A bipolar X-ray tube

Abstract

The present invention relates to the technical field of manufacturing X-ray tubes, and in particular to a bipolar X-ray tube. The invention comprises a cover body, wherein the cover body comprises a cathode body and an anode body respectively arranged on both sides of the cover body in an axial direction, a filament is arranged on one side of the cover body corresponding to the cathode body, a target plate is arranged in the cover body corresponding to the filament, a mounting shaft is arranged in the cover body, the target plate is arranged on the mounting shaft, and a preset distance is arranged between the target plate and the cathode body; the invention is characterized in that: the two ends of the mounting shaft are connected to the two ends of the cover body corresponding to the cathode body and the anode body, the mounting shaft comprises an axially connected insulating section and a conductive section, the insulating section is connected to the cathode body, and the conductive section is connected to the anode body. Compared with the existing cantilever structure with one end connected to the anode body, the invention has the advantage of high stability.

Description

Technical Field

[0001] The invention relates to the technical field of X-ray tube manufacturing, and in particular to a bipolar X-ray tube. Background Art

[0002] With the rapid development of the medical imaging industry, the requirements for X-ray tubes are becoming higher and higher, especially the rigidity requirements for target plate installation are greatly improved. For the mainstream bipolar tubes in the market, since the target plate needs to be insulated from the cathode body of the cover, the target plate is cantilevered, so that the target plate is completely isolated from the cathode body of the cover, such as a rotating anode rotor and CT tube with a built-in heat pipe provided in the Chinese patent application document with publication number CN 116130321 A. However, the cantilever structure will lead to poor stability of the target plate installation, especially when the target plate is installed on a rotating component, it will inevitably swing during the high-speed rotation of the target plate, thereby having a negative impact on the CT effect. Summary of the invention

[0003] In order to overcome the above-mentioned deficiencies of the prior art, the present invention provides a bipolar X-ray tube having the advantage of high stability in target plate installation.

[0004] In order to achieve the above object, the present invention is implemented through the following technical solutions:

[0005] A bipolar X-ray tube comprises a cover body, wherein the cover body comprises a cathode body and an anode body respectively arranged on both sides of the cover body in an axial direction, a filament is arranged on one side of the cover body corresponding to the cathode body, a target plate is arranged in the cover body corresponding to the filament, a mounting shaft is arranged in the cover body, the target plate is arranged on the mounting shaft, and a preset distance is arranged between the target plate and the cathode body; the characteristic is that: two ends of the mounting shaft are connected to two ends of the cover body corresponding to the cathode body and the anode body, the mounting shaft comprises an axially connected insulating section and a conductive section, the insulating section is connected to the cathode body, and the conductive section is connected to the anode body.

[0006] Based on the above structure, the principle of the bipolar X-ray tube is as follows: the conductive segment is connected to the anode body, so that the target disk is electrically connected to the anode body, and the insulating segment is connected to the cathode body, and due to the isolation of the insulating segment, the conductive segment and the target disk are electrically isolated from the cathode body, so that a potential difference is generated between the target disk and the cathode body to generate an electric field, and the filament generates electrons through external drive, and bombards the target disk under the drive of the electric field to generate X-rays. The bipolar X-ray tube described in the present application is axially connected to the two ends of the cathode body and the anode body corresponding to the cover body through the mounting shaft, and the target disk is mounted on the mounting shaft. Compared with the existing cantilever structure with one end connected to the anode body, it has the advantage of high stability. It should be noted that the cathode body and the anode body are not conductive to each other on the cover body, which is a common setting for the cover body of a bipolar X-ray tube.

[0007] Furthermore, in the bipolar X-ray tube of the present application, the cover body includes a filament cover, the filament cover is arranged on the cathode body, and the filament is arranged in the filament cover.

[0008] Furthermore, the bipolar X-ray tube of the present application further comprises a driving rotor, the driving rotor being connected to the target disk and rotatably arranged on the mounting shaft. As a preferred embodiment of the present application, the driving rotor is driven to rotate by a driving coil arranged outside the cover body, so as to drive the target disk to rotate around the mounting shaft.

[0009] Furthermore, the bipolar X-ray tube of the present application further comprises a mounting sleeve, the mounting sleeve is sleeved on the mounting shaft, the mounting sleeve and the mounting shaft are rotatably connected, and the drive rotor and the target plate are mounted on the mounting sleeve. As a preferred embodiment of the present application, the mounting sleeve, the drive rotor and the target plate integrally form an anode rotation system.

[0010] Furthermore, in the bipolar X-ray tube of the present application, a bearing medium is provided between the mounting sleeve and the mounting shaft. As a preferred embodiment of the present application, the bearing medium serves to reduce the resistance received by the mounting sleeve when rotating on the mounting shaft, and the bearing medium may be in the form of liquid metal, ball, or roller. The mounting sleeve, the mounting shaft, and the bearing medium integrally form a bearing. The forms of the bearings correspond to liquid metal bearings, ball bearings, and roller bearings, respectively.

