JP2018060623A - Rotary anode structure and rotary anode x-ray tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary anode structure and a rotary anode x-ray tube.SOLUTION: A rotary anode structure comprises: an anode target; a cylindrical anode target support body supporting the anode target; a cylindrical driving rotor in which one end part of the anode target support body is inserted into an inner periphery; and a whirl-stop member. The driving rotor includes a flange part projected toward the inner periphery. In the flange part, an engagement hole of the whirl-stop member is formed. In a surface of the inner periphery of the driving rotor, a female screw is formed in an insertion side of the anode target support body. A male screw is formed in an external periphery of one end part of the anode target. The female and male screws are fitted, and the whirl-stop member is contacted to one end part of the anode target support body through the engagement hole of the flange part.SELECTED DRAWING: Figure 1

Description

  Embodiments described herein relate generally to a rotary anode structure and a rotary anode X-ray tube.

  In general, a rotating anode X-ray tube is known in which an electron beam emitted from a cathode provided opposite to a rotating umbrella-shaped anode target collides to generate X-rays. In such a rotary anode X-ray tube, the rotary anode structure includes an anode target, an anode target support that supports the anode target, and a drive rotor that is fixed to the anode target support and receives a rotational driving force from the outside. Yes.

Special table 2003-536225 gazette

  In the rotating anode structure, it is required that the anode target support and the driving rotor be firmly connected. In particular, since the anode target support member and the drive rotor are in a high-temperature environment, the strength of the connection portion may be reduced due to the influence of the heat.

  Embodiments of the present invention provide a rotary anode structure having a simple configuration and a high strength of a connecting portion, and a rotary anode X-ray tube using the rotary anode structure.

  A rotating anode structure according to an embodiment includes an anode target, a cylindrical anode target support that supports the anode target, and a cylindrical drive rotor in which one end of the anode target support is inserted into an inner periphery. An anti-rotation member, and the drive rotor has a flange portion projecting toward an inner periphery, and an engagement hole for the anti-rotation member is formed in the flange portion, and the drive rotor A female screw is formed on the inner peripheral surface of the anode target supporter on the insertion side of the anode target support with respect to the flange portion, and a male screw is formed on the outer periphery of the one end portion of the anode target. A male screw is screwed together and the detent member is in contact with the one end portion of the anode target support through the engagement hole of the flange portion.

FIG. 1 is a longitudinal sectional view showing a schematic configuration of a rotary anode X-ray tube according to a first embodiment. FIG. 2 is a cross-sectional view showing the rotating anode structure shown in FIG. FIG. 3 is an enlarged view of a portion A shown in FIG. FIG. 4 is an exploded perspective sectional view of the rotating anode structure shown in FIG. FIG. 5 is a perspective view showing the appearance of the rotating anode structure shown in FIG. FIG. 6 is an exploded perspective view of the rotating anode structure shown in FIG. FIG. 7 is a diagram showing the second embodiment, and is an enlarged view of a portion corresponding to FIG.

  Hereinafter, a rotary anode X-ray tube apparatus according to an embodiment will be described in detail with reference to the drawings. In addition, although the drawings may be schematically represented with respect to the width, thickness, shape, and the like of each part as compared with the actual mode for clarity of explanation, they are merely examples, and The interpretation is not limited. In addition, in the present specification and each drawing, components that perform the same or similar functions as those described above with reference to the previous drawings are denoted by the same reference numerals, and repeated detailed description may be omitted as appropriate. .

(First embodiment)
First, the rotating anode X-ray tube 1 according to the first embodiment will be described with reference to FIGS.

  As shown in FIG. 1, the rotary anode X-ray tube 1 includes a vacuum envelope 3, a rotary anode structure 5 housed in the vacuum envelope 3, a shaft 7, a cathode 9, and a vacuum envelope. 3 and a stator coil 11 provided on the outer side.

  The inside of the vacuum envelope 3 is kept in a vacuum.

  The rotating anode structure 5 includes an anode target 12, an anode target support 13, a drive rotor 15, and a rotation preventing member 17.

  The anode target 12 has an umbrella shape, and an anode target layer 12a is formed on the outer surface thereof. The anode target layer 12a is omitted in FIGS. The anode target 12 is made of a refractory metal, for example, molybdenum, tungsten, or an alloy thereof. The anode target layer 12a is also made of a refractory metal, and for example, tungsten, molybdenum, or each of these alloys is used.

  The anode target support 13 has a bottomed cylindrical shape, and the anode target 12 is fixed to the bottom portion 13a side. A hole (shown by a broken line in FIG. 1) is formed in the central portion of the anode target 12, and the anode target support 13 is inserted into the hole and the anode target 12 is fixed by brazing.

