Crosslinked insulated power cable for emergency lighting circuits

Abstract

This invention discloses a cross-linked insulated power cable for emergency lighting circuits applied in the cable industry. This solution, through an adaptive component, allows the branch cable to pre-elongate when subjected to unexpected tensile force, thereby changing the connection point between the branch cable and the branch protective layer to a rotatable type. This transforms the rigid contact deflection between the branch cable and the branch protective layer into a sliding deflection, solving the problem of localized stress concentration caused by rigid contact deflection in existing technologies. Simultaneously, with the monitoring sticker, unexpected stress conditions at each branch node of the main cable and branch cables can be effectively recorded, facilitating the identification and maintenance of areas with high stress during installation. This reduces the likelihood of discovering that some emergency lighting components are not working after installation, thus effectively ensuring cable laying efficiency.

Description

Technical Field

[0001] This invention relates to the field of cables, and in particular to a cross-linked insulated power cable for emergency lighting circuits. Background Technology

[0002] In the branching of emergency lighting systems, the connection at cable branches typically uses one of the following: prefabricated branch cables, T-joints, or piercing clamps. Prefabricated branch cables are cables where branch lines are prefabricated in the factory according to the user's design drawings during the production of the main cable; this is a relatively new technology product. The branch lines are prefabricated on the main cable in the factory, and the cross-sectional area and length of the branch lines are determined according to design requirements. This greatly shortens the construction cycle, significantly reduces material and construction costs, and better ensures the safety and reliability of power distribution.

[0003] Prefabricated branch cables generally consist of a main cable, branch cables, and a protective layer for wrapping the connection between the two. For example, Chinese patent CN202258411U discloses a branch cable for underground lighting, and Chinese patent CN223167739U discloses a prefabricated branch crimp connector with an emergency socket.

[0004] However, since the branch cables are relatively thin and weak, they will inevitably be dragged during the cable laying process. If the force point is on the branch cable during dragging, it is easy to damage the thin and weak branch cable. In particular, the direction of the force is not certain, which can easily cause a hard deflection between the branch cable and the outer layer of the cable at the connection point, resulting in local stress concentration. This can cause the cable sheath of the branch cable at that point to crack easily, affecting the stable transmission of power. Summary of the Invention

[0005] The core of this invention lies in its adaptive component design. When a branch cable is subjected to unexpected tensile force, the rigid resistance deflection between the branch cable and its protective layer can be transformed into a sliding deflection, thus solving the problem caused by localized stress concentration in existing technologies. Simultaneously, with the monitoring sticker in place, unexpected stress conditions at each branch node of the main cable and branch cables can be effectively recorded. This facilitates the identification and maintenance of areas with significant stress during installation, reducing the likelihood of discovering that some emergency lighting or other components are malfunctioning only after installation.

[0006] To solve the above problems, the present invention adopts the following technical solution.

[0007] A cross-linked insulated power cable for emergency lighting circuits includes a main cable and branch cables that are electrically connected to each other. The main cable and branch cables are respectively wrapped with a main protective layer and a branch protective layer at their close proximity, and the main protective layer and the branch protective layer are fixedly connected to each other. An adaptive component is provided at the end of the branch protective layer away from the connection between the main cable and the branch cable. The adaptive component includes a direction-changing block, a plurality of linkage strips fixedly connected to the outer wall of the direction-changing block, and a plurality of pre-reset strips fixedly connected between the linkage strips and the outer surface of the branch protective layer.

[0008] The reversing block includes an outer limiting section fixedly connected to the outer end of the branch cable and an inner moving section fixedly connected to the outer limiting section near the end of the branch protection layer. The end of the branch protection layer near the reversing block has a moving groove, and the part of the cable core of the branch cable located in the moving groove is spiral.

[0009] Furthermore, the moving line groove is divided into three sections. The inner wall of the middle section is spherical, while the other two sections are cylindrical. The inner wall of the cylindrical section near the outer limiting section has the same diameter as the inner wall of the spherical section. The end of the inner moving section is a spherical structure, and the end of the inner moving section matches the middle of the moving line groove.

[0010] Furthermore, a limiting groove is chiseled into the inner wall of the linkage bar. The pre-reset bar includes a guide section fixedly connected to the outer wall of the branch protection layer and a pre-extension section fixedly connected between the end of the guide section and the inner wall of the limiting groove near the deflector block. The inner wall of the limiting groove near the outer limiting section does not coincide with the outer limiting section.

