X-ray tube using a rotating anode

Abstract

An X-ray tube using a rotating anode comprises: a housing having a first side and a second side opposite to each other in a first direction, the first direction being the same as a direction in which the first side points to the second side; the anode target can rotate in a plane perpendicular to the first direction; the driving part is directly or indirectly connected with the anode target so as to drive the anode target to rotate, the driving part comprises a connecting plate, and a conical assembly hole is formed in the connecting plate; the rotating shaft part comprises a first section and a second section, at least one part of the first section is inserted into the assembly hole and fixedly connected with the driving part, the second section is movably connected with the second side of the shell, the rotating shaft part further comprises a limiting section, the limiting section is located between the first section and the second section, and the limiting section is used for limiting the maximum length of the first section inserted into the assembly hole; and the sleeve part is arranged on the first section in a sleeving mode and is directly or indirectly fixedly connected with the first section, and the peripheral face of the sleeve part is conical and attached to the inner wall of the assembly hole. Therefore, the structural stability of the X-ray tube can be enhanced.

Description

Technical Field

[0001] The present invention relates to the technical field of X-ray tubes, and in particular to an X-ray tube using a rotating anode. Background Art

[0002] X-ray tubes occupy a pivotal position in modern medical imaging technology and are the core components to ensure the accuracy of medical diagnosis and patient safety. Among them, CT tubes, with their unique working mechanism, play a vital role in the CT scanning process. This type of X-ray tube needs to withstand a start-stop frequency of thousands of revolutions per minute in the working cycle, and the resulting periodic thermomechanical fatigue effect will significantly affect the connection stability of the shaft system. In practice, it is specifically manifested as follows: 1) The riveted interface between the rotor and the anode target 2 is prone to micro-wear, resulting in the attenuation of the preload force; 2) The difference in expansion coefficients of dissimilar metals caused by the gradient temperature field will aggravate stress concentration; 3) The creep characteristics of metals in a vacuum environment accelerate the relaxation of the connection structure, etc. The synergistic effect of these factors may cause the axial displacement of the anode target 2 to exceed the standard, and in severe cases, it may cause the target surface to fall off, resulting in X-ray output dose fluctuations and image artifacts, which directly affect the accuracy of lesion identification. Such failures will not only shorten the service life of the high-voltage generator components worth hundreds of thousands of yuan, but may also delay the golden treatment time window for critically ill patients due to sudden equipment downtime. Summary of the invention

[0003] The technical problem solved by the invention is how to improve the structural stability of the X-ray tube.

[0004] To solve the above technical problems, an embodiment of the present invention provides an X-ray tube using a rotating anode, comprising: a shell having a housing cavity, the shell having a first side and a second side opposite to each other along a first direction, the first direction being the same as the direction in which the first side points to the second side; an anode target being accommodated in the housing cavity and capable of rotating in a plane perpendicular to the first direction; a driving part being directly or indirectly connected to the anode target to drive the anode target to rotate, the driving part comprising a connecting plate, the connecting plate being provided with a tapered assembly hole; a rotating shaft part extending along the first direction and comprising a first section and a second section, wherein at least a portion of the first section is inserted into the assembly hole and fixedly connected to the driving part, the second section is movably connected to the second side of the shell, the rotating shaft part further comprising a limiting section located between the first section and the second section, the limiting section being used to limit the maximum length of the first section inserted into the assembly hole; a sleeve part being sleeved on the first section and directly or indirectly fixedly connected to the first section, the outer circumferential surface of the sleeve part being tapered and fitting against the inner wall of the assembly hole.

[0005] Optionally, there is an interaction force between the outer circumferential surface of the sleeve portion and the inner wall of the assembly hole.

[0006] Optionally, at least one of the central axis of the sleeve portion, the central axis of the assembly hole, and the central axis of the rotating shaft portion coincides with the rotation axis of the anode target.

[0007] Optionally, the angle between the inclination direction of the outer peripheral surface of the sleeve portion and the first direction is [50°, 60°].

[0008] Optionally, the diameter of the assembly hole on the side facing the first direction is smaller than the diameter of the assembly hole on the side away from the first direction.

[0009] Optionally, along the first direction, the sleeve portion has a first end and a second end relative to each other, wherein a cross-sectional area of ​​the first end is greater than a cross-sectional area of ​​the second end, and at least a portion of the connecting plate is clamped between the first end and the limiting section.

[0010] Optionally, along the first direction, there is a non-zero gap between the second end and the limiting segment.

[0011] Optionally, the sleeve portion and the first section are threadedly connected.

[0012] Optionally, the X-ray tube further comprises: a fastener, which is sleeved on the first section and located on a side of the sleeve portion away from the first direction, the fastener is threadedly connected to the first section, and the fastener abuts against an end of the sleeve portion away from the first direction.

