JPH05205896A - X-ray generation apparatus - Google Patents

Abstract

PURPOSE: To prevent the insulation breakage in a high voltage chamber by broken pieces of a radiation shield, and to easily fit the radiation shield. CONSTITUTION: An X-ray tube 4 and a high voltage source 5 are stored in a high voltage chamber 6 in a casing 1 having a handle 2 on each end. A radiation shield 14 is provided on an outer surface of a cylindrical casing wall 12 around the high voltage chamber 6. The shield 14 can be fitted more easily compared than the conventional example in which the shield is provided on an inner surface of the casing wall. Broken pieces separated and detached from the shield 14 do not intrude the high voltage chamber 6, and the insulation breakage by the broken pieces of the shield 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 generator mainly used in the field, and a casing and an irradiation port housed in the casing and provided on a wall of the casing. An X-ray tube that radiates X-rays toward the X-ray tube. The present invention relates to an X-ray generator having the same.

[0002]

2. Description of the Related Art This type of X-ray generator is used for various field tests and inspections such as the test of welded joints of buildings and pipelines, but it is limited to the desired X-ray emission and other than desired directions. It is an essential requirement that sufficient shielding of the X-ray source be provided in order to prevent radiation to the radiation and to avoid the risk of X-ray exposure to workers. To that end, means must be provided to close the irradiation opening in order to minimize radiation during preheating and testing of the device.

[0003]

In prior art devices of the type described above, this shield is provided on the inner surface of a compartment or part of a normally cylindrical casing in which the X-ray tube is located. The high-voltage power supply that supplies electricity to the X-ray tube is placed in the same compartment as the X-ray tube, which is filled with insulating oil or insulating gas, that is, in the high-voltage chamber. The particles are in use or
For example, it has been found that there is a possibility of peeling and dropping when the casing is disassembled for replacement of the X-ray tube or cleaning of the inside of the compartment, and as a result, the risk of flashover (dielectric breakdown) of the high-voltage power source increases.

Further, since the mounting position of the radiation shield is inside the high voltage chamber, the mounting work of the radiation shield during manufacturing is troublesome and takes time.

In view of the above points, an object of the present invention is to provide an X-ray generator which avoids the occurrence of flashover due to the fragments of the radiation shield and facilitates the attachment of the radiation shield.

[0006]

[Means for Solving the Problems] In order to achieve the above object,
The present invention is a casing and housed in the casing,
An X-ray tube that emits X-rays toward an irradiation port provided on the wall of the casing, the casing further including means for supplying a high voltage to the X-ray tube, and X-rays in directions other than a desired direction. An X-ray generator having a radiation shield for preventing emission, at least a part of the radiation shield comprising:
It is mounted on the outer surface of the wall of the casing surrounding the X-ray tube.

The casing is substantially cylindrical,
In a representative example in which the X-ray tube and the irradiation port are provided in the wall surrounding the section in a limited section in the casing, the portion of the radiation shield attached to the outer surface is the limited section. A substantially entire radiation shield is externally provided on the cylindrical wall of the casing surrounding the high voltage chamber, which is a defined compartment. However, in some cases, it may be necessary to provide an auxiliary radiation shield member inside the casing only at one end or at both ends of the high voltage chamber. Such a member is relatively simple by removing the corresponding end wall of the casing. Reach.

In a preferred embodiment, the portion of the radiation shield mounted on the outer surface is protected by a protective cover. It is advantageous to construct such a protective cover with a shock absorbing material such as rubber, and if it is made in the shape of a rubber hose for easy mounting, it is possible to fit it so as to cover the outer surface radiation shield. is there.

The protective cover may be made of a strip of epoxy impregnated glass fiber material, and the protective cover may be made of a metal screen or a heat-shrinkable material.

[0010]

Since at least a part of the radiation shield is mounted on the outer surface of the wall of the casing surrounding the X-ray tube, the radiation shield can be mounted more easily, and the radiation shield can be installed in the high voltage chamber in the casing. It is possible to eliminate the possibility that there is debris that has peeled off from the surface.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Before explaining the embodiments of the present invention, first, the conventional X-ray generator shown in FIG. 1 will be explained. The device comprises a cylindrical casing 1 with carrying handles 2 at both ends. Electricity is supplied to this device via cable 3. An X-ray tube 4 is arranged together with a unipolar high-voltage power supply 5 in a high voltage chamber 6 of the casing between an electronic equipment chamber 7 at one end of the casing and a cooling radiator 8 at the other end of the casing. Inside the high-voltage chamber 6, a radiation shield 9 is provided on a cylindrical wall portion of a casing that surrounds the X-ray tube 4 and the high-voltage power source 5, and a disk-shaped horizontal shield is provided at both ends of the high-voltage chamber 6. Directional shield members 10, 11 are provided respectively.

