X-ray source cooling structure

Abstract

The present invention belongs to the technical field of X-ray sources, and discloses an X-ray source cooling structure, including a ray tube, a voltage doubling module, a sealing cylinder, an external cold row, a filter and a circulating pump. An oil outlet pipeline connected to a sealed space extends outward from the sealing cylinder, and the oil outlet pipeline is connected to the external cold row and the filter in sequence and then connected to the oil inlet of the circulating pump. The oil outlet of the circulating pump is connected to the oil return pipeline, and the oil return pipeline is connected to the sealing cylinder or the voltage doubling module, so that the insulating oil flowing out of the sealed space eventually flows back to the sealed space. The X-ray source cooling structure realizes the circulation of insulating oil, reduces the temperature of insulating oil in the entire sealed space, and effectively cools the anode of the ray tube, thereby improving the reliability of the X-ray source and extending its service life.

Description

Technical Field

[0001] The present invention relates to the technical field of X-ray sources, and in particular to an X-ray source cooling structure. Background Art

[0002] The existing X-ray sources on the market all use a tube structure that is filled with insulating oil in a sealed space and wrapped around the X-ray tube to achieve insulation and heat dissipation protection. When the X-ray tube generates X-rays, the energy conversion method is mainly manifested as heat changes. Most of the energy of high-speed electrons is converted into heat, and the heat is transferred to the insulating oil along the anode.

[0003] Traditional X-ray sources only use DC fans to blow air at the oil seal position to achieve the heat dissipation effect. However, due to the thickness, material and heat dissipation area of ​​the sealing wall, the heat dissipation capacity of this direct air-cooling method is very limited and cannot cope with long-term continuous working conditions. In addition, the oil seal of the X-ray source is a relatively closed structure. The insulating oil inside is static and does not flow. There is little heat exchange with the outside world, resulting in uneven spatial temperature distribution with excessively high insulating oil temperatures in some locations and relatively low temperatures in some locations. The anode, which needs heat dissipation the most, does not get sufficient heat dissipation. When the temperature of the insulating oil rises to near the flash point, conductive substances will evaporate, which significantly reduce the insulation performance of the insulating oil. At the same time, the insulation performance of the insulating oil will also decrease with the accumulation of X-ray irradiation measurements. The high temperature also makes the tail end of the anode immersed in the insulating oil more prone to oxidation and blackening, and produces impurities, thereby affecting the performance and service life of the X-ray source. Summary of the invention

[0004] Based on the above problems, an object of the present invention is to provide an X-ray source cooling structure to ensure the X-ray source works reliably and prolong its service life.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] An X-ray source cooling structure includes a ray tube, a voltage multiplier module and a sealing cylinder. The ray tube is provided with an anode electrically connected to the voltage multiplier module. The sealing cylinder is sleeved outside the anode, and the two ends of the sealing cylinder are respectively fixedly connected to the ray tube and the voltage multiplier module, thereby forming a sealed space outside the anode. The sealed space is filled with insulating oil. The X-ray source cooling structure also includes an external cold row, a filter and a circulating pump. An oil outlet pipeline connected to the sealed space extends outward from the sealing cylinder. The oil outlet pipeline is connected to the external cold row and the filter in sequence and then to the oil inlet of the circulating pump. The oil outlet of the circulating pump is connected to the oil return pipeline. The oil return pipeline is connected to the sealing cylinder or the voltage multiplier module, so that the insulating oil flowing out of the sealed space eventually flows back to the sealed space.

[0007] As an optional solution, the return oil pipe is connected to the sealing cylinder, the sealing cylinder is cylindrical, the oil outlet pipe and the return oil pipe extend out along the tangent direction of the cylinder wall of the sealing cylinder respectively, and the oil outlet pipe is connected to the upper half of the sealing cylinder, and the oil return pipe is connected to the lower half of the sealing cylinder, so that the insulating oil entering from the return oil pipe flows to the oil outlet pipe in a spiral upward manner.

