JPS6129096B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a portable X-ray apparatus for detecting cracks, pinholes, etc. in a subject made of, for example, iron pipes or steel materials.

[Technical background of the invention]

Conventionally, this type of X-ray transmission apparatus is a large fixed type, and as shown in FIG. In order to carry out transmission inspection by means of an insulating oil, a cylindrical anode 3 with a bottom is provided at the end of the casing 1 filled with insulating oil so that its bottom protrudes outward from the casing. A target 5 is installed diagonally at the inner bottom, an irradiation window 9 is formed in the anode 3 located on the output optical path of the target 5, and an insulator 6 serving as an X-ray tube is installed inside the housing so as to surround the opening of the anode 3. is stored and fixed,
A cathode 8 integrated with the filament coil 7 is attached to the end plate of the insulator 6, facing the target 5. A high voltage cable 20 from an external large transformer is connected to the cathode 8, and a high voltage cable 20 is connected to the anode target. A coolant pipe 2 is connected from an external pump to a forced liquid cooling groove 21 formed on the back side of the
2 are connected.

The above-mentioned X-ray apparatus has a structure in which a shock-resistant insulator is used for the X-ray tube, and since the target 5 protruding outward from the housing emits X-rays, absorption of soft X-rays can be prevented. In addition, since it is a stationary type, oil is used as the insulating medium inside the housing, although it is heavy, it has low thermal expansion and does not require sufficient consideration for airtightness. As for the cooling method, forced liquid cooling with high cooling capacity is used, although equipment such as pumps and piping is essential.

[Problems with background technology]

However, in order to inspect iron pipes, steel materials, etc. placed at the site, a portable configuration is required, but the above-mentioned X-ray equipment requires a pipe for forced liquid cooling. It is difficult to use it for carrying around.

Furthermore, stationary type X-ray apparatuses are usually used in X-ray shielding rooms, and even in the above-mentioned X-ray apparatuses, no measures have been taken regarding structures that block leaked X-rays.

[Purpose of the invention]

The present invention has been made in view of the above-mentioned circumstances.In the first invention, gas is used as an insulating medium in the housing to reduce weight, and the outer anode of the target is forcedly air-cooled, thereby making it portable. A second aspect of the present invention provides an X-ray apparatus, and furthermore, it is possible to effectively block even a small amount of X-rays leaking to the outside of the housing.

[Summary of the invention]

In the first aspect of the present invention, the heat dissipation fins of the anode are fitted and the outer periphery of the target is forcedly air-cooled, and when this air cooling causes thermal expansion of the insulating gas in the housing due to insufficient cooling capacity, there is a problem between the housing and the anode. The sealing structure is achieved by forming a protruding flange on the anode and attaching this flange to the end plate of the case from the inside of the case via a sealing material, and as the internal pressure increases due to thermal expansion, the pressing force of the flange against the end plate increases. increases, and airtightness automatically improves.

In addition to the first invention, the second invention is such that a shield is fitted around the outer periphery of the anode where a target, which is an X-ray generation point, is formed, so that leakage of X-rays can be effectively prevented with a small amount (light weight). be.

[Embodiments of the invention]

Hereinafter, the present invention will be described with reference to an illustrated embodiment. Note that the same parts as in FIG. 5 are given the same reference numerals, and similar explanations will be omitted.

In FIG. 1, reference numeral 1 denotes a cylindrical housing filled with insulating gas, and one end plate 2 of this housing 1 is formed to protrude outward perpendicular to the axis of the anode 3. One side of the flange 3a is attached to the inner surface of the flange 3a through a sealing material 4 in a surface contact state to maintain airtightness. A target 5 is obliquely provided on the inner inclined surface 3b of the anode 3. An insulator 6 as an X-ray tube is attached to the inside of the end plate 2 via the flange 3a so as to surround the opening 3c of the anode 3. A cathode 8 integral with a filament coil 7 is attached opposite the target 5. Further, an irradiation window 9 is attached to the anode 3 located on the emission optical path of the target 5, so that the X-rays emitted from the target 5 can be irradiated to the subject through the irradiation window 9. It's getting old.

On the other hand, on the outer periphery of the anode 3 that protrudes outward from the end plate 2, a shield 1 made of lead material, for example, is provided.
0 is inserted. This shield 10 is arranged on the outer wall of the anode 3 from the flange 3a to the inner part of the cone formed by /A'OB, and is arranged in a direction smaller than /A'OB from the target, that is, on the side of the housing 1. This shields X-rays from leaking into the room. Note that leakage X-rays from the inner part of the cone formed by /COC' are absorbed by increasing the transmission distance within the anode 3.

Radial heat dissipation fins 11 are provided on the outer periphery of the outwardly projecting portion of the anode 3 in surface contact with the shield 10 interposed therebetween. The heat dissipation fin has an X-ray extraction port that opens along the outer periphery of the irradiation window 9 of the anode 3 at its flange, and the fins stand up from both sides of the extraction port as shown by dotted lines in FIG. There is. A cover 12 is attached to a part of the end plate 2 on the outside of the heat radiation fin 11, and a blower 13 for heat radiation is provided on the inside surface of the cover 12. Further, a shield 14 made of lead material is attached to the inner circumferential surface of the cover 12, thereby preventing radiation leakage. That is, this shielding body 14 shields X-rays emitted from the outside of the cone of /BOA',
The shielding body 10 blocks leakage X-rays that pass through the anode 3 portion and are scattered. Further, a ring-shaped handle 17 is provided on the outside of the cover 12, and this handle 17 is also provided at the other end of the housing 1 with the cover 12 interposed therebetween.

