Miniaturized X-ray generator

Abstract

The utility model relates to the technical field of X-ray devices, in particular to a miniaturized X-ray generator. Comprising an oil tank filled with insulating oil, an X-ray tube installed in the oil tank in a sealed mode and used for generating X-rays, and a high-voltage circuit assembly providing power for the X-ray tube. An insulating shell is arranged in the oil tank, at least part of electronic devices forming the high-voltage circuit assembly are located in the insulating shell, and a connecting hole allowing insulating oil to enter so as to fill a shell cavity of the insulating shell is formed in the insulating shell. According to the X-ray generator disclosed by the utility model, the possibility of electrical faults in the working process of the X-ray generator can be reduced to the greatest extent through the dual insulation effect of the insulating oil entering the insulating shell through the connecting hole and the insulating shell, the safe and stable operation of the device is ensured, meanwhile, the insulating structure of the X-ray generator is simplified, and the overall volume of the X-ray generator is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of ray devices, in particular to a miniaturized X-ray generator. Background Art

[0002] As a ray generator, an X-ray tube has been widely used in various different 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. During the operation of the X-ray tube, relatively high heat is generated and its heat dissipation performance is poor, which will lead to unstable X-ray output intensity and affect the performance of the equipment.

[0003] Therefore, in order to solve the problem of heat dissipation of the X-ray tube, Patent CN206283706U discloses a dental X-ray machine head for solving the problem that the machine head is prone to spark when outputting a high-power X-ray source. Although the above-mentioned prior art can effectively solve the problem of sparking of the machine head, it is not difficult to find that the above-mentioned prior art only insulates the box body shell, while the filament transformer, the positive terminal voltage doubling rectifying and filtering unit, the high-frequency high-voltage transformer and the negative terminal voltage doubling rectifying and filtering unit are placed in the transformer oil but not much insulated. During the operation of the X-ray generator, high-voltage current is required. In this case, there may be current leakage between the electronic devices in the fuel tank, and then a short circuit may occur, ultimately resulting in damage to the electronic devices and the device being unable to work properly.

[0004] It can be seen that electrical insulation treatment needs to be carried out in the existing ray device to maintain the normal working state of the device. Content of the Utility Model

[0005] In order to avoid and overcome the technical problems existing in the prior art, the utility model provides a miniaturized X-ray generator. The utility model can effectively reduce the probability of current leakage in the fuel tank and improve the stability of the device operation.

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

[0007] A miniaturized X-ray generator, comprising a fuel tank filled with insulating oil, an X-ray tube sealed and installed in the fuel tank and used for generating X-rays, and a high-voltage circuit component for providing power to the X-ray tube;

[0008] An insulating housing is arranged in the fuel tank, at least part of the electronic devices constituting the high-voltage circuit component are located in the insulating housing, and a connection hole is opened on the insulating housing for insulating oil to enter and fill the cavity of the insulating housing.

[0009] As a further solution of the present utility model: The high-voltage circuit assembly includes a filtering device and a spark-limiting current device installed in the fuel tank; the spark-limiting current device is electrically connected to the anode of the X-ray tube and the filtering device;

[0010] The insulating housing includes a first insulating housing and a second insulating housing. The filtering device is installed in the first insulating housing, and the spark-limiting current device is installed in the second insulating housing;

[0011] Wherein, the first insulating housing is provided with a first connection hole for insulating oil to enter the inside of the first insulating housing, and the second insulating housing is provided with a second connection hole for insulating oil to enter the inside of the second insulating housing.

[0012] As a further solution of the present utility model: A cavity with two open ends is formed inside the second insulating housing, and the spark-limiting current device is fixedly installed in the second insulating housing; the bottom end of the second insulating housing abuts against the first insulating housing to close the opening at the bottom of the cavity;

[0013] The wiring terminal of the X-ray tube anode extends into the cavity from the opening at the top of the cavity and is electrically connected to the wiring terminal of the spark-limiting current device.

[0014] As a further solution of the present utility model: A grading ring is installed between the wiring terminal of the X-ray tube anode and the wiring terminal of the spark-limiting current device, and the second connection hole connecting the internal cavity of the second insulating housing and the inside of the tank is opened on the grading ring.

