Isolated conductor grounding device in armored optical cable for space navigation and implementation method of isolated conductor grounding device

Abstract

The invention provides an isolated conductor grounding device in an armored optical cable for aerospace and an implementation method thereof, and relates to the technical field of aerospace equipment. The grounding device comprises a metal leading-out part and a metal switching part, and the metal leading-out part is conductively connected with the metal switching part; the metal leading-out part is conductively connected with the metal armoring part in the armoring optical cable, and the metal switching part is conductively connected with the whole satellite. The implementation method comprises the following steps: step 1, manufacturing a metal switching part; 2, manufacturing a metal lead-out part; and step 3, conducting connection. On the basis, equipotential connection between the metal armored part and the whole satellite can be indirectly established, so that the grounding effect of the isolated conductor in the armored optical cable can be realized, and the problem of limitation of the existing technical scheme in grounding treatment of the isolated conductor in the metal armored optical cable assembly is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of aerospace equipment, and in particular to a grounding device for an isolated conductor in an armored optical cable for aerospace and a method for implementing the same. Background Art

[0002] In the aerospace field, isolated conductors in aerospace products need to be grounded. This requirement is mentioned in the relevant regulations proposed by the China Academy of Space Technology and the Shanghai Microsatellite Research Center. Specifically, isolated conductors are conductors that cannot be directly grounded and cannot be connected to the same potential. During space flight, due to long-term exposure to various high-energy particle radiation environments, isolated conductors in aerospace products are prone to static charge accumulation. When the static charge accumulates to a certain level, electrostatic discharge will occur, which will cause damage to the components in the aerospace products, leading to functional failure of the aerospace products and difficulty in controlling the satellite's electrostatic environment. Therefore, grounding isolated conductors in aerospace products is very necessary. Among them, because satellites are independent entities in the aerospace environment and do not have the traditional earth, the so-called grounding treatment refers to establishing the same potential as the isolated conductor and the entire satellite (referring to a fully assembled satellite).

[0003] Aerospace products often utilize floating metal-shell optoelectronic components and metal-armored optical cable assemblies. The floating metal shells of optoelectronic components and the metal armor within metal-armored optical cable assemblies are isolated conductors. Existing grounding solutions for isolated conductors in aerospace products primarily target the floating metal shells of optoelectronic components. For example, patent publication number CN109936969A provides an isolated conductor handling device and installation method for components with floating metal shells in aerospace products. Regarding the grounding of isolated conductors in metal-armored optical cable assemblies, there are few viable solutions in the prior art. Typically, the outer sheath of the armored optical cable is stripped and a separate grounding wire is routed to the satellite's interior using a lead wire. However, this approach has practical limitations. First, armored optical cables are typically long, numerous, and widely distributed, making the outer sheath stripping and grounding wire routing operations cumbersome. Second, the resulting grounding wire can disrupt the satellite's internal wiring layout and introduce unknown electromagnetic interference risks.

[0004] In summary, the present invention provides a grounding device for an isolated conductor in an armored optical cable for aerospace use and a method for implementing the same. Summary of the Invention

[0005] The object of the present invention is to provide a grounding device for an isolated conductor in an armored optical cable for aerospace use and a method for implementing the same, so as to solve the problem mentioned in the above background technology regarding the grounding treatment of isolated conductors in metal armored optical cable assemblies and the limitations of the existing technical solutions.

[0006] The present invention is achieved by adopting the following technical solutions:

[0007] A grounding device for an isolated conductor in an armored optical cable for aerospace use comprises a metal lead-out portion and a metal transition portion, wherein the metal lead-out portion and the metal transition portion are conductively connected; the metal lead-out portion is conductively connected to the metal armor portion in the armored optical cable, and the metal transition portion is conductively connected to the entire satellite; the metal lead-out portion is used to lead out the metal armor portion as an isolated conductor, and the metal transition portion is used to indirectly establish an equipotential connection between the metal lead-out portion and the entire satellite.

[0008] In the grounding device provided by the present invention, by providing a metal lead-out portion and a metal transition portion, an equipotential connection can be indirectly established between the metal armor portion and the entire satellite, thereby achieving the effect of grounding the isolated conductors in the armored optical cable; wherein, by providing the metal transition portion as an intermediate component, only the metal transition portion is connected to the entire satellite. Even when grounding isolated conductors in multiple armored optical cables, it is not necessary to make multiple separate connections to the entire satellite, thereby effectively avoiding affecting the wiring layout inside the entire satellite.

