JPH0782105B2 - Airtight plug for electrical penetration of radiation shielding wall - Google Patents

Description

TECHNICAL FIELD The present invention relates to a penetrating portion that is set to electrically penetrate a radiation shielding wall in a wall of an airtight container that handles a substance that emits radiation, More specifically, the present invention aims to provide an airtight plug for electrical penetration having a completely new concept in which electrical insulation can be achieved by using a resin-coated insulated electric wire made of a radiation-resistant organic insulating material.

[Prior Art; Problems to be Solved by the Invention]

Conventionally, a penetrating device provided to electrically penetrate a radiation shielding wall has been constructed based on the use of an inorganic insulated wire.

The inorganic insulated wire itself is an excellent wire with high radiation resistance, but since the inorganic insulating material (magnesium oxide powder) between the conductive core wire and the metal sheath easily absorbs moisture, it is airtight at the terminal. Therefore, it is required to perform sufficient sealing between the terminal and the terminal attached to the terminal. However, a ceramic terminal is used for such a terminal in terms of radiation resistance, and for this reason, the ceramic terminal and the inorganic insulated wire are given a predetermined sealing structure by a brazing process with silver solder. It was

The encapsulation by the silver brazing is directly reflected on the encapsulation performance depending on how the temperature is controlled during the brazing. Further, it has not been made concrete to provide a leak check function for an inorganic insulated wire including such a sealing structure.

Furthermore, the inorganic insulated wire can prevent the passage of radiation such as γ-rays, which has a high penetration ability in the wire penetration path, by offsetting and penetrating the through hole set in the radiation shielding wall. However, in order to take such an offset, it is necessary to bend the inorganic insulated wire, which is densely filled with inorganic insulating powder in the metal sheath and has poor flexibility, without impairing the electrical insulation performance. Was required, and it was difficult to obtain a predetermined offset shape.

In view of these problems of the prior art, the present invention enables the use of a resin-coated insulated wire made of an organic insulating material in place of the conventional inorganic insulated wire as an electric wire for achieving electrical penetration, and has a simple wiring workability. At the same time, a reliable airtight structure can be easily obtained. The first issue is to provide an airtight plug for penetrating the radiation shielding wall, and also to provide an airtight plug for penetrating the radiation shielding wall, which is provided with a leak monitoring means having a check function for the insulated wire itself for electric penetration. Is the second issue.

[Means for Solving the Problems]

According to the present invention, the first problem is to provide a tubular sleeve that is arranged to penetrate through the radiation shielding wall in an airtight manner, and a tubular sleeve that is passed while forming an offset in the axial direction of the sleeve and is arranged in an airtight manner via the radiation shielding material. Connected pipe, an airtight connector attached so as to close the end openings of the pipe at both ends of the pipe, and an airtight connector that is passed through the pipe and on both sides of the pipe. The present invention aims to solve the problem by including a resin-coated insulated electric wire made of the radiation-resistant organic material described above, and further enclosing an inert gas in the passage pipe.

Further, as for the second problem, a resin-coated insulated electric wire made of a radiation-resistant organic insulating material is disposed inside a tubular sleeve that is hermetically penetrated through a radiation shielding wall, and both ends are hermetically sealed. A passage pipe closed by a connector is arranged through the radiation shielding material, and the portion outside the radiation shielding wall is airtightly coupled to the end of the sleeve and the passage pipe is airtight. Achieved by providing a piercing leak monitor means, and arranging a resin-coated insulated wire made of a radiation-proof organic insulating material, which is arranged in a pipe for passage in the leak monitor means, so as to exist in the leak monitor gas. Is what you are trying to do.

〔Example〕

FIG. 1 shows a preferred embodiment of an airtight plug according to the present invention.

In the figure, reference numeral 1 designates a shielding wall of an airtight container, through which a through hole 2 for electric wire penetration is bored, and an airtight plug 3 penetratingly arranged therethrough is used for electric penetration to connect to an operating machine in the container. It is used for power supply and control signal transmission.

Therefore, the airtight plug 3 embodied by the present invention is constructed by using a conduit pipe 7 for closing the both ends with the airtight connectors 4 and 5 and wiring the resin-coated insulated electric wire 6 made of the radiation resistant organic insulating material inside. Is arranged in the tubular sleeve 8 for penetration through the radiation shielding material 9.

