Ray conversion target, ray source and irradiation device

Abstract

A ray conversion target (100), comprising a target body (1), a target portion (2) and a heat dissipation portion, wherein the target portion (2) is arranged inside the target body (1), and the target portion (2) has a first face and a second face arranged opposite each other, the first face being configured to generate rays; and the heat dissipation portion is configured to accommodate a heat dissipation fluid and is at least partially located on the second face of the target portion (2). A fluid inlet of the heat dissipation portion is divided into N first sub-inlets (31), each of the first sub-inlets (31) being in communication with a corresponding first flow channel (32), where N is an integer greater than or equal to 2. Each of the first sub-inlets (31) is different from at least one of the other first sub-inlets in terms of size, and the N first sub-inlets (31) are configured to regulate the flow rate of the fluid in each first flow channel (32). Further provided are a ray source and an irradiation device.

Description

Radiation conversion target, radiation source and irradiation device Technical Field

[0001] The present disclosure relates to the field of irradiation technology, security inspection technology or other fields, and more particularly to a ray conversion target, a ray source and an irradiation device. Background Art

[0002] As demand for industrial irradiation continues to grow and irradiation technology continues to advance, irradiation equipment is increasingly being applied in a variety of new fields. For example, irradiation equipment is used to modify products, sterilize food in the food industry, and in agriculture for seed breeding, yield stimulation, and pest control. It is also used in security inspections for specific items, and in the medical industry for medical imaging and treatment.

[0003] Irradiation devices are equipped with electron-to-radiation conversion targets to generate radiation (such as X-rays or other radiation). The heat dissipation structure of the target is a crucial aspect of its design. Existing radiation conversion target heat dissipation designs typically utilize water cooling, for example, using a single water channel or multiple water channels in parallel.

[0004] During the development of the disclosed invention, the inventors discovered that the varying flow resistances of multiple parallel channels often lead to uneven flow distribution within each channel. Within a single channel, uneven flow velocity distribution can also occur. In areas of low flow velocity and near-zero dead water, low heat dissipation efficiency often leads to excessively high temperature rises, resulting in the conversion target burning due to inadequate heat dissipation. Summary of the Invention

[0005] In view of the above problems, the present disclosure provides a radiation conversion target, a radiation source, and an irradiation device.

[0006] One aspect of the embodiments of the present disclosure provides a radiation conversion target, comprising:

[0007] target;

[0008] a target portion disposed inside the target body, the target portion having a first surface and a second surface opposite to each other, the first surface being configured to generate radiation;

[0009] a heat dissipation portion configured to accommodate a heat dissipation fluid and at least partially located on the second surface of the target portion, wherein a fluid inlet of the heat dissipation portion is divided into N first sub-inlets, each of the first sub-inlets is connected to a corresponding first flow channel, and N is an integer greater than or equal to 2;

[0010] Each of the first sub-inlets has a different size from at least one of the other first sub-inlets, and the N first sub-inlets are configured to adjust the flow rate of the fluid flowing into each first flow channel.

[0011] According to an embodiment of the present disclosure, the heat dissipation unit includes:

[0012] a first heat dissipation slot, located on the second surface of the target portion;

[0013] a second heat dissipation slot, located on one side of the first heat dissipation slot, comprising N first sub-inlets and N first flow channels;

[0014] a third heat dissipation slot, opposite to the second heat dissipation slot and located on the other side of the first heat dissipation slot;

[0015] The first heat dissipation slot, the second heat dissipation slot and the third heat dissipation slot are connected in a circuitous manner, and the fluid passes through the second heat dissipation slot, the first heat dissipation slot and the third heat dissipation slot in sequence to absorb the heat of the target.

[0016] According to an embodiment of the present disclosure, the second heat dissipation slot further includes:

[0017] N-1 first baffles, any one of the first baffles standing upright in the second heat dissipation slot;

[0018] The N first sub-entries include at least one of the following:

[0019] A first sub-inlet defined by cooperation between any two adjacent first partitions;

[0020] a first sub-inlet defined by cooperation between any one of the first partitions and the first side wall of the second heat dissipation slot;

[0021] Any one of the first partitions cooperates with the second side wall of the second heat dissipation slot to define a first sub-inlet, the second side wall is a partition between the second heat dissipation slot and the first heat dissipation slot, and the first side wall is opposite to the second side wall.

[0022] According to an embodiment of the present disclosure, at least one of the first separators includes:

[0023] a first end portion configured to cooperate with a first end portion of an adjacent first partition plate to define the first sub-inlet, or configured to cooperate with the first side wall or the second side wall to define the first sub-inlet;

[0024] The end of the first end portion is beveled, and the beveled surface intersects with a plate surface of the first partition plate. When viewed from above, the end of the first end portion is roughly triangular.

[0025] According to an embodiment of the present disclosure, a first ramp is provided at the bottom of at least one of the first sub-inlets, and the first ramp is configured to gradually rise along the fluid flow direction until it is flush with the bottom of the first flow channel connected to the first sub-inlet above.

[0026] According to an embodiment of the present disclosure, when the first ramp is respectively provided below at least two of the first sub-entrances, the slope of any one of the first ramps may be the same as or different from the slope of at least one of the other first ramps.

[0027] According to an embodiment of the present disclosure, the second heat dissipation slot includes N first sub-outlets corresponding one-to-one to the N first sub-inlets, and each of the sub-outlets is connected to a first flow channel;

[0028] A second ramp is provided at the bottom of at least one of the first sub-outlets, and the second ramp is configured to gradually decrease along the flow direction of the fluid.

[0029] According to an embodiment of the present disclosure, a first arc-shaped corner is provided at the connection point between the second heat dissipation slot and the first heat dissipation slot, and the fluid in the second heat dissipation slot enters the first heat dissipation slot after being constrained by the first arc-shaped corner.

[0030] According to an embodiment of the present disclosure, a third ramp is provided at the bottom of the fluid inlet of the first heat dissipation slot, and the third ramp is configured to gradually rise along the fluid flow direction.

