Oil-immersed X-ray source device

Abstract

The utility model relates to the technical field of ray devices, in particular to an oil-immersed X-ray source device. Comprising an oil tank filled with insulating oil and an X-ray tube installed in the oil tank in a sealed mode and used for generating X-rays, a pressure relief hole is formed in the oil tank, and an elastic expansion cap which can make contact with the insulating oil and deform under the pressure effect to relieve pressure covers the pressure relief hole in a sealed mode. A sealing ring capable of being attached to the opening of the pressure relief hole is arranged on the elastic expansion cap. When the elastic expansion cap is installed on the oil tank, the pressing ring presses the sealing ring at the opening of the pressure relief hole, and at least part of the middle of the elastic expansion cap is sunken into the oil tank to form an elastic deformation cavity. When the oil-immersed X-ray source device works to generate heat to cause the volume expansion of the insulating oil, the elastic expansion cap can automatically deform outwards under the action of pressure, so that the internal space of the oil tank is enlarged, and the pressure is effectively reduced. The mechanism does not need external power and is quick in response, and the risk that the oil tank is damaged or leaks oil due to overlarge pressure is effectively avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of ray devices, in particular to an oil-immersed X-ray source device. Background Art

[0002] As a ray source device, the X-ray tube has been widely used in various types of machines. Such as in high-precision X-ray fluorescence analyzers, X-ray thickness gauges, X-ray film thickness gauges, X-ray non-destructive detectors and other equipment.

[0003] During the operation of the X-ray tube, it will generate relatively high heat and its heat dissipation performance is poor, which leads to unstable X-ray output intensity and affects the performance of the equipment. Therefore, in order to solve the problem of heat dissipation of the X-ray tube, a kind of X-ray tube is disclosed in Patent CN210668257U. The X-ray tube includes a tube core and an aluminum alloy shell treated by blackening. The aluminum alloy shell has a sealed inner cavity. The tube core is encapsulated in the sealed inner cavity of the aluminum alloy shell. There is a gap between the outer wall of the tube core and the inner wall of the aluminum alloy shell, and transformer oil is injected into this gap. This patent improves the heat dissipation ability of the X-ray tube through heat conduction of the transformer oil and aluminum, so as to keep it stably outputting X-rays.

[0004] Although the above-mentioned prior art can effectively improve the heat dissipation ability of the X-ray tube, it is found in the actual use process that since both the X-ray tube and the transformer oil are encapsulated in the aluminum alloy shell, this will cause the volume of the transformer oil to expand during the heating process, and then cause the pressure in the aluminum alloy shell to increase, resulting in the transformer oil may leak out from the sealing gap of the aluminum alloy shell, so that the sealing performance of the aluminum alloy shell is damaged. It can be seen that there is an urgent need for a device that can effectively reduce the internal pressure of the aluminum alloy shell to solve the leakage problem caused by too high internal pressure. Summary of the Utility Model

[0005] In order to avoid and overcome the technical problems existing in the prior art, the utility model provides an oil-immersed X-ray source device. The utility model can effectively improve the situation of excessive internal pressure in the fuel tank through an elastic expansion cap installed on the fuel tank for pressure relief, and then avoid the occurrence of leakage of the fuel tank.

[0006] To achieve the above object, the utility model provides the following technical solutions:

[0007] The oil-immersed X-ray source device includes an oil tank filled with insulating oil, and an X-ray tube sealed and installed in the oil tank for generating X-rays. A pressure relief hole is formed in the oil tank, and an elastic expansion cap that can contact the insulating oil and deform under pressure to relieve pressure is hermetically covered at the pressure relief hole. A sealing ring that can fit at the orifice of the pressure relief hole is provided on the elastic expansion cap. The device further includes a pressing ring, which is detachably connected to the oil tank to press the sealing ring against the orifice of the pressure relief hole to achieve the sealing of the pressure relief hole. When the elastic expansion cap is installed on the oil tank, at least a part of the middle of the elastic expansion cap is recessed into the oil tank to form an elastic deformation cavity.

[0008] As a further scheme of the present utility model: A pressing ring groove is formed around the pressure relief hole on the outer surface of the oil tank. The sealing ring includes a protruding part for cooperating with the pressing ring groove and a fitting part for fitting the outer surface of the oil tank at the orifice of the pressure relief hole.

[0009] As a further scheme of the present utility model: The protruding part and the pressing ring groove are in an interference fit.

[0010] As a further scheme of the present utility model: A plurality of through holes are formed along the circumferential direction on the ring surface of the pressing ring, and a plurality of locking screw holes are correspondingly formed along the circumferential direction on the outer side of the pressing ring groove. Each locking bolt passes through each through hole and is threadedly connected to each locking screw hole respectively, so as to press and seal the sealing ring in the pressing ring groove through the pressing ring.

[0011] As a further scheme of the present utility model: Along the axial direction of the pressure relief hole, the elastic expansion cap includes a connected cylindrical section and a conical section;

[0012] The cylindrical section is located between the sealing ring and the conical section, and the cylindrical section and the conical section form the inner wall of the elastic deformation cavity.

[0013] As a further scheme of the present utility model: The top end of the elastic expansion cap is inserted into the pressure relief hole, and the elastic deformation cavity inside the elastic expansion cap is in direct contact with the air to form an inner convex structure; The cross-section of one side of the sealing ring is an L shape bent towards the conical section.

[0014] As a further scheme of the present utility model: The oil tank includes a box body and a box cover hermetically covered on the box body; A plugging hole is formed on the box cover, the anode of the X-ray tube passes through the plugging hole and immerses into the oil tank, the cathode of the X-ray tube is fixedly installed on the box cover, and the X-ray tube and the plugging hole are hermetically matched with each other; A high-voltage circuit component for providing power to the X-ray tube is installed at the oil tank.