[0008] As an optional solution, the voltage doubling module includes an epoxy resin block, in which a high-voltage circuit board and a feedback circuit board are encapsulated. The anode is directly electrically connected to the high-voltage circuit board and the feedback circuit board. The high-voltage circuit board is used to provide high voltage electricity to the anode, and the feedback circuit board is used to ensure the output quality and stability of the high-voltage electricity.

[0009] As an optional solution, the oil return pipe is connected to the voltage doubler module, a hollow section is provided at one end of the anode away from the tube shell of the ray tube, a plurality of through holes are provided on the side wall of the hollow section, a hollow copper column electrically contacting the anode is pre-buried in the voltage doubler module, the inner cavity of the hollow copper column is connected to the inner cavity of the hollow section and to the oil return pipe.

[0010] As an optional solution, the voltage doubling module includes an epoxy resin block, in which a high-voltage circuit board and a feedback circuit board are encapsulated. The anode is electrically connected to the high-voltage circuit board and the feedback circuit board through a hollow copper column. Side holes are opened on the side walls of the hollow copper column. An internal channel connecting the return oil pipeline and the side hole is provided in the epoxy resin block.

[0011] As an optional solution, the surface of the anode is encapsulated with a glass shell, one end of the glass shell is transitionally connected to the tube shell of the ray tube through a first sealing var, and the other end of the glass shell is transitionally connected to the anode through a second sealing var.

[0012] As an optional solution, an annular boss is provided on the surface of the epoxy resin block, and the annular boss extends between the sealing cylinder and the second sealing kovar to improve the insulation between the sealing cylinder and the second sealing kovar.

[0013] As an optional solution, the oil outlet pipe and the oil return pipe are both made of transparent PU material, and the outer shell of the filter is transparent or a visible window is provided on the outer shell.

[0014] As an optional solution, the surface of the external radiator is provided with cooling fins and a fan for blowing cold air to the cooling fins to reduce the temperature of the insulating oil entering the external radiator. The outer surface of the external radiator is provided with a temperature sensor, which is used to detect the surface temperature of the external radiator and thus reflect the temperature of the internal insulating oil.

[0015] As an optional solution, a partition is provided on the voltage multiplier module, and the external radiator and circulating pump are fixed on the side of the partition away from the X-ray tube. The partition is made of lead material or has lead glued on the surface to isolate the radiation of the X-ray tube.

[0016] Beneficial effects of the present invention: the X-ray source cooling structure realizes the circulation flow of insulating oil through a circulating pump, and the insulating oil is drawn out from the sealed space and then flows back to the sealed space after being dissipated by an external cooling row, thereby reducing the temperature of the insulating oil in the entire sealed space and effectively cooling the anode of the X-ray tube, thereby improving the reliability of the X-ray source and extending its service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the X-ray source cooling structure provided in Example 1 of the present invention.

[0018] Figure 2 It is a cross-sectional view of the X-ray source cooling structure provided in Example 1 of the present invention.

[0019] Figure 3 It is a front view of the X-ray source cooling structure provided in Example 1 of the present invention.

[0020] Figure 4 It is a schematic diagram of the X-ray source cooling structure provided in Example 2 of the present invention.

[0021] Figure 5 It is a cross-sectional view of the X-ray source cooling structure provided in Example 2 of the present invention.

[0022] Figure 6 It is a front view of the X-ray source cooling structure provided in Example 2 of the present invention.

[0023] Figure 7 This is a simulation diagram of the fluid temperature distribution of the structure that is not connected to the oil circulation system.

[0024] Figure 8 This is a simulation diagram of the temperature distribution of the fluid at the anode end of the X-ray tube of the X-ray source cooling structure provided in Example 2 of the present invention.

