JPH10106790A - X-ray irradiation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent damage to and degradation of a pressured element by arranging a wet lubricant on the outside surface side of the pressured element to constitute a part of a vessel to cover an X-ray tube. SOLUTION: In order to absorb a volume change by a temperature change in insulating oil 50, elastically deformable bellows (a pressured element) 51 is arranged inside a vessel main body 40. The bellows 51 has a bottom wall part 51a and a peripheral wall part 51b, and its peripheral edge is fitted to a spigot 40a formed on one end inner periphery of the vessel main body 40. The inside surface side of the bellows 51 constitutes a part of a wall to surround a sealing space of the insulating oil 50. A space 52 leading to the outside of a vessel 2 is formed between the bellows 51 and one end part of the vessel main body 40, and a sealing 53 is fitted to the spigot 40a so that infiltration of the insulating oil 50 into its space 52 can be prevented. Therefore, the outside surface side of the bellows 51 contacts with the atmosphere. A wet lubricant 59 such as oil and grease is applied over the whole surface to the outside surface side of the bellows 51. Abrasion by contact between a part of the bellows 51 can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an X-ray irradiator in which insulating oil is sealed in a container covering an X-ray tube.

[0002]

2. Description of the Related Art As an X-ray irradiator used in a medical X-ray diagnostic apparatus or the like, a container covering an X-ray tube is provided with an X-ray.
Insulating oil is used for insulating and cooling wires. In this case, the insulating oil expands due to temperature fluctuation,
Since the volume fluctuates due to repeated shrinkage, in order to absorb the volume fluctuation, a part of the wall surrounding the space filled with the insulating oil is formed by the inner surface of a pressure receiving element called a rubber bellows that can be elastically deformed. ing.

[0003]

Since the pressure receiving element is constantly deformed in accordance with the change in the volume of the insulating oil, if the element is reduced in size, parts on the outer surface may come into contact with each other and become worn. Further, the outer surface side of the pressure receiving element comes into contact with the atmosphere, and an elastic material such as rubber, which is a constituent material of the pressure receiving element, is easily deteriorated by oxygen or ozone in the air and is easily cracked. Therefore, there is a possibility that problems such as breakage of the pressure receiving element and leakage of insulating oil may occur. In particular, there are various types of equipment in an examination room such as a hospital where an X-ray irradiator is used, and the concentrations of oxygen and ozone tend to be higher than those in a general environment. Therefore, deformation is large and frequent, and wear is easily caused.

[0004] It is an object of the present invention to provide an X-ray irradiator capable of solving the above-mentioned problems.

[0005]

SUMMARY OF THE INVENTION The present invention provides an X-ray tube,
A container for covering the X-ray tube, and a pressure receiving element having a part of a wall surrounding a space for enclosing the insulating oil in the container by the inner surface side thereof; An X-ray irradiator capable of absorbing volume fluctuations is characterized in that a wet lubricant is applied to the outer surface of the pressure receiving element.

According to the structure of the present invention, even if the outer surfaces of the pressure receiving elements are partially in contact with each other, the friction between the contact portions can be reduced by the lubricant, so that the pressure receiving elements can be prevented from being worn. Further, since the outside of the container of the pressure receiving element can be shielded from the outside air by the lubricant, it is possible to prevent rubber or the like, which is a material of the pressure receiving element, from being deteriorated by oxygen or ozone.

[0007]

Embodiments of the present invention will be described below with reference to the drawings.

The X-ray irradiator shown in FIG. 1 includes a rotating anode type X-ray tube 1 and a container 2 that covers the X-ray tube 1.

The X-ray tube 1 has a focusing electrode 11, an anode 12, and a glass bulb 13 covering the focusing electrode 11 and the anode 12. The focusing electrode 11 is fixed to a glass bulb 13 and has a filament 14 that emits thermoelectrons when a high voltage is applied. The anode 12
Is a disk-shaped target 15 facing the filament 14, a rotor 16 attached to the target 15 coaxially and rotatably with the target 15, and a rotor 16
And a holder 30 supporting the pair of rollers via a pair of rolling bearings 17 and 18 so as to be relatively rotatable. The holder 30 is fixed to the glass bulb 13.

The container 2 has a hollow container body 40, in which an anode holder 41, a cathode holder 42, and a stator 43 are provided.
1 holds the holder 30 of the anode 12 of the X-ray tube 1, holds the cathode side of the glass bulb 13 by its cathode holder 42, surrounds the rotor 16 of the anode 12 by its stator 43, and furthermore, A protective lead 44 is attached to the inner periphery of the X-ray tube so as to cover the X-ray tube 1. The container main body 40 is provided with X-rays so that X-rays generated by the collision of the thermoelectrons with the target 15 can be applied to the outside of the container 2.
An X-ray irradiation window 45 is formed, and the X-ray irradiation window 45 is covered by a cover 46 that transmits X-rays. Further, the container main body 40 is provided with a cable receptacle 47 for drawing out a wiring cable to the X-ray tube 1 to the outside of the container 2.