[0011] Furthermore, the guide section is a rigid, fixed structure, the pre-elongation section is an elastic structure, and when the outer limiting section and the branch protective layer come into contact with each other, the part of the linkage bar corresponding to the pre-elongation section is an elastic structure, while the other parts of the linkage bar are rigid structures.

[0012] Furthermore, a positioning ring is fixedly connected to the outer end of the guide section near the pre-elongation section. The outer diameter of the positioning ring is larger than the inner diameter of the opening of the limiting groove on the side away from the outer limiting section.

[0013] Optionally, a monitoring sticker is attached to the outer end of the branch protective layer. The monitoring sticker includes two substrates bonded to the surface of the branch protective layer, two hard pressure-sensing tubes connected to the inside of the substrates, and an air sac located in the limiting groove. An elastic connecting tube is connected between the air sac and the hard pressure-sensing tubes. The elastic connecting tube is movably embedded in the branch protective layer and connects the hard pressure-sensing tubes and the air sac. The hard pressure-sensing tubes and the air sac are saturated with air.

[0014] Furthermore, a buffer ring is placed inside the limiting groove. The buffer ring is located on the side of the air bladder away from the outer limiting section. The inner wall of the hard pressure-sensing tube is coated with a force-sensitive color-changing coating. Both the substrate and the hard pressure-sensing tube are transparent.

[0015] Optionally, an isolation ring is fixedly connected to the middle of the air bladder, and two hard pressure-sensing tubes are set in the substrate. Correspondingly, two elastic connecting tubes are also set.

[0016] Furthermore, the isolation ring includes a fixed ring that is fixedly connected to the inner wall of the air accumulator near the guide section, and a pre-separation ring that is fixedly connected to the inner wall of the air accumulator away from the guide section. The pre-separation ring is located on the side of the fixed ring near the outer limit section. The fixed ring has multiple through holes, and each of the multiple through holes is press-fitted with a plug. The plug is fixedly connected to the pre-separation ring.

[0017] Furthermore, both the pre-separation ring and the fixed ring have L-shaped cross sections, and the two L-shaped structures are arranged opposite each other. The radial surfaces of the pre-separation ring and the fixed ring do not contact each other, and their circumferential surfaces are interference-fitted. The length of the plug inside the through hole is no more than 1 / 4 of the length of the through hole.

[0018] Compared with the prior art, the advantages of this invention are:

[0019] (1) This solution uses an adaptive component setting to convert the hard resistance deflection between the branch cable and the branch protection layer into a sliding deflection when the branch cable is subjected to unexpected tensile force, so as to solve the problem caused by local stress concentration in the prior art.

[0020] (2) At the same time, with the monitoring sticker set, the unexpected stress at each branch node of the main cable and branch cable can be effectively recorded, which makes it easier to identify the stress points during installation and carry out maintenance, so as to reduce the occurrence of situations where some emergency lights cannot be lit only after installation. Attached Figure Description

[0021] Figure 1 This is a perspective view of the present invention;

[0022] Figure 2 This is a partial exploded view of the present invention;

[0023] Figure 3 This is a cross-sectional perspective view of the branch protection layer portion of the present invention;

[0024] Figure 4 This is a top view of the linkage section of the present invention;

[0025] Figure 5 This is a schematic diagram of the adaptive component part of the branch cable under stress according to the present invention;

[0026] Figure 6 This is a perspective view of the branch cable of the present invention under stress;

[0027] Figure 7 This is a comparative diagram of the present invention and the prior art;

[0028] Figure 8 A perspective view of the invention with the added monitoring patch;

[0029] Figure 9 This is a cross-sectional schematic diagram of the monitoring patch portion of the present invention;

[0030] Figure 10 This is a partial cross-sectional view of the radial direction of the monitoring patch of the present invention;

[0031] Figure 11 This is a schematic diagram illustrating the changes in the monitoring patch applied to the branch cable after being subjected to stress, as per the present invention.

