CN111081511B

CN111081511B - Anode target disk for rotary anode X-ray tube

Info

Publication number: CN111081511B
Application number: CN201911353920.0A
Authority: CN
Inventors: 陈庆春
Original assignee: Chizhou Hengfeng Electronic Engineering Co ltd
Current assignee: Chizhou Hengfeng Electronic Engineering Co ltd
Priority date: 2019-12-25
Filing date: 2019-12-25
Publication date: 2022-11-11
Anticipated expiration: 2039-12-25
Also published as: CN111081511A

Abstract

The invention relates to the technical field of X-ray tubes and discloses an anode target disc for a rotary anode X-ray tube, which comprises an anode target disc, a beryllium window and a high-voltage plug, wherein a secondary target disc is arranged on one side of the anode target disc, the other side of the secondary target disc is movably sleeved in a supporting rod, the other end of the supporting rod is fixedly connected to one end of the high-voltage plug, permanent magnets which are correspondingly arranged are fixedly arranged on the opposite sides of the anode target disc and the secondary target disc, the magnetic poles of the opposite sides of the two permanent magnets are different, and the outer edge of the disc diameter of the secondary target disc is just positioned on the inner edge of the disc diameter of the anode target disc. The secondary target disc is arranged on one side of the anode target disc, partial scattered X rays are received by the side edge of the secondary target disc, and the X rays are used for exciting the X rays of the secondary target disc again to enable newly generated secondary X rays to be emitted, so that the scattered and lost X rays are used for reinforcing the lost X rays, and the emission quality of the X rays is improved.

Description

Anode target disk for rotary anode X-ray tube

Technical Field

The invention relates to the technical field of X-ray tubes, in particular to an anode target disk for a rotary anode X-ray tube.

Background

The basic structure of the X-ray tube is composed of a cathode (filament), an anode (target), a focusing system, an anode cover and a window, which are sealed in a high vacuum glass (ceramic) casing. Typically, the anode target disk is fixedly mounted, and a cooling system is used to dissipate heat from the fixed anode. Because the focal spot temperature of the fixed anode is limited to a certain extent, overheating causes the anode to melt, and therefore, in order to increase the power, the focal spot is increased to increase the heat dissipation area, and as a result, the image quality is reduced.

Referring to fig. 1, the glass cover comprises a glass cover 1, a stator 2, a rotor 3, an anode target disc 4, a beryllium window 5, a high-voltage plug 6 and a tungsten wire 7, alternating current is conducted through the stator 2, so that the stator 2 generates a magnetic field, the rotor 3 is driven to rotate, the anode target disc 4 is driven to rotate at a high speed, electrons are emitted to the beryllium window 5 through the tungsten wire 7, the electrons strike on an edge inclined plane of the anode target disc 4, and X rays are generated and emitted out through the beryllium window 5.

Because the anode target disk 4 rotates at a high speed, X rays generated by the anode target disk deflect due to the rotation, the emergent quality of the X rays is influenced, and the single working time is short due to the fact that the X rays mainly depend on radiation heat dissipation, and the application field of the X rays is seriously influenced, so that the rotary anode target disk is provided, and the problems are optimized.

Disclosure of Invention

Aiming at the defects of the prior rotary anode X-ray tube in the use process, the invention provides the anode target disk for the rotary anode X-ray tube, which has the advantages of optimized X-ray emitting quality and improved single operation time and solves the problems in the prior art.

The invention provides the following technical scheme: the utility model provides an anode target dish for rotatory anode X fluorescent tube, includes anode target dish, beryllium window and high voltage plug, one side of anode target dish is equipped with secondary target dish, the inside in the bracing piece is cup jointed in the opposite side activity of secondary target dish, the other end fixed connection of bracing piece is in the one end of high voltage plug the equal fixed mounting of one side relatively of anode target dish and secondary target dish corresponds the permanent magnet of arranging, two the opposite face magnetic pole of permanent magnet is different, the dish footpath outward flange of secondary target dish is located the dish footpath inward flange of anode target dish just, the perpendicular line of the hypotenuse conical surface of secondary target dish falls near the axis of beryllium window.

Preferably, one side fixedly connected with connecting rod of secondary target dish, the other end of connecting rod stretches into the inside of bracing piece, the fixed cover in outside of connecting rod has connect the slider, the outside activity of slider is cup jointed in the inner chamber of bracing piece, the tip activity of connecting rod has cup jointed sealed piston and horizontal spacing joint sealed piston's opposite side and the inner chamber that is located the bracing piece are filled with inflation liquid.

