CN118098909B

CN118098909B - Tube core assembly for X-ray tube and X-ray tube

Info

Publication number: CN118098909B
Application number: CN202410502214.2A
Authority: CN
Inventors: 刘爽; 李威锋; 刘聪
Original assignee: Kunshan Yiyuan Medical Technology Co ltd
Current assignee: Kunshan Yiyuan Medical Technology Co ltd
Priority date: 2024-04-25
Filing date: 2024-04-25
Publication date: 2024-07-30
Anticipated expiration: 2044-04-25
Also published as: CN118098909A

Abstract

A die assembly for an X-ray tube and an X-ray tube, wherein the die assembly comprises: the anode target disc is provided with a first through hole at the center, and the first through hole extends along a first direction; the rotor is used for driving the anode target disc to rotate, at least one part of the rotor penetrates through the first through hole and protrudes out of the anode target disc, and the part of the rotor protruding out of the anode target disc along the first direction comprises a locking section and a matching section, wherein the locking section is closer to the anode target disc than the matching section; the fixed nut can rotate in a first plane along a second direction so as to be screwed on the matching section, and the first plane is perpendicular to the first direction; the locking part is sleeved on the locking section, and the locking section can rotate unidirectionally relative to the locking section along with the fixing nut along the second direction and limit the rotation of the fixing nut relative to the rotor along the opposite direction of the second direction after the fixing nut stops rotating along the second direction. By adopting the embodiment of the application, the stability and the reliability of the tube core assembly can be enhanced, and the accidental falling-off of the anode target disk is avoided.

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

As an indispensable core component in modern medical imaging technology, the performance and stability of an X-ray tube are directly related to the accuracy of medical diagnosis and the safety of a patient. Among the many X-ray tube types, CT bulbs play a significant role in CT scanning by their unique mechanism of operation. Taking a CT bulb as an example, the CT bulb can be frequently started and stopped in the working process, so that the fixed nut of the anode target disc and the rotor are easy to rotate relatively, even the risk of falling is caused, and the stability and the safety of the CT bulb are seriously influenced.

Specifically, although the conventional anode target plate fixing method can meet the use requirement to a certain extent, limitations of the conventional anode target plate fixing method are prominent when the conventional anode target plate fixing method faces to complex working conditions such as high-speed rotation and sudden stop. Especially after long-term use, the condition that the fixing nut is easy to loosen or even fall off, the axial extrusion force borne by the target disc can be greatly reduced or even completely disappear, the target disc can be directly caused to fall off from the rotor, the damage of the CT bulb tube can be caused, and the damage to the CT frame can be caused. This is clearly a great safety hazard for the patient.

Therefore, a more stable and reliable fixing manner between the fixing nut and the rotor is needed to ensure the stability and safety of the X-ray tube, especially the CT bulb tube, in the working process, so as to provide more accurate and reliable image support for medical diagnosis and ensure the safety of patients.

Disclosure of Invention

The invention solves the technical problem of providing a tube core assembly for an X-ray tube and the X-ray tube, wherein the tube core assembly can realize self-locking of a fixing nut.

To solve the above technical problem, an embodiment of the present invention provides a die assembly for an X-ray tube, including: the anode target plate is provided with a first through hole at the center, and the first through hole extends along a first direction; a rotor for driving the anode target disk to rotate, at least a part of the rotor protruding from the anode target disk through the first through hole, and along the first direction, the part of the rotor protruding from the anode target disk comprises a locking section and a matching section, and the locking section is closer to the anode target disk than the matching section; a retaining nut rotatable in a second direction in a first plane to be screwed to the mating segment, the first plane being perpendicular to the first direction; the locking part is sleeved on the locking section, and the locking section can rotate unidirectionally relative to the locking section along with the fixing nut along the second direction and restrict the rotation of the fixing nut relative to the rotor along the opposite direction of the second direction after the fixing nut stops rotating along the second direction.

Optionally, the rotor further includes a stop section, on the first plane, a cross-sectional area of the stop section is larger than a cross-sectional area of the first through hole, and along the first direction, the locking section is located between the mating section and the stop section, and the anode target disk fixed to the mating section is clamped between the fixing nut and the stop section.

Optionally, the locking portion includes a body and at least one spring piece, the body is seted up along the second through-hole of first direction extension, the outer peripheral face of locking section is provided with a plurality of tooth structures, every the spring piece is followed the body is towards the second through-hole stretches out and with stretch into the second through-hole the tooth structure looks butt of locking section.

