Getter welding assembly for X-ray tube and X-ray tube

Abstract

The utility model discloses a getter welding assembly for an X-ray tube and the X-ray tube, the getter welding assembly comprises a connecting ring, a sealing fixing piece, a fixing rod and a getter, the outer side face of the connecting ring is used for being matched with the inner side face of a connecting pipe fitting of the X-ray tube; the fixing rod penetrates through the inner side of the connecting ring; the sealing fixing piece is fixedly installed on the inner side of the connecting ring and used for fixedly connecting the fixing rod with the connecting ring and sealing the inner side of the connecting ring. And the getter is arranged around the fixed rod and is connected with the fixed rod and the connecting ring.

Description

Technical Field

[0001] This application relates to the field of X-ray tube technology, and in particular to a degassing agent welding assembly for an X-ray tube and an X-ray tube. Background Technology

[0002] In vacuum devices, degassing agents are a key functional material that can effectively absorb gases through physical and chemical processes, maintain and improve the vacuum level, thereby ensuring stable device performance, reliable operation, and extended service life.

[0003] With the development of vacuum electronic devices, getters have gradually been classified into two categories: evaporative and non-evaporative. Evaporative getters rely on the evaporation of metals and the surface adsorption of the thin film formed after evaporation, mainly consisting of Group IIA metals (barium, strontium, magnesium, calcium) and their alloys in the periodic table. Non-evaporative getters mainly rely on surface adsorption and bulk diffusion adsorption, mainly consisting of Group IVB metals (titanium, zirconium, hafnium), thorium, rare earth metals and their alloys in the periodic table.

[0004] An X-ray tube is a high-vacuum electron tube containing two electrodes: an anode and a cathode, used to receive electron bombardment from a target and to emit electrons from a filament, respectively. Both electrodes are sealed within a high-vacuum glass or ceramic housing. The power supply of an X-ray tube includes at least a low-voltage power supply to heat the filament and a high-voltage generator to apply a high voltage to the electrodes. When a sufficient current is passed through the tungsten filament to generate an electron cloud, and a sufficient voltage (in the kilovolt range) is applied between the anode and cathode, the electron cloud is drawn towards the anode. At this point, the electrons, in a high-energy, high-speed state, collide with the tungsten target. Upon reaching the target surface, the high-speed electrons are suddenly stopped, and a small portion of their kinetic energy is converted into radiation energy, emitted as X-rays.

[0005] X-ray tubes require a high vacuum level to ensure the insulation strength inside the tube. When the vacuum level decreases, a higher voltage will be generated, resulting in a high-voltage discharge, which can damage the X-ray tube in severe cases.

[0006] To ensure the vacuum level within the X-ray tube, a getter welding structure was designed. Currently, the getter welding structure for X-ray tubes is typically installed or welded to the electron gun section, and is assembled with the electron gun assembly and tube shell as a whole, without an independent component structure. In other words, the getter welding structure must be completely adapted to the electron gun; each electron gun requires a different welding structure. Even with the same model and specification of getter, the electron gun must be redesigned. This results in a complex design for the getter-related welding structure and higher design costs.

[0007] When the getter welding structure malfunctions, replacing the getter often requires disassembling the entire electron gun component, sometimes even rendering the entire component unusable. Existing getter welding structures are immature, increasing structural instability and potentially leading to issues such as abnormal electric fields, insufficient creepage distance, stress problems, and sealing issues.

[0008] The existing X-ray tube welding process for the degassing agent welding structure is immature, resulting in complex design, difficult installation, inconvenient maintenance, and low reliability and stability. No effective solution has been proposed yet. Utility Model Content

[0009] This invention provides a getter welding assembly for X-ray tubes and an X-ray tube, which at least solves the technical problems of the immature welding manufacturing process of the getter welding structure of existing X-ray tubes, resulting in complex design, difficult installation, inconvenient maintenance, and lack of high reliability and stability.

[0010] According to one aspect of this application, a getter welding assembly for an X-ray tube is provided, comprising: a connecting ring, a sealing fastener, a fixing rod, and a getter, wherein the outer surface of the connecting ring is used to mate with the inner surface of a connecting fitting of the X-ray tube; the fixing rod is disposed through the inner surface of the connecting ring; the sealing fastener is fixedly installed on the inner surface of the connecting ring for fixing the fixing rod to the connecting ring and sealing the inner surface of the connecting ring; the getter is disposed around the fixing rod and connected to the fixing rod and the connecting ring.

