CN2203496Y

CN2203496Y - X-ray tube

Info

Publication number: CN2203496Y
Application number: CN 94202988
Authority: CN
Inventors: 刘振琴; 周仕涛
Original assignee: Individual
Current assignee: Individual
Priority date: 1994-02-05
Filing date: 1994-02-05
Publication date: 1995-07-12
Anticipated expiration: 2004-02-05

Abstract

The utility model relates to an X-ray tube, particularly a cone-shaped rake type 360 DEG circumferential directional radiating X-ray tube which is mainly used for a fume insulating portable defectoscope. The utility model is characterized in that a circular helical filament is arranged in the circular groove in the waist of the focusing electrode of an axial symmetry focusing system, which forms an electron gun with hollow electron beams, the hollow electron beams hit a circular area on the side of the cone rake, and then the 360 DEG circumferential directional radiations are generated and radiated out of the tube through a cylindrical beryllium window. The utility model has the advantages of good heat radiating performance, easy centring, uniform intensity in any direction, and the commercial production is convenient to realize.

Description

X-ray tube

The utility model relates to a kind of X-ray tube, the circumferential radiation X ray pipe of particularly a kind of conical shape harrow.

Toshiba Corp is at the described circumferential X-ray tube of Chinese patents CN85106786, and its structure is: it is flat around coiled filament that a garden dish type is housed bottom the focusing electrode dimple in the axial symmetry focusing system, forms the lower slightly solid electron beam of center density.This solid electron beam is beaten at the conical shape harrow head, produces sphere and radiates X ray, and the beryllium window of transmitted X-rays directly is welded on anodic protection cover and the shell, and solid electron beam passes through the adjustment of pipe male screw thread with the centering of awl rake with deformability vacuum seal bellows.This complex structure is given to make and is also caused very big difficulty, and the easily fusing of rake point, and circumferentially uniformity is difficult to guarantee.

It is a kind of simple and reliable for structure that the purpose of this utility model is to provide, and perfect heat-dissipating is easy to centering, and each is even to intensity, is easy to the circumferential X-ray tube of realizing that commercialization is produced.

The purpose of this utility model can realize by following measure: circumferential X-ray tube described in the utility model, in the axial symmetry focusing system of its electron gun, waist forms a cannelure in the focusing electrode, garden toroidal helical filament is placed on groove top, produce the hollow electron beam of an appropriate size, this hollow electron beam is beaten on the side of the awl rake that is guaranteed centering by accessory size, produces 360 ° of X-radiations of annular, and circumferentially ray passes outside the tubular beryllium window efferent duct of garden; Tube two ends, beryllium window garden and the ring vacuum tight sealing-in of reinforcing garden, reinforcing ring is connected with argon arc welding with the anterior respective flange dish of drag head and anode.

Fig. 1 is the whole cutaway view of X-ray tube described in the utility model;

Fig. 2 is the extreme local amplification view of electron gun focusing.

Introduce the utility model in detail below in conjunction with accompanying drawing:

As shown in Figure 1, knob screw 9, insulator 6 and setscrew nut 4 are assembled into stem stem by centre bore; Garden toroidal helical filament 8 is fixed on appropriate location, insulator 6 top; As shown in Figure 2, two terminations 22,23 of filament 8 are welded on the lead-in wire that insulator 6 correspondence positions stretch out, and are in close proximity to each other, but do not collide, and the lead-in wire lower end is connected on the insulator lead-in wire 5 on the support 3, leads to male union; In order to make filament straight and even firmly, in 90 ° of positions, interval other three strong points 24 are set, at the strong point 24 places, thin molybdenum filament one end is on filament 8, and the other end is fixed on the lead-in wire that stretches out insulator 6 relevant positions; The filament stem stem assembly that installs as stated above is fixed on electron gun support 3 centers by the screw among Fig. 17; Focusing electrode 11 is metal cylinder that there is protruding rafter inside, and the pilot hole that two screws 10 pass on the protruding rafter is fixed on support 3 tops with focusing electrode 11, forms the annular gap between protruding rafter Nei Yuan hole and knob screw 9 heads; Filament 8 just in time is in this top, annular gap, constitutes straight and even axial symmetry hollow electron beam electron gun.

Garden tubular beryllium window 16 two ends become the beryllium window assembly with reinforcing ring 15,17 vacuum tight sealing-ins among Fig. 1; The drag head assembly is provided with conical shape harrow 20, the heat radiation cover connects screw 21, ring flange 18; The anode front portion comprises anode garden dish 12, base 13 and ring flange 14, and anode component and beryllium window assembly constitute circumferential X ray generation and output system by being connected from 14,18 argon arc weldings of centering ring flange.

The big openend of insulation shell 1 is connected by the argon arc welding structure with anode disc 12, and little openend is connected by the argon arc welding structure with the bottom of electron gun 2, forms the high vacuum seal homogeneous tube jointly.Shell 1 is the available metal ceramic cartridge both, and also the useable glass shell only needs to keep above-mentioned electron gun, awl target and beryllium window construction constant, and syndeton is made corresponding modify, just can the practicable embodiment of supporting formation.

Press the circumferential X-ray tube of said structure manufacturing, the centering problem is guaranteed in the present part processing margin of tolerance easily, need not to do any pipe and adjusts outward; All directions X ray intensity changes in the actual centering margin of tolerance not quite; Hollow electron beam is parked in awl rake middle and upper part, side annulus, closes on the good copper body of heat conduction, the no electron bombard of awl point, and awl rake heat dispersion improves greatly.Therefore the utlity model has perfect heat-dissipating, be easy to centering, each is even to X ray intensity, is easy to the advantage that realizes that commercialization is produced.This class cast is mainly used in the portable defectoscope of the edge of drawing last breath.

Claims

1, a kind of X-ray tube is to become the vacuum seal homogeneous tube by shell (1), electron gun (2) with the anode component mutual group, anode component comprises awl rake (20), garden tubular beryllium window (16), it is characterized in that: the interior waist of the focusing electrode of electron gun (11) forms a cannelure, garden toroidal helical filament (8) is placed on groove top, tube two ends, beryllium window garden and ring (15,17) the vacuum tight sealing-in of reinforcing garden, reinforcing ring (15,17) is connected with argon arc welding with the anterior respective flange dish of anode (14,18) with drag head.

2, according to the described X-ray tube of claim 1, it is characterized in that:

A. knob screw (9), insulator (6) and setscrew nut (4) are assembled into stem stem by centre bore, garden toroidal helical filament (8) is fixed on appropriate location, insulator (6) top, two terminations (22 of filament (8), 23) be welded on the lead-in wire that insulator (6) correspondence position stretches out, be in close proximity to each other, but do not collide, the lead-in wire lower end is connected on the insulator lead-in wire (5) on the support (3), lead to male union, in 90 ° of positions, interval other three strong points (24) are set, locate at the strong point (24), thin molybdenum filament one end is on filament (8), the other end is fixed on the lead-in wire that stretches out insulator (6) relevant position, and garden toroidal helical filament (8) is positioned at the top, annular gap, garden of focusing electrode (11) convex rafter and the formation of knob screw (9) head.

B. garden tubular beryllium window (16) two ends become the beryllium window assembly with reinforcing ring (15,17) vacuum tight sealing-in, the drag head assembly is provided with conical shape harrow (20), the heat radiation cover connects screw (21), ring flange (18), the anode front portion comprises anode garden dish (12), base (13) and ring flange (14), and anode component and beryllium window assembly are by being connected from centering ring flange (14,18) argon arc welding.