An insulating oil 50 is sealed inside the container body 40 for insulating and cooling the X-ray tube 1. An elastically deformable bellows (pressure-receiving element) 51 formed of rubber, synthetic resin, or the like is provided inside the container body 40 in order to absorb the repeated expansion and contraction of the insulating oil 50 due to the temperature change, that is, to absorb the volume fluctuation. ing. The bellows 51
Has a bottom wall portion 51a and a peripheral wall portion 51b, and its peripheral edge is fitted to a spigot 40a formed on the inner periphery of one end of the container body 40. The inner surface side of the bellows 51 constitutes a part of a wall surrounding a space in which the insulating oil 50 is sealed. Also,
A space 52 communicating between the bellows 51 and one end of the container body 40 through the gap (not shown) to the outside of the container 2.
Is formed, and the seal ring 53 is attached to the spigot 40a so as to prevent the insulating oil 50 from entering the space 52.
Is fitted. Thereby, the bellows 51
The outer surface side of is in contact with the atmosphere.

A wet lubricant 59 such as oil or grease is applied to the entire outer surface of the bellows 51. Thus, even if the outer surfaces of the bellows 51 are partially in contact with each other, the friction between the contact portions can be reduced by the lubricant 59, so that the bellows 51 can be prevented from being worn. Further, the bellows 51 can be shielded from outside air by the lubricant 59, so that the bellows 51
It is possible to prevent the rubber or the like, which is the material, from being deteriorated by oxygen or ozone. The oil or grease used as the lubricating material 59 is preferably excellent in lubricity, affinity with rubber, and drying resistance at high temperatures (generally, about 85 ° C.). Grease is preferred.

The present invention is not limited to the above embodiment. For example, a sealed space for insulating oil may be provided outside the container, and a part of the wall surrounding the sealed space may be configured by the inner surface side of the pressure receiving element. For example, the insulating oil 50 shown in FIG.
Is connected. The circulating device 60 sucks the insulating oil 50 in the container body 40 by a pump 62 through a pipe 61 and the air-cooled radiator 6 with a fan 63a.
After being cooled by the radiator 63, it is circulated through the pipe 61 to the container body 40. An auxiliary container 65 is connected to the pipe 61, and an elastically deformable bellows (pressure receiving element) 66 formed of rubber, synthetic resin, or the like is provided inside the auxiliary container 65. The bellows 66 has a bottom wall portion 66a and a peripheral wall portion 66b, and the peripheral edge thereof is connected to the inner surface of the auxiliary container 65. This bellows 6
6 has insulating oil 5 introduced into the auxiliary container 65.
It constitutes a part of the wall surrounding the zero enclosed space. Further, a through hole 65 is provided between the bellows 66 and one end of the auxiliary container 65.
A space 67 communicating with the outside of the auxiliary container 65 is formed through the seal ring 68 and the bellows 66 and the auxiliary container 6 so that the insulating oil 50 can be prevented from entering the space 67.
5 is provided. Thereby, the outer surface side of the bellows 66 comes into contact with the atmosphere. The elastic deformation of the bellows 66 can absorb repeated expansion and contraction of the insulating oil 50 due to a temperature change. The outer surface of the bellows 66 is coated with a wet lubricant 69 similar to the lubricant 59 over the entire surface. Thus, even if a part of the bellows 66 on the outer side of the container comes into contact, wear can be prevented because the friction between the contact portions is small. Further, the lubricant 6
9, the outside of the container of the bellows 66 can be shielded from the outside air, so that the rubber or the like, which is a material of the bellows 66, can be prevented from being deteriorated by oxygen or ozone. Note that the bellows may be provided on at least one of the container 2 side and the auxiliary container 65 side.

[0014]

According to the present invention, it is possible to provide an X-ray irradiator which can prevent the pressure receiving element for absorbing volume fluctuation of insulating oil from being damaged or deteriorated and can be used stably for a long period of time.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of an X-ray irradiation apparatus according to an embodiment of the present invention.

FIG. 2 is a configuration explanatory view of a circulation device connected to an X-ray irradiation device according to a modification of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 X-ray tube 2 Container 50 Insulating oil 51, 66 Bellows (pressure receiving element) 59, 69 Lubricant

Claims (1)

[Claims] An X-ray tube, a container covering the X-ray tube, and a pressure-receiving element that forms a part of a wall surrounding a space for enclosing insulating oil in the container with an inner surface side thereof, An X-ray irradiator capable of absorbing volume fluctuations of said insulating oil by elastic deformation of said pressure-receiving element, wherein a wet lubricant is applied to an outer surface side of said pressure-receiving element.