[0013] Optionally, the driving part includes: a rotor, used to drive the anode target to rotate; a connecting tube, extending along the first direction, the connecting tube is used to connect the rotor and the anode target, the connecting tube has a hollow part, and at least a part of the rotating shaft part is accommodated in the hollow part.

[0014] Optionally, the connecting cylinder includes: a cylinder portion; and a bottom plate connected to a side of the cylinder portion facing the rotor, wherein the bottom plate is suitable for forming the connecting plate.

[0015] Optionally, the rotor is connected to a side of the base plate away from the first direction, the rotor and the base plate are connected by a fixing member, the fixing member passes through the rotor and the base plate and extends out of the base plate in the first direction, and the limiting section has an avoidance portion for avoiding the portion of the fixing member extending out of the base plate.

[0016] Optionally, there are multiple fixing members, and the multiple fixing members are arranged at intervals around the assembly hole.

[0017] Optionally, a receiving hole is provided on the rotor, the diameter of the receiving hole is larger than the maximum diameter of the assembly hole, and at least a portion of the sleeve portion is received in the receiving hole.

[0018] Optionally, the X-ray tube further comprises: a sleeve portion extending along the first direction, the sleeve portion having a third end and a fourth end opposite to each other along the extending direction, wherein the third end is movably connected to the second section, and the fourth end is fixedly connected to the second side of the shell.

[0019] Optionally, the sleeve portion has a receiving blind hole extending along the first direction, the opening of the receiving blind hole is opened at the third end, at least a portion of the second section is inserted into the receiving blind hole, and the second section can rotate in the receiving blind hole.

[0020] Optionally, along the first direction, the shaft portion is supported on the sleeve portion to form an inner wall of the receiving blind hole.

[0021] Optionally, the X-ray tube further comprises: a bearing assembly, which is disposed between the first section and an inner wall of the shaft sleeve portion forming the receiving blind hole, and the rotating shaft portion is rotatably connected to the shaft sleeve portion through the bearing assembly.

[0022] Optionally, the bearing assembly includes a bearing outer ring, which is sleeved in the first section, and the outer wall of the bearing outer ring and the shaft sleeve portion are fixedly connected to the inner wall of the receiving blind hole, and a plurality of balls are arranged between the rotating shaft portion and the bearing outer ring, and the rotating shaft portion is rotatably connected to the shaft sleeve portion through the plurality of balls.

[0023] Optionally, a plurality of first grooves are formed on the outer circumferential surface of the rotating shaft portion, and a second groove corresponding to the plurality of first grooves is formed on the inner wall of the outer ring of the bearing, and each of the plurality of balls is simultaneously accommodated in the corresponding first groove and the second groove.

[0024] Optionally, a mounting hole is formed on the second side of the shell, and at least a portion of the sleeve portion extends into the mounting hole and is fixedly connected to a wall of the shell that forms the mounting hole.

[0025] Compared with the prior art, the technical solution of the embodiment of the present invention has the following beneficial effects:

[0026] By adopting the technical solution of the present application, a tapered assembly hole is provided on the connecting plate in the driving part to cooperate with the sleeve part, thereby realizing a stable connection between the driving part and the anode target. The outer peripheral surface of the sleeve part and the inner wall of the tapered assembly hole are tightly fitted and squeezed against each other. This tapered surface-to-surface contact design ensures that the sleeve part, the anode target and the driving part maintain a high degree of concentricity due to the presence of the tapered surface during the assembly process, thereby effectively improving the stability and accuracy of the structure. Furthermore, the tapered surface will significantly increase the friction between the two contact surfaces after being compressed. This feature greatly enhances the firmness of the connection between the sleeve part and the connecting plate, effectively avoiding the loosening phenomenon that may occur during use, thereby significantly improving the operating stability and safety of the X-ray tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a schematic diagram of an X-ray tube according to an embodiment of the present invention;

[0028] Figure 2 yes Figure 1 A partial enlarged view of the middle area A;

[0029] Figure 3 yes Figure 2 A partial enlarged view of the middle area B;

[0030] Figure 4 yes Figure 1 Schematic diagram of the connecting tube;

[0031] Figure 5 yes Figure 1 Schematic diagram of the transfer shaft;

[0032] Figure 6 yes Figure 5 A schematic diagram of another view of the structure shown;

[0033] Figure 7 Yes Figure 1 Schematic diagram of the force analysis between the middle sleeve part and the assembly hole;

[0034] Figure 8 yes Figure 4 A partial enlarged view of the middle area C;

[0035] Fig. 9 yes Figure 1 Schematic diagram of the change of the proportional coefficient of the contact pressure on the matching surface of the middle sleeve part and the assembly hole and the proportional coefficient of the supporting force with the inclination angle of the matching surface;

[0036] Fig.10 yes Figure 1 Schematic diagram of the bearing assembly. DETAILED DESCRIPTION

[0037] As mentioned in the background art, the existing X-ray tubes have poor structural stability and a high failure rate.

