CN214070221U

CN214070221U - 1MV pulse type portable X-ray machine

Info

Publication number: CN214070221U
Application number: CN202120151580.XU
Authority: CN
Inventors: 杨周磊; 顾德恩; 付泽林; 陈攀; 张宝根; 杨定鑫; 向兵; 杨树海
Original assignee: Sichuan Gesra Technology Co ltd
Current assignee: Sichuan Gesra Technology Co ltd
Priority date: 2021-01-20
Filing date: 2021-01-20
Publication date: 2021-08-27
Anticipated expiration: 2031-01-20

Abstract

The utility model discloses a 1MV pulse type portable X-ray machine, which comprises an energy generating cylinder bracket, an induction cavity cylinder bracket, an energy generating cylinder and an induction cavity cylinder; the top end of the energy generation cylinder support is fixedly connected with the outer wall of the energy generation cylinder, and the top end of the induction cavity cylinder support is fixedly connected with the bottom surface of the induction cavity cylinder; openings are formed in two sides of the energy generating cylinder, the energy generating cylinder is provided with a rear cover plate, and the rear cover plate is connected with one side of the energy generating cylinder in a sealing mode through a flange; the pulse power system has the characteristics of small volume, fast pulse leading edge and narrow pulse width, can well meet the requirement of high-power load in the pulse power system, and achieves the miniaturization design of the pulse power system.

Description

1MV pulse type portable X-ray machine

Technical Field

The utility model relates to a strong laser and particle beam technique, concretely relates to portable X-ray machine of 1MV pulsed.

Background

At present, because the X-ray has the characteristic of attenuating according to a certain rule when penetrating through a substance, the X-ray is widely applied to the fields of weapons and medicine. The pulsed X-ray is suitable for observing and studying high-speed motion phenomena with transient characteristics. Therefore, the flash photography test technology plays an important role in some scientific research fields and national defense construction. Narrow X-ray pulse and small focal spot, make the object moving at a high speed can obtain the clear picture of edge; proper energy and irradiation quantity, and enough penetration capacity, so that the image receiving system obtains normal exposure; precise synchronous timing control to ensure that a physical image is taken at any particular moment in time during a high speed transient. The pulse X-ray machine can provide pulse X-rays with short time and high intensity, and is an ideal light source for realizing high-speed radiation photography. A Marx generator is an important circuit structure used in pulse power technology to obtain high voltage pulses with amplitudes from hundreds kV to MV and durations from tens ns to μ s. The traditional Marx generator is large in size, slow in output pulse leading edge and large in pulse width, and generally cannot be directly used for driving a high-power load. In recent years, with the progress of a switching technology and a high-voltage pulse capacitor technology, a mini-Marx generator is rapidly developed, and the Marx generator can well meet the requirement of a high-power load in a pulse power system due to the characteristics of small size, fast pulse front edge and narrow pulse width, so that the miniaturization design of the pulse power system is achieved.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that traditional Marx generator is bulky, go out pulse forward position relatively slow and the great problem of pulse width, aim at provides a portable X-ray machine of 1MV pulsed, its small in size, pulse forward position are fast, the characteristics of pulse width are narrow, can satisfy the needs of the high power load in the pulse power system well, reach the miniaturized design of pulse power system.

The utility model discloses a following technical scheme realizes:

a 1MV pulsed portable X-ray machine comprising: the energy generation device comprises an energy generation cylinder bracket, an induction cavity cylinder bracket, an energy generation cylinder and an induction cavity cylinder; the top end of the energy generation cylinder support is fixedly connected with the outer wall of the energy generation cylinder, and the top end of the induction cavity cylinder support is fixedly connected with the bottom surface of the induction cavity cylinder; openings are formed in two sides of the energy generating cylinder, the energy generating cylinder is provided with a rear cover plate, and the rear cover plate is connected with one side of the energy generating cylinder in a sealing mode through a flange;

