Anode driving structure of X-ray tube

Abstract

The utility model discloses an anode driving structure of an X-ray tube, the X-ray tube comprises a tube shell, an anode bearing and an anode target disc arranged in the tube shell, the anode driving structure comprises an anode rotating shaft, a driving assembly and a controller, the anode rotating shaft is fixedly connected with the anode target disc and the anode bearing at the same time, and the driving assembly is fixedly connected with the controller. The driving assembly is arranged on the periphery of the anode rotating shaft in the circumferential direction, the driving assembly is electrically connected with the controller and generates a magnetic field under driving of the controller, and the anode rotating shaft rotates under the action of the magnetic field and drives the anode target disc to rotate synchronously. According to the anode driving structure of the X-ray tube, on the premise that the ball bearing does not need to be replaced, the load capacity of the anode is greatly improved, and the whole anode achieves high load and meets the working requirement of high rotating speed at the same time.

Description

Technical Field

[0001] The utility model relates to the technical field of X-ray tubes, in particular to an anode driving structure of an X-ray tube. Background Art

[0002] The rotating anode X-ray tube is a component of X-ray diagnostic equipment that shortens the exposure time of X-ray photography and obtains clear images. In the rotating anode X-ray tube, the anode bearing can drive the anode target to rotate continuously at high speed, so that the high-speed electron beam is accelerated and bombarded on a circular track belt. The heat energy generated is also distributed on the annular area of ​​the anode target, which greatly improves the instantaneous power of the X-ray tube. However, since only about 1% of the energy loaded on the X-ray tube is converted into X-rays, and 99% of the energy is converted into heat energy and dissipated on the anode of the X-ray tube. Therefore, while increasing the power of the X-ray tube, the temperature of the anode of the X-ray tube and the entire X-ray tube assembly will also rise rapidly. When the X-ray tube is working normally, the temperature of the bombardment point on the anode target can reach 2600℃~2700℃. In order for the X-ray tube to be able to carry higher working power, it is usually necessary to select an anode target with a larger heat capacity and achieve a higher anode rotation speed (at least 12,000 revolutions per minute, i.e. 200Hz). In order to increase the heat capacity of the anode target, a graphite disk with a large specific heat capacity coefficient is brazed on a metal disk with a molybdenum alloy as the base and a tungsten-rhenium alloy as the base. This also means that the anode rotating assembly needs to withstand a larger load, and its rotation performance plays a vital role in the performance of the entire rotating anode X-ray tube.

[0003] Existing ball bearings are limited by their structure and cannot meet the requirements of high load and high speed. Liquid metal bearings can achieve high load and high speed, and they use liquid metal to replace the balls of traditional bearings. However, liquid metal bearings have extremely high machining requirements and need to go through a series of complex processing processes: parts cleaning, contact surface hardening, laser etching, liquid metal injection, etc. At the same time, due to the characteristics of liquid metal itself, it cannot be in a low temperature state; or it needs to be matched with excellent cooling at a high temperature of about 400 degrees. Once the liquid metal fails, the X-ray tube will no longer work properly. Utility Model Content

[0004] In view of the deficiencies in the prior art, the utility model provides an anode drive structure for an X-ray tube. The anode drive structure for the X-ray tube greatly improves the anode load capacity without replacing the ball bearing. The entire anode achieves high load and meets high speed working requirements.

[0005] The utility model is realized by the following technical solutions:

[0006] An anode drive structure of an X-ray tube, the X-ray tube comprising a tube shell, an anode bearing and an anode target plate arranged in the tube shell, the anode drive structure comprising an anode rotating shaft, a drive assembly and a controller, the anode rotating shaft is fixedly connected to the anode target plate and the anode bearing at the same time, the drive assembly is circumferentially arranged on the periphery of the anode rotating shaft, and the drive assembly is electrically connected to the controller and generates a magnetic field under the drive of the controller, the anode rotating shaft rotates under the action of the magnetic field and drives the anode target plate to rotate synchronously.

[0007] Furthermore, the anode rotating shaft comprises a rotating shaft frame and a plurality of magnets. The rotating shaft frame is fixedly connected to the anode target plate and the anode bearing at the same time. The plurality of magnets are circumferentially arranged on the periphery of the rotating shaft frame.

[0008] Furthermore, the rotating shaft frame is provided with a plurality of grooves at positions corresponding to the magnets, and the magnets are at least partially received in the corresponding grooves.

[0009] Furthermore, the rotating shaft frame is cylindrical and has a groove portion on it. The bottom wall of the groove portion is fixed between the anode target plate and the anode bearing. The outer side of the side wall of the groove portion is provided with a plurality of grooves. The anode bearing is at least partially accommodated in the groove portion.

