A cooling system for a radiation conversion target

Abstract

The application relates to a cooling system for a radiation conversion target, belonging to the technical field of neutron physics and neutron sources, which comprises an inner shell and an outer shell sleeved outside the inner shell, the top of the inner shell is communicated with a cooling liquid injection cavity, the inner part of the inner shell is a cooling liquid injection flow-through cavity, the radiation conversion target is located inside the cooling liquid injection flow-through cavity, the outer shell is gap-fitted with the inner shell to form a cooling liquid injection cavity, a cooling liquid output cavity and a cooling liquid output flow-through cavity, the cooling liquid injection cavity and the cooling liquid output cavity are separately arranged, the cooling liquid output cavity is communicated with the cooling liquid injection flow-through cavity through the cooling liquid output flow-through cavity, the cooling liquid injection cavity, the cooling liquid injection flow-through cavity, the cooling liquid output flow-through cavity and the cooling liquid output cavity are sequentially communicated to form a cooling line, the target sheet of the radiation conversion target is effectively cooled, and the beam current tolerance of the radiation conversion target is improved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of neutron physics and neutron source, and particularly relates to a cooling system for a radiation conversion target. BACKGROUND

[0002] A neutron source is an extremely useful tool for nuclear data measurement research, which can provide the required nuclear data measurement for nuclear astrophysics research, nuclear energy development and utilization, and has a wide range of applications in nuclear technologies such as neutron radiography, neutron therapy and neutron irradiation effects (such as material irradiation damage, biological effects, etc.). Based on the strong current of the electron linear accelerator, a high-energy gamma ray is generated by using a high-current electron beam to bombard a radiation conversion target with a high atomic number, and the high-energy gamma ray bombards the radiation conversion target again to generate neutrons. When the high-energy electron beam bombards the radiation conversion target, almost all the electron beam energy is deposited on the target body, causing the temperature of the target body to rise instantaneously, and therefore, the radiation conversion target needs to be cooled to avoid melting damage to the target body and affect the stable operation of the device. SUMMARY

[0003] In view of the various deficiencies of the prior art, in order to solve the above problems, a cooling system for a radiation conversion target is provided.

[0004] To achieve the above-mentioned purpose, the present application provides the following technical scheme:

[0005] A cooling system for a radiation conversion target, comprising:

[0006] an inner shell, the top of which is in communication with a cooling liquid injection cavity, and the inside of which is a cooling liquid injection flow-through cavity, and the radiation conversion target is located inside the cooling liquid injection flow-through cavity;

[0007] and an outer shell which is sleeved outside the inner shell, and the outer shell and the inner shell are gap-fitted to form a cooling liquid injection cavity, a cooling liquid output cavity and a cooling liquid output flow-through cavity, the cooling liquid injection cavity and the cooling liquid output cavity are separately arranged, and the cooling liquid output cavity is in communication with the cooling liquid injection flow-through cavity through the cooling liquid output flow-through cavity.

[0008] The present application further provides that the inner shell is of a top-closed and bottom-open structure, and liquid inlet holes in communication with the cooling liquid injection cavity and mounting holes for placing the radiation conversion target are formed on the sidewall of the inner shell.

[0009] The present application further provides that the mounting holes are symmetrically arranged around the central axis of the inner shell, and the target sheet of the radiation conversion target is directly opposite the mounting holes.

[0010] The present application further provides that the liquid inlet holes are located at the top of the inner shell, and the mounting holes are located at the bottom of the inner shell.

[0011] The outer shell is of a top-open and bottom-closed structure, and an electron beam transmission window is arranged on the side wall of the outer shell and faces the mounting hole.

[0012] The cooling liquid output cavity is located below the cooling liquid injection cavity, and a liquid inlet pipe joint communicating with the cooling liquid injection cavity and a liquid outlet pipe joint communicating with the cooling liquid output cavity are arranged on the outer shell.

[0013] The top of the inner shell is provided with a liquid inlet sealing disc, and a plurality of first slits are arranged on the outer circumference of the liquid inlet sealing disc.

[0014] The outer shell is provided with a sealing snap ring, a second slit is arranged on the inner circumference of the sealing snap ring, an upper wedge block is arranged between adjacent second slits, and the distance between adjacent two first slits is smaller than the length of the second slit.

[0015] The outer shell is provided with a sealing cylinder for driving the sealing snap ring to rotate along the central axis of the outer shell.

[0016] The outer shell is provided with a support lug, and the sealing snap ring and the sealing cylinder are located above the support lug.

[0017] The inner shell is further provided with a first liquid inlet and outlet sealing disc, and the first liquid inlet and outlet sealing disc is located below the liquid inlet hole, and a positioning hole is arranged on the first liquid inlet and outlet sealing disc.