the induction cavity cylinder is provided with a cylinder bottom side plate, the diameter of the hole A is matched with the inner diameter of the energy generation cylinder, the other side of the energy generation cylinder is hermetically connected with the cylinder bottom side of the induction cavity cylinder through a flange, insulation technology and circuit optimization factors are important for a compact pulse power supply, insulation can be enhanced by a method of filling compressed gas, and the volume of the power supply is effectively reduced; the circuit optimization can effectively reduce the system inductance and the establishment time, and achieve a faster pulse front edge, the design of the fast Marx generator requires that the series inductance of a loop is as small as possible, and the Marx generator selects a low-inductance ceramic capacitor as an energy storage element; the high-voltage lead is as short as possible, and a wide copper strip is adopted as a switch lead; the gap of a high-pressure gas switch is generally small, the withstand voltage of the switch is improved by filling gas with higher pressure, so that the loop inductance is reduced, the overvoltage coupling efficiency between the switches is improved by reasonably utilizing the grounding distributed capacitance of each stage of switch electrode in the design of the Marx generator, the high-pressure gas switches are arranged in a row, a front stage switch is conducted to generate strong ultraviolet light to pre-ionize the next stage of spark switch, so that the discharge process is accelerated, the establishment of the establishing process of the Marx generator is easy, and finally the establishment of a fast front edge pulse waveform is realized, and an energy storage capacitor, a charging resistor, each stage of gas switch and a lead wire are all packaged in a metal cylinder to form a coaxial structure; the coaxial structure can reduce the loop inductance to a great extent, and is favorable for improving the compactness of the device.

Further, the energy generation device comprises a vacuum outer barrel, wherein the vacuum outer barrel is provided with an opening, the opening side of the vacuum outer barrel is connected with the top side of the induction cavity barrel in a sealing mode through a flange, and an insulating layer is arranged on the inner wall of the energy generation barrel.

Further, a Marx generator is arranged in the energy generating cylinder, a corrugated pipe is installed on one side, far away from the rear cover plate, of the Marx generator, the Marx generator is of a 12-stage unipolar coaxial structure, the output of high-voltage pulses is sharpened by using structural capacitance between a switch and a shielding outer cylinder, meanwhile, the output of narrow pulses is obtained by adopting a compact and low-inductance design, spark switches are arranged in a row, and the strong ultraviolet light of a front-stage switch is used for pre-ionizing the next-stage spark switch so as to achieve reliable operation.

Furthermore, a corrugated pipe base, a bottom plate, an inner electrode rod, a cathode rod assembly, an induction cavity and an induction cavity inner barrel are arranged in the induction cavity barrel; the utility model discloses a set up the bottom plate of response chamber inner tube, including the bottom plate, the back axle center position fixed connection bellows base of bottom plate, bellows base upper end fixed connection bellows, the axle center position department of bottom plate sets up fluted A, the recess A department that the axle center position of bottom plate was seted up is installed to the inner electrode pole, the bottom plate is close to response intracavity section of thick bamboo side department and sets up fluted B, the one end in FXR response chamber is installed and is close to the recess B department that response intracavity section of thick bamboo side department set up at the bottom plate, the other end in FXR response chamber is installed on the inner wall of the section of thick bamboo top side board of response chamber section of thick bamboo, the front end fixed mounting cathode bar subassembly of inner electrode pole.

The induction cavity cylinder is characterized by further comprising a cathode disc, a cylinder top side plate of the induction cavity cylinder is provided with a hole B along the axis position, the diameter of the hole B is slightly smaller than that of the cathode disc, the cathode disc is fixedly connected to the outer wall of the cylinder top side plate of the induction cavity cylinder, and the cathode disc and the hole B share one axis.

Further, a hole C is formed in the axis position of the cathode disc, the inner diameter of the hole C is slightly larger than the outer diameter of the top end of the cathode rod assembly, and the top end of the cathode rod assembly penetrates through the hole C formed in the cathode disc.

Compared with the prior art, the utility model, following advantage and beneficial effect have:

the utility model relates to a portable X-ray machine of 1MV pulsed, adopt the line design of Marx generator direct drive X-ray tube, the Marx generator circuit of 12 grades of unipolar coaxial structures has been chooseed for use, the output that utilizes structure electric capacity between switch and shielding urceolus to sharpen high-voltage pulse, adopt the compactness simultaneously, the low inductance design obtains the output of narrow pulse, arrange one row with spark switch, thereby borrow the strong ultraviolet ray of preceding stage switch and reach reliable operation with one-level spark switch under the preionization, Marx generator is because of small in size, the pulse front edge is fast, the characteristics of pulse width is narrow, can satisfy the needs of pulse power system high power load well, reach the miniaturized design of pulse power system.

