A repeatable vacuum x-ray tube

Abstract

The utility model discloses a kind of X-ray tubes that can be repeatedly evacuated, it includes glass shell, glass shell one end is provided with cathode assembly, glass shell one end is provided with anode assembly, cathode assembly generates free electron by thermionic emission process, anode assembly absorbs free electron and generates X-ray, glass shell outside is fixedly connected with metal protective shell, metal protective shell bottom is provided with through slot, when needing to be evacuated, one end of anode tube is connected with external vacuum machine, the inside of glass shell is evacuated, connecting rod slides outward under the action of suction, boss separates with second boss, air is sucked by first through hole, after evacuation, because the space between the inside of glass shell and external atmosphere forms a pressure difference, and connecting rod rebounds quickly under the assistance of spring, sealing ring seals first through hole, input insulating oil by oil pipe, then seal inside vacuum by first sealing cover and second sealing cover.

Description

Technical Field

[0001] This utility model relates to the field of X-ray tube technology, specifically to an X-ray tube that can be repeatedly evacuated. Background Technology

[0002] With the rapid development of science and technology, X-ray tubes are playing an increasingly important role in various fields such as medical diagnosis, security inspection, and non-destructive testing. The principle behind X-ray generation in an X-ray tube is as follows: the cathode filament is heated by an electric current, causing electrons to overcome the work function and form an electron cloud on its surface. Under the influence of a strong electric field with a voltage of hundreds of thousands of volts applied between the cathode and anode, the electrons are accelerated towards the anode and collide with the target surface, generating X-rays. During operation, the temperature at the impact point on the anode target disk can reach 2600°C-2700°C, and this heat dissipates into the insulating oil inside the X-ray tube, causing the oil temperature to rise.

[0003] Most existing X-ray tubes require re-vacuuming when the vacuum level is found to be substandard. For X-ray tubes that have already been sealed, re-vacuuming requires removing the original sealing device and re-welding it, which is a complicated process. Furthermore, the disassembly and removal of the sealing device can easily introduce contaminants, which reduces processing efficiency to some extent. Utility Model Content

[0004] The purpose of this section is to outline some aspects of the embodiments of this utility model and to briefly introduce some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be used to limit the scope of this utility model.

[0005] In view of the problems mentioned above and / or existing re-vacuum-expanding X-ray tubes, this utility model is proposed.

[0006] Therefore, the purpose of this invention is to provide a reusable vacuum X-ray tube. When vacuuming is required during use, one end of the anode tube is connected to an external vacuum machine to evacuate the inside of the glass shell. Under suction, the connecting rod slides outward, separating the first and second protrusions. Air is drawn away through the first through-hole. After vacuuming, a pressure difference is created between the internal space of the glass shell and the external atmosphere. With the assistance of a spring, the connecting rod quickly rebounds, sealing the first through-hole. Insulating oil is introduced through the oil pipe, and then the internal vacuum is sealed through the first and second sealing caps, simultaneously preventing leakage of insulating oil. When the tungsten filament is energized, it heats up, generating free electrons that form space charges. The target absorbs free electrons and generates X-rays. A metal protective shell shields the glass outer shell, and the X-rays are emitted through a through-slot. The power plug energizes the electromagnetic coil, which is activated to generate a rotating magnetic field that drives the target to rotate. This diffuses the electrons emitted by the tungsten filament to a larger area, significantly increasing the heat capacity of the X-ray tube. This solves the problem that most existing X-ray tubes require re-vacuuming when the vacuum level is found to be substandard. For X-ray tubes that have already been sealed, re-vacuuming requires removing the original sealing device and re-welding it, which is a complex process. Furthermore, the disassembly and removal of the sealing device can easily introduce contaminants, reducing processing efficiency to some extent.

