CN118197884A - Tube core assembly for X-ray tube and X-ray tube - Google Patents

Abstract

A tube core assembly for an X-ray tube and the X-ray tube, wherein the tube core assembly comprises a cathode assembly and an anode assembly, the cathode assembly comprises a cathode bottom plate, the cathode bottom plate is provided with a cavity, and a cooling liquid is arranged in the cavity; the cathode head is fixedly arranged on the cathode bottom plate and used for emitting electron beams; the anode assembly includes: an anode target disk, the electron beam being used to bombard the anode target disk; the central shaft penetrates through the anode target disk, the central shaft is provided with a first end and a second end along the axial direction, the first end is fixedly connected with the cathode bottom plate, the central shaft is provided with a hollow structure extending along the axial direction, and the hollow structure is communicated with the cavity for cooling liquid circulation; the outer bearing is sleeved on the central shaft and can rotate around the axial direction of the central shaft, and the outer bearing is connected with the anode target disk to drive the anode target disk to rotate. The scheme can improve the heat dissipation effect of the anode target disc and the outer bearing, avoid overheating of the bearing, further improve the heat dissipation effect of the anode target disc, and improve the reliability of the bearing and the tube core assembly.

Description

Tube core assembly for X-ray tube and X-ray tube

Technical Field

The embodiment of the invention relates to the technical field of X-ray tubes, in particular to a tube core assembly for an X-ray tube and the X-ray tube.

Background

Vacuum X-ray tubes (also known as X-ray tubes, X-ray tubes) operate, and electron beams emitted by filaments in a cathode assembly strike an anode target disk under the action of a high voltage electric field. When the electron beam bombards the target disk, the heat energy of the target disk is instantaneously stored in the graphite of the anode target disk, most of electrons are absorbed by the target disk and converted into heat energy, and only a small part of the energy of the electron beam is converted into X-rays. For rotating anode X-ray tubes employing bearings (e.g., ball bearings), the heat from the anode target disk is transferred to the bearings by contact and the heat transferred to the bearings is dissipated off-die by radiative heat transfer. However, the heat dissipation efficiency of the current bearing is low, which easily causes overheating of the bearing, and the overheating of the bearing affects the reliability of the bearing, and thus the reliability of the pipeline assembly and the X-ray tube.

Disclosure of Invention

The technical problem solved by the embodiment of the invention is that the heat dissipation efficiency of the bearing in the current X-ray tube is low, the bearing is easy to overheat, the reliability of the bearing is affected by the overheat of the bearing, and the reliability of the pipeline assembly and the X-ray tube is further affected.

To solve the above technical problem, an embodiment of the present invention provides a die assembly for an X-ray tube, including: a cathode assembly, comprising: the cathode bottom plate is provided with a cavity, and cooling liquid is arranged in the cavity; the cathode head is fixedly arranged on the cathode bottom plate and used for emitting electron beams; an anode assembly, comprising: an anode target disk, the electron beam being used to bombard the anode target disk; the central shaft penetrates through the anode target disk, the central shaft is provided with a first end and a second end along the axial direction, the first end is fixedly connected with the cathode bottom plate, the central shaft is provided with a hollow structure extending along the axial direction, and the hollow structure is communicated with the cavity so as to enable the cooling liquid to circulate; the outer bearing is sleeved on the central shaft and can rotate around the axial direction of the central shaft, and the outer bearing is connected with the anode target disk to drive the anode target disk to rotate.

Optionally, a cooling liquid flow channel is arranged in the cavity, the cathode bottom plate is provided with a first opening communicated with the cooling liquid flow channel, and the first opening is used for communicating the hollow structure with the cavity.

Optionally, the cathode bottom plate is provided with a connecting portion, and the connecting portion surrounds the first opening and is used for fixedly connecting with the central shaft.

Optionally, the connecting portion is disposed on the first surface of the cathode bottom plate, the connecting portion is a protruding rib protruding from the first surface, and the first surface of the cathode bottom plate faces the anode target plate.

Optionally, a plurality of cooling fins are disposed in the cooling liquid flow channel, and the plurality of cooling fins are connected to the cathode bottom plate.

Optionally, the first surface of the cathode base plate facing the anode target disk has the same potential as the anode target disk.

