Electron accelerator

Abstract

The utility model relates to an electron accelerator, two ends of a cylindrical body are respectively connected with a top cover and a base assembly, an accelerating tube is connected with the base assembly in the cylindrical body, electrons injected by a laser electron gun assembly form a high-energy electron beam in the accelerating tube, and the accelerating tube is fixed in a closed space formed by the cylindrical body. The insulating structural member comprises an insulating cover and an insulating cylinder, the insulating cover is in close fit with the top cover in the top cover, the insulating cylinder and the insulating cover are also fixed in the closed space, the insulating cover and the insulating cylinder form an insulating cavity, the accelerating tube is arranged in the insulating cavity, and the remaining space between the accelerating tube and the cylinder body is filled with the insulating glue layer. According to the electron accelerator provided by the utility model, solid insulation is provided through the combination of the insulating structural member and the insulating adhesive layer, compared with a high-pressure gas insulated accelerator in the prior art, the volume is greatly reduced, the breakdown voltage of the accelerator can be greatly improved, the operation is more stable, and the service life is greatly prolonged; and the manufacturing cost is also greatly reduced.

Description

Technical Field

[0001] The utility model relates to an accelerator, and more specifically to an electron accelerator. Background Art

[0002] Over the past 20 years, the application of accelerators has far exceeded the fields of nuclear physics and particle physics, and has important applications in other scientific and technological fields such as materials science, surface physics, molecular biology, photochemistry, etc. In the fields of industry, agriculture, and medicine, accelerators are widely used in isotope production, tumor diagnosis and treatment, radiation disinfection, non-destructive testing, polymer radiation polymerization, material radiation modification, ion implantation, ion beam microanalysis, space radiation simulation, nuclear explosion simulation, etc. The electron irradiation accelerator device is one of the basic equipment in the radiation processing industry. In the field of radiation processing industry, the electron irradiation accelerator, as an important production equipment, has made great progress in terms of quantity, specifications, quality, matching, and application.

[0003] There are many types of electron accelerators, among which a high-frequency high-voltage accelerator (also called "ground nanometer accelerator") is the most widely used and relatively stable electron accelerator in the world. The electron beam it provides is a radiation source for industrial production. The high-frequency high-voltage accelerator is composed of a voltage doubling system, a high-frequency high-voltage power supply, an accelerating tube, an electron gun, an extraction scanning system, a vacuum system, a gas (nitrogen, carbon dioxide, sulfur hexafluoride gas) processing system and other equipment. The high-frequency high-voltage power supply is composed of a high-frequency oscillating tube, a high-frequency transformer, a high-frequency electrode, and a distributed capacitor formed between a steel cylinder and a voltage doubling core column. It injects a high-frequency voltage of about 200kV between the two high-frequency electrodes. This high-frequency voltage is connected to a parallel coupling voltage doubling system through the distributed capacitor between the high-frequency electrode and the upper semicircular ring of the core column and the rectifier silicon stack in the core column. After several levels of voltage doubling rectification, an extremely high DC voltage is generated at the high-voltage cap at the top. The electron flow generated by the electron gun at the same potential as the high-voltage cap is accelerated by the accelerating tube under the action of this high potential voltage. The high-energy electron beam coming out of the accelerating tube is scanned horizontally by a magnetic scanner, and then passes through the titanium window for radiation processing of the product. The high-pressure steel cylinder is filled with insulating gas (nitrogen, carbon dioxide, sulfur hexafluoride) to ensure the high potential gradient of the accelerator. The defects of this electron accelerator are: it is huge, mainly reflected in the overall height and large diameter of the cylinder (the diameter can reach three meters). Therefore, a large factory building is required to install the electron accelerator. The structure of the factory building has high requirements, and there are many inconveniences in moving, transporting and installing. Secondly, the overall structure is complex, the number of parts is large, and the overall manufacturing cost is very high, which also increases the difficulty of large-scale promotion of the equipment. Thirdly, in order to ensure the stability of the high voltage of several million volts of the accelerator body, the accelerator body must be placed in a large steel cylinder filled with high-voltage insulating gas. In addition, a pressure gas storage tank is required to replace the high-voltage insulating gas inside the steel cylinder. The steel cylinder is a steel pressure vessel. A set of cooling devices (such as cold traps) must be configured on the top of the steel cylinder to continuously cool the high-frequency transformer. The high-voltage insulating gas is easily mixed with impurities, thereby affecting the insulation of the cylinder. There are many types of high-voltage insulating gases, including nitrogen, carbon dioxide, and sulfur hexafluoride. Sulfur hexafluoride is a toxic gas. Once the pipeline leaks, it is easy to cause safety hazards. The greenhouse effect potential (GWP) of sulfur hexafluoride is 23,500 times that of carbon dioxide, and its lifespan in the atmosphere is about 3,200 years. This means that the impact of 1 kg of sulfur hexafluoride leaking into the atmosphere on global warming is equivalent to about 23.5 tons of carbon dioxide, and it can be considered that it will remain in the atmosphere forever and cannot be degraded, causing great harm to the environment. The above-mentioned shortcomings of the high-frequency and high-voltage accelerators in the prior art have had an adverse impact on the promotion and application of accelerators.

