood that the above embodiments only express the preferred implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the patent scope of the present invention. It should be pointed out that for ordinary technicians in this field, without departing from the concept of the present invention, the above technical features can be freely combined, and several deformations and improvements can be made, all of which fall within the scope of protection of the present invention. Therefore, all equivalent changes and modifications made to the scope of the claims of the present invention should fall within the scope of coverage of the claims of the present invention.

Claims

1. A multifunctional protection device for nuclear power plant pipelines, characterized in that: It comprises an inner pressure-bearing layer (2) sleeved on the outer periphery of a pipeline (1) for positioning and fixing the pipeline (1), and a buffer layer (3), an absorption layer (4) and an outer pressure-bearing layer (5) are sequentially connected from the inside to the outside with the inner pressure-bearing layer (2) as the center; The buffer layer (3) comprises a plurality of hollow tube bundle layers, and the plurality of hollow tube bundle layers are connected around the inner pressure-bearing layer (2) to form the buffer layer (3); The absorption layer (4) comprises a plurality of multi-void portions (41) arranged in an interlaced manner, and each of the multi-void portions (41) is provided with a plurality of absorption layer pores (411); The outer pressure-bearing layer (5) is provided on the outermost layer of the multifunctional protection device for nuclear power plant pipelines and is used to provide rigid support and prevent leakage of the pipeline (1); The buffer layer (3) comprises a first hollow tube bundle layer (31) connected to the inner pressure-bearing layer (2), a second hollow tube bundle layer (32), and a third hollow tube bundle layer (33) connected to the absorption layer (4), which are sequentially connected from the inside to the outside; The first hollow tube bundle layer (31) includes a plurality of first hollow tube bundle units (311), the second hollow tube bundle layer (32) includes a plurality of second hollow tube bundle units (321), and the third hollow tube bundle layer (33) includes a plurality of third hollow tube bundle units (331); The first hollow tube bundle unit (311) and the second hollow tube bundle unit (321) are staggered, and the second hollow tube bundle unit (321) and the third hollow tube bundle unit (331) are staggered; The area of the first hollow tube bundle unit (311) is larger than the area of the second hollow tube bundle unit (321), and the area of the second hollow tube bundle unit (321) is larger than the area of the third hollow tube bundle unit (331); The density of the first hollow tube bundle unit (311) is smaller than the density of the second hollow tube bundle unit (321), and the density of the second hollow tube bundle unit (321) is smaller than the density of the third hollow tube bundle unit (331).

2. The multifunctional protection device for nuclear power plant pipelines according to claim 1, characterized in that: The inner pressure-bearing layer (2) is a pipe-sleeve structure made of carbon fiber toughness material.

3. The multifunctional protection device for nuclear power plant pipelines according to claim 1, characterized in that: The first hollow tube bundle layer (31) is formed by sequentially arranging a plurality of the first hollow tube bundle units (311), the second hollow tube bundle layer (32) is formed by sequentially arranging a plurality of the second hollow tube bundle units (321), and the third hollow tube bundle layer (33) is formed by sequentially arranging a plurality of the third hollow tube bundle units (331); or The first hollow tube bundle layer (31) is formed by winding a plurality of the first hollow tube bundle units (311) around the axis of the pipe (1), the second hollow tube bundle layer (32) is formed by winding a plurality of the second hollow tube bundle units (321) around the axis of the pipe (1), and the third hollow tube bundle layer (33) is formed by winding a plurality of the third hollow tube bundle units (331) around the axis of the pipe (1).

4. The multifunctional protection device for nuclear power plant pipelines according to claim 3, characterized in that: Tube bundle components are nested in the first hollow tube bundle unit (311), the second hollow tube bundle unit (321), and the third hollow tube bundle unit (331).

5. The multifunctional protection device for nuclear power plant pipelines according to claim 1, characterized in that: The buffer layer (3) is a layer structure made of plastic, metal or composite material.

6. The multifunctional protection device for nuclear power plant pipelines according to claim 1, characterized in that: The absorption layer (4) is a layer structure made of rubber or composite material.

7. The multifunctional protection device for nuclear power plant pipelines according to claim 1, characterized in that: An interlaced surface (42) is formed between each two of the multi-void portions (41); or A predetermined gap is provided between each two of the multi-gap portions (41).

8. The multifunctional protection device for nuclear power plant pipelines according to claim 7, characterized in that: The shape of the interlaced surface (42) is a plane or a pear-shaped surface.

9. The multifunctional protection device for nuclear power plant pipelines according to claim 7, characterized in that: The porosity of the absorbing layer pores (411) close to the intersecting surface (42) is lower than the porosity of the absorbing layer pores (411) away from the intersecting surface (42).

10. The multifunctional protection device for nuclear power plant pipelines according to claim 1, characterized in that: The outer pressure-bearing layer (5) is a pipe sleeve structure made of metal material.

11. The multifunctional protection device for nuclear power plant pipelines according to claim 10, characterized in that: The multifunctional protection device for nuclear power plant pipelines further comprises a partition (6) connected to the outer pressure-bearing layer (5).

12. The multifunctional protection device for nuclear power plant pipelines according to claim 11, characterized in that: The multifunctional protection device for nuclear power plant pipelines further comprises a plurality of segment support frames (7) connected to the partition (6) and support anchors (8) connected to the plurality of segment support frames (7); A plurality of segment support frames (7) are arranged at intervals along the axial direction of the outer pressure-bearing layer (5).

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