Fire resistant shielded low voltage power cable

Abstract

This invention discloses a fire-resistant shielded low-voltage power cable, relating to the field of power cable technology. It includes two insulating outer sheaths, each with a fire-resistant layer inside. An inner bushing is fitted inside the fire-resistant layer, and a conductor is installed inside the inner bushing. A thermosensitive mechanical separation mechanism is provided between the two insulating outer sheaths. This mechanism includes a cable sealing end sleeve. The invention has a scientifically sound and reasonable structure, is safe and convenient to use, and features a thermosensitive mechanical separation mechanism. The cable sealing end sleeve facilitates the fixing of the plug end cap, male plug, and male conductive terminal to both ends of the cable, and electrically connects the male conductive terminal to the cable conductor. Simultaneously, the cooperation of the intermediate connecting body, mechanism mounting ring, guide bushing, and axial retaining ring secures the high-pressure air chamber and pneumatic drive bladder, and allows the insertion of a locking ring for easy docking of the two cables.

Description

Technical Field

[0001] This invention relates to the field of power cable technology, specifically to a fire-resistant shielded low-voltage power cable. Background Technology

[0002] Cables are conductors that transmit electrical energy. They are divided into bare wires, electromagnetic wires, and insulated wires. Bare wires have no insulation layer and include copper and aluminum flat wires, overhead stranded wires, and various profiles. They are mainly used for outdoor overhead and indoor busbars and switch boxes. For example, a low-smoke, environmentally friendly, fire-resistant, low-voltage power cable is disclosed in application number CN202420829664.8. This patent enhances the heat resistance of the low-voltage power cable through a reinforcing layer, making the low-voltage power cable less likely to be ignited.

[0003] However, current power cables cannot completely prevent combustion. In the event of an accidental fire, the flames can still spread along the cable, and the burning cable cannot be separated in time by physical methods. Therefore, in order to avoid the above-mentioned technical problems, it is indeed necessary to provide a fire-resistant shielded low-voltage power cable to overcome the defects in the existing technology. Summary of the Invention

[0004] This invention provides a fire-resistant shielded low-voltage power cable, which can effectively solve the problem mentioned in the background art that power cables cannot completely prevent combustion. In the event of an accidental fire, the flame can still spread along the cable and the burning cable cannot be separated in time by physical methods.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a fire-resistant shielded low-voltage power cable, comprising two insulating outer sheaths, wherein a fire-resistant layer is sleeved inside the insulating outer sheath, an inner bushing is sleeved on the inner wall of the fire-resistant layer, and a conductor is installed inside the inner bushing; a thermosensitive mechanical separation mechanism is provided between the two insulating outer sheaths, wherein the thermosensitive mechanical separation mechanism includes a cable sealing end sleeve.

[0006] Both of the aforementioned insulating outer sheaths are fitted with cable sealing end sleeves. One end of each cable sealing end sleeve is snapped with a plug end cap. A plug male connector is snapped with inside the plug end cap. A terminal receiving cavity is opened inside the plug male connector, and a male conductive terminal is installed inside the terminal receiving cavity.

[0007] A mechanism mounting ring is connected between each of the two plug-in end caps, and an intermediate connecting body is snapped between the two mechanism mounting rings. A female conductive terminal is installed inside the intermediate connecting body.

[0008] Guide bushings are installed at both ends of the intermediate connector, and axial retaining rings are sleeved on the outer side of the guide bushings. Locking rings are engaged between the guide bushings and the mechanism mounting ring inside the plug end cover.

[0009] According to the above technical solution, one end of the male conductive terminal is connected to one end of the conductor through the plug-in end cap, the outer side of the axial retaining ring is connected to the inner wall of the mechanism mounting ring, one end of the male conductive terminal is embedded inside the female conductive terminal, and a slot is provided on the outer side of the locking ring.

[0010] According to the above technical solution, a mechanism partition is symmetrically sleeved on the outer side of the mechanism mounting ring, and a locking mechanism box is equidistantly installed inside the mechanism partition. A locking telescopic connecting rod is symmetrically snapped into one end of the inner wall of the locking mechanism box, and a transmission slider is snapped into one end of the locking telescopic connecting rod. A locking return spring is snapped into the outer side of the corresponding locking telescopic connecting rod between the transmission slider and the locking mechanism box.