[0009] Furthermore, the metal transfer part includes a metal casing, a hollow space is provided inside the metal casing, and the metal casing is conductively connected to the entire star.

[0010] Furthermore, the metal lead-out part includes a jumper and a metal terminal. The jumper is made of conductive material. One end of the jumper is conductively connected to the metal armor part of the armored optical cable, and the other end is conductively connected to the metal terminal. The metal terminal is conductively connected to the metal casing.

[0011] Furthermore, a fiber installation hole is opened on the side wall of the metal casing, the armored optical cable and jumper extend into the interior of the metal casing through the fiber installation hole, and the metal terminal is conductively connected at the installation position inside the metal casing.

[0012] Furthermore, the metal lead-out portion includes a metal flange, which is conductively connected to the metal armor portion and the metal casing in the armored optical cable respectively, and the metal armor portion is passed through the metal flange.

[0013] Furthermore, the metal flange is mounted on a side wall of the metal casing, a through hole is provided on the side wall of the metal casing, and the armored optical cable extends into the interior of the metal casing through the through hole.

[0014] A method for implementing an isolated conductor grounding device in an armored optical cable for aerospace use, for implementing the above-mentioned isolated conductor grounding device in an armored optical cable for aerospace use, comprises the following steps:

[0015] Step 1: Make the metal transfer part;

[0016] Step 2: Make the metal lead-out part;

[0017] Step 3: Make conductive connections;

[0018] In step 3, the conductive connection includes conductively connecting the metal lead-out part to the metal armor part in the armored optical cable, conductively connecting the metal lead-out part to the metal transition part, and conductively connecting the metal transition part to the entire satellite.

[0019] Furthermore, when the metal transition part includes a metal housing and the metal lead-out part includes a jumper wire and a metal terminal, step 3 includes the following sub-steps:

[0020] Step 3-A1: Use the pre-connection method or post-connection method to conductively connect one end of the jumper wire to the metal armor part of the armored optical cable;

[0021] Step 3-A2: Insert the armored fiber optic cable and jumper into the metal casing;

[0022] Step 3-A3: Connect the metal terminal block to the other end of the jumper wire.

[0023] Step 3-A4: Conductively connect the metal terminal block to the mounting location inside the metal housing;

[0024] In step 3-A1, the pre-connection method refers to conductively connecting one end of the jumper wire to the metal armor part when manufacturing the armored optical cable; the post-connection method refers to first stripping off part of the outer sheath of the armored optical cable that has been manufactured but not connected to the jumper wire to expose the metal armor part, and then conductively connecting one end of the jumper wire to the metal armor part.

[0025] Furthermore, when the metal transition portion includes a metal housing and the metal lead-out portion includes a metal flange, step 3 includes the following sub-steps:

[0026] Step 3-B1: Using a pre-installation method or a post-installation method, insert the metal armor portion of the armored optical cable through the metal flange to ensure conductive connection between the metal flange and the metal armor portion;

[0027] Step 3-B2: Insert the armored optical cable into the metal casing;

[0028] Step 3-B3: Install the metal flange on the side wall of the metal casing;

[0029] In step 3-B1, the pre-installation method refers to inserting the metal armor part into the metal flange when manufacturing the armored optical cable; the post-installation method refers to first stripping off part of the outer sheath of the armored optical cable that has been manufactured and is not connected to the metal flange to expose the metal armor part, and then inserting the metal armor part into the metal flange.

[0030] The beneficial effects achieved by the present invention are:

[0031] A grounding device for isolated conductors in armored optical cables for aerospace applications and a method for implementing the same are provided. By executing steps 1 to 3, a metal lead-out portion and a metal transition portion are obtained, thereby indirectly establishing an equipotential connection between the metal armor portion and the entire satellite, thereby achieving grounding of the isolated conductors in the armored optical cable. Compared to existing grounding methods that are cumbersome to operate and affect the internal wiring layout of the entire satellite, the present invention has a simple structure. Even when grounding isolated conductors in multiple armored optical cables, multiple separate connections to the entire satellite are not required. Therefore, the device offers the advantages of simple operation, minimal impact on the internal wiring layout of the entire satellite, and effective avoidance of unknown electromagnetic interference risks. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 1. It is a schematic diagram of the connection relationship and structure of the armored optical cable and the metal lead-out portion in the grounding device according to embodiment 1 of the present invention;

[0033] Figure 2 1. It is a schematic diagram of the connection relationship and structure of the metal lead-out portion and the metal transition portion in the grounding device according to embodiment 1 of the present invention;

[0034] Figure 3 1. It is a schematic diagram of the connection relationship and structure of the metal lead-out portion and the metal transition portion in the grounding device according to embodiment 2 of the present invention;

[0035] In the figure: 1. Connector; 2. Fiber optic cable with loose tube; 3. Metal armor; 4. Jumper; 5. Metal terminal block; 6. Metal housing; 7. Metal flange. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present invention.

