CN216015286U

CN216015286U - Rotary anode X-ray tube bearing fixing device

Info

Publication number: CN216015286U
Application number: CN202122164936.6U
Authority: CN
Inventors: 汪上杰; 王啸; 方奇; 邱隆华
Original assignee: Maimo Vacuum Technology Wuxi Co ltd
Current assignee: Maimo Vacuum Technology Wuxi Co ltd
Priority date: 2021-09-08
Filing date: 2021-09-08
Publication date: 2022-03-11
Anticipated expiration: 2031-09-08

Abstract

The utility model relates to a ray tube, especially a rotatory anode X-ray tube bearing fixing device, include: the bearing sleeve is a hollow pipe; the connecting seat is welded at one end of the bearing sleeve and is arranged coaxially with the bearing sleeve, the connecting seat is also welded on the anode shell in a sealing manner, and the bearing sleeve is positioned inside the anode shell. The utility model provides a pair of rotatory anode X-ray tube bearing fixing device reduces the processing cost through adopting tubular product to reduce seal welded welding quantity through the connecting seat, structure and simple process, leakage point are few, with low costs, the product percent of pass is high, and prolonged the life of ray tube.

Description

Rotary anode X-ray tube bearing fixing device

Technical Field

The utility model relates to an X-ray tube, especially a rotatory positive pole X-ray tube bearing fixing device.

Background

With the rapid development of science and technology, the variety of medical equipment is increasing, and the application in medical work is also becoming more extensive. X-ray tubes are used to generate X-rays, and play an important role in various fields such as medical diagnosis, safety inspection, and nondestructive inspection. The basic principle of the X-ray tube is that thermal electrons thermally excited by the cathode filament strike the target plate under the action of the cathode and anode accelerating electric field. Wherein 1% of the energy is converted to X-rays and emitted through the window, and the remaining about 99% of the energy is converted to thermal energy. The shell is the X-ray tube made of hard glass, and as the service life increases, the deposition of a layer of tungsten is attached to the glass wall due to the evaporation of the filament and the evaporation of the tungsten at the cracking edge of the anode target surface, so that the bombardment erosion of high-speed electrons to the glass wall cannot be avoided, and finally the glass is punctured to damage the X-ray tube. In order to eliminate the effect of the tungsten deposition layer and prolong the service life of the X-ray tube, a metal ceramic or metal glass high-power rotary anode X-ray tube is widely used in the market. The filament and anode target disk of such high power rotating anode X-ray tubes are similar to those of the common rotating anode X-ray tubes, and the other limiting factors of the rotating anode X-ray tubes are the life of the bearings and the vacuum degree in the tubes, and the bearings are worn seriously to cause the rotation speed of the anode not to be reached and to cause the noise to be increased. And the reduction of the vacuum degree in the tube can directly influence the high-voltage insulation of the cathode and the anode.

The bearing sleeve is used as a supporting part of the bearing, the other end of the bearing sleeve is connected with the anode shell 1, and as shown in fig. 4, the bearing sleeve 6 is connected with the anode shell 1 through welding to form a closed cavity. The bearing housing is constructed as shown in fig. 5, and is composed of a connecting ring 7 and a copper base 6, which are connected by brazing. The problems with this structure are mainly:

1. the connection between the connecting ring 7 and the copper substrate 6 has higher air tightness requirement, once air leaks, the vacuum degree in the tube core is lower, so that the performance of the tube core is influenced, and in the actual production process, the brazing process is more complex, the requirement is high, the rejection rate is certain, and the cost is higher;

2. the copper matrix 4 is formed by processing solid bars, so the cutting processing amount is large, and the processing cost is high.

SUMMERY OF THE UTILITY MODEL

In order to solve the above problems, the utility model provides a simple structure, sealed welding department is few, the welding requires low, the finished product qualification rate is high, with low costs a rotatory anode X-ray tube bearing fixing device, and concrete technical scheme is:

a rotary anode X-ray tube bearing fixture comprising: the bearing sleeve is a hollow pipe; the connecting seat is welded at one end of the bearing sleeve and is arranged coaxially with the bearing sleeve, the connecting seat is also welded on the anode shell in a sealing manner, and the bearing sleeve is positioned inside the anode shell.