[0015] As a further solution of the utility model: The high-voltage circuit assembly includes a high-frequency transformer installed outside the fuel tank and used for connecting to an external power supply and boosting the external power supply, and a voltage-doubling rectifying device, a sampling device, a filtering device, and a spark-limiting current device immersed in the fuel tank;

[0016] The high-frequency transformer, the voltage-doubling rectifying device, the sampling device, the filtering device, and the spark-limiting current device are electrically connected in sequence, and the high-frequency transformer is also connected to the cathode of the X-ray tube, and the spark-limiting current device is electrically connected to the anode of the X-ray tube.

[0017] As a further solution of the utility model: Installation struts are fixedly installed inside the fuel tank, and fixing plates are fixedly installed on the installation struts. Both the voltage-doubling rectifying device and the sampling device are fixedly installed on the fixing plates.

[0018] As a further solution of the utility model: A fan for heat dissipation is installed at the high-frequency transformer, and the high-frequency transformer is located on the air flow path of the fan.

[0019] Compared with the prior art, the beneficial effects of the utility model are:

[0020] 1. When the heat generated by the electrical appliances inside the fuel tank causes the volume of the insulating oil to expand and the pressure to increase, the elastic expansion cap can automatically deform outward under the action of the pressure, thereby increasing the internal space of the fuel tank and effectively reducing the pressure. This mechanism does not require external power, responds quickly, and effectively avoids the risk of damage or oil leakage of the fuel tank due to excessive pressure.

[0021] 2. The utility model ensures the sealing performance of the elastic expansion cap at the pressure relief hole through the tight combination of the pressing ring and the positioning groove, and the locking screw hole and the locking bolt. This multiple-sealing design not only improves the sealing performance of the system, but also enhances the overall stability and durability, ensuring the stability of the internal environment of the fuel tank.

[0022] 3. The design of the elastic expansion cap makes full use of the elastic characteristics of the material and the close cooperation of the mechanical structure. The elastic expansion cap consists of a cylindrical section and a conical section. This structure not only ensures the sealing performance under normal pressure, but also can release the pressure through deformation when the pressure increases, achieving the perfect combination of structure and function. When the volume of the insulating oil in the fuel tank gradually increases, the conical section will deform first to release the pressure initially because of its larger contact area with the insulating oil and the pressure concentrated on its top. Then, when the pressure of the insulating oil gradually increases, the cylindrical section will also gradually deform and be slowly extruded out of the pressure relief hole, thereby realizing pressure reduction. Through the segmented pressure reduction, the pressure can change slowly, maintaining a small change range and improving the stability of the device operation.

[0023] 4. The installation and disassembly process of the elastic expansion cap is relatively simple. The design of the locking bolt enables users to conveniently inspect and replace the components of the breather, reducing maintenance costs and time. At the same time, this design also facilitates rapid intervention in case of emergencies to ensure the safe operation of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 Schematic diagram of the assembly structure of the fuel tank and the breather of the oil-immersed X-ray source device in a preferred embodiment of the present utility model;

[0025] Figure 2 Schematic diagram of the structure of the breather in the present utility model;

[0026] Figure 3 Schematic diagram of the structure of the elastic expansion cap in the present utility model;

[0027] Figure 4 Schematic diagram of the structure of the box body in the present utility model;

[0028] Figure 5 Schematic diagram of the structure of the box cover in the present utility model;

[0029] Figure 6 Schematic diagram of the assembly structure of the box body and the high-voltage circuit component in the present utility model;

[0030] Figure 7 Schematic diagram of the internal structure of the box body in the present utility model;

[0031] Figure 8 Schematic cross-sectional view of the interior of the box body of the oil-immersed X-ray source device in a preferred embodiment of the present utility model;

[0032] Figure 9 Schematic cross-sectional view of the first insulating housing and the second insulating housing in the present utility model;

[0033] Figure 10 Schematic cross-sectional view of the second insulating housing in the present utility model;

[0034] Figure 11 Schematic cross-sectional view of the X-ray source device in the present utility model;

[0035] Figure 12 Schematic diagram of the structure of the banana plug in the present utility model;

[0036] Figure 13 Schematic diagram of the assembly structure of the banana plug and the adapter in the present utility model;

[0037] Figure 14 Schematic diagram of the structure of the front apron in the present utility model;

[0038] Figure 15 This is the overall structural schematic diagram of the present utility model.

[0039] In the figure: 1. Protective cover; 11. Bottom plate; 111. Positioning strip; 12. Top plate; 13. Front enclosure; 131. End plate; 1311. Mounting plate; 13111. Fan; 132. Side plate; 1321. Convection hole; 14. Rear enclosure; 2. Fuel tank; 21. Box body; 211. Pressure relief hole; 212. Compression ring groove; 213. Locking screw hole; 214. Positioning groove; 22. Box cover; 231. Insertion hole; 232. Oil injection hole; 3. Mounting support; 31. Mounting hole; 32. Fixed plate; 4. High-voltage circuit assembly; 41. Voltage multiplier rectifier device; 42. Sampling device; 43. Filtering device; 44. Spark current-limiting device; 45. High-frequency transformer; 46. Inductor; 5. X-ray tube; 51. Anode; 511. Mounting screw hole; 52. Cathode; 6. Banana plug; 61. Threaded rod; 62. Spring piece end; 7. Adapter; 71. Axial hole; 72. Crown spring; 8. First insulating housing; 81. First connection hole; 9. Second insulating housing; 91. Positioning ear; 92. Voltage equalizing ring; 921. Second connection hole; 10. Breather; 101. Elastic expansion cap; 111. Cylindrical section; 112. Conical section; 113. Sealing ring; 113a. Protrusion; 113b. Fitting portion; 114. Compression ring; 102. Locking bolt. Detailed implementation manners

[0040] In the following description, numerous specific details are given to provide a more thorough understanding of the present utility model. However, it is obvious to those skilled in the art that the embodiments of the present utility model can be implemented without one or more of these details. In other examples, in order to avoid confusion with the embodiments of the present utility model, some well-known technical features in the art are not described.