[0031] According to an embodiment of the present disclosure, the third heat dissipation slot includes:

[0032] M second flow channels;

[0033] M second sub-inlets, each of which is connected to a corresponding second flow channel, where M is an integer greater than or equal to 2;

[0034] Each of the second sub-inlets has a different size from at least one of the other second sub-inlets, and the M second sub-inlets are respectively configured to adjust the flow rate of the fluid flowing into the connected second flow channel.

[0035] According to an embodiment of the present disclosure, the third heat dissipation slot further includes:

[0036] M-1 second baffles, any of which is erected in the third heat dissipation slot;

[0037] The M second sub-entries include at least one of the following:

[0038] A second sub-inlet defined by the cooperation of any two adjacent second partitions;

[0039] A second sub-inlet defined by cooperation between any one of the second partitions and the third side wall of the third heat dissipation slot, wherein the third side wall is a partition between the third heat dissipation slot and the first heat dissipation slot;

[0040] Any one of the second partitions cooperates with the fourth side wall of the third heat dissipation slot to define a second sub-inlet, and the third side wall is opposite to the fourth side wall.

[0041] According to an embodiment of the present disclosure, at least one second separator comprises:

[0042] The third end portion is directed toward the fluid outlet of the first heat dissipation slot and is configured to cooperate with the third end portion of the adjacent second partition plate to define the second sub-inlet, or to cooperate with the adjacent third side wall or the fourth side wall to define the second sub-inlet;

[0043] Wherein, when viewed from a top direction, the third end portion is hook-shaped, and the end of the third end portion is configured to extend in an arc shape from the fluid outlet of the first heat dissipation groove into the third heat dissipation groove to form the hook shape.

[0044] According to an embodiment of the present disclosure, the end of the third end portion is beveled, and the beveled surface intersects with the arc surface of the third end portion. When viewed from above, the end of the third end portion is roughly triangular.

[0045] According to an embodiment of the present disclosure, the M second sub-entries include at least one of the following:

[0046] A second sub-inlet is defined by the second arc-shaped corner and the third end of the adjacent second partition, the second arc-shaped corner being provided on the fourth side wall and being located at the connection between the third heat dissipation slot and the first heat dissipation slot;

[0047] a second sub-inlet defined by the third ends of any two adjacent second baffles, wherein for any two second baffles, the third ends of each are configured such that the closer they are to the second arc-shaped corner, the longer the arc length becomes;

[0048] The third end of the single second partition plate cooperates with the third side wall to define a second sub-inlet.

[0049] According to an embodiment of the present disclosure, the second heat dissipation slot is substantially parallel to the first heat dissipation slot, and the fluid flows in opposite directions, and the third heat dissipation slot is substantially parallel to the first heat dissipation slot, and the fluid flows in opposite directions.

[0050] Another aspect of the embodiments of the present disclosure provides a ray source, comprising the ray conversion target as described in any one of the above items.

[0051] Another aspect of the embodiments of the present disclosure provides an irradiation device, comprising the ray source as described above.

[0052] One or more of the above-mentioned embodiments have the following beneficial effects: the flow path layout and structure of the heat dissipation part are changed, and the fluid inlet of the heat dissipation part is divided into N first sub-inlets, and each first sub-inlet is correspondingly connected to a first flow channel. Since the size of each first sub-inlet is different from that of at least one other first sub-inlet, the fluid flow rate allowed to pass through per unit time is also different, so the fluid flow rate in the connected first flow channel can be adjusted to avoid the situation of low flow rate and low flow velocity, solve the problem of excessive local temperature rise, improve the heat dissipation efficiency, and extend the service life of the radiation conversion target. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] The above contents and other objects, features and advantages of the present disclosure will become more apparent through the following description of the embodiments of the present disclosure with reference to the accompanying drawings, in which:

[0054] FIG1 schematically shows a flow velocity simulation diagram of an existing multi-channel parallel design;

[0055] FIG2 schematically shows a transverse cross-sectional view of a ray conversion target according to an embodiment of the present disclosure;

[0056] FIG3 schematically shows a top cross-sectional view of a heat dissipation portion of a radiation conversion target according to an embodiment of the present disclosure;

[0057] FIG4 schematically shows a cross-sectional view of a ray conversion target according to an embodiment of the present disclosure;

[0058] FIG5 schematically shows a simple structural diagram of a first end portion according to an embodiment of the present disclosure;

[0059] FIG6 schematically shows a simple structural diagram of a second separator according to an embodiment of the present disclosure; and

[0060] FIG7 schematically shows a flow velocity simulation diagram of a heat dissipation fluid in a ray conversion target according to an embodiment of the present disclosure.

[0061] The reference numerals involved in the accompanying drawings are as follows: A, inlet; B, return outlet; 100, ray conversion target; 1, target body; 2, target part; 3, second heat dissipation slot; 31, first sub-inlet; 32, first flow channel; 33, first partition; 331, first end; 3311, beveled surface at the end of the first end; 3312, plate surface; 34, first sub-outlet; 35, first ramp; 36, second ramp; 37, first side wall; 38, second side wall; 4, first heat dissipation slot; 41, third ramp; 5, third heat dissipation slot; 51, second flow channel; 52, second sub-inlet; 53, second partition; 531, third end; 5311, beveled surface at the end of the third end; 5312, arc surface; 532, rectangular part; 54, third side wall; 55, fourth side wall; 6, first arc corner; 7, second arc corner; 8, cover plate.

[0062] It should be noted that, for the sake of clarity, in the drawings used to describe the embodiments of the present disclosure, the sizes of the overall / local structures or overall / local areas may be enlarged or reduced, that is, these drawings are not drawn according to the actual scale. DETAILED DESCRIPTION

[0063] Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings. However, it should be understood that these descriptions are merely exemplary and are not intended to limit the scope of the present disclosure. In the detailed description below, for ease of explanation, many specific details are set forth to provide a comprehensive understanding of the embodiments of the present disclosure. However, it is apparent that one or more embodiments may also be implemented without these specific details. In addition, in the following description, descriptions of well-known structures and technologies are omitted to avoid unnecessary confusion of the concepts of the present disclosure.

