X-ray tube anode target disc fixing structure

Abstract

The utility model relates to an X-ray tube anode target disc fixing structure which comprises a rotor, and an anode target disc, a fixing nut, an anti-loose gasket and a locking cover are sequentially installed on the rotor. The locking cover tightly presses the anti-loose gasket, so that the anti-loose gasket generates elastic deformation between the fixing nut and the locking cover; the anti-loose gasket is a wave-shaped gasket; an anti-rotation structure is arranged between the rotor and the anode target disc, the anti-loose gasket is provided with 4-6 waveforms and is made of molybdenum alloy or tungsten alloy, and the rotor is in clearance fit with the anode target disc. The utility model has the advantages of high reliability, long service life and low assembly requirement, eliminates the gas retention risk of the internal closed cavity, and realizes the directional dredging of the gas by establishing a communication channel between the cavity and the external high vacuum environment.

Description

Technical Field

[0001] This utility model belongs to the field of medical imaging technology and relates to the fixing structure of X-ray tube anode target plate. Background Technology

[0002] As a core component of modern medical imaging technology, the performance and stability of X-ray tubes are crucial to the accuracy of medical diagnosis and patient safety. Among them, CT tubes, with their unique working mechanism, play an irreplaceable role in CT scans. Their high-precision focusing capability, high-efficiency conversion characteristics, precision manufacturing process, and strong environmental adaptability make CT scanning an efficient and accurate medical imaging diagnostic tool. However, CT tubes require frequent start-ups and shutdowns during operation, which can lead to relative rotation between the nut fixing the anode target disk and the rotor, and even pose a risk of detachment, seriously affecting the stability and safety of the equipment.

[0003] While traditional anode target plate fixing methods can meet basic requirements under normal conditions, their limitations become increasingly apparent under complex operating conditions such as high-speed rotation and sudden stops. After prolonged use, the fixing nuts are prone to loosening or even falling off, leading to a significant decrease or complete disappearance of the axial compressive force on the anode target plate. This problem could not only cause the anode target plate to detach from the rotor, thereby damaging the CT tube, but also potentially cause serious damage to the CT gantry. This potential safety hazard undoubtedly poses a significant threat and urgently needs to be addressed through technological improvements. Summary of the Invention

[0004] The purpose of this invention is to provide an X-ray tube anode target plate fixing structure that can solve the problem of the anode target plate falling off the rotor and prevent gas expansion during X-ray tube operation.

[0005] According to the technical solution provided by this utility model: an X-ray tube anode target disk fixing structure includes a rotor, on which an anode target disk, a fixing nut, an anti-loosening washer, and a locking cover are sequentially installed; the locking cover presses the anti-loosening washer, causing the anti-loosening washer to elastically deform between the fixing nut and the locking cover; the anti-loosening washer is a corrugated washer; an anti-rotation structure is provided between the rotor and the anode target disk.

[0006] As a further improvement of this utility model, the anti-loosening gasket has 4 to 6 waveforms.

[0007] As a further improvement of this utility model, the anti-loosening gasket is made of molybdenum alloy or tungsten alloy.

[0008] As a further improvement of this utility model, the rotor and the anode target disk are fitted with a clearance.

[0009] As a further improvement of the utility model, the upper part of the rotor is provided with a target disc positioning shaft section, and the bottom of the target disc positioning shaft section is a target disc positioning end face; an installation hole is arranged in the anode target disc, and a target disc bottom is arranged below the installation hole; the target disc positioning shaft section is located in the installation hole.

[0010] As a further improvement of the utility model, the cooperation gap between the target disc positioning shaft section and the installation hole is 0.005mm-0.008mm.

[0011] As a further improvement of the utility model, the anode target disc main body is made of graphite and molybdenum alloy (TZM), the upper surface is made of tungsten molybdenum alloy, and the cooperation part with the rotor is made of molybdenum alloy material; the rotor is made of molybdenum alloy (TZM).

[0012] As a further improvement of the utility model, the rotor and the fixing nut are in threaded cooperation; the rotor and the locking cap are in threaded cooperation.

[0013] As a further improvement of the utility model, the anti-rotation structure comprises cooperating anti-rotation pins and anti-rotation pin holes, two anti-rotation pins are symmetrically arranged on the target disc positioning end face, and the anti-rotation pin holes are located on the target disc bottom.

