X-ray tube and method for manufacturing an X-ray tube

Abstract

To provide an X-ray tube that is easy to assemble and a method for manufacturing an X-ray tube. [Solution] An X-ray tube in which a cathode and an anode are housed in a tube container, comprising: a cylindrical first joint provided on the anode; a cylindrical second joint provided on the tube container into which the first joint is inserted; and a fastening member attached to at least one of the inner circumference of the first joint and the outer circumference of the second joint, which applies pressure to the mating surfaces of the first joint and the second joint to fasten the first joint and the second joint together.

Claims

1. An X-ray tube in which the cathode and anode are housed in a tube container, A cylindrical first joint portion provided on the anode, A cylindrical second joint is provided in the aforementioned tubular container into which the first joint is inserted, A fastening member is attached to at least one of the inner circumference of the first joint and the outer circumference of the second joint to apply pressure to the mating surfaces of the first joint and the second joint, thereby fastening the first joint and the second joint together. An X-ray tube equipped with [a specific feature / equipment].

2. The fastening member is A first fastening member is attached to the inner circumference of the first joint and pushes the first joint outwards from the inside, applying the pressure to the mating surface, A second fastening member is attached to the outer circumference of the second joint and tightens the second joint from the outside, applying the pressure to the mating surface, Composed of, The X-ray tube according to claim 1.

3. The thermal expansion coefficient of the first fastening member is α 1 The thermal expansion coefficient of the second fastening member is α 2 In that case, α 2 <α 1 Satisfying the relationship, The X-ray tube according to claim 2.

4. Let the outer diameter of the first fastening member be D o1 and the inner diameter of the second fastening member be D i2 and the inner diameter of the second joint be D iB Let the coefficient of thermal expansion of the first fastening member be α 1 and the coefficient of thermal expansion of the second fastening member be α 2 and the coefficient of thermal expansion of the first joint be α A and the coefficient of thermal expansion of the second joint be α B Let the temperature change of the first fastening member be ΔT 1 and the temperature change of the second fastening member be ΔT 2 and the temperature change of the first joint be ΔT A and the temperature change of the second joint be ΔT B When this is the case, a 2 DT 2 D i2 <a 1 DT 1 D o1 +a B DT B (D) i2 -D iB )+a A DT A (D) iB -D o1 ) Satisfying the relationship, The X-ray tube according to claim 2.

5. The first fastening member has an outer diameter larger than the inner diameter of the first joint under normal temperature conditions, and shrinks upon cooling to an outer diameter that can be fitted around the inner circumference of the first joint. The second fastening member has an inner diameter smaller than the outer diameter of the second joint under normal temperature conditions, and expands upon heating to an inner diameter that allows it to be fitted around the outer circumference of the second joint. An X-ray tube according to any one of claims 2 to 4.

6. At least one of the first fastening member and the first joint has a first positioning portion that restricts the axial movement of the first fastening member and positions the first fastening member relative to the first joint. An X-ray tube according to any one of claims 2 to 4.

7. At least one of the second fastening member and the second joint has a second positioning portion that restricts the axial movement of the second fastening member and positions the second fastening member relative to the second joint. An X-ray tube according to any one of claims 2 to 4.

8. The first fastening member and the second fastening member have a ring shape, Let P be the fastening pressure, P' be the anode load, and σ be the yield stress of the anode and the tube container. y The yield stress of the first fastening member and the second fastening member is σ y When the inner radius of the first fastening member and the second fastening member is R, the change in the inner radius of the first fastening member and the second fastening member is ΔR, and the Young's modulus of the first fastening member and the second fastening member is E, the wall thickness t of the first fastening member and the second fastening member is ・1σ y '99(σ y 12')・S 2 (ΔS・H) Satisfying the relationship, An X-ray tube according to any one of claims 2 to 4.

9. The yield stress of the first fastening member and the second fastening member is σ y When the inner radius of the first fastening member and the second fastening member is R, and the Young's modulus of the first fastening member and the second fastening member is E, the outer diameter D of the first fastening member is... o1 and the inner diameter D of the first joint iA but, D o1 <2σ y '・R / E+D iA The relationship is satisfied, and the inner diameter D of the second fastening member i2 and the outer diameter D of the second joint oB but, D i2 >D oB -2σ y '・R / E Satisfying the relationship, An X-ray tube according to any one of claims 2 to 4.

10. The first joint and the second joint, fastened together by the fastening member, have a welded joint portion between them. An X-ray tube according to any one of claims 1 to 4.

11. The anode is, The target, The rotating body to which the target is connected, A fixed body that rotatably supports the aforementioned rotating body, The fixed body is provided with the first joint, An X-ray tube according to any one of claims 1 to 4.

12. A method for manufacturing an X-ray tube in which the cathode and anode are housed in a tube container, The cylindrical first joint provided on the anode is inserted into the cylindrical second joint provided on the tube container. A fastening member is attached to at least one of the inner circumference of the first joint and the outer circumference of the second joint, and pressure is applied to the mating surfaces of the first joint and the second joint to fasten the first joint and the second joint together. A method for manufacturing X-ray tubes.

13. The fastening member is A first fastening member is mounted on the inner circumference of the first joint and pushes the first joint outward from the inside, thereby applying the pressure to the mating surface. A second fastening member is attached to the outer circumference of the second joint and tightens the second joint from the outside, thereby applying the pressure to the mating surface, Composed of, The method for manufacturing an X-ray tube according to claim 12.

14. The first fastening member has an outer diameter larger than the inner diameter of the first joint under normal temperature conditions, and is fitted to the inner circumference of the first joint by a cold fit. The second fastening member has an inner diameter smaller than the outer diameter of the second joint under normal temperature conditions and is attached to the outer circumference of the second joint by shrink fitting. The method for manufacturing an X-ray tube according to claim 13.

15. The fit between the first joint and the second joint before fastening by the fastening member is a clearance fit. A method for manufacturing an X-ray tube according to any one of claims 12 to 14.

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