Optionally, the number of tooth structures is greater than the number of leaf springs.

Optionally, the tooth structure includes relative first face and second face, the locking section is followed when fixation nut rotates along the second direction, at least one spring piece is in proper order passed through a plurality of first face, after fixation nut stops rotating, at least one spring piece stretches into between the adjacent the tooth structure.

Optionally, the inclination of the first face with respect to the radial direction of the locking section is greater than the inclination of the second face with respect to the radial direction of the locking section.

Optionally, in the process that the spring piece moves along the second direction along with the fixing nut relative to the first surface, one end of the spring piece, which is close to the first surface, is bent towards a direction away from the locking section under the action of the first surface.

Optionally, the at least one spring piece is arranged around the second through hole, and an extension trend of the at least one spring piece is consistent with a direction opposite to the second direction.

Optionally, at least one mounting groove is formed in the inner wall of the second through hole, the at least one mounting groove corresponds to the at least one spring piece one by one, and at least one part of the spring piece is inserted into the corresponding mounting groove.

Optionally, the thickness of the spring plate is uniform for each of the at least one spring plate.

Optionally, the thickness of the spring piece accommodated in one side of the mounting groove is greater than the thickness of one side close to the locking section.

Optionally, the fixing nut is provided with at least one protruding portion protruding toward the locking portion, at least one receiving portion is formed on the locking portion, the at least one receiving portion corresponds to the at least one protruding portion one by one, and the protruding portion can be inserted into the corresponding receiving portion to enable movement of the fixing nut and movement of the locking portion to be synchronous.

Optionally, an annular boss is disposed on a surface of the fixing nut facing the locking portion, an annular groove for receiving the annular boss is disposed on the locking portion, and a shape of the annular groove is adapted to a shape of the annular boss.

Optionally, the anode target disc includes a recess portion, the recess portion is recessed from the anode target disc toward the surface of the fixing nut toward a direction away from the fixing nut and is communicated with the first through hole, and at least a portion of the locking portion is accommodated in the recess portion.

Optionally, the anode target disc includes a recess portion, the recess portion is recessed from the anode target disc toward the surface of the fixing nut toward a direction away from the fixing nut and is communicated with the first through hole, and at least a portion of the fixing nut is accommodated in the recess portion.

Optionally, the die assembly further includes a graphite ring structure disposed on a side of the anode target disk facing away from the fixing nut.

To solve the above technical problem, an embodiment of the present invention further provides an X-ray tube, including any one of the die assemblies for an X-ray tube described above.

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

an embodiment of the present invention provides a die assembly for an X-ray tube, comprising: the anode target plate is provided with a first through hole at the center, and the first through hole extends along a first direction; a rotor for driving the anode target disk to rotate, at least a part of the rotor protruding from the anode target disk through the first through hole, and along the first direction, the part of the rotor protruding from the anode target disk comprises a locking section and a matching section, and the locking section is closer to the anode target disk than the matching section; a retaining nut rotatable in a second direction in a first plane to be screwed to the mating segment, the first plane being perpendicular to the first direction; the locking part is sleeved on the locking section, and the locking section can rotate unidirectionally relative to the locking section along with the fixing nut along the second direction and restrict the rotation of the fixing nut relative to the rotor along the opposite direction of the second direction after the fixing nut stops rotating along the second direction.

By adopting the technical scheme of the embodiment of the invention, the anode target disk, the rotor, the fixing nut and the locking part are arranged, so that the anode target disk is stably fixed. The locking section and mating section of the rotor are designed so that the rotor can be securely connected to the anode target disk and the retaining nut. The cooperation of locking part and locking section has guaranteed that fixation nut just realizes the auto-lock after screwing to the cooperation section, can not be towards the reverse direction rotation of screwing direction any more, has strengthened the stability and the reliability of tube core subassembly, effectively avoids the unexpected emergence accident that drops of positive pole target dish during the X-ray tube uses (for example, positive pole target dish high-speed rotation or scram time).

Further, the setting of the stop section enables the anode target disk to be clamped between the fixing nut and the stop section, and the fixing effect of the anode target disk is enhanced. The cross section area of the stop section is larger than that of the first through hole, so that the stop section can effectively prevent the anode target disc from moving axially.

