CN212750799U - High-precision X-ray tube - Google Patents
High-precision X-ray tube Download PDFInfo
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- CN212750799U CN212750799U CN202022018780.6U CN202022018780U CN212750799U CN 212750799 U CN212750799 U CN 212750799U CN 202022018780 U CN202022018780 U CN 202022018780U CN 212750799 U CN212750799 U CN 212750799U
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Abstract
The utility model discloses a high-precision X-ray tube, wherein a cathode is arranged at one side in a shell, one end of the cathode is arranged outside the shell, and the other end of the cathode is arranged towards an anode; the anode is arranged in the shell, one end of the anode is arranged outside the shell, the other end of the anode is arranged towards the cathode, and the end face of the anode, which is close to the cathode, is obliquely arranged; the cap body is provided with a cavity, the cap body is sleeved on the anode, the anode is matched with the cavity, and the anode is arranged in the cavity; the cap body is also provided with a first through hole and a second through hole, and the first through hole, the cavity and the second through hole are communicated; the first through hole is arranged along the moving direction of electrons, the electrons bombard on the anode through the first through hole, and one end, far away from the anode, of the second through hole is arranged towards the shell. According to the scheme, redundant X rays are blocked by the cap body, and rays which are originally scattered to other directions are blocked, so that the rays are emitted from the second through hole, and the directivity of ray output is ensured; meanwhile, the cap body can block redundant rays, and the accuracy of the X-ray tube is improved.
Description
Technical Field
The utility model relates to an X ray equipment technical field especially relates to an X-ray tube of high accuracy.
Background
The X-ray tube is a vacuum diode operating at high voltage. Comprises two electrodes: one is a filament for emitting electrons as a cathode, and the other is a target for receiving electron bombardment as an anode. Both stages are sealed within a high vacuum glass or ceramic housing. However, the existing X-ray tube only has one vacuum tube, the exposed anode structure lacks a structure for limiting X-rays, and the X-rays are scattered from various places during the working process, so that the scattering phenomenon of the X-rays occurs, the X-ray output and the equipment receiving are influenced, and the output precision of the X-ray tube is influenced.
SUMMERY OF THE UTILITY MODEL
Therefore, it is necessary to provide a high-precision X-ray tube which solves the scattering phenomenon of the radiation and improves the precision of the X-ray tube.
To achieve the above object, the present application provides a high-precision X-ray tube including: a cathode, an anode, a cap body and a shell; the interior of the shell is a vacuum environment, and the cathode and the anode are arranged in the shell;
the cathode is arranged on one side in the shell, one end of the cathode is arranged outside the shell and is used for being connected with a power supply, and the other end of the cathode is arranged towards the anode and is used for emitting electrons to the anode;
the anode is arranged in the shell, one end of the anode is arranged outside the shell and is used for being connected with the cooling pipeline, and the other end of the anode is arranged towards the cathode and is used for receiving bombardment of the cathode; the anode is obliquely arranged close to the end face of the cathode;
the cap body is provided with a cavity for accommodating the anode, the cap body is sleeved on the anode, the anode is matched with the cavity, and the anode is arranged in the cavity; the cap body is also provided with a first through hole and a second through hole, and the first through hole, the cavity and the second through hole are communicated; the first through hole is arranged along the moving direction of electrons, the electrons are bombarded on the anode through the first through hole, and one end, far away from the anode, of the second through hole faces the shell.
Further, still include: a beryllium sheet window; the beryllium sheet window is arranged on the shell and is opposite to the second through hole.
Further, the cap body is a copper cap body.
Further, the housing is a glass housing.
Further, the inclination angle of the anode end face to the horizontal direction is 20 °.
Further, the first through hole and the second through hole are perpendicular to each other.
Furthermore, the edge of one side, close to the cathode, of the first through hole is provided with a fillet, and the edge of one side, close to the shell, of the second through hole is provided with a fillet.
Further, an external thread is arranged at one end, arranged outside the shell, of the anode and is used for being in threaded connection with an external cooling pipeline.
