Low voltage tolerant fiber optic cable adapter

Abstract

The utility model provides a kind of low-voltage-resistant optical cable adapter, it includes internal optical cable and insulator;The first end of the internal optical cable is connected with data acquisition and analysis equipment, and the second end is connected with optical sensor after passing through the insulator;First protective cover is sealingly arranged between the first end of the internal optical cable and the insulator;Second protective cover is sealingly arranged between the insulator and the second end.The optical cable adapter is used for connecting between optical sensor and query instrument or demodulator, plays the role of multi-optical cable bundling switching, and is suitable for preventing current from "creeping" on the surface of optical cable of optical sensor in high-voltage live environment in rainy, dusty or electromagnetic and other harsh outdoor environments.

Description

Technical Field

[0001] This utility model relates to the field of power equipment, specifically to a low-voltage resistant optical cable adapter. Background Technology

[0002] China is a major producer and user of electric power, with widespread use of high-voltage electricity in industrial and commercial applications. For example, in the rail transit industry, there's the relationship between the pantograph and the contact wire. The contact wire typically provides 1500V DC for urban rail and 25kV AC for high-speed rail. High-speed trains draw power from the contact wire via a pantograph mounted on the roof of the carriages. Therefore, optical sensors immune to electromagnetic interference (such as silicon photonic sensors) are increasingly being directly attached to the pantograph head, including silicon photonic accelerometers and silicon photonic contact force sensors. This allows for the detection of the dynamic mechanical relationship between the pantograph and the contact wire, playing a positive role in train maintenance.

[0003] Currently, optical fibers are widely used as the medium for signal transmission. In ideal or indoor environments, optical fibers are generally considered non-conductive. However, in practical industrial applications, the outer layer of the optical cable poses a risk of creepage. For example, in industrial applications, the optical fiber is covered with a "low-smoke, halogen-free, flame-retardant, and hydrophobic" cladding to protect the inner fibers. On a moving train, the dynamic friction between the pantograph's carbon contact plate and the contact wire causes a large amount of frictional carbon and copper dust to fall and adhere to the optical cable cladding of the optical sensor. Therefore, there is a risk that current may creep along the paste-like carbon / copper dust attached to the outer cladding and enter the interior of the train carriage.

[0004] In view of this, it is necessary to research and provide an industrial fiber optic adapter that can be used in the aforementioned harsh environments and prevent fiber optic cable creep. Utility Model Content

[0005] To address the aforementioned technical problems, this utility model provides a low-voltage resistant optical fiber adapter. This adapter is used for connecting optical sensors to interpolators or demodulators, serving as a multi-optical fiber bundle adapter. It is suitable for harsh outdoor environments with rain, dust, or electromagnetic interference, preventing current from "creeping" across the surface of the optical fiber of the optical sensor, which is exposed to high voltage.

[0006] This utility model provides a low-voltage resistant optical fiber adapter, which includes an internal optical fiber and an insulator; the first end of the internal optical fiber is connected to a data acquisition and analysis device, and the second end passes through the insulator and is connected to an optical sensor; a first protective cover is sealed between the first end of the internal optical fiber and the insulator; a second protective cover is sealed between the insulator and the second end.

[0007] As an example, the first protective cover and the insulator are connected by a through-hole bolt; a metal spring and a metal gasket are sequentially arranged between the through-hole bolt and the inner wall of the first protective cover, and a rubber sealing ring is arranged between the outer wall of the first protective cover and the insulator; the internal optical cable passes through the through hole of the through-hole bolt.

[0008] As an example, an insulator and a second protective cover are connected by a through-hole stud; the through-hole stud includes a column and a locking end, the column of the through-hole stud passes through a metal spring, a metal washer, the second protective cover and a rubber sealing ring in sequence and enters the interior of the insulator, and the locking end is connected to a locking nut; the internal optical cable passes through the through hole of the through-hole stud.

[0009] As an example, the internal optical cable is a bundled multi-core optical cable; one end of the bundled multi-core optical cable is connected to the MPO ferrule, and the other end passes through the insulator and is dispersed into multiple independent optical fibers; the MPO ferrule is located inside the main cable socket, and the first protective cover is sealed between the main cable socket and the insulator; the second protective cover is sealed between the insulator and the multiple independent optical fibers.