Further, the locking portion includes body and spring leaf, through the butt of spring leaf and tooth structure, has realized the locking effect to fixation nut. The body and the spring piece are matched with simple and practical structure, and are convenient to produce and assemble.

Further, the design of the two sides of the tooth structure enables the spring piece to bend smoothly when being pressed and stably abut against the tooth structure. The inclination angle of the first surface and the second surface is designed to enable the spring piece to generate enough deformation when being stressed so as to adapt to the shape of the tooth structure. For example, in the screwing process of the fixing nut, the spring piece is lifted by the tooth structure, and the surface contact between the spring piece and the first surface can effectively avoid the mutual abrasion between parts, so that the service life is prolonged.

Drawings

Fig. 1 is a schematic diagram of a prior art die assembly for an X-ray tube;

Fig. 2 is a schematic diagram of a die assembly for an X-ray tube in accordance with an embodiment of the present invention;

FIG. 3 is a schematic view of the structure of FIG. 2 from another perspective;

FIG. 4 is a schematic illustration of the anode target disk and rotor cooperation of FIG. 2;

FIG. 5 is a schematic view of the retaining nut and locking portion of FIG. 2;

FIG. 6 is an exploded view of the structure shown in FIG. 5;

FIG. 7 is an exploded view of the locking portion of FIG. 6;

FIG. 8 is a schematic view of the retaining nut and locking portion of FIG. 2 mated with a rotor;

FIG. 9 is a cross-sectional view from the perspective A-A of FIG. 8;

figure 10 is a schematic view of the spring leaf and tooth arrangement of figure 9 mated.

Detailed Description

As mentioned in the background, CT bulbs are widely used in the field of medical examination as a typical X-ray tube. Taking the tube core component of the CT bulb tube as an example, when the traditional anode target disc fixing mode faces complex working conditions such as high-speed rotation, emergency stop and the like, the condition that the fixing nut is easy to loosen or even fall off is caused, the axial extrusion force borne by the target disc can be greatly reduced or even completely disappears, the target disc can be directly caused to fall off from the rotor, the CT bulb tube can be damaged, and the CT frame can be damaged.

Specifically, referring to fig. 1, in the tube core assembly of the prior art X-ray tube, after the fixing nut A1 and the rotor A2 are fixed, the anode target disk A3 is clamped in the middle. The rotor A2 and the fixing nut A1 are connected in a threaded fit mode, and when the rotor A2 rotates at a high speed and stops suddenly, the anode target disk A3 and the rotor A2 have a relative rotation trend, namely the fixing nut A1 has a loosening trend. When the fixing nut A1 is loosened or falls, the axial extrusion force from the fixing nut A1 on the anode target disk A3 is reduced or even eliminated, and at the moment, the anode target disk A3 can fall off from the rotor to damage the CT bulb tube (X-ray tube) and the CT frame, and meanwhile, great potential safety hazards can be generated for patients.

To solve the above-mentioned technical problem, an embodiment of the present invention provides a die assembly for an X-ray tube (hereinafter, simply referred to as a "die assembly"), including: the anode target plate is provided with a first through hole at the center, and the first through hole extends along a first direction; a rotor for driving the anode target disk to rotate, at least a part of the rotor protruding from the anode target disk through the first through hole, and along the first direction, the part of the rotor protruding from the anode target disk comprises a locking section and a matching section, and the locking section is closer to the anode target disk than the matching section; a retaining nut rotatable in a second direction in a first plane to be screwed to the mating segment, the first plane being perpendicular to the first direction; the locking part is sleeved on the locking section, and the locking section can rotate unidirectionally relative to the locking section along with the fixing nut along the second direction and restrict the rotation of the fixing nut relative to the rotor along the opposite direction of the second direction after the fixing nut stops rotating along the second direction.

By adopting the technical scheme of the embodiment of the invention, the anode target disk, the rotor, the fixing nut and the locking part are arranged, so that the anode target disk is stably fixed. The locking section and mating section of the rotor are designed so that the rotor can be securely connected to the anode target disk and the retaining nut. The cooperation of locking part and locking section has guaranteed that fixation nut just realizes the auto-lock after screwing to the cooperation section, can not rotate towards the opposite direction of screwing direction any more, has strengthened the stability and the reliability of tube core subassembly, effectively avoids the unexpected emergence accident that drops of positive pole target disk.

