Heat insulation device for electron gun of industrial electron accelerator

Abstract

The utility model relates to the field of industrial electron accelerators, in particular to a heat insulation device for an electron gun of an industrial electron accelerator. The cable comprises a base body and a shielding layer assembly. The shielding layer assembly comprises a first shielding layer, a second shielding layer and a third shielding layer which are sequentially distributed on the base body from inside to outside, the inner side of the first shielding layer is provided with a filament containing space, the top of the first shielding layer is provided with a first opening, the top of the second shielding layer is provided with a second opening, and the top of the third shielding layer is provided with a third opening. And the first opening, the second opening and the third opening are distributed in an aligned manner. According to the utility model, rapid diffusion and attenuation of temperature can be prevented, high-temperature stability around the lanthanum hexaboride filament at the inner side can be maintained, and energy efficiency of the whole accelerator can be ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of industrial electron accelerator, in particular to a kind of industrial electron accelerator electron gun heat insulation device. BACKGROUND

[0002] It has become important process means in chemical industry, electric power, agricultural and sideline products, environmental protection and other industries to carry out irradiation processing by electron beam generated by industrial electron accelerator.Cathode electron gun in electron accelerator is its core component, electron gun releases electron from cathode material by heating, focuses electron by electric field and gives preliminary kinetic energy, so that electron forms beam, and prepares for subsequent acceleration stage.

[0003] The design of electron gun directly affects the intensity, stability and shape of electron beam, which is crucial to the overall performance and efficiency of accelerator.For electron gun with lanthanum hexaboride as cathode material, electron begins to escape when its temperature reaches 1050 DEG C, so it is necessary to ensure the stability of temperature in the cathode position range of electron gun. SUMMARY

[0004] The utility model aims at the problems in the background art, proposes a kind of industrial electron accelerator electron gun heat insulation device, can prevent temperature rapid diffusion attenuation, maintains the high temperature stability around lanthanum hexaboride filament in inside, to ensure that accelerator whole machine energy efficiency.

[0005] The technical scheme of the utility model, a kind of industrial electron accelerator electron gun heat insulation device, including base body and shielding layer component;Shielding layer component includes the first shielding layer, second shielding layer and third shielding layer that are sequentially distributed from inside to outside on base body, first shielding layer inside has filament containing space, first shielding layer top has first aperture, second shielding layer top has second aperture, third shielding layer top has third aperture, first aperture, second aperture and third aperture are aligned distribution.

[0006] Preferably, the first shielding layer, the second shielding layer and the third shielding layer are all cylindrical structures and coaxially distributed, and the diameters and heights are sequentially increased.

[0007] Preferably, the first aperture, the second aperture and the third aperture are all circular holes and are respectively centrally distributed on the top of the first shielding layer, the second shielding layer and the third shielding layer.

[0008] Preferably, the diameters of the first aperture, the second aperture and the third aperture are the same, and all less than the diameter of the first shielding layer.

[0009] Preferably, a cylindrical peripheral shielding layer is coaxially distributed on the periphery of the third shielding layer on the base body, and the top end height of the peripheral shielding layer is higher than the top end height of the third shielding layer.

[0010] Preferably, the first shielding layer, the second shielding layer and the third shielding layer are all made of tantalum, and the peripheral shielding layer comprises a first stainless steel cylinder, a tantalum cylinder and a second stainless steel cylinder which are coaxially welded from bottom to top.

[0011] Preferably, the first shielding layer, the second shielding layer, the third shielding layer and the bottom end of the first stainless steel cylinder are all welded on the base body.

[0012] Compared with the prior art, the industrial electronic accelerator electron gun heat insulation device has the following beneficial technical effects:

[0013] The heat insulation device can prevent rapid diffusion and attenuation of temperature, maintain high-temperature stability around the inner lanthanum hexaboride filament, and further ensure the energy efficiency of the whole accelerator. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 The structure schematic view of shielding the filament on the inner side for the embodiment of the utility model;

[0015] Figure 2 The structure sectional view of the peripheral shielding layer.

[0016] Reference signs: 1, base body; 2, lanthanum hexaboride filament; 3, first shielding layer; 4, second shielding layer; 5, third shielding layer; 6, peripheral shielding layer; 61, first stainless steel cylinder; 62, tantalum cylinder; 63, second stainless steel cylinder. DETAILED DESCRIPTION

[0017] Embodiment one

[0018] As shown in the drawings, the industrial electronic accelerator electron gun heat insulation device provided by the embodiment comprises a base body 1 and a shielding layer assembly. Figure 1

[0019] The shielding layer assembly comprises a first shielding layer 3, a second shielding layer 4 and a third shielding layer 5 which are sequentially distributed from inside to outside on the base body 1, the first shielding layer 3 has a filament accommodating space on the inner side, and the lanthanum hexaboride filament 2 is arranged on the base body 1 and located inside the filament accommodating space.