Different from the prior art, the technical scheme has the advantages that redundant X rays are blocked by the cap body, and rays originally scattered to other directions are blocked, so that the rays are emitted from the second through hole, and the output directivity of the rays is ensured; meanwhile, the cap body enables the rays emitted out of the second through hole to have certain directivity by blocking redundant rays, the original X rays which are not output in a certain direction are changed into the X rays emitted out along the direction of the second through hole, and the accuracy of the X-ray tube is improved.
Drawings
FIG. 1 is a cross-sectional view of the high precision X-ray tube;
FIG. 2 is a cross-sectional view of the cap;
fig. 3 is a structural view of the high-precision X-ray tube.
Description of reference numerals:
1. a cathode; 2. an anode; 3. a cap body; 4. a housing; 5. a beryllium sheet window;
31. a first through hole; 32. a second through hole; 33; a cavity.
Detailed Description
To explain technical contents, structural features, and objects and effects of the technical solutions in detail, the following detailed description is given with reference to the accompanying drawings in conjunction with the embodiments.
Referring to fig. 1 to 3, the present embodiment includes: a cathode 1, an anode 2, a cap body 3 and a shell 4; the interior of the shell 4 is a vacuum environment, and the cathode 1 and the anode 2 are arranged in the shell 4; in some embodiments, the cap body 3 is a copper cap body 3, but may be made of other metal materials or alloy materials as long as the material is not the same as the material of the anode 2. The cathode 1 is arranged on one side in the shell 4, one end of the cathode 1 is arranged outside the shell 4 and is used for connecting a power supply, and the other end of the cathode 1 is arranged towards the anode 2 and is used for emitting electrons to the anode 2; the anode 2 is arranged in the shell 4, one end of the anode 2 is arranged outside the shell 4 and is used for connecting a cooling pipeline, and the other end of the anode 2 is arranged towards the cathode 1 and is used for receiving bombardment of the cathode 1; the anode 2 is obliquely arranged close to the end face of the cathode 1; the cap body 3 is provided with a cavity 33 for accommodating the anode 2, the cap body 3 is sleeved on the anode 2, the anode 2 is matched with the cavity 33, and the anode 2 is arranged in the cavity 33; the cap body 3 is further provided with a first through hole 31 and a second through hole 32, and the first through hole 31, the cavity 33 and the second through hole 32 are communicated with each other; the first through hole 31 is arranged along the moving direction of electrons, the electrons bombard the anode 2 through the first through hole 31, and one end of the second through hole 32, which is far away from the anode 2, is arranged towards the shell 4. It should be noted that, a high voltage dc electric field is applied to the cathode 1 and the anode 2, and an ac low voltage is applied to the filament end on the cathode 1 to generate electrons, the dc electric field accelerates the electrons generated by the cathode 1 and bombards the inclined plane of the anode 2 through the first through hole 31, and the electrons generate transition and generate X-rays at the same time; and is ejected toward the second through hole 32. The direction of the electrons is from the cathode 1 to the anode 2, so the direction of the current is from the anode 2 to the cathode 1, at this time, the electrons impact on the anode 2 (tungsten target) in a high-energy and high-speed state, the high-speed electrons reach the anode 2, the motion is suddenly stopped, a small part of the kinetic energy is converted into radiation energy, and the radiation energy is emitted in the form of X-rays, and the X-rays are emitted through the second through holes 32 on the cap body 3. It should be further noted that the X-rays emitted from the X-ray tube are located around the inclined surface of the anode 2, i.e. the X-rays are scattered from the inclined surface of the anode 2 to the periphery; in the area where the X-ray is scattered from the inclined plane of the anode 2 to the periphery, if the cap body 3 is not limited, the X-ray is scattered towards the shell 4 opposite to the inclined plane, and the range of the generated X-ray is large and not accurate enough; if the cap 3 is used, unwanted X-rays can be blocked, leaving the wanted X-rays behind, thereby improving the accuracy of the X-ray tube. The arrangement that the through hole is over against the transmitting end ensures the directivity of ray output; the shielding layer absorbs X-rays except the through holes, changes original X-rays which are not output in a certain direction into X-rays which are only output from the through holes, and improves the adaptability of the X-rays.