[0032] Figure 12 This is a partial cross-sectional schematic diagram of the monitoring patch of the present invention with an added isolation ring;

[0033] Figure 13 This is a cross-sectional schematic diagram of the isolation ring of the present invention;

[0034] Figure 14 This is a schematic diagram showing the cross-sectional change of the isolation ring when the branch cable of the present invention is subjected to excessive force;

[0035] Explanation of the labels in the diagram:

[0036] 11 Main cable, 12 Branch cable, 13 Cable core, 21 Main protective layer, 22 Branch protective layer, 201 Moving trough, 3 Directional block, 31 Outer limit section, 32 Inner moving section, 41 Linking strip, 42 Pre-reset strip, 421 Guide section, 422 Pre-extension section, 401 Positioning ring, 5 Monitoring patch, 51 Substrate, 52 Hard pressure sensing tube, 53 Air sac, 501 Elastic connecting tube, 6 Buffer ring, 7 Isolation ring, 71 Pre-separation ring, 72 Positioning ring, 73 Plug, 701 Through hole. Detailed Implementation

[0037] The technical solutions will now be clearly and completely described with reference to the accompanying drawings in the embodiments of the present invention.

[0038] First implementation method:

[0039] like Figures 1-2 A cross-linked insulated power cable for emergency lighting circuits includes a main cable 11 and a branch cable 12 that are electrically connected to each other. The main cable 11 and the branch cable 12 are respectively wrapped with a main protective layer 21 and a branch protective layer 22 on their outer sides, which are close to each other. The main protective layer 21 and the branch protective layer 22 are fixedly connected to each other. An adaptive component is provided at one end of the branch protective layer 22 away from the connection between the main cable 11 and the branch cable 12. The adaptive component includes a deflector block 3, a plurality of linkage strips 41 fixedly connected to the outer wall of the deflector block 3, and a plurality of pre-reset strips 42 fixedly connected between the linkage strips 41 and the outer surface of the branch protective layer 22.

[0040] like Figure 3 The deflector block 3 includes an outer limiting section 31 fixedly connected to the outer end of the branch cable 12 and an inner moving section 32 fixedly connected to the outer limiting section 31 near the branch protection layer 22. A moving groove 201 is formed at the end of the branch protection layer 22 near the deflector block 3. The portion of the cable core 13 of the branch cable 12 located within the moving groove 201 is spiral-shaped. By setting part of the cable core 13 in a spiral shape, it gains tensile strength. When the branch cable 12 is accidentally subjected to tensile force, the deflector block 3 can move in a direction away from the branch protection layer 22. At this time, the cable core 13 within the moving groove 201 can naturally extend to a certain extent, thus adapting to the movement of the deflector block 3 relative to the branch protection layer 22. Simultaneously, under the constraint of the linkage bar 41 and the pre-reset bar 42, the extent to which the deflector block 3 disengages from the branch protection layer 22 is limited, protecting the cable core 13 from fully straightening. Figure 5 Furthermore, because the outer limiting section 31 partially detaches from the moving wire groove 201, when subjected to force, the spherical end of the outer limiting section 31 can deflect to a certain extent at the opening of the moving wire groove 201, causing the stressed branch cable 12 to deflect to a certain extent along with the deflection of the outer limiting section 31, such as... Figures 6-7 The rigid deflection at the connection between the branch cable 12 and the branch protection layer 22 in the existing technology is transformed into a sliding deflection, thereby effectively avoiding the problem of stress concentration at this point, thus effectively protecting the branch cable 12 and making it less likely to be damaged by accidental force during installation.

[0041] like Figure 5 The moving line groove 201 is divided into three sections. The inner wall of the middle section is spherical, while the other two sections are cylindrical. The inner wall of the cylindrical section near the outer limiting section 31 has the same diameter as the inner wall of the spherical section. The end of the inner moving section 32 is a spherical structure, and the end of the inner moving section 32 matches the middle of the moving line groove 201.

[0042] It is worth noting that the lateral displacement of the linkage bar 41 is not greater than the length of the inner variable section 32, nor less than the length of the straight section of the inner variable section 32. This effectively ensures that the inner variable section 32 is not easily completely detached from the moving line groove 201. This effectively ensures that after being subjected to force, the deflector block 3 can be reset under the elastic restoring force of the pre-reset bar 42. At the same time, when the outer limit section 31 is accidentally subjected to a large force, after the outer limit section 31 moves away from the branch protection layer 22, the spherical part of the inner variable section 32 is just located at the opening of the moving line groove 201. This allows the deflector block 3 to drive the branch cable 12 to slide and deflect at the opening of the moving line groove 201. Compared with the prior art, this effectively protects the branch cable 12 from hard resistance and deflection when it is accidentally subjected to force, making it less prone to damage.