[0020] The first shielding layer 3, the second shielding layer 4 and the third shielding layer 5 are all in the structure of a barrel and coaxially distributed, and the diameter and the height are both sequentially increased, so that three layers of shielding and heat insulation can be realized.

[0021] ​The top of the first shielding layer 3 has a first opening, the top of the second shielding layer 4 has a second opening, and the top of the third shielding layer 5 has a third opening; the first opening, the second opening and the third opening are all circular holes and are centrally distributed on the top of the first shielding layer 3, the second shielding layer 4 and the third shielding layer 5 respectively; the lanthanum hexaboride filament 2 is aligned with the three openings, and the diameters of the three openings are all greater than the corresponding size of the lanthanum hexaboride filament 2, facilitating the escape of the electron beam. The diameters of the first opening, the second opening and the third opening are the same and are all less than the diameter of the first shielding layer 3, which is conducive to heat insulation.

[0022] The first shielding layer 3, the second shielding layer 4 and the third shielding layer 5 are all made of tantalum, and metal tantalum has a high melting point and thermal resistance. The bottom ends of the first shielding layer 3, the second shielding layer 4 and the third shielding layer 5 are all welded on the base body 1, so that firm connection can be achieved.

[0023] The embodiment realizes heat insulation through the multi-layer shielding layer made of tantalum, so that more heat is gathered in the space where the lanthanum hexaboride filament 2 is located, the rapid diffusion and attenuation of temperature can be prevented, the high-temperature stability around the lanthanum hexaboride filament 2 on the inside is maintained, and thus the energy efficiency of the whole industrial electron accelerator can be ensured.

[0024] Embodiment two

[0025] As shown in Figure 1 and Figure 2 , the industrial electron accelerator electron gun heat insulation device provided in the embodiment has the following advantages. Compared with the first embodiment, in the embodiment, the base body 1 is provided with a cylindrical peripheral shielding layer 6 coaxially distributed on the periphery of the third shielding layer 5, and the top end of the peripheral shielding layer 6 is higher than the top end of the third shielding layer 5, so that further heat insulation and protection can be realized through the peripheral shielding layer 6. The peripheral shielding layer 6 includes a first stainless steel cylinder 61, a tantalum cylinder 62 and a second stainless steel cylinder 63 which are coaxially welded from bottom to top, so that the structural strength of the shielding layer is improved. The bottom end of the first stainless steel cylinder 61 is welded on the base body 1, so that firm welding can be achieved.

[0026] The embodiments of the utility model are described in detail above in combination with the drawings, but the utility model is not limited to this, and various changes can be made within the knowledge range possessed by the person skilled in the art without departing from the purpose of the utility model.

Claims

1. An industrial electron accelerator electron gun heat shield apparatus, comprising: The utility model relates to a lamp base, which comprises: a base (1); a shielding layer assembly comprising a first shielding layer (3), a second shielding layer (4) and a third shielding layer (5) arranged in sequence from inside to outside on the base (1), the first shielding layer (3) having a filament accommodating space on the inside, the first shielding layer (3) having a first opening on the top, the second shielding layer (4) having a second opening on the top, the third shielding layer (5) having a third opening on the top, and the first opening, the second opening and the third opening being arranged in alignment.

2. The industrial electron accelerator electron gun heat shield assembly of claim 1 wherein, The first shielding layer (3), the second shielding layer (4) and the third shielding layer (5) are all in the form of a barrel and coaxially arranged, and the diameter and height of each of them increase in sequence.

3. The industrial electron accelerator electron gun heat shield assembly of claim 2 wherein, The first opening, the second opening and the third opening are all in the form of a circular hole and arranged in the center of the top of the first shielding layer (3), the second shielding layer (4) and the third shielding layer (5) respectively.

4. The industrial electron accelerator electron gun heat shield of claim 3 wherein, The diameter of the first opening, the second opening and the third opening is the same, and all smaller than the diameter of the first shielding layer (3).

5. The industrial electron accelerator electron gun heat shield assembly of claim 2 wherein, The base (1) is provided with a cylindrical peripheral shielding layer (6) coaxially arranged on the periphery of the third shielding layer (5), and the height of the top of the peripheral shielding layer (6) is higher than the height of the top of the third shielding layer (5).

6. The industrial electron accelerator electron gun heat shield assembly of claim 5 wherein, The first shielding layer (3), the second shielding layer (4) and the third shielding layer (5) are all made of tantalum, and the peripheral shielding layer (6) comprises a first stainless steel cylinder (61), a tantalum cylinder (62) and a second stainless steel cylinder (63) coaxially welded in sequence from bottom to top.

7. The industrial electron accelerator electron gun heat shield assembly of claim 6 wherein, The bottom of the first shielding layer (3), the second shielding layer (4), the third shielding layer (5) and the first stainless steel cylinder (61) is welded to the base (1).

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