[0025] In the attached figure:

[0026] 1. X-ray tube; 11. anode; 111. hollow section; 112. through hole; 12. glass shell; 13. first sealing clasp; 14. second sealing clasp;

[0027] 2. voltage doubling module; 21. epoxy resin block; 211. annular boss; 212. internal channel; 22. high voltage circuit board; 23. feedback circuit board; 24. hollow copper column; 241. side hole;

[0028] 3. Sealing cylinder; 31. Sealing space;

[0029] 4. External radiator; 41. Fan;

[0030] 5. Filter;

[0031] 6. Circulation pump;

[0032] 7. Oil outlet pipeline;

[0033] 8. Oil return pipeline;

[0034] 9. Partition. DETAILED DESCRIPTION

[0035] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0036] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0038] In the description of this embodiment, the terms "upper", "lower", "left", "right" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0039] Embodiment 1:

[0040] See also Figures 1 to 3As shown, this embodiment provides an X-ray source cooling structure, including a ray tube 1, a voltage multiplier module 2 and a sealing tube 3. The ray tube 1 is provided with an anode 11 electrically connected to the voltage multiplier module 2. The sealing tube 3 is sleeved outside the anode 11, and the two ends of the sealing tube 3 are respectively fixed to the ray tube 1 and the voltage multiplier module 2, so as to form a sealed space 31 outside the anode 11, and the sealed space 31 is filled with insulating oil. The insulating oil protects the ray tube 1, and when the ray tube 1 is powered on, the anode 11 will heat up, and the temperature of the insulating oil in the sealed space 31 will also rise accordingly.

[0041] In this regard, the X-ray source cooling structure also includes an external radiator 4, a filter 5 and a circulating pump 6. An oil outlet pipe 7 connected to the sealed space 31 extends outward from the sealing cylinder 3. The oil outlet pipe 7 is connected to the external radiator 4 and the filter 5 in sequence and then to the oil inlet of the circulating pump 6. The oil outlet of the circulating pump 6 is connected to the oil return pipe 8, and the oil return pipe 8 is connected to the sealing cylinder 3, so that the insulating oil flowing out of the sealed space 31 eventually flows back to the sealed space 31.

[0042] Driven by the circulation pump 6, the high-temperature insulating oil in the sealing cylinder 3 enters the external cooling row 4 through the oil outlet pipe 7 for cooling, then flows out from the external cooling row 4 and passes through the filter 5 to remove large particles of impurities before entering the circulation pump 6, and then flows back into the sealing cylinder 3 through the return oil pipe 8, thus realizing the circulation of the insulating oil. Figure 1 The dotted line in the middle indicates the flow direction of the insulating oil.

[0043] Therefore, the X-ray source cooling structure realizes the circulation flow of the insulating oil through the circulating pump 6, and after the insulating oil is drawn out from the sealed space 31, it is dissipated by the external cold row 4 and then flows back to the sealed space 31, thereby reducing the overall temperature of the insulating oil, and then effectively cooling the anode 11, thereby improving the reliability of the X-ray source and extending its service life.

[0044] Optionally, the sealing cylinder 3 is cylindrical, and the oil outlet pipe 7 and the oil return pipe 8 extend out along the tangent direction of the cylinder wall of the sealing cylinder 3 respectively, and the oil outlet pipe 7 is connected to the upper half of the sealing cylinder 3, and the oil return pipe 8 is connected to the lower half of the sealing cylinder 3, so that the insulating oil entering from the oil return pipe 8 flows to the oil outlet pipe 7 in a spiral upward manner.

[0045] Since the oil outlet pipe 7 and the oil return pipe 8 are arranged along the tangent direction of the sealing cylinder 3, that is, the initial velocity of the insulating oil pumped into the sealing cylinder 3 is tangent to the cylinder wall, the insulating oil driven by the circulation pump 6 will flow circumferentially along the cylinder wall. In addition, the interface position of the oil outlet pipe 7 is higher than the interface position of the oil return pipe 8, and the insulating oil extracted at a high place will be gradually replenished by the insulating oil pumped in from a low place. Therefore, the insulating oil returning into the sealing cylinder 3 will flow axially from low to high and circumferentially along the sealing cylinder 3, that is, it flows in a spiral upward route. Heat exchange is performed in this cycle, which can reduce the temperature of the insulating oil in the entire sealed space 31 and improve the heat dissipation effect on the anode 11.