[0004] Therefore, there is a great need for an electron accelerator that can overcome the defects of the existing technology, has a small size, occupies a small area, has low requirements for factory space, has a simple structure, has low manufacturing cost, is safer, and is easy to move, transport and install. Utility Model Content

[0005] In order to solve the problems of large size, high cost and gas hidden dangers of the electron accelerator in the above-mentioned prior art, the utility model provides an electron accelerator.

[0006] According to the utility model, the electron accelerator comprises a base bearing, a cylinder, an accelerating tube, an insulating structural member and an insulating adhesive layer, wherein the cylinder comprises a top cover and a cylindrical body, one end of the cylindrical body is connected to the top cover, and the other end of the cylindrical body is connected to the base bearing, the accelerating tube is connected to the base bearing inside the cylinder, the electrons injected by the laser electron gun assembly (cathode) form a high-energy electron beam in the accelerating tube, the accelerating tube is fixed in a closed space formed by the cylinder, the insulating structural member comprises an insulating cover and an insulating cylinder, the insulating cover is tightly matched with the top cover in the top cover, the insulating cylinder and the insulating cover are also fixed in the closed space, the insulating cover and the insulating cylinder form an insulating chamber, the accelerating tube is arranged in the insulating chamber, and the insulating adhesive layer fills the remaining space between the accelerating tube and the cylinder.

[0007] Preferably, the insulating glue layer is provided by insulating glue filled in the space between the accelerating tube and the insulating cylinder.

[0008] Preferably, the electron accelerator further comprises a voltage multiplier assembly connected to the base assembly in the cylinder, which is located on the outside of the accelerating tube and is wrapped by an insulating rubber layer.

[0009] Preferably, the electron accelerator further comprises a high-voltage cap which is arranged on the inner side of the insulating cover and fixedly connected to the top end of the accelerating tube.

[0010] Preferably, the insulating structural member is formed by bonding diamond powder with an adhesive, or by sintering ceramic, polytetrafluoroethylene, glass, or quartz material, or by pouring or injection molding PVC plastic, or by winding various insulating films.

[0011] Preferably, the insulating adhesive layer is formed by potting of organic silicon, or epoxy resin, or polyurethane, or polyacrylate.

[0012] Preferably, the electron accelerator further comprises a laser electron gun assembly disposed in the cylinder, which is located at the top of the accelerating tube and is used to inject electrons into the accelerating tube.

[0013] According to the electronic accelerator of the utility model, solid insulation is provided by combining the insulating structural member and the insulating rubber layer, which greatly reduces the volume of the accelerator with high-voltage gas insulation in the prior art, and can also greatly improve the breakdown voltage of the accelerator. At the same time, the damage to the atmospheric environment caused by gas leakage is avoided. The solid-insulated accelerator runs more stably, the service life is greatly extended, and the manufacturing cost is greatly reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a cross-sectional view of the overall structure of an electron accelerator according to a preferred embodiment of the utility model. DETAILED DESCRIPTION

[0015] The preferred embodiments of the present utility model are given below in conjunction with the accompanying drawings and described in detail.