The tubular sleeve 8 is shaped as an outer shell by joining large and small metal ducts 8a, 8b made of a stainless steel cylinder or the like by welding 10 so that the small duct 8b shields the inside of the container and the large duct 8a. It is located outside the wall 1. This forms a step in the radial direction by joining large and small ducts and blocks the penetration of radiation such as γ-rays having a large penetrating ability along the creeping surface of the duct. A flange 8c is welded and fixed to the outer periphery of the large duct 8a, which enables welding connection with the nozzle sleeve 2a defining the inside of the through hole 2. In addition, it is advisable to stuff lead bristles between the tubular sleeve 8 and the through hole 2 which are arranged so as to penetrate, thereby improving the radiation shielding effect.

The conduit pipe 7 is obtained by using a stainless steel round pipe, a square pipe, or the like, and is formed by forming an offset 7a by bending in the middle of the axial direction. A support 11 is provided before and after the offset 7a. , 12 are attached respectively.
Therefore, the conduit pipe is positioned and supported in the tubular sleeve 8 by the supports 11 and 12 after it is inserted into the tubular sleeve 8.

The radiation shielding material 9 packed between the tubular sleeve 8 and the passage pipe 7 penetratingly arranged as described above is γ
Using a combination of lead particles that have a large shielding effect against radiation with high penetrating ability such as wires and steel powder with excellent heat resistance, a through hole is drilled in the support between the supports 11 and 12, and the support is separated from it. To fill the empty space. After filling, the through hole may be closed.

Reference numeral 13 is an end plate which is fitted to the open end of the small duct 8b in a fitting manner to cover the end surface of the radiation shielding material 9.

The pipe 7 for passing the wire, which is penetratingly arranged as described above, is longer than the length of the tubular sleeve 8, and one end of the pipe 7 penetrates the end plate 13 and is projected to the inside of the shielding wall 1. Together, the other end projects from the end of the large duct 8a,
It is projected to the outside of the shield wall 1. Airtight connectors 4 and 5 each having a structure in which terminals are sealed with ceramics and housed in a metal body are attached to the protruding ends of the pipes by welding the metal bodies to the edges of the pipe. It is attached airtight so that the opening is closed. Therefore, the passage pipe 7 forms the first and second radiation shielding walls by sealing the end portions with the airtight connectors 4 and 5, and the radiation 7 (γ
(Line) and the like are prevented from penetrating in the axial direction.

As the insulated wire 6 that is passed through the conduit 7 as an element for electrical penetration, a resin-coated insulated wire made of a radiation-resistant organic insulating material such as polyetheretherketone is used. An offset is additionally formed along the offset 7a in the pipe for passage, and the pipe is passed. Therefore, it is not necessary to bend the wire itself. The electric wire 6 passed in this way is connected to the airtight connectors 4 and 5 that close both ends of the pipe,
The shield wall 1 is electrically penetrated in and out. In this way, the machine inside the container is equipped with one airtight connector 4
Is used, and the other airtight connector 5 is used for connection with an external device.

As is clear from the above description, the resin-coated insulated electric wire 6
It will be easily understood that it is practical to pre-wire the wire in the wire pipe 7 before the airtight connectors 4 and 5 are attached. In that case, the electric wire 6 run through the pipe 7 is drawn out from the end of the pipe to be connected to the airtight connectors 4 and 5 that cannot be attached yet, and the electric wire drawn out thereafter is pushed back into the pipe to form the airtight connector. 4 and 5 are airtightly attached with the above-mentioned capacity.
Therefore, it is preferable that the electric wire 6 has a length with a sufficient margin compared with the length of the passage pipe 7.

An inert gas such as nitrogen gas is enclosed in the pipe 7 for passing the resin-coated insulated electric wire 6 as described above,
The insulated electric wire 6 that has been passed is always disposed in the presence of the inert gas.

Polyetheretherketone as radiation resistant organic insulating material, the mechanical properties in the state that received γ-irradiation (tensile, elongation) are those affecting, in the air 10 ⁹ R
The characteristics have dropped significantly due to gamma irradiation of ad. On the other hand, in the nitrogen gas atmosphere, the characteristics were not significantly deteriorated even when 10 ¹⁰ Rad γ-ray irradiation was added.

The present invention is based on the above findings, and the resin-coated insulated wire 6 made of a radiation-resistant organic insulating material is placed in the presence of an inert gas atmosphere.

As a radiation resistant organic insulating material that does not exhibit physical property deterioration as a coating material for electric wires used under severe conditions as described above, in addition to the above polyether ether ketone, polyimide, polyether imide are found, It would be possible to consider the use of resin-coated insulated wires made of such a material.