[0064] Taking electron accelerators as an example, with the increasing demand for industrial irradiation and the continuous advancement of electron accelerator technology, high-power electron accelerators are increasingly being applied in various new fields. Consequently, different usage requirements are constantly placing new demands on the beam power of electron accelerators. For example, in high-power industrial irradiation or electron accelerators used for mineral composition analysis, which use accelerators as radiation sources, the electron-to-X-ray conversion target is a key component of the accelerator.

[0065] Specifically, high-power, high-energy X-rays can be generated by bombarding high-atomic-number target materials with high-power, high-energy electron beams. The X-rays are released through the bremsstrahlung process between the electrons and the material. Increasing the electron beam power increases the heat generated by the X-ray conversion target, placing higher demands on the target's heat dissipation capacity. Therefore, higher-power conversion targets require higher overall heat dissipation capacity.

[0066] In the related art, referring to the flow velocity simulation diagram of the existing multi-water channel parallel design shown in FIG1 , the existing target heat dissipation structure has uneven flow velocity in the water channel, resulting in excessive temperature rise in low flow velocity areas and dead water areas where the flow velocity is close to zero due to low heat dissipation efficiency. As shown in FIG1 , the irradiation working area is facing the target part bombarded by the electron beam. This part generates high heat and urgently needs to dissipate heat quickly. However, due to the defect of uneven flow velocity, the flow velocity in the irradiation working area is too low, and even a dead water area is formed, making it difficult for the fluid to take away the heat in time. Furthermore, when the temperature rises to the boiling point of water, tiny water vapor bubbles will be generated on the inner surface of the water channel. At this time, if the small bubbles cannot be carried away by the water flow in time, the heat dissipation efficiency from the target body to the water body will be greatly reduced, thereby generating more bubbles, forming air plugs, and eventually causing damage to the target body.

[0067] In some embodiments, the target's water-cooling structure is often designed to increase water flow, disperse the beam over a larger surface, and reduce heat generation per unit area to avoid excessive local temperature rise. However, the heat dissipation effect is still not ideal, and the original structure of the radiation conversion target may be significantly modified, affecting the radiation output effect.

[0068] According to the ray conversion target provided in some embodiments of the present disclosure, the flow path layout and structure of the heat dissipation part are changed, and the fluid inlet of the heat dissipation part is divided into N first sub-inlets, and each first sub-inlet is correspondingly connected to a first flow channel. Since the size of each first sub-inlet is different from that of at least one other first sub-inlet, the fluid flow rate allowed to pass through per unit time is also different. Therefore, the fluid flow rate in the connected first flow channel can be adjusted to avoid the situation of low flow rate and low flow velocity, solve the problem of excessive local temperature rise, improve the heat dissipation efficiency, and extend the service life of the ray conversion target.

[0069] Figure 2 schematically illustrates a transverse cross-sectional view of a radiation conversion target according to an embodiment of the present disclosure. Figure 3 schematically illustrates a top cross-sectional view of the heat dissipation portion of a radiation conversion target according to an embodiment of the present disclosure. Figure 4 schematically illustrates a cross-sectional view of a radiation conversion target according to an embodiment of the present disclosure. Figure 4 is a cross-sectional view taken perpendicular to the paper plane of Figure 3 and parallel to the direction of the water channel in the irradiation working area.

[0070] In some embodiments, a radiation conversion target 100 includes a target body 1, a target portion 2, and a heat sink. The target portion 2 is disposed within the target body 1 and has opposing first and second surfaces. The first surface is configured to generate radiation. The heat sink is configured to contain a heat dissipation fluid and is at least partially located on the second surface of the target portion 2. The fluid inlet of the heat sink is divided into N first sub-inlets 31, each of which is connected to a corresponding first flow channel 32, where N is an integer greater than or equal to 2. Each first sub-inlet 31 is of a different size than at least one other first sub-inlet. The N first sub-inlets 31 are configured to regulate the flow rate of the fluid into each first flow channel 32. For example, the flow rate regulation can be used to maintain approximately the same flow rate within each first flow channel 32.

[0071] Referring to Figure 2 , in operation, a high-energy electron beam is perpendicularly incident on the first surface of the target portion 2, for example, formed of copper, to generate X-rays. Simultaneously, a portion of the high-energy electrons serve as counter-electrons. The first surface can be a generally planar surface. The bombardment of the high-energy electrons causes the temperature of the target portion 2 to rise. The heat generated by the target portion 2 can be transferred from the target body 1, for example, from the first surface to a portion of the heat dissipation portion of the second surface, where it is carried away by the fluid in the heat dissipation portion, thereby preventing a rapid increase in the temperature of the target portion 2.

[0072] As shown in Figures 2 to 4 , the second surface and the first surface are the two opposite surfaces of the target portion 2. When a heat dissipation fluid flows in the heat dissipation portion, the second surface of the target portion 2 is in direct contact with the fluid. Some heat is carried away by the fluid, and the temperature of the second surface of the target portion 2 decreases, thereby forming a temperature difference between the first and second surfaces of the target portion 2. Heat in the target portion 2 is rapidly transferred from the first surface to the second surface of the target portion 2, thereby suppressing the temperature increase of the first surface of the target portion 2.

[0073] In some embodiments, as shown in Figure 3 , at least one first sub-inlet 31 gradually narrows along the fluid flow direction until it connects to the connected flow channel, increasing flow rate while gradually transitioning into the flow channel. Alternatively, any two first sub-inlets 31 may be of different sizes, thereby adjusting the fluid flow rate per unit time and thus varying parameters such as flow resistance, flow velocity, and flow rate within the connected flow channel.

[0074] 1 to 4 , when the fluid flows out from the inlet A, the fluid flow rate or flow velocity in each direction is different. By setting the size of each first sub-inlet 31 to intercept the flow rate that matches the connected flow channel, a uniform flow velocity between the flow channels is achieved.