[0010] As an example, the second protective cover is provided with multiple branch cable sockets, the inner end of which is connected to the multiple independent optical fibers, and the outer end is connected to the optical cable from the optical sensor;

[0011] Alternatively, the wall of the second protective cover is provided with multiple openings, and each of the multiple openings is provided with a gland on the outer side of the wall; each of the multiple independent optical fibers is provided with a first plug connected to one end of the flange, and the other end of the flange is connected to a second plug of the external optical fiber from the optical sensor.

[0012] As an example, the first protective cover includes a main cable housing base and a main cable housing; the main cable housing is a cylinder with openings at both ends, one end of the main cable housing base is inserted into the main cable housing, and the other end has a circular end face that blocks one end opening of the main cable housing, and a main cable socket is provided on the circular end face.

[0013] As an example, the main cable socket is fastened to the circular end face by a main cable socket nut.

[0014] As an example, the second protective cover includes a branch cable housing and a branch cable housing base; the branch cable housing is a cuboid structure with an open bottom and an inner cavity, and the branch cable housing base is sealed to the open bottom; a plurality of branch cable sockets are provided on the wall surface of one side wall of the branch cable housing.

[0015] As an example, the four corners of the branch cable housing are provided with mounting holes for fixing parts. After passing through the bolt washer, the fixing bolts pass through the mounting holes and are connected to the place to be fixed.

[0016] As an example, each fixing bolt passes through the bolt washer and then through the mounting hole to connect to the elevated insulator, which is then fixed to the mounting plate. The mounting plate has a waist hole, and the waist hole and the surface to be installed are connected by screws.

[0017] Compared with the prior art, this utility model has the following advantages:

[0018] 1. The low-voltage resistant optical cable adapter described in this utility model is an anti-creep optical cable adapter, suitable for connecting optical sensors and query instruments or demodulators in harsh outdoor environments such as rain, dust and electromagnetic fields. It serves as a multi-optical cable bundle adapter, preventing current from "creeping" from the surface of the optical cable of the optical sensor in a high-voltage environment.

[0019] 2. The low-voltage resistant optical cable adapter described in this utility model is suitable for connecting silicon photoelectric sensors, fiber optic grating sensors, etc., which measure physical quantities such as acceleration, temperature, or contact force, with query instruments or demodulators, and has broad application prospects.

[0020] Other features and advantages of this invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of this invention may be realized and obtained by means of the structures particularly pointed out in the description, claims, and drawings. Attached Figure Description

[0021] The accompanying drawings are provided to further illustrate the technical solution of this utility model and constitute a part of the specification. They are used together with the embodiments of this application to explain the technical solution of this utility model and do not constitute a limitation on the technical solution of this utility model.

[0022] Figure 1 This is a schematic diagram of a low-voltage resistant optical cable adapter according to the present invention.

[0023] Figure 2 yes Figure 1 A partial cross-sectional view of the connection points on both sides of the insulator shown.

[0024] Figure 3 This is a schematic diagram illustrating the working mechanism of the low-voltage resistant optical cable adapter described in this utility model.

[0025] Figure 4 This is a schematic diagram of another structure for interconnecting internal and external optical fibers in the low-voltage resistant optical cable adapter described in this utility model.

[0026] Figure 5 yes Figure 1 The image shows an example of the installation of a low-voltage resistant optical fiber adapter.

[0027] Marked in the image:

[0028] 1. Main cable socket; 2. Main cable housing; 3. Main cable housing; 4. Insulator; 5. Fixing bolt; 6. Branch cable housing; 7. Branch cable socket; 8. Branch cable housing; 9. Bolt washer; 10. MPO ferrule; 11. Main cable socket nut; 12. Bundled multi-core optical cable; 12-1, Fiber 1; 12-2, Fiber 2; 12-(n-1), Fiber n-1; 12-n, Fiber n; 13-Through-hole bolt; 14-Metal washer; 15-Metal spring; 16-Rubber sealing ring; 17-Locking nut; 18-Through-hole stud; 19-Elevated insulator; 20-Mounting plate; 21-Waist hole; 22-First plug; 23-Internal optical fiber; 24-Flange; 25-Second plug; 26-Wall surface; 27-Gland connector; 28-External optical fiber; 29-Optical sensor;

[0029] n is the total number of optical fibers in the bundled multi-core optical cable. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the described embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0031] A low-voltage resistant optical fiber adapter includes an internal optical fiber and an insulator 4; a first end of the internal optical fiber is connected to a data acquisition and analysis device (e.g., a query instrument or demodulator), and a second end passes through the insulator 4 and is connected to an optical sensor 29; a first protective cover is sealed between the first end of the internal optical fiber and the insulator 4; a second protective cover is sealed between the insulator 4 and the second end.