The X-ray tube according to the invention is widely used in a number of fields, in particular in the field of medical diagnostics. In the field of medical diagnostics, X-ray tubes are one of the usual imaging examination means for doctors. For example, an X-ray tube may generate X-rays by means of a CT scanner, an X-ray fluoroscope, or the like, and the body part of the patient interacts with an X-ray plate to form images, which are observed by a doctor to determine the condition of the patient. This technique can be used to diagnose lesions in the brain, chest, bones, etc. In addition, in radiotherapy, high-energy X-rays generated by a medical X-ray tube can be used for aiming at tumor tissues for radiotherapy, so that DNA of tumor cells is destroyed, and the effect of killing the tumor cells is achieved.

The principle of generating X-ray in X-ray tube is that the filament of cathode generates heat to generate electron (or electron beam), and a large amount of electrons bombard anode target disk via high-voltage electric field between cathode and anode to generate X-ray, which is reflected by target surface and emitted from window, and then is received by X-ray receiving device (such as CT detector) to image.

In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments accompanied with figures are described in detail below.

Fig. 2 is a schematic diagram of a die assembly 100 for an X-ray tube according to an embodiment of the present invention, and fig. 3 is a schematic diagram of the structure shown in fig. 2 at another viewing angle.

The X-ray tube may include a glass envelope (not shown), a cathode (not shown), a tube core assembly 100, and the like, and the cathode and tube core assembly 100 are typically housed in a vacuum-containing chamber enclosed by the glass envelope.

Referring to fig. 2 and 3, the die assembly 100 may include an anode target disk 1, a rotor 2, a fixing nut 3, and a locking portion 4.

Wherein the anode target disk 1 is used for receiving electron beams emitted from a cathode to generate X-rays. Further, a first through hole 11 is provided in the center of the anode target disk 1, and the first through hole 11 extends along a first direction D1. The first direction D1 may be, for example, a direction in which the fixing nut 3 points toward the anode target disk 1.

The rotor 2 is used for driving the anode target disk 1 to rotate. Therefore, the phenomena that the anode target disk 1 is broken down and the like caused by the fact that electron beams emitted by the cathode bombard the same point on the anode target disk 1 can be avoided, and the service life of the anode target disk 1 is influenced.

Further, at least a portion of the rotor 2 can protrude from the anode target disk 1 through the first through hole 11. In some embodiments, the rotor 2 may be, for example, a rotor of an electromagnetic induction motor (not shown). In the first direction D1, the rotor 2 may include a sensing portion 201 and a driving portion 202. Further, the magnetic induction motor may further include a coil (not shown in the figure) for driving the induction part 201 to rotate, and the induction part 201 further drives the driving part 202 to rotate. Further, the driving part 202 is used for being connected with the anode target disk 1 and driving the anode target disk 1 to rotate synchronously.

In some embodiments, the coil may be sleeved on the sensing portion 201.

In some embodiments, the cross-sectional area of the sensing portion 201 may be greater than the cross-sectional area of the driving portion 202 in a plane perpendicular to the first direction D1.

In some embodiments, the portion of the driving portion 202 near the sensing portion 201 may have a hollow structure, so as to reduce the heat transferred from the anode target disk 1 to the driving portion 202, and avoid the excessive temperature of the driving portion 202 from affecting the normal operation of the magnetic induction motor.

Further, in the first direction D1, the portion of the rotor 2 protruding from the anode target disk 1 includes a locking section 21 and a mating section 22, the locking section 21 being closer to the anode target disk 1 than the mating section 22.

In some embodiments, the outer peripheral surface of the locking section 21 may be formed with a ratchet structure.

Further, the fixation nut 3 is rotatable in a first plane in a second direction D2 to be screwed to said mating segment 22. Wherein the first plane may for example be any plane perpendicular to the first direction D1.

In some embodiments, the fixation nut 3 and the mating segment 22 may be connected by a threaded fit.

Further, the locking portion 4 is sleeved on the locking section 21, and the locking section 21 can rotate unidirectionally relative to the locking section 21 along the second direction D2 along with the fixing nut 3. I.e. the fixation nut 3 is gradually screwed to the mating segment 22 during rotation in the second direction D2. In the process, the locking portion 4 can be rotated with the fixing nut 3 in the second direction D2, and the locking section 21 does not cause any obstruction to the locking portion 4 when the locking portion 4 is rotated in the second direction D2.

Further, after the fixing nut 3 stops rotating in the second direction D2, the locking section 21 and the locking portion 4 cooperate to restrict rotation of the fixing nut 3 relative to the rotor 2 in the opposite direction of the second direction D2.