[0046] Optionally, the voltage doubling module 2 includes an epoxy resin block 21, in which a high-voltage circuit board 22 and a feedback circuit board 23 are encapsulated. The anode 11 is directly electrically connected to the high-voltage circuit board 22 and the feedback circuit board 23 through wires. The high-voltage circuit board 22 is used to provide high voltage electricity to the anode 11, and the feedback circuit board 23 is used to ensure the output quality and stability of the high-voltage electricity.

[0047] Specifically, one end of the sealing tube 3 is fixed to the ray tube 1 via a flange, and the other end of the sealing tube 3 is glued and connected to the epoxy resin block 21 .

[0048] Furthermore, a glass shell 12 is encapsulated on the surface of the anode 11 , one end of the glass shell 12 is transitionally connected to the tube shell of the ray tube 1 through a first sealing var 13 , and the other end of the glass shell 12 is transitionally connected to the anode 11 through a second sealing var 14 .

[0049] Among them, the first end of the first sealing kovar 13 is welded and fixed to the tube shell of the ray tube 1, the first end of the second sealing kovar 14 is welded and fixed to the end of the anode 11, the second end of the first sealing kovar 13 is sintered and fixed to the glass shell 12, and the second end of the second sealing kovar 14 is sintered and fixed to the glass shell 12. The glass shell 12 at the part connected to the first sealing kovar 13 or the second sealing kovar 14 transitions from thick to thin. The glass material at the thinnest part is easily damaged by high voltage, so particularly good insulation is required to achieve protection to avoid affecting the sealing of the ray tube 1.

[0050] Furthermore, the tube shell of the ray tube 1 is made of stainless steel, such as Figure 2 As shown, the first sealing kovar 13 is in direct metal contact with the tube shell and the sealing tube 3 of the ray tube 1, and is at the same potential when powered on. The glass at this position is not easily damaged by high voltage breakdown. However, the second sealing kovar 14 and the sealing tube 3 are not at the same potential (glass is an insulator), and the glass at the joint at this position needs insulation protection.

[0051] In this regard, an annular boss 211 is provided on the surface of the epoxy resin block 21, and the annular boss 211 extends between the sealing tube 3 and the second sealing valve 14 to improve the insulation between the sealing tube 3 and the second sealing valve 14. Since the insulation coefficient of solid epoxy resin is higher than that of insulating oil, the glass part on the second sealing valve 14 can be effectively protected from being damaged by high voltage.

[0052] Optionally, the oil outlet pipe 7 and the oil return pipe 8 are both made of transparent PU material, and the outer shell of the filter 5 is transparent or a visual window is provided on the outer shell to facilitate observation of the state of the insulating oil and the internal filter element of the filter 5. When the oil quality is observed to be deteriorating, the insulating oil can be replaced in advance to avoid affecting the normal operation of the X-ray source.

[0053] Optionally, the surface of the external cooling radiator 4 is provided with heat dissipation fins and a fan 41 for blowing cold air to the heat dissipation fins, so as to reduce the temperature of the insulating oil entering the external cooling radiator 4 .

[0054] Furthermore, the external radiator 4 is made of copper, which is thin and has good thermal conductivity. A temperature sensor is provided on the outer surface of the external radiator 4. The temperature sensor is used to detect the surface temperature of the external radiator 4 and then reflect the temperature of the internal insulating oil. The data of the temperature sensor can be used to feedback and adjust the power of the circulating pump 6 and the speed of the fan 41, so that the insulating oil inside the X-ray tube 1 is maintained at an ideal working temperature.

