JPS6378499A - X-ray tube device - Google Patents

Abstract

PURPOSE:To enable an X-ray tube storage container to be structured in a compact size by containing the elastic rubber tube of an insulating oil expansion absorber in the storage container with its open end fixed to the wall of storage container in communication with outer air but the other end sealed. CONSTITUTION:An insulating oil expansion absorber 31, consists of an elastic rubber tube 32 wound spirally and arranged coaxially on the peripheral of a high tension cable receptacle 19 in an X-ray tube storage container 11. The open end 33 of the tube 32 is fixedly connected liquid-tight to a section of a container side plate 18 in communication with outer air. And, the outer end 34 is sealed and extended into the storage container. A core pipe 35 similarly formed in a spiral is inserted to prevent the tube from partially breaking under oil pressure with air trapped in the other end. Since the insulating oil expansion absorber is completely contained in the X-ray tube storage container in the way, a small and compact storage container can be structured.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to an X-ray tube device, and particularly relates to an improvement of a device for absorbing thermal expansion of insulating oil.

(Prior Art) FIG. 4 shows a cross section of an X-ray tube device of a conventional X-ray mammography apparatus. A rotary anode type Xi tube 12 is housed and fixed in an X-win/α storage container 1 called a Haube. The X-ray tube 12 has a rotor portion including an insulating tube 13 and a stator 14.
, is fixedly held on the container via a support arm 15. Further, the X-ray output section 16 is exposed to the outside through the X-ray emission window 17 and is fixed. Opening IC of storage container 11
A side plate 18 is attached to the a part 12a, and a cylindrical high voltage cable holder J9 made of an insulator is attached to the inner side of the side plate 18. These side plates and the high voltage cable holder serve as a lid for the container. In addition, insulating oil 20
is filled.

An insulating oil expansion absorber 2 is integrally provided on a part of the outer periphery of the storage container to absorb insulating oil that heats up and thermally expands due to the operation of the apparatus. In this insulating oil expansion absorber 21, a part of the container wall itself is bulged outward, and a bag-shaped or bowl-shaped bellows 22 is electrically distributed inside the wall. Bellows 22
is made of oil-resistant rubber, has an O-ring integrally formed around the opening, and is fixed liquid-tightly by a cover plate 23 having ventilation holes. The thickness of the bellows 22 is usually 0.
At about 5 to 2 meters, it collapses into an arbitrary shape due to the thermal expansion of the insulating oil and absorbs the expansion of the oil.

(Problems to be Solved by the Invention) By the way, according to such a conventional structure, especially in a mammography X-ray tube device such as 91J, the distance f from the center of the X-ray emission window 17 to the other end of the storage container is , f L must be made as short as possible, which results in a structure in which the insulating oil expansion absorber 2 protrudes relatively largely from the storage container to the outside. Therefore, the entire X-ray tube device becomes relatively large, and the container itself has a complicated shape, making it difficult to manufacture. Furthermore, the bellows expands and contracts rapidly due to repeated operations of the x-ray tube apparatus, and is susceptible to damage from rubbing against the container walls.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an X-ray tube device that eliminates the above-mentioned inconveniences, allows a compact X-ray tube container, and improves the reliability of the insulating oil expansion absorber.

[Structure of the Invention] (Means for Solving the Problems) This invention provides an absorber that absorbs thermal expansion of insulating oil filled in an X-ray tube storage container, which is formed by spirally forming an elastic rubber tube. Alternatively, it is an X-ray tube device that is arranged in a straight line and housed in a container, with an opening at one end connected to a part of the wall of the container so as to communicate with the outside air, and the other end closed within the container.

(Function) According to this invention: 1. Since the insulating oil expansion absorber is completely housed within the X-ray tube storage container, the storage container can be constructed in a compact and compact manner.

In addition, the absorbent body is not rubbed against the container wall, and there is almost no risk of damage. Therefore, a highly reliable device can be obtained.

(Example) Examples thereof will be described below with reference to the drawings.