Optionally, the die assembly further includes a die housing having a receiving cavity, at least a portion of the cathode base plate and the anode assembly are located in the receiving cavity, the second end is fixed to the die housing, and the second end is an open end to draw out the cooling liquid in the hollow structure.

Optionally, a part of the cathode bottom plate is located outside the accommodating cavity, a part of the cathode bottom plate located outside the accommodating cavity is provided with a cooling liquid outlet communicated with the cooling liquid channel, and the cooling liquid output through the cooling liquid outlet is used for cooling an X-ray window arranged on the tube core shell.

Optionally, the cathode bottom plate has at least one pair of coolant outlets, and two coolant outlets in each pair of coolant outlets are symmetrically arranged along a center line of the X-ray window.

Optionally, an isolating part is arranged between the two cooling liquid outlets, and the isolating part is positioned in the cavity and is used for isolating the two cooling liquid outlets.

Optionally, the two cooling liquid outlets are respectively provided with a guiding part, and the guiding part arranged at one cooling liquid outlet is used for guiding the flowing cooling liquid to flow towards the direction of the other cooling liquid outlet.

Optionally, the inner wall of the hollow structure is provided with a diversion trench, and the diversion trench is used for guiding the cooling liquid to flow between the first end and the second end.

Optionally, a central hole is formed in a central area of the anode target disc, the central shaft penetrates through the anode target disc through the central hole, and a first gap which is different from zero is formed between the central shaft and the central hole.

Optionally, the anode target plate has a hollow connecting shaft, the connecting shaft is connected with the outer bearing and extends along the axial direction of the central shaft towards and away from the cathode bottom plate, and a second gap which is not zero is arranged between the connecting shaft and the central shaft.

The invention also provides an X-ray tube comprising any of the above-mentioned die assemblies for an X-ray tube.

Compared with the prior art, the technical scheme of the embodiment of the invention has the following beneficial effects:

The first end of center pin fixed connection is in the negative pole bottom plate, and the hollow structure that extends along the axial through the center pin can communicate with the cavity of negative pole bottom plate, thereby because be provided with the coolant liquid in the cavity so can supply coolant liquid to circulate between hollow structure and cavity. Because the center pin is connected with the anode target disk, the cooling liquid is further used for cooling the center shaft, the heat dissipation effect of the center shaft and the outer bearing is improved, the overheating of the bearing formed by the center shaft and the outer bearing is avoided, the heat dissipation effect of the anode target disk is further improved, and the reliability of the center shaft, the outer bearing and the tube core assembly is improved. When the die assembly is used for an X-ray tube, the reliability of the X-ray tube can be improved by improving the reliability of the die assembly.

Drawings

FIG. 1 is a schematic structural view of a die assembly for an X-ray tube in accordance with an embodiment of the present invention;

FIG. 2 is a front view of FIG. 1;

FIG. 3 is a cross-sectional view taken along section line A-A of FIG. 1;

FIG. 4 is a front view of FIG. 3;

FIG. 5 is an enlarged view of a portion of FIG. 4 at B;

fig. 6 is a schematic view of a portion of a die assembly for an X-ray tube in accordance with an embodiment of the present invention at a viewing angle;

fig. 7 is a schematic view of a portion of a die assembly for an X-ray tube in accordance with an embodiment of the present invention at another viewing angle.

Detailed Description

As described above, for a rotating anode X-ray tube employing a bearing (e.g., a ball bearing), heat from the anode target disk is transferred to the bearing by contact, and heat transferred to the bearing is dissipated off-die by radiative heat transfer, e.g., heat from the bearing is transferred by anode rotor radiation to off-die heat dissipation. However, the heat dissipation efficiency of the current bearing is low, which easily causes overheating of the bearing, and the overheating of the bearing affects the reliability of the bearing and the reliability of the X-ray tube.

In order to solve the above problem, the first end of the central shaft is fixedly connected to the cathode bottom plate, and the hollow structure extending along the axial direction of the central shaft can be communicated with the cavity of the cathode bottom plate. Because the center pin is connected with the anode target disk, the cooling liquid is further used for cooling the center shaft, the heat dissipation effect of the center shaft and the outer bearing is improved, the overheating of the bearing formed by the center shaft and the outer bearing is avoided, the heat dissipation effect of the anode target disk is further improved, and the reliability of the center shaft, the outer bearing and the tube core assembly is improved. When the die assembly is used for an X-ray tube, the reliability of the X-ray tube can be improved by improving the reliability of the die assembly.

