CN-122007625-A - Optical fiber transmission assembly for underwater laser welding of nuclear power station reactor

CN122007625ACN 122007625 ACN122007625 ACN 122007625ACN-122007625-A

Abstract

The invention discloses an optical fiber transmission assembly for underwater laser welding of a nuclear power station reactor, which relates to the technical field of maintenance of nuclear power station equipment and comprises an optical fiber output assembly with an optical fiber connector at one end, a laser optical fiber with one end welded with the end part of the optical fiber connector, a radiation-resistant composite structure radiation-resistant protection sleeve sleeved outside the laser optical fiber and provided with a sealing connector close to the end part of the optical fiber output assembly, a connector sleeved outside the optical fiber connector and used for being in sealing connection with the sealing connector, an annular elastic sealing element sleeved on the optical fiber connector and positioned in the connector, and a waterproof sealing agent filled in an annular gap between one end of the connector, which is far away from the sealing connector, and the optical fiber connector, wherein the connector in a state of being connected with the sealing connector can apply axial compression load to the annular elastic sealing element, so that the annular elastic sealing element is forced to elastically deform and form sealing tightly against the outer surface of the optical fiber connector and the inner surface of the connector. It can realize high radiation protection and high water pressure sealing.

Inventors

WANG CHUNMING
LI JUNYE
ZHENG SHUYE

Assignees

华中科技大学

Dates

Publication Date: 20260512
Application Date: 20260414

Claims (10)

1. An optical fiber transmission assembly for underwater laser welding of a nuclear power station reactor, comprising: an optical fiber output assembly having an optical fiber connector at one end; a laser fiber having one end fused to an end of the fiber optic connector; The radiation-resistant protective sleeve is of a radiation-resistant composite structure and sleeved on the outer side of the laser optical fiber, and a sealing joint is arranged at the end part of the radiation-resistant protective sleeve, which is close to the optical fiber output assembly; The connector is sleeved outside the optical fiber connector and is used for being connected with the sealing connector in a sealing way; The connector in the state of being connected with the sealing joint can apply axial compression load to the annular elastic sealing element so as to force the annular elastic sealing element to elastically deform and cling to the outer surface of the optical fiber joint and the inner surface of the connector; and the waterproof sealant is filled in a circumferential gap between one end of the connector, which is far away from the sealing connector, and the optical fiber connector.
2. The optical fiber transmission assembly for nuclear power plant reactor underwater laser welding of claim 1 further comprising a profiling protection fixture; the profiling protection clamp comprises at least two clamp bodies which can be spliced, wherein a first limiting cavity, a connecting cavity and a second limiting cavity are sequentially arranged in an internal cavity after the clamp bodies are spliced; the first limiting cavity can accommodate an integral connecting structure of the connector and the sealing connector, the second limiting cavity can accommodate an outer protruding structure on the optical fiber output assembly, and the inner diameters of the first limiting cavity and the second limiting cavity are different from the inner diameter of the connecting cavity.
3. The optical fiber transmission assembly for underwater laser welding of a nuclear power station reactor according to claim 1, wherein a limit part and an external thread section are arranged at one end of the sealing joint, which is close to the connector, and the external thread section is fixedly connected with the limit part; The internal threaded hole of the connector is in threaded connection with the external threaded section, and the external threaded section is sleeved with a sealing rubber gasket.
4. The optical fiber transmission assembly for underwater laser welding of a nuclear power station reactor according to claim 1, wherein the radiation-resistant protective sleeve comprises an inner metal protective tube and an outer radiation-resistant polymer protective layer, the outer radiation-resistant polymer protective layer is tightly attached to the inner metal protective tube, and the inner metal protective tube is of a bendable corrugated tubular structure.
5. The assembly of claim 2, wherein the clamps are fixedly connected by a plurality of fasteners, the fasteners being disposed through corresponding connecting portions of the clamps.
6. The optical fiber transmission assembly for nuclear power plant reactor underwater laser welding of claim 1, wherein the laser optical fiber is a step-type optical fiber with a cladding made of fluorine-doped quartz material and an inner core made of pure silicon core material.
7. The optical fiber transmission assembly for underwater laser welding of nuclear power plant reactor according to claim 1, wherein the connector is a stainless steel waterproof explosion-proof sealing gram head with internal threads.
8. The optical fiber transmission assembly for nuclear power station reactor underwater laser welding of claim 1, wherein the annular elastic sealing member is made of ethylene propylene diene monomer rubber.
9. The fiber optic transmission assembly for nuclear power plant reactor underwater laser welding of claim 5 wherein said fastener comprises a bolt and a nut, said bolt threaded through said connection portion of said clamp.
10. The optical fiber transmission assembly for underwater laser welding of a nuclear power station reactor according to claim 4, wherein the inner metal protection tube is a stainless steel corrugated tube, and the outer radiation-resistant polymer protection layer is an ethylene-propylene-diene monomer heat shrink tube.

