Cathode fixing device for an x-ray tube and x-ray tube

Abstract

This invention provides a cathode fixing device for an X-ray tube, comprising a first clamping block and a second clamping block disposed opposite to each other on both sides of a protective sleeve. The first clamping block includes a positioning part pointing towards the protective sleeve, and a positioning groove is formed on the positioning part. A contact strip protrudes from the inner surface of the positioning groove. The extending direction of the positioning groove and the contact strip is parallel to the axial direction of the support rod. Two contact strips are spaced apart. This cathode fixing device uses multiple contact strips to perform multi-point positioning of the protective sleeve, effectively improving the positioning effect. Furthermore, the gaps between the contact strips provide uniform displacement space for thermal expansion, preventing lateral displacement due to thermal expansion. This reduces support rod misalignment caused by thermal expansion, improves the positioning reliability of the support rod, and consequently improves the positioning reliability of the filament fixed to the support rod, thus improving the quality of the X-ray tube.

Description

Technical Field

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

[0002] The X-ray tube uses electrons released by the cathode filament at high temperature to bombard the anode target, exciting the anode to emit X-rays. A guiding electric field is provided between the cathode and the anode to ensure that the electrons released by the filament can accurately bombard the anode focus, thus ensuring the quality of the emitted X-rays.

[0003] To ensure that the electrons released from the cathode can accurately bombard the anode focus, the filament needs to be aligned with the anode focus. In the prior art, to facilitate the installation of the cathode filament, the filament is usually fixed to a support rod. By ensuring the fixed posture of the support rod, the alignment effect between the filament and the anode can be ensured.

[0004] In existing technologies, the support rod is typically fixed by clamping it with two clamping blocks. To ensure clamping reliability, the clamping blocks are usually rigid metal parts. To prevent damage to the support rod from the rigid clamping blocks, a protective sleeve is installed on the outside of the support rod, and the clamping blocks are clamped outside the protective sleeve. However, with the clamping blocks clamping and fixing it on both sides, there are two points of contact with the support rod. When thermal expansion occurs, the support rod is prone to tilting, causing the filament position to shift and affecting the quality of the X-ray tube. Utility Model Content

[0005] Based on this, the purpose of this utility model is to provide a cathode fixing device and an X-ray tube to solve the problem that the support rod for fixing the filament is prone to deflection during thermal expansion, which affects the quality of the X-ray tube.

[0006] This utility model provides a cathode fixing device for an X-ray tube. The cathode module of the X-ray tube includes a support rod that passes through the focusing electrode, and a filament is fixed on the support rod. A protective sleeve is provided over the support rod. The cathode fixing device includes a first clamping block and a second clamping block that are disposed opposite to each other on both sides of the protective sleeve. The first clamping block includes a positioning part that points towards the protective sleeve. A positioning groove is formed on the positioning part. A contact strip is protruding from the inner surface of the positioning groove. The extending directions of the positioning groove and the contact strip are parallel to the axial direction of the support rod. Two contact strips are provided at intervals.

[0007] Optionally, the structure of the second clamping block is the same as that of the first clamping block.

[0008] Optionally, the cross-section of the contact strip is a convex arc shape.

[0009] Optionally, the four contact strips are evenly arranged around the support rod.

[0010] Optionally, the first clamping block is further provided with a limiting part, which protrudes and points toward the second clamping block.

[0011] Optionally, the first clamping block and the second clamping block are also provided with transversely through pin holes, and the first clamping block and the second clamping block are aligned by positioning pins provided in the pin holes.

[0012] Another aspect of this invention provides an X-ray tube, including the cathode fixing device for the X-ray tube described above.

[0013] The cathode fixing device for an X-ray tube provided by this utility model includes a first clamping block and a second clamping block disposed opposite to each other on both sides of a protective sleeve. The first clamping block includes a positioning part pointing towards the protective sleeve, and a positioning groove is formed on the positioning part. A contact strip protrudes from the inner surface of the positioning groove. The extending direction of the positioning groove and the contact strip is parallel to the axial direction of the support rod. Two contact strips are spaced apart. This cathode fixing device uses multiple contact strips to perform multi-point positioning of the protective sleeve, which can effectively improve the positioning effect. Furthermore, the gaps between the contact strips provide uniform displacement space for thermal expansion, preventing the support rod from shifting to one side due to thermal expansion. This reduces support rod misalignment caused by thermal expansion, improves the positioning reliability of the support rod, and consequently improves the positioning reliability of the filament fixed to the support rod, thus improving the quality of the X-ray tube. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural diagram of the cathode module of the X-ray tube in an embodiment of this utility model; Figure 2 This is a side view of the cathode module of the X-ray tube in an embodiment of the present invention; Figure 3 This is a schematic diagram of the cathode fixing device for the X-ray tube in an embodiment of the present invention.