[0055] Optionally, a partition 9 is provided on the voltage doubling module 2 , and the partition 9 is used to fix and isolate the external cold row 4 and the circulating pump 6 . The partition 9 is made of lead material or has lead adhered on the surface to isolate the radiation of the ray tube 1 .

[0056] Since X-ray irradiation may damage the rotors of the fan 41 and the circulating pump 6, and lead is a metal material commonly used in industry to protect against high-energy radiation, it can effectively isolate the radiation of X-rays. The partition 9 is made of sheet metal, and the thickness of the lead material or the thickness of the lead sheet adhered to the surface needs to be calculated and selected based on parameters such as the radiation energy of the X-ray tube 1 and the absorption rate of lead, so as to avoid the influence of radiation and extend the service life of the fan 41 and the circulating pump 6.

[0057] Embodiment 2:

[0058] See also Figures 4 to 6 As shown, this embodiment provides another X-ray source cooling structure, including a ray tube 1, a voltage multiplier module 2 and a sealing tube 3. The ray tube 1 is provided with an anode 11 electrically connected to the voltage multiplier module 2. The sealing tube 3 is sleeved outside the anode 11, and the two ends of the sealing tube 3 are respectively fixed to the ray tube 1 and the voltage multiplier module 2, so as to form a sealed space 31 outside the anode 11, and the sealed space 31 is filled with insulating oil. The insulating oil protects the ray tube 1, and when the ray tube 1 is powered on, the anode 11 will heat up, and the temperature of the insulating oil in the sealed space 31 will also rise accordingly.

[0059] In this regard, the X-ray source cooling structure also includes an external radiator 4, a filter 5 and a circulating pump 6. An oil outlet pipe 7 connected to the sealed space 31 extends outward from the sealing cylinder 3. The oil outlet pipe 7 is connected to the external radiator 4 and the filter 5 in sequence and then to the oil inlet of the circulating pump 6. The oil outlet of the circulating pump 6 is connected to the return oil pipe 8. The difference from Example 1 is that the return oil pipe 8 is connected to the pressure doubling module 2 and finally connected to the sealed space 31.

[0060] Among them, a hollow section 111 is provided at one end of the tube shell of the anode 11 away from the ray tube 1, and a plurality of through holes 112 are opened on the side wall of the hollow section 111. A hollow copper column 24 electrically contacting the anode 11 is pre-buried in the voltage multiplier module 2, and the inner cavity of the hollow copper column 24 is connected to the inner cavity of the hollow section 111 and to the oil return pipe 8.

[0061] Driven by the circulation pump 6, the high-temperature insulating oil in the sealed space 31 of the sealing cylinder 3 enters the external cooling row 4 through the oil outlet pipe 7 for cooling, and then flows out from the external cooling row 4 and passes through the filter 5 to remove large particles of impurities and enter the circulation pump 6, and then enters the hollow copper column 24 of the voltage doubler module 2 through the return oil pipe 8 to reach the hollow section 111 of the anode 11, directly cooling the anode 11, and finally flows back to the sealed space 31 through the through hole 112 on the hollow section 111, realizing the circulation of the insulating oil. Figure 4 and Figure 5 The dotted line in the middle indicates the flow direction of the insulating oil.

[0062] Thus, the circulation flow of the insulating oil is realized through the circulation pump 6, and after the insulating oil is drawn out from the sealed space 31, it is dissipated through the external cooling row 4, then flows to the hollow section 111 of the anode 11, and finally flows back to the sealed space 31, thereby effectively cooling the anode 11 and reducing the temperature of the insulating oil in the entire sealed space 31, thereby improving the reliability of the X-ray source and extending its service life.

