JPH063751B2 - Radiation resistant airtight electrical connector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to radiation resistance applied to a penetrating portion formed in a cell wall or a radiation shielding wall for the purpose of electrically penetrating an airtight container or the like in a nuclear facility. Airtight electrical connector.

[Conventional technology]

Generally, the wall penetration part in a nuclear facility is required to have a high level of radiation resistance property and airtight property.
In the conventionally provided airtight electrical connector of this type, a large number of metal rod-shaped conductive connecting members are arranged in a cylindrical metal body, and the conductive connecting members are connected to each other and between the members and the metal body. Has been airtightly integrated with a ceramic seal and a glass hermetic seal that have both airtight sealability and electrical insulation.

[Problems to be Solved by the Invention]

However, according to the ceramic seal or the glass hermetic seal as described above, the metal body and the conductive connecting member are kept airtight while keeping the same thermal expansion coefficient of the seal integrated with the metal body and nickel-iron alloy or Manufactured from materials such as nickel-cobalt-iron alloy,
In such a limited metal material, not only is it easily corroded in a corrosive atmosphere containing an acid etc., but it also becomes a magnetic substance, which causes iron loss when a current is applied, resulting in low conductivity. Together with this, the current capacity was kept small.

Further, in such a ceramic seal, a metallized ceramic substrate is brazed to a metal body and a conductive connecting member by silver brazing or the like, so that predetermined airtight integration is measured, and therefore, acid or the like is contained. However, it was attacked in a corrosive atmosphere and its application range was limited.

In addition, the above-mentioned seal has a problem of high cost.

The present invention has been made in view of the above problems, and has both high radiation resistance and airtightness without being corroded in a corrosive atmosphere and without being restricted by current capacity. The present invention aims to provide a radiation resistant airtight electrical connector at low cost.

[Means / actions for solving problems]

In order to solve the above-mentioned problems, the radiation resistant airtight electrical connector of the present invention comprises a cylindrical metal body, a metal rod-shaped conductive connecting member to be arranged in a large number therein, and an airtight seal interposed between them. An airtight connector provided with an insulating / sealing member to be integrated, wherein an inner surface portion of the metal body has a convex step portion processed by itself, and an outer surface portion of the conductive connecting member has A surface having an outer diameter increasing portion by its own processing, wherein the insulating / sealing member directly casts a radiation resistant organic material into the metal body to thereby include a convex step portion in the metal body. And the surface of the outer diameter-increased portion of the conductive connecting member are integrally joined and molded.

Radiation resistant organic materials are polyphenylene sulfide,
It is selected from polyetheretherketone, polyimide, polyetherimide, and phenolic resin containing glass fiber. These materials have no practical problem even when the radiation dose is up to 1000 Mrad, and the resistance required for this type of connector is high. It can be adapted to radiation.

The radiation-resistant organic material as described above has excellent moldability and can be easily cast into a complicated intricate gap by a transfer molding method.Therefore, this can be directly cast into a cylindrical metal body. By molding into a predetermined insulation / sealing member, the radiation-resistant organic material enters into every corner of the metal hoddy and is filled with gaps at the time of casting, and it is airtightly engaged with the metal body and the conductive connecting member. Can be integrated. And, since the material casting surface on the inner surface of the metal body has a convex step and the material casting surface of the conductive connecting member has an outer diameter increasing portion, the casting material is bonded. The surface area is increased and the bond strength with the casting material is enhanced. Therefore, a sufficient boundary (anchor effect) to counter high pressure can be obtained in the electrical penetration part of the shielding wall of the airtight container that requires pressure sealing, and a process such as a harmful brazing process that may cause corrosion progress. The desired bond strength can be obtained without the need for.

The surface of the metal body, which is the casting surface of the radiation-resistant organic material, including the convex step portion and the surface of the outer diameter increasing portion of the conductive connecting member are roughened by sandblasting, etc. It is also possible to further improve the bond strength of the and further improve the anchor effect.

As mentioned above, since the radiation-resistant organic material is used for the insulating / sealing member and this is molded by casting, the metal body and the conductive connecting member which are in a binding relation to it are
It is not necessary to impose the disadvantageous condition of using an iron-based alloy of a metallic material having a practical problem as in the conventional case, and a non-magnetic metallic material that is a preferable material for energization can be used. In addition, since the convex stepped portion in the metal body and the outer diameter increasing portion of the conductive connecting member are integrated with the metal body or the conductive connecting member which is the support base for them, the airtightness is impaired or corrosion occurs. The factor of will not be created.

The axial length of the outer diameter increasing portion of the conductive connecting member is made larger than that of the convex step in the metal body, and the insulating / sealing member made of a radiation resistant organic material is used in the axial direction of the outer diameter increasing portion. By providing the length corresponding to the length, the convex step portion can be completely embedded in the casting material, and the bonding force between the metal body and the insulating / sealing member can be further strengthened.