[0041] In order to thoroughly understand the embodiments of the present utility model, detailed structures will be presented in the following description. Obviously, the implementation of the embodiments of the present utility model is not limited to the special details familiar to those skilled in the art. The preferred embodiments of the present utility model are described in detail as follows. However, in addition to these detailed descriptions, the present utility model can also have other embodiments and should not be construed as being limited to the embodiments presented here.

[0042] It should be understood that the purpose of the terms used herein is only to describe specific embodiments and is not a limitation of the present utility model. The singular forms of "a", "an" and "the" are also intended to include the plural forms unless the context clearly indicates otherwise. When the terms "comprising" and / or "including" are used in this specification, they specify the presence of the stated features, wholes, steps, operations, elements and / or components, but do not preclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or their combinations. The terms "upper", "lower", "front", "rear", "left", "right" and similar expressions used in the present utility model are for illustrative purposes only and not for limitation.

[0043] The ordinal numbers such as "first" and "second" cited in the present utility model are merely identifiers and do not have any other meanings, such as a specific order, etc. Moreover, for example, the term "first component" does not imply the existence of a "second component" by itself, and the term "second component" does not imply the existence of a "first component" by itself.

[0044] In this article, "equal", "same", etc. are not strict mathematical and / or geometric limitations, and also include the allowable errors that can be understood by those skilled in the art and are allowed in manufacturing or using, etc.

[0045] Unless otherwise specified, the numerical ranges in this article include not only the entire range within its two endpoints, but also several sub-ranges included therein.

[0046] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0047] Please refer to Figures 1 to 15 , according to a specific embodiment of the present utility model, the X-ray source device mainly includes a housing, an X-ray tube 5 installed on the housing, and a high-voltage circuit component 4 that provides power for the X-ray tube 5.

[0048] See Figures 6 to 8 and Figures 14 to 15 , the housing includes an oil tank 2 filled with insulating oil and a protective cover 1 covering the outside of the oil tank 2 for protection. The oil tank 2 includes a box body 21 with an open top and a hollow cuboid shape. The top of the box body 21 is hermetically covered with a box cover 22 through a sealing ring, and the box cover 22 is fixedly installed on the box body 21 through bolts. See Figure 7, the box body 21 is made of insulating material, and the outer surface of the box body 21 is covered with a metal material layer, and the metal layer plays a role of isolation and protection. The box cover 22 is made of conductive material.

[0049] Reference Figure 15 , the protective cover 1 includes a bottom plate 11, a top plate 12, a front enclosure plate 13 and a rear enclosure plate 14. The bottom plate 11 is generally in the shape of a cuboid and is used to be placed on. The fuel tank 2 is placed on the bottom plate 11, and a limiting relationship is generated between the two through a positioning component.

[0050] In the illustrated example, the positioning component includes a positioning strip 111 which is a cuboid strip-shaped convex fixed on the upper surface of the bottom plate 11, and the length of the positioning strip 111 is appropriate. Here, the positioning strip 111 can also be a convex of other shapes, that is, after being clamped up and down, the fuel tank 2 will not move on the upper surface of the bottom plate 11. The positioning strip 111 is located in the latter half part of the upper surface of the bottom plate 11. Usually, two or more positioning strips 111 are provided, and preferably two are arranged side by side along the length direction of the bottom plate 11. On the bottom surface of the box body 21 of the fuel tank 2, a positioning groove with both ends sealed is recessed, so that when the fuel tank 2 is placed on the bottom plate 11 from top to bottom in the vertical direction, the positioning strip 111 is embedded into the positioning groove, so as to realize the limiting relationship between the fuel tank 2 and the bottom plate 11 and prevent the fuel tank 2 from moving on the upper surface of the bottom plate 11. At the same time, in order to improve the stability of the limit, in the design, the cross-sectional dimension of the positioning groove is made to be approximately the same as that of the positioning strip 111, so as to eliminate the fitting gap between the two.

[0051] A limiting relationship is also generated between the top plate of the fuel tank 2 and the box cover 22 through a positioning component. On the upper end surface of the box cover 22 of the fuel tank 2, two or more positioning pins are fixedly installed. At the same time, positioning holes are opened on the top plate 12, so that when the top plate 12 is pressed on the box cover 22, the positioning pins are inserted into the positioning holes to prevent the top plate 12 and the box cover 22 from generating displacement along the plate surface direction of the top plate 12. A refillable insulating oil filling hole 232 (see Figure 5 ) is also provided on the box cover 22, and a valve can be installed at the filling hole 232 to control the opening and closing of the filling hole 232.

[0052] After the bottom plate 11, the fuel tank 2 and the top plate 12 are sequentially installed and fixed from bottom to top, then the U-shaped rear enclosure plate 14 is used to surround the fuel tank 2 from the back of the fuel tank 2. At the same time, the upper edge of the rear enclosure plate 14 surrounds a part of the outer edge of the top plate 12, and the lower edge of the rear enclosure plate 14 surrounds a part of the outer edge of the bottom plate 11. Screw holes are opened on the outer edges of the top plate 12 and the bottom plate 11, and through holes are opened at the upper port and the lower port of the rear enclosure plate 14. After the rear enclosure plate 14 is installed in place, bolts are used to pass through the through holes and be threadedly connected with the screw holes, so as to fix the top plate 12, the bottom plate 11 and the rear enclosure plate 14 into one body.

[0053] In order to improve the heat dissipation uniformity of the fuel tank 2 during operation, during design, the distances between the three corresponding faces of the installed fuel tank 2 and the three corresponding faces of the rear panel 14 can be made approximately the same, thereby forming a sandwich structure to evenly disperse heat in the sandwich.