[0037] Example 1

[0038] The first aspect of this embodiment provides an isolated conductor grounding device in an armored optical cable for aerospace use. Figure 1 and Figure 2, including a metal lead-out part and a metal transition part, the metal lead-out part and the metal transition part are conductively connected; the metal lead-out part is conductively connected to the metal armor part 3 in the armored optical cable, and the metal transition part is conductively connected to the entire satellite; the metal lead-out part is used to lead out the metal armor part 3 as an isolated conductor, and the metal transition part is used to indirectly establish an equipotential connection between the metal lead-out part and the entire satellite. Specifically:

[0039] An armored fiber optic cable typically includes an FC / APC connector 1, a loose tube cable 2, and a metal armor section 3. The connection between the loose tube cable 2 and the metal armor section 3 is typically secured with epoxy adhesive. In this grounding device, the metal transition section includes a metal housing 6, which has a hollow interior. The housing 6 is either partially enclosed or removable (i.e., the hollow interior allows access from outside). The housing 6 is electrically connected to the entire satellite via mounting pins. The metal lead-out portion includes a jumper wire 4 and a circular metal terminal block 5. The jumper wire 4 is made of a conductive material (such as a copper wire that meets aerospace standards or a corrosion-resistant conductive metal wire similar to copper wire). One end of the jumper wire 4 is conductively connected to the metal armor portion 3 of the armored optical cable, and the other end is conductively connected to the metal terminal block 5. The jumper wire 4 has a conductive connection segment at each end for achieving the above-mentioned conductive connection. An anti-interference segment is provided between the two conductive connection segments. The anti-interference segment includes an insulating layer (specifically, an insulating coating or sheath, etc.). The insulating layer is provided on the outer surface of the jumper wire 4. A fiber optic mounting hole is provided on the side wall of the metal housing 6. The armored optical cable and jumper wire 4 extend into the interior of the metal housing 6 through the fiber optic mounting hole. The metal terminal block 5 is conductively connected at the installation position inside the metal housing 6.

[0040] A second aspect of this embodiment provides a method for implementing an isolated conductor grounding device in an armored optical cable for aerospace use, which is used to implement the above-mentioned isolated conductor grounding device in an armored optical cable for aerospace use, comprising the following steps:

[0041] Step 1: Make a metal transfer part, that is, make a metal casing 6.

[0042] Step 2: Make the metal lead-out parts, that is, make the jumper 4 and the metal terminal 5 respectively.

[0043] Step 3: Conductive connection is performed, that is, conductive connection is made between the metal lead-out part and the metal armor part 3 in the armored optical cable, conductive connection is made between the metal lead-out part and the metal transition part, and conductive connection is made between the metal transition part and the entire satellite.

[0044] Wherein, step 3 includes the following sub-steps:

[0045] Step 3-A1: Conductively connect one end of the jumper wire 4 to the metal armor portion 3 of the armored optical cable using a pre-connection method or a post-connection method.

[0046] Specifically, the pre-connection method refers to the conductive connection between one end of the jumper wire 4 and the metal armor part 3 when the armored optical cable is manufactured; the post-connection method refers to the first part of the outer sheath of the armored optical cable that has been manufactured and is not connected to the jumper wire 4, so as to expose the metal armor part 3, and then the end of the jumper wire 4 is conductively connected to the metal armor part 3 by welding or crimping (in actual production, the connection point can be subjected to secondary insulation protection treatment).

[0047] Step 3-A2: Insert the armored optical cable and jumper 4 into the metal casing 6.

[0048] Specifically, the armored optical cable and the jumper 4 are inserted into the interior of the metal casing 6 through the optical fiber mounting hole, and after the insertion operation is completed, the length of the jumper 4 can be lengthened or shortened according to the situation inside the metal casing 6; in addition, since aerospace products will be subject to certain vibrations or impacts when running in orbit, in order to avoid causing damage to the optical cable, in actual production, epoxy glue and silicone rubber are often used to fix the intersection of the optical fiber mounting hole and the armored optical cable, and epoxy glue or silicone rubber is used to stick the anti-interference section of the jumper 4 to the inner wall of the metal casing 6.