[0014] As a further improvement of the utility model, the bottom surface of the upper part of the locking cap is annularly and uniformly distributed with locking cap exhaust grooves, and the rotor exhaust grooves are arranged on the target disc positioning end face.

[0015] The positive progress effect of the application is that:

[0016] The utility model has the advantages of high reliability, long service life, low assembly requirement, elimination of the gas retention risk of the internal sealed cavity, realization of the directional dredging of gas by establishing the communication channel between the cavity and the external high vacuum environment. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is an explosion diagram of the utility model.

[0018] Figure 2 It is a sectional view of the utility model.

[0019] Figure 3 It is a schematic view of the rotor of the utility model.

[0020] Figure 4 It is a structural schematic view of the locking cap of the utility model.

[0021] Figure 5 It is a structural schematic view of the fixing nut of the utility model.

[0022] Figure 6 It is a structural schematic view of the lock washer of the utility model.

[0023] Figure 7It is an enlarged schematic view of the upper part of the rotor of the utility model.

[0024] Figure 8 It is a schematic view of exhaust of the utility model. DETAILED DESCRIPTION

[0025] It should be noted that the embodiments in the utility model and the features in the embodiments can be combined with each other without conflict. The utility model will be described in detail below with reference to the drawings and in combination with the embodiments.

[0026] In order to make the person skilled in the art better understand the utility model scheme, the technical scheme in the embodiments of the utility model will be described clearly and completely below in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only a part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without creative labor should belong to the protection scope of the utility model.

[0027] It should be noted that the terms "first", "second" and the like in the specification and claims of the utility model and the above drawings are used to distinguish similar objects, not necessarily to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the utility model described herein can be implemented. In addition, "including" and "having" and the like, means that in addition to those listed in "including" and "having", other unlisted contents can also be "including" and "having"; for example, a process, method, system, product or device that can contain a series of steps or units, not necessarily limited to those steps or units clearly listed, but can include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0028] Due to the angle of the drawing, some parts may not be drawn, but their positions and connection relationships can be understood according to the textual expression part.

[0029] As Figures 1-2 The utility model discloses an X-ray tube anode target disc fixing structure, including the rotor 200, the rotor 200 installs anode target disc 100, fixed nut 300, anti-loosening washer 500, locking cover 400 in proper order. The anti-rotation structure is arranged between the rotor 200 and the anode target disc 100.

[0030] The rotor 200 and the anode target disc 100 are gap fit. As Figure 7As shown, the upper part of the rotor 200 is provided with a target disc positioning shaft segment 203, and the bottom of the target disc positioning shaft segment 203 is a target disc positioning end face 204; the anode target disc 100 is provided with a mounting hole 102, and the bottom of the target disc is provided below the mounting hole 102. When the rotor 200 and the anode target disc 100 are installed, the target disc positioning shaft segment 203 is located in the mounting hole 102, and the gap between the two is 0.005mm~0.008mm; the target disc positioning end face 204 abuts against the bottom of the target disc. The anode target disc main body of the anode target disc 100 is made of graphite and molybdenum alloy (TZM), and the upper surface is tungsten molybdenum alloy, and the matching part with the rotor 200 is made of molybdenum alloy material. The rotor 200 is made of molybdenum alloy (TZM).

[0031] The rotor 200 and the fixing nut 300 are in threaded cooperation. The outer periphery of the top of the rotor 200 is provided with a rotor outer threaded shaft segment 205, and the fixing nut 300 is provided with a threaded hole matched therewith.

[0032] The fixing nut 300 abuts against the top surface of the anode target disc 100, so that the anode target disc 100 is fixed between the rotor 200 and the fixing nut 300.

[0033] The rotor 200 and the locking cap 400 are in threaded cooperation. The inner periphery of the top of the rotor 200 is provided with a rotor inner threaded hole 206, and the lower part of the locking cap 400 is a locking cap threaded shaft segment matched therewith. The locking cap 400 compresses the lock washer 500 tightly, so that the lock washer 500 is elastically deformed between the fixing nut 300 and the locking cap 400.

[0034] As shown, Figure 6 The lock washer 500 is made of molybdenum alloy or tungsten alloy, is similar to a wave washer, and has 4~6 waves. During work, the lock washer 500 is compressed by the locking cap 400, and after compression, the lock washer 500 is elastically deformed, and generates a radial pre-tightening force on the fixing nut 300 and the locking cap 400, so as to prevent the fixing nut 300 and the locking cap 400 from loosening. Through locking of the inner and outer threads of the rotor 200, the reliability of the structure is increased. The material selected for the lock washer 500 has the characteristics of low saturated vapor pressure, high melting point, and good physical properties at high temperature, because the highest temperature of the target surface of the anode target disc during work reaches about 2500℃.