[0010] Furthermore, a plurality of grooves are evenly spaced and arranged on the outer side of the side wall.

[0011] Furthermore, the magnet is in the shape of an elongated strip, and the axial direction of the magnet is consistent with the axial direction of the rotating shaft frame.

[0012] Furthermore, the magnet is bonded to the rotating shaft frame.

[0013] Furthermore, the anode rotating shaft is arranged in the tube shell.

[0014] Furthermore, the driving assembly is circumferentially arranged on the periphery of the tube shell.

[0015] Furthermore, the driving assembly includes a skeleton and a plurality of coils wound on the skeleton, the skeleton is circumferentially arranged on the periphery of the anode rotating shaft, the coils are electrically connected to the controller, the controller controls the current between the plurality of coils and generates a magnetic field, the anode rotating shaft rotates under the action of the magnetic field and drives the anode target plate to rotate synchronously.

[0016] Compared with the prior art, the advantages of the present invention are:

[0017] 1. By setting the anode shaft with the drive component, the anode drive load capacity is greatly improved, and the high load can meet the high speed working requirements.

[0018] 2. By designing the number of magnets in the anode shaft and the number of coils in the drive assembly, it can be adjusted according to different anode loads to meet the anode drive frequency and start-up time requirements. Among them, the anode drive frequency can be increased to 200Hz at most, and the start-up response speed is fast, less than 0.2 seconds. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic structural diagram of an anode drive structure of an X-ray tube according to an embodiment of the utility model;

[0020] Figure 2 It is a front view of an anode drive structure of an X-ray tube;

[0021] Figure 3 for Figure 2 Sectional view along AA;

[0022] Figure 4 A schematic diagram of a portion of the structure of an anode drive of an X-ray tube.

[0023] 1. Tube shell; 2. Anode target plate; 3. Anode bearing; 4. Anode shaft; 40. Shaft frame; 400. Groove; 401. Groove; 402. Bottom wall; 403. Side wall; 41. Magnet; 5. Driving assembly; 50. Skeleton; 51. Coil. DETAILED DESCRIPTION

[0024] The following is a further non-restrictive detailed description of the utility model technical solution in conjunction with the preferred embodiment and its accompanying drawings. In the description of the utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings. In addition, the terms "first" and "second" are used only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the utility model, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the utility model, and cannot be understood as limitations on the utility model.

[0025] like Figure 1-Figure 4As shown, an anode drive structure of an X-ray tube according to an embodiment of the utility model, the X-ray tube comprises a tube shell 1, an anode bearing 3 and an anode target plate 2 arranged in the tube shell 1, wherein the anode drive structure comprises an anode rotating shaft 4, a drive assembly 5 and a controller, the anode rotating shaft 4 is fixedly connected to the anode target plate 2 and the anode bearing 3 at the same time, the drive assembly 5 is circumferentially arranged on the periphery of the anode rotating shaft 4, and the drive assembly 5 is electrically connected to the controller and generates a magnetic field under the drive of the controller, the anode rotating shaft 4 rotates under the action of the magnetic field and drives the anode target plate 2 to rotate synchronously.

[0026] In this embodiment, the anode rotating shaft 4 is fixedly connected to the anode target plate 2 and the anode bearing 3 by screws.

[0027] The anode shaft 4 includes a shaft frame 40 and a plurality of magnets 41. The shaft frame 40 is fixedly connected to the anode target plate 2 and the anode bearing 3. The plurality of magnets 41 are circumferentially arranged on the periphery of the shaft frame 40. It is worth noting that the magnets 41 can be conductive magnets or permanent magnets.

[0028] Specifically, a plurality of grooves 400 are formed on the rotating shaft frame 40 at positions corresponding to the magnets 41 , and the magnets 41 are at least partially received in the corresponding grooves 400 .

[0029] In this embodiment, the rotating shaft frame 40 is cylindrical, and a groove portion 401 is formed on the rotating shaft frame 40. The bottom wall 402 forming the groove portion 401 is fixed between the anode target plate 2 and the anode bearing 3. A plurality of grooves 400 are formed on the outer side of the side wall 403 forming the groove portion 401. The anode bearing 3 is at least partially received in the groove portion 401, and the plurality of grooves 400 are evenly spaced and arranged on the outer side of the side wall 403.

[0030] The magnet 41 is in a long strip shape, and the axial direction of the magnet 41 is consistent with the axial direction of the rotating shaft frame 40 .

[0031] The magnet 41 is bonded to the rotating shaft frame 40 .