[0011] Optionally, the inner side of the connecting ring is formed with a bottom wall that connects to the side wall, and the bottom wall is formed with a first through hole, wherein the fixing rod passes through the first through hole; and the sealing fastener is fixedly installed on the bottom wall to fix the fixing rod to the bottom wall and seal the gap between the first through hole and the fixing rod.

[0012] Optionally, the sealing fastener includes a ceramic liner ring, a welding piece, and a ceramic ring, wherein a first side of the ceramic liner ring is connected to the bottom wall, and a second through hole of the ceramic liner ring is connected to a first through hole of the bottom wall; a first side of the welding piece is connected to a second side of the ceramic liner ring, and a third through hole of the welding piece is connected to a second through hole; a ceramic ring is connected to a second side of the welding piece, and a fourth through hole of the ceramic ring is connected to a third through hole; and a fixing rod passes through the first through hole, the second through hole, the third through hole, and the fourth through hole, and is sealed and fixed with the welding piece.

[0013] Optionally, the bottom wall of the connecting ring is formed with a welding ring, a first through hole is formed in the welding ring, and the sealing and fixing component includes: a welding post, a ceramic post, and a sealing plate, wherein a first end of the welding post is connected to the welding ring, and a fifth through hole of the welding post communicates with the first through hole; the ceramic post is connected to a second end of the welding post, and a sixth through hole of the ceramic post communicates with the fifth through hole; a fixing rod is disposed through the first through hole, the fifth through hole, and the sixth through hole; and the sealing plate is disposed around the fixing rod and fits against the ceramic post to seal the gap between the fixing rod and the ceramic post.

[0014] Optionally, the degassing agent is connected to the fixing rod via a first lead and to the bottom wall of the connecting ring via a second lead.

[0015] Optionally, the second lead is a bent lead.

[0016] Optionally, the second lead is a straight lead of a predetermined length.

[0017] Optionally, a baffle is installed at the bottom of the fixing rod.

[0018] According to another aspect of this application, an X-ray tube is provided, wherein a connecting pipe for connecting a getter welding assembly is provided on the shell of the X-ray tube, and the getter welding assembly is provided inside the connecting pipe, wherein the outer side of the connecting ring of the getter welding assembly cooperates with the inner side of the connecting pipe, so that the getter of the getter welding assembly is inserted into the connecting pipe.

[0019] Optionally, the inner wall of the connecting pipe fitting is provided with a stepped structure, and one end of the connecting ring of the degassing agent welding assembly abuts against the stepped structure; and the other end of the connecting ring is welded and sealed to the connecting pipe fitting.

[0020] This application provides a getter welding assembly for an X-ray tube. The getter welding assembly includes a connecting ring, a sealing fastener, a fixing rod, and a getter. The outer surface of the connecting ring mates with the inner surface of a connection key of the X-ray tube. The fixing rod passes through the inner surface of the connecting ring. The sealing fastener is fixedly installed on the inner surface of the connecting ring, used to securely connect the fixing rod to the connecting ring, and to seal the inner surface of the connecting ring. The getter surrounds the fixing rod and is connected to the fixing rod and the connecting ring.

[0021] This achieves the technical benefits of facilitating the installation of the degassing agent welding assembly onto the X-ray tube by operators, enabling easy replacement in case of damage, and increasing the reliability and stability of the degassing agent welding assembly. Furthermore, it solves the technical problems of existing X-ray tube degassing agent welding structures, which suffer from immature welding manufacturing processes, resulting in complex designs, difficult installation, inconvenient maintenance, and a lack of high reliability and stability.