In order to make the above objects, features and advantages of the embodiments of the present invention more comprehensible, the following detailed description of the embodiments of the present invention refers to the accompanying drawings.

An embodiment of the present invention provides a die assembly for an X-ray tube (hereinafter referred to as a die assembly), referring to fig. 1 to 7, the die assembly 100 includes: cathode assembly 1 and anode assembly 2. The cathode assembly 1 includes: cathode base plate 11 and cathode head 12. The cathode base plate 11 has a cavity 111, and a coolant is disposed in the cavity 111. The cathode head 12 is fixedly arranged on the cathode bottom plate 11, and the cathode head 12 is used for emitting electron beams. The anode assembly 2 includes an anode target disk 21, a central shaft 22, and an outer bearing 23. The electron beam is used to bombard the anode target disk 21. The central shaft 22 penetrates through the anode target plate 21, the central shaft 22 is provided with a first end 221 and a second end 222 along the axial direction, the first end 221 is fixedly connected to the cathode bottom plate 11, the central shaft 22 is provided with a hollow structure 223 extending along the axial direction, and the hollow structure 223 is communicated with the cavity 111 for the circulation of the cooling liquid; the outer bearing 23 is sleeved on the central shaft 22 and can rotate around the axial direction of the central shaft 22, and the outer bearing 23 is connected with the anode target disk 21 to drive the anode target disk 21 to rotate.

As can be seen from the above, the first end 221 of the central shaft 22 is fixedly connected to the cathode base plate 11, and the hollow structure 223 extending in the axial direction through the central shaft 22 can communicate with the cavity 111 of the cathode base plate 11, and the cooling liquid can flow between the hollow structure 223 and the cavity 111 due to the cooling liquid disposed in the cavity 111. Since the center shaft 22 is connected to the anode target disk 21, the cooling of the center shaft 22 by the coolant is further realized, the heat radiation effect on the center shaft 22 and the outer bearing 23 is improved, the overheating of the center shaft 22 and the outer bearing 23 is avoided, the heat radiation effect on the anode target disk 21 is further improved, and the reliability of the center shaft 22, the outer bearing 23 and the die assembly 100 is improved. When the die assembly 100 is used in an X-ray tube, the reliability of the X-ray tube may be improved by improving the reliability of the die assembly 100.

In addition, by increasing the heat radiation effect of the central shaft 22, the temperature of the central shaft 22 is reduced, and thus the temperature of the anode target plate 21 is reduced, the influence of X-ray focus shift on imaging due to thermal expansion of the prototype can be greatly reduced.

In some embodiments, the cooling fluid may be cooling oil, cooling water, or the like. Further, the cooling liquid may be insulating cooling oil.

In some embodiments, balls 27 are disposed between the outer bearing 23 and the central shaft 22. The number of balls 27 is plural. The rotation of the outer bearing 23 relative to the central shaft 22 is assisted by the provision of balls 27. The central shaft 22, the balls 27 and the outer bearing 23 may constitute bearings. The central shaft 22 may be referred to as a bearing inner ring or an inner bearing, and the outer bearing 23 may be referred to as a bearing outer ring.

Further, an annular first groove is provided on the outer bearing 23, the central shaft 22 is provided with an annular second groove, the first groove and the second groove are respectively opened towards each other, that is, the first groove is opened towards the second groove, the second groove is opened towards the first groove, and the first groove and the second groove are matched to form a ball accommodating groove, wherein the ball 27 is positioned in the ball accommodating groove.

Further, at least two ball receiving grooves are provided along the axial direction of the outer bearing 23 to improve the stability of the outer bearing 23 when rotating with respect to the central shaft 22.

In some embodiments, the outer part of the outer bearing 23 may be fixedly connected with the anode rotor 4, the anode rotor 4 cooperates with the stator to realize rotation, and the rotation of the anode rotor 4 drives the outer bearing 23 to rotate.

In a specific implementation, a cooling fluid flow channel 112 is disposed in the cavity 111, and the cathode bottom plate 11 is provided with a first opening 113 that is in communication with the cooling fluid flow channel 112, and the first opening 113 is used for communicating the hollow structure 223 with the cavity 111.