[0035] The anti-rotation structure includes an anti-rotation pin 201 and an anti-rotation pin hole matched therewith, as shown, Figure 3 Two anti-rotation pins 201 are symmetrically arranged on the target disc positioning end face 204, and the anti-rotation pin hole is located on the bottom of the target disc; the two are in clearance fit, and the fit clearance is 0.01mm~0.05mm. The positioning pin is made of tungsten.

[0036] In order to eliminate the risk of gas stagnation in the internal closed cavity, a communication channel between the cavity and the external high vacuum environment is established to realize directional drainage of the gas. As shown, Figure 4As shown, the target disc positioning end face 204 is provided with a rotor exhaust groove 202, which is in communication with the inside lower side and the outside of the X-ray tube; the bottom surface of the upper part of the locking cover 400 is provided with a locking cover exhaust groove 401 in a ring shape and uniformly distributed; the outer periphery of the middle threaded hole of the fixing nut 300 is provided with a nut exhaust hole 301 uniformly distributed, as shown in Figure 5 As shown, the locking cover exhaust groove 401 is in communication with the nut exhaust hole 301, and the gas on the upper side of the X-ray tube is exhausted, as shown in Figure 8 This design can effectively avoid the pressure fluctuation of the vacuum system caused by the slow escape of the residual gas in the sealed cavity, thereby maintaining the stability of the high vacuum environment. Specifically, the exhaust groove actively exhausts the gas (including the original air and the gas released by the material heated) in the cavity, preventing it from continuously infiltrating the vacuum environment and causing the vacuum degree to decay.

[0037] It can be understood that the above embodiments are only exemplary embodiments adopted for illustrating the principles of the present application, and the present application is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and essence of the present application, and these modifications and improvements are also considered as the protection scope of the present application.

Claims

1. An X-ray tube anode target disk fixing structure, comprising a rotor (200), characterized in that, An anode target plate (100), a fixing nut (300), an anti-loosening washer (500), and a locking cover (400) are sequentially installed on the rotor (200). The locking cover (400) presses the anti-loosening washer (500) tightly, causing the anti-loosening washer (500) to undergo elastic deformation between the fixing nut (300) and the locking cover (400). The anti-loosening washer (500) is a corrugated washer. An anti-rotation structure is provided between the rotor (200) and the anode target plate (100).

2. The X-ray tube anode target fixing structure as described in claim 1, characterized in that, The anti-loosening gasket (500) has 4 to 6 waveforms.

3. The X-ray tube anode target fixing structure as described in claim 1, characterized in that, The anti-loosening gasket (500) is made of molybdenum alloy or tungsten alloy.

4. The X-ray tube anode target fixing structure as described in claim 1, characterized in that, The rotor (200) and the anode target disk (100) are clearance fit.

5. The X-ray tube anode target fixing structure as described in claim 1, characterized in that, The rotor (200) has a target disk positioning shaft section (203) on the upper part, and the bottom of the target disk positioning shaft section (203) is the target disk positioning end face (204); the anode target disk (100) has a mounting hole (102), and the bottom of the target disk is located below the mounting hole (102); the target disk positioning shaft section (203) is located in the mounting hole (102).

6. The X-ray tube anode target fixing structure as described in claim 5, characterized in that, The clearance between the target disk positioning shaft section (203) and the mounting hole (102) is 0.005mm~0.008mm.

7. The X-ray tube anode target fixing structure as described in claim 1, characterized in that, The rotor (200) and the fixing nut (300) are threaded together; the rotor (200) and the locking cover (400) are threaded together.

8. The X-ray tube anode target fixing structure as described in claim 1, characterized in that, The anti-rotation structure includes a matching anti-rotation pin (201) and an anti-rotation pin hole. The two anti-rotation pins (201) are symmetrically arranged on the target disk positioning end face (204), and the anti-rotation pin hole is located at the bottom of the target disk.

9. The X-ray tube anode target fixing structure as described in claim 5, characterized in that, The bottom surface of the upper part of the locking cover (400) is evenly distributed with locking cover exhaust grooves (401), and the target plate positioning end face (204) is provided with rotor exhaust grooves (202).

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