阅读说明：本技术 一种全角度的弧形阵列x射线管及环形射线装置 (Full-angle arc-shaped array X-ray tube and annular ray device ) 是由 王啸 汪上杰 邱隆华 方奇 叶华伟 于 2021-07-27 设计创作，主要内容包括：本发明涉及一种X射线管,尤其是一种全角度的弧形阵列X射线管及环形射线装置。一种全角度的弧形阵列X射线管,包括圆弧形的射线管本体,所述射线管本体的内圆弧面上设有发射窗口；还包括陶瓷片,所述陶瓷片固定在所述射线管本体的两端,用于阴极和/或阳极的高压绝缘。本发明提供的一种全角度的弧形阵列X射线管通过在射线管的两端装有陶瓷板实现高压绝缘,简化了结构,并且使接管壳两端处也能安装阴极组件,从而实现全角度的焦点放线,提高了断层扫描质量。(The invention relates to an X-ray tube, in particular to a full-angle arc array X-ray tube and an annular ray device. A full-angle arc array X-ray tube comprises an arc-shaped tube body, wherein an emission window is arranged on the inner arc surface of the tube body; the high-voltage insulating ceramic tube further comprises ceramic plates, wherein the ceramic plates are fixed at two ends of the tube body and used for high-voltage insulation of the cathode and/or the anode. According to the full-angle arc array X-ray tube provided by the invention, high-voltage insulation is realized by arranging ceramic plates at two ends of the X-ray tube, the structure is simplified, and the cathode assemblies can be arranged at two ends of the connecting tube shell, so that full-angle focus paying-off is realized, and the layer-breaking scanning quality is improved.)

1. An all-angle arc array X-ray tube comprises a tube body, wherein an emission window (11) is arranged on the tube body; the high-voltage insulating ceramic tube is characterized by further comprising ceramic plates (6), wherein the ceramic plates (6) are fixed at two ends of the tube body and used for high-voltage insulation of a cathode and/or an anode.

2. A full-angle arc array X-ray tube according to claim 1, wherein the emission window (11) communicates with both sides of the tube body.

3. A full-angle arc array X-ray tube according to claim 1 or 2, wherein the tube body comprises:

the device comprises a tube shell (1), wherein an emission window (11) is arranged on the tube shell (1);

the cathode core columns (2) are fixed on the tube shell (1), and a plurality of arc-shaped arrays are arranged;

a lead sleeve (27), said lead sleeve (27) being fixed to said cathode stem (2);

the top surface of the cathode plate (25) is fixed on the lead sleeve (27) and is positioned inside the tube shell (1);

the cathode assemblies (3) are mounted on the bottom surface of the cathode plate (25), a plurality of cathode assemblies are arranged in an arc array, and the cathode assemblies (3) are electrically connected with the cathode core column (2) and arranged opposite to the ceramic plates (6);

the anode assembly (4), the anode assembly (4) is arranged opposite to the cathode assembly (3), and the anode assembly (4) is fixed on the tube shell (1); and

a cooling assembly (5), wherein the cooling assembly (5) is fixed at the bottom of the anode assembly (4) and is used for cooling the anode assembly (4);

when emitting radiation, the cathode assembly (3) with negative high voltage emits electron beams to the grounded anode assembly (4), and the generated radiation is emitted from the emission window (11).

4. A full-angle arc array X-ray tube according to claim 3, wherein the cathode stem (2) comprises:

a stem (21), the stem (21) being electrically connected with the cathode assembly (3);

a stem ceramic (20), the stem (21) being fixed to the stem ceramic (20);

an inner race kovar (22), the stem ceramic (20) being fixed to the inner race kovar (22);

the cathode ceramic (23), the inner ring kovar (22) is fixed on the cathode ceramic (23); and

and the cathode ceramic (23) is fixed on the tube shell (1) through the outer ring kovar (24).

5. A full-angle arc array X-ray tube according to claim 3, wherein the cathode assembly (3) comprises:

a grid ceramic (33), the grid ceramic (33) being fixed to the cathode plate (25);

a grid (31), the grid (31) being fixed on the grid ceramic (33); and

a filament (32), the filament (32) being mounted on the cathode plate (25).

