CN215222571U

CN215222571U - Central area structure for BNCT accelerator

Info

Publication number: CN215222571U
Application number: CN202120515121.5U
Authority: CN
Inventors: 郑侠; 管锋平; 冀鲁豫; 宋国芳; 张天爵; 安世忠
Original assignee: China Institute of Atomic of Energy
Current assignee: China Institute of Atomic of Energy
Priority date: 2021-03-11
Filing date: 2021-03-11
Publication date: 2021-12-17
Anticipated expiration: 2031-03-11

Abstract

The utility model discloses a central area structure for a BNCT accelerator, which solves the problem that the upper flange plate of a spiral deflection plate cannot dissipate heat due to the lack of an effective heat-conducting object by improving the position of a beam limiting plate component; the volume of the upper deflection plate is doubled, so that the upper deflection plate can be connected with the beam limiting plate assembly, and the heat of the upper deflection plate can be transferred out through the beam limiting plate assembly; the wall thickness of a beam channel between the upper flange and the lower flange is improved, so that the heat conduction effect of the upper deflection plate is enhanced; through set up the evacuation gap on the ring flange down for the effect of ring flange is not only the connection object, still becomes the passageway of evacuation, increases a plane through the periphery of ceramic insulation pad under and is higher than its ceramic insulation cover, makes single ceramic insulation pad become superimposed ceramic insulation pad, and ceramic insulation pad overall shape, position, thickness have been changed, have solved the problem of not striking sparks well because of insulating from this.

Description

Central area structure for BNCT accelerator

Technical Field

The utility model belongs to the technical field of the cyclotron, concretely relates to center structure for BNCT accelerator.

Background

BNCT (boron neutron capture) cancer therapy is a novel cancer therapy mode developed in recent years, is one of the international leading-edge anticancer therapy technologies at present, and has the principle that a medicine containing a nonradioactive boron isotope (boron-10) is used as a tumor positioning medicine and a neutron capture agent, after the medicine is injected into a human body, when the medicine reaches a certain concentration in a tumor, a neutron beam generated by targeting with an accelerator is used for irradiating the tumor of the human body, the neutron beam and the boron isotope (boron-10) generate a nuclear reaction to generate radioactive particles, cancer cells are accurately destroyed in the cancer cells, and normal tissues are not accidentally injured. Is a novel cancer treatment technology which is currently and internationally developed.

The miniaturized BNCT cancer treatment device based on the strong-current cyclotron is the latest generation cancer treatment device innovated and developed by the Chinese atomic energy scientific research institute, is easier to perform large-scale management by adopting the miniaturized BNCT cancer treatment device, simultaneously means lower land occupation and construction cost, and is beneficial to the popularization of BNCT treatment in more middle and small hospitals and the expansion of the usability and the usability of the BNCT treatment device. The miniaturized BNCT cancer treatment device adopts a 14MeV strong-current cyclotron to lead out a strong-current proton beam with the current of more than 1mA, a beryllium target is bombarded to generate a neutron beam, and neutron energy spectrum distribution required by treatment is obtained through a moderator.

The structural design of the central area of the accelerator is one of the difficulties in realizing the miniaturized BNCT cancer treatment device. The central area of the accelerator is used for receiving the beam injected by the ion source and deflecting the beam from the vertical direction to the horizontal direction. The central area structure is difficult to design because the central area space of the accelerator is very small, the whole space is less than 20 cm, and the central area is a vacuum environment which can not radiate heat through convection, even a little heat can not be radiated, and the heat can be accumulated for a long time. In such a narrow vacuum environment, not only heat cannot be dissipated, but also the flow intensity is increased from 300uA to 1mA, which is difficult.