[0018] The inner wall of the outer shell is provided with a second liquid inlet and outlet sealing disc for supporting the first liquid inlet and outlet sealing disc, and a positioning pin matched with the positioning hole is arranged on the second liquid inlet and outlet sealing disc.

[0019] The outer wall of the inner shell is provided with a positioning wing, the inner wall of the outer shell is provided with a positioning wing guide corresponding to the positioning wing, and the positioning wing guide is inserted with the positioning wing.

[0020] The positioning wing guide is of a Y-shaped structure, and a plurality of positioning wing guides are uniformly distributed along the circumference of the outer shell.

[0021] The beneficial effects of the present application are:

[0022] 1. The cooling liquid injection cavity, the cooling liquid injection flow-through cavity, the cooling liquid output flow-through cavity and the cooling liquid output cavity are communicated in sequence to form a cooling circuit, which effectively dissipates heat from the target sheet of the radiation conversion target and improves the beam tolerance of the radiation conversion target.

[0023] 2. When the sealing snap ring rotates under the driving of the sealing cylinder, the upper wedge block exerts a downward force on the liquid inlet sealing disc to improve the sealing between the liquid inlet sealing disc and the outer shell and prevent the cooling liquid from leaking.

[0024] 3. The positioning wing cooperates with the positioning wing guide to preliminarily position the inner shell and the outer shell, and the positioning hole cooperates with the positioning pin to accurately position the inner shell and the outer shell, thereby improving the coaxiality of the inner shell and the outer shell.

[0025] 4. The electron beam transmission window can ensure that the electron beam is not hindered and bombards on the radiation conversion target.

[0026] 5. The radiation conversion target can be suitable for any solid target sheet material, and can also be suitable for cooling of various radioactive isotope drug production targets. Only the radiation conversion target in the mounting hole needs to be replaced with a raw material target material required for isotope drug production, and the versatility is strong. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 is a schematic diagram of the overall structure of the present application;

[0028] Figure 2 is a schematic diagram of the assembly of the present application and the mounting bracket;

[0029] Figure 3 is Figure 1 A-A sectional view in the present application;

[0030] Figure 4 is a schematic diagram of the structure of the outer shell in the present application;

[0031] Figure 5 is Figure 4 B-B sectional view in the present application;

[0032] Figure 6 is a schematic diagram of the structure of the sealing snap ring in the present application;

[0033] Figure 7 is a schematic diagram of the structure of the inner shell in the present application;

[0034] Figure 8 is Figure 7 a sectional view along the extension direction of the lifting ring;

[0035] Figure 9 is a schematic diagram of the cooling circuit in the present application.

[0036] In the drawings: 100-outer shell, 200-inner shell, 300-sealing snap ring, 400-sealing cylinder, 500-liquid inlet connector, 600-liquid outlet connector, 700-connection lug, 800-mounting frame, 900-radiation conversion target;

[0037] 101-electron beam transmission window, 102-support lug, 103-second liquid inlet and outlet sealing disc, 104-positioning pin, 105-positioning wing guide;

[0038] 201-hanging ring, 202-liquid inlet sealing disc, 203-first slot, 204-first liquid inlet and outlet sealing disc, 205-positioning hole, 206-positioning wing, 207-mounting hole;

[0039] 301-second slot, 302-upper wedge block, 303-lower wedge block, 304-snap ring wing lug;

[0040] 001-cooling liquid injection cavity, 002-cooling liquid output cavity, 003-cooling liquid injection flow-through cavity, 004-cooling liquid output flow-through cavity. DETAILED DESCRIPTION

[0041] In order to make the person skilled in the art better understand the technical solutions of the present application, the technical solutions of the present application will be described clearly and completely below in combination with the drawings of the present application. Based on the embodiments in the present application, other similar embodiments obtained by the person skilled in the art without making creative efforts shall all belong to the protection scope of the present application. In addition, the direction words mentioned in the following embodiments, such as "up", "down", "left", "right", etc. are only the directions of the drawings, therefore, the direction words used are used for illustration but not for limiting the present application.

[0042] Embodiment one:

[0043] As shown in Figure 1 , Figure 3 and Figure 9 , a cooling system for a radiation conversion target includes an inner shell 200 and an outer shell 100 sleeved outside the inner shell 200, the outer shell 100 and the inner shell 200 are gap fitted to form a cooling liquid injection cavity 001, a cooling liquid output cavity 002 and a cooling liquid output flow-through cavity 004.