[0075] For example, before N first sub-inlets 31 are provided, a certain flow channel receives a low flow rate, resulting in a low-velocity zone within the channel and poor heat dissipation. In some embodiments of the present disclosure, enlarging the first sub-inlet 31 of this flow channel allows more fluid to enter, thereby increasing the flow rate. Similarly, other flow channels can enlarge or reduce the first sub-inlet 31 based on actual flow rates.

[0076] In some embodiments, a high atomic number material such as gold or tungsten can be provided on the surface of the target portion 2. For example, a gold layer can be provided on the surface of a copper target portion 2 to obtain a composite target portion 2, which can produce a higher dose yield of X-rays with the same energy of a high-energy electron beam.

[0077] According to the embodiments of the present disclosure, while the working area of ​​the target portion 2 of the radiation conversion target 100 remains unchanged, by changing the layout and structure of the rear water channel, the flow rate of the fluid in each first flow channel 32 is made substantially the same, thereby solving the problem of excessive local temperature rise, improving the heat dissipation efficiency, and extending the service life of the radiation conversion target 100.

[0078] In some embodiments, referring to FIG2 , the heat dissipation portion includes a first heat dissipation slot 4, a second heat dissipation slot 3, and a third heat dissipation slot 5. The first heat dissipation slot 4 is located on the second surface of the target portion 2; the second heat dissipation slot 3 is located on one side of the first heat dissipation slot 4 and includes N first sub-inlets 31 and N first flow channels 32; the third heat dissipation slot 5 is located opposite the second heat dissipation slot 3 and on the other side of the first heat dissipation slot 4; wherein the first heat dissipation slot 4, the second heat dissipation slot 3, and the third heat dissipation slot 5 are connected in a circuitous manner, and the fluid passes through the second heat dissipation slot 3, the first heat dissipation slot 4, and the third heat dissipation slot 5 in sequence to absorb the heat of the target 1.

[0079] For example, the circuitous connection may include a serpentine, curved or S-shaped connection. In addition, the first heat dissipation slot 4, the second heat dissipation slot 3 and the third heat dissipation slot are formed as serial fluid channels to avoid the problem of uneven flow rate in a multi-channel parallel design.

[0080] 3 , the second heat dissipation slot 3 is substantially parallel to the first heat dissipation slot 4 , and the fluid flows in opposite directions, and the third heat dissipation slot 5 is substantially parallel to the first heat dissipation slot 4 , and the fluid flows in opposite directions.

[0081] In some embodiments, as shown in FIG3 , the equivalent cross-section of either the comb-shaped water channel in the water inlet area (i.e., the second heat dissipation slot 3 ) or the comb-shaped water channel in the water return area (i.e., the third heat dissipation slot 5 ) is larger than the equivalent cross-section of the water channel in the irradiation working area (i.e., the first heat dissipation slot 4 ), thereby increasing the flow rate in the first heat dissipation slot 4 .

[0082] Exemplarily, any one of the first heat dissipation slot 4 , the second heat dissipation slot 3 and the third heat dissipation slot 5 may have a vertical or inclined side wall. In other words, any heat dissipation slot may have an inverted trapezoidal cross-sectional shape, a rectangular cross-sectional shape or other shapes.

[0083] For example, the heat dissipation fluid can be a liquid, such as water with a high specific heat capacity. When a localized area of ​​the target portion 2, such as the first surface, reaches a high temperature due to bombardment by the high-energy electron beam, the water in contact with the target portion 2 may partially vaporize and boil, forming air gaps, which significantly reduces the heat dissipation effect. Because of the serial water channel, when bubbles are generated, they can be forcibly removed by the high-speed water flow, preventing air locks that could reduce heat dissipation efficiency.

[0084] In some embodiments, the second heat dissipation slot 3 also includes N-1 first partitions 33, and any first partition 33 is erected in the second heat dissipation slot 3; wherein, any two adjacent first partitions 33 cooperate with each other and / or the side walls of the second heat dissipation slot 3 cooperate with adjacent first partitions 33 to define N first sub-inlets 31 and N first flow channels 32.

[0085] Exemplarily, as shown in Figure 3, the N first sub-inlets 31 include at least one of the following: a first sub-inlet 31 defined by the cooperation of any two adjacent first partitions 33; a first sub-inlet 31 defined by the cooperation of any first partition 33 and the first side wall 37 of the second heat dissipation groove 3; a first sub-inlet 31 defined by the cooperation of any first partition 33 and the second side wall 38 of the second heat dissipation groove 3, the second side wall 38 being a partition between the second heat dissipation groove 3 and the first heat dissipation groove, and the first side wall 37 is opposite to the second side wall 38.

[0086] For example, the vertical structure can include a first baffle 33 perpendicular to the bottom of the second heat dissipation tank 3. The first baffle 33 can be made of copper. Referring to Figure 3, the provision of N-1 first baffles 33, combined with the multiple first flow channels 32 in the second heat dissipation tank 3, forms a comb-shaped water channel, increasing the effective contact area between the fluid and the copper, expanding the effective heat dissipation area, and improving heat dissipation efficiency.

[0087] In some embodiments, the target body 1 and each first partition plate 33 may be an integral structure, so that the heat generated by the target portion 2 can be transferred more quickly.

[0088] FIG5 schematically shows a simple structural diagram of the first end portion 331 according to an embodiment of the present disclosure.

[0089] In some embodiments, the target body 1 is provided with an inlet A connected to N first sub-inlets 31; at least one first partition 33 includes a first end 331, which is close to the inlet A and is configured to cooperate with the first end 331 of the adjacent first partition 33 to define the first sub-inlet 31, or to cooperate with the first side wall 37 or the second side wall 38 to define the first sub-inlet 31; wherein the end of the first end 331 is beveled, and the beveled surface 3311 intersects with a plate surface 3312 of the first partition 33, and when viewed from a top view, the end of the first end 331 is roughly triangular.

[0090] In some embodiments, the inclination degrees of the end chamfered surfaces 3311 of the first end portions 331 of any two adjacent first partitions 33 are the same or different.