[0015] The following detailed description, in conjunction with the accompanying drawings, will further illustrate this utility model. Detailed Implementation

[0016] To facilitate understanding of this utility model, a more complete description will be given below with reference to the accompanying drawings. Several embodiments of this utility model are shown in the drawings. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this utility model will be more thorough and complete.

[0017] It should be noted that when a component is said to be "fixed to" another component, it can be directly on the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0018] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0019] To address the problem of filament-fixing rods easily becoming misaligned during thermal expansion, affecting the quality of X-ray tubes, this invention provides a cathode fixing device for X-ray tubes. The device includes a first clamping block and a second clamping block positioned opposite each other on either side of a protective sleeve. The first clamping block includes a positioning part pointing towards the protective sleeve, with a positioning groove on the positioning part. A contact strip protrudes from the inner surface of the positioning groove, and the extension direction of the positioning groove and the contact strip is parallel to the axial direction of the rod. Two contact strips are spaced apart. Multi-point positioning of the protective sleeve using multiple contact strips effectively improves the positioning effect. Furthermore, the gaps between the contact strips provide uniform displacement space for thermal expansion, preventing the rod from shifting to one side during thermal expansion. This reduces rod misalignment caused by thermal expansion, improves the positioning reliability of the rod, and consequently improves the positioning reliability of the filament fixed to the rod, ultimately enhancing the quality of the X-ray tube.

[0020] For details, please refer to Figure 1 , Figure 2 and Figure 3 In this embodiment, the cathode module of the X-ray tube includes a support rod 12 that passes through the focusing electrode 10. The filament 11 is fixed on the support rod 12. The support rod 12 is covered with a protective sleeve 13. The support rod 12 is also fixed to the focusing electrode 10 by a ceramic sleeve and is sealed to ensure the sealing requirements of the filament 11 side.

[0021] The cathode fixing device includes a first clamping block 20 and a second clamping block disposed opposite to each other on both sides of the protective sleeve 13. The first clamping block 20 includes a positioning part 21 pointing towards the protective sleeve 13. A positioning groove is provided on the positioning part 21. A contact strip 211 is provided protruding from the inner surface of the positioning groove. The extending direction of the positioning groove and the contact strip 211 is parallel to the axial direction of the support rod 12. Two contact strips 211 are provided at intervals.

[0022] When the two clamping blocks are clamped, the positioning groove of the positioning part 21 is aligned with the corresponding support rod 12 and protective sleeve 13. It contacts the protective sleeve 13 through the two contact strips 211 and clamps it. Thus, the two contact strips 211 of the first clamping block 20 and the contact surface of the second clamping block can be combined to form multi-point contact positioning, which can effectively improve the positioning effect of the support rod 12 and reduce thermal expansion displacement.

[0023] To improve the positioning effect, in this embodiment, the structure of the second clamping block is the same as that of the first clamping block 20, which can form a symmetrical structure. Thus, when the support rod 12 and the protective sleeve 13 collide thermally, they collide in all directions, and the various offsets are symmetrical, which cancels the offset effect. This ensures that the axial position of the support rod 12 and the protective sleeve 13 after thermal expansion remains in place, maintaining the original positioning posture, thereby ensuring the stability of the filament 11 and ensuring the performance of the X-ray tube.

[0024] To improve the symmetrical positioning effect, in this embodiment, the cross-section of the contact strip 211 is a convex arc shape, making point contact with the protective sleeve 13. This reduces the risk of injury from sharp objects and avoids offset caused by uneven contact surfaces, thus improving positioning accuracy. Furthermore, as the protective sleeve 13 expands, the contact surface gradually increases and expands uniformly.