[0043] like Figure 4The inner wall of the linkage 41 has a limiting groove. The pre-reset strip 42 includes a guide section 421 fixedly connected to the outer wall of the branch protection layer 22 and a pre-extension section 422 fixedly connected between the end of the guide section 421 and the inner wall of the limiting groove near the deflector block 3. The inner wall of the limiting groove near the outer limiting section 31 does not coincide with the outer limiting section 31. The guide section 421 is a rigid, fixed structure, and the pre-extension section 422 is an elastic structure. When the outer limiting section 31 contacts the branch protection layer 22, the part of the linkage 41 corresponding to the pre-extension section 422 is an elastic structure, while the other parts of the linkage 41 are rigid structures. Figure 6 This ensures that when the branch cable 12 is subjected to unexpected force, and the outer limiting section 31 gradually moves away from the branch protection layer 22 and deflects to a certain extent with the force, the linkage bar 41 is not likely to affect the deflection of the outer limiting section 31, thus effectively ensuring that the sliding deflection of the branch cable 12 and the branch protection layer 22 can be stably achieved.

[0044] A positioning ring 401 is fixedly connected to the outer end of the guide section 421 near the pre-extension section 422. The outer diameter of the positioning ring 401 is larger than the inner diameter of the opening of the limiting groove on the side away from the outer limiting section 31. When the branch cable 12 is accidentally subjected to force, causing the linkage bar 41 to move with the movement of the outer limiting section 31, the positioning ring 401 restricts the linkage bar 41 from completely disengaging from the pre-reset bar 42. At the same time, since the pre-extension section 422 is elastic, when the tensile force on the branch cable 12 disappears, the elastic force of the pre-extension section 422 will drive the outer limiting section 31 to gradually reset. Thus, when the branch cable 12 is accidentally subjected to force again, the adaptive component can still protect the connection between the branch cable 12 and the branch protection layer 22.

[0045] This solution uses an adaptive component setting to transform the rigid resistance deflection between the branch cable 12 and the branch protection layer 22 into a sliding deflection when the branch cable 12 is subjected to unexpected tensile force, thereby solving the problem caused by local stress concentration in the prior art.

[0046] Second implementation method:

[0047] This embodiment adds a monitoring patch 5 to the first embodiment, while the rest remains the same as the first embodiment.

[0048] like Figures 8-10A monitoring patch 5 is attached to the outer end of the branch protection layer 22. The monitoring patch 5 includes two substrates 51 bonded to the surface of the branch protection layer 22, two hard pressure-sensitive tubes 52 respectively connected inside the substrates 51, and an air sac 53 located in the limiting groove. An elastic connecting tube 501 connects the air sac 53 and the hard pressure-sensitive tubes 52. The elastic connecting tube 501 is movably embedded in the branch protection layer 22 and connects the hard pressure-sensitive tubes 52 and the air sac 53. The hard pressure-sensitive tubes 52 and the air sac 53 are saturated with air. The inner wall of the hard pressure-sensitive tube 52 is coated with a force-sensitive color-changing coating. The substrates 51 and the hard pressure-sensitive tubes 52 are both transparent. When the branch cable 12 is subjected to a large tensile force, such as... Figure 11 The linkage 41 moves along with the outer limit section 31, and the buffer ring 6 gradually approaches the inner wall of the limit groove, causing the buffer ring 6 to be squeezed and moved, thereby squeezing the air accumulator 53. The air inside is squeezed and spreads rapidly along the elastic connecting pipe 501 towards the hard pressure sensing pipe 52. The greater the force, the faster the branch cable 12 moves, and the faster the air moves into the hard pressure sensing pipe 52, resulting in a more obvious color change of the force-induced color-changing coating on its inner wall. Based on this color change, it can serve as a reminder to the on-site staff of the unexpected force at this location, making it convenient for the staff to check whether there is any abnormality at this location in a timely manner, and effectively avoiding the situation where the corresponding emergency lighting cannot be lit normally after installation.

[0049] A buffer ring 6 is also placed in the limiting groove. The buffer ring 6 is located on the side of the air accumulator 53 away from the outer limiting section 31. The buffer ring 6 is used to protect the air accumulator 53, so that the air accumulator 53 is not prone to significant volume change when the branch cable 12 is subjected to a small force, thereby making it less likely that the force-induced color-changing coating in the hard pressure-sensitive tube 52 will be prematurely triggered.

[0050] It is worth noting that the color-changing coating is made of irreversible color-changing material, so that after accidental stress and the hard pressure tube 52 shows obvious color change, it is not easy to disappear. This effectively ensures the effect of reminding installers of accidental stress at that location. In addition, during subsequent routine maintenance of the line, the color change can be used to focus on the maintenance of some branch cables 12 that have been accidentally stressed.