[0044] Specifically, the top of the inner shell 200 is in communication with the cooling liquid injection cavity 001, the inside thereof is a cooling liquid injection flow-through cavity 003, and the radiation conversion target 900 is located inside the cooling liquid injection flow-through cavity 003. At the same time, the cooling liquid injection cavity 001 and the cooling liquid output cavity 002 are separately arranged, and the cooling liquid output cavity 002 is in communication with the cooling liquid injection flow-through cavity 003 through the cooling liquid output flow-through cavity 004.

[0045] It is worth mentioning that the cooling liquid injection cavity 001, the cooling liquid injection flow-through cavity 003, the cooling liquid output flow-through cavity 004 and the cooling liquid output cavity 002 are sequentially communicated to form a cooling circuit, and the target sheet of the radiation conversion target 900 is cooled to improve the beam tolerance of the radiation conversion target 900.

[0046] The technical scheme is further provided that the radiation conversion target 900 adopts a laminated target structure, specifically, a plurality of target sheet gaps are arranged and loaded in the target holder to form the radiation conversion target 900, and the cooling liquid flows from top to bottom in the gap between adjacent target sheets to cool the radiation conversion target 900.

[0047] It is worth mentioning that the cooling liquid generally adopts heavy water or light water, and the cooling liquid irradiated by high-energy electron beams or neutrons will produce undesirable substances that corrode the target sheet, such as hydrogen peroxide, hydrogen and other products, therefore, a protective layer is plated on the target sheet to improve the corrosion life of the radiation conversion target 900. Preferably, the material of the protective layer is Cr-N, Cr-C or Cr-C-N, which has the characteristics of anti-hydrogen peroxide corrosion, high temperature resistance, wear resistance and the like.

[0048] As shown in Figure 2 The outer wall of the outer shell 100 is provided with a connecting lug 700, the connecting lug 700 is connected with the mounting frame 800 through bolts and is fixed on the working surface to ensure stability.

[0049] As shown in Figure 3 and Figure 7 The inner shell 200 is a structure with a closed top and an open bottom, and a liquid inlet hole communicated with the cooling liquid injection cavity 001 and a mounting hole 207 for placing the radiation conversion target 900 are formed in the side wall of the inner shell 200.

[0050] Specifically, the liquid inlet hole is located at the top of the inner shell 200, and the mounting hole 207 is located at the bottom of the inner shell 200.

[0051] In this embodiment, the liquid inlet hole is a circular hole and / or a waist-shaped hole, and the mounting hole 207 is a square hole.

[0052] It is worth mentioning that the mounting hole 207 is matched with the gap of the radiation conversion target 900, and a guide groove is arranged at the bottom of the mounting hole 207 to ensure that the radiation conversion target 900 can be smoothly pushed in and out.

[0053] The technical scheme is further provided that the mounting hole 207 is symmetrically provided with two around the central axis of the inner shell 200, and the target sheet of the radiation conversion target 900 is opposite to the mounting hole. Correspondingly, the bottom surface of the inner shell 200 opposite to the radiation conversion target 900 is a non-closed structure, which is convenient for the flow of the cooling liquid.

[0054] As Figure 1 and Figure 4 shown, the outer shell 100 is a top open and bottom closed structure, and the sidewall of the outer shell 100 is provided with an electron beam transmission window 101 opposite to the mounting hole 207.

[0055] It is worth noting that the electron beam transmission window 101 can ensure that the electron beam is not hindered to bombard the radiation conversion target 900. Preferably, the material of the electron beam transmission window 101 is diamond, and its diameter is designed to be about 20-35 mm according to the diameter of the electron beam, and at the same time, the strength of the diamond can withstand the passage of high-pressure cooling liquid without being damaged, and has corrosion resistance.

[0056] As Figure 1 , Figure 3 and Figure 9 shown, the cooling liquid output cavity 002 is located below the cooling liquid injection cavity 001, and the outer shell 100 is provided with a liquid inlet pipe joint 500 in communication with the cooling liquid injection cavity 001 and a liquid outlet pipe joint 600 in communication with the cooling liquid output cavity 002.

[0057] It is worth noting that the cooling liquid is injected into the cooling liquid injection cavity 001 through the liquid inlet pipe joint 500, and the cooling liquid in the cooling liquid output cavity 002 is discharged by the liquid outlet pipe joint 600. Preferably, the liquid inlet pipe joint 500 is symmetrically provided with 2 around the central axis of the outer shell 100, and the liquid outlet pipe joint 600 is symmetrically provided with 2 around the central axis of the outer shell 100.