Since the insulating / sealing member formed by casting the radiation-resistant organic material is provided corresponding to the axial length of the outer diameter increasing portion of the conductive connecting member, both axial end surfaces of the insulating / sealing member are provided. Also, by providing an additional seal on the axially opposite end steps of the outer diameter increasing portion, insulation and insulation between the conductive connecting member and
To make the airtightness of the sealing member in the axial direction more complete.

〔Example〕

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

FIG. 1 shows an embodiment of a radiation-proof airtight electrical connector according to the present invention, and exemplifies a receptacle into which plugs are inserted from both sides.

In this embodiment, the insulating / sealing member 1 is made of glass phenolic as a glass fiber phenolic resin (a product of Rogers Corporation in the United States, model number “RX-6
30 ”is adopted.

In addition, the example body 2 is made of stainless steel, which is a non-magnetic material, specifically, SUS 304.

Furthermore, the conductive connecting member 3 is made of brass, which is also a non-magnetic material and has high conductivity.

By the way, in the metal body 2, a convex bank 21 is formed at the center of the outer surface of the cylindrical body to set a mounting margin for a living body shielding wall, etc. A plug (not shown) 22 is formed as a receiving portion. Further, a ring-shaped convex step portion 23 is formed in the center of the inner surface. These respective parts are integrated by cutting the stainless steel pipe material from the inner and outer surfaces, so as not to have a corrosion-promoting part due to brazing of members, which is conventionally performed.

The conductive connecting member 3 is formed by processing a solid brass rod to form the contact pin portions 31 and 31 at both ends and the outer diameter increasing portion 32 at the center. It is made to have no corrosion-promoting part by attachment. Surfaces of the contact pin portions 31 on both sides are plated with gold to improve electrical contact with the contacts of the plug.

Only one conductive connecting member 3 is shown in the figure, but in reality, a large number (48 when the metal body outer diameter is φ53).
Are housed in the metal body 2 so as to be separated from each other. Therefore, the insulating / sealing member 1 to be described later is interposed between the plurality of conductive connecting members and between the conductive connecting member and the metal body which are arranged around the outer periphery of the conductive connecting members, so that electrical insulation and airtight sealing are achieved.

The insulating / sealing member 1 is formed by pelletizing glass fiber-filled phenolic resin as a radiation resistant organic material in a molten state by a transfer molding method and is a metal body 2
By casting into the metal conducting body 2, the electric connecting member 3 set by using a jig in the conductive metal body 2 and the metal body 2 are airtightly coupled and injected into every corner between them. Are integrally molded.

In relation to the insulating / sealing member 1, the outer diameter increasing portion 32 of the conductive connecting member 3 has a larger axial length than the convex step portion 23 in the metal body 2, and the radiation resistance is high. An insulating / sealing member 1 formed by casting a glass fiber-containing phenolic resin, which is an organic material, is provided with a length corresponding to the axial length of the outer diameter increasing portion 32. In that case, a rough surface treatment 33 by sandblasting is applied to the surface of the outer diameter increasing portion 32 serving as a material casting surface in advance, and also, the convex step portion 23 and the material casting surface are provided. Rough surface treatment by sandblasting on the surface in the vicinity 2
4 is added and the casting material is made into those roughened parts 33, 2
It is in close contact with 4 and is firmly integrated.

By doing so, the internal convex step 23 of the metal body 2
Is completely embedded in the cast insulating / sealing member 1 and has a locking force capable of resisting a high axial pressure between the insulating / sealing member 1 and the metal body 2. You can Further, since the conductive connecting member 3 itself is a thin rod, it cannot be said that the bonding area with respect to the casting material is sufficient as it is, but as in the present embodiment, the length in the axial direction with respect to the convex step is increased. Since the connection with the casting material is achieved on the increased surface of the increased outer diameter increasing portion 32, even the insulating / sealing member 1 and the conductive connecting member 3 can be locked to withstand high axial pressure. Can have power

Further, in this embodiment, a preliminary sealing process 4 and a sealing substrate 5 are applied as additional sealing processes before and after the insulating / sealing member 1 in the axial direction. The preliminary sealing process 4 is performed by using an insulating mixture of epoxy resin, phenol resin, polyether ether ketone, polyimide resin, etc. as a material, the front and rear surfaces of the insulating / sealing member 1, the inner surface of the metal body 2 side, and conductive connection. The outer diameter changing portion at both ends in the axial direction of the member 1 side outer increasing portion 32, that is, the step portion and the outer surface continuous with the step portion are provided without unevenness.
The sealing substrate 5, which is the final sealing material, is preferably a molded body of polyamide resin, is a disk having an outer diameter equal to the inner diameter of the metal body 2, and has a hole through which the contact pin portion 31 of the conductive connecting member 3 can penetrate. What is drilled is embedded so as to circumscribe the preliminary sealing process 4.