In a typical application scenario, after the anode target disk 1 is mounted on the driving part 202 of the rotor 2, the fixing nut 3 and the locking part 4 may be preassembled, and an assembled body formed by assembling the two may be gradually screwed to a predetermined position in the second direction D2. During screwing, the locking portion 4 gradually approaches the locking section 21 and rotates relative to the locking section 21 in the second direction D2. Further, when the fixing nut 3 is screwed to a predetermined position, the assembled body cannot continue to achieve the movement in the first direction D1 by rotating in the second direction D2. At this time, the locking portion 4 and the locking section 21 cooperate with each other to restrict movement of the assembled body in the opposite direction to the second direction D2. The fixing nut 3 at the predetermined position is in close contact with the locking portion 4 and the anode target disk 1 in sequence, and the fixing nut 3 cannot move further in the first direction D1. Thereby, the self-locking of the fixation nut 3 is achieved by the cooperation of the locking section 21 and the locking portion 4.

In another typical application scenario, the locking portion 4 may also be sleeved in advance on the locking section 21, and the fixing nut 3 gradually moves along the second direction D2 and approaches the locking portion 4 until the assembly with the locking portion 4 is completed.

Further, referring to fig. 2 to 4, the rotor 2 further includes a stopper section 23, on the first plane, a cross-sectional area of the stopper section 23 is larger than that of the first through hole 11, the locking section 21 is located between the fitting section 22 and the stopper section 23 in the first direction D1, and the anode target disk 1 fixed to the fitting section 22 is clamped between the fixing nut 3 and the stopper section 23. Thus, the arrangement of the stop section 23 enables the anode target disk 1 to be clamped between the fixing nut 3 and the stop section 23, and the fixing effect of the anode target disk 1 is enhanced. The stop section 23 has a larger cross-sectional area than the first through hole 11, ensuring that the stop section 23 is effective in preventing axial movement of the anode target disk 1 relative to the rotor 2.

Specifically, the stop segment 23 may be, for example, an annular boss 32 structure formed to protrude outward from the driving portion 202. Further, on the first plane, the cross-sectional area of the stopper section 23 is larger than the cross-section of the first through hole 11. Thus, the annular boss 32 may serve to limit the length of the drive section extending into the first through bore 11.

In some embodiments, the stop segment 23 and the anode target disk 1 may be welded by brazing.

Further, on the first plane, the cross-sectional area of the fixing nut 3 is also larger than the cross-sectional area of the first through hole 11. Thereby, the anode target disk 1 can be stably clamped between the fixing nut 3 and the stopper section 23 in the first direction D1.

More specifically, the outer edge of the cross section of the locking portion 4 also encloses an area larger than the cross section of the first through hole 11. Accordingly, in the first direction D1, the fixing nut 3, the locking portion 4, the anode target disk 1, and the stopper section 23 are sequentially abutted. Further, the outer circumferential surface of the section of the driving part 202 of the rotor 2 accommodated in the first through hole 11 can be tightly attached to the inner wall of the first through hole 11, so as to increase friction, and ensure that the rotor 2 can drive the anode target disk 1 to rotate.

In some embodiments, the driving part 202 is also connected between the outer circumferential surface of the section accommodated in the first through hole 11 and the inner wall of the first through hole 11 by means of gluing, brazing, etc. to enhance the connection stability between the rotor 2 and the anode target disk 1.

Further, referring to fig. 5 to 9, the locking portion 4 includes a body 41 and at least one spring piece 42, the body 41 is provided with a second through hole 411 extending in the first direction D1, the outer circumferential surface of the locking section 21 is provided with a plurality of tooth structures 211, and each spring piece 42 protrudes from the body 41 toward the second through hole 411 and abuts against the tooth structure 211 of the locking section 21 protruding into the second through hole 411. Thus, the spring piece 42 abuts against the tooth structure 211, thereby realizing the locking effect on the fixing nut 3. In addition, the matching structure of the body 41 and the spring piece 42 is simple and practical, and is convenient to produce and assemble.