[0051] In summary, with the monitoring sticker 5 set up, the unexpected stress conditions at each branch node of the main cable 11 and branch cable 12 can be effectively recorded, which makes it easier to identify and repair areas with greater stress during installation, thereby reducing the occurrence of situations where some emergency lights or other lights fail to turn on only after installation.

[0052] The third implementation method:

[0053] This embodiment adds an isolation ring 7 and its related structures to the second embodiment, while the rest remains the same as the second embodiment.

[0054] like Figure 12 An isolation ring 7 is fixedly connected to the middle of the air bladder 53. Two hard pressure-sensitive tubes 52 are set in the substrate 51. Correspondingly, two elastic connecting tubes 501 are also set. The isolation ring 7 divides the air bladder 53 into two independent spaces. At the same time, the two hard pressure-sensitive tubes 52 can also change color independently when subjected to tensile force. When the force is small, only the hard pressure-sensitive tube 52 on the side away from the deflector block 3 can be triggered to change color visually. It also has the effect that the greater the force, the more obvious the color change. Only when the force is too great can the isolation ring 7 be split, thereby triggering the other hard pressure-sensitive tube 52 to also change color. Based on this, the visual reminder of excessive force is more obvious than the second implementation method, making the reminder effect better.

[0055] like Figure 13 The isolation ring 7 includes a fixed ring 72 fixedly connected to the inner wall of the air accumulator 53 near the guide section 421, and a pre-separation ring 71 fixedly connected to the inner wall of the air accumulator 53 away from the guide section 421. The pre-separation ring 71 is located on the side of the fixed ring 72 near the outer limiting section 31. Multiple through holes 701 are drilled on the fixed ring 72, and each through hole 701 is press-fitted with a plug 73. The plug 73 is fixedly connected to the pre-separation ring 71. Figure 14 When the branch cable 12 is subjected to excessive tensile force, the moving speed and impact force of the linkage 41 toward the air accumulator 53 will be too great, causing the gas in the air accumulator 53 to be rapidly compressed. Some of the air enters the hard pressure sensing tube 52 along the elastic connecting tube 501, while some of the compressed gas that does not have time to enter the elastic connecting tube 501 will act on the isolation ring 7, pushing the pre-separation ring 71 through multiple plugs 73 until the pre-separation ring 71 moves away from the fixed ring 72, thereby causing the plugs 73 to detach from the fixed ring 72. At this time, this part of the gas can directly enter between the pre-separation ring 71 and the fixed ring 72, thereby generating a larger area of ​​pushing force on the isolation ring 7 until the two are completely separated. At this time, the air in the other part of the air accumulator 53 can be squeezed and injected into the corresponding hard pressure sensing tube 52, causing it to change color. During cable laying, the construction personnel can be reminded of the approximate stress situation at the branch cable 12 by whether both hard pressure sensing tubes 52 change color.

[0056] Both the pre-separation ring 71 and the fixed ring 72 have L-shaped cross sections, and the two L-shaped structures are arranged opposite each other. The radial surfaces of the pre-separation ring 71 and the fixed ring 72 do not contact each other, and their circumferential surfaces are interference-fitted. The length of the plug 73 located in the through hole 701 is no more than 1 / 4 of the length of the through hole 701, so that it is not easy to generate excessive resistance to the separation of the pre-separation ring 71 and the fixed ring 72.

[0057] The above description is merely a preferred embodiment of the present invention; it encompasses all the protection scope of the present invention. Any equivalent substitutions or modifications made by those skilled in the art within the technical scope disclosed in the present invention, based on the technical solutions and improved concepts of the present invention, should be covered within the protection scope of the present invention.

Claims

1. A crosslinked insulated power cable for emergency lighting circuits, comprising a trunk cable (11) and a branch cable (12) electrically connected to each other, the trunk cable (11) and the branch cable (12) being respectively wrapped with a trunk protective layer (21) and a branch protective layer (22) on the outer parts close to each other, and the trunk protective layer (21) and the branch protective layer (22) being fixedly connected to each other, characterized in that: An adaptive component is provided at one end of the branch protection layer (22) away from the connection between the main cable (11) and the branch cable (12). The adaptive component includes a deflector block (3), a plurality of linkage bars (41) fixedly connected to the outer wall of the deflector block (3), and a plurality of pre-reset bars (42) fixedly connected between the linkage bars (41) and the outer surface of the branch protection layer (22). The deflector block (3) includes an outer limiting section (31) fixedly connected to the outer end of the branch cable (12) and an inner moving section (32) fixedly connected to the outer limiting section (31) near the branch protection layer (22). The branch protection layer (22) near the deflector block (3) has a moving line groove (201) drilled in the end. The portion of the cable core (13) of the branch cable (12) located in the moving line groove (201) is spiral.