In some non-limiting embodiments, the coolant flow channels 112 may be unidirectional flow channels.

In some embodiments, the cathode base plate 11 is provided with a connecting portion 114, the connecting portion 114 surrounding the first opening 113, and the connecting portion 114 is used for fixedly connecting the central shaft 22.

In some non-limiting embodiments, the connection 114 and the central shaft 22 may be fixedly connected by various suitable means, such as welding (e.g., brazing), bonding, etc. It should be understood that the connection portion 114 and the central shaft 22 may be fixedly connected in other suitable manners, so long as the sealing performance of the connection portion 114 and the central shaft 22 after connection is satisfied, so as to ensure that the cooling liquid cannot leak, and other fixing connection manners of the connection portion 114 and the central shaft 22 are not illustrated here.

The connecting portion 114 is disposed on the first surface 115 of the cathode base plate 11, the connecting portion 114 is a rib protruding from the first surface 115, and the first surface 115 of the cathode base plate 11 faces the anode target plate 21.

The central shaft 22 is fixedly connected to the ribs. For example, the central shaft 22 is fixedly attached to the ribs by suitable attachment means such as welding (e.g., brazing) or bonding. The central shaft 22 may be fixedly connected to the inner surface of the bead or may be fixedly connected to the outer surface of the bead.

In other non-limiting embodiments, the connecting portion 114 may also be a recess disposed on the first surface 115. The central shaft 22 is fixedly connected to the wall surface of the recess.

In particular implementations, cathode base plate 11 also includes a second surface 119 disposed opposite first surface 115. The second surface 119 may have a second opening provided therein for connecting the coolant line 1191. One of the first opening 113 and the second opening serves as an inlet of the cooling liquid, and the other serves as an outlet of the cooling liquid. For example, the coolant enters the cavity 111 to the second opening, flows in the coolant flow passage 112, and enters the hollow structure 223 of the center shaft 22 via the first opening 113. As another example, the cooling fluid enters the cavity 111 from the hollow structure 223 of the central shaft 22 via the first opening 113, flows under the direction of the cooling fluid flow passage 112, and flows out from the second opening.

In some non-limiting embodiments, the motive force for the flow of the cooling fluid may be provided by a pump.

In some embodiments, the first surface 115 of the cathode base plate 11 facing the anode target disk 21 has the same potential as the anode target disk 21.

For example, the first surface 115 is grounded to the anode target disk 21.

The surface of the cathode base plate 11 facing the anode target disk 21 is grounded, i.e., the potential is zero. The potential difference between the cathode head 12 and the anode target disk 21 forms a high voltage electric field. The electron beam emitted from the cathode filament of the cathode head 12 is driven by the high-voltage electric field to the target surface (which may also be referred to as an electron orbit) of the anode target disk 21. Some of the electrons in the electron beam are absorbed by the anode target disk 21 after striking the target surface of the anode target disk 21 for the first time, and other part of the electrons are reflected by the anode target disk 21 after striking the target surface of the anode target disk 21, and under the action of the high-voltage electric field, some of the electrons reflected by the target surface of the anode target disk 21 are scattered to the first surface 115 of the cathode base plate 11 having the same electric potential as the anode target disk 21 and absorbed by the first surface 115, so that the number of electrons absorbed by the anode target disk 21 can be reduced, and the heat of the anode target disk 21 can be reduced. The cooling liquid in the cavity 111 can cool the first surface 115, so as to improve the heat dissipation effect of the first surface 115.

In some embodiments, the potential of cathode head 12 is a negative potential to create a high voltage electric field between cathode head 12 and anode target disk 21. In this manner, the cathode head 12 is a single stage electrode design, which may simplify the structure of the die assembly 100 and reduce the cost of the X-ray tube. For example, the potential of the cathode head 12 is-150 kv. It will be appreciated that the potential of the cathode head 12 may be configured to other values as desired, and is not limited herein.

In a specific implementation, the cathode assembly 1 includes a cathode cover 13 covering the cathode head 12, the cathode cover 13 is insulated, and an outer surface of the cathode cover 13 is coated with a semiconductor coating. The semiconductor coating can play an insulating effect and simultaneously can also guide electrons out of the cathode cover 13, so that the electrons are prevented from accumulating on the cathode cover 13.

