CN106610516A - Optical fiber watertight wall-through member - Google Patents

Abstract

The invention belongs to the field of underwater optical fiber transmission, in particular to an optical fiber watertight wall-piercing part, including a tail cap, a shell and a push rod, wherein the shell is screwed to the wall of a pressure-resistant cabin and connected to the pressure-resistant cabin The walls are sealed against each other, and there is a channel for the optical fiber to penetrate inside the housing. One side of the channel is filled with a fixed optical fiber and a sealing filler A that withstands the axial force of the external seawater on the optical fiber, and the other side accommodates Filling body B is installed; one end of the shell located in the pressure-resistant cabin is threadedly connected with a tail cap, and the other end outside the pressure-resistant cabin is threadedly connected with a push rod, and the push rod applies pressure to the optical fiber through the filling body B. The axial force in the ballast chamber, and the sealing of the channel in the casing is realized through the elastic deformation of the filling body B. The invention has the characteristics of simple structure, convenient assembly and disassembly, good sealing performance and low cost.

Description

Fiber optic watertight wall penetration

technical field

The invention belongs to the field of underwater optical fiber transmission, in particular to an optical fiber watertight wall-penetrating part.

Background technique

Due to the advantages of optical fiber transmission with wide transmission frequency, large communication capacity, low loss, immunity to electromagnetic interference, small diameter of optical cable, light weight, and abundant sources of raw materials, the application of optical fiber transmission on land has long been very common. Among them, the main methods of optical fiber connection include optical fiber connector (joint), direct fusion of optical fiber connector and so on. For the same reason, the application of fiber-optic transmission in underwater is becoming more and more common, especially in the fields of transoceanic communication, offshore oil and natural gas production, submarine information network and underwater robots; its large scale and wide range, unprecedented.

As is the case on land, fiber optic connections are equally common and essential in underwater applications. However, the underwater connection of optical fiber, especially in the deep water environment of several kilometers, has its own particularity. Not only must the optical fiber connection meet the transmission and communication requirements, but it must also meet the strength and watertightness requirements in a high water pressure environment. . Watertight optical fiber connectors are usually used for the connection of optical fibers under water. This kind of connector is not produced in China, and there are only a few watertight connector manufacturers abroad. Foreign watertight optical fiber connectors are expensive, which greatly increases the application cost.

Contents of the invention

The object of the present invention is to provide a watertight wall-piercing part for optical fiber. The optical fiber watertight wall-piercing part is mainly used for the establishment of optical fiber channels inside and outside underwater pressure-resistant cabins used in underwater robots and the like.

The purpose of the present invention is achieved through the following technical solutions:

The present invention includes a tail cap, a housing and a push rod, wherein the housing is screwed to the wall of the pressure-resistant cabin and is in sealing contact with the wall of the pressure-resistant cabin, and the inside of the housing is opened with a channel for the optical fiber to penetrate. One side of the channel is filled with a fixed optical fiber and a sealed filler A that withstands the axial force of the external seawater on the optical fiber, and the other side accommodates a filler B; There is a tail cap, and the other end located outside the pressure chamber is threadedly connected with a push rod. The push rod applies an axial force to the optical fiber in the pressure chamber through the filling body B, and is realized by the elastic deformation of the filling body B. Sealing of said channels within the housing.

Wherein: the filling body B is a plurality of O-shaped rubber sealing rings B and a plurality of spacer rings, each O-shaped rubber sealing ring B and the spacer rings are arranged alternately, and the optical fiber passes through each O-shaped rubber sealing ring B and the spacer rings in turn. ring;

The push rod is a stepped cylinder with a through hole in the middle, and either end is formed with an external thread that is threadedly connected with the other end of the housing. The diameter of the middle part of the push rod is larger than the diameter of the two ends. The two sides of the radial section of the middle part of the rod are symmetrically provided with planes that facilitate the rotation of the push rod;