The reason that the current intensity of the existing small cyclotron is limited to 300uA and can not be improved any more is that the heat dissipation structure of the central area is not good enough, firstly, the upper deflection plate of the spiral deflection plate as a heat source lacks objects which can transfer heat more effectively around the upper deflection plate, and the only thing which can dissipate the heat of the upper deflection plate is an insulating support column for supporting the upper deflection plate, and the heat dissipation of the upper deflection plate of the spiral deflection plate is little because the insulating support column has a thinner diameter and has a small contact area with the spiral deflection plate; secondly, the diameter of the superposed upper deflection plate and lower deflection plate of the spiral deflection plate is only 4.3 cm, so the volume of the upper deflection plate is very small, the volume of the upper deflection plate is only half of the volume before improvement, and the same heat is reduced by half due to the volume reduction, so the heat stored in unit volume is reduced by one time; thirdly, the lower deflection plate of the spiral deflection plate does not directly radiate heat but indirectly radiate heat, and the heat radiation effect is not ideal: the lower deflection plate is firstly connected with the copper block and then connected with the lower flange through the copper block, so that the lower deflection plate cannot be directly connected with the lower flange, and the problem of direct connection of the lower flange cannot be solved, so that the lower deflection plate cannot be directly connected with the lower flange; fourthly, because the heat of the spiral pore canal in the central area is inconvenient to dissipate, if the vacuum degree is not good enough, the periphery of the spiral deflection plate is ignited when the temperature rises to a certain degree, and the central area after ignition is short-circuited and can not deflect beam current.

In summary, the problems of the central area heat dissipation structure in the prior art are: the upper deflection plate has small area for heat conduction, the upper deflection plate has small volume for storing heat, the lower deflection plate does not directly radiate heat but indirectly radiate heat, and the spiral deflection plate is not smooth in vacuum pumping to cause ignition.

SUMMERY OF THE UTILITY MODEL

The utility model discloses to the problem that prior art provided, provide a center structure for BNCT accelerator, aim at solves that prior art center structure heat conduction area is little, the thermal volume of storage is small, indirect heat dissipation rather than indirect heat dissipation, the not smooth problem of spiral deflector evacuation.

The utility model discloses a solve its technical problem and propose following technical scheme:

a central area structure for a BNCT accelerator comprises a spiral deflection plate 2 used for deflecting beam current, wherein the spiral deflection plate 2 used for deflecting beam current comprises an upper spiral deflection plate 201 and a lower spiral deflection plate 202, a spiral pore channel is arranged between the upper spiral deflection plate and the lower spiral deflection plate, and the spiral pore channel is used for deflecting the beam current from the vertical direction to the horizontal direction along the spiral pore channel; the beam limiting plate component 3 is used for clamping beam current passing through the beam limiting plate component, and the flange plate component 1 and the heat conducting ceramic component are used for supporting and radiating the spiral deflection plate 2; an upper insulating support assembly 4 for supporting and powering the upper helical deflector plate 201; a lower insulating support member 5 connected to and supplying power to the lower deflection plate 202; this ring flange subassembly 1 includes ring flange 101 and lower ring flange 102, its characterized in that:

the restriction plate assembly 3 comprises a first support block 302 and a second support block 303, the upper spiral deflection plate 201 is fixed on the upper flange plate 101 through the first support block 302 and the second support block 303, heat of the upper spiral deflection plate 201 is transmitted to the upper flange plate 101 through the first support block 302 and then transmitted to the lower flange plate 102 through the upper flange plate 101, and therefore heat on the upper spiral deflection plate 201 is taken away;

the volume of the upper spiral deflection plate 201 close to one side of the first support block 302 is doubled, and the upper spiral deflection plate is used for being connected with the first support block 302, so that the heat of the upper spiral deflection plate 201 is transferred to the upper flange plate 101 through the first support block 302;

the middle layer of the flange plate component 1 is a beam leading-out area with a beam leading-out opening of a spiral deflector 2, the beam leading-out area of the spiral deflector 2 is simultaneously used as a support body and a connector between an upper flange and a lower flange, the beam leading-out area of the spiral deflector 2 is in an irregular annular shape and is provided with an inner diameter and an outer diameter, the outer diameter is close to the edge of a beam channel in the center of the accelerator, and the wall thickness between the inner diameter and the outer diameter is as large as possible under the condition that the beam channel in the center of the accelerator is not shielded, so that the contact area between the upper flange and the lower flange is increased.