[0038] To solve the above technical problems, an embodiment of the present invention provides an X-ray tube using a rotating anode, comprising: a shell having a housing cavity, the shell having a first side and a second side opposite to each other along a first direction, the first direction being the same as the direction in which the first side points to the second side; an anode target being accommodated in the housing cavity and capable of rotating in a plane perpendicular to the first direction; a driving part being directly or indirectly connected to the anode target to drive the anode target to rotate, the driving part comprising a connecting plate, the connecting plate being provided with a tapered assembly hole; a rotating shaft part extending along the first direction and comprising a first section and a second section, wherein at least a portion of the first section is inserted into the assembly hole and fixedly connected to the driving part, the second section is movably connected to the second side of the shell, the rotating shaft part further comprising a limiting section located between the first section and the second section, the limiting section being used to limit the maximum length of the first section inserted into the assembly hole; a sleeve part being sleeved on the first section and directly or indirectly fixedly connected to the first section, the outer circumferential surface of the sleeve part being tapered and fitting against the inner wall of the assembly hole.

[0039] By adopting the technical solution of the present application, a stable connection between the drive unit and the anode target is achieved by opening a conical assembly hole on the connecting plate in the drive unit and cooperating with the sleeve unit. The outer peripheral surface of the sleeve unit and the inner wall of the conical assembly hole are tightly fitted and squeezed against each other. This conical surface-to-surface contact design ensures that the sleeve and the target disc rotor assembly maintain a high degree of concentricity due to the presence of the conical surface during the assembly process, effectively improving the stability and accuracy of the structure. At the same time, the conical surface will significantly increase the friction between the two contact surfaces after being compressed. This feature greatly enhances the firmness of the connection and effectively avoids the loosening phenomenon that may occur during use, thereby significantly improving the operating stability and safety of the X-ray tube.

[0040] In order to make the above-mentioned objects, features and beneficial effects of the present invention more obvious and easy to understand, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0041] Figure 1 is a schematic diagram of an X-ray tube 100 according to an embodiment of the present invention. Figure 2 yes Figure 1 A partial enlarged view of area A in the middle. Figure 3 yes Figure 2 A partial enlarged view of area B in the middle.

[0042] Combination Figures 1 to 3The X-ray tube 100 may include: a housing 1 having a housing cavity 101, wherein the housing 1 has a first side 11 and a second side 12 opposite to each other along a first direction D1, wherein the first direction D1 is in the same direction as the direction in which the first side 11 points to the second side 12; an anode target 2 accommodated in the housing cavity 101 and capable of rotating in a plane perpendicular to the first direction D1; a driving unit 3 directly or indirectly connected to the anode target 2 to drive the anode target 2 to rotate, wherein the driving unit 3 includes a connecting plate 31, wherein the connecting plate 31 is provided with a conical assembly hole 311; a rotating shaft 4 extending along the first direction D1 and including a first section 41 and a second section 42, wherein at least a portion of the first section 41 is inserted into the assembly hole 311 and fixedly connected to the driving portion 3, the second section 42 is movably connected to the second side 12 of the shell 1, the shaft portion 4 also includes a limiting section 43, which is located between the first section 41 and the second section 42, and the limiting section 43 is used to limit the maximum length of the first section 41 inserted into the assembly hole 311; a sleeve portion 5, which is sleeved on the first section 41 and directly or indirectly fixedly connected to the first section 41, and the outer peripheral surface of the sleeve portion 5 is conical and fits with the inner wall of the assembly hole 311.

[0043] Specifically, the X-ray tube 100 (also referred to as an X-ray tube, a CT tube) can be used in X-ray machines in the medical field, such as disease detection instruments such as CT machines. With the development of technology, CT machines have been popularized with high resolution and intuitive and accurate diagnostic effects, and have been widely used in the medical field. The X-ray tube 100 can be used as a core component in a CT machine, and is widely used in practice to generate X-rays. Therefore, whether the technology of the X-ray tube 100 is perfect directly affects the working effect of the CT machine.

[0044] Furthermore, the housing 1 may be a sealed structure and have a vacuum containing cavity 101. Furthermore, along the first direction D1, the housing 1 has a first side 11 and a second side 12 opposite to each other. It should be understood that the first side 11 and the second side 12 here refer to Figure 1 The left and right sides under the viewing angle, rather than the inside and outside of the accommodating cavity 101.

[0045] Furthermore, in the X-ray tube 100, the principle of generating X-rays is that the filament in the cathode assembly 10 generates heat to generate electrons, and a large number of electrons are accelerated by the high-voltage electric field between the cathode assembly 10 and the anode target 2 to bombard the anode target 2 to generate X-rays. The X-rays are reflected by the target surface and emitted from the electron emission window 2022, and are received by the CT detector for imaging after passing through the patient. The process of electron bombardment of the anode target 2 will generate a large amount of heat. If the bombardment position remains unchanged, the bombarded area of ​​the anode target 2 will generate a large amount of heat, and the heat generation rate is much greater than its heat dissipation rate. When the heat accumulates to a critical value, the bombarded area of ​​the target surface melts, causing the anode to fail. Therefore, in the prior art, the X-ray tube 100 generally adopts a rotating anode, that is, the anode target 2 is in a rotating state during operation, so that the position of the electron bombardment on the anode target 2 changes continuously, avoiding the phenomenon of local temperature increase and damage to the anode target 2.