[0007] To solve the above-mentioned technical problems, according to one aspect of the present invention, the present invention provides the following technical solution:

[0008] A reusable vacuum-evacuated X-ray tube includes a glass shell, a cathode assembly at one end of the glass shell, and an anode assembly at the other end of the glass shell. The cathode assembly generates free electrons through thermionic emission, and the anode assembly absorbs the free electrons and generates X-rays. A metal protective shell is fixedly connected to the outside of the glass shell. A through groove is provided at the bottom of the metal protective shell, and a driving assembly is provided on one side of the metal protective shell. The driving assembly drives the anode assembly to rotate. An oil pipe is provided at one end of the glass shell, and the inside of the glass shell is filled with insulating oil. A first external thread is provided at one end of the oil pipe, and a first sealing cap is threadedly connected to the other end of the oil pipe. The anode assembly includes an anode tube, and a vacuum port is provided at one end of the anode tube. A second external thread is provided on the outside of the vacuum port, and a second sealing cap is threadedly connected to the outside of the vacuum port. A check valve assembly is provided inside the anode tube, which prevents the insulating oil from leaking out while allowing external air to flow back into the glass shell.

[0009] As a preferred embodiment of the reusable vacuum X-ray tube described in this utility model, the check valve assembly includes a first fixing frame, both ends of which are fixedly connected to the inner wall of the anode tube. A first guide hole is provided in the middle of the first fixing frame, and second guide holes are provided at both ends of the first fixing frame. A connecting rod is movably connected inside the first guide hole.

[0010] In a preferred embodiment of the reusable vacuum X-ray tube of this utility model, a first protrusion is fixedly connected to one end of the connecting rod, a sealing ring is fixedly connected to one side of the first protrusion, guide posts are fixedly connected to both ends of one side of the first protrusion, a first limiting block is fixedly connected to one end of the guide post through a second guide hole, multiple springs are provided between one side of the first protrusion and one side of the first fixing frame, a second protrusion is provided at one end of the anode tube, and a first through hole is provided in the middle of the second protrusion.

[0011] In a preferred embodiment of the reusable vacuum X-ray tube described in this utility model, the cathode assembly includes a cathode tube, and a second through hole is provided at one end of the glass shell, with the cathode tube located inside the second through hole.

[0012] In a preferred embodiment of the reusable vacuum X-ray tube described in this utility model, a second limiting block is provided at one end of the cathode tube, and a third limiting block is provided at one end of the cathode tube. The second limiting block and the third limiting block are respectively located at both ends of the second through hole, and a tungsten wire is fixedly connected inside the cathode tube.

[0013] In a preferred embodiment of the reusable vacuum X-ray tube described in this utility model, a third through hole is provided at one end of the glass shell, and the anode tube is located inside the third through hole.

[0014] In a preferred embodiment of the reusable vacuum X-ray tube of this utility model, a fourth limiting block is provided at one end of the anode tube, a fifth limiting block is provided at one end of the anode tube, the fourth limiting block and the fifth limiting block are respectively located at both ends of the third through hole, and a target block is fixedly connected to one end of the anode tube.

[0015] In a preferred embodiment of the reusable vacuum X-ray tube of this utility model, the metal protective shell is provided with a first limiting groove and a second limiting groove, the glass shell is provided with a plurality of sixth limiting blocks, and a seventh limiting block is fixedly connected between the plurality of sixth limiting blocks. The sixth limiting blocks are located in the first limiting groove, and the seventh limiting block is located in the second limiting groove.

[0016] In a preferred embodiment of the reusable vacuum X-ray tube described in this utility model, the driving assembly includes an electromagnetic coil, a power connector is fixedly connected to one side of the metal protective shell, the power connector is electrically connected to the electromagnetic coil, a permanent magnet is fixedly connected to the outer wall of the anode tube, and the anode tube is located at the center of the electromagnetic coil.

[0017] As a preferred embodiment of the reusable vacuum X-ray tube described in this utility model, one end of the metal protective shell is provided with a plurality of second fixing brackets, and one end of the second fixing bracket is movably connected with screws.

