X-ray tube

Abstract

The utility model discloses an X -ray tube, including shell and the tube core subassembly of setting in the shell inside, and the tube core subassembly includes the shell, cathode subassembly, first getter, second core column, heating wire and second getter, and the vacuum environment is inside the shell, and cathode subassembly includes cathode shell body, cathode bottom plate and the work lamp filament fixed on cathode bottom plate, and the work lamp filament is used for emitting first electron, and the cathode shell body is fixed in the cathode end of shell, and the first core column that is connected with the work lamp filament is arranged in the cathode shell body, and the first getter is located in the shell and is connected on the first core column, and the second core column is fixed on the shell, and the second core column is connected direct current source, and the heating wire is located in the shell, and the heating wire is connected with the second core column, and the second getter is located in the shell and is connected on the second core column. The utility model solves the problem of the insufficient vacuum maintenance ability caused by the dependence of the work lamp filament for the activation of the getter in the prior art.

Description

Technical Field

[0001] This utility model relates to the field of X-ray tube technology, and in particular to an X-ray tube. Background Technology

[0002] In traditional X-ray tube core assembly designs, the getter is typically configured in a single configuration, meaning only one getter is placed inside the cathode assembly. This getter is activated by electrical power supplied from the working filament wiring (high-voltage socket). When the X-ray tube is in operation, the heat generated by the current flowing through the working filament wiring is conducted to the getter, bringing it to its activation temperature and enabling it to draw in residual gas. This removes residual gas from the core, ensuring the vacuum level of the X-ray tube and maintaining its normal discharge performance.

[0003] However, this method of indirectly activating the getter by heating the working filament has obvious drawbacks: when the X-ray tube is not in operation or is running at low power, the working filament does not generate enough heat, which makes it impossible to effectively activate the getter and reduces the vacuum maintenance capability; in addition, the range of action of a single getter is limited, making it difficult to fully cover the internal space of the tube core. Especially in modern X-ray tubes with high power and high heat load, the risk of local gas accumulation increases significantly, thereby affecting the stability and service life of the device. Utility Model Content

[0004] To address the shortcomings of existing technologies, this invention provides an X-ray tube that solves the problem of insufficient vacuum maintenance caused by the reliance on the working filament for degassing agent activation.

[0005] This utility model is achieved through the following technical solution:

[0006] An X-ray tube includes a housing and a die assembly disposed inside the housing, the die assembly comprising:

[0007] The tube shell is a vacuum environment inside;

[0008] A cathode assembly includes a cathode housing, a cathode base plate, and a working filament fixed on the cathode base plate. The working filament is used to emit a first electron. The cathode housing is fixed to the cathode end of the tube housing, and a first core post connected to the working filament is provided inside the cathode housing.

[0009] The first degassing agent is located inside the tube shell and connected to the first core column;

[0010] The second core post is fixed on the tube shell and is connected to an external DC power supply.

[0011] A heating wire is located inside the tube shell and is connected to the second core post;

[0012] The second degassing agent is located inside the tube shell and connected to the second core column.

[0013] Furthermore, the sidewall of the tube shell protrudes outward to form an installation cylinder, and a cover plate is fixed at the opening of the installation cylinder. The second core column passes through the cover plate and is fixedly connected to the cover plate.

[0014] Furthermore, the cover plate is made of ceramic or glass, and the second core post is fixed to the cover plate by brazing.

[0015] Furthermore, the mounting cylinder is located at the negative end of the tube shell.

[0016] Furthermore, an exhaust pipe is provided at the cathode end of the tube shell, and the mounting cylinder and the exhaust pipe are symmetrically arranged about the cathode shell.

[0017] Furthermore, the cathode housing is made of ceramic or glass, and the first core post is fixed to the cathode housing by brazing.

[0018] Furthermore, the outer casing is equipped with conductive terminals that are connected to the second core post, and the conductive terminals are used to electrically connect to the DC power supply.

[0019] Furthermore, it also includes an anode assembly comprising a rotatable anode target disk, the anode target disk including an annular target surface that receives a first electron bombardment and generates X-rays.

[0020] Furthermore, the cathode base plate is also provided with an exhaust filament connected to the first core column. The exhaust filament is used to emit a second electron. During the exhaust phase of the core assembly, the annular target surface receives the second electron bombardment to release the gas in the anode target disk.

[0021] Furthermore, the working filament and the exhaust filament are arranged symmetrically about the axis of the anode target disk.

[0022] Compared with existing technologies, the advantages of this utility model are:

[0023] 1. By adding an additional second degassing agent, the adsorption capacity for gases inside the tube can be further enhanced, especially in maintaining the stability of the vacuum environment after long-term operation of the device.