[0054] The front panel 13 is configured as a U-shaped plate formed by enclosing two side plates 132 and one end plate 131, and both the side plates 132 and the end plate 131 are rectangular plates. Through holes are provided at the outer edges of the end plate 131, and through holes are also provided at the upper and lower outer edges of the side plates 132. Threaded holes are provided at the outer edges where the side plates 132 and the end plate 131 are in contact with each other. When assembling the side plates 132 and the end plate 131, after aligning the threaded holes on the side plates 132 with the through holes on the end plate 131, bolts are used to pass through the through holes and form a threaded fit with the threaded holes to fix the side plates 132 and the end plate 131 to each other, thereby forming a U-shaped plate.

[0055] The front panel 13 can also be formed by an integral fixed connection method, that is, the two side plates 132 and the one end plate 131 are connected together by welding to form an inseparable U-shaped plate.

[0056] The front panel 13 is used to wrap the fuel tank 2 from the front of the fuel tank 2, and the front panel 13 is fixed to the bottom plate 11 and the top plate 12 by bolts. The front panel 13, the rear panel 14, the top plate 12, and the bottom plate 11 enclose to form a receiving cavity for accommodating the fuel tank 2 and some electronic devices.

[0057] An installation space for installing electronic devices is formed between the front end face of the fuel tank 2 and the front panel 13. An inductor 46 and a high-frequency transformer 45 in the high-voltage circuit assembly 4 are installed in this installation space, and the inductor 46 is electrically connected to an externally connected 24V DC power supply. The voltage multiplier rectification device 41, the sampling device 42 for sampling the current frequency, the filtering device 43, and the spark-limiting current-limiting device 44 in the high-voltage circuit assembly 4 are installed inside the fuel tank 2.

[0058] Since there are multiple electronic devices arranged inside the installation space and the heat generation is large. Therefore, a window is opened on the end plate 131, and a detachable mounting plate 1311 is covered and installed on the window. A fan 13111 for blowing air to dissipate heat into the installation space is installed on the mounting plate 1311. At the same time, convection holes 1321 for facilitating the outflow of hot air are also opened on the side plates 132 (see Figure 14), so as to improve the heat dissipation efficiency. Some wiring connectors are also installed on the mounting plate 1311, including a power interface, a signal interface, a communication interface, and a chassis ground wire, which are used to provide power, data transmission, etc. for each electronic device in the installation space. In this embodiment, the ray device communicates with the outside through RS232, and the working parameters of the X-ray source device are controlled through the control device, so as to control the operation of the X-ray source device. It can also be adjusted according to actual needs, such as setting other types of communication interfaces. There can be two or more communication interfaces.

[0059] In the present utility model, the inductor 46 and the high-frequency transformer 45 are installed in the protective cover 1 outside the fuel tank 2, and a wind flow channel is designed and formed, and the fan 13111 and the convection holes 1321 are equipped, and this layout significantly improves the heat dissipation efficiency of the device.

[0060] Reference Figure 6 , a support frame is also provided in the installation space of the accommodation cavity. The support frame is supported and connected to the bottom plate 11, and the installation space is divided into upper and lower parts in the height direction. The inductor 46 and the high-frequency transformer 45 are installed in the upper space and arranged at intervals side by side. See Figure 14 and Figure 15 , a plurality of convection holes 1321 are provided in the front panel 13 at a position close to the high-frequency transformer 45. The fan 132 and the mounting plate 1311 are located in the lower space, and similarly, a plurality of convection holes 1321 are also provided in the lower part.

[0061] Figure 6 In the embodiment shown, on the one hand, the support frame can play a role in fixing and supporting the device, make full use of the installation space, and the compact structure can further reduce the overall volume of the X-ray source; on the other hand, it can play a role as a structural framework and improve the structural strength of the X-ray source device.

[0062] The insulating oil can not only achieve electrical isolation, but also help to cool the X-ray tube 5 and some high-voltage circuit components 4. Through the forced air cooling method, the fuel tank 2 and the inductor 46 and the high-frequency transformer 45 outside the fuel tank 2 can be cooled more quickly, preventing overheating, thereby prolonging the service life of the equipment and improving the operation stability. Exemplarily, the insulating oil is transformer oil.

[0063] The design of the protective cover 1 also provides an additional layer of safety protection, preventing accidental contact or external damage and enhancing the safety of the device. Since some of the high-voltage circuit components 4 are located outside the fuel tank 2, it makes the operation more convenient when maintenance, repair or replacement of these components is required, without the need to fully open the fuel tank 2, thus saving maintenance time and costs. By reasonably arranging and designing the heat dissipation system, this oil-immersed radiation device can manage heat more effectively, reduce performance degradation or failures caused by high temperature, enabling the X-ray source device to operate stably for a long time, and thus ensuring the accuracy of the X-ray source output. This is particularly important for application scenarios that require continuous and efficient operation. By adding the design of the fan 13111 and the air flow channel, the device can better adapt to the temperature conditions in different working environments and maintain a better working state whether in high temperature or relatively enclosed spaces, improving the environmental adaptability and flexibility of the device.

[0064] An insulating mounting pillar 3 is installed inside the fuel tank 2. The top end of the mounting pillar 3 is coaxially inserted into the mounting hole 31 opened on the inner end face of the tank cover 22 (see Figure 7 ), and the top end of the mounting pillar 3 is clamped and matched with the mounting hole 31 to fix the mounting pillar 3 and the tank cover 22. In this embodiment, the bottom end of the mounting pillar 3 is supported on the first insulating housing 8. The top end of the mounting pillar 3 can be in interference fit with the mounting hole 31.

[0065] In this embodiment, the lower end of the mounting pillar 3 is supported and connected to the first insulating housing 8, which can save the mounting space and reduce the volume of the fuel tank 2. In other embodiments not shown in the present utility model, the lower end of the mounting pillar can be supported and connected to the bottom of the fuel tank.