[0058] As Figure 7 and Figure 8 shown, the top of the inner shell 200 is provided with a liquid inlet sealing disc 202, and the liquid inlet sealing disc 202 is circular, and a plurality of first grooves 203 are arranged on the outer circumference of the liquid inlet sealing disc 202.

[0059] The technical solution is further provided that the liquid inlet sealing disc 202 is provided with a lifting ring 201, the lifting ring 201 is inverted U-shaped and welded on the liquid inlet sealing disc 202, and the lifting ring 201 is connected with the target lifting hook, which is used to lift the inner shell 200 and the radiation conversion target 900 away from the outer shell 100.

[0060] As Figure 1 , Figure 3 , Figure 6 and Figure 7 shown, the outer shell 200 is provided with a sealing ring 300, and the inner circumference of the sealing ring 300 is provided with a plurality of second grooves 301.

[0061] It is worth mentioning that the part between the adjacent two first grooves 203 can pass through the second groove 301, that is, the interval of the adjacent two first grooves 203 is smaller than the groove length of the second groove 301. At the same time, the inclined surface of the upper wedge block 302 is arranged towards the radiation conversion target 900.

[0062] The technical scheme is further provided that the inner circumference of the sealing snap ring 300 is provided with a plurality of groups of upper and lower symmetric upper wedge blocks 302 and lower wedge blocks 303 at intervals.

[0063] It is worth mentioning that the maximum interval of the lower wedge block 303 and the upper wedge block 302 is greater than the thickness of the liquid inlet sealing disc 202, and the minimum interval of the lower wedge block 303 and the upper wedge block 302 is smaller than the thickness of the liquid inlet sealing disc 202.

[0064] The technical scheme is further provided that the outer shell 100 is provided with a sealing cylinder 400 for driving the sealing snap ring 300 to rotate along the central axis of the outer shell 100.

[0065] The technical scheme is further provided that the outer shell 100 is provided with a support lug 102, and the sealing snap ring 300 and the sealing cylinder 400 are located above the support lug 102.

[0066] Specifically, the cylinder end of the sealing cylinder 400 is fixedly connected with the support lug 102, the outer circumference of the sealing snap ring 300 is provided with a snap ring wing lug 304, and the piston end of the sealing cylinder 400 is hingedly connected with the snap ring wing lug 304.

[0067] It is worth mentioning that when the sealing snap ring 300 rotates under the driving of the sealing cylinder 400, the upper wedge block 302 and the lower wedge block 303 rotate under the driving of the sealing snap ring 300, the upper wedge block 302 exerts a downward force on the liquid inlet sealing disc 202 to improve the sealing property between the liquid inlet sealing disc 202 and the outer shell 100, prevent the cooling liquid from leaking, and achieve the purpose of waterway sealing.

[0068] Preferably, the sealing cylinder 400 is provided with two sealing cylinders 400, and the setting directions of the two sealing cylinders 400 are opposite, so that the sealing snap ring 300 rotates and forms a pair of force couples when the two sealing cylinders 400 are started at the same time.

[0069] As shown in Figure 5 and Figure 7 The inner shell 200 is further provided with a first liquid inlet and outlet sealing disc 204, and the first liquid inlet and outlet sealing disc 204 is located below the liquid inlet hole, and the first liquid inlet and outlet sealing disc 204 is provided with a positioning hole 205.

[0070] The technical scheme is further provided with a second inlet and outlet liquid sealing disc 103 for supporting the first inlet and outlet liquid sealing disc 204 on the inner wall of the outer shell 100, and the second inlet and outlet liquid sealing disc 103 is provided with a positioning pin 104 matched with the positioning hole 205.

[0071] It is worth noting that the first inlet and outlet liquid sealing disc 204 cooperates with the second inlet and outlet liquid sealing disc 103 to separate the cooling liquid injection cavity 001 from the cooling liquid output cavity 002.

[0072] The technical scheme is further provided with a positioning wing 206 on the outer wall of the inner shell 200, and a positioning wing guide 105 corresponding to the positioning wing 206 is arranged on the inner wall of the outer shell 100, and the positioning wing guide 105 is inserted with the positioning wing 206.

[0073] The technical scheme is further provided with a positioning wing guide 105 in Y-shaped structure, and the opening of the Y-shaped structure is upward. Meanwhile, the positioning wing guide 105 is uniformly distributed along the circumference of the outer shell 100, and correspondingly, the positioning wing 206 is uniformly distributed along the circumference of the inner shell 200.

[0074] It is worth noting that the positioning wing 206 cooperates with the positioning wing guide 105 to preliminarily position the inner shell 200 and the outer shell 100, and the positioning hole 205 cooperates with the positioning pin 104 to accurately position the inner shell 200 and the outer shell 100, thereby improving the coaxiality of the inner shell 200 and the outer shell 100.