Preferably, the expansion fluid is organic oil.

Preferably, the end part of the inner cavity of the support rod is provided with a limiting block for limiting the movement of the sliding block, and the maximum displacement for limiting the movement of the sliding block by the limiting block is the initial distance between the secondary target disk and the anode target disk.

The invention has the following beneficial effects:

1. the secondary target disc is arranged on one side of the anode target disc, partial scattered X rays are received by the side edge of the secondary target disc, and the X rays are used for exciting the X rays of the secondary target disc again to enable newly generated secondary X rays to be emitted, so that the scattered and lost X rays are used for reinforcing the lost X rays, and the emission quality of the X rays is improved.

2. The two permanent magnets which are magnetically attracted are arranged between the anode target disk and the secondary target disk, and when the anode target disk rotates to drive one of the permanent magnets to rotate, the two permanent magnets are driven to rotate by the magnetic attraction, so that the secondary target disk is driven.

3. According to the invention, the connecting rod is movably clamped in the sealing piston, and the expansion liquid is filled on one side of the sealing piston, so that when the radiation temperature in the glass cover is higher, the expansion liquid expands to push the sealing piston to move, and the secondary target disk is in contact with the end face of the anode target disk, therefore, a new heat radiation body can be provided for the anode target disk, and the operation time can be prolonged in a single operation.

Drawings

FIG. 1 is a schematic diagram of a conventional rotary anode X-ray tube;

FIG. 2 is a schematic structural view of the present invention;

FIG. 3 is a schematic view of the secondary target disk of FIG. 2 according to the present invention.

In the figure: 1. a glass cover; 2. a stator; 3. a rotor; 4. an anode target disk; 5. a beryllium window; 6. a high-voltage plug; 7. a tungsten filament; 8. a secondary target disk; 9. a support bar; 10. a permanent magnet; 11. a connecting rod; 12. a slider; 13. the piston is sealed.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.

Referring to fig. 1-3, an anode target disk for a rotary anode X-ray tube comprises a glass cover 1, a stator 2 is fixedly mounted at the outer end of the glass cover 1, a rotor 3 is fixedly mounted at the inner end of the glass cover 1 and positioned in the stator 2, an anode target disk 4 is fixedly connected to the end of an output shaft of the rotor 3, a beryllium window 5 is arranged at the side of the glass cover 1 and positioned opposite to the beveled edge of the anode target disk 4, a high-voltage plug 6 is arranged at the other end of the glass cover 1, and a tungsten filament 7 facing the beveled edge of the anode target disk 4 is fixedly mounted at the bottom of one end of the glass cover 1, into which the high-voltage plug 6 extends. One side at anode target dish 4 is equipped with secondary target dish 8, the opposite side activity of secondary target dish 8 is cup jointed in the inside of bracing piece 9, this activity cup joints the mode and can adopts ways such as loop bar and sleeve, loop bar and bearing to accomplish, preferably, can also adopt the subsequent cup joint mode that provides of this application, the other end fixed connection of bracing piece 9 is in the one end of high-voltage plug 6, permanent magnet 10 that corresponds the arrangement is all fixed mounting in anode target dish 4 and secondary target dish 8 relative one side, the magnetic pole of opposite face is different, the dish footpath outward flange of secondary target dish 8 is located the dish footpath inward flange of anode target dish 4 just (the inside and outside edge of here is respectively the inner circle and the outer lane of the oblique edge of anode target dish 4 and secondary target dish 8), the perpendicular line of the hypotenuse conical surface of secondary target dish 8 falls near beryllium window 5's axis.

Since the characteristic of X-ray imaging is related to the atomic number composition to be imaged and secondary X-rays are used, the metal atomic number of the material constituting the secondary target disk 8 needs to be lower than the metal atomic number of the anode target disk 4. By arranging the secondary target disk 8, secondary X-rays are generated when scattered X-rays lost by the anode target disk 4 hit the secondary target disk 8 and then are emitted through the beryllium window 5, so that the amount of the scattered X-rays lost by the anode target disk 4 due to high-speed rotation can be effectively compensated, and the quality of the finally emitted X-rays is improved. Although there are X-rays of two energies in the X-ray emitted at this time, the characteristic imaging can be completed as long as the atomic number of the object to be imaged is lower than the atomic number of the secondary target disk 8.