The bottom of the lower flange plate 102 is provided with a vacuumizing gap which is aligned with the spiral duct of the spiral deflector 2 upwards and aligned with a vacuumizing pump downwards, so that the partial vacuumizing of the spiral deflector 2 is strengthened;

the heat conduction ceramic assembly comprises an upper heat conduction ceramic pad 6, a lower heat conduction ceramic pad 7 and a ceramic insulation cover 8, wherein the ceramic insulation cover 8 is sleeved on the outer ring of the lower heat conduction ceramic pad 7, the plane of the ceramic insulation cover is higher than that of the lower heat conduction ceramic pad 7, one part of the ceramic insulation cover 8 in the thickness direction is overlapped, and the other part of the ceramic insulation cover is independent, so that the creepage distance for the lower flange plate 102 is increased, the creepage distance is the creepage distance from the lower deflection plate to the lower flange plate, and the lower deflection plate and the flange assembly 1 are not easy to ignite.

The volume of the upper spiral deflector 201 for heat conduction is increased by more than one time, on one hand, the increased volume by more than one time can disperse heat, thereby reducing the heat per unit volume of the upper spiral deflector 201; on the other hand, the increased volume by more than one time is used to connect with the support block one 302 through the thermally conductive ceramic pad 6, thereby taking the heat of the upper spiral deflector plate 201 through the lower flange 102.

The vacuumizing gap is additionally arranged on the lower flange plate 102, the vacuumizing gap is formed around the edge of the lower heat-conducting ceramic pad 7, and the outer diameter of the vacuumizing gap is smaller than or equal to that of the central area beam channel, so that the maximum contact area between the upper flange and the lower flange is not reduced due to the fact that the vacuumizing gap is formed.

The lower flange plate 102 is welded with a water cooling pipe 103 to cool the lower flange plate 102, the upper flange plate 101 and the lower flange plate 102 are fixed together with a beam lead-out area of the spiral deflection plate 2 between the upper flange plate 101 and the lower flange plate 102 through screws, and the lower flange plate 102 cools the upper flange plate 1 through heat conduction.

The upper insulating support component 4 is connected with the upper spiral deflection plate 201 through screws; the upper insulating support component 4 comprises a support rod component of an inner core and an insulating rod component of an outer surface, the support rod component of the inner core comprises an upper support rod 401 of which the top end is connected with the upper spiral deflection plate 201 and an upper electric shock rod 402 of which the lower end is connected with a power supply mechanism, and the upper support rod 401 is in threaded connection with the upper electric shock rod 402; the outer surface of the insulating rod assembly comprises an upper insulating column 403 located at the upper half part of the insulating support assembly 4 and a lower insulating column 404 located at the lower half part of the insulating support assembly 4.

The lower insulating support component 5 is connected with the lower spiral deflection plate 202 through screws; lower insulating supporting component 5 includes the bracing piece subassembly of inner core and the insulating rod subassembly of surface, and lower bracing piece 501 and lower electric post 502 of touching are connected through the screw, and lower electric post 502 of touching is connected through the screw with electric pole 503 of touching down to supply power to spiral deflection plate 202 down, and lower insulating post 504, lower insulating post two 505, lower insulating post three 506 and lower insulating post four 507 lower bracing piece 501, lower electric post 502 of touching, touch electric pole 503 and connecting screw and insulating on every side down.

The lower spiral deflection plate 202 is arranged on the lower heat-conducting ceramic pad 7, and the upper spiral deflection plate 202 and the lower heat-conducting ceramic pad 7 are jointly arranged on the lower flange plate 102 and fastened through screws; the lower spiral deflector plate 202 conductively dissipates heat through the lower conductive ceramic pad 7 and the lower flange 102.