[0011] Furthermore, in the bipolar X-ray tube described in the present application, an axially penetrating cooling channel is provided on the mounting shaft, and the cooling channel extends out of the outer end of the cover. As a preferred embodiment of the present application, the shaft body corresponding to the mounting target plate of the conventional bipolar X-ray tube is connected to the cover body at only one end, and the end of the shaft body near the filament is arranged inside the cover body. When cooling, the cooling medium cannot be axially passed out from the cover body, and only a loop can be arranged inside the rotating shaft, that is, the cooling medium enters from the connecting end of the shaft body and the cover body, and then passes out from this end. The bipolar X-ray tube described in the present application, based on the connection between the two ends of the mounting shaft and the cover body, is provided with an axially penetrating cooling channel on the mounting shaft, that is, the mounting shaft is in the form of a tube as a whole. When the bipolar X-ray tube described in the present application is working, the cooling medium axially flows in the cooling channel to achieve cooling of the target plate and other components connected to the mounting shaft. Compared with the conventional bipolar X-ray tube in which one end of the shaft is connected to the cover body and the other end is arranged in the cover body, when the diameter of the mounting shaft is constant, a cooling channel is also arranged in the shaft body. The conventional bipolar X-ray tube needs to arrange two cooling channels, one inlet and one outlet, in the shaft body, while the present application only needs to arrange one cooling channel. Therefore, the radial dimension of the cooling channel described in the present application can be arranged larger, thereby improving the cooling efficiency. Due to the improvement in cooling efficiency, the target plate of the bipolar X-ray tube described in the present application can be designed as a single metal or single graphite target plate, thereby achieving the advantage of saving the target plate cost.

[0012] Furthermore, in the bipolar X-ray tube of the present application, the mounting sleeve is provided with a mounting boss, and the drive rotor and the target plate are arranged on both axial sides of the mounting boss. As a preferred solution of the present application, the mounting boss realizes the axial positioning of the drive rotor and the target plate.

[0013] Furthermore, in the bipolar X-ray tube of the present application, a limiting nut is provided on the mounting sleeve, and the limiting nut is arranged on the side of the target plate away from the mounting boss. As a preferred solution of the present application, the target plate is arranged between the mounting boss and the limiting nut, and the limiting nut realizes the axial limitation of the target plate.

[0014] It can be seen from the above technical solution that the present invention has the following beneficial effects:

[0015] 1. The present invention provides a bipolar X-ray tube, which is axially connected to the two ends of the cover corresponding to the cathode body and the anode body through the installation shaft, and the target plate is installed on the installation shaft. Compared with the existing cantilever structure with one end connected to the anode body, it has the advantage of high stability.

[0016] 2. The present invention provides a bipolar X-ray tube. On the basis of the connection between the two ends of the mounting shaft and the cover body, an axially penetrating cooling channel is provided on the mounting shaft, that is, the mounting shaft is in the form of a tube as a whole. When the bipolar X-ray tube described in the present application is working, a cooling medium axially flows in the cooling channel to cool down the target plate and other components connected to the mounting shaft. Compared with the traditional bipolar X-ray tube, it has the advantage of high cooling efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic structural diagram of a bipolar X-ray tube according to an embodiment of the present application;

[0018] Figure 2 This is a structural diagram of a bearing device described in an embodiment of the present application.

[0019] In the figure: 1-cover; 101-cathode body; 102-anode body; 11-filament cover; 2-filament; 3-target plate; 4-mounting shaft; 40-cooling channel; 41-insulating section; 42-conductive section; 5-driving rotor; 6-mounting sleeve; 61-mounting boss; 62-limiting nut. DETAILED DESCRIPTION

[0020] Example 1

[0021] With the rapid development of the medical imaging industry, the requirements for X-ray tubes are getting higher and higher, especially the rigidity requirements for target plate installation are greatly improved. For the mainstream bipolar tubes in the market, since the target plate needs to be insulated from the cathode body of the cover, the target plate is cantilevered, so that the target plate is completely isolated from the cathode body of the cover, such as a rotating anode rotor and CT tube with a built-in heat pipe provided by publication number CN 116130321 A. However, the cantilever structure will lead to poor stability of the target plate installation, especially when the target plate is installed on a rotating component, it will inevitably swing during the high-speed rotation of the target plate, which will have a negative impact on the CT effect.