[0024] 2. By designing the second getter to be activated by a heating wire, which is independently powered by a DC power supply, it can be started independently during X-ray tube shutdown or low load periods, ensuring that the heating wire can continuously receive a stable current, thereby maintaining the active state of the second getter, continuously adsorbing trace amounts of gas in the tube shell, and continuously maintaining the vacuum level. Attached Figure Description

[0025] Figure 1 Cross-section of the die assembly Figure 1 ;

[0026] Figure 2 This is a cross-sectional view of an X-ray tube;

[0027] Figure 3 Cross-section of the die assembly Figure 2 ;

[0028] Figure 4 This is a partial cross-sectional view of the die assembly.

[0029] 100. Outer shell; 110. Conductive terminal; 200. Core assembly; 300. Shell; 310. Mounting cylinder; 320. Cover plate; 330. Exhaust pipe; 400. Cathode assembly; 410. Cathode shell; 420. Cathode base plate; 430. Working filament; 440. First core column; 450. Exhaust filament; 500. First getter; 600. Second core column; 700. Heating wire; 800. Second getter; 900. Anode assembly; 910. Anode target plate; 911. Annular target surface. Detailed Implementation

[0030] The following detailed, non-limiting description of the utility model's technical solution, in conjunction with preferred embodiments and accompanying drawings, is provided. In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0031] like Figures 1-4 As shown, an embodiment of the present invention provides an X-ray tube, including a housing 100 and a core assembly 200 disposed inside the housing 100. The core assembly 200 includes a housing 300, a cathode assembly 400, a first getter 500, a second core 600, a heating wire 700, and a second getter 800. The housing 300 is a vacuum environment. The cathode assembly 400 includes a cathode housing 410, a cathode base plate 420, and a working filament 430 fixed on the cathode base plate 420. The working filament 430 is used to emit the first... In this device, the cathode housing 410 is fixed to the cathode end of the tube housing 300, and a first core post 440 connected to the working filament 430 is disposed inside the cathode housing 410. A first getter 500 is located inside the tube housing 300 and connected to the first core post 440. A second core post 600 is fixed to the tube housing 300 and is externally connected to a DC power supply. A heating wire 700 is located inside the tube housing 300 and connected to the second core post 600. A second getter 800 is located inside the tube housing 300 and connected to the second core post 600. By providing an additional second getter 800, the adsorption capacity for gases inside the tube housing 300 can be further enhanced, especially in maintaining the stability of the vacuum environment after long-term operation of the device.

[0032] A conductive terminal 110 connected to the second core post 600 is mounted on the outer casing 100. The conductive terminal 110 is used for electrical connection to a DC power supply. Since the first getter 500 relies on the working filament 430 for activation, the heat generated when current is applied to the working filament 430 is conducted to the first getter 500, causing it to reach its activation temperature and perform its gas-absorbing function. However, when the X-ray tube is not in operation or running at low power, the working filament 430 generates insufficient heat, resulting in the first getter 500 failing to activate effectively, thus reducing vacuum maintenance capability. The second getter 800, on the other hand, relies on the heating wire 700 for activation. Since the heating wire 700 is independently powered by a DC power supply outside the outer casing 100, it can be independently started during X-ray tube shutdown or low load periods, ensuring that the heating wire 700 continuously receives a stable current, thereby maintaining the active state of the second getter 800 and continuously adsorbing trace amounts of gas within the tube casing 300, thus maintaining the vacuum level. This dual getter synergistic working mechanism significantly improves the stability and reliability of the vacuum device under different operating conditions.

[0033] like Figure 1As shown, the sidewall of the tube shell 300 protrudes outward to form an mounting cylinder 310. A cover plate 320 is fixed to the opening of the mounting cylinder 310, and the second core post 600 passes through the cover plate 320 and is fixedly connected to the cover plate 320. The tube shell 300 is made of metal, ceramic, or glass. In this embodiment, the tube shell 300 is preferably made of metal, the cover plate 320 is made of ceramic or glass, and the cover plate 320 is sealed and fixed to the opening of the mounting cylinder 310 by brazing. The second core post 600 is fixed to the cover plate 320 by brazing.

[0034] The mounting cylinder 310 is located at the cathode end of the housing 300. An exhaust pipe 330 is also provided at the cathode end of the housing 300. The mounting cylinder 310 and the exhaust pipe 330 are symmetrically arranged about the cathode housing 410. The exhaust pipe 330 is used for vacuuming before encapsulation and for subsequent sealing. Specifically, during the venting stage of the core assembly 200, the vacuuming device is connected to the exhaust pipe 330 on the housing 300. After venting is completed, i.e., when the vacuum level in the vacuum chamber reaches the working requirements, the user cuts the exhaust pipe 330 with a cutting tool, disconnecting the exhaust pipe 330 from the vacuuming device. The cut point of the vacuuming device self-seals after being cut by the cutting tool. A hydraulic clamp is used as the cutting tool. The exhaust pipe 330 can be made of copper, nickel, iron, or their alloys.