6. A full-angle arc array X-ray tube according to claim 3, wherein the anode assembly (4) comprises:

the target disc (41), the target disc (41) is in a fan-shaped ring shape;

the base body (42), the base body (42) is in a fan-shaped ring shape, the target disc (41) is fixed on the top of the base body (42), the base body (42) is fixed on the tube shell (1), and the cooling component (5) is fixed on the bottom of the base body (42); and

the ray shielding cover (43) is in a fan-shaped ring shape, is arranged on the outer side face of the base body (42) and is used for shielding rays outside the emission window (11).

7. A full-angle arc array X-ray tube according to claim 3, wherein the cooling assembly (5) comprises:

the cooling disc (51), the cooling disc (51) is a hollow disc, and the cooling disc (51) is fixed at the bottom of the anode assembly (4); and

and the quick connectors (52) are fixed at two ends of the cooling disc (51) through the quick connectors (52).

8. A toroidal ray device comprising a plurality of said full angle arcuate array X-ray tubes of claim 1, said plurality of said full angle arcuate array X-ray tubes forming a torus.

9. The toroidal ray device according to claim 8, further comprising a flexible insulating sheet (9) having insulating property and elasticity, wherein the flexible insulating sheet (9) is located between two adjacent ceramic sheets (6) and has no air between the two ceramic sheets (6).

10. The toroidal ray device of claim 9, further comprising:

a first deflection coil (85), the first deflection coil (85) being installed on an inner circumferential surface of the ring ray device and corresponding to a cathode of the tube body; and

a second deflection coil (86), the second deflection coil (86) being installed on an inner circumferential surface of the ring-shaped ray device and corresponding to an anode of the tube body;

the second deflection coil (86), the first deflection coil (85) and the annular ray device are coaxially arranged, and the current direction of the first deflection coil (85) is opposite to that of the second deflection coil (86).

Technical Field

The invention relates to an X-ray tube, in particular to a full-angle arc array X-ray tube and an annular ray device.

Background

X-ray tubes are used to generate X-rays, and play an important role in various fields such as medical diagnosis, safety inspection, and nondestructive inspection. The basic principle of the X-ray tube is that thermal electrons thermally excited by the cathode filament strike the target plate under the action of the cathode and anode accelerating electric field. Wherein 1% of the energy is converted into X-rays and the remaining about 99% of the energy is converted into heat, resulting in a rapid temperature rise at the impacted site. The rotary anode X-ray tube adopts a method that an anode bearing drives an anode target disc to rotate at a high speed in a vacuum tube shell, so that heat is dispersed to the whole target disc, is transferred to the vacuum tube shell through heat radiation, and is taken away by cooling liquid flowing through the tube shell.

At present, a rotational scanning mode is widely adopted in a CT (Computed Tomography) system, and a machine frame drives a rotating anode X-ray CT tube to perform rotational scanning imaging. This approach is limited by the gantry rotation speed, while the anode bearing of the X-ray CT tube operates under high centrifugal force conditions, resulting in the bearing being prone to damage, which in turn causes failure of the entire X-ray CT tube.

Compared with the traditional CT, the static CT uses a multi-focus X-ray source, avoids the high-speed rotation of the traditional CT through multi-source exposure switching, and realizes faster tomography imaging. However, limited by size, static CT typically uses multiple sets of multiple focal spot X-ray sources with spacing between the individual X-ray sources to achieve high voltage isolation of the cathode or anode. This often results in a lack of focus between the multiple focal spot X-ray sources, which affects the quality of tomographic imaging.

Disclosure of Invention

In order to solve the problems, the invention provides an all-angle arc array X-ray tube which can realize all-angle focus pay-off and has high tomography quality, and the specific technical scheme is as follows:

an all-angle arc array X-ray tube comprises a tube body, wherein an emission window is arranged on the tube body; the high-voltage insulating ceramic tube further comprises ceramic plates, wherein the ceramic plates are fixed at two ends of the tube body and used for high-voltage insulation of the cathode and/or the anode.