Referring to fig. 2, it should be noted that the electron injection and the X-ray injection at a predetermined angle are realized by the cooperation of the inclined slope of the anode 2 and the cap body 3; specifically, electrons are emitted from the cathode 1, and are emitted through the first through hole 31, and simultaneously bombard onto the inclined surface of the anode 2 with an inclination angle of 20 degrees, so that the X-rays are scattered in a certain direction; the X-ray scattered towards a certain direction is blocked by the second through hole 32, part of the X-ray is blocked, and the X-ray in a required direction is reserved; the X-ray emitted by the X-ray tube has directivity, and the accuracy of the device is improved. It should be further noted that, referring to fig. 2, the cavity 33, the first through hole 31 and the second through hole 32 are communicated with each other, and the first through hole 31 and the second through hole 32 are at an angle of 90 °; of course, the inclination angle of the anode 2 may be other angles, and the angle between the second through hole 32 and the first through hole 31 may be constant. The cavity 33 of the cap body 3 is sleeved on the anode 2, so that the inclined plane of the anode 2 is the bottom of the first through hole 31 and the second through hole 32, that is, the connection part of the first through hole 31 and the second through hole 32 is the cavity 33, and when the anode 2 is placed in the cavity 33, the connection part of the first through hole 31 and the second through hole 32 is the anode 2. Electrons can bombard the inclined surface of the anode 2 through the first through hole 31, and X-rays can be emitted through the second through hole 32. The inclination angle of the anode end face and the horizontal direction is 20 degrees, and the horizontal direction is the direction perpendicular to the movement of electrons. According to the technical scheme, redundant X rays are blocked by the cap body 3, rays which are originally scattered to other directions are blocked, and the directivity of ray output is ensured; while improving the accuracy of the X-ray tube.
In this embodiment, the end of the anode 2 outside the housing 4 is screwed to connect to an external cooling circuit. It should be noted that a large amount of heat is generated when the cathode 1 bombards the anode 2. In order to allow a stable operation of the X-ray tube. The end of the anode 2 far away from the cathode 1 adopts a threaded interface, and the arrangement of the threaded interface is convenient for an external pipeline to cool an oil path inside the anode 27. The cooling oil path can ensure efficient and stable operation of the anode 2.
Referring to fig. 1 or 3, in some embodiments, the X-ray tube further includes: a beryllium sheet window 5; the beryllium sheet window 5 is arranged on the housing 4, and the beryllium sheet window 5 is opposite to the second through hole 32. The X-rays emitted from the second through hole 32 pass through the beryllium sheet window 5 facing the second through hole 32, and the emitted X-rays are filtered by the beryllium sheet on the beryllium sheet window 5 and change. In particular, beryllium is almost transparent to X-rays and can therefore be used as a window through which X-rays are transmitted. It should be further noted that the size of the beryllium sheet window 5 is the same as that of the hole in the housing 4, the beryllium sheet window 5 is just placed in the hole in the housing 4, and a sealing ring is further disposed at a connection between the beryllium sheet window 5 and the housing 4. The provision of a sealing ring may further improve the gas tightness within the housing 4. The beryllium sheet window 5 is arranged to further ensure the directivity of ray output; meanwhile, the cap body 3 blocks redundant rays, so that the rays emitted out of the second through hole 32 have certain directivity, and the original X-rays which are not output in the direction are changed into the X-rays emitted out along the direction of the second through hole 32, so that the accuracy of the X-ray tube is improved.
Referring to fig. 2, in order to improve the working efficiency of the X-ray tube, a rounded corner is disposed at an edge of the first through hole close to one side of the cathode, and a rounded corner is disposed at an edge of the second through hole close to one side of the housing. It should be noted that, the rounded corner of the first through hole faces the cathode, and when the cathode emits a large amount of electrons, the rounded corner can make more electrons bombard the inclined plane of the anode through the first through hole, so that the anode emits more X-rays, thereby improving the working efficiency of the X-ray tube. One end of the second through hole, which is far away from the anode, is also provided with a fillet, and the arrangement of the fillet on the second through hole can enable more X-rays with certain directivity to be emitted out of the second through hole and to pass through the beryllium sheet window; the application is that redundant and non-directional X rays are blocked by the cap body, and the first through hole and the second through hole improve the emission amount of the X rays by increasing the injection amount of electrons; the cap body and the fillet are arranged, so that the working efficiency of the X-ray tube is further improved on the premise of ensuring the accuracy of X-rays.