[0011] The bottom end of the transmission slider is engaged with a driven slide plate, and the bottom end of the driven slide plate is engaged with a piston push ring between the guide bushing and the mechanism mounting ring.

[0012] The locking mechanism box has a main locking tongue slidably connected to the other side, and both the main locking tongue and the driven slide plate are engaged with hinged supports. Both hinged supports are rotatably connected with a linkage swing plate.

[0013] According to the above technical solution, a groove is provided on the outer side of the mechanism mounting ring corresponding to the inner side of the locking mechanism box. Both ends of the driven slide plate are slidably connected to the inner wall of the groove, and the curvature of the inner wall of the driven slide plate is equal to the curvature of the inner wall of the mechanism mounting ring. The outer side and inner wall of the piston push ring are slidably fitted to the inner wall of the mechanism mounting ring and the outer side of the guide bushing, respectively.

[0014] According to the above technical solution, the bottom end of the main locking tongue is inserted into the outer groove of the locking ring, and the curvature of the bottom end of the main locking tongue is equal to the curvature of the inner wall of the outer groove of the locking ring.

[0015] According to the above technical solution, a high-pressure air chamber is installed between the guide bushing and the mechanism mounting ring on the side corresponding to the piston push ring. A thermal pressure relief pipe is equidistantly connected to one end of the high-pressure air chamber, and a hot melt valve core is installed inside the thermal pressure relief pipe. A pneumatic drive bladder is connected to one end of the thermal pressure relief pipe.

[0016] One end of the thermal pressure relief pipe is snapped with a heat conduction rod, and heat equalization conduits are installed at equal intervals inside the inner liner.

[0017] The inner wall of the guide bushing and the inner wall of the plug end cap are both equidistantly fitted with a separation main spring, and the other end of the separation main spring is fitted with a thrust bearing ring.

[0018] According to the above technical solution, the high-pressure gas chamber is filled with compressed gas, one end of the heat conduction rod is embedded in the heat-spreading conduit, the other end of the heat conduction rod passes through the heat-sensitive pressure relief pipe and is connected to one end of the hot melt valve core, the thrust bearing ring on the guide bushing and the plug end cover are in contact, and the hot melt valve core is made of fusible alloy.

[0019] According to the above technical solution, an anti-loosening locking mechanism is provided on the outside of the intermediate connecting body, and the anti-loosening locking mechanism includes an auxiliary mechanism ring;

[0020] An auxiliary mechanism ring is symmetrically sleeved on the outside of the intermediate connecting body, and an outer protective cover is snapped onto the outside of the auxiliary mechanism ring. The outer protective cover has movable component slots at equal intervals at both ends.

[0021] The top of the locking mechanism box is equidistantly connected to an auxiliary locking rod, and an auxiliary lock return spring is sleeved on the outside of the auxiliary locking rod corresponding to the inside of the locking mechanism box. A lock block mounting plate is snapped onto the top of the auxiliary locking rod, and an anti-loosening lock block is snapped onto the bottom of the lock block mounting plate. An auxiliary locking ring is snapped onto the outside of the plug-in end cover corresponding to the inside of the anti-loosening lock block.

[0022] The inner walls of the two mechanism partitions are symmetrically connected with two adjacent locking mechanism boxes, and a separation auxiliary spring is sleeved on the outside of the ejection guide rod. A separation thrust ring is snapped into one end of the ejection guide rod.

[0023] According to the above technical solution, the inner wall of the outer protective cover is in contact with the outer side of the mechanism partition, the outer side of the lock block mounting plate is in contact with the inner wall of the moving part groove, and the top of the auxiliary locking ring is symmetrically provided with inclined surfaces.

[0024] According to the above technical solution, the outer side of the separation thrust ring is slidably fitted with the outer side of the mechanism mounting ring, the outer diameter of the separation thrust ring is smaller than the inner diameter of the anti-loosening locking block, and one end of the two adjacent ejector guide rods is clamped with a baffle.

[0025] Compared with the prior art, the beneficial effects of the present invention are: the present invention has a scientific and reasonable structure and is safe and convenient to use.