[0022] Combined with this Figure 1 and 2As shown, this embodiment provides a bipolar X-ray tube, including a cover body 1, wherein the cover body 1 includes a cathode body 101 and an anode body 102 respectively arranged on both sides of the cover body 1 in an axial direction, wherein a filament 2 is provided on one side of the cover body 1 corresponding to the cathode body 101, and a target plate 3 is provided in the cover body 1 corresponding to the filament 2, wherein a mounting shaft 4 is provided in the cover body 1, wherein the target plate 3 is arranged on the mounting shaft 4, and a preset distance is provided between the target plate 3 and the cathode body 101; it is characterized in that: two ends of the mounting shaft 4 are connected to two ends of the cover body 1 corresponding to the cathode body 101 and the anode body 102, and the mounting shaft 4 includes an axially connected insulating segment 41 and a conductive segment 42, wherein the insulating segment 41 is connected to the cathode body 101, and the conductive segment 42 is connected to the anode body 102.

[0023] Based on the above structure, the principle of the bipolar X-ray tube is as follows: the conductive segment 42 is connected to the anode body 102, so that the target plate 3 is electrically connected to the anode body 102, and the insulating segment 41 is connected to the cathode body 101, and due to the isolation of the insulating segment 41, the conductive segment 42 and the target plate 3 are electrically isolated from the cathode body 101, so that a potential difference is generated between the target plate 3 and the cathode body 101 to generate an electric field, and the filament 2 generates electrons through external drive, and bombards the target plate 3 under the drive of the electric field to generate X-rays. The bipolar X-ray tube described in the present application is axially connected to the two ends of the cover body 1 corresponding to the cathode body 101 and the anode body 102 through the mounting shaft 4, and the target plate 3 is mounted on the mounting shaft 4, relative to the existing cantilever structure with one end connected to the anode body 102 (it should be noted that when in use, the corresponding Figure 1 The bipolar X-ray tube shown is horizontally placed as a whole, and has the advantage of high stability. It should be noted that the cathode body 101 and the anode body 102 on the cover body 1 are not connected to each other, which is a common setting of the bipolar X-ray tube cover body. In this embodiment, the material of the insulating section 41 is ceramic, and the material of the conductive section 42 is conductive metal, and the two are axially connected by brazing. Both ends of the mounting shaft 4 are welded to the cover body 1.

[0024] In this embodiment, the housing 1 includes a filament housing 11 . The filament housing 11 is disposed on the cathode body 101 , and the filament 2 is disposed in the filament housing 11 .

[0025] In this embodiment, a driving rotor 5 is further included, the driving rotor 5 is connected to the target plate 3, and the driving rotor 5 is rotatably arranged on the mounting shaft 4. The driving rotor 5 is driven to rotate by a driving coil arranged outside the cover body 1, so as to drive the target plate 3 to rotate around the mounting shaft 4.

[0026] In this embodiment, a mounting sleeve 6 is further included, wherein the mounting sleeve 6 is sleeved on the mounting shaft 4, the mounting sleeve 6 is rotatably connected to the mounting shaft 4, and the driving rotor 5 and the target disc 3 are mounted on the mounting sleeve 6. The mounting sleeve 6, the driving rotor 5 and the target disc 3 integrally form an anode rotating system.

[0027] In this embodiment, a bearing medium is provided between the mounting sleeve 6 and the mounting shaft 4. The bearing medium serves to reduce the resistance received by the mounting sleeve 6 when rotating on the mounting shaft 4. The bearing medium may be in the form of liquid metal, balls, or rollers. The mounting sleeve 6, the mounting shaft 4, and the bearing medium integrally form a bearing. The forms of the bearings correspond to liquid metal bearings, ball bearings, and roller bearings, respectively.

[0028] The shaft body corresponding to the target plate installation of the traditional bipolar X-ray tube is connected to the cover body at only one end, and the end of the shaft body near the filament is arranged inside the cover body. When cooling, the cooling medium cannot be axially passed out of the cover body, and only a loop can be set inside the rotating shaft, that is, the cooling medium enters from the connection end of the shaft body and the cover body, and then passes out from this end. In this regard, in this embodiment, the installation shaft 4 is provided with an axially through cooling channel 40, and the cooling channel 40 extends out of the outer end of the cover body 1. A bipolar X-ray tube described in this embodiment is based on the connection between the two ends of the installation shaft 4 and the cover body 1, and an axially through cooling channel 40 is provided on the installation shaft 4, that is, the installation shaft 4 is a tube as a whole. When the bipolar X-ray tube described in this application is working, the cooling medium axially flows in the cooling channel 40 to achieve cooling of the target plate 3 and other components connected to the installation shaft 4. Compared with the conventional bipolar X-ray tube in which one end of the shaft is connected to the cover body and the other end is arranged in the cover body, when the diameter of the mounting shaft 4 is constant, a cooling channel is also arranged in the shaft body. The conventional bipolar X-ray tube needs to arrange two cooling channels, one inlet and one outlet, in the shaft body, while the present application only needs to arrange one cooling channel 40. Therefore, the radial dimension of the cooling channel 40 described in the present application can be arranged larger, thereby improving the cooling efficiency. Due to the improvement of the cooling efficiency, in the bipolar X-ray tube described in the present application, the target plate 3 can be designed as a single metal or single graphite target plate, thereby achieving the advantage of saving the target plate cost.