[0022] The above and other objects, advantages and features of this invention will become more apparent to those skilled in the art from the following detailed description of specific embodiments of this application in conjunction with the accompanying drawings. Attached Figure Description

[0023] The following sections will describe some specific embodiments of this application in detail by way of example and not limitation, with reference to the accompanying drawings. The same reference numerals in the drawings denote the same or similar parts or components. Those skilled in the art should understand that these drawings are not necessarily drawn to scale. In the drawings:

[0024] Figure 1 This is a schematic diagram of a degassing agent welding assembly for an X-ray tube according to an embodiment of this application;

[0025] Figure 2 This is a schematic diagram of another degassing agent welding assembly for an X-ray tube according to an embodiment of this application;

[0026] Figure 3 This is a schematic diagram showing the connection relationship between the degassing agent welding assembly and the X-ray tube according to the embodiments of this application. Detailed Implementation

[0027] It should be noted that, where there is no conflict, the embodiments and features in the embodiments of this utility model can be combined with each other. The present utility model will now be described in detail with reference to the accompanying drawings and embodiments.

[0028] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0029] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such terms can be used interchangeably where appropriate for the embodiments of the utility model described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0030] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0031] Figure 1 This is a schematic diagram of a degassing agent welding assembly for an X-ray tube according to an embodiment of this application. (Reference) Figure 1 As shown, this application provides a degassing agent welding assembly 100 for an X-ray tube, including: a connecting ring 110, a sealing fastener 120, a fixing rod 130, and a degassing agent 140. The outer surface of the connecting ring 110 is used to mate with the inner surface of the connecting tube of the X-ray tube; the fixing rod 130 is disposed through the inner side of the connecting ring 110; the sealing fastener 120 is fixedly installed on the inner side of the connecting ring 110 to fix the fixing rod 130 to the connecting ring 110 and to seal the inner side of the connecting ring 110; the degassing agent 140 is disposed around the fixing rod 130 and connected to the fixing rod 130 and the connecting ring 110.

[0032] As described in the background section, X-ray tubes require a high vacuum to ensure the insulation strength within the tube. When the vacuum decreases, a higher voltage can cause a high-voltage discharge, which can severely damage the X-ray tube. Currently, the getter welding structure for X-ray tubes is typically installed or welded to the electron gun assembly, and is sealed and assembled with the tube shell as a whole, without an independent component structure. In other words, the getter welding structure must be completely adapted to the electron gun; each electron gun requires a different welding structure. Even with the same model and specification of getter, the electron gun must be redesigned. This results in a complex design for the getter-related welding structure and higher design costs.

[0033] In view of this, this application provides a getter welding assembly for an X-ray tube. The getter welding assembly includes a connecting ring 110, a sealing fastener 120, a fixing rod 130, and an getter 140. The outer surface of the connecting ring 110 mates with the inner surface of the X-ray tube's connecting fitting, ensuring that the getter welding assembly can be installed into the X-ray tube's connecting fitting, thereby ensuring the normal operation of the getter welding assembly. The fixing rod 130 passes through the inner side of the connecting ring 110. The sealing fastener 120 is fixedly installed on the inner side of the connecting ring 110, used to fix the fixing rod 130 to the connecting ring 110, and to seal the inner side of the connecting ring 110, thereby ensuring the airtightness of the inside of the getter welding assembly. The degassing agent 140 is arranged around the fixing rod 130 and connected to the fixing rod 130 and the connecting ring 110, so that the degassing agent 140 can effectively absorb the active gas inside the X-ray tube and the degassing agent welding assembly, thereby ensuring the normal operation of the X-ray tube.

[0034] In addition, after the degassing agent welding assembly has been welded according to the above steps, an airtightness test is performed on the degassing agent welding assembly to ensure that the airtightness of the degassing agent welding assembly is in good condition.

[0035] This achieves the technical benefits of facilitating the installation of the degassing agent welding assembly onto the X-ray tube by operators, enabling easy replacement in case of damage, and increasing the reliability and stability of the degassing agent welding assembly. Furthermore, it solves the technical problems of existing X-ray tube degassing agent welding structures, which suffer from immature welding manufacturing processes, resulting in complex designs, difficult installation, inconvenient maintenance, and a lack of high reliability and stability.

[0036] Optionally, the inner side of the connecting ring 110 is formed with a bottom wall that connects to the side wall, and the bottom wall is formed with a first through hole 111, wherein the fixing rod 130 is disposed through the first through hole 111; and the sealing fastener 120 is fixedly installed on the bottom wall for fixing the fixing rod 130 to the bottom wall and sealing the gap between the first through hole 111 and the fixing rod 130.