Through adopting above-mentioned technical scheme, to two adjacent X-ray tubes, its negative pole subassembly distance is nearer and all is in the burden high pressure, and keeps apart through the ceramic dense piece to make two adjacent X-ray tube's negative pole subassembly can be close to the ceramic seal structure installation, reduce the distance between the negative pole subassembly, thereby guarantee the focus quantity of tube shell edge, avoided the disappearance of tube shell edge focus, thereby guaranteed to possess the X ray focus source of full angle in whole annular scanning plane.

Preferably, the emission window communicates with both sides of the tube.

By adopting the technical scheme, the emission window extends to two sides of the ray tube so as to ensure that the edge focus can have a larger emission angle.

Preferably, the tube body includes: the emission device comprises a tube shell, wherein an emission window is arranged on the tube shell; the cathode core columns are fixed on the tube shell, and a plurality of arc-shaped arrays are arranged; a lead sleeve fixed to the cathode stem; the top surface of the cathode plate is fixed on the lead sleeve and is positioned inside the tube shell; the cathode assemblies are arranged on the bottom surface of the cathode plate, a plurality of arc-shaped arrays are arranged, and the cathode assemblies are electrically connected with the cathode core columns; the anode assembly is arranged opposite to the cathode assembly, and the anode assembly is fixed on the tube shell; the cooling assembly is fixed at the bottom of the anode assembly and used for cooling the anode assembly; when the radiation is emitted, the cathode assembly with negative high voltage emits electron beams to the grounded anode assembly, and the generated radiation is emitted from the emission window.

By adopting the technical scheme, the X-ray tubes are arranged in groups, the adjacent X-ray tubes are opposite to the cathodes thereof and are isolated by the ceramic plates, so that the problem of high-voltage insulation is avoided, and the cathodes can be arranged at the positions close to the tube shells, thereby realizing all-angle focus paying-off.

Preferably, the cathode stem comprises: the core column is electrically connected with the cathode assembly; the core column ceramic is fixed on the core column ceramic; the core column ceramic is fixed on the inner ring kovar; the inner ring is fixed on the cathode ceramic in a kovar way; and the cathode ceramic is fixed on the tube shell through the outer ring kovar.

Preferably, the cathode assembly includes: the grid ceramic is fixed on the cathode plate; the grid electrode is fixed on the grid electrode ceramic; and the filament is arranged on the cathode plate.

Preferably, the anode assembly comprises: the target disc is in a fan-shaped ring shape; the substrate is in a fan-shaped ring shape, the target disc is fixed at the top of the substrate, the substrate is fixed on the tube shell, and the cooling assembly is fixed at the bottom of the substrate; and the ray shielding cover is in a fan-shaped ring shape, is arranged on the outer side surface of the base body and is used for shielding rays outside the emission window.

Through adopting above-mentioned technical scheme, the cross section of ray shield cover is L shape, effectively shields the ray from nearly ray source end to effectively reduce the use amount of tube shell ray shielding metal, reduce whole pipe assembly weight.

Preferably, the cooling assembly includes: the cooling disc is fixed at the bottom of the anode assembly; and the quick connectors are fixed at two ends of the cooling disc and are positioned outside the pipe shell.

Through adopting above-mentioned technical scheme, quick-operation joint conveniently connects, and the coolant liquid can adopt oil or water, and the mode of liquid cooling has greatly promoted continuous input power.

Wherein, the bottom surface of cooling plate is equipped with a plurality of radiating groove.

By adopting the technical scheme, the radiating grooves further improve the radiating effect, reduce the temperature and ensure the promotion of continuous input power.

The annular ray device comprises a plurality of the full-angle arc-shaped array X-ray tubes, and the full-angle arc-shaped array X-ray tubes form a circular ring.

By adopting the technical scheme, the independent X-ray tubes are connected into a circular ring, so that the assembly is convenient, and the replacement is convenient.

Preferably, the ceramic chip further comprises an insulating soft board with insulating property and elasticity, wherein the insulating soft board is positioned between two adjacent ceramic chips and has no air between the two ceramic chips.

By adopting the technical scheme, the insulating property can be further improved after the air is extruded by the insulating soft board.