[0029] In this embodiment, a mounting boss 61 is provided on the mounting sleeve 6, and the driving rotor 5 and the target plate 3 are arranged on both axial sides of the mounting boss 61. The mounting boss 61 realizes the axial positioning of the driving rotor 5 and the target plate 3.

[0030] In this embodiment, a limiting nut 62 is provided on the mounting sleeve 6, and the limiting nut 62 is arranged on the side of the target plate 3 away from the mounting boss 61. The target plate 3 is arranged between the mounting boss 61 and the limiting nut 62, and the limiting nut 62 realizes the axial limitation of the target plate 3.

[0031] Example 2

[0032] A bearing device for a bipolar X-ray tube as described in Example 1, such as Figure 2 As shown, it includes the installation shaft 4 described in Example 1, the installation shaft 4 includes an axially connected insulating section 41 and a conductive section 42, and also includes a mounting sleeve 6, the mounting sleeve 6 is sleeved on the installation shaft 4, the mounting sleeve 6 and the installation shaft 4 are rotatably connected, and a bearing medium is provided between the mounting sleeve 6 and the installation shaft 4.

[0033] Based on the above bearing device, the two ends of the 4= can be connected to the cathode body 101 and the anode body 102 of the cover body 1, and the target plate 3 is installed on the mounting sleeve 6, which can improve the rotation stability of the target plate 3.

[0034] Furthermore, in this embodiment, the mounting shaft 4 is provided with an axially penetrating cooling channel 40, which can improve the cooling efficiency.

[0035] Furthermore, in this embodiment, a mounting boss 61 is provided on the mounting sleeve 6 to limit the target disc 3 and the driving rotor 5 mounted on the mounting sleeve 6 in the axial direction.

[0036] The technical principles of the present invention are described above in conjunction with specific embodiments. These descriptions are only for explaining the principles of the present invention and cannot be interpreted as limiting the scope of protection of the present invention in any way. Based on the explanations herein, those skilled in the art can associate other specific implementations of the present invention without creative work, and these methods will fall within the scope of protection of the present invention.

Claims

1. A bipolar X-ray tube, comprising a housing (1), the housing (1) comprising a cathode body (101) and an anode body (102) respectively arranged on two axial sides of the housing (1), a filament (2) being arranged on one side of the housing (1) corresponding to the cathode body (101), a target plate (3) being arranged in the housing (1) corresponding to the filament (2), a mounting shaft (4) being arranged in the housing (1), the target plate (3) being arranged on the mounting shaft (4), and a preset distance being arranged between the target plate (3) and the cathode body (101); characterized in that: The two ends of the installation shaft (4) are connected to the two ends of the cover body (1) corresponding to the cathode body (101) and the anode body (102), and the installation shaft (4) comprises an axially connected insulating section (41) and a conductive section (42), the insulating section (41) being connected to the cathode body (101), and the conductive section (42) being connected to the anode body (102); It also comprises a driving rotor (5), the driving rotor (5) being connected to the target plate (3), and the driving rotor (5) being rotatably disposed on the mounting shaft (4); It also includes a mounting sleeve (6), the mounting sleeve (6) being sleeved on the mounting shaft (4), the mounting sleeve (6) being rotatably connected to the mounting shaft (4), and the driving rotor (5) and the target disc (3) being mounted on the mounting sleeve (6); The mounting sleeve (6) is provided with a mounting boss (61), and the driving rotor (5) and the target disc (3) are arranged on two axial sides of the mounting boss (61).

2. A bipolar X-ray tube according to claim 1, characterized in that: The cover body (1) comprises a filament cover (11), the filament cover (11) is arranged on the cathode body (101), and the filament (2) is arranged inside the filament cover (11).

3. A bipolar X-ray tube according to claim 1, characterized in that: A bearing medium is provided between the mounting sleeve (6) and the mounting shaft (4).

4. A bipolar X-ray tube according to claim 1, characterized in that: The mounting shaft (4) is provided with an axially penetrating cooling channel (40), and the cooling channel (40) extends out of the outer end of the cover body (1).

5. A bipolar X-ray tube according to claim 1, characterized in that: A limiting nut (62) is provided on the mounting shaft sleeve (6), and the limiting nut (62) is arranged on a side of the target plate (3) away from the mounting boss (61).

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