  One end portion of the cylindrical anode target support 13 is inserted into the inner peripheral side of the drive rotor 15, and a first flange portion 19 protruding from the outer peripheral side is formed at the insertion end portion (one end portion). Has been. A male screw 21 (see FIG. 4) is formed on the outer peripheral surface of the first flange portion 19 along the circumferential direction.

  A concave portion 27 that receives the tip of the detent member 17 is formed on the end surface of the first flange portion 19 on the drive rotor 15 side. The recesses 27 are provided at intervals in the circumferential direction corresponding to the number of rotation preventing members 17 described later, and, for example, eight recesses 27 are formed in the first embodiment. The recess 27 may have any shape and size that receives the tip of the anti-rotation member 17, and the depth may be any size that receives the anti-rotation member 17, and is deep enough to catch the tip of the anti-rotation member 17. I just need it.

  The drive rotor 15 has a substantially cylindrical shape and has a two-layer structure of an outer layer portion 15a and an inner layer portion 15b. The outer layer portion 15a is made of copper or an alloy thereof, and the inner layer portion 15b is made of an iron-based metal such as pure iron. The inner layer portion 15b is formed with a second flange portion 23 protruding from the inner peripheral side.

  In the inner layer portion 15b, on the anode target 12 side of the second flange portion 23, a female screw 25 (see FIG. 4) to which the male screw 21 of the first flange portion 19 is screwed is formed.

  Engagement holes 29 are formed in the second flange portion 23 at predetermined intervals along the circumferential direction. The engagement hole 29 is a hole in which the rotation preventing member 17 is engaged from the side opposite to the anode target support 13. The distal end of the rotation prevention member 17 engaged with the engagement hole 29 comes into contact with the bottom surface of the concave portion 27 of the first flange portion 19. In the present embodiment, the engagement hole 29 is a female screw hole, and the rotation preventing member 17 is a screw or a bolt.

  The cathode 9 is attached toward the inside of the vacuum envelope 3 and includes a filament 31 as an electron emission source that emits electrons.

  As shown in FIG. 1, the shaft 7 is disposed inside the anode target support 13 and the drive rotor 15, and rotatably supports the rotary anode structure 5 composed of these.

  Next, the assembly of the rotary anode structure 5 and the rotary anode X-ray tube according to the first embodiment will be described.

  As shown in FIGS. 4 and 6, the rotating anode structure 5 is assembled by first fitting the anode target support 13 into the central hole of the umbrella-shaped anode target 12 and fixing it by brazing. On the other hand, the external thread 21 is formed on the outer peripheral surface of the first flange portion 19 on the anode target support 13.

  In the drive rotor 15, a female screw 25 is formed in the cylindrical inner layer portion 15 b so that the male screw 21 of the first flange portion 19 is engaged with the anode side portion of the second flange portion 23. Further, in the second flange portion 23, a female screw 28 (see FIG. 3) is formed in the engagement hole 29 with a predetermined interval in the circumferential direction.

  Thereafter, the male screw 21 (see FIG. 4) of the first flange portion 19 of the anode target support 13 is screwed into the female screw 25 formed on the inner layer portion 15b of the drive rotor 15, and the anode target support 13 and the drive rotor 15 are connected. Next, in the second flange portion 23 of the drive rotor 15, the anti-rotation member 17 is screwed into the engagement hole 29 from the side opposite to the anode target support 13, and the tip of the anti-rotation member 17 is connected to the first flange portion 19. It is made to contact the bottom of the recess 27.

  A shaft 7 is provided inside the rotary anode assembly 5 assembled in this way, and the rotary anode assembly 5 is attached to the vacuum envelope 3 together with the shaft 7. A cathode 9 is attached to the vacuum envelope 3. A stator coil 11 is provided outside the vacuum envelope 3 to assemble the rotary anode X-ray tube 1.

  In the rotating anode X-ray tube 1, when the stator coil 11 is energized, the outer layer portion 15 a of the driving rotor 15 is rotated by the electromagnetic force, and electrons emitted from the cathode 9 collide with the anode target layer 12 a, And X-rays are emitted to the outside of the vacuum envelope 3.

  According to the present embodiment, the rotating anode structure 5 includes a large-diameter male screw 21 formed on the outer periphery of the anode target support 13 and a large-diameter female screw formed on the inner peripheral side of the drive rotor 15 that is screwed to the male screw 21. Since the anode target support 13 and the drive rotor 15 are connected by screwing with the screw 25, the connecting portion is high in strength because the large diameter screws 21 and 25 are screwed together.