[0066] See Figure 6 , an insulating fixing plate 32 is also fixedly installed on the mounting pillar 3. A voltage multiplier rectifying device 41 and a sampling device 42 are sequentially installed on the fixing plate 32 from top to bottom. A first insulating housing 8 is installed at the inner bottom of the fuel tank 2 (see Figure 7 and Figure 8 ), and a filtering device 43 is installed inside the first insulating housing 8. And the first insulating housing 8 is respectively provided with first connection holes 81 communicating with the inside of the box body 21 at both ends along the width direction of the fuel tank 2 (see Figures 8 to 10 ), for insulating oil to flow in and fill the inside of the first insulating housing 8.

[0067] A second insulating housing 9 is also installed in the fuel tank 2. Specifically, in the present embodiment, the second insulating housing 9 extends along the height direction of the fuel tank 2, and both the upper and lower ends are open ends. A flange for fixedly connecting the first insulating housing 8 is installed at the bottom end of the second insulating housing 9. The top end of the second insulating housing 9 is a round hole end, and positioning lugs 91 are fixedly installed on the hole wall of the round hole end. An overcurrent gap 93 is left between the positioning lugs 91 and the hole wall of the round hole end (see Figure 8 ), and a guiding hole is provided on the positioning lugs 91.

[0068] An adapter 7 with a two-stage stepped shape that is smaller at the top and larger at the bottom is coaxially penetrated with an axial hole 71, and an external thread is coaxially provided on the outer circumferential surface of the small-diameter end of the adapter 7. An internal threaded hole is coaxially penetrated at the center of the voltage equalizing ring 92. The small-diameter section of the adapter 7 passes through the guiding hole in the middle of the positioning lugs from bottom to top and is threadedly connected to the internal threaded hole of the voltage equalizing ring 92, so that the adapter 7, the positioning lugs 91, and the voltage equalizing ring 92 are tightly fixed together.

[0069] Refer to Figures 7 to 13 , the anode 51 of the X-ray tube 5 is electrically connected to the conductive socket at the output end of the high-voltage circuit assembly 4 (i.e., the output end of the spark-limiting current-limiting device 44) through an electrical connector. The anode 51 is provided with a mounting screw hole 511 with an opening vertically downward. The conductive socket (adapter 7) is located vertically below the anode 51. The conductive socket forms a socket hole (axial hole 71), and the opening of the socket hole is vertically upward. The electrical connector is configured as a plug-in electrical connector. The reliable connection between the X-ray tube 5 and the high-voltage circuit assembly 4 can be achieved by plugging, and at the same time, it is also convenient for the disassembly, installation, maintenance, and replacement of the X-ray tube 5.

[0070] Exemplarily, the electrical connector can be a banana plug 6. The first end of the banana plug 6 can be detachably connected to the mounting screw hole 511 of the anode 51. For example, in the present embodiment, it is a threaded connection. The second end of the banana plug 6 is used for plugging and mating with the socket hole. The second end of the banana plug 6 is usually a spring piece end 62, and its outer surface is designed with outwardly protruding spring pieces. When the second end of the banana plug 6 is inserted into the socket hole, the spring pieces contact the inner wall of the socket hole and are deformed under pressure, and the elastic force generated by the deformation of the spring pieces ensures that the second end of the banana plug 6 can be pressed tightly against the socket hole. Thus, the reliable connection between the electrical connector and the conductive socket can be achieved, and further, the reliable connection between the anode 51 and the anode high-voltage power supply can be ensured.

[0071] The electrical connector can also be a pin that matches the size of the socket hole, and one end of the pin and the mounting screw hole 511 of the anode 51 are fixedly connected to each other. Preferably, in order to improve the reliability of the electrical connection, a crown spring 72 can be arranged in the socket hole. Those skilled in the art know that the crown spring 72 includes end bands respectively arranged at both ends of the crown spring along the axial direction of the crown spring, and a plurality of spring pieces connected between the two end bands and arranged at intervals. The spring pieces have contact parts protruding towards the axis direction of the crown spring. Each spring piece has a certain elasticity and can be deformed when subjected to pressure and can return to its original state after the pressure disappears.

[0072] When the X-ray tube 5 is installed, the lower end of the pin and the crown spring 72 in the socket hole are inserted and matched. The body of the crown spring 72 can form an electrical contact with the socket hole. After the pin is inserted, the spring pieces of the crown spring 72 will produce elastic deformation under the extrusion of the pin, and the contact parts of the spring pieces can be in close contact with the surface of the pin under the action of the elastic force to form a reliable electrical connection.

[0073] Of course, like in the illustrated embodiment, the electrical connector can adopt a banana plug 6, and at the same time, a crown spring 72 is arranged in the socket hole.

[0074] Reference Figure 13 In the illustrated embodiment, a crown spring 72 that cooperates with the banana plug 6 is coaxially installed in the axial hole 71. Combining Figure 8 , the conductive column at the wiring terminal of the spark suppression and current limiting device 44 installed inside the second insulating housing 9 is inserted into the axial hole 71 from bottom to top and is electrically connected to the crown spring 72. Then, the second insulating housing 9 as a whole and the first insulating housing 8 are assembled.

[0075] In this embodiment, the bottom plate of the second insulating housing 9 simultaneously constitutes a part of the top plate of the first insulating housing 8 (see Figure 8 ), which is convenient for the assembly of electronic devices inside the insulating housing, saves space, and reduces the volume and weight of the X-ray source device. The first insulating housing 8 and the second insulating housing 9 can be two independent components.

[0076] The spark suppression and current limiting device 44 is pressed against the upper part of the first insulating housing 8, and then the second insulating housing 9 is fixed to the first insulating housing 8 by using bolts to pass through the flange (refer to Figure 9 , Figure 10 ). Both the first insulating housing 8 and the second insulating housing 9 are provided with wire passing holes (not shown in the figure) for wires to pass through. The wires pass through the two wire passing holes to electrically connect the filtering device 43 and the spark suppression and current limiting device 44.

[0077] Continue to refer to Figure 8, a second connection hole 921 communicating with the current-carrying gap 93 and the interior of the box body 21 is formed in the voltage equalizing ring 92, so that insulating oil enters from the second connection hole 921, passes through the current-carrying gap 93 and flows into the interior of the second insulating housing 9 to immerse the spark-limiting current-limiting device 44.