[0026] 1. A thermally sensitive mechanical separation mechanism is set up, which can easily fix the plug end cap, plug male and male conductive terminals to both ends of the cable through the cable sealing end sleeve, and make the male conductive terminals electrically connected to the cable conductor. At the same time, the high-pressure air chamber and the pneumatic drive bladder are fixed by the cooperation of the intermediate connecting body, mechanism mounting ring, guide bushing and axial retaining ring. The locking ring can be inserted to facilitate the docking of two cables. The modular structure is realized, which facilitates disassembly and replacement and improves convenience.

[0027] The locking and return spring pushes the transmission slider and the driven slide to slide, and in conjunction with the hinge support and the linkage swing plate, it moves the main locking tongue up and down, which facilitates the limiting of the locking ring and improves the stability of the connection.

[0028] Through the cooperation of the heat conduction rod, heat distribution conduit, high-pressure air chamber, heat-sensitive pressure relief pipe, heat fusion valve core, and pneumatic drive bladder, when a section of cable catches fire, heat is evenly transferred to the heat fusion valve core, causing it to melt. This facilitates the filling of the pneumatic drive bladder with air pressure, causing it to expand and push the piston push ring and driven slide plate to move. Through power transmission, the main locking tongue is pushed upward, releasing the limit on the locking ring. This allows the compression and separation main spring to reset, causing the thrust bearing ring to extend and push out the locking ring. As a result, the burning cable is isolated, achieving reliable early physical isolation of the fire and preventing the fire from spreading along the outside of the cable.

[0029] 2. An anti-loosening locking mechanism is set up. With the cooperation of the auxiliary locking rod, the main locking tongue is raised and lowered, pushing the locking block mounting plate and the anti-loosening locking block to rise and fall together, which facilitates the insertion of the plug end cover. Then, the auxiliary lock return spring is extended and retracted to help push the main locking tongue down, which improves the limit of the main locking tongue on the locking ring. At the same time, the auxiliary locking rod pulls the locking block mounting plate and the anti-loosening locking block down, and cooperates with the auxiliary locking ring to limit the plug end cover, forming a double mechanical lock and increasing the stability of the connection.

[0030] In the event of a fire, the expansion of the pneumatically driven bladder can unlock the entire system at once. Then, the pre-compressed separation auxiliary spring and separation thrust ring work together to generate a push-out force, which assists in the separation of the main spring. Together, they push the plug end cap and plug male connector to separate from the mechanism mounting ring, ensuring that the cables at both ends are quickly and completely released, preventing them from sticking together and stopping the fire from spreading.

[0031] In summary, by combining the thermally sensitive mechanical separation mechanism and the anti-loosening locking mechanism, a highly reliable cable fire safety system is constructed, integrating stable connection, intelligent sensing, and active separation. During normal operation, the dual mechanical locks provide vibration and pulling resistance. In fire emergencies, it can react quickly and decisively to physically isolate the cable without the need for external energy or complex control circuits. Even under extreme fire conditions such as power outages and signal interruptions, it can still separate the cable to prevent the spread of fire. At the same time, the modular design allows for the disassembly and replacement of components, improving convenience. Attached Figure Description

[0032] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention and do not constitute a limitation thereof.

[0033] In the attached diagram:

[0034] Figure 1 This is a schematic diagram of the structure of the present invention;

[0035] Figure 2 This is a schematic diagram of the installation structure of the auxiliary locking ring of the present invention;

[0036] Figure 3 This is a schematic diagram of the installation structure of the male connector of the present invention;

[0037] Figure 4 This is a schematic diagram of the installation structure of the guide bushing of the present invention;

[0038] Figure 5 This is a schematic diagram of the structure of the thermosensitive mechanical separation mechanism of the present invention;

[0039] Figure 6 This is a schematic diagram of the mounting structure of the female conductive terminal of the present invention;

[0040] Figure 7 This is a schematic diagram of the installation structure of the heat dissipation conduit of the present invention;

[0041] Figure 8 This is a schematic diagram of the anti-loosening locking mechanism of the present invention;

[0042] Figure 9 This is a schematic diagram of the installation structure of the separation thrust ring of the present invention.