As described above, the additional treatments 4 and 5 are such that the connecting portion between the conductive connecting member 3 and the insulating / sealing member 1 becomes straight in the axial direction, so that the conductive connecting member 3 may be pulled out by any chance. It eliminates anxiety and can withstand severe insertion / extraction of the connector on the contact pin portion 31. At the same time, double sealing is provided on the boundary between both axial ends of the axially straight coupling portion, so that acidity is prevented. It becomes a sufficient airtight barrier against the corrosive atmosphere shown.

In this embodiment, the contact pin portions 3 are provided on both ends.
1 is provided, the contact pin portion may be provided only on one side.

〔The invention's effect〕

As described above, according to the radiation-proof airtight type electrical connector of the present invention, the radiation-resistant organic material is used as the insulating / sealing member and is cast in the cylindrical metal body to achieve insulation. · Forming as a sealing member and achieving integral airtight connection with the metal body and the conductive connecting member of the member, so problems such as ceramic materials conventionally used as radiation resistant sealing materials The troublesome additional processing (such as brazing)
By utilizing the excellent moldability of the radiation-resistant organic material, it is easy to integrate airtightly into the metal body and the conductive connecting member, and mass production is possible and cost reduction is achieved. Can be achieved.

An iron-based alloy that is a magnetic substance that is corrosive to the metal body and the conductive connection member due to the coefficient of thermal expansion, which has been a problem by providing radiation resistance with a ceramic material as in the past. There is no restriction that you have to use, and you can choose a metal with excellent corrosion resistance.Also, you can choose a non-magnetic material with excellent conductivity for the conductive connecting member, so in a corrosive atmosphere, especially in an acidic atmosphere. It can also be applied, and there is no restriction on the current capacity due to heat generation, and it is possible to cope with large capacity.

The metal body is provided with a convex step portion by its own processing, and the conductive connecting member is provided with an outer diameter increasing portion by its own processing to form a casting surface of a radiation resistant organic material as an insulating / sealing member. Therefore, it is possible to strengthen the air-tight coupling with the casting material after eliminating the brazing process and the like that cause the progress of corrosiveness.

An insulating / sealing member made by casting a radiation-resistant organic material is provided for the axial length of the outer diameter increasing portion of the conductive connecting member, and both axial end surfaces of the insulating / sealing member and the shaft of the outer diameter increasing portion. Since additional seals are applied to both end portions in the direction, the connecting portion between the electrically conductive connecting member 3 and the insulating / sealing member 1 becomes straight in the axial direction, so that the electrically conductive connecting member 3 should be protected. Since it is possible to eliminate the anxiety of coming off and to withstand the severe insertion and removal of the connector on the contact pin portion 31, as well as double sealing on the boundary between both axial ends of the axially straight coupling portion. , It becomes a sufficient airtight barrier against corrosive atmosphere showing acidity.

The radiation-resistant airtight electrical connector that has both high radiation resistance and airtightness without being damaged in a corrosive atmosphere and is not restricted by the current capacity, at a low cost. The purpose of the above is sufficiently achieved, and it is also practically used in nuclear facilities, especially in airtight containers that have a severe corrosive atmosphere (acidic etc.) and require a sufficient boundary (anchor effect) for high pressure. It is possible to provide this kind of electrical connector without problems.

[Brief description of drawings]

FIG. 1 is a cross-sectional explanatory view showing an embodiment of a radiation resistant airtight electrical connector according to the present invention. In the reference numeral, 1 is an insulating / sealing member (made by casting a radiation resistant organic material), 2 is a metal body, 3 is a conductive connecting member, 4 is a preliminary sealing material, 5 is a sealing substrate, 6 Is an additional seal treatment, 11 is a roughening treatment by sandblasting, 21 is a convex bank, 22 is a coupling part, and 23
Is a convex step, 24 is a surface roughening treatment by sandblasting, 3
Reference numeral 1 is a contact pin portion, 32 is an outer diameter increasing portion, and 33 is a roughening treatment by sandblasting.

Claims (1)

[Claims] 1. An airtight connector comprising a tubular metal body, a metal rod-shaped conductive connecting member arranged in a large number therein, and an insulating / sealing member interposed between them for airtight integration. In addition, the inner surface portion of the metal body has a convex step portion by its own processing, and the outer surface portion of the conductive connecting member has an outer diameter increasing portion by its own processing, The insulating / sealing member directly casts a radiation resistant organic material into the metal body to form a surface including a convex step in the metal body and a surface of the outer diameter increasing portion of the conductive connecting member. Is formed by integrally air-tightly coupling to the metal, and the axial length of the outer diameter increasing portion of the conductive connecting member is larger than that of the convex step in the metal body, For insulation and sealing by casting By providing the material for the axial length of the outer diameter increasing portion of the conductive connecting member, the convex step portion is completely embedded in the casting material, and both axial end surface portions of the insulating / sealing member and A radiation resistant airtight electrical connector, characterized in that an additional seal is further provided on both axial end portions of the outer diameter increasing portion.