A window for radiating X-rays from the X-ray tube in a desired direction, that is, an irradiation port 13 is formed in the radiation shield 9 in the portion covering the cylindrical wall 12 of the high voltage chamber 6. .. As shown in the figure, the irradiation port 13 can be in the shape of an opening that allows radiation at a predetermined spatial angle. It may be a slit in the circumferential direction that allows radiation to the.

As described above, when all the radiation shields 9, 10 and 11 are provided inside the high voltage chamber 6, the lead shield fragments may be used in the field or for cleaning and replacing the X-ray tube. There is a risk that the pieces may fall off during mechanical handling, and the fragments may cause flashover (insulation breakdown) in a high-voltage chamber filled with insulating oil or insulating gas, resulting in damage to the entire device.

In the embodiments of the X-ray generator of the present invention shown in FIGS. 2 and 3, the same reference numerals are given to the elements corresponding to the elements shown in FIG. 1 which is a prior art.

In the device according to the invention, the radiation shield 14
Is mounted on the outer surface of the cylindrical wall 12 of the high-voltage chamber 6 and is protected against corrosion by a protective cover 15 outside its radiation shield. Cooling radiator 8
The lateral radiation shield member 17 at the end of the high-voltage chamber 6 facing toward can also be provided on the outer surface of the end wall 18 of the high-voltage chamber 6.

In order to prevent mechanical damage to the outer radiation shield 14 during field use of the device, this protective cover 15 is advantageously made of a shock-absorbing material, for example by fitting it over the outer radiation shield 14. It can be manufactured in the shape of the rubber hose used.

Alternatively, the protective cover 15 may be attached in the form of a band of epoxy impregnated glass fiber material and may be constructed of a metal screen or a heat shrinkable material.

Although the present invention has been described above with reference to an X-ray generator having a single-pole high-voltage power supply, it can be similarly applied to an X-ray generator having a double-pole high-voltage power supply.

[0019]

According to the present invention, since the radiation shield is attached to the outer surface of the wall of the casing surrounding the X-ray tube, the radiation shield can be easily attached. Further, even if debris is peeled off from the radiation shield, It does not enter the high-voltage chamber in the casing and eliminates the risk of dielectric breakdown due to shield debris. Further, mounting the radiation shield on the outer surface allows the radiation shield to be mounted by alternative methods such as plasma spraying.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view of a conventional typical field work X-ray generator.

FIG. 2 is a partial cross-sectional view of a preferred embodiment of the X-ray generator of the present invention.

3 is an enlarged sectional view of a portion A of the casing wall of the device shown in FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Casing 4 X-ray tube 5 High voltage supply means 6 High voltage chamber (limited section) 9, 10, 11, 14 Radiation shield 12 Wall 13 Irradiation port 15
Protective cover

Claims (9)

[Claims] 1. A casing (1) and an X-ray tube (4) which is housed in the casing and emits X-rays toward an irradiation port (13) provided in a wall (12) of the casing. The casing further comprises means (5) for supplying a high voltage to the X-ray tube (4), and a radiation shield (9, 10, 11) for preventing emission of X-rays in directions other than the desired direction. X-ray generator, characterized in that at least a part (14) of the radiation shield is attached to the outer surface of the wall (12) of the casing surrounding the X-ray tube (4). 2. The casing (1) is substantially cylindrical, the X-ray tube (4) and the wall (12) surrounding this compartment in a defined compartment (6) in the casing.
The X-ray generator according to claim 1, wherein the irradiation opening (13) and the irradiation opening (13) are respectively provided in the limited area (6) surrounded by the part (14) of the radiation shield. X-ray generator according to claim 1, characterized in that it constitutes substantially all of the radiation shield mounted on the cylindrical wall (12) of the casing. 3. The portion of the radiation shield (14)
The X-ray generator according to claim 1 or 2, characterized in that it is protected by a protective cover (15). 4. X-ray generator according to claim 3, characterized in that the protective cover (15) comprises a shock absorber. 5. The X-ray generator according to claim 4, wherein the shock absorbing material is rubber. 6. The X-ray generator according to claim 5, wherein the shock absorber is formed in the shape of a rubber hose fitted to the radiation shield of the outer surface attached to the casing. 7. X-ray generator according to claim 3, characterized in that the protective cover (15) is composed of a band of epoxy impregnated glass fiber material. 8. X-ray generator according to claim 3, characterized in that the protective cover (15) is composed of a metal screen. 9. X according to claim 3, characterized in that the protective cover (15) is made of a heat-shrinkable material.
Line generator.