[0015] As a further solution of the present utility model: There are multiple second connection holes, and the multiple second connection holes are evenly distributed on the ring surface of the grading ring along the circumferential direction of the grading ring.

[0016] As a further solution of the present utility model: An insulating fixing plate is fixedly installed in the fuel tank. The electronic devices constituting the high-voltage circuit assembly include a voltage multiplier rectifier device and a sampling device installed in the fuel tank and electrically connected to each other. The voltage multiplier rectifier device is electrically connected to the filtering device;

[0017] The voltage multiplier rectifier device and the sampling device are respectively fixedly installed on both sides of the fixing plate.

[0018] As a further solution of the present utility model: The high-voltage circuit assembly further 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; the high-frequency transformer is electrically connected to the voltage multiplier rectifier device and the cathode of the X-ray tube.

[0019] As a further solution of the present utility model: A fan for heat dissipation is installed outside the fuel tank near the high-frequency transformer, and the high-frequency transformer is located on the air flow path of the fan.

[0020] As a further solution of the utility model: The fuel tank includes a box body and a box cover hermetically covered on the box body; a plug hole is provided on the box cover, the anode of the X-ray tube passes through the plug hole and immerses into the fuel tank, the cathode of the X-ray tube is fixedly installed on the box cover, and the X-ray tube and the plug hole are hermetically matched with each other;

[0021] When the box cover is covered and connected to the box body, the anode of the X-ray tube is located vertically above the insulating housing.

[0022] As a further solution of the utility model: The box body of the fuel tank is a box body made of insulating material, and a metal material layer is covered on the outer surface of the box body; and / or the box cover is a box cover made of conductive material.

[0023] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0024] 1. The most direct function of the insulating housing used in the utility model is to provide electrical insulation, prevent electrical contact between various electronic devices in the fuel tank during operation, and thus avoid electrical faults such as short circuits and electric leakage. At the same time, the insulating oil entering the insulating housing and the insulating housing play a dual insulating role, which can reduce the possibility of electrical faults to the greatest extent, ensure the safe and stable operation of the device, and can reduce the overall volume of the X-ray generator as much as possible while ensuring the insulating effect.

[0025] 2. The ray device may generate electromagnetic radiation and electromagnetic interference during operation, and these interferences may affect the normal operation of the filtering device and the spark-limiting current-limiting device. The existence of the insulating housing can isolate these electromagnetic interferences to a certain extent, protect the equipment from their influence, and ensure the accuracy and reliability of the equipment.

[0026] 3. By sleeving the insulating housing, the filtering device and the spark-limiting current-limiting device can be effectively isolated from other components in the fuel tank, reducing potential safety hazards caused by equipment failures or improper maintenance. At the same time, the existence of the insulating housing can also improve the shock resistance, vibration resistance, etc. of the equipment to a certain extent, and improve the overall safety and reliability of the equipment. Description of the Drawings

[0027] Figure 1 It is a schematic cross-sectional structure diagram inside the box body of the X-ray generator in the utility model.

[0028] Figure 2 It is a schematic structure diagram inside the box body in the utility model.

[0029] Figure 3 It is a schematic cross-sectional structure diagram of the first insulating housing and the second insulating housing in the utility model.

[0030] Figure 4It is a schematic cross-sectional structural diagram of the second insulating shell in the utility model.

[0031] Figure 5 It is a structural schematic diagram of the box cover in the utility model.

[0032] Figure 6 It is a schematic diagram of the assembly structure of the box body and the high-voltage circuit component in the utility model.

[0033] Figure 7 It is a schematic cross-sectional structural diagram of the X-ray generator in the utility model.

[0034] Figure 8 It is a schematic diagram of the structure of the banana plug in the utility model.

[0035] Figure 9 The figure is a schematic diagram of the assembly structure of the banana plug and the adapter in the utility model.

[0036] Figure 10 It is a structural schematic diagram of the front panel in the utility model.

[0037] Figure 11 It is a schematic diagram of the overall structure of the utility model.