Drawings

The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:

fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a partial enlarged view of the present invention.

Reference numbers and corresponding part names in the drawings:

1-energy generating cylinder support; 2-induction cavity cylinder bracket; 3-an energy generation cylinder; 4-an induction cavity cylinder; 5-a rear cover plate; 6-vacuum outer barrel; 7-Marx generator; 8-a bellows; 9-a bellows base; 10-a base plate; 11-inner electrode rod; 12-a cathode rod assembly; 13-FXR sensing chamber; 14-induction chamber inner cylinder; 15-a cathode disk; 16-insulating layer.

Detailed Description

To make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the following examples and drawings, and the exemplary embodiments and descriptions thereof of the present invention are only used for explaining the present invention, and are not intended as limitations of the present invention.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. However, it will be apparent to one of ordinary skill in the art that: it is not necessary to employ these specific details to practice the present invention. In other instances, well-known structures, circuits, materials, or methods have not been described in detail so as not to obscure the present invention.

Throughout the specification, reference to "one embodiment," "an embodiment," "one example," or "an example" means: the particular features, structures, or characteristics described in connection with the embodiment or example are included in at least one embodiment of the invention. Thus, the appearances of the phrases "one embodiment," "an embodiment," "one example" or "an example" in various places throughout this specification are not necessarily all referring to the same embodiment or example. Furthermore, the particular features, structures, or characteristics may be combined in any suitable combination and/or sub-combination in one or more embodiments or examples. Further, those of ordinary skill in the art will appreciate that the illustrations provided herein are for illustrative purposes and are not necessarily drawn to scale. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

In the description of the present invention, the terms "front", "back", "left", "right", "up", "down", "vertical", "horizontal", "high", "low", "inner", "outer", etc. indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the scope of the present invention.

Examples

As shown in fig. 1, the utility model relates to a portable X-ray machine of 1MV pulsed, include: the device comprises an energy generation cylinder bracket 1, an induction cavity cylinder bracket 2, an energy generation cylinder 3 and an induction cavity cylinder 4; the top end of the energy generating cylinder bracket 1 is fixedly connected with the outer wall of the energy generating cylinder 3, and the top end of the induction cavity cylinder bracket 2 is fixedly connected with the bottom surface of the induction cavity cylinder 4; said energy source generating

Openings are formed in two sides of the cylinder 3, the energy generating cylinder is provided with a rear cover plate 5, and the rear cover plate 5 is in sealing connection with one side of the energy generating cylinder 3 through a flange; the induction cavity barrel 4 is provided with a hole A on a barrel bottom side plate, the diameter of the hole A is matched with the inner diameter of the energy generation barrel 3, and the other side of the energy generation barrel 3 is hermetically connected with the barrel bottom side of the induction cavity barrel 4 through a flange.

Furthermore, the insulation technology and the circuit optimization factor are important for the compact pulse power supply, the insulation can be enhanced by adopting a method of filling compressed gas, and the size of the power supply is effectively reduced; the circuit optimization can effectively reduce the system inductance and the establishment time, a faster pulse front edge is achieved, the Marx generator 7 requires that the series inductance of a loop is as small as possible, and the Marx generator 7 selects a low-inductance ceramic capacitor as an energy storage element; the high-voltage lead is as short as possible, and a wide copper strip is adopted as a switch lead; the gap of a high-pressure gas switch is generally small, the withstand voltage of the switch is improved by filling gas with higher pressure, so that the loop inductance is reduced, the overvoltage coupling efficiency between the switches is improved by reasonably utilizing the ground distributed capacitance of each stage of switch electrode in the design of the Marx generator, the high-pressure gas switches are arranged in a row, a front stage switch is conducted to generate strong ultraviolet light to pre-ionize a next stage of spark switch, so that the discharge process is accelerated, the establishment of the erecting process of the Marx generator 7 is easy to establish, the establishment of a fast front edge pulse waveform is finally realized, and an energy storage capacitor, a charging resistor, each stage of gas switch and a lead wire are all packaged in a metal cylinder to form a coaxial structure; the coaxial structure can reduce the loop inductance to a great extent, and is favorable for improving the compactness of the device.