[0032] As an example, the first protective cover and the insulator 4 are connected by a through-hole bolt 13; a metal spring 15 and a metal gasket 14 are sequentially arranged between the through-hole bolt 13 and the inner wall of the first protective cover, and a rubber sealing ring 16 is arranged between the outer wall of the first protective cover and the insulator 4; the internal optical cable passes through the through hole of the through-hole bolt 13.

[0033] As an example, the insulator 4 and the second protective cover are connected by a through-hole stud 18; the through-hole stud 18 includes a column and a locking end. The column of the through-hole stud 18 passes through the metal spring 15, the metal washer 14, the second protective cover and the rubber sealing ring 16 in sequence and enters the interior of the insulator 4. The locking end is connected to a locking nut 17; the internal optical cable passes through the through hole of the through-hole stud 18.

[0034] The internal optical cable can be either bundled or unbundled.

[0035] The following are some specific designs based on the above basic concept, which are merely examples and not exhaustive.

[0036] Example 1

[0037] like Figure 1-3 , Figure 5 As shown, as a specific example, the internal optical cable of this low-voltage resistant optical cable adapter is a bundled multi-core optical cable 12.

[0038] One end of the bundled multi-core optical cable 12 is connected to the MPO ferrule 10, and the other end passes through the insulator 4 and is then distributed into multiple independent optical fibers (such as...). Figure 3 As shown, optical fibers 1 to n (12-n) are connected. MPO ferrule 10 is located inside the main cable socket 1, and a first protective cover is sealed between the main cable socket 1 and the insulator 4. A second protective cover is sealed between the insulator 4 and the multiple independent optical fibers.

[0039] The second protective cover is provided with multiple branch cable sockets 7, the inner end of which is connected to the multiple independent optical fibers, and the outer end is connected to the optical cable from the optical sensor 29.

[0040] The first and second protective covers are made of readily available, commonly used dustproof and waterproof materials. The first protective cover seals and protects the internal bundled multi-core optical cable 12, while the second protective cover seals and protects the internal multiple independent optical fibers, preventing the intrusion of rainwater and dust.

[0041] The branch cable socket 7 is specifically a dustproof and waterproof optical cable flange, which can be used to connect optical cables from the optical sensor 29 which is in a high-voltage and strong electromagnetic environment.

[0042] The main cable socket 1 is connected to a data acquisition and analysis device (e.g., a query instrument or demodulator), and the MPO ferrule 10 located inside the main cable socket 1 ensures that the optical path from each branch cable socket 7 to the main cable socket 1 remains unobstructed.

[0043] As a specific example, the first protective cover has a cylindrical structure, and the MPO insert 10 is located in the inner cavity of the cylindrical structure; the second protective cover has a cuboid structure, and multiple branch cable sockets 7 are provided on one side wall of the cuboid structure.

[0044] As a specific example, the first protective cover includes a main cable housing 2 and a main cable housing 3; the main cable housing 3 is a cylinder with openings at both ends, one end of the main cable housing 2 is inserted into the main cable housing 3, and the other end has a circular end face that blocks one end opening of the main cable housing 3, and a main cable socket 1 is provided on the circular end face.

[0045] As a specific example, the other end of the main cable housing 3 is connected to the insulator 4 through the through-hole bolt 13, and a metal spring 15 and a metal gasket 14 are sequentially arranged between the through-hole bolt 13 and the inner wall of the main cable housing 3. A rubber sealing ring 16 is arranged between the outer wall of the main cable housing 3 and the insulator 4; the bundled multi-core optical cable 12 passes through the through hole of the through-hole bolt 13.

[0046] The through-hole bolt 13 locks the main cable housing 3 and the insulator 4 together, and its through hole allows the bundled multi-core optical cable 12 to pass through.

[0047] As a specific example, the main cable socket 1 is fastened to the circular end face by the main cable socket nut 11.

[0048] The main cable socket 1 specifically adopts an industrial-grade multi-core fiber optic aviation socket, which is dustproof and waterproof.

[0049] As a specific example, the insulator 4 is connected to the second protective cover via a through-hole stud 18; the through-hole stud 18 includes a column and a locking end, the column of the through-hole stud 18 passes through the metal spring 15, the metal washer 14, the second protective cover and the rubber sealing ring 16 in sequence and enters the interior of the insulator 4, and the locking end is connected to a locking nut 17; the bundled multi-core optical cable 12 passes through the through hole of the through-hole stud 18.