[0091] Referring to Figures 3 and 5, the top view is in the direction of the arrow in Figure 5. By setting different bevel angles, the size of the first sub-inlet 31 can be adjusted accordingly. The smaller the angle at the end, the greater the degree of inclination, which can reserve more space for fluid flow, thereby achieving the purpose of adjusting the flow rate and flow rate.

[0092] According to the embodiments of the present disclosure, the size of the first sub-inlet 31 is modified by providing a chamfered end of the first end portion 331. The angle of fluid entry is further flexibly adjusted by adjusting the inclination of the chamfered end portion 3311, thereby regulating the flow rate and velocity of each comb-tooth waterway and reducing water resistance. This avoids the problem of high flow in the outer waterway and reduced flow in the inner waterway, which reduces heat dissipation efficiency and causes localized excessive temperature rise. Furthermore, the water flow rate within the irradiation working area is uniform, eliminating low-velocity areas and preventing the formation of air locks.

[0093] In some embodiments, a first ramp 35 is provided at the bottom of at least one first sub-inlet 31 . The first ramp 35 is configured to gradually rise along the fluid flow direction until it is flush with the bottom of the first flow channel 32 connected to the upper first sub-inlet 31 .

[0094] In some embodiments, when a first ramp 35 is disposed below each of at least two first sub-entrances 31 , the slope of any one of the first ramps 35 may be the same as or different from the slope of at least one of the other first ramps 35 .

[0095] According to the embodiment of the present disclosure, an inclined ramp is set in the depth direction to increase the space for accommodating fluid, and the slope is adjusted according to the adaptability of each flow channel to regulate the flow and flow rate of each comb water channel, reduce water resistance, and avoid the formation of air plugs.

[0096] In some embodiments, the second heat dissipation slot 3 includes N first sub-outlets 34 (such as located at the second end of the first partition) corresponding one to one to the N first sub-inlets 31, and each sub-outlet is connected to a first flow channel 32; a second ramp 36 is provided at the bottom of at least one first sub-outlet 34, and the second ramp 36 is configured to gradually decrease along the flow direction of the fluid.

[0097] In some embodiments, when a second ramp 36 is respectively provided at the bottom of at least two first sub-outlets 34 , the slope of any one of the second ramps 36 is the same as or different from the slope of at least one of the other second ramps 36 .

[0098] According to an embodiment of the present disclosure, an inclined ramp is provided in the depth direction of the sub-outlet, thereby increasing the space for accommodating fluid, and the slope is adaptively adjusted according to each flow channel to reduce flow resistance and facilitate fluid outflow.

[0099] In some embodiments, the second heat dissipation groove 3 is roughly parallel to the first heat dissipation groove 4, and the fluid flows in opposite directions; a first arc-shaped corner 6 is provided at the connection point between the second heat dissipation groove 3 and the first heat dissipation groove 4, and the fluid in the second heat dissipation groove 3 enters the first heat dissipation groove 4 after being constrained by the first arc-shaped corner 6.

[0100] 3 , the distances between each first flow channel 32 and the fluid inlet of the first scattering slot are different. Providing the first arc-shaped corner 6 to constrain the fluid coming out of each first flow channel 32 may make the fluid flow rate in each area uniform after entering the first scattering slot.

[0101] In some embodiments, a third ramp 41 is provided at the bottom of the fluid inlet of the first heat dissipation slot 4. The third ramp 41 is configured to gradually rise along the direction of fluid flow. This third ramp 41 provides a buffer for the fluid and increases the depth of the fluid inlet. As shown in Figure 3 , the arrow marked "Ramp" on the right side points to the fluid inlet of the irradiation working area waterway.

[0102] In some embodiments, the third heat sink 5 is substantially parallel to the first heat sink 4 and has opposite fluid flow directions. The third heat sink 5 is substantially parallel to the second heat sink 3 and has the same fluid flow direction. The third heat sink 5 includes M second flow channels 51 and M second sub-inlets 52. Each second sub-inlet 52 is connected to a corresponding second flow channel 51, where M is an integer greater than or equal to 2. Each second sub-inlet 52 is different in size from at least one other second sub-inlet 52. The M second sub-inlets 52 are each configured to adjust the flow rate of the fluid flowing into the connected second flow channel 51, for example, to ensure that the flow rate of the fluid in each second flow channel 51 is substantially the same. The different sizes of the two second sub-inlets 52 include different fluid flow rates per unit time.

[0103] According to an embodiment of the present disclosure, by arranging M second flow channels 51 and M second sub-inlets 52 in the third heat dissipation slot 5, the flow rate of the fluid in each second flow channel 51 is made roughly the same, so that the fluid in the heat dissipation part can quickly carry heat out, avoid the formation of air plugs, and improve the heat dissipation capacity.

[0104] In some embodiments, the third heat dissipation slot 5 also includes M-1 second partitions 53, and any second partition 53 stands upright in the third heat dissipation slot 5; wherein, any two adjacent second partitions 53 cooperate with each other and / or the side walls of the third heat dissipation slot 5 cooperate with the adjacent second partitions 53 to define M second sub-inlets 52 and M second flow channels 51.

[0105] Exemplarily, the M second sub-inlets 52 include at least one of the following: a second sub-inlet 52 defined by the cooperation of any two adjacent second partitions 53; a second sub-inlet 52 defined by the cooperation of any second partition 53 and the third side wall 54 of the third heat dissipation slot 5, where the third side wall 54 is a partition between the third heat dissipation slot 5 and the first heat dissipation slot; a second sub-inlet 52 defined by the cooperation of any second partition 53 and the fourth side wall 55 of the third heat dissipation slot 5, where the third side wall 54 is opposite to the fourth side wall 55.

[0106] For example, a second baffle 53 is vertically disposed at the bottom of the third heat sink 5. The second baffle 53 may be made of copper. Referring to FIG3 , the M-1 second baffles 53 are provided, and together with the multiple second flow channels 51 within the third heat sink 5 , a comb-shaped water channel is formed. This increases the effective contact area between the fluid and the copper, expands the effective heat dissipation area, and improves heat dissipation efficiency.