Identical parts are designated by the same reference numerals.

As shown in Figures 1 to 3, the insulating oil expansion absorber is
An elastic rubber tube 32 is wound spirally,
They are arranged coaxially around the outer periphery of the high voltage cable receiver 19 inside the X-ray tube housing container 1.

One end opening 33 of the tube 32 is located at a portion of the container side plate 18. It is tightly and widely fixed and communicated with the outside air. And one end 34 is closed and extends into the container. Inside this tube 32, a core ieve 35 is molded in the same spiral shape to prevent the tube from being partially collapsed due to hydraulic pressure and leaving behind air at the mouth. This core pipe 35 is made of metal or plastic that is hard enough not to be crushed by hydraulic pressure. Also, small through holes 36 are formed at regular intervals in some places in this core pipe. The tube 32 and the open end 37 are communicated with the outside air.Thereby, part of the exhaust due to the contraction of the tube 32 and the intake due to the expansion are carried out smoothly over the entire length of the tube 32, and the expansion of the insulating oil, It can quickly and stably follow the contraction.Such a spiral rubber tube is further installed on the outer periphery of a guide cylinder 38 made of an insulator.This guide cylinder 38 includes:
A large number of through holes 39 are bored so as not to impede the flow of the insulating oil.

This guide cylinder 38 is fixed to the container side plate 8,
An insulating oil expansion absorber is supported by this side plate. Therefore, when assembling, the guide cylinder 38 and the insulating oil absorber 91 are fixed to the side plate in advance and inserted into each vessel.
Can be fixed.

Note that the insulating oil expansion absorber made of a long rubber tube is not limited to a spiral configuration, and may be configured in a nearly straight line to distribute power within the container. In that case, power should be distributed to a place where natural expansion and contraction can be ensured stably.

The appropriate material for the tube is one that is oil resistant, such as nitrile rubber, urethane rubber, polysulfide rubber, or acrylic rubber, but other materials may be used as long as they are oil resistant and heat resistant to the maximum temperature of the insulating oil. The material may also be used.

Furthermore, if the rubber tube itself has sufficient shrinkage, the core no! There is no need for Eve.

[Effects of the Invention] As described above, according to the present invention, there is no need to form an undesired protrusion on the X-ray tube housing container, and the X-ray tube container can be constructed in a continuous manner. Further, there is almost no risk of damage to the insulating oil expansion absorber, and therefore a highly reliable device can be obtained. In particular, with the configuration in which the core pipe is inserted, unexpected deformation of the tube can be prevented, and safe operation can be maintained by reliably following the expansion and contraction of the insulating oil.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention, FIGS. 2 and 3 are sectional views of essential parts thereof, and FIG. 4 is a longitudinal sectional view showing a conventional structure. 11... X-ray tube storage container, 12... X-ray tube, 19.
...High voltage cable holder, 20...Insulating oil, 3...
Insulating oil expansion absorber, 32...Rubber tube, 35.
... Core, Yave, 36... Small through hole. Patent attorney Takehiko Suzue Figure 2 Figure 3

Claims (3)

[Claims] (1) An X-ray tube housing container filled with insulating oil and partially provided with a high-voltage cable receiver, an X-ray tube fixed within this housing container, and an X-ray tube installed inside the housing container. An X-ray tube device comprising an insulating oil expansion absorber, wherein the insulating oil expansion absorber is housed in the housing container in the form of a spiral or straight elastic rubber tube;
An X-ray tube device characterized in that one end of the opening is attached to a part of the container wall in communication with the outside air, and the other end is closed within the container. (2) The X-ray tube device according to claim 1, wherein the insulating oil expansion absorber is formed by inserting a core pipe in which small through holes are formed at regular intervals into a rubber tube. (3) The insulating oil expansion absorber is a patent claim in which a rubber tube is formed into a spiral shape, and power is coaxially distributed around the outer periphery of a cylindrical high-voltage cable holder that projects inward of the storage container. The X-ray tube device according to item 1.