The utility model has the advantages of

The utility model discloses a shape, size, proportion, position and the effect to each part in the accelerator center are improved, have gained unexpected effect: the position of the beam limiting plate assembly is improved, and the beam limiting plate assembly is supported downwards from a suspended hanger, so that two supporting blocks of the beam limiting plate assembly directly act on the upper flange plate, and the problem that heat on the upper spiral deflection plate cannot be dissipated due to the fact that the upper spiral deflection plate lacks an effective heat conducting object is solved; the volume of the upper deflection plate is doubled, the shape of the top of the upper deflection plate is enlarged and deviates to one side of the beam limiting plate assembly, so that the upper deflection plate can be connected with the beam limiting plate assembly, and the heat of the upper deflection plate can be transferred out through the beam limiting plate assembly; by improving the wall thickness of the beam channel between the upper flange and the lower flange, the thickened part can be thickened as much as possible under the condition of not shielding the beam, so that the contact area between the upper flange and the lower flange is increased, and the heat conduction effect of the upper deflection plate is enhanced; through set up evacuation gap on the ring flange down for the effect of conventional ring flange has taken place the change: the flange plate not only serves as a connecting object, but also serves as a vacuumizing channel, so that the problem that the special shape of the spiral deflection plate is not beneficial to vacuumizing is solved; the ceramic insulating cover with the plane higher than the lower ceramic insulating pad is additionally arranged on the periphery of the lower ceramic insulating pad, so that the single ceramic insulating pad is changed into the superposed ceramic insulating pad, and the overall shape, position and thickness of the ceramic insulating pad are changed, thereby solving the problem of poor ignition due to insulation.

Drawings

FIG. 1 is a perspective view of the central region structure of the present invention;

FIG. 2 is a sectional view of the center structure of the present invention;

fig. 3 is a sectional view of the upper insulating support assembly of the present invention;

fig. 4 is a top view of the lower flange plate of the present invention;

fig. 5 is a bottom view of the central region of the present invention;

in the figure: 1: a flange assembly; 101: an upper flange plate; 102: a lower flange plate; 103: a water-cooled tube; 104: a beam extraction area; 105: a beam outlet; 106: a central area beam channel; 107: vacuumizing the gap; 2: a helical deflector plate; 201: an upper helical deflector plate; 202: a lower helical deflector plate; 3: a beam limiting plate component; 301: a beam limiting plate; 302: a first supporting block; 303: a second supporting block; 4: an upper insulating support member; 401: an upper support rod; 402: the upper electric pole is contacted; 403: an upper insulating column; 404: a lower insulating column; 5: a lower insulating support assembly; 501: a lower support bar; 502: a lower contact post; 502: the lower electric pole is contacted; 504: a first lower insulating column; 505: a second lower insulating column; 506: a third lower insulating column; 507: a fourth lower insulating column; 6: an upper heat-conducting ceramic pad; 7: a lower thermally conductive ceramic pad; 8: a ceramic insulating cover;

Detailed Description

The invention will be further explained with reference to the drawings:

the design principle of the utility model

1. Improvement of the plate-limiting assembly 3: the restraint plate component 3 before being improved is not supported downwards but lifted upwards, and the upwardly lifted restraint plate component 3 is not connected with the upper flange; after improvement, the beam limiting plate 301 is supported downwards instead of being lifted upwards: the first supporting block 302 and the second supporting block 303 are respectively added on two sides, the limiting plate assembly 301 is fixed on the upper flange plate 101 through the two supporting blocks, and the first supporting block 302 and the second supporting block 303 can be made as large as possible within an allowable range, so that a large contact area for heat conduction is increased between the upper flange plate 101 and the first supporting block 302 and the second supporting block 303.

2. Modification of the upper helical deflector plate 201: the diameter of the spiral deflection plate 2 before improvement is only 4.3 cm, so that the volume of the upper deflection plate is very small, and when the beam passes through the spiral deflection plate 2, the heat is relatively more stored on the upper deflection plate per unit volume; after improvement, the diameter of the spiral deflector 2 is not changed, but the volume of the upper deflector 201 close to the first 302 supporting block 302 is doubled, after the volume is increased, the upper deflector 201 can be connected with the first 302 supporting block through the upper heat-conducting ceramic pad 6, and after the connection, the heat of the upper deflector 201 is sequentially transferred to the heat-conducting ceramic pad 6, the first 302 supporting block, the second 303 supporting block, the upper flange plate 101, and then is transferred to the cold water pipe 103 of the lower flange plate through the upper flange plate 101.