In some embodiments, the number of tooth structures 211 is greater than the number of spring plates 42. Thus, the contact point between the tooth structure 211 and the spring piece 42 can be increased, the retreating distance can be effectively shortened, and the stability and reliability of locking can be improved. The retraction distance refers to, in some application scenarios, when the fixing nut 3 is screwed to a predetermined position, if the end of the spring piece 42 near the locking section 21 contacts the tip of the previous tooth structure 211 and does not firmly abut against the adjacent tooth structure 211, the locking portion 4 may still move from the tip of the tooth structure 211 to a small distance in the opposite direction of the second direction D2 so as to abut against the adjacent tooth structure 211. This small displacement can be considered as the allowable back-off distance that occurs during self-locking, and this tolerable back-off displacement does not affect the bond integrity of the anode target disk and rotor. This can be effectively improved by increasing the number of tooth structures 211, making the fit between the locking segment 21 and the locking portion 4 more stable.

Further, referring to fig. 9 and 10, the tooth structure 211 includes a first surface 2111 and a second surface 2112 opposite to each other, and when the locking section 21 rotates along the second direction D2 with the fixing nut 3, the at least one spring piece 42 sequentially passes through the plurality of first surfaces 2111, and after the fixing nut 3 stops rotating, the at least one spring piece 42 extends between adjacent tooth structures 211. Fig. 10 is a schematic view showing the engagement of the spring piece 42 and the adjacent two tooth structures 211 when the fixing nut 3 stops rotating.

Further, the inclination angle of the first face 2111 with respect to the radial direction of the locking section 21 is larger than the inclination angle of the second face 2112 with respect to the radial direction of the locking section 21. The radial direction may be, for example, the direction through the center of a circle in any cross section of the locking segment 21.

In the scenario shown in fig. 10, adjacent tooth structures 211 may be, for example, first teeth 21101 and second teeth 21102. In some embodiments, the direction of extension of the spring plate 42 may be parallel to the first face 2111. In this scenario, when the locking portion 4 rotates in the second direction D2 (it can be considered that the locking segment 21 rotates in the opposite direction to the second direction D2 relative to the locking portion 4 in this process), the spring piece 42 may fall onto the first face 2111 of the second tooth 21102 more gently past the first face 2111 of the first tooth 21101, as the dotted line position moves to the solid line position in fig. 10. After the fixing nut 3 stops rotating, one end of the spring piece 42 near the tooth structure 211 may abut against the second face 2112 of the first tooth 21101, and the supporting force provided by the first tooth 21101 to the spring piece 42 eventually becomes a resistance that limits the rotation of the locking portion 4 and the fixing nut 3 in the opposite direction of the second direction D2.

Further, during the movement of the spring piece 42 with the fixing nut 3 in the second direction D2 relative to the first surface 2111, an end of the spring piece 42 near the first surface 2111 is bent in a direction away from the locking section 21 by the first surface 2111. That is, as the locking portion 4 rotates relative to the locking segment 21 in the second direction D2, the spring piece 42 sequentially passes through the plurality of tooth structures 211 and is continuously stirred by the tooth structures 211, and does not abut against the tooth structures 211 to prevent the fixing nut 3 from rotating relative to the mating segment 22 in the second direction D2.

With continued reference to fig. 5 to 9, the at least one spring piece 42 is arranged around the second through hole 411, and the extending direction of the at least one spring piece 42 coincides with the opposite direction of the second direction D2.

In some embodiments, the plurality of spring plates 42 may be arranged in a spiral. In other words, the intersection points of the extension lines of the pairs of adjacent two spring pieces 42 are in a common circle, and the extending direction of each spring piece 42 is tangential to the common circle.

Thus, the spiral arrangement of the spring pieces 42 enables the plurality of spring pieces 42 to be compactly arranged on the body 41, saving space. The spiral direction of the spiral arrangement is consistent with the opposite direction of the second direction D2, so that the spring piece 42 can more smoothly pass through the plurality of tooth structures 211 when the fixing nut 3 is screwed; the helically arranged spring strips 42 also provide a stable resistance against the tooth structure 211 when the fixation nut 3 has a tendency to move in the opposite direction to the second direction D2.

Further, at least one mounting groove 412 is formed in the inner wall of the second through hole 411, the at least one mounting groove 412 corresponds to the at least one spring piece 42 one by one, and at least a portion of the spring piece 42 is inserted into the corresponding mounting groove 412. The mounting groove 412 has an opening toward the locking section 21 for mounting the corresponding spring piece 42.