[0043] The diagram labels are: 1. Insulating outer sheath; 2. Fire-resistant layer; 3. Inner liner; 4. Conductor;

[0044] 5. Thermally sensitive mechanical separation mechanism; 501. Cable sealing end sleeve; 502. Plug-in end cover; 503. Male plug-in connector; 504. Terminal receiving cavity; 505. Male conductive terminal; 506. Mechanism mounting ring; 507. Intermediate connecting body; 508. Female conductive terminal; 509. Axial retaining ring; 510. Guide bushing; 511. Locking circlip; 512. Mechanism partition; 513. Locking mechanism box; 514. Locking mechanism. 515. Telescopic linkage; 516. Transmission slider; 517. Locking and return spring; 518. Driven slide plate; 519. Piston push ring; 520. Hinge support; 521. Main locking tongue; 522. Linkage swing plate; 523. High-pressure air chamber; 524. Thermosensitive pressure relief pipe; 525. Hot melt valve core; 526. Pneumatic drive bladder; 527. Heat conduction rod; 528. Heat dissipation conduit; 529. Separation main spring; 520. Thrust bearing ring;

[0045] 6. Anti-loosening locking mechanism; 601. Auxiliary mechanism ring; 602. Outer protective cover; 603. Moving part slot; 604. Auxiliary locking rod; 605. Auxiliary lock return spring; 606. Lock block mounting plate; 607. Anti-loosening locking block; 608. Auxiliary locking ring; 609. Ejection guide rod; 610. Separation auxiliary spring; 611. Separation thrust ring. Detailed Implementation

[0046] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0047] Example: Figure 1-9 As shown, the present invention provides a technical solution, a fire-resistant shielded low-voltage power cable, including two insulating outer sheaths 1, a fire-resistant layer 2 is sleeved inside the insulating outer sheath 1, an inner bushing 3 is sleeved on the inner wall of the fire-resistant layer 2, and a conductor 4 is installed inside the inner bushing 3. A thermally sensitive mechanical separation mechanism 5 is provided between the two insulating outer sheaths 1.

[0048] The thermally sensitive mechanical separation mechanism 5 includes a cable sealing end sleeve 501, a plug-in end cover 502, a plug-in male connector 503, a terminal receiving cavity 504, a male conductive terminal 505, a mechanism mounting ring 506, an intermediate connecting body 507, a female conductive terminal 508, an axial retaining ring 509, a guide bushing 510, a locking ring 511, a mechanism partition 512, a locking mechanism box 513, a locking telescopic connecting rod 514, a transmission slider 515, a locking return spring 516, a driven sliding plate 517, a piston push ring 518, a hinge support 519, a main locking tongue 520, a linkage swing plate 521, a high-pressure air chamber 522, a thermally sensitive pressure relief pipe 523, a hot melt valve core 524, a pneumatic drive bladder 525, a heat conduction rod 526, a heat-spreading conduit 527, a separation main spring 528, and a thrust bearing ring 529.

[0049] Two insulating outer sheaths 1 are each fitted with a cable sealing end sleeve 501. One end of the cable sealing end sleeve 501 is snapped with a plug end cap 502. The plug end cap 502 is snapped with a plug male connector 503 inside. The plug male connector 503 has a terminal receiving cavity 504 inside, and a male conductive terminal 505 is installed inside the terminal receiving cavity 504.

[0050] A mechanism mounting ring 506 is connected between the two plug-in end caps 502, and an intermediate connector 507 is snapped between the two mechanism mounting rings 506. A female conductive terminal 508 is installed inside the intermediate connector 507.

[0051] Guide bushings 510 are installed at both ends of the intermediate connector 507, and an axial retaining ring 509 is sleeved on the outside of the guide bushing 510. A locking ring 511 is engaged between the guide bushing 510 and the mechanism mounting ring 506 inside the plug end cover 502. In order to make the connection conductive, one end of the male conductive terminal 505 passes through the plug end cover 502 and is connected to one end of the conductor 4. The outer side of the axial retaining ring 509 is connected to the inner wall of the mechanism mounting ring 506. One end of the male conductive terminal 505 is embedded in the female conductive terminal 508. A slot is opened on the outer side of the locking ring 511.