[0038] In the figure: 1, protective cover; 11, bottom plate; 111, positioning strip; 12, top plate; 13, front panel; 131, end plate; 1311, mounting plate; 13111, fan; 132, side plate; 1321, convection hole; 14, rear panel; 2, oil tank; 21, box body; 211, pressure relief hole; 212, clamping ring groove; 214, positioning groove; 22, box cover; 231, plug hole; 232, oil filling hole; 3, mounting support; 31, mounting hole; 32, fixing plate; 4, high-voltage circuit assembly; 41, voltage doubler 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. Shrapnel end; 7. Adapter; 71. Axial hole; 72. Crown spring; 8. First insulating shell; 81. First connecting hole; 9. Second insulating shell; 91. Positioning lug; 92. Equalizing ring; 93. Current gap; 921. Second connecting hole; 10. Respirator. DETAILED DESCRIPTION

[0039] In the following description, a large number of specific details are given to provide a more thorough understanding of the present invention. However, it is obvious to those skilled in the art that the present invention can be implemented without one or more of these details. In other examples, in order to avoid confusion with the present invention, some technical features known in the art are not described.

[0040] 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 specific details familiar to those skilled in the art. The preferred embodiments of the present utility model are described in detail below. However, in addition to these detailed descriptions, the present utility model may have other embodiments and should not be construed as limited to the embodiments presented here.

[0041] 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 "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 limitations.

[0042] 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.

[0043] 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.

[0044] Unless otherwise specified, the numerical ranges in this article include not only the entire range between its two endpoints, but also several sub-ranges included therein.

[0045] 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. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present utility model.

[0046] Please refer to Figures 1 to 11 , according to a specific embodiment of the present utility model, the X-ray generator mainly includes a housing, an X-ray tube 5 installed on the housing, and a high-voltage circuit assembly 4 that provides power to the X-ray tube 5.

[0047] See Figure 1 、 2 、6, 10 and 11, the outer shell 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 sealed and 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 2 , 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.

[0048] Reference Figure 11 , 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 cuboid-shaped and is used to be placed on the ground. The oil tank 2 is placed on the bottom plate 11, and a limiting relationship is generated between the two through a positioning component.

[0049] The positioning component includes a positioning strip 111 which is a convex cuboid strip fixedly arranged 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 the upper and lower clamping, the oil 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. A positioning groove with both ends sealed is recessed on the bottom surface of the box body 21 of the oil tank 2, so that when the oil 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 oil tank 2 and the bottom plate 11 and prevent the oil 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 approximately the same as that of the positioning strip 111, so as to eliminate the fitting gap between the two.

[0050] A limiting relationship is also generated between the top plate of the oil tank 2 and the box cover 22 through a positioning component. Two or more positioning pins are fixedly installed on the upper end surface of the box cover 22 of the oil tank 2. 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 direction of the plate surface of the top plate 12. A fill hole 232 for filling insulating oil (see Figure 5 ) that can be opened and closed is also provided on the box cover 22. A valve can be installed at the fill hole 232 to control the opening and closing of the fill hole 232.

[0051] 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 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 14 surrounds a part of the outer edge of the top plate 12, and the lower edge of the rear enclosure 14 surrounds a part of the outer edge of the bottom plate 11. Screw holes are provided on the outer edges of the top plate 12 and the bottom plate 11, and through holes are provided at the upper and lower ports of the rear enclosure 14. After the rear enclosure 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 fixedly connect the top plate 12, the bottom plate 11, and the rear enclosure 14 into one body.

[0052] In order to improve the heat dissipation uniformity of the fuel tank 2 during operation, during design, the distances between the three surfaces of the installed fuel tank 2 corresponding to the three surfaces of the rear enclosure 14 can be made approximately the same, so as to form a sandwich structure and evenly disperse the heat in the sandwich.

[0053] The front enclosure 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 parallelepiped 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. Screw 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 screw 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 screw holes to fix the side plates 132 and the end plate 131 to each other, thereby forming a U-shaped plate.

[0054] The front enclosure 13 can also be formed by an integral fixed connection method, that is, the two side plates 132 and one end plate 131 are connected together by welding to form an inseparable U-shaped plate.

[0055] The front enclosure 13 is used to wrap the fuel tank 2 from the front of the fuel tank 2, and the front enclosure 13 is fixed to the bottom plate 11 and the top plate 12 by bolts. The front enclosure 13, the rear enclosure 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.