[0063] Optionally, the voltage doubling module 2 includes an epoxy resin block 21, in which a high-voltage circuit board 22 and a feedback circuit board 23 are encapsulated. The anode 11 is in electrical contact with a hollow copper column 24. The hollow copper column 24 is electrically connected to the high-voltage circuit board 22 and the feedback circuit board 23 through a wire. The high-voltage circuit board 22 is used to provide high voltage electricity to the anode 11, and the feedback circuit board 23 is used to ensure the output quality and stability of the high voltage electricity.

[0064] Specifically, one end of the sealing tube 3 is fixed to the ray tube 1 via a flange, and the other end of the sealing tube 3 is glued and connected to the epoxy resin block 21 .

[0065] Furthermore, a glass shell 12 is encapsulated on the surface of the anode 11, one end of the glass shell 12 is transitionally connected to the tube shell of the ray tube 1 through a first sealing kovar 13, and the other end of the glass shell 12 is transitionally connected to the anode 11 through a second sealing kovar 14, and the hollow section 111 is located outside the second sealing kovar 14.

[0066] The shell of the ray tube 1 is made of stainless steel. The first end of the first sealing Kovar 13 is welded and fixed to the shell of the ray tube 1, and the second end of the first sealing Kovar 13 is sintered and fixed to the glass shell 12. The anode 11 is made of copper. The first end of the second sealing Kovar 14 is welded and fixed to the anode 11, and the second end of the second sealing Kovar 14 is sintered and fixed to the glass shell 12. Since the thermal expansion coefficients of glass, copper and stainless steel are different, the stress caused by different expansion rates will cause cracks at the joint. The first sealing Kovar 13 and the second sealing Kovar 14 are both made of Kovar alloy. Kovar alloy is a nickel-based alloy. The expansion coefficient of glass in the temperature range of 20°C to 450°C is similar to that of glass, the Curie point is high, and it has good low-temperature structural stability. Therefore, Kovar alloy is selected as a transition piece between glass and copper and stainless steel. The glass of the joint part with Kovar alloy is transitioned from thick to thin. The glass at the end of the joint is relatively thin and easily damaged by high voltage. Therefore, it needs particularly good insulation to achieve protection to avoid affecting the sealing of the ray tube 1.

[0067] Furthermore, if Figure 5 As shown, the first sealing kovar 13 is in direct metal contact with the tube shell and the sealing tube 3 of the ray tube 1, and is at the same potential when powered on. The glass at this position is not easily damaged by high voltage breakdown. However, the second sealing kovar 14 and the sealing tube 3 are not at the same potential (glass is an insulator), and the glass at the joint at this position needs insulation protection.

[0068] In this regard, an annular boss 211 is provided on the surface of the epoxy resin block 21, and the annular boss 211 extends between the sealing tube 3 and the second sealing kovar 14 to improve the insulation between the sealing tube 3 and the second sealing kovar 14. Since the insulation coefficient of solid epoxy resin is higher than that of insulating oil, the glass part on the second sealing kovar 14 can be effectively protected from being damaged by high voltage.

[0069] It should be noted that the presence of the annular boss 211, while ensuring insulation, also leads to a "stifling tank" effect, that is, the structure of the annular boss 211 is like a bowl, and the lower end of the ray tube 1 is like a bowl cover, which locks a part of the insulating oil into the "bowl", leaving only a small gap, so that the insulating oil in the "bowl" has poor fluidity, and the exchange with the insulating oil outside the "bowl" is hindered, and the heat exchange is also hindered. In order to strengthen the circulation and heat exchange of the insulating oil, a circulating pump 6 and a circulating pipeline connected in series with it are used to circulate the insulating oil in the sealing cylinder 3, thereby avoiding the "stifling tank" effect.

[0070] After experimental analysis, the simulation results of fluid temperature distribution of the structure without circulation system are as follows: Figure 7 As shown, the fluid temperature distribution simulation diagram of the structure connected to the circulation system of this embodiment is as follows Figure 8 As shown, it can be seen that in the structure of this embodiment, the temperature of the insulating oil is reduced by 60° C. to 70° C. as a whole, and the cooling effect at the end of the anode 11 is obvious.