In some embodiments, in order to facilitate installation of an external cooling pipeline, an external thread is provided on an end of the anode disposed outside the housing, and the external thread is used for being in threaded connection with the external cooling pipeline. It should be noted that the existing external pipeline is directly sleeved on one end of the anode outside the shell; in actual operation of the X-ray tube, the external pipeline is very easy to fall off, thereby causing the anode to be overheated. For this application, through set up the external screw thread on the one end that the positive pole was placed outside the casing, make the two can not break away from when the operation to further improve the operating efficiency of equipment.
It should be noted that, although the above embodiments have been described herein, the scope of the present invention is not limited thereby. Therefore, based on the innovative concept of the present invention, the changes and modifications of the embodiments described herein, or the equivalent structure or equivalent process changes made by the contents of the specification and the drawings of the present invention, directly or indirectly apply the above technical solutions to other related technical fields, all included in the protection scope of the present invention.
Claims (8)
1. A high precision X-ray tube comprising: a cathode, an anode, a cap body and a shell; the interior of the shell is a vacuum environment, and the cathode and the anode are arranged in the shell;
the cathode is arranged on one side in the shell, one end of the cathode is arranged outside the shell and is used for being connected with a power supply, and the other end of the cathode is arranged towards the anode and is used for emitting electrons to the anode;
the anode is arranged in the shell, one end of the anode is arranged outside the shell and is used for being connected with the cooling pipeline, and the other end of the anode is arranged towards the cathode and is used for receiving bombardment of the cathode; the anode is obliquely arranged close to the end face of the cathode;
the cap body is provided with a cavity for accommodating the anode, the cap body is sleeved on the anode, the anode is matched with the cavity, and the anode is arranged in the cavity; the cap body is also provided with a first through hole and a second through hole, and the first through hole, the cavity and the second through hole are communicated; the first through hole is arranged along the moving direction of electrons, the electrons are bombarded on the anode through the first through hole, and one end, far away from the anode, of the second through hole faces the shell.
2. The high precision X-ray tube of claim 1, further comprising: a beryllium sheet window; the beryllium sheet window is arranged on the shell and is opposite to the second through hole.
3. The high precision X-ray tube of claim 1, wherein the cap is a copper cap.
4. The high precision X-ray tube of claim 1 wherein the housing is a glass housing.
5. The high precision X-ray tube of claim 1 wherein the anode face is inclined at an angle of 20 ° to the horizontal.
6. The high precision X-ray tube of claim 1 wherein the first through hole and the second through hole are perpendicular to each other.
7. The high-precision X-ray tube according to claim 1, wherein the edge of the first through hole close to the cathode side is provided with a rounded corner, and the edge of the second through hole close to the shell side is provided with a rounded corner.
8. The high precision X-ray tube of claim 1, wherein the anode is provided with external threads on an end disposed outside the housing, the external threads adapted to be threadedly connected to an external cooling line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022018780.6U CN212750799U (en) | 2020-09-15 | 2020-09-15 | High-precision X-ray tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022018780.6U CN212750799U (en) | 2020-09-15 | 2020-09-15 | High-precision X-ray tube |
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| Publication Number | Publication Date |
|---|---|
| CN212750799U true CN212750799U (en) | 2021-03-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202022018780.6U Active CN212750799U (en) | 2020-09-15 | 2020-09-15 | High-precision X-ray tube |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116705579A (en) * | 2023-08-07 | 2023-09-05 | 上海超群检测科技股份有限公司 | Internally and externally shielded window assembly suitable for X-ray source and X-ray source |
-
2020
- 2020-09-15 CN CN202022018780.6U patent/CN212750799U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116705579A (en) * | 2023-08-07 | 2023-09-05 | 上海超群检测科技股份有限公司 | Internally and externally shielded window assembly suitable for X-ray source and X-ray source |
| CN116705579B (en) * | 2023-08-07 | 2023-09-29 | 上海超群检测科技股份有限公司 | Internally and externally shielded window assembly suitable for X-ray source and X-ray source |
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