[0035] The cathode housing 410 is made of ceramic or glass and is fixed to the tube housing 300 by brazing. The first core post 440 is fixed to the cathode housing 410 by brazing.

[0036] The die assembly 200 also includes an anode assembly 900, which includes a rotatable anode target disk 910, which includes an annular target surface 911 that receives a first electron bombardment and generates X-rays.

[0037] An exhaust filament 450, connected to the first core post 440, is still provided on the cathode base plate 420. The exhaust filament 450 is used to emit second electrons. During the exhaust phase of the die assembly 200, the annular target surface 911 receives the second electron bombardment to release the gas in the anode target disk 910. In this embodiment, the bombardment areas of the first and second electrons are consistent, ensuring that the annular target surface 911 is directly bombarded by the second electrons during the exhaust phase, thereby maximizing the temperature at the annular target surface 911 and effectively promoting the full release of the gas inside the anode material at the annular target surface 911. It can be understood that the exhaust filament 450 completely simulates the electron emission path and bombardment position of the working filament 430, ensuring that the heat distribution of the annular target surface 911 during the exhaust process is highly consistent with the X-ray generation area under normal operating conditions, thereby ensuring that the exhaust effect matches the actual operating conditions and improving the stability and reliability of the die assembly in subsequent use.

[0038] In this embodiment, the working filament 430 and the exhaust filament 450 are symmetrically arranged about the X-axis of the anode target disk 910. At this time, the working filament 430 and the exhaust filament 450 are at their farthest distance, and the thermal interference between them is minimized. This effectively avoids the cumulative effect of heat radiation from the exhaust filament to the working filament when it is operating at high temperature, and further ensures the structural stability and material properties of the working filament during the non-working phase.

[0039] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. An X-ray tube, comprising a housing (100) and a core assembly (200) disposed within the housing (100), characterized in that, The die assembly (200) includes: The tube shell (300) is a vacuum environment inside; The cathode assembly (400) includes a cathode housing (410), a cathode base plate (420), and a working filament (430) fixed on the cathode base plate (420). The working filament (430) is used to emit a first electron. The cathode housing (410) is fixed to the cathode end of the tube housing (300), and a first core post (440) connected to the working filament (430) is provided inside the cathode housing (410). The first degassing agent (500) is located inside the shell (300) and connected to the first core column (440); The second core post (600) is fixed on the tube shell (300) and is connected to an external DC power supply. A heating wire (700) is located inside the tube shell (300) and is connected to the second core post (600); The second degassing agent (800) is located inside the housing (300) and connected to the second core (600).

2. The X-ray tube according to claim 1, characterized in that, The sidewall of the tube shell (300) protrudes outward to form an installation cylinder (310), and a cover plate (320) is fixed at the opening of the installation cylinder (310). The second core column (600) passes through the cover plate (320) and is fixedly connected to the cover plate (320).

3. The X-ray tube according to claim 2, characterized in that, The cover plate (320) is made of ceramic or glass, and the second core post (600) is fixed to the cover plate (320) by brazing.

4. The X-ray tube according to claim 2, characterized in that, The mounting sleeve (310) is located at the negative end of the casing (300).

5. The X-ray tube according to claim 4, characterized in that, The cathode end of the tube shell (300) is also provided with an exhaust pipe (330), and the mounting cylinder (310) and the exhaust pipe (330) are symmetrically arranged about the cathode shell (410).

6. The X-ray tube according to claim 1, characterized in that, The cathode housing (410) is made of ceramic or glass, and the first core post (440) is fixed to the cathode housing (410) by brazing.

7. The X-ray tube according to claim 1, characterized in that, The housing (100) is equipped with a conductive terminal (110) connected to the second core post (600), and the conductive terminal (110) is used to electrically connect to the DC power supply.

8. The X-ray tube according to claim 1, characterized in that, It also includes an anode assembly (900) comprising a rotatable anode target disk (910) including an annular target surface (911) for receiving a first electron bombardment and generating X-rays.

9. The X-ray tube according to claim 8, characterized in that, The cathode base plate (420) is also provided with an exhaust filament (450) connected to the first core column (440). The exhaust filament (450) is used to emit a second electron. During the exhaust phase of the core assembly (200), the annular target surface (911) receives the second electron bombardment to release the gas in the anode target disk (910).

10. The X-ray tube according to claim 9, characterized in that, The working filament (430) and the exhaust filament (450) are arranged symmetrically about the axis (X) of the anode target disk (910).

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