2. The cross-linked insulated power cable for emergency lighting circuits according to claim 1, characterized in that: The moving groove (201) is divided into three sections. The inner wall of the middle section is spherical, and the other two sections are cylindrical. The inner wall of the cylindrical section near the outer limiting section (31) has the same diameter as the inner wall of the spherical section. The end of the inner moving section (32) is a spherical structure, and the end of the inner moving section (32) matches the middle of the moving groove (201).

3. The cross-linked insulated power cable for emergency lighting circuits according to claim 1, characterized in that: The inner wall of the linkage bar (41) is chiseled with a limiting groove, and the pre-reset bar (42) includes a guide section (421) fixedly connected to the outer wall of the branch protection layer (22) and a pre-extension section (422) fixedly connected between the end of the guide section (421) and the inner wall of the limiting groove near the deflector block (3).

4. The cross-linked insulated power cable for emergency lighting circuits according to claim 3, characterized in that: The guide section (421) is a rigid, fixed structure, and the pre-elongated section (422) is an elastic structure. When the outer limiting section (31) and the branch protective layer (22) come into contact with each other, the part of the connecting strip (41) corresponding to the pre-elongated section (422) is an elastic structure, and the other parts of the connecting strip (41) are all rigid structures.

5. A cross-linked insulated power cable for emergency lighting circuits according to claim 4, characterized in that: The guide section (421) is also fixedly connected to the outer end of the pre-elongation section (422) with a positioning ring (401). The outer diameter of the positioning ring (401) is larger than the inner diameter of the opening of the limiting groove on the side away from the outer limiting section (31).

6. A cross-linked insulated power cable for emergency lighting circuits according to claim 5, characterized in that: The outer end of the branch protection layer (22) is also attached with a monitoring patch (5). The monitoring patch (5) includes two substrates (51) bonded to the surface of the branch protection layer (22), two hard pressure tubes (52) respectively connected inside the substrates (51), and an air sac (53) located in the limiting groove. An elastic connecting tube (501) is connected between the air sac (53) and the hard pressure tubes (52). The elastic connecting tube (501) is movably embedded in the branch protection layer (22), and the elastic connecting tube (501) connects the hard pressure tubes (52) and the air sac (53). The hard pressure tubes (52) and the air sac (53) are saturated with air.

7. A cross-linked insulated power cable for emergency lighting circuits according to claim 6, characterized in that: A buffer ring (6) is also placed in the limiting groove. The buffer ring (6) is located on the side of the air sac (53) away from the outer limiting section (31). The inner wall of the hard pressure tube (52) is coated with a force-sensitive color-changing coating. Both the substrate (51) and the hard pressure tube (52) are transparent.

8. A cross-linked insulated power cable for emergency lighting circuits according to claim 7, characterized in that: An isolation ring (7) is fixedly connected to the middle of the air sac (53), two hard pressure tubes (52) are provided in the substrate (51), and two elastic connecting tubes (501) are also provided.

9. A cross-linked insulated power cable for emergency lighting circuits according to claim 8, characterized in that: The isolation ring (7) includes a fixed ring (72) fixedly connected to the inner wall of the air sac (53) near the guide section (421) and a pre-separation ring (71) fixedly connected to the inner wall of the air sac (53) away from the guide section (421). The pre-separation ring (71) is located on the side of the fixed ring (72) near the outer limit section (31). The fixed ring (72) has multiple through holes (701) drilled on it. Each of the multiple through holes (701) is fitted with a plug (73) with an interference fit. The plug (73) is fixedly connected to the pre-separation ring (71).

10. A cross-linked insulated power cable for emergency lighting circuits according to claim 9, characterized in that: The pre-separation ring (71) and the fixed ring (72) both have L-shaped cross sections, and the two L-shaped structures are arranged opposite to each other. The radial surfaces of the pre-separation ring (71) and the fixed ring (72) do not contact each other, and their circumferential surfaces are interference-fitted. The length of the plug (73) located in the through hole (701) is no more than 1 / 4 of the length of the through hole (701).

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