[0075] When in use, the inner housing 200 is coaxially inserted into the outer housing 100 from the top, and the positioning wing 206 is guided downward by the positioning wing guide 105, which ensures the coaxiality of the inner housing 200 and the outer housing 100 and plays a preliminary positioning role. When the positioning pin 104 is embedded in the positioning hole 205, the inner housing 200 is precisely positioned on the axis of the outer housing 100. The sealing cylinder 400 is started, and under the drive of the sealing cylinder 400, the sealing snap ring 300 rotates, and the upper wedge block 302 exerts a downward force on the inlet sealing disc 202, thereby realizing the sealing of the water inlet channel. At the same time, the cooling liquid injection cavity 001, the cooling liquid output cavity 002, and the cooling liquid output flow-through cavity 004 are formed between the inner housing 200 and the outer housing 100. The cooling liquid injected through the inlet pipe joint 500 enters the cooling liquid injection cavity 001, flows into the cooling liquid injection flow-through cavity through the inlet hole, and the high-pressure cooling liquid in the cooling liquid injection flow-through cavity is squeezed into the target gap. The heat deposited on the radiation conversion target 900 is cooled by the high-pressure cooling liquid. The cooling liquid flowing out of the target gap enters the outer housing 100, then flows into the cooling liquid output cavity 002 through the gap (cooling liquid output flow-through cavity 004) between the outer housing 100 and the inner housing 200, and flows out of the outlet pipe joint 600, thereby forming a cooling water channel for the radiation conversion target 900.

[0076] The above has made a detailed description of the present application, and the above description is only a preferred embodiment of the present application. The above description cannot limit the scope of the present application, that is, any equivalent changes and modifications made within the scope of the present application should still fall within the scope of the present application.

Claims

1. A cooling system for a radiation conversion target, characterized in that, include: The inner shell has its top connected to the coolant injection chamber, and its interior is the coolant injection flow chamber, with the radiation conversion target located inside the coolant injection flow chamber. And an outer shell fitted outside the inner shell, the outer shell and the inner shell being clearance-fitted to form a coolant injection chamber, a coolant output chamber and a coolant output flow chamber, the coolant injection chamber and the coolant output chamber being separated, and the coolant output chamber communicating with the coolant injection flow chamber through the coolant output flow chamber; The radiation conversion target adopts a stacked target structure, with multiple target pieces arranged with gaps and loaded in the target holder to form a radiation conversion target. Coolant flows from top to bottom through the gaps between adjacent target pieces to dissipate heat and cool the radiation conversion target. The inner shell has a closed top and an open bottom structure, and its side wall has an inlet hole communicating with the coolant injection chamber and an mounting hole for placing the radiation conversion target. The outer shell has an open top and a closed bottom structure, and its side wall has an electron beam transmission window facing the mounting hole.

2. The cooling system for a radiation conversion target according to claim 1, characterized in that, The top of the inner shell is provided with a liquid inlet sealing plate, and the outer circumference of the liquid inlet sealing plate is provided with a plurality of spaced first slots.

3. A cooling system for a radiation conversion target according to claim 2, characterized in that, The outer shell is fitted with a sealing ring, and the inner circumference of the sealing ring is provided with second slots spaced apart. An upper wedge block is provided between adjacent second slots, and the distance between two adjacent first slots is less than the length of the second slot.

4. A cooling system for a radiation conversion target according to claim 3, characterized in that, The outer casing is equipped with a sealing cylinder that drives the sealing ring to rotate along the central axis of the outer casing.

5. A cooling system for a radiation conversion target according to claim 1, characterized in that, The inner shell is also provided with a first liquid inlet / outlet sealing plate, and the first liquid inlet / outlet sealing plate is located below the liquid inlet hole. The first liquid inlet / outlet sealing plate is provided with a positioning hole.

6. A cooling system for a radiation conversion target according to claim 5, characterized in that, The inner wall of the outer casing is provided with a second inlet / outlet sealing plate for supporting the first inlet / outlet sealing plate, and the second inlet / outlet sealing plate is provided with a positioning pin that matches the positioning hole.

7. A cooling system for a radiation conversion target according to any one of claims 1-6, characterized in that, The outer wall of the inner shell is provided with a positioning wing, and the inner wall of the outer shell is provided with a positioning wing guide corresponding to the positioning wing, and the positioning wing guide is inserted into the positioning wing.

8. A cooling system for a radiation conversion target according to claim 7, characterized in that, The positioning wing guide has a Y-shaped structure, and multiple positioning wing guides are evenly distributed along the circumference of the outer shell.

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