[0078] In this embodiment, by introducing the combination of the banana plug 6 and the crown spring 72, a convenient and stable electrical connection of the anode 51 of the X-ray tube 5 is achieved. This design is not only novel but also improves the reliability and maintainability of the device. Because the plugging method of the banana plug 6 and the crown spring 72 allows for quick connection and disconnection, reducing the operation complexity and time cost. At the same time, the banana plug 6 is coaxially and elastically inserted into the crown spring 72, and this tight contact method ensures efficient transmission of electric energy, reduces energy loss, improves the working efficiency of the X-ray tube 5, and reduces the risk of electrical faults caused by poor contact.

[0079] The high-voltage circuit component 4 and the cathode 52 are connected by a wire. Based on the flexibility of the wire, the limitation of the position between the high-voltage circuit component 4 and the cathode 52 can be eliminated, providing a better plugging angle for the plugging of the anode 51, so as to quickly and accurately plug the banana plug 6 into the crown spring 72 and improve the working efficiency.

[0080] The oil-immersed design places the X-ray tube 5 and its high-voltage circuit component 4 in insulating oil. The insulating oil has good insulation and heat dissipation properties, which can effectively prevent electrical short circuits and overheating, thereby improving the safety and stability of the entire device. Exemplarily, the insulating oil can be transformer oil. In addition, the oil-immersed environment can also play a certain shock-absorbing role for the X-ray tube 5 and extend its service life. Due to the adoptable pluggable banana plug 6 design, when maintenance or replacement of the X-ray tube 5 or the high-voltage circuit component 4 is required, the connection or disconnection operation can be quickly completed without a complex disassembly process, greatly improving the maintenance efficiency. Specifically, in combination with the covering connection method of the box body 21 and the box cover 22 of the fuel tank 2, when the box body 21 and the box cover 22 are separated up and down, the X-ray tube 5 and the high-voltage circuit component 4 can be separated, facilitating the inspection and replacement of the faulty X-ray tube.

[0081] The most direct function of the first insulating housing 8 and the second insulating housing 9 is to provide electrical insulation, preventing the filtering device 43 and the spark-limiting current-limiting device 44 from making electrical contact with other conductive components in the fuel tank 2 during operation, thereby avoiding electrical faults such as short circuits and electric leakage. This is one of the important measures to ensure the safe and stable operation of the device.

[0082] When the X-ray device is operating, it may generate electromagnetic radiation and electromagnetic interference, which may affect the normal operation of the filtering device 43 and the spark-limiting current-limiting device 44. The existence of the insulating housing can isolate these electromagnetic interferences to a certain extent and protect the device from their influence.

[0083] By sleeving an insulating housing, the filtering device 43 and the arc-striking current-limiting device 44 can be effectively isolated from other components in the fuel tank 2, reducing potential safety hazards caused by equipment failures or improper maintenance. At the same time, the presence of the insulating housing can also improve the shock resistance, vibration resistance, etc. of the equipment to a certain extent, enhancing the overall safety and reliability of the equipment.

[0084] See Figure 7 、 Figure 8 and Figure 11 As shown in

[0085] See Figure 5 、 Figure 7 and Figure 8 In the present utility model, an L-shaped X-ray tube 5 is adopted. The anode 51 of the X-ray tube 5 is installed inside the fuel tank 2, the cathode 52 of the X-ray tube 5 is installed outside the fuel tank 2, and the emission port of the X-ray tube 5 is also installed outside the fuel tank 2.

[0086] After the X-ray tube 5 is installed, the X-ray tube 5 is still fixed to the top plate 12 and the tank cover 22 by means of bolts cooperating with the flange on the X-ray tube 5. Correspondingly, a sealing rubber ring is installed at the plugging hole 231 to prevent oil leakage from the plugging hole 231.

[0087] Refer to Figures 11 to 13 As shown in

[0088] See Figure 6 and Figure 7 On the body 21 of the fuel tank 2, a breather 10 is also hermetically arranged, which can absorb the expanded volume of the insulating oil in the fuel tank 2 after being heated through elastic deformation.

[0089] See Figures 1 to 4 As shown in Figure 3)。The other end of the cylindrical section 1011 is turned outwards to form an annular sealing ring 113, and a pressing ring 114 is coaxially fixed on the ring surface of the sealing ring 113 close to the conical section 112.

[0090] Specifically, referring to Figure 3 , the sealing ring 113 includes a protruding portion 113a for cooperating with the pressing ring groove 212 and a fitting portion 113b for fitting the outer surface of the fuel tank 2 (at the orifice of the pressure relief hole 211).

[0091] An annular pressing ring groove 212 is coaxially recessed on the outer end surface of the pressure relief hole 211. The elastic expansion cap 101 is inserted into the pressure relief hole 211, and the pressing ring 114 is embedded in the positioning groove. At the same time, the fuel tank 2 is also provided with a locking screw hole 213 outside the pressing ring groove 212. The pressing ring 114 is coaxially pressed on the sealing ring 113 of the elastic expansion cap 101, and the locking bolt 102 passes through the through hole on the pressing ring 114 and is threadedly connected with the locking screw hole 213, thereby sealing and pressing the elastic expansion cap 101 at the pressure relief hole 211.

[0092] The heat generated by the ray tube and other electronic devices located inside the fuel tank 2 during operation diffuses into the insulating oil. The temperature rise of the insulating oil will cause volume expansion. At this time, the elastic expansion cap 101 will deform outwards under the action of the extrusion of the insulating oil. The deformation of the elastic expansion cap 101 will expand the volume of the sealed space inside the fuel tank 2, effectively reducing the pressure inside the fuel tank 2, so as to prevent the fuel tank 2 from bursting due to excessive internal pressure, prevent the insulating oil from overflowing from each joint, effectively achieve pressure reduction, and then ensure the stable operation of the ray source device. This mechanism does not require external power and has a rapid response. And the utility model ensures the sealing performance of the elastic expansion cap 101 at the pressure relief hole 211 through the close combination of the pressing ring 114 with the positioning groove and the locking screw hole 213 with the locking bolt 102. This multiple-sealing design not only improves the sealing performance of the system, but also enhances the overall stability and durability, ensuring the stability of the internal environment of the fuel tank 2.