[0018] Compared with the prior art, the beneficial effects of this utility model are as follows: When vacuuming is required, one end of the anode tube is connected to an external vacuum machine to evacuate the inside of the glass shell. Under the action of suction, the connecting rod slides outward, the protrusion and the second protrusion separate, and the air is sucked away through the first through hole. After vacuuming, a pressure difference is formed between the internal space of the glass shell and the external atmosphere, and with the assistance of the spring, the connecting rod quickly rebounds. The sealing ring seals the first through hole, and insulating oil is introduced through the oil pipe. Then, the internal vacuum is sealed through the first sealing cover and the second sealing cover, which also prevents the insulating oil from leaking out. When the tungsten wire is energized, the tungsten wire heats up and generates free electrons to form space charges, which are absorbed by the target block. The X-ray tube generates X-rays from electrons. A metal protective shell shields the glass outer shell, and the X-rays are emitted through a through-slot. The power plug energizes the electromagnetic coil, which is activated to generate a rotating magnetic field that drives the target block to rotate. This diffuses the electrons emitted by the tungsten filament to a larger area, significantly increasing the heat capacity of the X-ray tube. This solves the problem that most existing X-ray tubes require re-vacuuming when the vacuum level is found to be substandard. For X-ray tubes that have already been sealed, re-vacuuming requires removing the original sealing device and re-welding it, which is a complex process. Furthermore, the disassembly and removal of the sealing device can easily introduce contaminants, reducing processing efficiency to some extent. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this utility model, the present utility model will be described in detail below with reference to the accompanying drawings and detailed embodiments. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Among them:

[0020] Figure 1 This is a schematic diagram of the overall structure of an X-ray tube capable of repeated vacuuming according to the present invention.

[0021] Figure 2This is a cross-sectional view of the overall structure of an X-ray tube capable of repeated vacuuming according to this utility model.

[0022] Figure 3 This is a cross-sectional view of the glass shell structure of an X-ray tube capable of repeated vacuuming according to this utility model.

[0023] Figure 4 This is a cross-sectional view of the anode tube structure of an X-ray tube with reusable vacuum according to the present invention.

[0024] Figure 5 This is a schematic diagram of the cathode tube structure of an X-ray tube that can be repeatedly evacuated according to this utility model.

[0025] Figure 6 This is a schematic diagram of the connecting rod structure of an X-ray tube capable of repeated vacuuming according to this utility model.

[0026] Figure 7 This is a cross-sectional view of the metal protective shell structure of an X-ray tube that can be repeatedly evacuated according to this utility model. Detailed Implementation

[0027] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0028] Example

[0029] Please see Figures 1-6 The system comprises a glass shell 1, with a cathode assembly at one end and an anode assembly at the other. The cathode assembly generates free electrons through thermionic emission, and the anode assembly absorbs these free electrons and generates X-rays. A metal protective shell 2 is fixedly connected to the outside of the glass shell 1. A through groove 32 is provided at the bottom of the metal protective shell 2, and a drive assembly is provided on one side of the metal protective shell 2. The drive assembly drives the anode assembly to rotate. An oil pipe 11 is provided at one end of the glass shell 1, and the interior of the glass shell 1 is filled with insulating oil. A first external thread 12 is provided at one end of the oil pipe 11, and a first sealing cap 4 is threadedly connected to the other end of the oil pipe 11. The anode assembly includes an anode tube 7, with a vacuum port at one end. A second external thread 18 is provided on the outside of the vacuum port, and a second sealing cap 3 is threadedly connected to the outside of the vacuum port. A check valve assembly is provided inside the anode tube 7, which prevents the insulating oil from leaking out while allowing external air to flow back into the interior of the glass shell 1.

[0030] The check valve assembly includes a first fixing frame 20, both ends of which are fixedly connected to the inner wall of the anode tube 7. A first guide hole 21 is provided in the middle of the first fixing frame 20, and a second guide hole 22 is provided at both ends of the first fixing frame 20. A connecting rod 8 is movably connected inside the first guide hole 21.

[0031] One end of the connecting rod 8 is fixedly connected to a first protrusion 25. A sealing ring 26 is fixedly connected to one side of the first protrusion 25. Guide posts 27 are fixedly connected to both ends of one side of the first protrusion 25. One end of the guide post 27 passes through the second guide hole 22 and is fixedly connected to a first limiting block 29. Multiple springs 28 are provided between one side of the first protrusion 25 and one side of the first fixing frame 20. A second protrusion is provided at one end of the anode tube 7. A first through hole 19 is provided in the middle of the second protrusion.