[0052] A mechanism partition plate 512 is symmetrically sleeved on the outer side of the mechanism mounting ring 506. A locking mechanism box 513 is installed equidistantly inside the mechanism partition plate 512. A locking telescopic connecting rod 514 is symmetrically snapped onto one end of the inner wall of the locking mechanism box 513, and a transmission slider 515 is snapped onto one end of the locking telescopic connecting rod 514. A locking return spring 516 is snapped onto the outer side of the corresponding locking telescopic connecting rod 514 between the transmission slider 515 and the locking mechanism box 513.

[0053] The bottom end of the transmission slider 515 is engaged with the driven slide plate 517. The bottom end of the driven slide plate 517 is engaged with the guide bushing 510 and the mechanism mounting ring 506. In order to facilitate the sliding of the driven slide plate 517, a groove is provided on the outer side of the mechanism mounting ring 506 corresponding to the inner side of the locking mechanism box 513. Both ends of the driven slide plate 517 are slidably connected to the inner wall of the groove, and the curvature of the inner wall of the driven slide plate 517 is equal to the curvature of the inner wall of the mechanism mounting ring 506. The outer side and inner wall of the piston push ring 518 are slidably fitted with the inner wall of the mechanism mounting ring 506 and the outer side of the guide bushing 510, respectively.

[0054] The locking mechanism box 513 has a main locking tongue 520 slidably connected to the other side, and the top of the main locking tongue 520 and the driven slide plate 517 are both engaged with hinged supports 519. The two hinged supports 519 are rotatably connected with a linkage swing plate 521. In order to position, the bottom end of the main locking tongue 520 is inserted into the outer groove of the locking ring 511, and the curvature of the bottom end of the main locking tongue 520 is equal to the curvature of the inner wall of the outer groove of the locking ring 511.

[0055] A high-pressure air chamber 522 is installed on one side of the piston push ring 518 between the guide bushing 510 and the mechanism mounting ring 506. A thermal pressure relief pipe 523 is equidistantly connected to one end of the high-pressure air chamber 522, and a hot melt valve core 524 is installed inside the thermal pressure relief pipe 523. A pneumatic drive bladder 525 is connected to one end of the thermal pressure relief pipe 523.

[0056] One end of the heat-sensitive pressure relief pipe 523 is snapped with a heat conduction rod 526, and heat-equalizing conduits 527 are installed at equal intervals inside the inner liner 3.

[0057] The inner wall of the guide bushing 510 and the inner wall of the plug end cap 502 are both equidistantly clamped with the main separation spring 528, and the other end of the main separation spring 528 is clamped with the thrust bearing ring 529. In order to facilitate the expansion of the pneumatic drive bladder 525, the high-pressure air chamber 522 is filled with compressed gas. One end of the heat conduction rod 526 is embedded in the heat-spreading conduit 527, and the other end of the heat conduction rod 526 passes through the heat-sensitive pressure relief pipe 523 and is connected to one end of the hot melt valve core 524. The thrust bearing ring 529 on the guide bushing 510 and the plug end cap 502 are in contact with each other. The hot melt valve core 524 is made of fusible alloy.

[0058] An anti-loosening locking mechanism 6 is provided on the outer side of the intermediate connecting body 507;

[0059] The anti-loosening locking mechanism 6 includes an auxiliary mechanism ring 601, an outer protective cover 602, a moving part groove 603, an auxiliary locking rod 604, an auxiliary lock return spring 605, a lock block mounting plate 606, an anti-loosening lock block 607, an auxiliary locking ring 608, an ejector guide rod 609, a separation auxiliary spring 610, and a separation thrust ring 611.

[0060] An auxiliary mechanism ring 601 is symmetrically sleeved on the outside of the intermediate connecting body 507. An outer protective cover 602 is snapped onto the outside of the auxiliary mechanism ring 601. Both ends of the outer protective cover 602 are provided with movable part slots 603 at equal intervals.