[0093] The principle of the breather 10 is that the working expansion volume of the breather 10 should be greater than the expansion volume of the insulating oil caused by the temperature rise during the operation of the X-ray source device.

[0094] The protruding surface of the elastic expansion cap 101 contacts the insulating oil inside the fuel tank 2, and the concave part contacts the air; when the oil temperature rises, the insulating oil expands and squeezes out the air in the concave part of the elastic expansion cap 101; when the oil temperature is lower than the temperature of the sealed oil, the insulating oil shrinks, and the elastic expansion cap 101 continues to sink inwards to ensure the relative balance of the internal and external pressures during expansion and contraction.

[0095] The working expansion volume of the elastic expansion cap 101 is approximately 20 ml. The material of the elastic expansion cap 101 is preferably fluororubber with good oil resistance. Through long-term testing, it is known that this elastic expansion cap 101 can work under a pressure difference of 0.2 Mpa for a long time.

[0096] According to a specific embodiment of the present invention, the calculation method of the expansion volume of the transformer oil in the fuel tank 2 is as follows: The expansion coefficient of No. 25 transformer oil is 0.0007, the volume of the transformer oil in the fuel tank 2 is 1.4 L, and the maximum temperature rise of the internal insulating oil of the X-ray tube 5 is 15 °C. Then the expansion volume is 14.7 ml. The working expansion volume of the elastic expansion cap 101 can reach 20 ml. Therefore, the elastic expansion cap 101 can meet the usage requirements of the radiation source.

[0097] See Figure 3 , the design of the elastic expansion cap 101 makes full use of the elastic characteristics of the material and the close cooperation of the mechanical structure. The elastic expansion cap 101 is composed of a cylindrical section 1011 and a conical section 112. This structure not only ensures the sealing performance under normal pressure but also can release pressure through deformation when the pressure increases, achieving the perfect combination of structure and function. When the volume of the insulating oil in the fuel tank 2 gradually increases, the conical section 112 will deform first to release the pressure initially because its contact area with the insulating oil is large and the pressure it receives is concentrated at its top, prior to the cylindrical section 1011 that is evenly stressed circumferentially. Then, when the pressure of the insulating oil gradually increases, the cylindrical section 1011 will also gradually deform and be slowly extruded out of the pressure relief hole 211, thereby achieving pressure reduction. Through the segmented pressure reduction, the pressure can change slowly, maintaining a small change range and improving the stability of the device operation.

[0098] It should be noted that the "cylindrical section" and "conical section" described above refer to approximately this shape, not a shape limitation.

[0099] The installation and disassembly process of the breather 10 is relatively simple. The design of the locking bolt 102 enables users to conveniently inspect and replace the breather 10 components, reducing the maintenance cost and time. At the same time, this design also facilitates quick intervention in case of an emergency to ensure the safe operation of the equipment.

[0100] The utility model is a micro-focus X-ray device, which is powered by DC24V. Through internal DC-DC high-frequency conversion at all levels, the cathode, grid, filament, and anode high voltage required for the operation of the micro-focus X-ray tube 5 are made equipotential, so as to realize the output of micro-focus X-rays. The micro-focus rays of the micro-focus X-ray device are generated by the micro-focus X-ray tube 5. For the effective operation of the micro-focus X-ray tube 5, an anode high voltage, a cathode, a grid suspended (electric potential suspension) above the cathode, and a hot filament power supply need to be provided. The hot filament heats active electrons, the cathode and the grid control the focusing and emission ability of the electron beam, and the anode electric field pulls the electron beam to bombard the anode target to generate micro-focus X-rays.

[0101] Among them, the anode power supply uses a series resonance topology to invert the externally input DC24V into a high-frequency AC signal of 60 - 120kHz, step it up to AC7kV through the high-frequency transformer 45, then send it to the voltage multiplier rectifier device 41 for rectification, and after passing through the filtering device 43, a DC high voltage of up to 100kV is achieved. After passing through the sparking current limiting device 44, it is transmitted to the anode 51 through the banana plug 6, and then the cathode 52 is powered on to realize the excitation of X-rays.

[0102] Inversion process:

[0103] The externally connected DC24V DC voltage passes through the inductor 46 and is then converted into a high-frequency AC signal of 60 - 120kHz by the high-frequency transformer 45. This inversion process is usually realized by controlling IGBT insulated gate bipolar transistors or other types of switching devices through PWM pulse width modulation. The selection of the high-frequency AC signal is to reduce the volume and weight of the transformer, and at the same time improve the efficiency and response speed of the system.

[0104] Step-up process:

[0105] The high-frequency AC signal is then sent to the high-frequency transformer 45 for step-up. The high-frequency transformer 45 uses the principle of electromagnetic induction to convert the AC signal with low voltage and high current into an AC signal with high voltage and low current. In an embodiment of the utility model, the voltage can be stepped up to AC 7kV. The use of the high-frequency transformer 45 makes the step-up process more compact and efficient.

[0106] Rectification process:

[0107] The boosted high-voltage AC signal is sent to the voltage multiplier rectifier device 41 for rectification. Voltage multiplier rectification is a technology that uses components such as capacitors and diodes to convert AC voltage into DC voltage and at the same time realizes voltage multiplication. Through multi-stage voltage multiplier rectification, a higher DC voltage output can be obtained. In an embodiment of the utility model, a DC high voltage of up to 100kV can be achieved.

[0108] Filtering process:

[0109] The rectified DC high-voltage signal may contain certain ripples and noises, so it needs to be filtered by the filtering device 43. The filtering device 43 usually includes components such as capacitors and inductors, which can smooth the DC voltage waveform, reduce the ripple coefficient, and improve the voltage stability.