3. The improvement of the contact area between the upper flange 101 and the lower flange 102. A beam leading-out area with a beam leading-out opening of the spiral deflector 2 is arranged between the upper flange plate 101 and the lower flange plate 102, before improvement, the wall thickness of the inner diameter and the outer diameter is only a few millimeters thick, so the contact area between the upper flange plate and the lower flange plate is limited, the heat conduction effect is also limited, after improvement, the thickness can be increased to the greatest extent by adopting a method of the minimum distance between the beam track of an accelerator and the outer ring of a beam channel of the flange under the condition of not shielding the beam, the integral wall thickness of the outer diameter of the beam channel in the central area is maximized, and the contact area between the upper flange plate 101 and the lower flange plate 102 is increased.

4. Improvement of a lower flange plate. After improvement, a gap surrounding the lower heat-conducting ceramic pad 7 is formed at the bottom of the lower flange plate, the upper end of the gap is aligned with the spiral channel, the lower end of the gap is connected with a vacuum pump, and the problem of vacuum degree is solved, so that the phenomenon of sparking between the spiral deflection plate and the periphery can be avoided.

5. Modification of the lower thermally conductive ceramic pad 7: lower heat conduction ceramic pad 7's thickness is very important, heat conduction ceramic pad is thicker, be favorable to insulating more, but thicker be unfavorable for the heat conduction effect more, in addition receive the restriction of deflection plate height down, the utility model discloses a round ceramic insulation cover 8 has been set again in heat conduction ceramic pad 7's periphery, the top plane of ceramic insulation cover 8 is higher than heat conduction ceramic pad 7's top plane, the two is not on same horizontal plane for the thickness part in vertical space is coincidence, another part is independent separately, consequently it will be big than the thickness of one deck wherein to make two-layer thickness add, cause the heat conduction ceramic pad overall thickness to increase on the lower flange dish, improved insulating effect, ceramic heat conduction pad 7 has very thin improved heat conduction effect.

To summarize: the above improvements are improvements of the shape, size, proportion, position and action relation of each element on the basis of the original elements, and do not relate to newly added elements or parts: the modification of the plate restraining assembly 3 is an element position modification, from upward support to downward support, thereby obtaining an effect of increasing the heat conduction area of the upper deflector plate; the modification of the upper deflector plate 201 is an improvement of the element size, increased by one time in size, thereby obtaining the connection of the upper deflector plate and the upper flange; the improvement of the beam leading-out area of the spiral deflector 2 is the improvement of the element size, thus increasing the wall thickness of a flange beam channel and increasing the contact area between an upper flange and a lower flange; the improvement that the lower flange plate is provided with the vacuumizing gap is the improvement of element shapes, the end face of the conventional flange plate is a plane and is only used for connecting objects, and after the improvement, the end face of the flange plate is provided with the vacuumizing gap, so that the problem that the spiral pore passage of the spiral deflection plate is not beneficial to vacuumizing is solved; the improvement of the lower heat-conducting ceramic pad is the improvement of element position, size and shape, a ceramic insulating cover 8 with a plane higher than that of the lower ceramic insulating pad 7 is added, so that the single ceramic insulating pad in space is changed into a superposed ceramic insulating pad, the position, size and shape of the heat-conducting ceramic pad in space are changed, and the problem of increasing insulating thickness and avoiding ignition is solved.