Further, the energy source generation device further comprises a vacuum outer barrel 6, wherein an opening is formed in the vacuum outer barrel 6, the opening side of the vacuum outer barrel 6 is connected with the barrel top side of the induction cavity barrel 4 in a sealing mode through a flange, and an insulating layer 16 is arranged on the inner wall of the energy source generation barrel 3. The energy source generating device is characterized in that a Marx generator 7 is arranged in the energy source generating tube 3, a corrugated tube 8 is installed on one side, far away from the rear cover plate 5, of the Marx generator 7, and the Marx generator 7 is of a 12-stage unipolar coaxial structure.

Furthermore, a corrugated pipe base 9, a bottom plate 10, an inner electrode rod 11, a cathode rod assembly 12, an FXR induction cavity 13 and an induction cavity inner barrel 14 are arranged in the induction cavity barrel 4; one side fixed connection bottom plate 10 of response chamber inner tube 14, the back axle center position fixed connection bellows base 9 of bottom plate 10, bellows base 9 upper end fixed connection bellows 8, the axle center position department of bottom plate 10 sets up fluted A, the recess A department of setting up in the axle center position of bottom plate 10 is installed to inner electrode pole 11, bottom plate 10 is close to response chamber inner tube 14 side department and sets up fluted B, the recess B department of setting up in the bottom plate 10 is close to response chamber inner tube 14 side department is installed to the one end in FXR response chamber 13, the other end in FXR response chamber 13 is installed on the inner wall of the bobbin deck curb plate of response chamber section of thick bamboo 4, the front end fixed mounting cathode bar subassembly 12 of inner electrode pole 11.

Further, still include the negative pole dish 15, the bobbin top curb plate of induction chamber section of thick bamboo 4 is seted up hole B along the axle center position, the diameter of hole B slightly is less than the diameter of negative pole dish 15, negative pole dish 15 fixed connection just negative pole dish 15 and the public an axis of hole B on the outer wall of the bobbin top curb plate of induction chamber section of thick bamboo 4, hole C is seted up to the axle center position of negative pole dish 15, the internal diameter of hole C slightly is greater than the external diameter at negative pole subassembly 12 top. It will be appreciated that a large dose output is obtained at a low energy while requiring a small X-ray focal spot, which is a technical difficulty in X-ray tube design. The cold cathode vacuum X-ray diode generally adopts a conical tungsten needle as an anode and a circular ring steel sheet as a cathode to be arranged in a vacuum chamber to form the reflecting target vacuum X-ray diode. The focal spot and dose size of the X-ray tube are directly related to the diameter of the anode, the smaller the anode diameter, the smaller the X-ray focal spot and the smaller the dose. The cold cathode has sharp corners or tips to facilitate the establishment of field emission currents; the anode is designed to maximize the intensity of the X-rays as much as possible given the size of the focal spot. Generally, the double-cathode X-ray tube has a single-cathode structure and a multi-cathode structure, the multi-cathode structure enables current to be distributed more uniformly on the whole surface of an anode cone, the service life of an anode is prolonged, the size of the X-ray tube is reduced, the X-ray tube is convenient to move and carry, and the high-vacuum X-ray tube is designed by adopting a double-cathode sealed-off type X-ray tube structure and ceramic packaging.

It can be understood that a high-energy compact portable X-ray machine is designed by adopting a Marx generator 7 circuit, the line design of the Marx generator for directly driving an X-ray tube is adopted, a 12-stage unipolar coaxial-structure Marx generator line is selected, the output of high-voltage pulses is sharpened by using a structural capacitor between a switch and a shielding outer cylinder, and the output of narrow pulses is obtained by adopting a compact low-inductance design. The spark switches are arranged in a row, and strong ultraviolet light of the front stage switch is used for pre-ionizing the next stage spark switch so as to achieve reliable operation. The maximum energy storage of the Marx generator is 180J, and high-voltage pulses with the leading edge of 15nS, the pulse width of 100nS and the amplitude of 1080kV are obtained on a 75 omega load under the condition that the charging voltage is 90 kV. The experimental result shows that the design is reasonable, and the main parameters of the developed X-ray machine are 100ns of pulse width; dose at 0.3m is about 4.58x10^-5C/kg, focal spot 2 mm; the X-ray machine can be used in the research fields of fluid dynamics tests and the like, and can also be applied to the transient process research of industrial nondestructive testing, plasma physics, material science, biology and medicine.