[0056] An installation space for installing electronic devices is formed between the front end face of the fuel tank 2 and the front enclosure 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 external 24V DC power supply. The voltage doubling 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.

[0057] Since there are multiple electronic devices arranged inside the installation space, the heat generation is relatively 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 into the installation space for heat dissipation 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 plate 132 (see Figure 10 ), 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. The ray device in this embodiment communicates with the outside through RS232, and the working parameters of the X-ray generator are controlled through the control device, so as to control the operation of the X-ray generator. 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.

[0058] 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 the air 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.

[0059] Refer to Figure 6 , a support frame is also provided in the installation space in the accommodation cavity. The support frame is supported and connected to the bottom plate 11, and divides the installation space 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 are arranged side by side at intervals. See Figure 10 and Figure 11 , a plurality of convection holes 1321 are provided on the front apron 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.

[0060] Figure 6 In the shown embodiment, on the one hand, the support frame can play a role in fixing and supporting the devices, 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 generator.

[0061] 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. By means of forced air cooling, the fuel tank 2 and the inductor 46 and the high-frequency transformer 45 outside the fuel tank 2 can be cooled more quickly to prevent overheating, thereby prolonging the service life of the equipment and improving the operation stability. Exemplarily, the insulating oil is transformer oil.

[0062] 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 completely open the fuel tank 2, thus saving maintenance time and cost. 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, enable the X-ray generator to operate stably for a long time, and further ensure 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.

[0063] 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 (see Figure 2 ) opened on the inner end surface of the tank cover 22. 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.

[0064] In this embodiment, the lower end of the mounting pillar 3 is supported and connected to the first insulating housing 8, which can save installation 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.

[0065] See Figure 3 , 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 installed on the fixing plate 32 in sequence from top to bottom. A first insulating housing 8 (see Figure 1 and Figure 2 ) is installed at the inner bottom of the fuel tank 2. 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 (see Figure 1 and Figure 3 ) communicating with the inside of the box body 21 at both ends along the width direction of the fuel tank 2, for insulating oil to flow in and fill the inside of the first insulating housing 8.

[0066] 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 1 ), and a guiding hole is provided in the positioning lugs 91.

[0067] A central hole 71 is coaxially penetrated through a adapter 7 with a two-stage stepped shape that is smaller at the top and larger at the bottom, and an external thread is coaxially provided on the outer cylindrical surface of the small-diameter end of the adapter 7. An internal threaded hole is coaxially penetrated through 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.

[0068] Refer to Figures 1 to 3 and Figures 7 to 9 , 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 (central hole 71), and the opening of the socket hole is vertically upward. The electrical connector is configured as a pluggable 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.

[0069] 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.

[0070] 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 deform when subjected to pressure and return to its original state after the pressure disappears.

[0071] 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.

[0072] 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.

[0073] Reference Figure 9 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 1 , 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.

[0074] 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 1 ), 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 generator. The first insulating housing 8 and the second insulating housing 9 can be two independent components.

[0075] 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 (reference Figure 4 ). Through holes for wires to pass through (not shown in the figure) are opened on both the first insulating housing 8 and the second insulating housing 9. The wires pass through the two through holes to electrically connect the filtering device 43 and the spark suppression and current limiting device 44.

[0076] Continue to refer to Figure 4 , a current-carrying gap 93 is opened on the voltage equalizing ring 92 (see Figure 1) and the second connection hole 921 inside the box body 21, so that the insulating oil enters from the second connection hole 921, passes through the overcurrent gap 93 and flows into the inside of the second insulating housing 9 to immerse the spark-limiting current device 44.

[0077] In this embodiment, by introducing the combination of the banana plug 6 and the crown spring 72, the 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 equipment. 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 close contact method ensures the 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.

[0078] A wire is used to connect the high-voltage circuit component 4 and the cathode 52. 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.

[0079] 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. 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, combined with the closing 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.

[0080] The most direct function of the first insulating housing 8 and the second insulating housing 9 is to provide electrical insulation, preventing the filter device 43 and the spark-limiting current 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.

