Shielding door with sandwich structure

Abstract

The utility model provides a shielding door with a sandwich structure, and belongs to the technical field of shielding doors. A shielding door with a sandwich structure is characterized by comprising a door structure, and a lead shielding layer, a tungsten alloy shielding layer and a tungsten resin shielding layer are sequentially arranged in the door structure; the two sides of the door structure are each provided with a neutron absorbing coating in a supersonic spraying mode. The thickness of the shielding door is reduced by more than 20%, the wall thickness and the weight of the shielding door are greatly reduced, and the structure and radiation safety requirements of the shielding door can be met.

Description

Technical Field

[0001] The utility model belongs to the technical field of shielding doors, in particular to a sandwich structure shielding door. Background Art

[0002] Nuclear reactors and radioactive waste disposal areas are extremely radioactive and have a certain neutron emission rate. In order to prevent the harm of radioactive leakage to personnel and the environment, the entrances and exits of these areas need to be protected by shielding doors. At present, the radiation shielding materials used in foreign shielding doors are mainly boron-containing steel, boron-aluminum alloy, B4C / Al composite material, cadmium-gadolinium neutron absorption material, organic polymer, lead, etc. However, the boron content in boron-containing steel is low, the absorption capacity of thermal neutrons and epithermal neutrons is low, and the neutron absorption capacity is poor, which is difficult to meet the storage and transportation of nuclear waste. In addition, the boron content of boron-containing steel and boron-aluminum alloy is low and the strength decreases with the increase of the content; cadmium-gadolinium materials are prone to produce neutron poisons, and organic polymers are difficult to withstand high temperatures and are prone to aging under irradiation conditions. B4C / Al composite materials have low density, high thermal conductivity, good mechanical properties and high neutron absorption capacity, and have been used abroad, but the price of this material is relatively high and cannot be promoted and applied on a large scale. Organic polymers such as boron-containing polyethylene are non-metallic neutron absorption materials. Their matrix is ​​non-metallic, so they do not have good mechanical structural properties. Therefore, they can only be used as a single functional material. In addition, the radiation and corrosion resistance of such materials are not very good. Under high-dose radiation fields, polyethylene is prone to aging and becoming brittle, which limits the use of the material.

[0003] Lead shielding materials have insurmountable disadvantages, such as secondary bremsstrahlung radiation and poor hardness. At the same time, lead itself is a source of heavy metal pollution and is likely to cause heavy metal poisoning during use. Therefore, how to achieve lead-free x-ray radiation shielding while ensuring the radiation shielding effect has become a major problem that has troubled researchers at home and abroad. Relevant departments are vigorously studying alternatives to lead shielding materials and gradually eliminating the use of lead shielding materials. Studies have found that tungsten alloy is the most suitable lead-free x-ray radiation shielding material. Compared with lead, tungsten does not react with particles and is non-toxic, which can better overcome the disadvantages of lead and eliminate the accompanying toxic hazards and mixed waste treatment costs. Tungsten alloys have good radiation protection performance, strong mechanical properties, strong plasticity, high compressive strength, environmental protection and pollution-free properties. Therefore, in the field of lead-free x-ray radiation shielding, tungsten materials have a broader application prospect.

[0004] Tungsten alloy has good radiation protection performance, strong mechanical properties, strong plasticity, high compressive strength, environmental protection and pollution-free. Tungsten materials have broad application prospects. In special occasions such as strictly limited space, or places where mechanical properties and mechanical strength are important, the excellent characteristics of tungsten can be fully reflected without affecting the environment and human body. Tungsten resin sheet is made of tungsten resin based on its low hardness and high density, and then processed by precision. The tungsten content in tungsten resin sheet accounts for 60%-70% by weight, and it has a large density, but it is not a metal material. Tungsten resin sheet is produced by pressing and sintering process, and the binder is a polymer compound, so the shape is completely different from traditional tungsten products.