[0046] Furthermore, the anode target 2 is accommodated in the accommodating cavity 101 of the housing 1. The anode target 2 can rotate at a high speed in a plane perpendicular to the first direction D1.

[0047] Furthermore, the driving part 3 may include a connecting plate 31. The connecting plate 31 may serve as a connecting interface between the driving part 3 and the rotating shaft part 4. The connecting plate 31 is provided with a conical assembly hole 311. Figure 8 shown.

[0048] Furthermore, along the first direction D1, the first section 41 of the shaft portion 4 can be inserted into the tapered assembly hole 311 of the driving portion 3, and the first section 41 and the driving portion 3 are fixedly connected. Thus, the shaft portion 4 can rotate synchronously with the driving portion 3.

[0049] Furthermore, the second section 42 of the rotating shaft portion 4 is movably connected to the second side of the housing 1 to enable the rotating shaft portion 4 to rotate in the accommodating cavity 101 .

[0050] In some embodiments, the anode target 2, the driving part 3 and the rotating shaft part 4 move synchronously. Furthermore, through the movable connection between the second section 42 of the rotating shaft part 4 and the housing 1, the anode target 2 and the driving part 3 can be suspended in the accommodating cavity 101, thereby reducing the wear between the components and extending the service life of the X-ray tube.

[0051] Further, combined with Figure 1 , Figure 2 and Figure 5 The shaft portion 4 further includes a limiting section 43. Along the first direction D1, the limiting section 43 is disposed between the first section 41 and the second section 42. Further, the cross-sectional area of ​​the limiting section 43 is greater than the cross-sectional area of ​​the first section 41. When the first section 41 is inserted into the assembly hole 311, the limiting section 43 can abut against the connecting plate 31, thereby limiting the maximum length of the first section 41 inserted into the assembly hole 311.

[0052] Furthermore, the sleeve portion 5 may be sleeved on the first section 41 , and the sleeve portion 5 may be directly or indirectly fixedly connected to the first section 41 .

[0053] In some embodiments, the diameter of the assembly hole 311 on the side facing the first direction D1 is smaller than the diameter of the side away from the first direction D1. In other words, along the first direction, the diameter of the assembly hole 311 gradually decreases.

[0054] Furthermore, the outer peripheral surface of the sleeve portion 5 may be tapered.

[0055] In some embodiments, the outer peripheral surface of the sleeve portion 5 can be in contact with the inner wall of the assembly hole 311 to form a surface-to-surface contact. Therefore, on the one hand, the axial pressing force of the fastener 6 can be converted into a radial expansion force of the sleeve portion 5 on the connecting plate 31, thereby increasing the friction between the two and avoiding loosening during the start-up and shutdown of the X-ray tube 100. On the other hand, the cooperation between the conical surfaces can also provide a pre-tightening force for the connection between the sleeve portion 5 and the connecting plate 31, making the connection between the components inside the X-ray tube 100 tighter and more secure.

[0056] In some embodiments, there is an interaction force between the outer circumference of the sleeve portion 5 and the inner wall of the assembly hole 311. Both the outer circumference of the sleeve portion 5 and the assembly hole 311 are conical structures. When assembled, they are compressed axially to generate a radial component of force, so that the two contact surfaces are in a pre-tightened state of surface contact. In this way, the connection stability between the sleeve portion 5 and the connecting plate 31 can be increased, thereby ensuring a stable connection between the shaft portion 4 and the drive portion 3. Furthermore, the interaction force can also offset the periodic thermal-mechanical load. Specifically, the conical surface contact can disperse the differential expansion stress of dissimilar metals caused by the temperature gradient and reduce the connection relaxation caused by creep.

[0057] Further, along the first direction D1, the sleeve portion 5 has a first end 51 and a second end 52 opposite to each other, wherein the cross-sectional area of ​​the first end 51 is greater than the cross-sectional area of ​​the second end 52 , and at least a portion of the connecting plate 31 is clamped between the first end 51 and the limiting section 43 .

[0058] Specifically, the shape of the sleeve portion 5 is adapted to the shape of the assembly hole 311. When at least a portion of the sleeve portion 5 is inserted into the assembly hole 311 and installed in place, the second end 52 of the sleeve portion 5 is located inside the assembly hole 311, and the outer peripheral surface of the sleeve portion 5 is tightly fitted to the inner wall of the assembly hole 311.