[0081] When the X-ray device is working, it may generate electromagnetic radiation and electromagnetic interference, and these interferences may affect the normal operation of the filter device 43 and the spark-limiting current device 44. The existence of the insulating housing can isolate these electromagnetic interferences to a certain extent and protect the equipment from their influence.

[0082] 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 device's resistance to impact, vibration, etc. to a certain extent, enhancing the overall safety and reliability of the device.

[0083] See Figure 1 、 Figure 2 and Figure 7 , the X-ray tube 5 used in the present utility model is in an L shape. 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.

[0084] See Figure 1 、 Figure 2 and Figure 5 , at the position where the top plate 12 and the tank cover 22 are fitted, a plug hole 231 is provided. The X-ray tube 5 is inserted into the plug hole 231, the anode 51 extends into the cavity of the fuel tank, and a banana plug 6 is installed at the wiring terminal of the anode 51. The banana plug 6 is electrically connected to the anode of the X-ray tube. The banana plug is used to further achieve the plugging and matching with the crown spring 72.

[0085] 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 plug hole 231 to prevent oil leakage from the plug hole 231.

[0086] Refer to Figures 7 to 9 , a mounting screw hole 511 is coaxially provided at the wiring terminal of the anode 51, and an external thread is coaxially provided at the tail end of the banana plug 6 to form a threaded rod 61. The banana plug 6 is fixed to the anode 51 by means of threaded connection. Then when installing the X-ray tube 5, the spring piece end 62 of the banana plug 6 is inserted into the crown spring 72 to electrically connect the arc-striking current-limiting device 44 and the X-ray tube 5.

[0087] See Figure 2 and Figure 9 , a breather 10 is also hermetically provided on the box body 21 of the fuel tank 2, which can absorb the expanded volume of the insulating oil in the fuel tank 2 after heating through elastic deformation.

[0088] The arc-striking current-limiting device 44 plays a crucial role in the electrical system. By restricting the magnitude of the current, it protects the equipment from damage, improves the stability and safety of the system, and meets the requirements of different application scenarios. During the process of inserting the banana plug 6 into the crown spring 72 to achieve electrical connection, the firmness and reliability of the connection should be ensured to avoid electrical failures or safety problems caused by poor contact.

[0089] The utility model is a microfocus 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 microfocus X-ray tube 5 are made equipotential, and used to realize the output of microfocus X-rays. The microfocus X-rays of the microfocus X-ray device are generated by the microfocus X-ray tube 5. For the microfocus X-ray tube 5 to work effectively, anode high voltage, cathode, grid suspended (potential suspension) above the cathode, and hot filament power supply need to be provided. The hot filament heats active electrons, the cathode and 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 microfocus X-rays.

[0090] 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 up the voltage 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.

[0091] Inversion process:

[0092] 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 achieved 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.

[0093] Voltage step-up process:

[0094] The high-frequency AC signal is then sent to the high-frequency transformer 45 for voltage 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 voltage step-up process more compact and efficient.

[0095] Rectification process:

[0096] The boosted high-voltage AC signal is sent to the voltage multiplier rectifier device 41 for rectification. Voltage multiplication rectification is a technology that uses components such as capacitors and diodes to convert AC voltage into DC voltage and at the same time achieve voltage multiplication. Through multiple-stage voltage multiplication 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.

[0097] Filtering process:

[0098] 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.

[0099] Arcing current-limiting device 44:

[0100] Before connecting the anode 51 of the X-ray tube 5, an arcing 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 shocks 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.

[0101] Connection of the anode 51 of the X-ray tube 5:

[0102] The stable DC high voltage after the above treatment 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.

[0103] 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 efficient work of the X-ray tube 5 are ensured.

[0104] The above is only the preferred specific implementation manner 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 and the inventive concept of the present utility model, makes equivalent substitutions or changes, and all should be covered within the protection scope of the present utility model.

Claims

1. A miniaturized X-ray generator, characterized in that, It includes an oil tank (2) filled with insulating oil, an X-ray tube (5) hermetically installed in the oil tank (2) and used for generating X-rays, and a high-voltage circuit component (4) for supplying power to the X-ray tube (5); an insulating housing is arranged in the oil tank (2), and at least part of the electronic devices constituting the high-voltage circuit component (4) are located inside the insulating housing, and a connection hole is opened on the insulating housing for insulating oil to enter and fill the cavity of the insulating housing.