Preferably, the connecting seat is provided with a positioning column, and the positioning column is inserted into the bearing sleeve.

Compared with the prior art the utility model discloses following beneficial effect has:

the utility model provides a pair of rotatory positive pole X-ray tube bearing fixing device reduces the processing cost through adopting tubular product to reduce seal welding's welding quantity through the connecting seat, structure and simple process, leakage point are few, with low costs, the product percent of pass is high, and prolonged X-ray tube's life.

Drawings

FIG. 1 is a cross-sectional view of a rotary anode X-ray tube bearing fixture;

FIG. 2 is a cross-sectional view of an assembly of the connecting socket and bearing housing;

FIG. 3 is a schematic structural diagram of an assembly of a connecting seat and a bearing sleeve;

FIG. 4 is a cross-sectional view of a prior art copper base in connection with a connecting ring and an anode casing;

figure 5 is a cross-sectional view of the assembly between the connecting ring and the copper base.

Detailed Description

The present invention will now be further described with reference to the accompanying drawings.

As shown in fig. 1 to 3, a bearing fixing device for a rotary anode X-ray tube comprises a bearing sleeve 2 and a connecting seat 3; the bearing sleeve 2 is a hollow pipe; a positioning column 31 is arranged on the connecting seat 3, the positioning column 31 is inserted into the bearing sleeve 2, the diameter of the positioning column 31 is slightly smaller than the inner diameter of the bearing sleeve 2, the insertion is convenient, the coaxiality can be ensured, and the positioning column 31 is convenient to assemble, weld and position; the diameter of connecting seat 3 is unanimous with the external diameter of bearing housing 2, forms shaft shoulder 32 between reference column 31 and the connecting seat 3, and shaft shoulder 32 presses the tip at bearing housing 2 to fix on bearing housing 2 through the welded mode, connecting seat 3 is inserted on positive pole casing 1, and carries out seal weld through brazing, and bearing housing 2 is located the inside of positive pole casing 1.

Because the bearing sleeve 2 is positioned in the anode shell 1, the connecting seat 3 and the bearing sleeve 2 do not need to be sealed and welded, and the connecting seat 3 and the anode shell 1 only need to be sealed and welded, so that the welding workload is reduced, the welding cost is reduced, leakage points are reduced, the sealing reliability is improved, and the service life of the ray tube is prolonged.

The bearing sleeve 2 adopts a pipe material, so that the machining amount is greatly reduced, and the material and machining cost is reduced. The pipe of the bearing sleeve 2 can be made into a copper section according to the size requirement, and has convenient processing and low cost.

Because the junction between connecting seat 3 and bearing housing 2 is located anode casing 1, braze between connecting seat 3 and the bearing housing 2 as long as the welding is firm can, do not have the leakproofness requirement, make whole X-ray tube reduce a leak source to reduce the risk of gas leakage, further guaranteed the performance and the life-span of X-ray tube, also reduced the scrapping after brazing, improved the qualification rate, the cost is reduced.

The technical principle of the present invention is described above with reference to specific embodiments. The description is made for the purpose of illustrating the principles of the invention and should not be construed in any way as limiting the scope of the invention. Based on the explanations herein, those skilled in the art will be able to conceive of other embodiments of the present invention without any inventive effort, which would fall within the scope of the claims of the present invention.

Claims

1. A rotary anode X-ray tube bearing fixture, comprising:

the bearing sleeve (2), the said bearing sleeve (2) is the hollow tubular material; and

the connecting seat (3), the welding of connecting seat (3) is in bearing housing (2) one end, and with bearing housing (2) coaxial line sets up, connecting seat (3) still seal weld is on anode casing (1), bearing housing (2) are located the inside of anode casing (1).

2. A rotating anode X-ray tube bearing fixture according to claim 1, characterized in that the connection base (3) is provided with positioning posts (31), and the positioning posts (31) are inserted into the bearing housing (2).