[0059] In some embodiments, after the sleeve portion 5 is installed in place, the outer circumference of the sleeve portion 5 will be slightly deformed due to the squeezing of the inner wall of the assembly hole 311, so that the outer circumference of the sleeve portion 5 is more closely fitted to the inner wall of the assembly hole 311, and the elastic stress generated can further increase the friction between the outer circumference of the sleeve portion 5 and the inner wall of the assembly hole 311.

[0060] Furthermore, the limiting section 43 is located on the side of the connecting plate 31 facing the first direction D1. Along the first direction D1, the projections of the portion of the sleeve portion 5 close to the first end 5, the portion of the connecting plate 31 facing the first direction D1, and the limiting section 43 overlap. At this time, it can be roughly regarded that the portion of the connecting plate 31 facing the first direction D1 is clamped by the portion of the sleeve portion 5 close to the first end 5 and the limiting section 43. In this way, the connection between the driving portion 3, the anode target 2, and the rotating shaft portion 4 can be made more firm and stable.

[0061] In some embodiments, a threaded structure may be provided on the outer circumferential surface of the first section 41 and the inner wall of the sleeve portion 5 facing the first section 41 , and the first section 41 and the sleeve portion 5 may be fixedly connected by threaded fitting.

[0062] In some embodiments, the X-ray tube may further include a fastener 6, which is sleeved on the first section 41 and located on the side of the sleeve portion 5 away from the first direction D1, the fastener 6 is threadedly connected to the first section 41, and the fastener 6 abuts against the end of the sleeve portion 5 away from the first direction D1. Thus, the fastener 6 can apply torque, and the torque is converted into an axial preload through the conical surface fit between the sleeve portion 5 and the connecting plate 31 and acts on the contact surface of the sleeve portion 5 and the connecting plate 31, thereby increasing the friction force on the contact surface and ensuring the stability of the connection between the sleeve portion 5 and the connecting plate 31.

[0063] In some embodiments, in combination Figures 1 to 3 , along the first direction D1, there is a non-zero gap between the second end 52 and the limiting section 43. Thus, it is possible to avoid direct contact between the sleeve portion 5 and the limiting section 43 or even generate an interaction force, resulting in the pre-tightening force between the sleeve portion 5 and the inner wall of the assembly hole 311 along the first direction D1 being offset, thereby reducing the friction between the outer circumference of the sleeve portion 5 and the inner wall of the assembly hole 311, affecting the stability of the connection between the driving portion 3 and the rotating shaft portion 4.

[0064] In some embodiments, at least one of the central axis of the sleeve portion 5 , the central axis of the assembly hole 311 , and the central axis of the shaft portion 4 coincides with the rotation axis of the anode target 2 .

[0065] In a preferred embodiment, the central axis of the sleeve portion 5, the central axis of the assembly hole 311, the central axis of the shaft portion 4 and the rotation axis of the anode target 2 coincide with each other. As a result, the sleeve portion 5, the connecting plate 31 (i.e., the drive portion 3) and the shaft portion 4 can rotate coaxially, avoiding the introduction of a new transmission structure in the X-ray tube, which results in a complex structure and increased instability. Furthermore, the coincidence of the central axis of the sleeve portion 5, the central axis of the assembly hole 311, the central axis of the shaft portion 4 and the rotation axis of the anode target 2 can make the rotation of the rotating parts (such as the anode target 2, the drive portion 3 and the shaft portion 4) in the X-ray tube 100 more stable, avoiding collision and damage caused by deflection between structures.

[0066] In some embodiments, the angle between the inclined direction of the outer circumferential surface of the sleeve portion 5 and the first direction D1 is in the range of [50°, 60°].

[0067] Figure 7 Yes Figure 1 Schematic diagram of the force analysis between the middle sleeve portion 5 and the assembly hole 311.

[0068] Combination Figures 7 to 9 When the drive part 3 and the shaft part 4 are assembled, the thrust force applied by the fastener 6 to the sleeve part 5 becomes a preload force in the axial direction (corresponding to F in the figure). 预紧力 ), and indirectly acts on the conical contact surface between the sleeve portion 5 and the assembly hole 311. Further, a balanced force system is formed between the preload force, the friction force along the contact surface on which the sleeve portion 5 is subjected, and the support force provided by the inner wall of the assembly hole 311 perpendicular to the outer peripheral surface of the sleeve portion 5. Among them, the magnitude of the support force determines the stability of the connection between the sleeve portion 5 and the connecting plate 31, but due to the limitation of the design space, the greater the support force, the greater the pressure on the contact surface, the easier it is for the material to be crushed, and it is not easy to disassemble and reuse. To this end, the inventors of the present application derived the following formula to determine the preferred range of the inclination angle of the conical outer peripheral surface of the sleeve portion 5 (that is, the angle between the inclination direction of the outer peripheral surface of the sleeve portion 5 and the plane perpendicular to the first direction D1).