The connecting base and the connecting plate are respectively fixed at two ends of the ray tube body, and the connecting screws are respectively connected with the connecting base and the connecting plate and used for fixing the adjacent ray tube bodies together.

Through adopting above-mentioned technical scheme, the screw connection structure is simple to assembly and change convenience.

Preferably, the method further comprises the following steps: a first deflection coil installed on an inner circumferential surface of the ring ray device to correspond to a cathode of the tube body; a second deflection coil installed on an inner circumferential surface of the ring ray device to correspond to an anode of the tube body; the second deflection coil, the first deflection coil and the annular ray device are coaxially arranged, and the current direction of the first deflection coil is opposite to that of the second deflection coil.

By adopting the technical scheme, the two annular coils generate the magnetic field perpendicular to the advancing direction of the electron beams, and the deflection of the electron beams in the annular direction is realized through the magnetic field, so that the number of focuses is increased, and the better scanning imaging quality is realized.

Compared with the prior art, the invention has the following beneficial effects:

according to the full-angle arc array X-ray tube provided by the invention, high-voltage insulation is realized by arranging ceramic plates at two ends of the X-ray tube, the structure is simplified, and the cathode assemblies can be arranged at two ends of the connecting tube shell, so that full-angle focus paying-off is realized, and the layer-breaking scanning quality is improved.

The annular ray device provided by the invention generates magnetic fields in the direction vertical to the proceeding direction of the electron beams through the coils in two different current directions, and realizes the deflection of the electron beams in the annular direction through the magnetic fields, thereby improving the number of focuses and improving the quality of scanning imaging.

Drawings

FIG. 1 is a schematic diagram of a full-angle arc array X-ray tube;

FIG. 2 is an enlarged partial view of a portion of a hidden portion of a tube housing of a joint for joining two full angle arcuate array X-ray tubes together;

FIG. 3 is an enlarged partial cross-sectional view of a full angle arcuate array X-ray tube;

FIG. 4 is a schematic diagram of a full-angle arc array X-ray tube with the hidden envelope;

fig. 5 is a schematic structural view of a cathode stem;

FIG. 6 is a schematic view of the assembled structure of the cathode stem, cathode plate and cathode assembly;

FIG. 7 is a schematic structural view of a cathode assembly;

FIG. 8 is a schematic view of the anode assembly and cooling device;

FIG. 9 is a schematic view of a heat sink structure;

FIG. 10 is a perspective view of a front view of the toroidal ray device;

FIG. 11 is a perspective view of the annular radiation device in a rear view;

FIG. 12 is an enlarged view of a portion of the toroidal ray device.

Detailed Description

The invention will now be further described with reference to the accompanying drawings.

Example one

As shown in fig. 1 to 12, a full-angle arc array X-ray tube includes an arc-shaped tube body, and an emission window 11 is disposed on an inner arc surface of the tube body; the cathode and anode high-voltage insulation tube further comprises ceramic plates 6, wherein the ceramic plates 6 are fixed at two ends of the tube body and used for high-voltage insulation of the cathode and/or the anode.

To two adjacent X-ray tubes, its negative pole subassembly 3 is close and all is in the burden high pressure, and keeps apart through potsherd 6 to make two adjacent X-ray tube's negative pole subassembly 3 can be close to potsherd 6 installation, reduce the distance between the negative pole subassembly 3, thereby guarantee the focus quantity of 1 edge of tube shell, avoided the disappearance of 1 edge focus of tube shell, thereby guaranteed to possess the X ray focus source of full angle in whole annular scanning plane.

Specifically, as shown in fig. 1 to 3, the tube body includes a tube case 1, through holes 15 are formed at both ends of the tube case 1, and the ceramic sheet 6 is fixed on the through holes 15 by connecting the kovar rings 7.

The ceramic plate 6 and the connecting kovar ring 7 are welded by brazing, the connecting kovar ring 7 is welded on the through hole 15 and is in sealing welding, and the connecting kovar ring 7 is welded by argon arc welding or laser welding.