[0107] FIG6 schematically shows a simple structural diagram of the second separator 53 according to an embodiment of the present disclosure.

[0108] In some embodiments, at least one second baffle 53 includes a third end 531, which faces the fluid outlet of the first heat dissipation slot 4 and is configured to cooperate with the third end 531 of the adjacent second baffle 53 to define a second sub-inlet 52, or is configured to cooperate with the adjacent third side wall or the third side wall to define the second sub-inlet 52; wherein, when viewed from a top view, the third end 531 is hook-shaped, and the end of the third end 531 is configured to extend in an arc from the fluid outlet of the first heat dissipation slot 4 to the third heat dissipation slot 5 to form a hook shape.

[0109] In some embodiments, the end of the third end portion 531 is beveled, and the beveled surface 5311 intersects with the arc surface 5312 of the third end portion 531 . When viewed from above, the end of the third end portion 531 is roughly triangular.

[0110] In some embodiments, the inclination degrees of the end chamfered surfaces 5311 of the third end portions 531 of any two adjacent second partitions 53 are the same or different.

[0111] Referring to Figure 6 , the top view is in the direction indicated by the arrow in Figure 6 . By setting different bevel angles, the size of the second sub-inlet 52 can be adjusted accordingly. The smaller the angle at the end, the greater the degree of inclination, which can reserve more space for fluid flow, thereby achieving the purpose of adjusting the flow rate and flow velocity.

[0112] In some embodiments, the arc lengths and / or arc angles of the third ends 531 of any two adjacent second separators 53 are different.

[0113] 6 , the arc length may be the length of the arc corresponding to the radian, and more specifically, the length from the end to the connection between the hook and the straight portion of the second partition 53 .

[0114] In some embodiments, a second arc-shaped corner 7 is provided at the connection point between the third heat dissipation slot 5 and the first heat dissipation slot 4 , and the fluid in the first heat dissipation slot 4 enters the third heat dissipation slot 5 after being constrained by the second arc-shaped corner 7 .

[0115] 3 , the distances between the irradiation working area water channel (i.e., the first heat dissipation slot 4) and the fluid inlet of the return water area comb-shaped water channel (i.e., the third heat dissipation slot 5) are different in each area along the vertical direction shown in the figure. Providing a second arc corner 7 to constrain the fluid coming out of the irradiation working area water channel may make the fluid flow rate of each flow channel uniform after entering the third scattering slot.

[0116] In some embodiments, the M second sub-entries 52 include at least one of the following:

[0117] The second arc-shaped corner 7 cooperates with the third end 531 of the adjacent second partition 53 to define a second sub-inlet 52. The second sub-inlet 52 is arc-shaped and its shape matches the second arc-shaped corner 7.

[0118] The second sub-inlet 52 is defined by the third ends 531 of any two adjacent second partitions 53. The second sub-inlet 52 is arc-shaped, and its shape matches the hook shape of the two third ends 531 forming it.

[0119] The third end portion 531 of the single second partition plate 53 cooperates with the third side wall 54 to define the second sub-inlet 52 . The third side wall 54 is a partition plate between the third heat dissipation slot 5 and the first heat dissipation slot 4 .

[0120] For any arc-shaped second sub-inlet 52, the inlet starts at the end of the third end 531, and ends at the contact portion between the third end 531 and the straight portion of the partition, such as the connection between the hook and the straight portion of the second partition 53 as shown in Figure 3.

[0121] In some embodiments, for any two second partitions 53 , the third ends 531 thereof are configured such that the closer they are to the second arc-shaped corner 7 , the greater the arc length.

[0122] Referring to Figure 3 , two second baffles 53 are shown. The second baffle 53 adjacent to the second curved corner 7 has a larger arc length, and the two baffles together define an inlet flow channel with a longer flow stroke. The second baffle 53 closer to the third sidewall 54 has a smaller arc length, and together with the other second baffle 53, defines an inlet flow channel with a smaller flow stroke. The second baffle 53 itself defines an inlet flow channel with a minimum flow stroke. This allows the flow velocity in different areas to be adapted and the flow velocity between the second flow channels 51 to be adjusted.

[0123] In some embodiments, a fourth ramp is provided below at least one second sub-inlet 52, gradually rising along the fluid flow direction until it is flush with the bottom of the second flow channel 51, thereby increasing the space for the second sub-inlet 52 and buffering the fluid. In some embodiments, when a fourth ramp is provided below at least two second sub-inlets 52, the slope of one of the fourth ramps is different from the slope of at least one other fourth ramp.

[0124] In some embodiments, the depth of the M second flow channels 51 extends toward the first surface, and the depth of any one second flow channel 51 differs from the depth of at least one other second flow channel 51. In some embodiments, the second flow channel 51 closest to the target portion 2 is configured to have the shallowest depth, perpendicular to the direction of fluid flow within the third heat sink 5. In other embodiments, the fluid outlet of at least one second flow channel in the lower third heat sink includes a fifth ramp that gradually descends along the direction of fluid flow, as shown near the fluid outlet of the comb-shaped water channel in the return water area on the right side of the label "Ramp" in Figure 3.

[0125] In some embodiments, the depth direction of the N first flow channels 32 extends toward the first surface, and the depth of any one first flow channel 32 is different from the depth of at least one other first flow channel 32. In some embodiments, in a direction perpendicular to the flow direction of the fluid in the second heat dissipation slot 3 and perpendicular to the flow channel depth, the first flow channel 32 closest to the target portion 2 is configured to have the shallowest depth.

[0126] The depth of each second flow channel 51 can be determined to suit the structure of the target 1, avoiding modifications to the target 1 structure. Channels of varying depths hold different volumes of fluid. Furthermore, more copper material can be reserved at the bottom of the shallowest flow channel, facilitating rapid heat transfer from the first surface of the target 2 to the heat sink.