[0069] refer to Figure 7 , the force analysis of the outer peripheral surface of the sleeve portion 5 is performed, and the following formula is obtained:

[0070]

[0071]

[0072] Among them, Recorded as the proportionality coefficient of the support force; is the inclination angle of the tapered outer peripheral surface of the sleeve portion 5; is the friction coefficient between the outer peripheral surface of the sleeve portion 5 and the inner wall of the fitting hole 311 .

[0073] Furthermore, the proportionality coefficient of the above supporting force varies with the inclination angle of the tapered outer peripheral surface of the sleeve portion 5. The changing curve is as follows Fig. 9 Shown as the black curve in the middle.

[0074] refer to Figure 8 , the pressure on the contact surface between the sleeve portion 5 and the connecting plate 31 can be calculated by the following formula:

[0075]

[0076]

[0077]

[0078] Among them, ( ) is recorded as the surface contact pressure proportionality coefficient; r is the cross-sectional radius at the smallest inner diameter of the assembly hole 311; h is the length of the assembly hole 311 along the first direction D1; S is the surface area of ​​the inner wall of the assembly hole 311.

[0079] Furthermore, the surface contact pressure proportionality coefficient changes with the inclination angle of the tapered outer peripheral surface of the sleeve portion 55. The changing curve is as follows Fig. 9 Shown as the yellow curve in the middle.

[0080] In the above formula, h / r / It is a design value and is determined by the actual structure of the X-ray tube 100. Fig. 9 From the structural trend, the angle α increases and the two proportional coefficients increase at the same time, but the pressure proportional coefficient increases faster, which also means that the greater the pressure on the contact surface, the greater the risk of material crushing. In addition, the larger the angle, the thinner the sleeve wall thickness and the worse the sleeve stability. Considering the machinability, the angle α is preferably 50°-60°. That is, the angle between the inclined direction of the outer peripheral surface of the sleeve portion 5 and the plane perpendicular to the first direction D1 is [50°, 60°]

[0081] In some embodiments, in combination Figures 1 to 4 The driving part 3 may further include: a rotor 32, used to drive the anode target 2 to rotate; a connecting tube 33, extending along the first direction D1, the connecting tube 33 is used to connect the rotor 32 and the anode target 2, the connecting tube 33 has a hollow part, and at least a part of the rotating shaft part 4 is accommodated in the hollow part. Thus, the rotor 32 is rigidly connected to the anode target 2 through the connecting tube 33 to form an integrated rotating body, ensuring that the driving torque is directly transmitted to the anode target 2, reducing the kinetic energy loss of the intermediate link of the transmission chain.

[0082] Furthermore, the connecting cylinder 33 may further include: a cylinder portion 331 ; and a bottom plate 332 connected to a side of the cylinder portion 331 facing the rotor 32 , wherein the bottom plate 332 is suitable for forming the connecting plate 31 .

[0083] In some embodiments, in combination Figure 1 , Figures 4 to 6 The rotor 32 is connected to the side of the bottom plate 332 away from the first direction D1, the rotor 32 and the bottom plate 332 are connected by a fixing member 7, the fixing member 7 penetrates the rotor 32 and the bottom plate 332 and extends out of the bottom plate 332 in the first direction D1, and the limiting section 43 has an avoidance portion 431 for avoiding the portion of the fixing member 7 extending out of the bottom plate 332.

[0084] In some embodiments, the number of the fixing members 7 is multiple, and the multiple fixing members 7 are arranged around the assembly hole 311. In this way, while increasing the stability of the connection between the rotor 32 and the connecting tube 33, the stress can also be dispersed to avoid structural damage caused by stress concentration.

[0085] In some embodiments, the rotor 32 is provided with a receiving hole 321, the diameter of the receiving hole 321 is larger than the maximum diameter of the assembly hole 311, and at least a portion of the sleeve portion 5 is received in the receiving hole 321 (for example, the first end 51 of the sleeve portion 5). Thus, the installation of the sleeve portion 5 and the fastener 6 can be facilitated.

[0086] In some embodiments, continue to refer to Figure 1 The X-ray tube 100 may further include: a sleeve portion 8 extending along the first direction D1, wherein the sleeve portion 8 has a third end 81 and a fourth end 82 opposite to each other along the extending direction, wherein the third end 81 is movably connected to the second section 42, and the fourth end 82 is fixedly connected to the second side 12 of the housing 1. Thus, the second section 42 of the rotating shaft portion 4 can be movably connected to the second side 12 of the housing 1 through the sleeve portion 8.

[0087] In some embodiments, a mounting hole 102 is formed on the second side 12 of the shell 1 , and at least a portion of the sleeve portion 8 (eg, the fourth end 82 ) extends into the mounting hole 102 and is fixedly connected to a wall of the shell 1 forming the mounting hole 102 .

[0088] Furthermore, the sleeve portion 8 has a receiving blind hole 83 extending along the first direction D1, the opening of the receiving blind hole 83 is opened at the third end 81, at least a part of the second section 42 is inserted into the receiving blind hole 83, and the second section 42 can rotate in the receiving blind hole 83.