[0037] Specifically, refer to Figure 1 As shown, a bottom wall is formed on the inner side of the connecting ring 110, and a first through hole 111 is formed in the bottom wall. Thus, the fixing rod 130 can pass through the first through hole 111 and ultimately connect with the degassing agent 140. Furthermore, a sealing fastener 120 is fixedly installed on the inner bottom wall of the connecting ring 110, and the sealing fastener 120 can fix the fixing rod 130 to the bottom wall of the connecting ring 110.

[0038] Thus, when the sealing fastener 120 fixes the fixing rod 130 to the bottom wall of the connecting rod 110, the sealing fastener 120 can seal the gap formed when the fixing rod 130 passes through the first through hole 111, and further ensure the airtightness of the degassing agent welding assembly.

[0039] Optionally, the sealing fastener includes a ceramic liner ring 121, a welding piece 122, and a ceramic ring 123. The first side of the ceramic liner ring 121 is connected to the bottom wall, and the second through hole 121a of the ceramic liner ring 121 communicates with the first through hole 111 of the bottom wall. The first side of the welding piece 122 is connected to the second side of the ceramic liner ring 121, and the third through hole 122a of the welding piece 122 communicates with the second through hole 121a. The ceramic ring 123 is connected to the second side of the welding piece 122, and the fourth through hole 123a of the ceramic ring 123 communicates with the third through hole 122a. A fixing rod 130 passes through the first through hole 111, the second through hole 121a, the third through hole 122a, and the fourth through hole 123a, and is sealed and fixed to the welding piece 122.

[0040] Specifically, refer to Figure 1 As shown, the sealing fastener includes a ceramic liner ring 121, a welded piece 122, and a ceramic ring 123. The first side of the ceramic liner ring 121 is connected to the bottom wall, and the second through hole 121a of the ceramic liner ring 121 and the first through hole 111 of the bottom wall are formed on a vertical line and communicate with each other. Furthermore, refer to... Figure 1 As shown, the first side of the welding piece 122 is connected to the second side of the ceramic lining ring 121, and the third through hole 122a of the welding piece 122 and the second through hole 121a are formed on a vertical line and are interconnected. Further, refer to... Figure 1 As shown, the ceramic ring 123 is connected to the second side of the welding piece 122, and the fourth through hole 123a and the third through hole 122a of the ceramic ring 123 are formed on a vertical line and are connected to each other.

[0041] Thus, the fixing rod 130 can be connected to the clearing agent 140 through the fourth through hole 123a, the third through hole 122a, the second through hole 121a, and the first through hole 111. This ensures that the clearing agent 140 can effectively absorb the active gas inside the X-ray tube and ensure the normal operation of the X-ray tube.

[0042] Optionally, the bottom wall of the connecting ring 110 is formed with a welding ring 112, a first through hole 111 is formed in the welding ring 112, and the sealing fastener 120 includes: a welding post 124, a ceramic post 125, and a sealing piece 126, wherein the first end of the welding post 124 is connected to the welding ring 112, and the fifth through hole 124a of the welding post 124 communicates with the first through hole 111; the ceramic post 125 is connected to the second end of the welding post 124, and the sixth through hole 125a of the ceramic post 125 communicates with the fifth through hole 124a; the fixing rod 130 is disposed through the first through hole 111, the fifth through hole 124a, and the sixth through hole 125a; and the sealing piece 126 is disposed around the fixing rod 130 and fits against the ceramic post 125 to seal the gap between the fixing rod 130 and the ceramic post 125.

[0043] Specifically, Figure 2 This is a schematic diagram of another degassing agent welding assembly for an X-ray tube according to an embodiment of this application. (Reference) Figure 2 As shown, the sealing fastener 120 includes a welded post 124, a ceramic post 125, and an encapsulating plate 126. The first end of the welded post 124 is connected to the welded ring 112, and the fifth through hole 124a of the welded post 124 communicates with the first through hole 111. Further, refer to... Figure 2 As shown, the ceramic column 125 is connected to the second end of the welded column 124, and the sixth through hole 125a of the ceramic column 125 is connected to the fifth through hole 124a. The fixing rod 130 passes through the fifth through hole 124a, the sixth through hole 125a, and the first through hole 111. When the welded column 124 is welded to the ceramic column 125, the fixing rod 130 can be fixed within the ceramic seal 120 and connected to the degassing agent 140.