In the above-described penetrating structure, a leak monitor 14 is added to perform a leak check.

The leak monitor means 14 is hermetically coupled to the end of the large duct 8a of the tubular sleeve 8 by welding, and the short pipe 15 coaxially arranged with respect to the extended projecting portion of the conduit pipe 7 is removed. As a shell, a first header plate 16 and a second header plate 17, which are sealed by welding or the like with a space left between them, are provided as shells, and a pipe for wire passage to these header plates 16 and 17 is provided. The extended projecting part of 7 is penetrated. Airtightness is maintained at the penetrating portion by welding or the like.

Therefore, the space 18 including the conduit 7 between the first header plate 16 and the second header plate 17 serves as a leak monitor chamber.

In the portion of the conduit 7 exposed in the space 18,
A hole 7b passing through the wall is formed, and the short pipe 15 has a pipe 19 that opens to the space 18, to which a pressure gauge 20 and a valve 21 used for leak monitor gas supply and the like are attached. I am allowed.

Generally, the leak monitor gas is an inert gas,
Therefore, by sending this into the leak monitor chamber 18 as nitrogen gas and sending it into the conduit pipe 7 through the through hole 7b, a leak check inside the tubular sleeve 8 and a conductor leak to the resin-coated insulated wire 6 are performed. It can be used both for checking and for creating an atmosphere for improving the radiation resistance to the coating of the radiation resistant organic insulating material.

The airtight plug 3 including the above-mentioned elements can be assembled in advance in a manufacturing factory by using the tubular sleeve 8 as a container and supplied as a unit to the site of use. In this case, the tubular sleeve 8 can be disposed through the through hole 2 of the shielding wall 14 and the predetermined assembly can be performed only by welding the flange 8c to the nozzle sleeve 2a.

In the above-described embodiment, the radiation-shielding material is filled in the conduit 7 after passing through the resin-coated insulated wire 6 to improve the radiation shielding performance for the conduit 7. It is possible.

On the other hand, the airtight connection between the airtight connector and the conduit pipe is
In addition to welding, mechanical connection by tightening packing and cap nut can also be used.

Further, as for the airtight connection between the respective members in the leak monitoring means, the use of mechanical connection can be considered similarly.

Furthermore, the connection between the airtight connector and the resin-coated electric wire can be done by attaching a contact pin or socket contact to the conductor end of the resin-coated electric wire, and then inserting this into the socket contact or contact pin on the connector side to insert it. Very easy to do. In that case, the insulation treatment between the contact pin or socket contact and the wire end is performed by a simple tape winding treatment because these are placed under an inert gas atmosphere in the pipe for wire passage.
This can be done by mounting the tube, filling the resin, etc.

Further, it is advantageous in terms of sealing that each header plate as the leak monitoring means has a laminated structure in which a plurality of metal plates are stacked with a sealing material such as epoxy resin interposed therebetween.

FIG. 2 shows a second embodiment of the airtight plug according to the present invention, and common portions in FIG. 1 have the same reference numerals as those in FIG.

In this embodiment, in addition to the airtight connectors 4 and 5 attached to both ends of the passage pipe 7, a third airtight connector 30 is provided between them. As a method of mounting the third airtight connector 30, the two divided pipes 7 ₁ and 7 ₂ for passage are made to face each other in the axial direction and are interposed between them, and the respective pipes 7 ₁ and 7 ₂ may be hermetically joined by welding or the like.

Wire 6 is passed through the wire-passing pipe within 7 has one airtight connector 4 and the wire ₆₁ are wired between the third hermetic connector 30, other gas-tight connector 5 and the third are as establishing electrical penetration as a series of ones by the wire 6 ₂ are wired between the hermetic connector 30.

In this way, in addition to the airtight connectors at both ends, the third airtight connector is closed to form multiple radiation barriers and airtight walls for the passage pipe, thereby providing a safer airtight plug. Can be provided as.

[Action]

According to the airtight plug for electrical penetration of the shielding wall having the first feature, the pipe for passage having the offset is disposed in the tubular sleeve, and the resin-coated insulated electric wire is simply passed through the pipe for passage. Since the wire can be pierced, the wire can be pierced with an offset in consideration of radiation penetration only by passing the wire without further bending.

Further, since both ends of the pipe for passage are sealed by the airtight connector, the airtight connector serves as a barrier against radiation, and the radiation shielding at the wire penetration portion can be reduced accordingly.