[0089] Further, along the first direction D1, the shaft portion 4 can be supported on the inner wall of the sleeve portion 8 to form the receiving blind hole 83. Thus, through the connection between the shaft portion 4 and the sleeve portion 8, the anode target 2 and the driving portion 3 can be suspended in the accommodating cavity 101, reducing the wear between the components in the X-ray tube 100 and extending the service life of the X-ray tube 100.

[0090] In some embodiments, in combination Figure 1 and Fig.10 The X-ray tube 100 may further include: a bearing assembly 9 disposed between the first section 41 and the inner wall of the sleeve portion 8 forming the receiving blind hole 83 , and the shaft portion 4 is rotatably connected to the sleeve portion 8 through the bearing assembly 9 .

[0091] Furthermore, the bearing assembly 9 includes a bearing outer ring 91, which is sleeved in the first section 41. The outer wall of the bearing outer ring 91 and the shaft sleeve portion 8 are fixedly connected to the inner wall of the receiving blind hole 83. A plurality of balls 92 are arranged between the rotating shaft portion 4 and the bearing outer ring 91. The rotating shaft portion 4 is rotatably connected to the shaft sleeve portion 8 through the plurality of balls 92.

[0092] In a variation, the bearing assembly 9 may also use a liquid metal bearing to further reduce wear and tear and extend the service life of the X-ray tube 100 .

[0093] In some embodiments, the outer circumferential surface of the rotating shaft portion 4 is provided with a plurality of first grooves 93, the inner wall of the bearing outer ring 91 is provided with second grooves 94 corresponding to the plurality of first grooves 93, and each of the plurality of balls 92 is simultaneously accommodated in the corresponding first groove 93 and the second groove 94. Thus, the displacement of the rotating shaft portion 4 relative to the shaft sleeve portion 8 along the first direction D1 can be limited by the engagement between the balls 92 and the corresponding first grooves 93 and the second grooves 94.

[0094] From the above, the technical solution of the present application is adopted, and a stable connection between the driving part 3 and the anode target 2 is achieved by opening a conical assembly hole 311 on the connecting plate 31 in the driving part 3 and cooperating with the sleeve part 5. The outer peripheral surface of the sleeve part 5 and the inner wall of the conical assembly hole 311 are tightly fitted and squeezed against each other. This conical surface-to-surface contact design ensures that the sleeve part 5, the anode target 2 and the driving part 3 maintain a high degree of concentricity due to the presence of the conical surface during the assembly process, effectively improving the stability and accuracy of the structure. At the same time, the conical surface will significantly increase the friction between the two contact surfaces after being compressed. This feature greatly enhances the firmness of the connection between the sleeve part 5 and the connecting plate 31, effectively avoiding the loosening phenomenon that may occur during use, thereby significantly improving the operating stability and safety of the X-ray tube.

[0095] It should be understood that the term "and / or" herein is merely an association relationship describing associated objects, indicating that three relationships may exist, for example, A and / or B, which may represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " herein indicates that the associated objects before and after are in an "or" relationship. As used herein, unless otherwise expressly stated, the term "or" covers all possible combinations unless it is not feasible. For example, if a component is stated to include A or B, then unless otherwise expressly stated or not feasible, the component may include A, or B, or A and B. As a second example, if a component is stated to include A, B, or C, then unless otherwise expressly stated or not feasible, the component may include A, or B, or C, or A and B, or A and C, or B and C, or A and B and C. The "multiple" appearing in the embodiments of the present application refers to two or more.

[0096] The relational terms appearing in the embodiments of the present application, such as first, second, etc., are only used to distinguish an entity or operation from another entity or operation, and do not require or imply any actual relationship or order between these entities or operations. In addition, the words "include", "have" and "comprise" and other similar forms are intended to be equivalent in meaning, and are open-ended, and one or more items behind any of these words are not meant to be an exhaustive list of such one or more items, or mean to be limited to one or more items listed. In the accompanying drawings and the specification, exemplary embodiments have been disclosed. However, many changes and modifications can be made to these embodiments. Therefore, although specific terms have been adopted, they are only used in a general and descriptive sense, not for the purpose of limitation.

[0097] Although the present invention is disclosed as above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the scope defined by the claims.

Claims

1. An X-ray tube using a rotating anode, characterized in that: include: A housing having a receiving cavity, wherein the housing has a first side and a second side opposite to each other along a first direction, wherein the first direction is in the same direction as a direction in which the first side points to the second side; an anode target, accommodated in the accommodation cavity and capable of rotating in a plane perpendicular to the first direction; A driving part, directly or indirectly connected to the anode target to drive the anode target to rotate, the driving part comprises a connecting plate, and the connecting plate is provided with a conical assembly hole; a shaft portion extending along the first direction and comprising a first section and a second section, wherein at least a portion of the first section is inserted into the assembly hole and fixedly connected to the driving portion, and the second section is movably connected to the second side of the housing, and the shaft portion further comprises a limiting section located between the first section and the second section, and the limiting section is used to limit a maximum length of the first section inserted into the assembly hole; The sleeve portion is sleeved on the first section and is directly or indirectly fixedly connected to the first section. The outer peripheral surface of the sleeve portion is tapered and fits with the inner wall of the assembly hole.