[0005] At present, the commonly used radiation shielding door structures at home and abroad are mainly: the frame is Q235B steel, and the interior is boron-containing polyethylene or lead-boron polyethylene. Since these materials have weak neutron absorption capacity, in order to meet the national requirements for radiation shielding capacity, the wall thickness of the container is often thicker, such as the resin layer thickness is at least 200cm or more, and the lead shielding layer thickness is at least 20cm. This makes the container huge in size and weight, and the motor control structure is also relatively complex, increasing the probability of failure of the shielding door in the nuclear power plant. Summary of the invention

[0006] The utility model aims to solve the above problems in the prior art and proposes a sandwich structure shielding door, which has the characteristics of reducing the thickness of the shielding door by more than 20%, greatly reducing the wall thickness and weight of the shielding door, and meeting the structural and radiation safety requirements of the shielding door.

[0007] The purpose of the utility model can be achieved through the following technical solutions:

[0008] A sandwich structure shielding door, characterized in that it comprises a door structure, wherein a lead shielding layer, a tungsten alloy shielding layer and a tungsten resin shielding layer are sequentially arranged in the door structure; and a layer of neutron absorption coating is supersonic sprayed on both sides of the door structure.

[0009] In the above-mentioned novel sandwich structure shielding door for nuclear reactor, the door structure is a rectangular structure, and has a chamber arranged along the width direction inside, and the lead shielding layer, tungsten alloy shielding layer and tungsten resin shielding layer are arranged in the chamber.

[0010] In the above-mentioned novel sandwich structure shielding door for nuclear reactor, the door structure adopts Q235B steel structure.

[0011] In the above-mentioned novel sandwich structure shielding door for nuclear reactors, the neutron absorption coating is made of an iron-based amorphous alloy or a B4C / Al composite coating.

[0012] In the above-mentioned novel sandwich structure shielding door for nuclear reactors, the neutron absorption coating has a thickness of 0.3-1 mm, a porosity of less than 1%, and a bonding strength of higher than 50 MPa.

[0013] In the above-mentioned novel sandwich structure shielding door for nuclear reactor, the thickness of the tungsten alloy shielding layer is not less than 5 cm.

[0014] In the above-mentioned novel sandwich structure shielding door for nuclear reactor, the thickness of the tungsten resin shielding layer is not less than 100 cm.

[0015] Compared with the prior art, this application has the following advantages:

[0016] The utility model proposes a new sandwich structure shielding door of B4C / Al composite material or iron-based amorphous alloy coating + Q235B matrix + shielding layer. The thickness of the shielding door coating structure is no more than 1 mm, and the high neutron absorption capacity of the neutron absorption coating is fully utilized. Compared with the traditional shielding door, the thickness is reduced by more than 20%, which greatly reduces the wall thickness and weight of the shielding door. It can not only meet the structural and radiation safety requirements of the shielding door, but also compared with similar products at home and abroad, the shielding door of the utility model is more compact and has a lower cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural diagram of a sandwich structure shielding door in this application.

[0018] In the figure,

[0019] 2. Door structure;

[0020] 3. Lead shielding layer;

[0021] 4. Tungsten alloy shielding layer;

[0022] 5. Tungsten resin shielding layer;

[0023] 6. Neutron absorbing coating. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] like Figure 1As shown, a sandwich structure shielding door is characterized in that it includes a door structure 2, in which a lead shielding layer 3, a tungsten alloy shielding layer 4, and a tungsten resin shielding layer 5 are arranged in the door structure 2, and the lead shielding layer 3, the tungsten alloy shielding layer 4, and the tungsten resin shielding layer 5 are arranged from the inside to the outside of the door structure 2, and a layer of neutron absorption coating 6 is supersonic sprayed on both sides of the door structure 2.