After the tube shell 1 is provided with the through hole 15, a negative high voltage cathode in the tube body is directly opposite to the ceramic chip 6, in the traditional X-ray tube, the cathode is at negative high voltage, the tube shell is grounded, and due to the potential difference between the cathode and the tube shell, the cathode and the tube shell need to be kept at a sufficient distance to realize high voltage insulation. The ceramic plates 6 are arranged at the two sides of the X-ray tube shell and close to the cathodes, and when the X-ray tubes are annularly arranged, the cathodes of the two adjacent X-ray tubes close to the tube shell are both at negative high voltage, so that the X-ray tubes can be close to each other at a short distance without the problem of high-voltage insulation. In this way, the X-ray tube can realize that the cathodes are arranged close to both ends of the envelope 1, shortening the distance between the cathodes inside two adjacent X-ray tubes.

In some embodiments, as shown in fig. 1, the emission window 11 communicates with both sides of the tube body. The emission window 11 extends to both sides of the tube body to ensure that the edge focus also has a larger emission angle.

In particular, the emission window 11 is in communication with both sides of the envelope 1, i.e. the emission window 11 extends to both sides of the envelope 1, to ensure that the edge focus can also have a larger emission angle.

The tube body further comprises a cathode stem 2, a cathode plate 25, a cathode assembly 3, an anode assembly 4 and a cooling assembly 5; wherein, the pipe shell 1 is fan-shaped, and the inner arc surface of the pipe shell 1 is provided with an emission window 11; the cathode core columns 2 are fixed on the tube shell 1, and a plurality of cathode core columns are arranged around the axis arc array of the tube shell 1; the cathode plate 25 is in a fan-ring shape, and the cathode plate 25 is connected with the cathode core column 2 through a lead sleeve 27 and is positioned inside the tube shell 1; the cathode assemblies 3 are arranged on the bottom surface of the cathode plate 25, a plurality of cathode assemblies are arranged around the axis arc array of the tube shell 1, and the cathode assemblies 3 are electrically connected with the cathode core column 2; the anode assembly 4 is fan-shaped and is arranged opposite to the cathode assembly 3, and the anode assembly 4 is fixed on the tube shell 1; the cooling assembly 5 is fixed at the bottom of the anode assembly 4 and used for cooling the anode assembly 4; when emitting radiation, the cathode assembly 3 of negative high voltage emits an electron beam toward the grounded anode assembly 4, and the generated radiation is emitted from the emission window 11.

The X-ray tube has a multi-cathode structure, adopts a mode of cathode negative high voltage and anode grounding, the X-ray tubes are arranged in groups, the cathodes of the adjacent X-ray tubes are opposite and are isolated by the ceramic sheet 6, therefore, the problem of high voltage insulation is not caused, and the cathodes can be arranged at the position close to the tube shell 1, thereby realizing the focus paying-off in a full angle.

The top and the bottom of tube 1 are open type, and top apron 12 is equipped with at the top, and bottom apron 13 is equipped with at the bottom, and negative pole stem 2 is fixed on top apron 12, and positive pole subassembly 4 is fixed on bottom apron 13, and top apron 12 makes things convenient for the installation of negative pole stem 2 and negative pole subassembly 3, and bottom apron 13 makes things convenient for the installation of positive pole subassembly 4 and cooling module 5.

Cathode plate 25 facilitates the installation of cathode assembly 3 and facilitates the installation of cathode assembly 3 in an arcuate array, cathode plate 25 being connected to cathode stem 2 by lead sleeve 27.

The arc array is arranged along the same arc line at equal intervals.

As shown in fig. 2 to 6, the cathode stem 2 includes: a stem 21, a stem ceramic 20, an inner ring kovar 22, a cathode ceramic 23 and an outer ring kovar 24; the stem 21 is electrically connected with the cathode component 3; the core column 21 is fixed on the core column ceramic 20, and the core column ceramic 20 is fixed in the inner ring kovar 22; the inner ring kovar 22 is fixed on the cathode ceramic 23; the cathode ceramic 23 is fixed to an outer ring valve 24, which outer ring valve 24 is fixed to the top cover plate 12 of the tube housing 1.