[0032] In this embodiment, the anode rotating shaft 4 is disposed in the tube shell 1 , and the driving assembly 5 is circumferentially disposed on the periphery of the tube shell 1 .

[0033] Specifically, the driving assembly 5 includes a skeleton 50 and a plurality of coils 51 wound around the skeleton 50. The skeleton 50 is circumferentially arranged on the periphery of the anode shaft 4. The coils 51 are electrically connected to a controller. The controller controls the current between the plurality of coils 51 and generates a magnetic field. The anode shaft 4 rotates under the action of the magnetic field and drives the anode target plate 2 to rotate synchronously.

[0034] During operation, the controller controls the current between the multiple coils 51 and generates a magnetic field. The anode shaft 4 rotates under the action of the magnetic field and drives the anode target plate 2 to rotate synchronously. According to the load of the entire anode, the number of magnets 41 on the anode shaft 4 and the number of coils 51 of the external drive component 5 are adjusted to increase the driving force of the entire magnetic field, realize a large anode load, and adjust the anode start time to quickly respond to the exposure requirements of the X-ray tube.

[0035] Beneficial effects of the utility model:

[0036] 1. By setting the anode shaft 4 and the drive component 5 together, the anode drive load capacity is greatly improved, and the high load can meet the high speed working requirements at the same time.

[0037] 2. By designing the number of magnets 41 in the anode shaft 4 and the number of coils 51 in the drive assembly 5, it can be adjusted according to different anode loads to meet the anode drive frequency and start-up time requirements. Among them, the anode drive frequency can be increased to 200Hz at most, and the start-up response speed is fast, less than 0.2 seconds.

[0038] The above-mentioned embodiments only express several implementation methods of the utility model, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent of the utility model. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the utility model, and these all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. An anode drive structure of an X-ray tube, the X-ray tube comprising a tube shell (1), an anode bearing (3) and an anode target plate (2) arranged in the tube shell (1), characterized in that: The anode drive structure comprises an anode rotating shaft (4), a drive assembly (5) and a controller; the anode rotating shaft (4) is fixedly connected to the anode target plate (2) and the anode bearing (3); the drive assembly (5) is circumferentially arranged on the periphery of the anode rotating shaft (4); the drive assembly (5) is electrically connected to the controller and generates a magnetic field under the drive of the controller; the anode rotating shaft (4) rotates under the action of the magnetic field and drives the anode target plate (2) to rotate synchronously.

2. The anode driving structure according to claim 1, characterized in that: The anode rotating shaft (4) comprises a rotating shaft frame (40) and a plurality of magnets (41); the rotating shaft frame (40) is fixedly connected to the anode target plate (2) and the anode bearing (3); and the plurality of magnets (41) are circumferentially arranged on the periphery of the rotating shaft frame (40).

3. The anode driving structure according to claim 2, characterized in that: The rotating shaft frame (40) is provided with a plurality of grooves (400) at positions corresponding to the magnets (41), and the magnets (41) are at least partially received in the corresponding grooves (400).

4. The anode driving structure according to claim 3, characterized in that: The rotating shaft frame (40) is cylindrical, and a groove portion (401) is formed on the rotating shaft frame (40), a bottom wall (402) of the groove portion (401) is fixed between the anode target plate (2) and the anode bearing (3), a side wall (403) of the groove portion (401) is formed with a plurality of grooves (400) on the outside, and the anode bearing (3) is at least partially received in the groove portion (401).

5. The anode driving structure according to claim 4, characterized in that: A plurality of grooves (400) are evenly spaced and arranged on the outer side of the side wall (403).

6. The anode driving structure according to claim 2, characterized in that: The magnet (41) is in the shape of an elongated strip, and the axial direction of the magnet (41) is consistent with the axial direction of the rotating shaft frame (40).

7. The anode driving structure according to claim 2, characterized in that: The magnet (41) is bonded to the rotating shaft frame (40).

8. The anode driving structure according to claim 1, characterized in that: The anode rotating shaft (4) is arranged inside the tube shell (1).

9. The anode driving structure according to claim 1, characterized in that: The driving assembly (5) is circumferentially arranged on the periphery of the tube shell (1).

10. The anode driving structure according to claim 1, characterized in that: The driving assembly (5) comprises a frame (50) and a plurality of coils (51) wound around the frame (50); the frame (50) is circumferentially arranged on the periphery of the anode rotating shaft (4); the coils (51) are electrically connected to the controller; the controller controls the current between the plurality of coils (51) and generates a magnetic field; the anode rotating shaft (4) rotates under the action of the magnetic field and drives the anode target plate (2) to rotate synchronously.

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