In some non-limiting embodiments, the cathode housing 13 may be made of ceramic materials, so that the cathode housing 13 has better insulation properties and better strength and heat resistance.

In some embodiments, the cathode assembly 1 may further include a metal flange 14, where the metal flange 14 is sleeved on the cathode cover 13 and is connected to the semiconductor coating, and the metal flange 14 is grounded. Since the metal flange 14 is connected with the semiconductor coating and the metal flange 14 is grounded, electrons on the semiconductor coating are conveniently led out, and electrons are prevented from accumulating on the cathode cover 13.

In some embodiments, the metal flange 14 is sleeved on the cathode cover 13 and connected with the semiconductor coating, which means that the metal flange 14 is adjacent to the semiconductor coating without a gap between the metal flange and the semiconductor coating.

In other embodiments, the metal flange 14 is sleeved on the cathode cover 13 and connected with the semiconductor coating, which means that the metal flange 14 is at least partially pressed against the semiconductor coating, that is, at least part of the metal flange 14 is sleeved outside the semiconductor coating.

In a specific implementation, the cathode assembly 1 further includes a cathode housing 15, where the cathode housing 15 is sleeved on the cathode cover 13 and is connected to the metal flange 14 and the cathode bottom plate 11.

In some embodiments, a plurality of cooling fins 116 are disposed within the cooling fluid flow channel 112, and the plurality of cooling fins 116 are connected to the cathode base plate 11.

The plurality of cooling fins 116 protrude from the bottom surface of the cooling liquid flow channel 112 to increase the heat exchange area between the cooling liquid and the cathode bottom plate 11, thereby improving the heat convection heat exchange effect and further improving the cooling effect of the cooling liquid on the cathode bottom plate 11.

The plurality of fins 116 may have a variety of suitable shapes such as cubic, cuboid, conical, rhombohedral, spherical, and the like.

The plurality of fins 116 may be uniformly arranged in the coolant flow field 112 or may be unevenly arranged in the coolant flow field 112.

At least some of the plurality of fins 116 extend in a direction different from the direction in which the coolant flow channels 112 extend. In this way, when the cooling liquid flows in the cooling liquid flow channel 112, the plurality of cooling fins 116 can have a disturbing effect on the cooling liquid, so that the cooling liquid flows in the cooling liquid flow channel 112 in a turbulent (also called turbulent) manner, thereby further improving the heat exchange effect between the cooling liquid and the cathode bottom plate 11 and avoiding overheating of the cathode bottom plate 11.

The heat sink 116 may be integrally formed with the cathode base plate 11. For example, the heat sink 116 is integrally formed with the cathode base plate 11. The heat sink 116 may also be attached to the cathode base plate 11 by welding (e.g., brazing, etc.) or bonding, etc.

The die assembly 100 further comprises a die housing 3, the die housing 3 has a receiving cavity 31, at least a portion of the cathode bottom plate 11 and the anode assembly 2 are located in the receiving cavity 31, the second end 222 is fixed on the die housing 3, and the second end 222 is an open end to draw out the cooling liquid in the hollow structure 223. Thus, circulation of the coolant in and out of the cavity 111 and the center shaft 22 can be realized, and the overall heat dissipation effect of the pair of pipe assemblies 100 can be improved.

Further, since the first end 221 of the central shaft 22 is fixedly connected to the cathode bottom plate 11 and the second end 222 is fixedly connected to the tube core shell 3, fixing of two ends of the central shaft 22 can be achieved, a double-point support cantilever structure for the anode target disk 21 is formed while rotation of the anode target disk 21 is not affected, stability of the anode target disk 21 is improved, probability of X-ray focus deviation when the anode target disk 21 increases rotation speed is reduced, and imaging quality is ensured.

A part of the cathode bottom plate 11 is located outside the accommodating cavity 31, a cooling liquid outlet 117 communicated with the cooling liquid flow channel 112 is disposed at a part of the cathode bottom plate 11 located outside the accommodating cavity 31, and the cooling liquid output through the cooling liquid outlet 117 is used for cooling the X-ray window 32 disposed on the die shell 3.

The cathode base plate 11 has at least one pair of coolant outlets 117, and when the shape of the X-ray window 32 is centrosymmetric, two coolant outlets 117 of each pair of coolant outlets 117 are symmetrically arranged along the center line of the X-ray window 32.