Based on the principle of the utility model, the utility model designs a central area structure for BNCT accelerator, as shown in FIG. 1, FIG. 2, FIG. 3, FIG. 4, FIG. 5, including the spiral deflection board 2 that is used for deflecting the beam, this spiral deflection board 2 that is used for deflecting the beam includes upper spiral deflection board 201 and lower spiral deflection board 202, is equipped with the heliciform pore between upper and lower spiral deflection board, and this heliciform pore is used for the beam to deflect to the horizontal direction from vertical direction along the heliciform pore; the device also comprises a beam limiting plate component 3 for clamping beam current passing through the device, a flange plate component 1 for radiating the spiral deflection plate 2 and a heat conducting ceramic component; an upper insulating support assembly 4 for powering the lower helical deflector plate 201 and supporting the lower helical deflector plate 201; a lower insulating support member 5 connected to and supplying power to the lower deflection plate 202; this ring flange subassembly 1 includes ring flange 101 and lower ring flange 102, its characterized in that:

the restraint plate assembly 3 comprises a first support block 302 and a second support block 303, the spiral deflection plate 2 is fixed on the upper flange plate 101 through the first support block 302 and the second support block 303, and heat of the spiral deflection plate 2 is transmitted to the upper flange plate 101 through the first support block 302 and then transmitted to the lower flange plate 102 through the upper flange plate 101, so that heat on the spiral deflection plate 2 is taken away;

as shown in fig. 4, the middle layer of the flange plate assembly 1 is a beam extraction region 104 with a beam extraction opening 105 of a spiral deflector 2, the beam extraction region of the spiral deflector 2 is simultaneously used as a support body and a connecting body between an upper flange and a lower flange, the beam extraction region of the spiral deflector 2 is in an irregular annular shape and is provided with an inner diameter and an outer diameter, the outer diameter is close to the edge of a beam passage 106 in the center of an accelerator, and the wall thickness between the inner diameter and the outer diameter is made as large as possible under the condition that the beam passage in the center of the accelerator is not shielded, so that the contact area between the upper flange and the lower flange is increased.

As shown in fig. 5, the bottom of the lower flange plate 102 is provided with a vacuum-pumping gap 107, and the vacuum-pumping gap 107 is aligned with the spiral duct of the spiral deflector 2 upwards and aligned with the vacuum-pumping pump downwards, so as to enhance the partial vacuum-pumping of the spiral deflector 2;

as shown in fig. 2, the heat conducting ceramic assembly includes an upper heat conducting ceramic pad 6, a lower heat conducting ceramic pad 7, and a ceramic insulating cover 8, the ceramic insulating cover 8 is sleeved on the outer ring of the lower heat conducting ceramic pad 7, and the plane of the ceramic insulating cover is higher than the plane of the lower heat conducting ceramic pad 7, and one part of the thickness directions of the ceramic insulating cover 8 is overlapped and the other part is independent, thereby increasing the creepage distance for the lower flange 102, and the creepage distance is the creepage distance from the lower deflection plate to the lower flange, so that the lower deflection plate and the flange assembly 1 are not easy to ignite.

As shown in fig. 2, the volume of the upper spiral deflector 201 for heat conduction is increased by more than one time, on one hand, the increased volume by more than one time can disperse heat, thereby reducing the heat per unit volume of the upper spiral deflector 201; on the other hand, the increased volume by more than one time is used to connect with the support block one 302 through the ceramic thermally conductive insulating pad 6, thereby taking the heat of the upper spiral deflector plate 201 away through the lower flange 102.

As shown in fig. 4 and 5, the evacuation gap 107 is additionally formed in the lower flange 102, the evacuation gap 107 is formed around the edge of the lower heat-conducting ceramic pad 7, and the outer diameter of the evacuation gap is smaller than or equal to the inner diameter of the beam extraction region 104, so that the maximum contact area between the upper flange and the lower flange is not reduced due to the formation of the evacuation gap.

As shown in fig. 5, a water cooling pipe 103 is welded to the lower flange 102 to cool the lower flange 102, the upper flange 101 and the lower flange 102 are fixed together by screws with a beam lead-out area 104 therebetween, and the lower flange 102 cools the upper flange 1 by heat conduction.

As shown in fig. 3, the upper insulating support member 4 is connected to the upper spiral deflector 201 by screws; the upper insulating support component 4 comprises a support rod component of an inner core and an insulating rod component of an outer surface, the support rod component of the inner core comprises an upper support rod 401 of which the top end is connected with the upper spiral deflection plate 201 and an upper electric shock rod 402 of which the lower end is connected with a power supply mechanism, and the upper support rod 401 is in threaded connection with the upper electric shock rod 402; the outer surface of the insulating rod assembly comprises an upper insulating column 403 located at the upper half part of the insulating support assembly 4 and a lower insulating column 404 located at the lower half part of the insulating support assembly 4.