[0032] The cathode assembly includes a cathode tube 6, and a second through hole 13 is provided at one end of the glass shell 1, with the cathode tube 6 located inside the second through hole 13.

[0033] A second limiting block 36 is provided at one end of the cathode tube 6, and a third limiting block 23 is provided at the other end of the cathode tube 6. The second limiting block 36 and the third limiting block 23 are located at both ends of the second through hole 13, and a tungsten wire 24 is fixedly connected inside the cathode tube 6.

[0034] A third through hole 14 is provided at one end of the glass shell 1, and the anode tube 7 is located inside the third through hole 14.

[0035] A fourth limiting block 16 is provided at one end of the anode tube 7, and a fifth limiting block 17 is provided at the other end of the anode tube 7. The fourth limiting block 16 and the fifth limiting block 17 are located at both ends of the third through hole 14, and a target block 15 is fixedly connected to one end of the anode tube 7.

[0036] The metal protective shell 2 is provided with a first limiting groove 30 and a second limiting groove 31 inside. The glass shell 1 is provided with a plurality of sixth limiting blocks 9 on the outside. A seventh limiting block 10 is fixedly connected between the plurality of sixth limiting blocks 9. The sixth limiting blocks 9 are located in the first limiting groove 30 and the seventh limiting block 10 is located in the second limiting groove 31.

[0037] The drive assembly includes an electromagnetic coil 33, a power connector 5 is fixedly connected to one side of the metal protective shell 2, the power connector 5 is electrically connected to the electromagnetic coil 33, a permanent magnet is fixedly connected to the outer wall of the anode tube 7, and the anode tube 7 is located at the center of the electromagnetic coil 33.

[0038] The metal protective shell 2 has multiple second fixing brackets 34 at one end, and screws 35 are movably connected to one end of each second fixing bracket 34.

[0039] Specifically, when vacuuming is required, one end of the anode tube 7 is connected to an external vacuum machine to evacuate the inside of the glass shell 1. The connecting rod 8 slides outward under the suction force, and the protrusion 25 separates from the second protrusion. Air is sucked away through the first through hole 19. After vacuuming, a pressure difference is formed between the internal space of the glass shell 1 and the external atmosphere. With the assistance of the spring 28, the connecting rod 8 quickly rebounds, and the sealing ring 26 seals the first through hole 19. Insulating oil is introduced through the oil pipe 11, and then the internal vacuum is sealed through the first sealing cover 4 and the second sealing cover 3, which also prevents the insulating oil from leaking out. The tungsten wire 24 is energized, and the tungsten wire 24 heats up and generates free electrons to form space charges. The target block 15 absorbs the free electrons. X-rays are generated, and the metal protective shell 2 shields and protects the glass shell 1. The X-rays are emitted through the through slot 32. The power plug 5 energizes the electromagnetic coil 33, which is activated to generate a rotating magnetic field that drives the target block 15 to rotate. This diffuses the electrons emitted by the tungsten wire 24 to a larger area, significantly increasing the heat capacity of the X-ray tube. This solves the problem that most existing X-ray tubes need to be re-vacuumed when the vacuum level is found to be unqualified. For X-ray tubes that have already been sealed, re-vacuuming requires removing the original sealing device and re-welding the sealing device, which is a complicated process. Furthermore, the disassembly process and the removal of the sealing device can easily introduce contaminants, which reduces the processing efficiency to some extent.