Note that this shield 14 can be omitted in the following cases. That is, the diameter or length of the anode is increased within a range that satisfies conditions such as the tube voltage and tube current of the X-ray tube, and the X-ray transmission distance of the anode portion other than the shield 10 is increased. , the shield 14 may be omitted if the distance is sufficient to absorb leaked X-rays.

Therefore, when the X-ray apparatus according to the invention is used, even if the anode 3 holding the target 5 is heated, the heat dissipation fin 11 integrally provided on the outer circumferential anode of the target 5, the flange 3a of the anode, and the flange 3a Housing end plate 2 through which heat was conducted
can be directly forcedly cooled by the blower 13, and can be carried around without the need for a pump or piping. Moreover, when the anode 3 heats up and the insulating gas inside the housing expands thermally, the pressure inside the housing rises.
The flange 3a is pressed more against the end plate 2 of the housing 1,
The airtight effect of the sealing material 4 is improved, and the problem of gas leakage is eliminated. In addition, a flange 3 is attached to the end plate 2.
Since a is attached in surface contact, the anode 3 is firmly held, and even if the heat dissipation fins 11 and shield 10 are left unattended, it can withstand being carried around, so it can withstand some shock when the outside is exposed. However, the position of radiation generation will not shift. Further, the radiation fins 11 are opened along the outer periphery of the irradiation window and fitted therein in surface contact with each other, so that the temperature distribution on the outer periphery of the irradiation window 9 can be made uniform.

Furthermore, since the shield 10 can be placed near the target, leakage of X-rays in directions other than the desired direction can be effectively prevented with a small amount.

Next, the embodiment shown in FIG. 2 is another embodiment of the present invention, in which a cylindrical body 11a is integrally formed on the outer periphery of a radial heat dissipating fin 11, and the outer periphery of this cylindrical body 11a is A shield 15 made of lead material is provided at the top of the blower 13, which also serves as the wind head of the blower 13. Note that the design of the shield 15 can be freely changed so that it is provided on the inner circumferential surface of the cylindrical body 15, as shown by the chain line.

Next, the embodiment shown in FIG. 3 is another embodiment of the present invention, in which a shield 10 is provided on the entire outer peripheral surface of the end plate 2 except for the irradiation window 9 of the anode 3 projecting outward. Although the thermal effect is somewhat inferior, the shielding body 15 shown in FIG. 2 can be omitted, which has the effect of simplifying the structure.

Finally, the embodiment shown in FIG. 4 is yet another embodiment in which the shield 10 is
It extends to the inside of the cone formed by the AOD, and the cylindrical body 11a is provided with a shield 14 only at a portion outside of the cone.

〔Effect of the invention〕

As described above, the present invention provides an X-ray device in which an insulator is used as an X-ray tube to strengthen the X-ray tube, and the target protrudes outward from the housing to reduce absorption of soft X-rays. In addition to using a forced air cooling method to make it easily portable, the anode flange is attached to the end plate of the housing from the inside via a sealing material to prevent gas leakage due to thermal expansion of the insulating gas caused by insufficient cooling due to air cooling. This makes it possible to prevent this from happening.

Furthermore, since a shield is fitted to the anode around the target, a small amount of leakage of X-rays can be effectively prevented.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing essential parts of an X-ray apparatus according to the present invention, FIGS. 2 to 4 are views showing other embodiments of the present invention, and FIG. It is a figure showing a conventional example. 1... Housing, 2... End plate, 3... Anode, 5
... Target, 6 ... Insulator, 8 ... Cathode, 9 ... Irradiation window, 10 ... Shielding body, 11 ... Heat dissipation fin, 13 ... Blower.

Claims (1)

[Scope of Claims] 1. A casing filled with an insulating gas, and one side of a flange formed in the shape of a cylinder with a bottom and protruding outward perpendicular to the axis of the casing through a sealing material to the end of the casing. An anode that is attached to the inner surface of the plate in surface contact and whose bottom part protrudes outward and has a target and an irradiation window formed in the protruding part; and an anode that is attached to the outer periphery of the protruding part of the anode. an insulator provided on the end plate of the casing so as to surround the opening of the anode from inside the casing, and a cathode provided on the end plate of the insulator facing the target. X-ray equipment. 2 A casing filled with insulating gas, and one side of a flange formed in the shape of a cylinder with a bottom and protruding outward perpendicular to its axis is attached to the inner surface of the end plate of the casing via a sealing material. an anode that is attached in contact with the anode, the bottom of which protrudes outward, and a target and an irradiation window formed in the protruding part; and a shield fitted around the outer periphery of the protruding part of the anode. , a heat dissipation fin provided on the outer periphery of the protruding portion of the anode with a portion intervening with the shield, and an end plate of the casing so as to surround the opening of the anode from inside the casing. An X-ray apparatus comprising an insulator body and a cathode provided on an end plate of the insulator body facing the target. 3. Claims 1 or 2, characterized in that the heat dissipation fin is fitted so that the rib opening along the outer periphery of the irradiation window of the anode is in surface contact with the outer periphery of the protruding portion of the anode. X-ray equipment as described in Section. 4. Claim 1 or 2, characterized in that the radiation fin has an X-ray extraction port formed in its flange along the outer periphery of the irradiation window of the anode.
X-ray equipment as described in Section. 5. The X-ray apparatus according to claim 4, wherein the heat dissipation fins are arranged at least at positions on both sides of the X-ray extraction port. 6. The X-ray apparatus according to claim 1 or 2, wherein the insulator body is provided on the end plate of the housing via the flange of the anode. 7. The X-ray apparatus according to claim 2, wherein the shielding body is provided at a position to shield leaked X-rays emitted from the target into the housing.