The radial width of the middle part of the housing is larger than the radial width of the two ends, and a sealing groove is opened on one side of the middle part of the housing, and a sealing abutment with the wall of the pressure-resistant compartment is placed in the sealing groove. Connected O-shaped rubber sealing ring A; one end of the shell and the middle part are formed with an external thread that is threaded with the wall of the pressure-resistant cabin, and one end of the shell is formed with a threaded connection with the tail cap external thread, the other end of the housing is formed with an internal thread threadedly connected with the push rod;

The axial section of the tail cap is in the shape of a "U", the open end of the "U" is formed with an internal thread threadedly connected with one end of the housing, the bottom of the "U" extends outward in the axial direction, And there is a through hole for the optical fiber to pass through at the bottom and extension of the "U" shape;

The axial centerlines of the tail cap, the housing, the push rod and the channel inside the housing are collinear.

Advantage of the present invention and positive effect are:

1. The present invention has simple structure, convenient assembly and disassembly, and good sealing performance.

2. The inner cavities on the left and right sides of the inner channel of the shell of the present invention are respectively filled with fillers, which can not only fix the optical fiber and withstand the axial force acting on the optical fiber from the sea water in the external environment, but also realize the alignment of the optical fiber channel in the middle of the shell through the wall. Sealing of external environment sea water.

3. The tail cap of the present invention can protect the optical fiber passing through the wall part to carry out the pressure-resistant wheelhouse, and prevent the optical fiber from bending.

4. The present invention greatly reduces the cost of optical fiber connection under water.

Description of drawings

Fig. 1 is a schematic diagram of the internal structure of the present invention;

Fig. 2 is the A direction view of Fig. 1;

Among them: 1 is the tail cap, 2 is the shell, 3 is the O-shaped rubber sealing ring A, 4 is the O-shaped rubber sealing ring B, 5 is the solid epoxy resin, 6 is the spacer ring, 7 is the push rod, 8 is the optical fiber , 9 is a plane, and 10 is a sealing groove.

detailed description

The present invention will be described in further detail below in conjunction with the accompanying drawings.

As shown in Figure 1, the present invention comprises a tail cap 1, a housing 2 and a push rod 7, wherein the radial width of the middle part of the housing 2 is greater than the radial width of the two ends, and the inside of the housing 2 is opened for the optical fiber 8 to pass through. incoming channel. There is an external thread between one end of the shell 2 and the middle part, which is used for the threaded installation of the optical fiber watertight wall-piercing part and the wall of the pressure-resistant cabin; There is a tail cap 1; the other end of the shell 2 is located outside the pressure chamber, and is formed with an internal thread, and a push rod 7 is threaded. One side of the middle part of the housing 2 is provided with a sealing groove 10, and an O-shaped rubber sealing ring A3 is placed in the sealing groove 10 to seal against the wall of the pressure-resistant cabin, and is used for sealing between the pressure-resistant cabin and the external seawater.

One side (left side) of the inner channel of the housing 2 is filled with a filler A, the filler A of the present invention can be a solid epoxy resin 5, and can be potted in the inner cavity on the left side for fixing the optical fiber 8 and withstand the external environment The axial force of seawater acting on the optical fiber 8. The other side (right side) of passage accommodates packing body B, and packing body B of the present invention is a plurality of O-shaped rubber sealing rings B4 and a plurality of spacer rings 6, and the O-shaped rubber sealing ring B4 of the present embodiment and spacer There are three rings 6, and each O-shaped rubber sealing ring B4 and spacer rings 6 are arranged alternately. The spacer ring of the present invention can be made of polytetrafluoroethylene material.

The tail cap 1 is used to protect the optical fiber 8 entering the pressure-resistant cabin through the optical fiber watertight wall-piercing part, and prevent the optical fiber 8 from being bent. The axial section of the tail cap 1 is "U"-shaped, and the open end of the "U" shape is formed with an internal thread that is screwed with one end of the housing 2. The bottom of the "U" shape extends outward in the axial direction, and The bottom and the extension of the "U" shape have a through hole for the optical fiber 8 to pass through.

The push rod 7 is a stepped cylinder with a through hole in the middle, and either end is formed with an external thread that is threadedly connected with the other end of the housing 2 . The diameter of the middle part of the push rod 7 is greater than the diameter of both ends, and a plane 9 convenient to rotate the push rod 7 is arranged symmetrically on both sides of the radial section of the middle part of the push rod 7 .