In some non-limiting embodiments, the coolant outlets 117 are a pair, i.e., the number of coolant outlets 117 is two. An isolating part is arranged between the two cooling liquid outlets 117, and is positioned in the cavity 111, so as to isolate the two cooling liquid outlets 117, thereby ensuring the flow of the cooling liquid flowing out of the cooling liquid outlets 117.

The two coolant outlets 117 are provided with guide portions 1171, respectively, and the guide portion 1171 provided for one of the coolant outlets 117 serves to guide the flowing-out coolant toward the other coolant outlet 117. Typically, the central region of the X-ray window 32 is hottest, and relatively more cooling liquid can be guided to flow through the central region of the X-ray window 32 by the guide portion 1171, so as to improve the heat dissipation effect on the X-ray window 32.

In some embodiments, the coolant outlets 117 are prismatic in shape, one corner of the prism may serve as a guide 1171, and the distance between the two coolant outlets 117 becomes smaller as approaching the anode target disk 21, so that the coolant converges and flows out from the guide 1171.

In a specific implementation, the inner wall of the hollow structure 223 is provided with a guiding groove, which is used for guiding the cooling liquid to flow between the first end 221 and the second end 222. The sufficient contact between the coolant and the inner wall of the hollow structure 223 can be improved by the diversion trench, and the cooling effect of the coolant on the center shaft 22 can be improved.

In some embodiments, the flow channels may be distributed along the axial direction of the hollow structure 223, i.e. the direction of extension of the flow channels is parallel to the axial direction of the hollow structure 223.

In other embodiments, the channels may be layered helically around the axial direction of the hollow structure 223.

In a specific implementation, the central area of the anode target disk 21 is provided with a central hole 211, the central shaft 22 penetrates through the anode target disk 21 through the central hole 211, and a first gap 24 which is not zero is arranged between the central shaft 22 and the central hole 211. During rotation of the anode target disk 21, interference between the anode target disk 21 and the central shaft 22 is avoided by the first gap 24 provided.

In some non-limiting embodiments, the anode target disk 21 has a hollow connecting shaft 25, the connecting shaft 25 being connected to the outer bearing 23, the connecting shaft 25 extending away from the cathode base plate 11 along the axial direction of the central shaft 22, the connecting shaft 25 having a non-zero second gap 26 between the connecting shaft 25 and the central shaft 22. The connection shaft 25 is connected to the anode target plate 21, and heat of the anode target plate 21 is transferred to the connection shaft 25. The second gap 26 can avoid interference between the anode target disk 21 and the center shaft 22 when the anode target disk 21 rotates.

The connection shaft 25 and the anode target disk 21 may be integrally formed. The connecting shaft 25 and the anode target plate 21 may be separate components, and they may be fixedly connected.

In some embodiments, the connecting shaft 25 is made of the same material as the anode target plate 21 to ensure high temperature resistance and strength of the connecting shaft 25. It will be appreciated that the connecting shaft 25 may be made of a material having a high temperature range that is comparable to the operating temperature of the anode target disk 21 (e.g., two thousand to three thousand degrees celsius) and a high strength.

In practice, the center shaft 22 and the outer bearing 23 are typically made of steel, copper, or the like in order to achieve a cost of the die assembly 100. The material cost of the anode target disk 21 is higher than the material cost of the center shaft 22 and the outer bearing 23. The temperature that center pin 22 and outer bearing 23 can bear is lower than the temperature when anode target dish 21 works, realizes anode target dish 21 and outer bearing 23 connection through connecting axle 25, can make outer bearing 23 keep certain distance with anode target dish 21, and the heat of anode target dish 21 is conducted to outer bearing 23 and center pin 22 through connecting axle 25 with modes such as heat radiation, can compromise the high temperature bearing ability and the cost of center pin 22 and outer bearing 23.

The connecting shaft 25 is fixedly connected with the outer bearing 23. For example, the fixing connection may be performed by a fastener such as a screw, or may be performed by welding, which is not limited herein.

In a specific implementation, the outer surface of the central shaft 22 facing the connecting shaft 25 is coated with a coating having a emissivity of 0.8W/m ² K or more. The heat radiation effect of the anode target disk 21 to the central shaft 22 can be enhanced through the arranged coating, so that the heat of the anode target disk 21 is transferred to the central shaft 22 as much as possible and rapidly through the heat radiation, and the cooling liquid in the central shaft 22 can take away more heat on the anode target disk 21, thereby improving the heat radiation effect of the anode target disk 21.