[0025] To further reduce the offset effect of thermal expansion, in this embodiment, four contact strips 211 are evenly arranged around the support rod 12, so that the gap between the four contact strips 211 is evenly arranged, the reserved space size in the guiding direction of thermal expansion is the same, and the change state of the contact surface in each direction after thermal expansion is the same, which can reduce the offset caused by the difference in each direction.

[0026] In this embodiment, two support rods 12 of the cathode module are arranged side by side to supply power to the two electrodes of the filament 11. Two sets of positioning parts 21 are arranged on the clamping block (not shown in the figure). Correspondingly, a limiting part 22 is also provided on the clamping block. The limiting part 22 protrudes and points towards the second clamping block. The parallelism of the two clamping blocks can be limited by the limiting part 22 to avoid the problem that the two clamping blocks are arranged at an angle, which would cause the two sets of positioning parts 21 to fail to clamp effectively.

[0027] To further improve the reliability of the parallel alignment of the two clamping blocks, in this embodiment, the first clamping block and the second clamping block are still provided with transversely through pin holes 23, and the first clamping block and the second clamping block are aligned by positioning pins (not shown in the figure) provided in the pin holes 23.

[0028] This utility model also provides an X-ray tube, including the cathode fixing device of the above-mentioned X-ray tube, which can effectively ensure the positioning reliability of the cathode support rod 12 under thermal expansion conditions, improve the positioning reliability of the filament 11, and thus ensure the performance of the X-ray tube.

[0029] This utility model provides a cathode fixing device for an X-ray tube and an X-ray tube comprising a first clamping block and a second clamping block disposed opposite to each other on both sides of a protective sleeve. The first clamping block includes a positioning part pointing towards the protective sleeve, and a positioning groove is formed on the positioning part. A contact strip protrudes from the inner surface of the positioning groove. The extending direction of the positioning groove and the contact strip is parallel to the axial direction of the support rod. Two contact strips are spaced apart. Multi-point positioning of the protective sleeve using multiple contact strips effectively improves the positioning effect. Furthermore, the gaps between the contact strips provide uniform displacement space for thermal expansion, preventing the support rod from shifting to one side during thermal expansion. This reduces support rod misalignment caused by thermal expansion, improves the positioning reliability of the support rod, and consequently improves the positioning reliability of the filament fixed to the support rod, thus improving the quality of the X-ray tube.

[0030] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0031] The embodiments described above are merely illustrative of several specific implementations of this utility model, and while the descriptions are detailed, they should not be construed as limiting the scope of protection of this utility model. 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 modifications and improvements all fall within the scope of protection of this utility model. Therefore, the scope of protection of this utility model patent should be determined by the appended claims.

Claims

1. A cathode fixing device for an X-ray tube, characterized in that, The cathode module of the X-ray tube includes a support rod that passes through the focusing electrode, and a filament is fixed on the support rod. A protective sleeve is provided over the support rod. The cathode fixing device includes a first clamping block and a second clamping block that are disposed opposite to each other on both sides of the protective sleeve. The first clamping block includes a positioning part that points towards the protective sleeve. A positioning groove is formed on the positioning part. A contact strip is provided protruding from the inner surface of the positioning groove. The extending direction of the positioning groove and the contact strip is parallel to the axial direction of the support rod. Two contact strips are provided at intervals.

2. The cathode fixing device for an X-ray tube according to claim 1, characterized in that, The structure of the second clamping block is the same as that of the first clamping block.

3. The cathode fixing device for an X-ray tube according to claim 2, characterized in that, The contact strip has a convex arc shape in cross-section.

4. The cathode fixing device for an X-ray tube according to claim 2, characterized in that, The four contact strips are evenly arranged around the support rod.

5. The cathode fixing device for an X-ray tube according to claim 1 or 2, characterized in that, The first clamping block is also provided with a limiting part, which protrudes and points towards the second clamping block.

6. The cathode fixing device for an X-ray tube according to claim 1, characterized in that, Both the first clamping block and the second clamping block are provided with transversely penetrating pin holes, and the first clamping block and the second clamping block are aligned by positioning pins provided in the pin holes.

7. An X-ray tube, characterized in that, The cathode fixing device for the X-ray tube as described in any one of claims 1 to 6.

Images