[0016] like Figure 1 As shown, the electron accelerator according to a preferred embodiment of the utility model comprises a base assembly 1 and a cylinder 2. The cylinder 2 is connected to the top of the base assembly 1, and the injected electrons form a high-energy electron beam in the cylinder 2.

[0017] like Figure 1 As shown, the electron accelerator according to this embodiment further includes an accelerating tube 3 connected to the top of the base assembly 1 in the cylinder 2, which is the core component of the electron accelerator for accelerating electrons in a high vacuum environment, and the accelerating tube 3 is fixed in a closed space A formed by the inner surface of the cylinder 2. Specifically, the cylinder 2 includes a top cover 21 and a cylindrical body 22, wherein the top cover 21 is hemispherical, the upper end of the cylindrical body 22 is connected to the lower end of the top cover 21, the lower end of the cylindrical body 22 is connected to the upper surface of the base assembly 1, and the accelerating tube 3 is located below the top cover 21 and radially inward of the cylindrical body 22.

[0018] like Figure 1 As shown, the electron accelerator according to this embodiment further includes a voltage multiplier assembly 4 connected to the upper part of the base assembly 1 in the cylinder 2, which is located outside the accelerating tube 3 to increase the electric field strength between the electrode sheets of the accelerating tube 3 to improve the acceleration effect of the electrons. The injected high-frequency high-voltage power is subjected to multi-stage voltage multiplication rectification through the voltage multiplier assembly 4 in the cylinder 2 to reach a predetermined high-voltage potential, and the electrons form a high-energy electron beam in the accelerating tube 3 under the action of the high-voltage potential.

[0019] like Figure 1 As shown, the electron accelerator according to this embodiment further includes an insulating structural member 5 disposed in the barrel 2, which includes an insulating cover 51 and an insulating cylinder 52 formed in one piece. The insulating cover 51 is hemispherical so that the insulating cover 51 and the top cover 21 are closely matched, for example, in shape matching, that is, the outer surface of the insulating cover 51 matches the inner surface of the top cover 21 of the barrel 2. The insulating cylinder 52 and the insulating cover 51 are also fixed in the closed space A. The inner surfaces of the insulating cover 51 and the insulating cylinder 52 form an insulating chamber B. The accelerating tube 3 and the voltage multiplier assembly 4 are disposed in the insulating chamber B. In this way, the accelerating tube 3 and the voltage multiplier assembly 4 are insulated by the insulating structural member 5. In this embodiment, the insulating structural member is formed by bonding diamond micropowder with an adhesive, or formed by sintering ceramics, polytetrafluoroethylene, glass, quartz and other materials, or cast or injection molded by plastics such as PVC, or wound by various insulating films.

[0020] like Figure 1 As shown, the electron accelerator according to this embodiment also includes an insulating rubber layer 7 disposed in the cylinder 2, which fills the remaining space of the enclosed space A between the accelerating tube 3 and the cylinder 2. Specifically, the insulating rubber layer 7 is provided by the insulating rubber filling the space between the accelerating tube 3 and the insulating cylinder 52 of the insulating structural member 5. In this embodiment, the insulating rubber layer 7 is formed by encapsulating an insulating rubber layer made of silicone, or epoxy resin, or polyurethane, or polyacrylate, etc. It should be understood that during the formation of the insulating rubber layer 7, the enclosed space A can be evacuated so that the mixture is more tightly filled in its remaining space, for example, the mixture enters the pores of the voltage multiplier assembly 4 so that the voltage multiplier assembly 4 is wrapped by the insulating rubber layer. Obviously, the insulating structural member 5 composed of the insulating cover 51 and the insulating cylinder 52 forms a first layer of insulation, and the insulating rubber layer 7 forms a second layer of insulation, and the double-layer insulation ensures the insulation effect.