2. The X-ray tube according to claim 1, characterized in that There is a mutual force between the outer peripheral surface of the sleeve portion and the inner wall of the fitting hole.

3. The X-ray tube according to claim 1, characterized in that At least one of the central axis of the sleeve portion, the central axis of the assembly hole, and the central axis of the rotating shaft portion coincides with the rotation axis of the anode target.

4. The X-ray tube according to claim 1, characterized in that The angle between the inclined direction of the outer peripheral surface of the sleeve portion and a plane perpendicular to the first direction is in the range of [50°, 60°].

5. The X-ray tube according to claim 1, characterized in that The diameter of the assembly hole on the side facing the first direction is smaller than the diameter of the assembly hole on the side facing away from the first direction.

6. The X-ray tube according to claim 5, characterized in that Along the first direction, the sleeve portion has a first end and a second end opposite to each other, wherein a cross-sectional area of ​​the first end is larger than a cross-sectional area of ​​the second end, and at least a portion of the connecting plate is clamped between the first end and the limiting section.

7. The X-ray tube according to claim 6, characterized in that Along the first direction, there is a non-zero gap between the second end and the limiting segment.

8. The X-ray tube according to claim 5, characterized in that The sleeve portion and the first section are threadedly connected; and / or It also includes: a fastener, which is sleeved on the first section and located on the side of the sleeve portion away from the first direction, the fastener is threadedly connected to the first section, and the fastener abuts against the end of the sleeve portion away from the first direction.

9. The X-ray tube according to claim 1, characterized in that The driving unit comprises: A rotor, used for driving the anode target to rotate; A connecting tube extends along the first direction, and is used to connect the rotor and the anode target. The connecting tube has a hollow portion, and at least a part of the rotating shaft is accommodated in the hollow portion.

10. The X-ray tube according to claim 9, characterized in that The connecting tube comprises: Cylinder; A bottom plate is connected to a side of the barrel portion facing the rotor, and the bottom plate is suitable for forming the connecting plate.

11. The X-ray tube according to claim 10, characterized in that The rotor is connected to a side of the bottom plate away from the first direction, the rotor and the bottom plate are connected by a fixing member, the fixing member penetrates the rotor and the bottom plate and extends out of the bottom plate toward the first direction, and the limiting section has an avoidance portion for avoiding the portion of the fixing member extending out of the bottom plate; and / or There are multiple fixing parts, and the multiple fixing parts are arranged at intervals around the assembly hole.

12. The X-ray tube according to claim 10, characterized in that The rotor is provided with a receiving hole, the diameter of the receiving hole is larger than the maximum diameter of the assembly hole, and at least a part of the sleeve portion is received in the receiving hole.

13. The X-ray tube according to claim 1, characterized in that Also includes: The shaft sleeve portion extends along the first direction, and along the extending direction, the shaft sleeve portion has a third end and a fourth end opposite to each other, wherein the third end is movably connected to the second section, and the fourth end is fixedly connected to the second side of the shell.

14. The X-ray tube according to claim 13, characterized in that The sleeve portion has a receiving blind hole extending along the first direction, the opening of the receiving blind hole is opened at the third end, at least a part of the second section is inserted into the receiving blind hole, and the second section can rotate in the receiving blind hole.

15. The X-ray tube according to claim 14, characterized in that Along the first direction, the rotating shaft portion is supported on the inner wall of the sleeve portion to form the receiving blind hole.

16. The X-ray tube according to claim 14, characterized in that Also includes: The bearing assembly is arranged between the first section and the inner wall of the shaft sleeve portion forming the receiving blind hole, and the rotating shaft portion is rotatably connected to the shaft sleeve portion through the bearing assembly.

17. The X-ray tube according to claim 16, characterized in that The bearing assembly includes a bearing outer ring, which is sleeved in the first section. The outer wall of the bearing outer ring and the shaft sleeve portion are fixedly connected to the inner wall of the receiving blind hole. A plurality of balls are arranged between the rotating shaft portion and the bearing outer ring. The rotating shaft portion is rotatably connected to the shaft sleeve portion through the plurality of balls.

18. The X-ray tube according to claim 17, characterized in that The outer circumferential surface of the rotating shaft portion is provided with a plurality of first grooves, the inner wall of the outer ring of the bearing is provided with second grooves corresponding to the plurality of first grooves, and each of the plurality of balls is simultaneously accommodated in the corresponding first groove and the second groove.

19. The X-ray tube according to claim 13, characterized in that A mounting hole is formed on the second side of the housing, and at least a portion of the shaft sleeve portion extends into the mounting hole and is fixedly connected to a wall of the housing that forms the mounting hole.

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