[0071] Optionally, a side hole 241 is opened on the side wall of the hollow copper column 24, and an internal channel 212 connecting the return oil pipe 8 and the side hole 241 is provided in the epoxy resin block 21. The epoxy resin block 21 is integrally formed by a solid-state potting process, and the internal channel 212 is formed by demolding the round rod or polytetrafluoroethylene hose in the potting mold after curing.

[0072] Specifically, the solid-state potting process is to fully mix the liquid epoxy resin A material and B material and inject them into the potting mold where the circuit board and other internal parts are placed, and then give them appropriate temperature and pressure to solidify them, and then remove the potting mold. Among them, the internal channel 212 is also formed during the solid-state potting process, that is, when assembling the mold, a round rod with a small draft angle (about 1°) extending from the outside to the hollow copper column 24 is installed to facilitate the demolding of the round rod and other mold parts after curing. The design length of the internal channel 212 needs to be calculated based on the insulation distance of the insulation coefficient of the insulating oil and the voltage of the X-ray source. If the insulation distance of the straight internal channel 212 is not enough, it is necessary to design this internal channel 212 into a curved path to increase the total length of the oil path, thereby increasing the insulation distance. At this time, the molding of the internal channel 212 is achieved by using a pre-formed S-shaped curved polytetrafluoroethylene hose instead of a round rod. A release agent is sprayed on the outside of the polytetrafluoroethylene hose. During demolding, a high-pressure air gun is used to blow air at the fitting surface of the polytetrafluoroethylene hose and the cured epoxy resin block 21 to separate and loosen them so that the polytetrafluoroethylene hose can be pulled out.

[0073] Similarly, the oil outlet pipe 7 and the oil return pipe 8 are both made of transparent PU material, and the outer shell of the filter 5 is transparent or a visual window is provided on the outer shell to facilitate observation of the state of the insulating oil and the internal filter element of the filter 5. When the oil quality is observed to be deteriorating, the insulating oil can be replaced in advance to avoid affecting the normal operation of the X-ray source.

[0074] Optionally, the surface of the external cooling radiator 4 is provided with heat dissipation fins and a fan 41 for blowing cold air to the heat dissipation fins, so as to reduce the temperature of the insulating oil entering the external cooling radiator 4 .

[0075] Furthermore, the external radiator 4 is made of copper, which is thin and has good thermal conductivity. A temperature sensor is provided on the outer surface of the external radiator 4. The temperature sensor is used to detect the surface temperature of the external radiator 4 and then reflect the temperature of the internal insulating oil. The data of the temperature sensor can be used to feedback and adjust the power of the circulating pump 6 and the speed of the fan 41, so that the insulating oil inside the X-ray tube 1 is maintained at an ideal working temperature.

[0076] Optionally, a partition 9 is provided on the voltage doubling module 2 , and the partition 9 is used to fix and isolate the external cold row 4 and the circulating pump 6 . The partition 9 is made of lead material or has lead adhered on the surface to isolate the radiation of the ray tube 1 .

[0077] Since X-ray irradiation may damage the rotors of the fan 41 and the circulating pump 6, and lead is a metal material commonly used in industry to protect against high-energy radiation, it can effectively isolate the radiation of X-rays. The partition 9 is made of sheet metal, and the thickness of the lead material or the thickness of the lead sheet adhered to the surface needs to be calculated and selected based on parameters such as the radiation energy of the X-ray tube 1 and the absorption rate of lead, so as to avoid the influence of radiation and extend the service life of the fan 41 and the circulating pump 6.

[0078] In summary, both Example 1 and Example 2 achieve the circulation of the insulating oil by leading the insulating oil out for cooling and then returning it to the sealed space 31, thereby reducing the temperature of the insulating oil in the entire sealed space 31. Example 2 also returns the insulating oil to the anode 11 to cool the anode 11 in a targeted manner, thereby improving the reliability of the X-ray source and extending its service life.