[0040] Although the present invention has been described above with reference to embodiments, various modifications can be made and components can be replaced with equivalents without departing from the scope of the present invention. In particular, as long as there is no structural conflict, the features in the embodiments disclosed in this invention can be combined with each other in any way. The lack of an exhaustive description of these combinations in this specification is merely for the sake of brevity and resource conservation. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A re-vacuumable X-ray tube, characterized in that, The device includes a glass shell (1), a cathode assembly at one end of the glass shell (1), an anode assembly at the other end of the glass shell (1), the cathode assembly generates free electrons through thermionic emission, the anode assembly absorbs free electrons and generates X-rays, a metal protective shell (2) is fixedly connected to the outside of the glass shell (1), a through groove (32) is provided at the bottom of the metal protective shell (2), a driving assembly is provided on one side of the metal protective shell (2), the driving assembly drives the anode assembly to rotate, and an oil pipe (11) is provided at one end of the glass shell (1). The glass shell (1) is filled with insulating oil. One end of the oil pipe (11) is provided with a first external thread (12). One end of the oil pipe (11) is threadedly connected to a first sealing cap (4). The anode assembly includes an anode tube (7). One end of the anode tube (7) is provided with a vacuum port. The outer side of the vacuum port is provided with a second external thread (18). The outer side of the vacuum port is threadedly connected to a second sealing cap (3). The anode tube (7) is provided with a check valve assembly. The check valve assembly prevents the insulating oil from leaking out while allowing external air to flow back into the glass shell (1).

2. The X-ray tube with reusable vacuum according to claim 1, characterized in that, The check valve assembly includes a first fixing frame (20), both ends of which are fixedly connected to the inner wall of the anode tube (7). A first guide hole (21) is provided in the middle of the first fixing frame (20), and a second guide hole (22) is provided at both ends of the first fixing frame (20). A connecting rod (8) is movably connected inside the first guide hole (21).

3. The X-ray tube with reusable vacuum according to claim 2, characterized in that, One end of the connecting rod (8) is fixedly connected to a first protrusion (25), and a sealing ring (26) is fixedly connected to one side of the first protrusion (25). Both ends of one side of the first protrusion (25) are fixedly connected to guide posts (27). One end of the guide post (27) passes through the second guide hole (22) and is fixedly connected to a first limiting block (29). Multiple springs (28) are provided between one side of the first protrusion (25) and one side of the first fixing frame (20). One end of the anode tube (7) is provided with a second protrusion, and the middle of the second protrusion is provided with a first through hole (19).

4. The X-ray tube with reusable vacuum according to claim 3, characterized in that, The cathode assembly includes a cathode tube (6), and a second through hole (13) is provided at one end of the glass shell (1), with the cathode tube (6) located inside the second through hole (13).

5. The X-ray tube with reusable vacuum according to claim 4, characterized in that, A second limiting block (36) is provided at one end of the cathode tube (6), and a third limiting block (23) is provided at one end of the cathode tube (6). The second limiting block (36) and the third limiting block (23) are located at both ends of the second through hole (13). A tungsten wire (24) is fixedly connected inside the cathode tube (6).

6. The X-ray tube with reusable vacuum according to claim 5, characterized in that, The glass shell (1) has a third through hole (14) at one end, and the anode tube (7) is located inside the third through hole (14).

7. The X-ray tube with reusable vacuum according to claim 6, characterized in that, The anode tube (7) is provided with a fourth limiting block (16) at one end and a fifth limiting block (17) at the other end. The fourth limiting block (16) and the fifth limiting block (17) are located at both ends of the third through hole (14). A target block (15) is fixedly connected to one end of the anode tube (7).

8. The X-ray tube with reusable vacuum according to claim 7, characterized in that, The metal protective shell (2) is provided with a first limiting groove (30) and a second limiting groove (31) respectively. The glass shell (1) is provided with a plurality of sixth limiting blocks (9) on the outside. A seventh limiting block (10) is fixedly connected between the plurality of sixth limiting blocks (9). The sixth limiting block (9) is located in the first limiting groove (30), and the seventh limiting block (10) is located in the second limiting groove (31).

9. The X-ray tube with reusable vacuum according to claim 8, characterized in that, The drive assembly includes an electromagnetic coil (33), and a power connector (5) is fixedly connected to one side of the metal protective shell (2). The power connector (5) is electrically connected to the electromagnetic coil (33). A permanent magnet is fixedly connected to the outer wall of the anode tube (7), and the anode tube (7) is located at the center of the electromagnetic coil (33).

10. The X-ray tube with reusable vacuum according to claim 9, characterized in that, The metal protective shell (2) is provided with a plurality of second fixing brackets (34) at one end, and screws (35) are movably connected to one end of the second fixing brackets (34).

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