  In addition, since the large-diameter male screw 23 is formed on the outer peripheral surface of the anode target support 13 and the large-diameter female screw 25 is screwed together on the inner peripheral surface of the drive rotor 15, the screw is formed. easy. In particular, in the case where the anode target support 13 is made of a hard material such as molybdenum, it is difficult to form a small-diameter female screw hole, but since the male screw is formed on the outer peripheral surface, it is easy to form a screw.

  Since the drive rotor 15 is provided with a rotation preventing member 17 with respect to the anode target support 13, the large-diameter male screw 21 formed on the outer peripheral surface of the first flange portion 19 of the anode target support 13 and the drive rotor are provided. In addition to the fastening force with the large-diameter female screw 25 formed on the inner peripheral surface 15, the first flange portion 19 of the anode target support 13 is applied with the anti-rotation member 17 contacting the end surface to generate tension. Therefore, the anode target support 13 and the drive rotor 15 can be firmly fastened.

  According to the rotary anode X-ray tube 1 using the rotary anode structure 5 according to the present embodiment, it is possible to maintain a stable rotation without the drive rotor 15 and the anode target support 13 being separated or displaced. it can. Therefore, stable X-rays can be generated from the rotary anode X-ray tube 1.

  Other embodiments will be described below. In the embodiments described below, the same reference numerals are given to the portions having the same functions and effects as those of the above-described embodiment, and the detailed description of the portions will be given. In the following description, differences from the embodiment will be mainly described.

(Second Embodiment)
FIG. 7 shows a connecting portion between the anode target support 13 and the drive rotor 15 of the rotary anode structure 5 according to the second embodiment. The second embodiment is different from the first embodiment in that the anti-rotation member 17 is welded to the inner peripheral surface of the drive rotor 15 by a welding portion 35.

  According to this 2nd Embodiment, there can exist an effect similar to 1st Embodiment mentioned above.

  Furthermore, according to the second embodiment, since the anti-rotation member 17 is fixed by welding, the anti-rotation member 17 can be reliably prevented from coming off, and the anode target support 13 and the drive rotor 15 can be further strengthened. Can be fixed.

  The above-described embodiment has been presented as an example, and is not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

  For example, in the first embodiment, the anti-rotation member 17 is not limited to forming a screw in the engagement hole 29 formed in the second flange portion 23 and fixing the screw by press fitting or the like. Alternatively, it may be welded after being press-fitted and fixed to the second flange portion 23.

  The number of the anti-rotation member 17 and the engagement hole 29 into which the anti-rotation member 17 is fitted is not limited to eight, but may be six or four, and the number is not limited.

  DESCRIPTION OF SYMBOLS 1 ... Rotating anode X-ray tube, 5 ... Rotating anode structure, 12 ... Anode target, 13 ... Anode target support body, 15 ... Drive rotor, 17 ... Detent member, 23 ... 2nd flange part (flange part), 21 ... Male screw, 25 ... female screw, 27 ... concave portion, 29 ... engagement hole.

Claims (6)

An anode target;
A cylindrical anode target support for supporting the anode target;
A cylindrical drive rotor in which one end of the anode target support is inserted into the inner periphery;
A detent member,
The drive rotor has a flange portion projecting toward the inner periphery, and the flange portion is formed with an engagement hole of the rotation preventing member, and the flange portion is formed on an inner peripheral surface of the drive rotor. A female screw is formed on the insertion side of the anode target supporter, a male screw is formed on the outer periphery of the one end of the anode target, and the female screw and the male screw are screwed together. A rotating anode structure in which the anti-rotation member is in contact with the one end portion of the anode target support through the engagement hole of the flange portion.   2. The rotating anode assembly according to claim 1, wherein a female screw is formed in the engagement hole formed in the flange portion, and the rotation preventing member is a screw or a bolt that is screwed into the female screw of the engagement hole. .   The rotating anode structure according to claim 1, wherein the rotation preventing member is welded to an inner peripheral surface of the flange portion and the drive rotor.   The rotary anode structure according to any one of claims 1 to 3, wherein a recess is formed in a contact surface with the anti-rotation member at the one end portion of the anode target support.   The rotary anode structure according to any one of claims 1 to 4, wherein the anode target support is molybdenum or a molybdenum alloy.   The anode structure according to any one of claims 1 to 4, a cathode provided to face the anode target, an envelope containing the anode structure and the cathode, and an outside of the envelope A rotary anode X-ray tube comprising a stator coil disposed opposite to the outer peripheral surface of the drive rotor.

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