[0049] Step 3-A3: Connect the metal terminal 5 to the other end of the jumper wire 4.

[0050] Specifically, in actual production, the metal terminal 5 and the conductive connection section of the jumper wire 4 can be crimped together.

[0051] Step 3-A4: Conductively connect the metal terminal 5 to the installation position inside the metal housing 6.

[0052] Specifically, in actual production, screws (with flat washers and spring washers) can be used to fix the metal terminal 5 to the installation position inside the metal housing 6.

[0053] In summary, by executing steps 1 to 3, the metal lead-out part and the metal transition part can be obtained, thereby indirectly establishing an equipotential connection between the metal armor part 3 and the entire satellite, thereby achieving the effect of grounding the isolated conductor in the armored optical cable.

[0054] Example 2

[0055] In a first aspect, this embodiment provides a grounding device for an isolated conductor in an armored optical cable for aerospace use. Compared with the grounding device in Example 1, the difference is as follows (the similarities are not repeated):

[0056] Please refer to Figure 3In this embodiment, the metal lead-out portion includes a metal flange 7, which is electrically connected to the metal armor portion 3 and the metal housing 6 of the armored optical cable, respectively. The metal armor portion 3 is inserted through the metal flange 7. Specifically, the metal flange 7 is mounted on the side wall of the metal housing 6, which has a through hole formed in the side wall. The armored optical cable extends into the interior of the metal housing 6 through the through hole. In actual production, the locking device attached to the metal flange 7 can be used to lock the metal armor portion 3 within the metal housing 6, thereby ensuring a reliable connection between the armored optical cable and the metal housing 6.

[0057] A second aspect of this embodiment provides a method for implementing an isolated conductor grounding device in an armored optical cable for aerospace use, which is used to implement the above-mentioned isolated conductor grounding device in an armored optical cable for aerospace use, comprising the following steps:

[0058] Step 1: Make a metal transfer part, that is, make a metal casing 6.

[0059] Step 2: Make the metal lead-out part, that is, make the metal flange 7.

[0060] Step 3: Conductive connection is performed, that is, conductive connection is made between the metal lead-out part and the metal armor part 3 in the armored optical cable, conductive connection is made between the metal lead-out part and the metal transition part, and conductive connection is made between the metal transition part and the entire satellite.

[0061] Wherein, step 3 includes the following sub-steps:

[0062] Step 3-B1: Using a pre-installation method or a post-installation method, the metal armor portion 3 of the armored optical cable is passed through the metal flange 7 so that the metal flange 7 and the metal armor portion 3 are electrically connected.

[0063] Specifically, the pre-installation method refers to the process of inserting the metal armor part 3 into the metal flange 7 when manufacturing the armored optical cable; the post-installation method refers to the process of first stripping off part of the outer sheath of the armored optical cable that has been manufactured and is not connected to the metal flange 7 to expose the metal armor part 3, and then inserting the metal armor part 3 into the metal flange 7 (using crimping or welding to make the metal flange 7 and the metal armor part 3 in close contact).

[0064] Step 3-B2: Insert the armored optical cable into the metal casing 6.

[0065] Specifically, the armored optical cable is extended into the interior of the metal casing 6 through the through hole.

[0066] Step 3-B3: Install the metal flange 7 on the side wall of the metal housing 6;

[0067] Specifically, in actual production, flange fixing screws can be used to mount the metal flange 7 on the side wall of the metal housing 6 .

[0068] In summary, by executing steps 1 to 3, the metal lead-out part and the metal transition part can be obtained, thereby indirectly establishing an equipotential connection between the metal armor part 3 and the entire satellite; among them, since the volume of the metal flange 7 is relatively large, it will occupy more space, so the grounding device described in this embodiment is more suitable for situations where the number of armored optical cables assembled is small in actual applications.

[0069] It should be noted that the parts not described in detail or expanded in the above scheme are all prior art, which do not belong to the improvements made by the present invention over the prior art, nor do they belong to the scope of protection of the technical solution of the present invention, so they will not be described in detail herein. Of course, the above content is only a preferred embodiment of the present invention and cannot be considered to limit the scope of the embodiments of the present invention. The present invention is not limited to the above examples, and equal changes and improvements made by ordinary technicians in this technical field within the essential scope of the present invention should all fall within the scope of the patent coverage of the present invention.