Further, the inner wall of the mounting groove 412 is closely fitted to the spring piece 42. Thus, the installation groove 412 increases the connection area between the spring piece 42 and the main body, so that the spring piece 42 can be firmly installed on the main body 41, and the spring piece is not easy to fall off or shift, and is not easy to break.

In some embodiments, the spring piece 42 and the corresponding mounting groove 412 may be fixedly connected by gluing or welding, so as to increase the stability of the connection between the spring piece 42 and the mounting groove 412, and avoid unexpected situations such as falling of the spring piece 42.

In some embodiments, referring to fig. 5 and 6, the thickness of the spring plate 42 is uniform for each of the spring plates 42 of the at least one spring plate 42. Therefore, the design of uniform thickness of the spring piece 42 enables the spring piece 42 to deform uniformly when being stressed, and the service life of the spring piece is prolonged. In addition, the spring piece 42 with uniform thickness can simplify the production and processing flow and reduce the production cost.

In some embodiments, referring to fig. 7 and 9, the spring plate 42 is received in the mounting slot 412 to a greater thickness on a side thereof than on a side thereof adjacent to the locking segment 21. In other words, the spring plate 42 may be, for example, a wedge-shaped structure. Accordingly, the shape of the mounting slot 412 may be adapted to the wedge-shaped structure. The area of the bottom wall 4121 of the mounting groove 412 may be larger than the area of the opening of the mounting groove 412. Thus, the spring piece 42 is more stable in the mounting groove 412 and is less prone to rattle. In addition, when the spring piece 42 abuts against the tooth structure 211, the contact area between the spring piece 42 and the bottom wall 4121 of the mounting groove 412 increases, which helps to disperse stress and prevent the bottom wall 4121 from being damaged.

It should be noted that in the drawings of the embodiments of the present application, the shape of the spring plate 42 is shown by way of example only and not by way of limitation, and thus the shapes in the respective drawings are not uniform. It should be understood that for each of the figures of the embodiments of the present application, either a uniform thickness spring plate 42 or a wedge-shaped spring plate 42 may be used in the illustrated embodiments.

Further, referring to fig. 6 to 9, the fixing nut 3 is provided with at least one protrusion 31 protruding toward the locking portion 4, the locking portion 4 is provided with at least one receiving portion 43, the at least one receiving portion 43 and the at least one protrusion 31 are in one-to-one correspondence, and the protrusion 31 can be inserted into the corresponding receiving portion 43 to synchronize the movement of the fixing nut 3 and the locking portion 4. Thus, the provision of the protruding portion 31 and the receiving portion 43 can ensure that the movement between the fixing nut 3 and the locking portion 4 can be synchronized, enhancing the overall stability of the die assembly 100.

Specifically, the at least one protruding portion 31 may be, for example, three cylindrical structures provided around the outer edge of the fixing nut 3, the three cylindrical structures being provided at intervals on the face of the fixing nut 3 facing the locking portion 4.

Further, three corresponding through hole structures may be formed at corresponding positions of the locking portion 4 to form the at least one receiving portion 43.

Further, the outer circumferential surface of the protruding portion 31 and the inner wall of the receiving portion 43 may be closely fitted to reduce the fitting clearance, ensuring the same movement state or movement tendency between the fixing nut 3 and the locking portion 4.

In some embodiments, the through-hole structure may have an opening towards the outside of the locking portion 4.

Further, an annular boss 32 is disposed on a surface of the fixing nut 3 facing the locking portion 4, an annular groove 44 for receiving the annular boss 32 is disposed on the locking portion 4, and a shape of the annular groove 44 is adapted to a shape of the annular boss 32. Thus, the engagement of the annular boss 32 and the annular groove 44 makes the connection between the fixing nut 3 and the locking portion 4 more stable and less prone to loosening. The shape of the annular boss 32 and the annular recess 44 are adapted to ensure a tight fit therebetween.

Further, the fixing nut 3 and the anode target plate 1 respectively close two ends of the second through hole 411 along the first direction D1 and the opposite direction thereof, so that chips generated by friction or impact between the locking section 21 and the plurality of spring pieces 42 accommodated in the second through hole 411 are not scattered into other spaces (for example, the vacuum accommodating cavity of the glass bulb) of the X-ray tube, and accidents such as ignition and the like caused in the high-voltage discharge environment can be avoided.

Further, referring to fig. 2 and 4, the anode target disk 1 includes a recess 12, and the recess 12 is recessed from the anode target disk 1 toward the fixing nut 3 facing away from the fixing nut 3 and communicates with the first through hole 11.