The above-mentioned embodiments, further detailed description of the objects, technical solutions and advantages of the present invention, it should be understood that the above description is only the embodiments of the present invention, and is not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims

1. A 1MV pulsed portable X-ray machine comprising: the device comprises an energy generation cylinder bracket (1) and an induction cavity cylinder bracket (2), and is characterized by also comprising an energy generation cylinder (3) and an induction cavity cylinder (4); the top end of the energy generating cylinder support (1) is fixedly connected with the outer wall of the energy generating cylinder (3), and the top end of the induction cavity cylinder support (2) is fixedly connected with the bottom surface of the induction cavity cylinder (4); openings are formed in two sides of the energy generating cylinder (3), the energy generating cylinder is provided with a rear cover plate (5), and the rear cover plate (5) is in sealing connection with one side of the energy generating cylinder (3) through a flange;

the induction cavity barrel (4) is characterized in that a barrel bottom side plate of the induction cavity barrel (4) is provided with a hole A, the diameter of the hole A is matched with the inner diameter of the energy generation barrel (3), and the other side of the energy generation barrel (3) is connected with the barrel bottom side of the induction cavity barrel (4) in a sealing mode through a flange.

2. The 1MV pulse type portable X-ray machine according to claim 1, further comprising a vacuum outer barrel (6), wherein the vacuum outer barrel (6) is provided with an opening, and the opening side of the vacuum outer barrel (6) and the top side of the induction cavity barrel (4) are hermetically connected through a flange.

3. A 1MV pulsed portable X-ray machine according to claim 1, characterized in that the inner wall of the energy generating drum (3) is provided with an insulating layer (16).

4. A 1MV pulse type portable X-ray machine according to claim 3, characterized in that the energy source generating cylinder (3) is provided with a Marx generator (7), the side of the Marx generator (7) far from the back cover plate (5) is provided with a corrugated pipe (8), and the Marx generator (7) is set to 12-stage unipolar coaxial structure.

5. The 1MV pulse type portable X-ray machine according to claim 1, wherein a corrugated pipe base (9), a bottom plate (10), an inner electrode rod (11), a cathode rod assembly (12), an FXR induction cavity (13) and an induction cavity inner cylinder (14) are arranged in the induction cavity cylinder (4); one side fixed connection bottom plate (10) of response chamber inner tube (14), back axle center position fixed connection bellows base (9) of bottom plate (10), bellows base (9) upper end fixed connection bellows (8), the axle center position department of bottom plate (10) sets up fluted A, the recess A department of setting up in the axle center position of bottom plate (10) is installed to inner electrode pole (11), bottom plate (10) are close to response chamber inner tube (14) side department and set up fluted B, the recess B department of setting up in bottom plate (10) near response chamber inner tube (14) side department is installed to the one end of FXR response chamber (13), the other end of FXR response chamber (13) is installed on the inner wall of the section of thick bamboo top side board of response chamber section of thick bamboo (4), the front end fixed mounting negative pole subassembly (12) of inner electrode pole (11).

6. The 1MV pulse type portable X-ray machine according to claim 5, further comprising a cathode disk (15), wherein a hole B is formed in a top side plate of the induction chamber cylinder (4) along an axial position, the diameter of the hole B is slightly smaller than that of the cathode disk (15), the cathode disk (15) is fixedly connected to an outer wall of the top side plate of the induction chamber cylinder (4), and the cathode disk (15) and the hole B share one axis.

7. The 1MV pulse type portable X-ray machine according to claim 6, wherein a hole C is formed in the axial position of the cathode disk (15), and the inner diameter of the hole C is larger than the outer diameter of the top end of the cathode rod assembly (12).