As shown in fig. 2, the lower insulating support member 5 is connected to the lower spiral deflector plate 202 by screws; lower insulating supporting component 5 includes the bracing piece subassembly of inner core and the insulating rod subassembly of surface, and lower bracing piece 501 and lower electric shock post 502 are connected through the screw thread, and lower electric shock post 502 is connected through the screw with lower electric shock post 503 to supply power to spiral deflection plate 202 down, and lower insulating post 504, lower insulating post two 505, lower insulating post three 506 and lower insulating post four 507 lower bracing piece 501, lower electric shock post 502, lower electric shock post 503 and connecting screw and insulating with around.

As shown in fig. 2, the lower spiral deflector plate 202 is disposed on the lower heat-conducting ceramic pad 7, and the lower spiral deflector plate 202 and the lower heat-conducting ceramic pad 7 are disposed on the lower flange plate 102 and fastened by screws; the lower spiral deflector plate 202 conductively dissipates heat through the lower conductive ceramic pad 7 and the lower flange 102.

The utility model relates to a center region structure for BNCT accelerator is not limited to above-mentioned embodiment, and the skilled person in the art basis the utility model discloses a technical scheme reachs other embodiments, belongs to equally the utility model discloses a technological innovation scope.

Claims

1. A central area structure for a BNCT accelerator comprises a spiral deflection plate (2) used for deflecting beam current, wherein the spiral deflection plate (2) used for deflecting beam current comprises an upper spiral deflection plate (201) and a lower spiral deflection plate (202), a spiral pore channel is arranged between the upper spiral deflection plate and the lower spiral deflection plate, and the spiral pore channel is used for deflecting the beam current from the vertical direction to the horizontal direction along the spiral pore channel; the beam limiting plate assembly (3) is used for clamping beam current passing through the beam limiting plate assembly, the flange plate assembly (1) is used for supporting and radiating the spiral deflection plate (2), and the heat conducting ceramic assembly is further included; an upper insulating support assembly (4) for supporting and powering the upper helical deflector plate (201); a lower insulating support assembly (5) connected to and supplying power to the lower deflection plate 202; the flange plate component (1) comprises an upper flange plate (101) and a lower flange plate (102),

the method is characterized in that:

the restraint plate assembly (3) comprises a first supporting block (302) and a second supporting block (303), an upper spiral deflection plate (201) is fixed on the upper flange plate (101) through the first supporting block (302) and the second supporting block (303), the upper spiral deflection plate (201) transmits heat to the upper flange plate (101) through the first supporting block (302), and then the heat is transmitted to the lower flange plate (102) through the upper flange plate (101), so that the heat on the upper spiral deflection plate (201) is taken away;

the volume of one side, close to the first support block (302), of the upper spiral deflection plate (201) is doubled, and the upper spiral deflection plate is used for being connected with the first support block (302), so that the heat of the upper spiral deflection plate (201) is transferred to the upper flange plate (101) through the first support block (302);

the middle layer of the flange disc assembly (1) is a beam leading-out area (104) with a beam leading-out opening (105) of the spiral deflector (2), the beam leading-out area of the spiral deflector (2) is simultaneously used as a support body and a connecting body between an upper flange and a lower flange, the beam leading-out area of the spiral deflector (2) is in an irregular ring shape and is provided with an inner diameter and an outer diameter, the outer diameter is close to the edge of a beam channel (106) in the center of the accelerator, and the wall thickness between the inner diameter and the outer diameter is made to be as large as possible under the condition that the beam channel in the center of the accelerator is not shielded, so that the contact area between the upper flange and the lower flange is increased;

the bottom of the lower flange plate (102) is provided with a vacuumizing gap (107), and the vacuumizing gap (107) is aligned with the spiral duct of the spiral deflection plate (2) upwards and aligned with a vacuumizing pump downwards so as to strengthen the partial vacuumizing of the spiral deflection plate (2);