[0127] According to some embodiments of the present disclosure, referring to Figures 2 to 6, the second partition plate 53, the third side wall 54 and the bottom of the heat dissipation groove respectively increase the heat dissipation area by contacting with the fluid; at the same time, since the fluid in the second heat dissipation groove 3 and the third heat dissipation groove 5 is diverted to multiple flow channels, the flow rate of the fluid is increased, thereby improving the heat dissipation effect.

[0128] According to some embodiments of the present disclosure, the top surface of the target body outer portion and the top surface of the heat dissipation portion are located in the same plane. The X-ray conversion target may further include a cover plate 8, which is arranged on the top surface of the target body outer portion 6 and the top surface of the heat dissipation portion. When the cover plate 8 covers the top surface of the target body outer portion and the top surface of the heat dissipation portion, it can secure and seal the target. The cover plate 8 may be a stainless steel plate.

[0129] According to some embodiments of the present disclosure, referring to Figures 2 to 7, the heat dissipation fluid directly contacts the second surface of the target portion 2. The large amount of heat generated on the first surface of the target portion 2 due to the bombardment of the high-energy electron beam is transferred to the fluid in the heat dissipation portion, thereby avoiding a rapid increase in the temperature of the target portion 2. The microstructures such as the first sub-inlet 31, the first flow channel 32, the various ramps, and the second sub-inlet 52 are provided to adjust the flow rate and flow velocity of each comb-tooth water channel and reduce the water resistance. This avoids the problem of excessive local temperature rise caused by reduced heat dissipation efficiency; at the same time, the water flow velocity in the irradiation working area can be made uniform, without low-speed water flow areas, thereby avoiding the formation of air plugs.

[0130] In some embodiments, an ultra-thin copper foam spraying (or sintering) process can be used in the heat dissipation part to form a microporous structure, further increasing the effective heat dissipation area; at the same time, the ability of copper foam to flow, boil and transfer heat is utilized to further improve the heat dissipation performance of the water channel, remove the heat from the target area to the greatest extent, and reduce local heat concentration.

[0131] In some embodiments, the inlet A and the return port B are arranged diagonally, and the distance between the top of the inlet A and the first surface is smaller than the distance between the top of the outlet and the first surface, so that the heat dissipation portion as a whole is in a series low-in and high-out mode. A plurality of comb-tooth flow channels are provided in each of the water inlet area (i.e., the second heat dissipation slot 3) and the return water area (i.e., the third heat dissipation slot 5), and the two are mirror-symmetrical structures. Taking the water inlet area as an example, two water channels of 3mm×11mm are designed on the outside relative to the water channel of the irradiation working area (i.e., the first heat dissipation slot 4), and one water channel of 3×5mm is designed on the inside. The tops of the three water channels are interconnected, so that the water flow can better infiltrate each water channel.

[0132] FIG7 schematically shows a flow velocity simulation diagram of the heat dissipation fluid in the ray conversion target 100 according to an embodiment of the present disclosure.

[0133] Referring to Figure 7, the heat dissipation section is designed as a series, low-inlet, high-outlet configuration. Multiple comb-shaped water channels are located in both the inlet and return water zones. Due to design requirements, the central irradiation working zone water channel is configured as a single channel to avoid blocking radiation. The comb-shaped structure regulates water flow distribution in the inlet zone. Combined with the circular angle at the end of the inlet zone, this ensures uniform water flow within the irradiation working zone, eliminating low-flow zones. The arc-shaped comb-shaped structure at the return water zone entrance effectively reduces flow resistance and regulates the flow rate within each channel, ensuring the most uniform water flow possible within the channel.

[0134] As shown in Figure 3, the water inlet area and the return water area are designed as comb-tooth waterways, and microstructures such as water flow entry angles, ramps, and special-shaped water diversion outlets are set to adjust the water entry angle and the flow resistance of each waterway to achieve the purpose of water flow distribution.

[0135] According to some embodiments of the present disclosure, the designed electron-ray conversion target 100 has a smaller flow resistance in the heat dissipation structure flow channel, and the inlet and outlet water flow rates are significantly increased compared to the parallel structure of the prior art, and the overall flow rate in each flow channel is more uniform. The series flow channel design reduces the difficulty of flow path design, and suppresses the possibility of further deterioration of the heat dissipation environment by forcibly carrying out the bubbles generated instantly when the beam is released through high-speed flow. By adding a comb-tooth heat dissipation structure and treating the inner surface of the flow channel, boiling heat transfer is introduced, and at the same time, the surface area of ​​the fluid in contact with the target body 1 for heat dissipation is increased, so that heat is removed more quickly and efficiently. In actual use, the service life of the target is extended and maintenance costs are reduced.

[0136] In some embodiments, a radiation source comprising the radiation conversion target according to any one of the above embodiments is provided. In some embodiments, an irradiation device comprising the radiation source is provided.

[0137] In some embodiments, the irradiation device provided by the present disclosure can be used for mineral composition analysis. In other embodiments, the irradiation device provided by the present disclosure can be used as a security inspection device in the field. For example, the objects to be inspected include vehicles, luggage, etc.

[0138] Those skilled in the art will appreciate that the features described in the various embodiments and / or claims of this disclosure may be combined and / or coupled in various ways, even if such combinations and / or couplings are not explicitly described in this disclosure. In particular, the features described in the various embodiments and / or claims of this disclosure may be combined and / or coupled in various ways without departing from the spirit and teachings of this disclosure. All such combinations and / or couplings are intended to fall within the scope of this disclosure.

[0139] The above embodiments are for illustrative purposes only and are not intended to limit the scope of the present disclosure. Although each embodiment has been described separately above, this does not mean that the measures in each embodiment cannot be used in combination to advantage. The scope of the present disclosure is defined by the appended claims and their equivalents. Without departing from the scope of the present disclosure, those skilled in the art may make various substitutions and modifications, all of which should fall within the scope of the present disclosure.