Further, the resin-coated insulated wire is a coating made of a radiation-resistant organic insulating material, and since it is placed in the presence of an inert gas enclosed in the pipe passing through it, it has a high level of radiation and high heat. It is possible to maintain stable insulation performance without deterioration due to the presence of

By the way, according to the one which adopted polyetheretherketone as the radiation resistant organic insulating material and made it a resin coating, and enclosing the resin coated insulated wire thus obtained in nitrogen gas, It was confirmed that stable insulation performance that can withstand a high level of radiation on the order of ¹⁰ Rad was obtained.

Since the resin-coated insulated electric wire is used as described above and the wire is connected to the airtight connector which is hermetically attached to the end of the conduit pipe, the sealing structure between the insulated electric wire and the airtight connector is unnecessary. be able to.

On the other hand, according to the second feature, in the leak monitor means that penetrates the conduit pipe and is hermetically coupled to the end portion of the tubular sleeve, the resin-coated insulated wire that has penetrated into the conduit pipe leaks. Since it is placed in the presence of the monitor gas, not only the airtightness test in the tubular sleeve but also the leaktightness in the conductor portion of the resin-coated insulated electric wire can be performed together with the airtightness test in the conduit pipe.

〔The invention's effect〕

According to the airtight plug for electrical penetration of the radiation shielding wall of the present invention having the above-described configuration and operation, as the electric wire for achieving electrical penetration, a resin made of an organic insulating material is used instead of the conventional inorganic insulated electric wire. A covered insulated wire can be used, and a reliable airtight structure can be easily obtained with a simple wiring workability. It is possible to provide an airtight plug for penetrating the radiation shielding wall and also to provide an airtight plug for penetrating the radiation shielding wall, which is provided with a leak monitor means having a check function of the insulated wire itself for electric penetration. The purpose of the period is fully achieved, and the practical effect is quite large.

[Brief description of drawings]

FIG. 1 is an explanatory view in which a first embodiment of an airtight plug for electrical penetration of a radiation shielding wall according to the present invention is partially shown in section.
FIG. 2 is an explanatory view showing a second embodiment of the airtight plug for electrically penetrating the radiation shielding wall according to the present invention in a partially sectional view. In the figure, 1 is a radiation shielding wall, 2 is a through hole, 2a is a nozzle sleeve, 3 is an airtight plug, 4,5 and 30 are airtight connectors, 6 is a resin-coated insulated wire made of a radiation resistant organic insulating material, and 7 is A pipe for passage, 8 is a tubular sleeve, 9 is a radiation shielding material, and 14 is a leak monitoring means.

 ─────────────────────────────────────────────────── --- Continuation of the front page (72) Inventor Hiroshi Kogure 5-1-1 Hidaka-cho, Hitachi-shi, Ibaraki Hitachi Cable Co., Ltd. Hidaka factory (56) Reference JP-A-57-52310 (JP, A) JP 61-273115 (JP, A) JP 62-244210 (JP, A) JP 63-167295 (JP, A) JP 61-142914 (JP, A)

Claims (4)

[Claims] 1. A tubular sleeve to be penetrated through a radiation shielding wall, a conduit pipe which is provided with an offset in the axial direction of the sleeve and which is disposed via a radiation shielding material, and a conduit pipe. An airtight connector attached so as to close the end openings of the pipe at both ends, and a resin-coated insulated electric wire made of a radiation-resistant organic material that is passed through the conduit pipe and is connected to the airtight connectors on both sides. An airtight plug for electrical penetration of a radiation shielding wall, characterized in that an inert gas is enclosed in the passage pipe. 2. A conductor for a wire which is provided with a resin-coated insulated wire made of a radiation-resistant organic insulating material inside a tubular sleeve which is hermetically penetrated through a radiation shielding wall and whose both ends are closed by airtight connectors. The pipe is arranged so as to penetrate through the radiation shielding material, and the portion outside the radiation shielding wall is equipped with a leak monitor means that is airtightly coupled to the end of the sleeve and that penetrates the passage pipe airtightly. A radiation shielding wall for electrical penetration, wherein a resin-coated insulated wire made of a radiation-proof organic insulating material disposed in the conduit for the leak monitoring means is disposed so as to be present in the leak monitoring gas. Airtight plug. 3. The airtight plug according to claim 2, wherein the inert gas sealed in the line pipe and the inert gas as the leak monitor gas are used in common. 4. The airtight plug according to claim 1 or 2, wherein the wire pipe itself is provided with a third airtight connector between them in addition to airtight connectors attached to both ends.