In some embodiments, the locking portion 4 is received in the recess 12.

In some embodiments, at least a portion of the fixing nut 3 is received in the recess 12.

Thereby, the length of the die assembly 100 in the first direction D1 is advantageously reduced, and the external dimensions of the X-ray tube are further reduced.

Further, the die assembly 100 may further comprise a graphite ring structure 13 disposed on a side of the anode target disk 1 facing away from the fixture nut 3. The graphite ring structure 13 is used for absorbing heat of the anode target disk 1, so as to avoid breakdown of the anode target disk 1 and damage to the die assembly 100 caused by overhigh temperature of the anode target disk 1.

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

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

the anode target plate is provided with a first through hole at the center, and the first through hole extends along a first direction;

a rotor for driving the anode target disk to rotate, at least a part of the rotor protruding from the anode target disk through the first through hole, and along the first direction, the part of the rotor protruding from the anode target disk comprises a locking section and a matching section, and the locking section is closer to the anode target disk than the matching section;

a retaining nut rotatable in a second direction in a first plane to be screwed to the mating segment, the first plane being perpendicular to the first direction;

The locking part is sleeved on the locking section, can rotate unidirectionally relative to the locking section along with the fixing nut along the second direction, and limits the rotation of the fixing nut relative to the rotor along the opposite direction of the second direction after the fixing nut stops rotating along the second direction;

The locking part comprises a body and at least one spring piece, wherein a second through hole extending along the first direction is formed in the body, a plurality of tooth structures are arranged on the outer peripheral surface of the locking section, and each spring piece extends out of the body towards the second through hole and is abutted to the tooth structure of the locking section extending into the second through hole.

2. The die assembly of claim 1, wherein the rotor further comprises a stop section having a cross-sectional area greater than a cross-sectional area of the first through bore in the first plane, the lock section being located between the mating section and the stop section in the first direction, the anode target disk secured to the mating section being clamped between the retaining nut and the stop section.

3. The die assembly of claim 1, wherein the number of tooth structures is greater than the number of spring tabs.

4. The die assembly of claim 1, wherein the tooth structure includes opposite first and second faces, the at least one spring tab passing sequentially over the plurality of first faces as the locking segment rotates with the retaining nut in the second direction, the at least one spring tab extending between adjacent tooth structures after the retaining nut stops rotating.

5. The die assembly of claim 4, wherein an inclination of the first face with respect to a radial direction of the locking segment is greater than an inclination of the second face with respect to a radial direction of the locking segment.

6. The die assembly of claim 4, wherein an end of the spring plate proximate the first face is bent under the action of the first face in a direction away from the locking segment during movement of the spring plate with the retaining nut in the second direction relative to the first face.

7. The die assembly of claim 1, wherein the at least one spring tab is arranged around the second through hole with an extension of at least one spring tab being coincident with a direction opposite the second direction.

8. The die assembly of claim 1, wherein at least one mounting groove is formed in an inner wall of the second through hole, the at least one mounting groove corresponds to the at least one spring piece one-to-one, and at least a portion of the spring piece is inserted into the corresponding mounting groove.

9. The die assembly of claim 8, wherein a thickness of the spring plate is uniform for each of the at least one spring plate; and/or the thickness of one side of the spring piece accommodated in the mounting groove is larger than that of one side close to the locking section.

10. The die assembly of claim 1, wherein the fixing nut is provided with at least one protrusion protruding toward the locking portion, the locking portion is provided with at least one receiving portion, the at least one receiving portion and the at least one protrusion are in one-to-one correspondence, and the protrusion can be inserted into the corresponding receiving portion to synchronize movement of the fixing nut and the locking portion.

11. The die assembly of claim 1, wherein an annular boss is provided on a face of the fixing nut facing the locking portion, and an annular groove for receiving the annular boss is provided on the locking portion, and a shape of the annular groove is adapted to a shape of the annular boss.

12. The die assembly of claim 1, wherein the anode target disk includes a recess recessed from a face of the anode target disk facing the retaining nut in a direction away from the retaining nut and communicating with the first through hole, at least a portion of the locking portion and/or the retaining nut being received in the recess.

13. The die assembly of claim 1, further comprising a graphite ring structure disposed on a side of the anode target disk facing away from the retaining nut.

14. An X-ray tube comprising a die assembly according to any of claims 1 to 13 for an X-ray tube.