Claims

1. A radiation conversion target, comprising: Target body; A target portion is disposed inside the target body, the target portion having a first surface and a second surface opposite to each other, the first surface being configured to generate radiation; a heat dissipation portion configured to contain a heat dissipation fluid and at least partially located on the second surface of the target portion, wherein a fluid inlet of the heat dissipation portion is divided into N first sub-inlets, each of the first sub-inlets is connected to a corresponding first flow channel, and N is an integer greater than or equal to 2; Each of the first sub-inlets has a different size from at least one of the other first sub-inlets, and the N first sub-inlets are configured to adjust the flow rate of the fluid flowing into each first flow channel.

2. The radiation conversion target according to claim 1, wherein: The heat dissipation unit comprises: A first heat dissipation slot, located on the second surface of the target portion; A second heat dissipation slot, located at one side of the first heat dissipation slot, comprising N first sub-inlets and N first flow channels; a third heat dissipation slot, opposite to the second heat dissipation slot and located on the other side of the first heat dissipation slot; The first heat dissipation slot, the second heat dissipation slot and the third heat dissipation slot are connected in a circuitous manner, and the fluid passes through the second heat dissipation slot, the first heat dissipation slot and the third heat dissipation slot in sequence to absorb the heat of the target body.

3. The radiation conversion target according to claim 2, wherein: The second heat sink also includes: N-1 first baffles, any of which is erected in the second heat dissipation slot; The N first sub-entries include at least one of the following: A first sub-inlet defined by cooperation between any two adjacent first partitions; A first sub-inlet defined by cooperation between any one of the first baffles and the first side wall of the second heat dissipation slot; Any one of the first partitions cooperates with the second side wall of the second heat dissipation slot to define a first sub-inlet, the second side wall is a partition between the second heat dissipation slot and the first heat dissipation slot, and the first side wall is opposite to the second side wall.

4. The radiation conversion target according to claim 3, wherein: At least one of the first separators comprises: A first end portion configured to cooperate with a first end portion of an adjacent first partition plate to define the first sub-inlet, or configured to cooperate with the first side wall or the second side wall to define the first sub-inlet; The end of the first end portion is beveled, and the beveled surface intersects with a plate surface of the first partition plate. When viewed from a top view, the end of the first end portion is roughly triangular.

5. The radiation conversion target according to claim 3 or 4, wherein: A first ramp is provided at the bottom of at least one of the first sub-entrances, The first ramp is configured to gradually rise along the fluid flow direction until it is flush with the bottom of the first flow channel connected to the upper first sub-inlet.

6. The radiation conversion target according to claim 5, wherein: When the first ramp is disposed below at least two of the first sub-entrances, respectively, The slope of any one of the first ramps is the same as or different from the slope of at least one of the other first ramps.

7. The radiation conversion target according to claim 2, wherein: The second heat dissipation slot includes N first sub-outlets corresponding to the N first sub-inlets one by one, and each of the sub-outlets is connected to a first flow channel; A second ramp is provided at the bottom of at least one of the first sub-outlets, and the second ramp is configured to gradually decrease along the flow direction of the fluid.

8. The radiation conversion target according to claim 2, wherein: A first arc-shaped corner is provided at the connection point between the second heat dissipation slot and the first heat dissipation slot, and the fluid in the second heat dissipation slot enters the first heat dissipation slot after being constrained by the first arc-shaped corner.

9. The radiation conversion target according to claim 8, wherein: A third ramp is provided at the bottom of the fluid inlet of the first heat dissipation slot, and the third ramp is configured to gradually rise along the fluid flow direction.

10. The radiation conversion target according to claim 2, wherein: The third heat sink comprises: M second flow channels; M second sub-inlets, each of which is connected to a corresponding second flow channel, and M is an integer greater than or equal to 2; Wherein, each of the second sub-inlets has a different size from at least one of the other second sub-inlets, and the M second sub-inlets are respectively configured to adjust the flow rate of the fluid flowing to the connected second flow channel.

11. The radiation conversion target according to claim 10, wherein: The third heat sink also includes: M-1 second baffles, any of which is erected in the third heat dissipation slot; The M second sub-entries include at least one of the following: A second sub-inlet defined by cooperation between any two adjacent second partitions; A second sub-inlet defined by cooperation between any one of the second partitions and the third side wall of the third heat dissipation slot, wherein the third side wall is a partition between the third heat dissipation slot and the first heat dissipation slot; Any one of the second partitions cooperates with the fourth side wall of the third heat dissipation slot to define a second sub-inlet, and the third side wall is opposite to the fourth side wall.

12. The radiation conversion target according to claim 11, wherein: The at least one second separator comprises: The third end portion is directed toward the fluid outlet of the first heat dissipation slot and is configured to cooperate with the third end portion of the adjacent second partition plate to define the second sub-inlet, or is configured to cooperate with the adjacent third side wall or the fourth side wall to define the second sub-inlet; Wherein, when viewed from a top view, the third end portion is hook-shaped, and the end of the third end portion is configured to extend in an arc shape from the fluid outlet of the first heat dissipation groove into the third heat dissipation groove to form the hook shape.

13. The radiation conversion target according to claim 12, wherein: The end of the third end portion is beveled, and the beveled surface intersects with the arc surface of the third end portion. When viewed from a top view, the end of the third end portion is roughly triangular.

14. The radiation conversion target according to claim 12, wherein: The M second sub-entries include at least one of the following: A second sub-inlet is defined by the cooperation between the second arc corner and the third end of the adjacent second partition plate, wherein the second arc corner is arranged on the fourth side wall and is located at the connection between the third heat dissipation slot and the first heat dissipation slot; A second sub-inlet is defined by the third ends of any two adjacent second baffles, wherein for any two second baffles, the third ends of each are configured to have a greater arc length the closer they are to the second arc-shaped corner; The third end of the single second partition plate cooperates with the third side wall to define a second sub-inlet.

15. The radiation conversion target according to claim 2, wherein: The second heat dissipation slot is substantially parallel to the first heat dissipation slot, and the fluid flows in opposite directions, and the third heat dissipation slot is substantially parallel to the first heat dissipation slot, and the fluid flows in opposite directions.

16. A radiation source, comprising the radiation conversion target according to any one of claims 1 to 14.

17. An irradiation device, comprising the radiation source according to claim 15.

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