Claims

1. A grounding device for an isolated conductor in an armored optical cable for aerospace use, characterized by: The invention comprises a metal lead-out part and a metal transition part, wherein the metal lead-out part and the metal transition part are conductively connected; the metal lead-out part is conductively connected to the metal armor part (3) in the armored optical cable, and the metal transition part is conductively connected to the entire satellite; the metal lead-out part is used to lead out the metal armor part (3) as an isolated conductor, and the metal transition part is used to indirectly establish an equipotential connection between the metal lead-out part and the entire satellite.

2. The isolated conductor grounding device in aerospace armored optical cable according to claim 1, characterized in that: The metal transfer part comprises a metal casing (6), a hollow space is provided inside the metal casing (6), and the metal casing (6) is electrically connected to the entire star.

3. The isolated conductor grounding device in aerospace armored optical cable according to claim 2, characterized in that: The metal lead-out portion comprises a jumper (4) and a metal terminal (5); the jumper (4) is made of a conductive material; one end of the jumper (4) is conductively connected to the metal armor portion (3) in the armored optical cable; the other end is conductively connected to the metal terminal (5); and the metal terminal (5) is conductively connected to the metal housing (6).

4. The isolated conductor grounding device in aerospace armored optical cable according to claim 3, characterized in that: An optical fiber installation hole is provided on the side wall of the metal casing (6); the armored optical cable and the jumper (4) extend into the interior of the metal casing (6) through the optical fiber installation hole; and the metal terminal (5) is conductively connected to an installation position inside the metal casing (6).

5. The isolated conductor grounding device in aerospace armored optical cable according to claim 2, characterized in that: The metal lead-out portion comprises a metal flange (7), the metal flange (7) being respectively conductively connected to the metal armor portion (3) and the metal casing (6) in the armored optical cable, and the metal armor portion (3) being passed through the metal flange (7).

6. The isolated conductor grounding device in aerospace armored optical cable according to claim 5, characterized in that: The metal flange (7) is mounted on the side wall of the metal casing (6); a through hole is provided on the side wall of the metal casing (6); and the armored optical cable extends into the interior of the metal casing (6) through the through hole.

7. A method for implementing an isolated conductor grounding device in an armored optical cable for aerospace use, for implementing the isolated conductor grounding device in an armored optical cable for aerospace use according to any one of claims 1 to 6, characterized in that: The steps include: Step 1: Make the metal transfer part; Step 2: Make the metal lead-out part; Step 3: Make conductive connections; In step 3, the conductive connection includes conductively connecting the metal lead-out part to the metal armored part (3) in the armored optical cable, conductively connecting the metal lead-out part to the metal transition part, and conductively connecting the metal transition part to the entire satellite.

8. The method for implementing the isolated conductor grounding device in the aerospace armored optical cable according to claim 7, characterized in that: When the metal transfer part includes a metal housing (6), and the metal lead-out part includes a jumper wire (4) and a metal terminal (5), step 3 includes the following sub-steps: Step 3-A1: Conductively connect one end of the jumper wire (4) to the metal armor portion (3) of the armored optical cable using a pre-connection method or a post-connection method; Step 3-A2: Insert the armored optical cable and jumper (4) into the metal housing (6); Step 3-A3: Conductively connect the metal terminal block (5) to the other end of the jumper wire (4); Step 3-A4: Conductively connect the metal terminal block (5) to the mounting position inside the metal housing (6); In step 3-A1, the pre-connection method refers to conductively connecting one end of the jumper wire (4) to the metal armor part (3) when manufacturing the armored optical cable; the post-connection method refers to first stripping off part of the outer sheath of the armored optical cable that has been manufactured but not connected to the jumper wire (4) to expose the metal armor part (3), and then conductively connecting one end of the jumper wire (4) to the metal armor part (3).

9. The method for implementing the isolated conductor grounding device in the aerospace armored optical cable according to claim 7, characterized in that: When the metal transition portion includes a metal housing (6) and the metal lead-out portion includes a metal flange (7), step 3 includes the following sub-steps: Step 3-B1: Using a pre-installation method or a post-installation method, the metal armor portion (3) of the armored optical cable is passed through the metal flange (7) so that the metal flange (7) and the metal armor portion (3) are electrically connected; Step 3-B2: Insert the armored optical cable into the metal casing (6); Step 3-B3: Install the metal flange (7) on the side wall of the metal housing (6); In step 3-B1, the pre-installation method refers to inserting the metal armor part (3) into the metal flange (7) when manufacturing the armored optical cable; the post-installation method refers to first stripping off part of the outer sheath of the armored optical cable that has been manufactured and is not connected to the metal flange (7) to expose the metal armor part (3), and then inserting the metal armor part (3) into the metal flange (7).

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