[0044] In addition, since there will be a certain gap between the fixing rod 130 and the ceramic post 125 when the fixing rod 130 passes through it, it is necessary to surround the fixing rod 130 and fit it with the ceramic post 125 so as to seal the gap between the fixing rod 130 and the ceramic post 125 using the sealing plate 126.

[0045] Optionally, the degassing agent 140 is connected to the fixing rod 130 via the first lead 151 and to the bottom wall of the connecting ring 110 via the second lead 152.

[0046] Specifically, refer to Figure 1 and Figure 2 As shown, the degassing agent 140 and the first lead 151 are connected by methods including, but not limited to, resistance welding and laser welding to ensure the connection strength of the weld joint. The first lead 151 and the fixing rod 130 are welded by brazing, and an airtightness test is performed after welding to ensure that the component has good sealing performance.

[0047] In addition, the degassing agent 140 and the second lead 152 are connected by methods including, but not limited to, resistance welding and laser welding to ensure the connection strength of the weld joint. The second lead 152 and the connecting ring 110 are brazed, and an airtightness test is performed after welding to ensure that the component has good sealing performance.

[0048] Preferably, the second lead 152 is a bent lead.

[0049] More preferably, the second lead 152 is a straight lead of a predetermined length.

[0050] Optionally, a baffle 160 is installed at the bottom of the fixing rod 130. The baffle 160 is welded to the fixing rod 130, and the welding method includes, but is not limited to, laser welding, argon arc welding, etc. The baffle 160 can effectively prevent the degassing agent 140 from falling and entering the cavity of the X-ray tube.

[0051] According to another aspect of this application, an X-ray tube 200 is provided, wherein a connecting pipe 210 for connecting a getter welding assembly 100 is provided on the shell of the X-ray tube, and the getter welding assembly 100 is provided inside the connecting pipe 210, wherein the outer side of the connecting ring 110 of the getter welding assembly 100 cooperates with the inner side of the connecting pipe 210, so that the getter 140 of the getter welding assembly 100 is inserted into the connecting pipe 210.

[0052] Specifically, since existing getter welding components are usually installed or welded to the electron gun part and are assembled with the electron gun component and the tube shell, there is no independent component structure. The electron gun and the welding structure correspond one-to-one, which makes the design of the getter-related welding structure more complicated and has higher design costs.

[0053] To address the aforementioned issues, this application provides the following: Figure 1 The shown is the getter welding assembly 100. And... Figure 3 This is a schematic diagram showing the connection relationship between the getter welding assembly and the X-ray tube according to an embodiment of this application. (Reference) Figure 3 As shown, the X-ray tube housing is provided with a connecting fitting 210 for connecting the getter welding assembly 100, and the getter welding assembly 100 is installed inside the connecting fitting 210. The outer side of the connecting ring 110 of the getter welding assembly 100 is welded to the inner side of the connecting fitting 210. This securely connects the getter welding assembly 100 to the connecting fitting 210. The connecting fitting 210 is positioned on the metal shell of the X-ray tube near the electron gun, without affecting the internal space or electric field.

[0054] This achieves the technical effect of improving the versatility of the degassing agent welding assembly and facilitating timely replacement of the degassing agent welding assembly in case of failure.

[0055] Optionally, the inner wall of the connecting pipe fitting 210 is provided with a stepped structure 211, and one end of the connecting ring 110 of the degassing agent welding assembly abuts against the stepped structure 211; and the other end of the connecting ring 110 is welded and sealed to the connecting pipe fitting 210.

[0056] Specifically, refer to Figure 3 As shown, the inner wall of the connecting pipe fitting 210 is provided with a stepped structure 211. One end of the connecting ring 110 of the degassing agent welding assembly abuts against the stepped structure 211, thereby achieving internal step positioning. The other end of the connecting ring 110 is welded and sealed to the connecting pipe fitting 210. The welding method includes, but is not limited to, argon arc welding, laser welding, and other welding methods.

[0057] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0058] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0059] In the description of this utility model, it should be understood that the directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this utility model. The directional terms "inner" and "outer" refer to the inner and outer contours of each component itself.