Description

Optical fiber transmission assembly for underwater laser welding of nuclear power station reactor Technical Field The invention relates to the technical field of nuclear power station equipment maintenance, in particular to an optical fiber transmission assembly for underwater laser welding of a nuclear power station reactor. Background The internal components of the nuclear power station reactor are in an extreme environment with high radiation and high water pressure for a long time, so that defects are easy to generate and underwater welding repair is required. Underwater laser welding technology is suitable for confined spaces, but its core beam transport assembly (fiber and QBH output devices) presents serious challenges in this environment. High energy radiation can deteriorate the performance of silica fibers, leading to increased optical loss, material degradation and even breakage. Meanwhile, the high water pressure and possible water molecule infiltration of the deepwater environment can further influence the laser transmission quality and the equipment life. The existing underwater welding technology mostly adopts a sealed cabin scheme of inert gas drainage or resists water flow disturbance through a mechanical structure, but is not specially designed for nuclear radiation environment. Disclosure of Invention The invention aims to provide an optical fiber transmission assembly for underwater laser welding of a nuclear power station reactor, which solves the problems of the prior art and realizes high radiation protection and high water pressure sealing. In order to achieve the above object, the present invention provides the following solutions: The invention provides an optical fiber transmission assembly for underwater laser welding of a nuclear power station reactor, which comprises an optical fiber output assembly, a laser optical fiber, a radiation-resistant protective sleeve, a connector, an annular elastic sealing element and a waterproof sealing agent, wherein one end of the optical fiber output assembly is provided with an optical fiber connector, one end of the laser optical fiber is welded with the end part of the optical fiber connector, the radiation-resistant protective sleeve is of a radiation-resistant composite structure and sleeved outside the optical fiber, the end part of the radiation-resistant protective sleeve, which is close to the optical fiber output assembly, is provided with the sealing connector, the connector is sleeved outside the optical fiber connector and is used for being in sealing connection with the sealing connector, the annular elastic sealing element is sleeved on the optical fiber connector and is positioned in the connector, the connector in a state of being connected with the sealing connector can apply axial compression load to the annular elastic sealing element, the annular elastic sealing element is forced to be elastically deformed and cling to the outer surface of the optical fiber connector and the inner surface of the connector, and the waterproof sealing agent is filled in an annular gap between one end, which is far away from the sealing connector and the optical fiber connector. The profiling protection clamp comprises at least two clamp bodies which can be spliced, a first limiting cavity, a connecting cavity and a second limiting cavity which are sequentially arranged in an internal cavity formed by splicing the clamp bodies, the first limiting cavity can accommodate an integral connecting structure of the connector and the sealing connector, the second limiting cavity can accommodate an outer protruding structure on the optical fiber output assembly, and the inner diameters of the first limiting cavity and the second limiting cavity are different from the inner diameter of the connecting cavity. Preferably, one end of the sealing joint, which is close to the connector, is provided with a limiting part and an external thread section, the external thread section is fixedly connected with the limiting part, an internal thread hole of the connector is in threaded connection with the external thread section, and a sealing rubber gasket is sleeved on the external thread section. Preferably, the radiation-resistant protective sleeve comprises an inner metal protective tube and an outer radiation-resistant polymer protective layer, wherein the outer radiation-resistant polymer protective layer is tightly attached to the inner metal protective tube, and the inner metal protective tube is of a bendable corrugated tubular structure. Preferably, the clamping bodies are fixedly connected through a plurality of fasteners, and the fasteners penetrate through corresponding connecting parts of the clamping bodies. Preferably, the laser optical fiber is a step-type optical fiber with a cladding made of fluorine-doped quartz material and an inner core made of pure silicon core material. Preferably, the connector is a stainless steel waterproof explosion-proo