Meanwhile, by arranging the permanent magnets 10, when one permanent magnet 10 is driven to rotate by the rotation of the anode target disk 4, the two permanent magnets 10 are driven to rotate by the attraction of magnetism, so that the driven of the secondary target disk 8 is realized, and because the quantity of scattered X-rays received by the secondary target disk 8 is relatively low, the requirement on the rotating speed can be reduced, and the driving energy consumption of the stator 2 can be reduced.

One side of the secondary target disk 8 is fixedly connected with a connecting rod 11, the other end of the connecting rod 11 extends into the supporting rod 9, the outer part of the connecting rod 11 is fixedly sleeved with a sliding block 12, the outer part of the sliding block 12 is movably sleeved in the inner cavity of the supporting rod 9, the end part of the connecting rod 11 is movably sleeved on one side of a sealing piston 13 and is horizontally limited and clamped, the inner cavity, which is positioned on the supporting rod 9, of the other side of the sealing piston 13 is filled with expansion liquid, and the expansion liquid can be organic oil, such as glycerol, so that the boiling point can be 200-300 ℃ or above. When the radiation temperature in the glass cover 1 is higher, the expansion oil on one side of the sealing piston 13 is heated to expand to push the sealing piston 13 to move transversely, and the secondary target disk 8 is contacted with the end face of the anode target disk 4 after rotating, so that the secondary target disk 8 provides a new heat radiator for the anode target disk 4, and the time of single operation of the X-ray tube can be prolonged. The design of the connecting rod 11 and the sealing piston 13 can skillfully realize relative rotation and simultaneously provide the possibility of transverse movement.

Because the glass cover 1 is in a high vacuum environment, one side of the sealing piston 13 is filled with the expansion liquid in a vacuum state, even though the two permanent magnets 10 have suction force, the sealing piston 13 cannot be pulled, because the expansion liquid on one side of the sealing piston 13 is under the sealing condition of the sealing piston 13, the air pressure on two sides of the sealing piston 13 is completely equal, and at the moment, if the suction force needs to overcome the molecular force of the expansion liquid when the sealing piston 13 is pulled, the pulling is difficult, and further, the stable separation of the two permanent magnets 10 in a non-expansion state is ensured.

Wherein, the inner chamber tip of bracing piece 9 is equipped with the stopper that the restriction slider 12 removed, and the maximum displacement that stopper restriction slider 12 removed is the initial interval of secondary target dish 8 and positive pole target dish 4. The expansion liquid is prevented from pushing the sealing piston 13 excessively to cause the secondary target disk 8 to be tightly abutted against the anode target disk 4, so that the driving system of the stator 2 is prevented from being influenced.

It should be noted that, in this document, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. An anode target disk for a rotary anode X-ray tube, comprising an anode target disk (4), a beryllium window (5) and a high-voltage plug (6), characterized in that: a secondary target disc (8) is arranged on one side of the anode target disc (4), the other side of the secondary target disc (8) is movably sleeved inside a supporting rod (9), the other end of the supporting rod (9) is fixedly connected to one end of a high-voltage plug (6), permanent magnets (10) which are correspondingly arranged are fixedly installed on the opposite sides of the anode target disc (4) and the secondary target disc (8), the opposite magnetic poles of the two permanent magnets (10) are different, the outer edge of the disc diameter of the secondary target disc (8) is just positioned on the inner edge of the disc diameter of the anode target disc (4), and the vertical line of the bevel edge conical surface of the secondary target disc (8) falls near the central axis of the beryllium window (5);

one side fixedly connected with connecting rod (11) of secondary target dish (8), the other end of connecting rod (11) stretches into the inside of bracing piece (9), slider (12) have been cup jointed to the external fixation of connecting rod (11), the outside activity of slider (12) is cup jointed in the inner chamber of bracing piece (9), the tip activity of connecting rod (11) has been cup jointed sealed piston (13) and the spacing joint of level the opposite side of sealed piston (13) and the inner chamber that is located bracing piece (9) are filled up and are full of the inflation liquid.

2. An anode target disk for a rotating anode X-ray tube according to claim 1, wherein: the expansion liquid is organic oil.

3. An anode target disk for a rotating anode X-ray tube according to claim 1, wherein: the end part of the inner cavity of the support rod (9) is provided with a limiting block for limiting the movement of the sliding block (12), and the maximum movement of the limiting block for limiting the movement of the sliding block (12) is the initial distance between the secondary target disc (8) and the anode target disc (4).