[0050] The through-hole stud 18 fixes the branch cable housing 6 to the insulator 4, and its through hole allows the bundled multi-core optical cable 12 to pass through.

[0051] Metal spring 15 increases locking torque to prevent the through-hole stud 18 and lock nut 17 from loosening. Metal washer 14 enhances locking friction.

[0052] The rubber sealing ring 16 is used to seal the gaps between the insulator 4 and the main cable housing 3, as well as between the insulator 4 and the branch cable housing 6, to prevent rainwater and dust from entering.

[0053] As a specific example, the second protective cover includes a branch cable housing 6 and a branch cable housing base 8; the branch cable housing 6 is a cuboid structure with an open bottom and an inner cavity, and the branch cable housing base 8 is combined with the bottom open sealing cover and reinforced by screws or bolts; a plurality of branch cable sockets 7 are provided on one side wall of the branch cable housing 6.

[0054] In addition to being assembled with the branch cable housing 6 to form a sealed space to protect multiple independent optical fibers, the branch cable housing 8 also serves to fix the entire low-voltage resistant optical cable adapter at the measurement site.

[0055] Insulator 4 isolates the current "creeping" from one end of the branch cable housing 6, keeping the other end of insulator 4 in a safe state.

[0056] As a specific example, the four corners of the branch cable housing 8 are provided with mounting holes for fixing parts. The fixing bolts 5 pass through the bolt washers 9 and then pass through the mounting holes to connect with the place to be fixed.

[0057] Bolt washer 9 is used to adjust the size of fixing bolt 5 to adapt to the on-site installation environment.

[0058] Figure 3 This is a schematic diagram illustrating the working mechanism of the low-voltage resistant optical cable adapter described in this utility model. Taking rail transit pantograph-catenary monitoring as an example, to solve the creepage problem, an insulator 4 with a withstand voltage greater than the contact line voltage can be used to isolate the branch cable from the sensor and the main cable entering the carriage. Inside the low-voltage resistant optical cable adapter provided in this utility model, optical fibers are bundled and spliced. The bundled multi-core optical cable 12, which acts as a bundler, passes through the inside of the insulator 4. At one end of the insulator 4, the bundled multi-core optical cable 12 is inserted into the MPO ferrule 10, and at the other end of the insulator 4, the bundled multi-core optical cable 12 is dispersed into multiple independent optical fibers (from fiber 12-1 to fiber n12-n). The first plug 22 at the ends of each fiber 12-1 to fiber n12-n is respectively inserted into one end of the corresponding branch cable socket 7.

[0059] The branch cable socket 7 can specifically adopt a dustproof and waterproof FC flange. The FC plug of the dustproof and waterproof optical fiber from the optical sensor 29 is connected to it to keep the optical path from each branch cable socket 7 to the main cable socket 1 unobstructed.

[0060] The term "low voltage" as used in this invention applies to the pressure range of subway operating systems, such as 1500~3000V DC power supply. However, it is not limited to this application area.

[0061] Example 2

[0062] This is a scheme that involves alternative designs to some of the structures in Example 1.

[0063] like Figure 4As shown, as another alternative to Embodiment 1, the wall 26 of the second protective cover is provided with multiple openings for external optical fibers 28 from the optical sensor 29 to pass through. Each of the multiple openings is provided with a gland 27 on the outside of the wall 26. The second plug 25 of the external optical fiber 28 is connected to the first plug 22 of the internal optical fiber 23 (referring to any one of the multiple independent optical fibers) through a flange 24 in the inner cavity of the second protective cover.

[0064] The first plug 22 and the second plug 25 can be ordinary plugs that are not waterproof or dustproof, and the flange 24 can be an ordinary flange that is not waterproof or dustproof.

[0065] Other structures can adopt the same design as in Example 1.

[0066] Example 3

[0067] This case is a further optimization of Example 1 or 2.

[0068] As a specific example, such as Figure 5 As shown, each fixing bolt 5 passes through the bolt washer 9 and then through the mounting hole to connect to the elevated insulator 19. The elevated insulator 19 is fixed on the mounting plate 20. The mounting plate 20 is provided with a waist hole 21, and the waist hole 21 and the surface to be installed are connected by screws.

[0069] The elevated insulator 19 is used to elevate the low-voltage resistant optical cable adapter to prevent electrical breakdown between it and the mounting surface. After the low-voltage resistant optical cable adapter is fixed to the mounting plate 20 via the elevated insulator 19, it is then fixed to the required mounting surface with screws through the slots 21 of the mounting plate 20.