[0061] An auxiliary locking rod 604 is equidistantly connected to the top of the locking mechanism box 513. An auxiliary lock return spring 605 is sleeved on the outside of the auxiliary locking rod 604 corresponding to the inside of the locking mechanism box 513. A lock block mounting plate 606 is snapped onto the top of the auxiliary locking rod 604. An anti-loosening lock block 607 is snapped onto the bottom of the lock block mounting plate 606. An auxiliary locking ring 608 is snapped onto the outside of the plug-in end cover 502 corresponding to the inside of the anti-loosening lock block 607. In order to limit the plug-in end cover 502, the inner wall of the outer protective cover 602 is in contact with the outer side of the mechanism partition 512, and the outer side of the lock block mounting plate 606 is in contact with the inner wall of the movable part groove 603. The top of the auxiliary locking ring 608 is symmetrically provided with inclined surfaces.

[0062] Two ejector guide rods 609 are symmetrically connected between the inner walls of the two mechanism partitions 512 and the two adjacent locking mechanism boxes 513. A separation auxiliary spring 610 is sleeved on the outer side of the ejector guide rod 609. A separation thrust ring 611 is snapped into one end of the ejector guide rod 609. In order to facilitate the ejection of the plug end cover 502, the outer side of the separation thrust ring 611 slides against the outer side of the mechanism mounting ring 506. The outer diameter of the separation thrust ring 611 is smaller than the inner diameter of the anti-loosening locking block 607. A baffle is snapped into one end of the two adjacent ejector guide rods 609.

[0063] The working principle and usage process of this invention are as follows: First, the high-pressure air chamber 522 and the air pressure driving bladder 525 are filled between the mechanism mounting ring 506 and the guide bushing 510. Then, through the cooperation of the axial retaining ring 509, the mechanism mounting ring 506 and the guide bushing 510 are fixed on both sides of the intermediate connector 507, thus completing the installation of the docking assembly. The two ends of the cable are fixed to the plug end cover 502 through the cooperation of the cable sealing end sleeve 501, which facilitates the sealing of the cable and provides convenience for subsequent connections.

[0064] Next, the male connector 503 is inserted into the guide bushing 510, forcing one end of the female conductive terminal 508 into the terminal receiving cavity 504, while one end of the male conductive terminal 505 is inserted into the female conductive terminal 508, ensuring the effect of power transmission. The heat conduction rod 526 is also inserted into the heat distribution pipe 527 at the same time to facilitate the transfer of heat.

[0065] Next, when the male connector 503 is inserted into the guide bushing 510, the locking ring 511 inside the plug end cover 502 is inserted between the mounting ring 506 and the guide bushing 510. The main locking tongue 520 is pushed up by the inclined surface at one end of the locking ring 511. At the same time, through the cooperation of the hinge support 519 and the linkage swing plate 521, the transmission slider 515, the driven slide plate 517 and the piston push ring 518 are pulled to slide, so that the locking telescopic linkage 514 is extended, which makes it easier to release the limit and let one end of the locking ring 511 pass through the bottom end of the main locking tongue 520.

[0066] When one end of the locking ring 511 is in contact with one end of the axial retaining ring 509, the main locking tongue 520 loses support. Then, through the extension and retraction characteristics of the locking return spring 516, the transmission slider 515 and the driven slide plate 517 are pushed to slide back to their original positions, causing the locking telescopic linkage 514 to retract. Then, through the cooperation of the hinge support 519 and the linkage swing plate 521, the main locking tongue 520 is pulled down, forcing the bottom end of the main locking tongue 520 to be embedded in the groove on the outside of the locking ring 511. This limits the locking ring 511 and the plug-in end cover 502, ensuring stable and convenient docking.

[0067] Simultaneously, during the lifting and lowering of the main bolt 520, the auxiliary locking rod 604, the locking block mounting plate 606, and the anti-loosening locking block 607 are pushed upward together, forcing the auxiliary lock return spring 605 to contract and release the obstruction, making it convenient for the plug-in end cover 502 to slide with the auxiliary locking ring 608. When the main bolt 520 descends and resets, the auxiliary locking rod 604 lowers and resets the locking block mounting plate 606 and the anti-loosening locking block 607, so that the anti-loosening locking block 607 and the auxiliary locking ring 608 cooperate to block and limit the plug-in end cover 502, further improving the stability of the connection. At the same time, the elasticity of the auxiliary lock return spring 605 is used to increase the pushing force on the main bolt 520 to descend, making it easier for the main bolt 520 to insert into the slot on the outside of the locking ring 511.