[0026] In this application, it is proposed to spray neutron absorbing coating 6 on both sides of the door structure 2, which can effectively reduce the K eff The coefficient absorbs part of the thermal neutrons and improves the corrosion resistance of the shielding door at the same time. By utilizing the high neutron absorption capacity of the neutron absorption coating 6, the frame thickness is reduced by more than 20%, thereby greatly reducing the thickness and weight of the shielding door while meeting the radiation shielding requirements. It has the characteristics of highly efficient shielding of α, γ, X-rays and neutrons, providing a more economical solution for radiation shielding treatment, and can achieve the purpose of radioactive shielding while meeting the structural strength requirements of the shielding door.

[0027] The lead shielding layer 3 is used for shielding transverse gamma radiation, the tungsten alloy shielding layer 4 is used for shielding transverse gamma radiation and X-rays, and the tungsten resin shielding layer 5 is used for shielding transverse X-rays and neutrons.

[0028] Furthermore, the door structure 2 is a rectangular structure, and has a chamber arranged along the width direction inside, and the lead shielding layer 3, the tungsten alloy shielding layer 4, and the tungsten resin shielding layer 5 are arranged in the chamber.

[0029] Furthermore, the door structure 2 adopts Q235B steel structure. The door structure 2 adopts Q235B steel structure, which plays the role of sealing the internal radiation shielding material and supporting, and the structural thickness is not less than 3.0 cm.

[0030] Furthermore, the neutron absorption coating 6 has a thickness of 0.3-1 mm, a porosity of less than 1%, and a bonding force of more than 50 MPa.

[0031] Furthermore, the neutron absorption coating 6 is made of an iron-based amorphous alloy or a B4C / Al composite coating.

[0032] Furthermore, the thickness of the tungsten alloy shielding layer 4 is not less than 5 cm. The thickness of the tungsten alloy shielding layer 4 can be 5 cm, 6 cm, or 10 cm.

[0033] Furthermore, the thickness of the tungsten resin shielding layer 5 is not less than 100 cm. The resin is polybutylene terephthalate. The thickness of the tungsten resin shielding layer 5 can be 100 cm, 130 cm, 150 cm, or 180 cm.

[0034] It should be noted that all directional indications in the embodiments of the present invention, such as up, down, left, right, front, back, etc., are only used to explain the relative position relationship and movement status of the components in a certain specific posture, as shown in the accompanying drawings. If the specific posture changes, the directional indication will also change accordingly.

[0035] In addition, the descriptions of "first", "second", etc. in the present invention are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. At the same time, the meaning of "and / or" appearing in the full text is that it includes three schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0036] The above components are all common standard parts or components known to those skilled in the art, and their structures and principles can be known to those skilled in the art through technical manuals or conventional experimental methods.

[0037] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A sandwich structure shielding door, characterized in that: The invention comprises a door structure, wherein a lead shielding layer, a tungsten alloy shielding layer and a tungsten resin shielding layer are sequentially arranged in the door structure; and a neutron absorbing coating is supersonic sprayed on both sides of the door structure.

2. The sandwich structure shielding door according to claim 1, characterized in that: The door structure is a rectangular structure, and has a chamber arranged along the width direction inside, and the lead shielding layer, the tungsten alloy shielding layer, and the tungsten resin shielding layer are arranged in the chamber.

3. The sandwich structure shielding door according to claim 1, characterized in that: The door structure adopts Q235B steel structure.

4. The sandwich structure shielding door according to claim 1, characterized in that: The neutron absorption coating is made of an iron-based amorphous alloy or a B4C / Al composite coating.

5. The sandwich structure shielding door according to claim 1, characterized in that: The neutron absorption coating has a thickness of 0.3-1 mm, a porosity of less than 1%, and a bonding force higher than 50 MPa.

6. The sandwich structure shielding door according to claim 1, characterized in that: The thickness of the tungsten alloy shielding layer is not less than 5 cm.

7. The sandwich structure shielding door according to claim 1, characterized in that: The thickness of the tungsten resin shielding layer is not less than 100 cm.

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