The lead sleeve 27 is a metal tube, and the lead sleeve 27 is connected to the inner ring kovar 22 and the cathode plate 25, respectively.

The stem 21 and the inner ring kovar 22 have negative pressure, the outer ring kovar 24 is grounded, and the stem 21, the inner ring kovar 22 and the outer ring kovar 24 are insulated by the cathode ceramic 23. The cathode ceramic 23 is fixed to the top cover plate 12 and effects high voltage insulation of the stem 21 from the top cover plate 12.

The connecting kovar ring 7, the inner ring kovar 22 and the outer ring kovar 24 are all made of kovar alloy.

The cathode assembly 3 includes: grid ceramic 33, grid 31, and filament 32; the grid ceramic 33 is fixed on the cathode plate 25; the grid 31 is fixed on the grid ceramic 33; the filament 32 is mounted on the cathode plate 25.

The grid 31 and the filament 32 are connected to pins on the stem 21 by leads, respectively.

The cathode plate 25 is also provided with a lead cover 26 for protecting the lead.

In operation, the cathode is loaded with a high voltage and the anode is grounded, while the filament 32 is heated to produce a free electron cloud. By adjusting the grid voltage of the grid 31 relative to the filament 32, the electric field near the filament 32 can be controlled to switch the electron beam, thereby realizing the emission and cut-off of the X-ray. By sequentially switching the voltages of the gates 31 of the multiple cathodes, the round exposure of the focal points at different positions can be realized. Further, by appropriately adjusting the gate voltage of the gate electrode 31, the switching of the large and small focal points can be realized.

As shown in fig. 8, the anode assembly 4 includes: a target disk 41, a base body 42, and a radiation shield 43; the target disk 41 is fan-shaped and is obliquely arranged towards the emission window 11; the base body 42 is in a fan-shaped ring shape, the target disc 41 is fixed on the top of the base body 42, the top of the base body 42 is obliquely arranged towards the emission window 11, the base body 42 is fixed on the tube shell 1 through the bottom cover plate 13, and the cooling component 5 is fixed on the bottom of the base body 42 through the bottom cover plate 13; the radiation shielding cover 43 is in the shape of a fan ring and is mounted on the outer side of the base body 42 for shielding radiation outside the emission window 11, i.e. the shielding cover 43 is used for shielding radiation not emitted towards the emission window 11. The electron beam bombardment site at the target disk is the X-ray source, and besides the emission window 11 emitting X-rays, the X-ray source also emits towards other directions above the target disk. Except for useful X-rays emitted from the emission window 11, the remaining directions are useless rays and lead is generally used for shielding in the tube assembly. The addition of a shield to the proximal source can shield some of the unused X-rays here, and can reduce the lead weight of the tube assembly by using less material than at the (distal) end of the tube assembly.

As shown in fig. 8, the cross-section of the radiation shield 43 is L-shaped, which effectively shields the radiation from the near-radiation source end, thereby effectively reducing the amount of radiation shielding metal used for the tube case 1 and the weight of the whole tube assembly.

The target plate 41 is made of rhenium-tungsten alloy or tungsten. Base member 42 adopts the copper product, possesses good coefficient of heat conductivity, promotes the radiating efficiency.

The radiation shield 43 can effectively shield X-rays at the near X-ray source side. X-ray tubes typically employ lead metal for X-ray shielding in the tube assembly housing, the high density of lead resulting in a high overall tube assembly weight. And the ray shielding cover 43 is a shell, which can effectively shield the X-ray, reduce the using amount of the ray shielding metal and reduce the weight of the whole tube assembly. The radiation shield 43 may be made of tungsten, tungsten copper, or the like.

As shown in fig. 1, the cooling module 5 includes: a cooling disc 51 and a quick coupling 52, wherein the cooling disc 51 is a hollow disc, and the cooling disc 51 is fixed at the bottom of the anode assembly 4; quick couplings 52 are fixed to both ends of the cooling plate 51.

The quick connector 52 is convenient to connect, the cooling liquid can be oil or water, and the liquid cooling mode greatly improves the continuous input power.