[0060] The above description is merely a preferred embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A getter welding assembly (100) for an X-ray tube, characterized in that, The utility model relates to a sealing structure of X-ray tube, including: Connecting ring (110), sealing fixing part (120), fixed rod (130) and gas remover (140), wherein The outer side of connecting ring (110) is used for cooperating with the inner side of the connecting pipe fitting of X-ray tube; The fixed rod (130) is arranged through the inner side of connecting ring (110); Sealing fixing part (120) is fixedly installed on the inner side of connecting ring (110), is used for fixing the fixed rod (130) with connecting ring (110) and seals the inner side of connecting ring (110); Gas remover (140) is arranged around fixed rod (130) and is connected with fixed rod (130) and connecting ring (110).

2. The gas getter welding assembly of claim 1, wherein, The inner side of connecting ring (110) is formed with bottom wall connected with side wall, and the bottom wall is formed with first through hole (111), and wherein The fixed rod (130) is arranged through first through hole (111); And sealing fixing part (120) is fixedly installed on the bottom wall, is used for fixing the fixed rod (130) with the bottom wall, and seals the gap between first through hole (111) and fixed rod (130).

3. The gas getter welding assembly of claim 2, wherein, The sealing fixing part includes porcelain lining ring (121), welding sheet (122) and ceramic ring (123), wherein The first side of porcelain lining ring (121) is connected with the bottom wall, and the second through hole (121a) of porcelain lining ring (121) is communicated with the first through hole (111) of the bottom wall; The first side of welding sheet (122) is connected with the second side of porcelain lining ring (121), and the third through hole (122a) of welding sheet (122) is communicated with the second through hole (121a); The ceramic ring (123) is connected with the second side of the welding sheet (122), and the fourth through hole (123a) of the ceramic ring (123) is communicated with the third through hole (122a); And The fixed rod (130) passes through the first through hole (111), the second through hole (121a), the third through hole (122a) and the fourth through hole (123a), and is sealed with the welding sheet (122).

4. The gas getter welding assembly of claim 2, wherein, The bottom wall of connecting ring (110) is formed with welding ring (112), the first through hole (111) is formed in the welding ring (112), and the sealing fixing part (120) includes: welding column (124), ceramic column (125) and sealing sheet (126), wherein The first end of welding column (124) is connected with welding ring (112), and the fifth through hole (124a) of welding column (124) is communicated with first through hole (111); The ceramic column (125) is connected with the second end of the welding column (124), and the sixth through hole (125a) of the ceramic column (125) is communicated with the fifth through hole (124a); The sixth through hole (125a) of the ceramic column (125) is communicated with the fifth through hole (124a). The fixing rod (130) is arranged through the first through hole (111), the fifth through hole (124a) and the sixth through hole (125a); and The sealing piece (126) is arranged around the fixing rod (130) and is attached to the ceramic column (125) for sealing the gap between the fixing rod (130) and the ceramic column (125).

5. The gas getter welding assembly of claim 1, wherein, The getter (140) is connected to the fixing rod (130) through a first lead wire (151) and is connected to the bottom wall of the connecting ring (110) through a second lead wire (152).

6. The gas getter welding assembly of claim 5, wherein, The second lead wire (152) is a bent lead wire.

7. The gas getter welding assembly of claim 5, wherein, The second lead wire (152) is a straight lead wire with a predetermined length.

8. The gas getter welding assembly of claim 1, wherein, A baffle (160) is mounted at the bottom of the fixing rod (130).

9. An X-ray tube (200), characterized by A connecting pipe fitting (210) for connecting the getter welding assembly (100) is arranged on the shell of the X-ray tube, and the getter welding assembly (100) according to any one of claims 1-8 is arranged in the connecting pipe fitting (210), wherein the outer side surface of the connecting ring (110) of the getter welding assembly (100) cooperates with the inner side surface of the connecting pipe fitting (210), so that the getter (140) of the getter welding assembly (100) is inserted into the connecting pipe fitting (210).

10. The x-ray tube of claim 9, wherein, The inner wall of the connecting pipe fitting (210) is provided with a step structure (211), and wherein One end of the connecting ring (110) of the getter welding assembly abuts against the step structure (211); and The other end of the connecting ring (110) is welded and sealed with the connecting pipe fitting (210).

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