[0070] Although the embodiments disclosed in this utility model are as described above, the content described is only for the purpose of facilitating understanding of this utility model and is not intended to limit this utility model. Any person skilled in the art to which this utility model pertains may make any modifications and changes in the form and details of the implementation without departing from the spirit and scope disclosed in this utility model, but the patent protection scope of this utility model shall still be determined by the scope defined in the appended claims.

Claims

1. A low-voltage resistant optical fiber adapter, characterized in that, It includes an internal optical cable and an insulator (4); the first end of the internal optical cable is connected to a data acquisition and analysis device, and the second end passes through the insulator (4) and is connected to an optical sensor (29); a first protective cover is sealed between the first end of the internal optical cable and the insulator (4); a second protective cover is sealed between the insulator (4) and the second end.

2. The low-voltage resistant optical cable adapter according to claim 1, characterized in that, The first protective cover and the insulator (4) are connected by a through-hole bolt (13); a metal spring (15) and a metal gasket (14) are sequentially arranged between the through-hole bolt (13) and the inner wall of the first protective cover, and a rubber sealing ring (16) is arranged between the outer wall of the first protective cover and the insulator (4); the internal optical cable passes through the through hole of the through-hole bolt (13).

3. The low-voltage resistant optical cable adapter according to claim 1, characterized in that, The insulator (4) and the second protective cover are connected by a through-hole stud (18); the through-hole stud (18) includes a column and a locking end. The column of the through-hole stud (18) passes through the metal spring (15), the metal gasket (14), the second protective cover and the rubber sealing ring (16) in sequence and enters the interior of the insulator (4). The locking end is connected to a locking nut (17); the internal optical cable passes through the through hole of the through-hole stud (18).

4. The low-voltage resistant optical cable adapter according to any one of claims 1-3, characterized in that, The internal optical cable is a bundled multi-core optical cable (12); one end of the bundled multi-core optical cable (12) is connected to the MPO ferrule (10), and the other end passes through the insulator (4) and is dispersed into multiple independent optical fibers; the MPO ferrule (10) is located inside the main cable socket (1), and the first protective cover is sealed between the main cable socket (1) and the insulator (4); the second protective cover is sealed between the insulator (4) and the multiple independent optical fibers.

5. The low-voltage resistant optical cable adapter according to claim 4, characterized in that, The second protective cover is provided with multiple branch cable sockets (7), the inner end of the branch cable socket (7) is connected to the multiple independent optical fibers, and the outer end is connected to the optical cable from the optical sensor (29); Alternatively, the wall surface (26) of the second protective cover is provided with multiple openings, and the multiple openings are respectively provided with gland heads (27) on the outside of the wall surface (26); the multiple independent optical fibers are respectively provided with a first plug (22) connecting one end of the flange (24), and the other end of the flange (24) is connected to a second plug (25) of the external optical fiber (28) from the optical sensor (29).

6. The low-voltage resistant optical cable adapter according to claim 4, characterized in that, The first protective cover includes a main cable housing base (2) and a main cable housing (3); the main cable housing (3) is a cylinder with openings at both ends. One end of the main cable housing base (2) is inserted into the main cable housing (3), and the other end has a circular end face and blocks one end opening of the main cable housing (3). A main cable socket (1) is provided on the circular end face.

7. The low-voltage resistant optical cable adapter according to claim 6, characterized in that, The main cable socket (1) is fastened to the circular end face by the main cable socket nut (11).

8. The low-voltage resistant optical cable adapter according to claim 4, characterized in that, The second protective cover includes a branch cable housing (6) and a branch cable housing seat (8); the branch cable housing (6) is a cuboid structure with an open bottom and an inner cavity, and the branch cable housing seat (8) is sealed to the open bottom; a plurality of branch cable sockets (7) are provided on the wall surface (26) of one side wall of the branch cable housing (6).

9. The low-voltage resistant optical cable adapter according to claim 8, characterized in that, The four corners of the branch cable housing (8) are provided with mounting holes. The fixing bolts (5) pass through the bolt washers (9) and then pass through the mounting holes to be fixed.

10. The low-voltage resistant optical cable adapter according to claim 9, characterized in that, Each fixing bolt (5) passes through the bolt washer (9) and then through the mounting hole to connect to the elevated insulator (19). The elevated insulator (19) is fixed on the mounting plate (20). The mounting plate (20) is provided with a waist hole (21), and the waist hole (21) and the surface to be installed are connected by screws.

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