JPH0355926Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an explosion-proof adapter for a thick-wall penetrating optical connector used in an explosion-proof optical transceiver or the like.

[Prior Art] FIG. 2 is an explanatory diagram showing a conventional optical connector adapter. In the figure, 7 is an optical connector, 1 is a connector plug that fixes the optical fiber 2, 4 is a tightening nut, and 3 is an adapter.The optical connector 7 is attached to the adapter 3, and the adapter 3 is attached to the thin wall 5. It was fixed with bolt 6.

[Problems to be solved by the invention] However, the conventional adapter 3 was developed for relatively thin wall surfaces, and it cannot be used for explosion-proof equipment, etc.
It was difficult to install it on such thick walls. Furthermore, there was a problem that the structure could not meet the so-called explosion-proof standards because the inside of the casing was not explosion-proof and the structure was not designed to prevent the effects of fire from reaching the outside.

[Object of the invention] In view of the problems of the prior art described above, an object of the invention is to provide an explosion-proof adapter for an optical connector that can be attached to a thick wall and can meet explosion-proof standards.

[Summary of the invention] The present invention is an optical connector that is attached to a thick wall surface, and has optical fibers located on one side and the other side of the thick wall, respectively, at the ends of the optical fibers. In the adapter for optical connection through the connector housing, the connector housing includes a flange-shaped portion for contacting the thick wall and fixing with a bolt, and a threaded portion for screwing and fitting into the thick wall on the circumference;
A focusing rod lens located inside the connector housing and provided between both optical connector fixing portions to which the optical connector is attached; and ceramics located at both ends of the focusing rod lens for fixedly supporting the focusing rod lens. A precision bushing made of a synthetic resin, a resin filled in the gap between the focusing rod lens and the connector housing, and the connector housing on the side opposite to the side forming the flange-shaped portion of the connector housing that is inside the device where the explosion occurs. The main feature is that a fixing plate is bolted to the surface of the optical connector and has an optical connector fixing part therein.

[Example] Hereinafter, an example of the present invention will be described in detail based on the drawings.

FIG. 1 is an explanatory diagram showing an embodiment of the present invention. In the figure, 12 is a connector housing, and is provided with an optical connector fixing part 14 for mounting an optical connector. On the opposite side of this optical connector fixing part 14, a fixing plate 15 having an optical connector fixing part 24 for attaching another optical connector is fixed with bolts 16, and the fixing plate 15 side can explode. It is located inside a device with sexual characteristics. A focusing rod lens 10 having a length that is an integral multiple of the characteristic wavelength pitch is fixed by a resin 13 filled in a gap 20 of the connector housing 12, and both ends of the lens are fixed by a resin 13 filled in a gap 20 of the connector housing 12. It is supported and fixed by a precision bushing 211 and a precision bushing 111 made of ceramics attached to the fixing plate 15. The ceramic precision bushings 111 and 211 must be processed so that the optical fiber core of the optical connector and the center of the focusing rod lens 10 are hardly deviated from each other.

In this way, by providing the converging rod lens 10 between the optical connectors with the number of characteristic wavelength pitches selected according to the thickness of the wall, optical connection with low loss is possible. Furthermore, if the focusing rod lens 10 is fixed only with the resin 13, it will take a very long time to adjust the alignment, and the strength will be incomplete. This eliminates the need for this structure, and it is possible to provide such high strength that there is no axis shift or external impact even when subjected to vibrations, explosions, etc. Therefore, it becomes possible to satisfy explosion-proof standards.

The connector housing 12, which has a threaded portion 17 formed on its circumference, is screwed into the thick wall 19.
The connector housing 12 itself functions as a large screw. Therefore, the structure is extremely strong against blast waves from either the inside or the outside of the device. Further, an asbestos packing 21 is interposed between the collar-shaped portion of the connector housing 12 and the thick wall 19, and by bringing the bolt 18 into contact with the thick wall 17, the rotation of the connector housing 12 is prevented. This prevents the connector housing 12 from coming off the thick wall 19.

Note that there is no problem in using an optical fiber rod instead of the focusing rod lens 12, and by using a radiation-resistant optical fiber rod,
It can also be used for optical penetration in nuclear reactors, etc.

[Effects of the Invention] As explained in detail above, the explosion-proof adapter for optical connectors of the present invention provides the following remarkable effects.

(1) By providing a rod lens between the optical connector fixing parts, it is possible to install it on thick walls without increasing optical connection loss.

(2) By supporting and fixing both ends of the rod lens using precision bushings made of ceramics, there is no need for alignment, and the lens has excellent mechanical strength, making it possible to meet explosion-proof standards.

(3) By adopting a connector housing with a flange-shaped part for abutting against a thick wall and fixing it with bolts, and a threaded part on the circumference for screwing and fitting into the thick wall, Since the joint surface between the connector housing screwed into the wall and the thick wall can be made wider (the connector housing itself functions as a large screw), the strength against external forces is increased accordingly, making it more resistant to blast waves. The structure will be sufficiently durable. Therefore, it is no longer necessary to provide a flange on the connector housing surface inside the device to prevent the connector housing from popping out from the thick wall surface due to blast waves. , it becomes sufficient to provide a flange only on the outer surface of the connector housing of the device and secure it by tightening bolts. As a result, attachment to thick walls only needs to be done from outside the device, improving work efficiency.

(4) By providing a fixing plate on the inside surface of the device where an explosion occurs, the force of the blast when an explosion occurs is applied to the surface that is in contact with the connector housing. When it scatters outside, the problem disappears. (If the direction of this adapter is reversed and the side with the brim-shaped part of the connector housing is the explosion side, the blast wave will pass through the optical connector fixing part and pressure will be applied from the inside of the fixing plate, and all of that pressure will be Since it is applied only to the bolt, there is a risk that the fixing plate will fly off along with the focusing rod lens, precision bushing, and resin inside the connector housing due to a defective bolt or a limit to the tightening force of the bolt.)

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing an embodiment of the present invention, and FIG. 2 is an explanatory diagram showing a conventional example. 1... Connector plug, 2... Optical fiber, 3
...adapter, 4 ... tightening nut, 5 ... thin wall, 6, 16, 18 ... bolt, 7 ... optical connector, 10 ... focusing rod lens, 12 ... connector housing, 13 ... resin, 14, 24...
Optical connector fixing part, 15...Fixing plate, 17...Screw part, 19...Thick wall, 20...Gap part, 21...
...Asbestos packing, 111,211...Precision bushing.

Claims (1)

[Scope of utility model registration request] The above adapter is attached to a thick wall and optically connects optical fibers located on one side and the other side of the thick wall via an optical connector provided at the end of the optical fiber. a connector housing having a flange-shaped portion on its circumference for abutting against a thick wall and fixing with a bolt; and a threaded portion for screwing into the thick wall; A focusing rod lens provided between both optical connector fixing parts to which the optical connector is attached, precision bushings made of ceramics located at both ends of the focusing rod lens for fixedly supporting the focusing rod lens, and the focusing rod lens. A resin is filled in the gap between the rod lens and the connector housing, and the resin is bolted and fixed to the surface of the connector housing that is inside the device where the explosion occurs and is opposite to the side that forms the collar-shaped portion of the connector housing. An explosion-proof adapter for an optical connector, comprising: a fixing plate having an optical connector fixing part; and a fixing plate having an optical connector fixing part.