[0110] Arc-suppressing current-limiting device 44:

[0111] Before connecting the anode 51 of the X-ray tube 5, an arc-suppressing current-limiting device 44 is usually set. The main function of this device is to protect the X-ray tube 5 and the entire power supply system from current surges and damages caused by arcing, that is, local discharge phenomena on the anode target. When arcing occurs, the current-limiting device can quickly limit the magnitude of the current to prevent excessive current from damaging the equipment.

[0112] Connection of the anode 51 of the X-ray tube 5:

[0113] The stable DC high voltage after the above processing is finally sent to the anode 51 of the X-ray tube 5. Under the action of the high-voltage electric field formed between the anode 51 and the cathode 52, the electrons released by the cathode 52 are accelerated and strike the anode target, thereby generating X-rays.

[0114] In summary, the anode power supply design of the micro-focus X-ray device of the present utility model is a complex and precise systematic project, which involves multiple technical links such as inversion, boosting, rectification, filtering, and current-limiting protection. Through the coordinated action of these links, the conversion from low-voltage DC input to high-voltage DC output is achieved, and the stable operation and high efficiency of the X-ray tube 5 are ensured.

[0115] The above is only the preferred specific embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model, according to the technical solution of the present utility model and its inventive concept, makes equivalent substitutions or changes, and all should be covered within the protection scope of the present utility model.

Claims

1. Oil-immersed X-ray source device, comprising an oil tank (2) filled with insulating oil, and an X-ray tube (5) hermetically installed in the oil tank (2) and used for generating X-rays, characterized in that, A pressure relief hole (211) is formed in the fuel tank (2), and an elastic expansion cap (101) that can contact the insulating oil and deform under pressure to relieve pressure is hermetically covered at the pressure relief hole (211); a sealing ring (113) that can fit at the orifice of the pressure relief hole (211) is arranged on the elastic expansion cap (101); a pressing ring (114) is further included, and the pressing ring (114) is detachably connected to the fuel tank (2) to press the sealing ring (113) at the orifice of the pressure relief hole (211) to achieve sealing at the pressure relief hole (211); when the elastic expansion cap (101) is installed on the fuel tank (2), at least a part of the middle of the elastic expansion cap (101) is recessed into the fuel tank (2) to form an elastic deformation cavity.

2. The oil-immersed X-ray source device according to claim 1, wherein A pressing ring groove (212) is formed on the outer surface of the fuel tank (2) around the pressure relief hole (211), and the sealing ring (113) includes a protruding part for cooperating with the pressing ring groove (212) and a fitting part for fitting the outer surface of the fuel tank (2) at the orifice of the pressure relief hole (211).

3. The oil-immersed X-ray source device according to claim 2, wherein, The protruding part and the pressing ring groove are in interference fit.

4. The oil-immersed X-ray source device according to claim 1 or 2 or 3, characterized in that, A plurality of through holes are formed in the circumferential direction on the ring surface of the pressing ring (114), and a plurality of locking screw holes (213) are correspondingly formed in the circumferential direction on the outer side of the pressing ring groove (212). Each locking bolt (102) passes through each through hole and is threadedly connected to each locking screw hole (213) respectively to press and seal the sealing ring (113) in the pressing ring groove (212) through the pressing ring (114).

5. The oil-immersed X-ray source device according to claim 1 or 2 or 3, characterized in that, Along the axial direction of the pressure relief hole (211), the elastic expansion cap (101) includes a connected cylindrical section (1011) and a conical section (112); the cylindrical section (1011) is located between the sealing ring (113) and the conical section (112), and the cylindrical section (1011) and the conical section (112) form the inner wall of the elastic deformation cavity.

6. The oil-immersed X-ray source device according to claim 5, wherein The top end of the elastic expansion cap (101) is inserted into the pressure relief hole (211), and the elastic deformation cavity inside the elastic expansion cap (101) is in direct contact with the air to form an inwardly convex structure; the cross section of one side of the sealing ring (113) is L-shaped bent towards the conical section (112).

7. The oil-immersed X-ray source device according to claim 1 or 2 or 3, characterized in that, The fuel tank (2) includes a box body (21) and a box cover (22) hermetically covered on the box body (21); a plugging hole (231) is formed in the box cover (22), the anode (51) of the X-ray tube (5) passes through the plugging hole (231) and immerses into the fuel tank (2), the cathode (52) of the X-ray tube (5) is fixedly installed on the box cover (22), and the X-ray tube (5) and the plugging hole (231) are hermetically matched with each other; a high-voltage circuit component (4) for supplying power to the X-ray tube (5) is installed at the fuel tank (2).

8. The oil-immersed X-ray source device according to claim 7, wherein The high-voltage circuit assembly (4) includes a high-frequency transformer (45) installed outside the fuel tank (2) and used to connect to an external power supply and boost the external power supply, as well as a voltage multiplier rectification device (41), a sampling device (42), a filtering device (43), and a spark current-limiting device (44) immersed in the fuel tank (2); the high-frequency transformer (45), the voltage multiplier rectification device (41), the sampling device (42), the filtering device (43), and the spark current-limiting device (44) are electrically connected in sequence, and the high-frequency transformer (45) is also connected to the cathode (52) of the X-ray tube (5), and the spark current-limiting device (44) is electrically connected to the anode (51) of the X-ray tube (5).

9. The oil-immersed X-ray source device according to claim 8, wherein, An installation support (3) is fixedly installed inside the fuel tank (2), and a fixing plate (32) is fixedly installed on the installation support (3). Both the voltage multiplier rectification device (41) and the sampling device (42) are fixedly installed on the fixing plate (32).

10. The oil-immersed X-ray source device according to claim 9, wherein A fan (13111) for heat dissipation is installed at the high-frequency transformer (45), and the high-frequency transformer (45) is located on the air flow path of the fan (13111).

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