2. The miniaturized X-ray generator according to claim 1, characterized in that, The high-voltage circuit component (4) includes a filtering device (43) and a spark-limiting current-limiting device (44) installed in the oil tank (2); the spark-limiting current-limiting device (44) is electrically connected to the anode (51) of the X-ray tube (5) and the filtering device (43); The insulating housing includes a first insulating housing and a second insulating housing. The filtering device (43) is installed in the first insulating housing (8), and the spark-limiting current-limiting device (44) is installed in the second insulating housing (9); Among them, the first insulating housing (8) is provided with a first connection hole (81) for insulating oil to enter the inside of the first insulating housing (8), and the second insulating housing (9) is provided with a second connection hole (921) for insulating oil to enter the inside of the second insulating housing (9).

3. The miniaturized X-ray generator according to claim 2, characterized in that, A cavity with both ends open is formed inside the second insulating housing (9), and the spark-limiting current-limiting device (44) is fixedly installed in the second insulating housing (9); the bottom end of the second insulating housing (9) abuts against the first insulating housing (8) to close the opening at the bottom of the cavity; The wiring terminal of the anode (51) of the X-ray tube (5) extends into the cavity from the opening at the top of the cavity and is electrically connected to the wiring terminal of the spark-limiting current-limiting device (44).

4. A miniaturized X-ray generator according to claim 3, characterized in that, A grading ring (92) is installed between the wiring terminal of the anode (51) of the X-ray tube (5) and the wiring terminal of the spark-limiting current-limiting device (44), and the second connection hole (921) connecting the internal cavity of the second insulating housing (9) and the inside of the box body (21) is opened on the grading ring (92).

5. The miniaturized X-ray generator according to claim 4, wherein There are multiple second connection holes (921), and the multiple second connection holes (921) are evenly distributed on the ring surface of the grading ring (92) along the circumferential direction of the grading ring (92).

6. A miniaturized X-ray generator according to any one of claims 2 to 5, characterized in that An insulating fixing plate (32) is fixedly installed in the oil tank (2). The electronic devices constituting the high-voltage circuit component (4) include a voltage multiplier rectifying device (41) and a sampling device (42) installed in the oil tank (2) and electrically connected to each other. The voltage multiplier rectifying device (41) is electrically connected to the filtering device (43); The voltage multiplier rectifying device (41) and the sampling device (42) are respectively fixedly installed on both sides of the fixing plate (32).

7. The miniaturized X-ray generator according to claim 6, characterized in that, The high-voltage circuit component (4) further includes a high-frequency transformer (45) installed outside the oil tank (2) and used for connecting to an external power supply and boosting the external power supply; the high-frequency transformer (45) is electrically connected to the voltage multiplier rectifying device (41) and the cathode (52) of the X-ray tube (5).

8. A miniaturized X-ray generator according to claim 7, characterized in that, A fan (13111) for heat dissipation is installed outside the oil tank (2) near the high-frequency transformer (45), and the high-frequency transformer (45) is located on the air flow path of the fan (13111).

9. A miniaturized X-ray generator according to any one of claims 1 to 5, characterized in that, The fuel tank (2) includes a tank body (21) and a tank cover (22) hermetically closed on the tank body (21); a plug hole (231) is formed in the tank cover (22), and the anode (51) of the X-ray tube (5) passes through the plug hole (231) and immerses into the fuel tank (2), the cathode (52) of the X-ray tube (5) is fixedly installed on the tank cover (22), and the X-ray tube (5) and the plug hole (231) are hermetically fitted with each other; When the tank cover (22) is closed and connected to the tank body (21), the anode (51) of the X-ray tube (5) is located vertically above the insulating housing.

10. A miniaturized X-ray generator according to claim 9, characterized in that, The tank body (21) of the fuel tank (2) is a tank body (21) made of insulating material, and a metal material layer is covered on the outer surface of the tank body (21); and / or the tank cover (22) is a tank cover (22) made of conductive material.

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