[0021] like Figure 1 As shown, the electron accelerator according to this embodiment further includes a laser electron gun assembly 8 disposed in the cylinder 2 , which is located at the top of the accelerating tube 3 for injecting electrons into the accelerating tube 3 .

[0022] Thus, according to the electron accelerator of the utility model, solid insulation is provided by the combination of the insulating structural member 5 and the insulating rubber layer 7, which greatly reduces the volume compared to the high-voltage gas-insulated accelerator of the prior art, is more stable in operation, has a greatly extended service life, and greatly reduces the manufacturing cost. Moreover, the double insulation of the insulating structural member 5 and the insulating rubber layer 7 can improve the insulation effect and greatly reduce the volume of the cylinder 2 compared to the high-frequency and high-voltage accelerator of the prior art that fills the steel cylinder with high-voltage insulating gas, and does not require a pressure gas storage tank to replace the high-voltage insulating gas inside the steel cylinder. In addition, according to the electron accelerator of the utility model, a cooling device is not required to continuously cool the high-frequency transformer (the high-frequency transformer is not in the cylinder), and since the insulating gas containing toxic sulfur hexafluoride gas is not used, the safety of the atmosphere is protected and it is also safer for the human body.

[0023] From the overall perspective of the electron accelerator of the utility model, the electron accelerator of the utility model has a simpler structure and fewer parts, which can realize low-cost equipment, reduce the user's equipment investment and daily operation and maintenance costs, improve the safety of equipment use and the stability of operation, and the miniaturization of the electron accelerator reduces the hardware requirements of the factory, breaks the space limitations of the equipment, and can reduce the user's hardware investment in the factory. At the same time, it is convenient to move and transport, which greatly expands the application scenarios. In summary, the use of the electron accelerator of the utility model overcomes the shortcomings of the existing technology and has great promotion and application value.

[0024] The above is only a preferred embodiment of the utility model, and is not intended to limit the scope of the utility model. The above embodiments of the utility model can also be modified in various ways. That is, all simple, equivalent changes and modifications made according to the claims and the contents of the specification of the utility model application fall within the scope of protection of the claims of the utility model patent. The conventional technical contents are not described in detail in the utility model.

Claims

1. An electron accelerator, characterized in that: The electron accelerator comprises a base bearing, a cylinder, an accelerating tube, an insulating structural member and an insulating adhesive layer, wherein the cylinder comprises a top cover and a cylindrical body, one end of the cylindrical body is connected to the top cover, and the other end of the cylindrical body is connected to the base bearing, the accelerating tube is connected to the base bearing inside the cylinder, the electrons injected by the laser electron gun assembly form a high-energy electron beam in the accelerating tube, the accelerating tube is fixed in a closed space formed by the cylinder, the insulating structural member comprises an insulating cover and an insulating cylinder, the insulating cover is tightly matched with the top cover in the top cover, the insulating cylinder and the insulating cover are also fixed in the closed space, the insulating cover and the insulating cylinder form an insulating chamber, the accelerating tube is arranged in the insulating chamber, and the insulating adhesive layer fills the remaining space between the accelerating tube and the cylinder.

2. The electron accelerator according to claim 1, characterized in that: The insulating glue layer is provided by the insulating glue filled in the space between the accelerating tube and the insulating cylinder.

3. The electron accelerator according to claim 2, characterized in that: The electron accelerator also includes a voltage multiplier component connected to the base assembly in the cylinder, which is located outside the accelerating tube and is wrapped by an insulating rubber layer.

4. The electron accelerator according to claim 1, characterized in that: The electron accelerator also includes a high-voltage cap which is arranged on the inner side of the insulating cover and fixedly connected to the top end of the accelerating tube.

5. The electron accelerator according to claim 1, characterized in that: The insulating adhesive layer is formed by potting of organic silicon, epoxy resin, polyurethane, or polyacrylate.

6. The electron accelerator according to claim 1, characterized in that: The electron accelerator also includes a laser electron gun assembly placed in the cylinder, which is located at the top of the accelerating tube and is used to inject electrons into the accelerating tube.

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