The invention also provides an X-ray tube comprising any of the above-mentioned die assemblies for an X-ray tube.

In the specific implementation, for more description of the specific working principle and structure of the die assembly, reference is made to the description of the die assembly in the foregoing embodiment, which is not repeated herein.

The first, second, etc. descriptions in the embodiments of the present application are only used for illustrating and distinguishing the description objects, and no order is used, nor is the number of the devices in the embodiments of the present application limited, and no limitation on the embodiments of the present application should be construed.

Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the invention, and the scope of the invention should be assessed accordingly to that of the appended claims.

Claims (15)

1. A die assembly for an X-ray tube, comprising:

a cathode assembly, comprising:

the cathode bottom plate is provided with a cavity, and cooling liquid is arranged in the cavity;

the cathode head is fixedly arranged on the cathode bottom plate and used for emitting electron beams;

An anode assembly, comprising:

an anode target disk, the electron beam being used to bombard the anode target disk;

The central shaft penetrates through the anode target disk, the central shaft is provided with a first end and a second end along the axial direction, the first end is fixedly connected with the cathode bottom plate, the central shaft is provided with a hollow structure extending along the axial direction, and the hollow structure is communicated with the cavity so as to enable the cooling liquid to circulate;

The outer bearing is sleeved on the central shaft and can rotate around the axial direction of the central shaft, and the outer bearing is connected with the anode target disk to drive the anode target disk to rotate.

2. The die assembly of claim 1, wherein a coolant flow passage is disposed within the cavity, and the cathode base plate is provided with a first opening in communication with the coolant flow passage, the first opening for communicating the hollow structure with the cavity.

3. The die assembly of claim 2, wherein the cathode base plate is provided with a connecting portion surrounding the first opening for fixedly connecting the central shaft.

4. The die assembly of claim 3, wherein the connection is disposed on a first surface of the cathode base plate, the connection is a bead protruding from the first surface, and the first surface of the cathode base plate faces the anode target disk.

5. The die assembly of claim 2, wherein a plurality of fins are disposed within the coolant flow channel, the plurality of fins being coupled to the cathode base plate.

6. The die assembly of claim 1, wherein a first surface of the cathode base plate facing the anode target disk has the same potential as the anode target disk.

7. The die assembly of claim 1, further comprising a die housing having a receiving cavity, at least a portion of the cathode base plate and the anode assembly being positioned within the receiving cavity, the second end being secured to the die housing and the second end being an open end to direct coolant from the hollow structure.

8. The die assembly of claim 7, wherein a portion of the cathode base plate is located outside the receiving cavity, a portion of the cathode base plate located outside the receiving cavity is provided with a coolant outlet in communication with the coolant flow channel, and coolant output through the coolant outlet is used to cool an X-ray window provided on the die housing.

9. The die assembly of claim 8, wherein the cathode base plate has at least one pair of coolant outlets, and when the X-ray window 32 is centrally symmetrical in shape, two coolant outlets of each pair are symmetrically disposed along a centerline of the X-ray window.

10. The die assembly of claim 9, wherein a spacer is disposed between the two coolant outlets, the spacer being positioned within the cavity for spacing the two coolant outlets.

11. The die assembly of claim 9, wherein the two coolant outlets are each provided with a guide portion, wherein the guide portion of one of the coolant outlets is configured to guide the flowing coolant toward the other coolant outlet.

12. The die assembly of claim 1, wherein an inner wall of the hollow structure is provided with a flow guide groove for guiding the flow of the cooling fluid between the first end and the second end.

13. The die assembly of claim 1, wherein a central region of the anode target disk is provided with a central aperture through which the central shaft extends through the anode target disk, the central shaft and the central aperture having a first gap therebetween that is not zero.

14. The die assembly of claim 13, wherein the anode target disk has a hollow connecting shaft connected to the outer bearing and extending away from the cathode base plate in an axial direction of the central shaft, the connecting shaft having a non-zero second gap with the central shaft.

15. An X-ray tube comprising a die assembly according to any of claims 1 to 14 for an X-ray tube.