the heat conduction ceramic assembly comprises an upper heat conduction ceramic pad (6), a lower heat conduction ceramic pad (7) and a ceramic insulation cover (8), wherein the ceramic insulation cover (8) is sleeved on an outer ring of the lower heat conduction ceramic pad (7), the plane of the ceramic insulation cover is higher than that of the lower heat conduction ceramic pad (7), one part of the ceramic insulation cover in the thickness direction is overlapped, and the other part of the ceramic insulation cover is independent, so that the creepage distance for the lower flange plate (102) is increased, and the creepage distance is the creepage distance from the lower deflection plate to the lower flange plate, so that the lower deflection plate and the flange plate assembly (1) are not easy to strike fire.

2. The central zone structure for a BNCT accelerator of claim 1, wherein: the volume of the upper spiral deflecting plate (201) is increased by more than one time for heat conduction, on one hand, the increased volume by more than one time can disperse heat, thereby reducing the heat per unit volume of the upper spiral deflecting plate (201); on the other hand, the increased volume by more than one time is used for connecting with the first support block (302) through the heat-conducting ceramic pad 6, so that the heat of the upper spiral deflection plate (201) is taken away through the lower flange plate (102).

3. The central zone structure for a BNCT accelerator of claim 1, wherein: the vacuumizing gap (107) is additionally arranged on the lower flange plate (102), the vacuumizing gap is formed around the edge of the lower heat-conducting ceramic pad (7), and the outer diameter of the vacuumizing gap is smaller than or equal to the inner diameter of a beam lead-out area of the spiral deflection plate (2), so that the maximum contact area between the upper flange and the lower flange is not reduced due to the fact that the vacuumizing gap is formed.

4. The central zone structure for a BNCT accelerator of claim 1, wherein: a water-cooling pipe (103) is welded on the lower flange plate (102) to cool the lower flange plate (102), the upper flange plate (101) and the lower flange plate (102) are fixed together through screws and beam lead-out areas of the spiral deflection plates (2) between the upper flange plate and the lower flange plate, and the lower flange plate (102) cools the upper flange plate (101) through heat conduction.

5. The central zone structure for a BNCT accelerator of claim 1, wherein: the upper insulating support component (4) is connected with the upper spiral deflection plate (201) through a screw; the upper insulating support assembly (4) comprises a support rod assembly of an inner core and an insulating rod assembly of an outer surface, the support rod assembly of the inner core comprises an upper support rod (401) of which the top end is connected with the upper spiral deflection plate (201) and an upper contact rod (402) of which the lower end is connected with a power supply mechanism, and the upper support rod (401) is in threaded connection with the upper contact rod (402); the insulating rod assembly on the outer surface comprises an upper insulating column (403) positioned on the upper half part of the insulating support assembly (4) and a lower insulating column (404) positioned on the lower half part of the insulating support assembly (4).

6. The central zone structure for a BNCT accelerator of claim 1, wherein: the lower insulating support component (5) is connected with the lower spiral deflection plate (202) through screws; lower insulating supporting component (5) include the bracing piece subassembly of inner core and the insulator spindle subassembly of surface, lower support bar (501) with touch electric post (502) down and be connected through the screw, touch electric post (502) down and touch electric post (503) down and be connected through the screw to spiral deflection board (202) down supplies power, lower insulator spindle one (504), lower insulator spindle two (505), lower insulator spindle three (506) and lower insulator spindle four (507) lower support bar (501), touch electric post (502) down, touch electric post (503) down and connecting screw and insulating on every side.

7. The central zone structure for a BNCT accelerator of claim 1, wherein: the lower spiral deflection plate (202) is arranged on the lower heat-conducting ceramic pad (7), and the upper spiral deflection plate (202) and the lower heat-conducting ceramic pad (7) are jointly arranged on the lower flange plate (102) and fastened through screws; the lower spiral deflection plate (202) conducts and dissipates heat through the lower heat conducting ceramic pad (7) and the lower flange plate (102).