[0079] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. An X-ray source cooling structure, comprising a ray tube (1), a voltage multiplier module (2) and a sealing tube (3), wherein the ray tube (1) is provided with an anode (11) electrically connected to the voltage multiplier module (2), the sealing tube (3) is sleeved outside the anode (11), and the two ends of the sealing tube (3) are respectively fixedly connected to the ray tube (1) and the voltage multiplier module (2), thereby forming a sealed space (31) outside the anode (11), and the sealed space (31) is filled with insulating oil, characterized in that: The X-ray source cooling structure further comprises an external cold row (4), a filter (5) and a circulation pump (6); an oil outlet pipeline (7) extending outward from the sealing cylinder (3) and communicating with the sealing space (31); the oil outlet pipeline (7) is connected to the external cold row (4) and the filter (5) in sequence and then to the oil inlet of the circulation pump (6); the oil outlet of the circulation pump (6) is connected to an oil return pipeline (8); the oil return pipeline (8) is connected to the sealing cylinder (3) or the pressure doubling module (2), so that the insulating oil flowing out of the sealing space (31) eventually flows back to the sealing space (31); The oil return pipe (8) is connected to the voltage multiplier module (2); a hollow section (111) is provided at one end of the anode (11) away from the tube shell of the ray tube (1); a plurality of through holes (112) are provided on the side wall of the hollow section (111); a hollow copper column (24) electrically contacting the anode (11) is pre-buried in the voltage multiplier module (2); the inner cavity of the hollow copper column (24) is in communication with the inner cavity of the hollow section (111) and is in communication with the oil return pipe (8); The voltage doubling module (2) comprises an epoxy resin block (21), wherein a high voltage circuit board (22) and a feedback circuit board (23) are encapsulated in the epoxy resin block (21), the anode (11) is electrically connected to the high voltage circuit board (22) and the feedback circuit board (23) via the hollow copper column (24), a side hole (241) is provided on the side wall of the hollow copper column (24), and an internal channel (212) is provided in the epoxy resin block (21) for connecting the oil return pipe (8) and the side hole (241).

2. The X-ray source cooling structure according to claim 1, characterized in that: The surface of the anode (11) is encapsulated with a glass shell (12); one end of the glass shell (12) is transitionally connected to the tube shell of the ray tube (1) via a first sealing kovar (13); and the other end of the glass shell (12) is transitionally connected to the anode (11) via a second sealing kovar (14).

3. The X-ray source cooling structure according to claim 2, characterized in that: An annular boss (211) is provided on the surface of the epoxy resin block (21), and the annular boss (211) extends between the sealing cylinder (3) and the second sealing kovar (14) to improve the insulation between the sealing cylinder (3) and the second sealing kovar (14).

4. The X-ray source cooling structure according to claim 1, characterized in that: The oil outlet pipeline (7) and the oil return pipeline (8) are both made of transparent PU material, and the outer shell of the filter (5) is transparent or a visible window is provided on the outer shell.

5. The X-ray source cooling structure according to claim 1, characterized in that: The surface of the external radiator (4) is provided with heat dissipation fins and a fan (41) for blowing cold air to the heat dissipation fins, so as to reduce the temperature of the insulating oil entering the external radiator (4). The outer surface of the external radiator (4) is provided with a temperature sensor, and the temperature sensor is used to detect the surface temperature of the external radiator (4) and thus reflect the temperature of the internal insulating oil.

6. The X-ray source cooling structure according to claim 1, characterized in that: A partition (9) is provided on the voltage multiplier module (2); the external cold row (4) and the circulating pump (6) are fixed on a side of the partition (9) away from the ray tube (1); the partition (9) is made of lead or has lead bonded on its surface to isolate the radiation of the ray tube (1).

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