The axial centerlines of the tail cap 1 , the housing 2 , the push rod 7 and the inner channel of the housing 2 of the present invention are collinear.

Working principle of the present invention is:

As shown in Figure 1, after the casing 2 of the present invention is screwed on the wall of the pressure-resistant cabin, the push rod 7 is tightened, and the push rod 7 moves axially to the direction of the pressure-resistant cabin, and the O-shaped rubber sealing ring is provided by the spacer ring 6. B4 exerts an axial force to the left (ie, to the direction of the pressure-resistant cabin), compresses the O-shaped rubber sealing ring B4 and produces radial deformation, and realizes the sealing of the inner channel of the shell 2 to the seawater in the external environment. The optical fiber 8 entering from the left end is connected to the optical fiber in the pressure-resistant cabin through an optical fiber joint or fusion splicing, so as to realize the optical fiber connection inside and outside the pressure-resistant cabin.

The invention can be used for the internal and external connection of a single optical fiber in underwater pressure-resistant cabins and the like.

Claims (7)

1. a kind of optical fiber watertight wall-through part, it is characterised in that：Including tail cap (1), housing (2) And push rod (7), wherein housing (2) be threadedly connected on pressure cabin wall, it is and resistance to described Ballasting locular wall is sealed against, and is provided with the passage penetrated for optical fiber (8) inside the housing (2), The side of the passage is filled with fixed optical fiber (8) and bears external environment condition seawater eroding in optical fiber (8) the sealing obturator A of axial force on, opposite side are equipped with obturator B；The housing (2) Threaded one end in pressure-resistant cabin room is connected with tail cap (1), another outside pressure-resistant cabin room End is threaded with push rod (7), and the push rod (7) is applied to optical fiber (8) by obturator B Plus to the axial force in pressure-resistant cabin room, and housing is realized in the elastic deformation by the obturator B (2) sealing of the passage in.

2. the optical fiber watertight wall-through part as described in claim 1, it is characterised in that：It is described to fill out Body B is filled for multiple O-shaped rubber seal B (4) and multiple spacer rings (6), each O-shaped rubber Glue sealing ring B (4) is arranged alternately with spacer ring (6), and the optical fiber (8) sequentially passes through Each O-shaped rubber seal B (4) and spacer ring (6).

3. the optical fiber watertight wall-through part as described in claim 1, it is characterised in that：It is described to push away Bar (7) is that centre opens up the ladder circle column of through hole, and either end is formed with and the housing (2) The other end threaded connection external screw thread, push rod (7) mid portion with diameter greater than two ends Partial diameter, in being symmetrically arranged on two with just for the push rod (7) mid portion radial section In the plane (9) of rotating push rod (7).

4. the optical fiber watertight wall-through part as described in claim 1, it is characterised in that：The shell Radial width of the radial width of body (2) mid portion more than two end portions, and in the shell The side of body (2) mid portion is provided with seal groove (10), the seal groove (10) and is equipped with O-shaped rubber seal A (3) sealed against with the pressure cabin wall.

5. the optical fiber watertight wall-through part as described in claim 4, it is characterised in that：The shell Be threadedly coupled with pressure cabin wall outer is formed between one end of body (2) and the mid portion Screw thread, one end of the housing (2) are formed with the external screw thread being threadedly coupled with the tail cap (1), The other end of the housing (2) is formed with the female thread being threadedly coupled with the push rod (7).

6. the optical fiber watertight wall-through part as described in claim 1, it is characterised in that：The tail The axial cross section of cap (1) is " U "-shaped, and the opening of the " u "-shaped is formed with and the housing (2) female thread of threaded one end connection, the bottom of the " u "-shaped are extended axially outwardly, and The through hole passed through for optical fiber (8) is provided with the bottom of the " u "-shaped and extension.

7. the optical fiber watertight wall-through part as described in claim 1 to 6 any claim, its It is characterised by：The tail cap (1), housing (2), push rod (7) and housing (2) inside The longitudinal center line of the passage is conllinear.