[0068] When a section of cable catches fire, the flames burn and the temperature rises rapidly. Using the heat conduction rod 526 and the heat-spreading conduit 527, the increased heat is guided to the hot melt valve core 524 inside the heat-sensitive pressure relief pipe 523. When the hot melt valve core 524 reaches its melting point, it melts, releasing the seal on the heat-sensitive pressure relief pipe 523. This allows the compressed gas inside the high-pressure air chamber 522 to quickly fill the pneumatic drive bladder 525 through the heat-sensitive pressure relief pipe 523, causing the pneumatic drive bladder 525 to expand. This, in turn, pushes the piston push ring 518 and the driven slide plate 517 to move. Through the cooperation of the linkage swing plate 521, it pushes the main locking tongue 520 upward, releasing the limit on the locking ring 511.

[0069] At the same time, the expansion of the pneumatic drive bladder 525 causes the main locking tongue 520 to rise, pushing the auxiliary locking rod 604, the locking block mounting plate 606 and the anti-loosening locking block 607 to rise, thus releasing the restriction on the auxiliary locking ring 608.

[0070] Finally, when the limit is released, the compressed separation main spring 528 and separation auxiliary spring 610 extend and reset, pushing the thrust bearing ring 529 and separation thrust ring 611 to move quickly, popping the plug male connector 503 out of the guide bushing 510, thus realizing the automatic separation of the two cable sections and preventing the fire from spreading.

[0071] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A fire-resistant shielded low-voltage power cable, comprising two insulating outer sheaths (1), characterized in that: The insulating outer sheath (1) is fitted with a fire-resistant layer (2), and the inner wall of the fire-resistant layer (2) is fitted with an inner liner (3), and a conductor (4) is installed inside the inner liner (3). A thermosensitive mechanical separation mechanism (5) is provided between the two insulating outer sheaths (1), and the thermosensitive mechanical separation mechanism (5) includes a cable sealing end sleeve (501). Both of the two insulating outer sheaths (1) are fitted with cable sealing end sleeves (501). One end of the cable sealing end sleeve (501) is snapped with a plug end cap (502). A plug male connector (503) is snapped inside the plug end cap (502). A terminal receiving cavity (504) is opened inside the plug male connector (503), and a male conductive terminal (505) is installed inside the terminal receiving cavity (504). A mechanism mounting ring (506) is connected between each of the two plug-in end caps (502), and an intermediate connector (507) is snapped between the two mechanism mounting rings (506). A female conductive terminal (508) is installed inside the intermediate connector (507). The intermediate connector (507) is equipped with guide bushings (510) at both ends, and an axial retaining ring (509) is sleeved on the outside of the guide bushing (510). A locking ring (511) is engaged between the guide bushing (510) and the mechanism mounting ring (506) inside the plug end cover (502). One end of the male conductive terminal (505) passes through the plug end cap (502) and is connected to one end of the conductor (4). The outer side of the axial retaining ring (509) is connected to the inner wall of the mechanism mounting ring (506). One end of the male conductive terminal (505) is embedded inside the female conductive terminal (508). A slot is provided on the outer side of the locking ring (511). The mechanism mounting ring (506) is symmetrically fitted with a mechanism partition (512) on the outside. The mechanism partition (512) is equidistantly fitted with a locking mechanism box (513) inside. A locking telescopic link (514) is symmetrically snapped into one end of the inner wall of the locking mechanism box (513), and a transmission slider (515) is snapped into one end of the locking telescopic link (514). A locking return spring (516) is snapped into the outer side of the corresponding locking telescopic link (514) between the transmission slider (515) and the locking mechanism box (513). The bottom end of the transmission slider (515) is engaged with the driven slide plate (517), and the bottom end of the driven slide plate (517) is engaged with the guide bushing (510) and the mechanism mounting ring (506) with the piston push ring (518). The locking mechanism box (513) has a main locking tongue (520) slidably connected to the other side inside, and the top of the main locking tongue (520) and the driven slide plate (517) are both engaged with hinged supports (519), and the two hinged supports (519) are rotatably connected with a linkage swing plate (521). The outer side of the intermediate connector (507) is provided with an anti-loosening locking mechanism (6), which includes an auxiliary mechanism ring (601). An auxiliary mechanism ring (601) is symmetrically sleeved on the outside of the intermediate connecting body (507), and an outer protective cover (602) is snapped onto the outside of the auxiliary mechanism ring (601). Both ends of the outer protective cover (602) are provided with movable component slots (603) at equal intervals. An auxiliary locking rod (604) is equidistantly connected to the top of the locking mechanism box (513), and an auxiliary lock return spring (605) is sleeved on the outside of the auxiliary locking rod (604) corresponding to the inside of the locking mechanism box (513). A lock block mounting plate (606) is snapped onto the top of the auxiliary locking rod (604), and an anti-loosening lock block (607) is snapped onto the bottom of the lock block mounting plate (606). An auxiliary locking ring (608) is snapped onto the outside of the plug-in end cover (502) corresponding to the inside of the anti-loosening lock block (607). The inner walls of the two mechanism partitions (512) are symmetrically connected to the two adjacent locking mechanism boxes (513) with ejector guide rods (609), and a separation auxiliary spring (610) is sleeved on the outside of the ejector guide rod (609). A separation thrust ring (611) is snapped into one end of the ejector guide rod (609).