In some embodiments, as shown in FIG. 9, the bottom surface of the cooling plate 51 is provided with a plurality of heat dissipating grooves 511. The heat radiating grooves 511 increase a heat radiating area, thereby improving heat radiating efficiency.

When the cathode assembly works, electron beams are emitted from the cathode assembly 3 and bombarded on the target disc 41 of the anode assembly 4 under the action of a cathode and anode high-voltage electric field, and generated rays are emitted from the emission window 11; at the same time, the heat generated is carried away by the cooling liquid flowing through the cooling module 5.

Example two

The annular ray device comprises a plurality of all-angle arc-shaped array X-ray tubes, and the plurality of all-angle arc-shaped array X-ray tubes form a ring.

A plurality of independent X-ray tubes are connected into a circular ring, so that the assembly is convenient, and the replacement is convenient.

A plurality of full-angle arc array X-ray tubes can form a ring structure according to the arrangement shown in fig. 10 and 11, and the cooling liquid inlet and the cooling liquid outlet of the plurality of full-angle arc array X-ray tubes adopt a quick connector 52 structure, so that the plurality of full-angle arc array X-ray tubes can be quickly inserted and pulled out, and the assembly and the disassembly are convenient. The quick couplings 52 of adjacent X-ray tubes are connected in series and ultimately connected to a heat sink.

In some embodiments, the ceramic electronic device further comprises a flexible insulating board 9 having insulating property and elasticity, wherein the flexible insulating board 9 is located between two adjacent ceramic sheets 6 and has no air between the two ceramic sheets 6.

The X-ray tube further comprises a connecting seat 81, a connecting plate 82 and connecting screws 83, wherein the connecting seat 81 and the connecting plate 82 are respectively fixed at two ends of the tube shell 1, and the connecting screws 83 are respectively connected with the connecting seat 81 and the connecting plate 82 and used for fixing adjacent full-angle arc array X-ray tubes together.

The screw structure is used for compressing, so that air between the ceramic plates 6 of the two X-ray tubes is extruded, the insulating property is improved, and the high-voltage insulating property is ensured; meanwhile, the distance between the two X-ray tubes can be reduced by screwing.

In some embodiments, a first deflection coil 85 and a second deflection coil 86; a first deflection coil 85 is installed on the inner circumferential surface of the ring-shaped ray device and corresponds to the cathode of the tube body; a second deflection coil 86 is mounted on the inner circumferential surface of the ring-shaped ray device and corresponds to the anode of the tube body;

the second deflection coil 86, the first deflection coil 85 and the ring ray device are coaxially arranged, and the current direction of the first deflection coil 85 is opposite to that of the second deflection coil 86.

The first deflection coil 85 and the second deflection coil 86 are located on both sides of the emission window 11.

The two annular coils are used for generating a magnetic field perpendicular to the advancing direction of the electron beams, and deflection of the electron beams in the annular direction is realized through the magnetic field, so that the number of focuses is increased, and better scanning imaging quality is realized.

Specifically, the whole annular structure is provided with two magnetic deflection coils, and current in opposite directions is conducted. The two deflection coils are opposite in current, so that the magnetic fields in the same direction are generated in the space between the two deflection coils, as shown in fig. 12, the first deflection coil 85 is energized with a clockwise current, and the second deflection coil is energized with a counterclockwise current, so that the magnetic field pointing perpendicularly to the emission window 11 can be generated; if the currents are each passed in the opposite direction, a magnetic field is generated in a direction perpendicular to and away from the emission window 11. The magnetic field may affect the electron beam emitted from the cathode to the anode to deflect it in a circular direction, thereby creating a focus that deviates from the original landing point. By adjusting the strength and direction of the magnetic field, the focuses with different falling points can be generated, namely, the number of the focuses is generated to be multiple relative to the number of the cathodes. In this way, the X-ray tube can generate more focuses, thereby improving the quality of tomography imaging.

The technical principle of the present invention is described above in connection with specific embodiments. The description is made for the purpose of illustrating the principles of the invention and should not be construed in any way as limiting the scope of the invention. Based on the explanations herein, those skilled in the art will be able to conceive of other embodiments of the present invention without inventive step, which shall fall within the scope of the appended claims.