2. The fire-resistant shielded low-voltage power cable according to claim 1, characterized in that: The outer side of the mechanism mounting ring (506) is provided with a groove corresponding to the inner side of the locking mechanism box (513). Both ends of the driven slide plate (517) are slidably connected to the inner wall of the groove, and the curvature of the inner wall of the driven slide plate (517) is equal to the curvature of the inner wall of the mechanism mounting ring (506). The outer side and inner wall of the piston push ring (518) are slidably attached to the inner wall of the mechanism mounting ring (506) and the outer side of the guide bushing (510), respectively.

3. The fire-resistant shielded low-voltage power cable according to claim 1, characterized in that: The bottom end of the main locking tongue (520) is inserted into the outer groove of the locking ring (511), and the curvature of the bottom end of the main locking tongue (520) is equal to the curvature of the inner wall of the outer groove of the locking ring (511).

4. The fire-resistant shielded low-voltage power cable according to claim 1, characterized in that: A high-pressure air chamber (522) is installed on one side of the piston push ring (518) between the guide bushing (510) and the mechanism mounting ring (506). A thermal pressure relief pipe (523) is equidistantly connected to one end of the high-pressure air chamber (522), and a hot melt valve core (524) is installed inside the thermal pressure relief pipe (523). A pneumatic drive bladder (525) is connected to one end of the thermal pressure relief pipe (523). One end of the heat-sensitive pressure relief pipe (523) is snapped with a heat conduction rod (526), ​​and heat-spreading conduits (527) are installed at equal intervals inside the inner liner (3). The inner wall of the guide bushing (510) and the inner wall of the plug end cap (502) are both equidistantly fitted with a separation main spring (528), and the other end of the separation main spring (528) is fitted with a thrust bearing ring (529).

5. A fire-resistant shielded low-voltage power cable according to claim 4, characterized in that: The high-pressure gas chamber (522) is filled with compressed gas. One end of the heat conduction rod (526) is embedded in the heat-spreading conduit (527). The other end of the heat conduction rod (526) passes through the heat-sensitive pressure relief pipe (523) and is connected to one end of the hot melt valve core (524). The thrust bearing ring (529) on the guide bushing (510) and the plug end cap (502) are in contact. The hot melt valve core (524) is made of fusible alloy.

6. A fire-resistant shielded low-voltage power cable according to claim 5, characterized in that: The inner wall of the outer protective cover (602) is in contact with the outer side of the mechanism partition (512), the outer side of the lock block mounting plate (606) is in contact with the inner wall of the movable component groove (603), the top of the auxiliary locking ring (608) is symmetrically provided with inclined surfaces, and the bottom end of the auxiliary locking rod (604) is fixedly connected to the top end of the main locking tongue (520).

7. A fire-resistant shielded low-voltage power cable according to claim 5, characterized in that: The outer side of the separation thrust ring (611) slides against the outer side of the mechanism mounting ring (506). The outer diameter of the separation thrust ring (611) is smaller than the inner diameter of the anti-loosening locking block (607). One end of the two adjacent ejector guide rods (609) is clamped with a baffle.

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