Fire extinguishing device for low-voltage network

Abstract

The application relates to a fire-fighting device for a weak current network, which comprises a mounting seat and a docking seat, a movable ring is arranged between the mounting seat and the docking seat, a separation cloth cover is arranged between the movable ring and the mounting seat, the separation cloth cover covers the weak current cabinet when the movable ring is docked in the docking seat; the movable ring is normally sleeved on the peripheral side of the mounting seat, the mounting seat is provided with a limiting assembly for keeping the movable ring on the peripheral side of the mounting seat; a smoke alarm is arranged on the bottom wall of the mounting seat, when the smoke alarm is triggered, the limiting assembly is separated from the movable ring so that the movable ring is lowered to be docked in the docking seat. The fire-fighting device for the weak current network can improve the fire extinguishing efficiency of the weak current cabinet.

Description

Technical Field

[0001] This application relates to the technical field of network fire protection, and in particular to a fire protection device for low-voltage networks. Background Technology

[0002] Under the combined effect of nonlinear loads and line impedance, the power grid in practical applications can no longer be ignored, exhibiting a slight inductive property. Furthermore, when the location of photovoltaic equipment connected to the power grid changes, the inductive reactance of the power grid relative to the common coupling point will also fluctuate. The term "weak power grid" is used to define the power grid under such non-ideal conditions. Commonly used weak electrical equipment includes signal inputs for computers, telephones, and televisions, as well as household appliances such as audio equipment.

[0003] In existing technologies, low-voltage cabinets are usually installed in low-voltage rooms. Currently, fire safety in low-voltage rooms is not given much attention, and they are only equipped with dry powder fire extinguishers and smoke detectors. When a fire occurs in a low-voltage cabinet in the low-voltage room, the smoke detector is triggered, requiring personnel to go to the low-voltage room and extinguish the fire with fire extinguishers. This method is inefficient and therefore requires further improvement. Summary of the Invention

[0004] In order to improve the fire extinguishing efficiency of low-voltage cabinets, this application provides a fire-fighting device for low-voltage networks.

[0005] The fire protection device for low-voltage networks provided in this application adopts the following technical solution:

[0006] A fire protection device for low-voltage networks includes a mounting base for installation on the top of a low-voltage cabinet and a docking seat for installation on the bottom of the low-voltage cabinet. A movable ring is slidably mounted between the mounting base and the docking seat. An isolation cloth cover is provided between the movable ring and the mounting base. When the movable ring is docked with the docking seat, the isolation cloth cover covers the low-voltage cabinet. The movable ring is normally fitted around the periphery of the mounting base so that the isolation cloth cover is stored around the periphery of the mounting base. The mounting base is provided with a limiting component for keeping the movable ring located around the periphery of the mounting base. A smoke detector is provided on the bottom wall of the mounting base. When the smoke detector is triggered, the limiting component disengages from the movable ring so that the movable ring moves down and docks with the docking seat.

[0007] By adopting the above technical solution, through the setting of the mounting base, docking seat, and movable ring, when a fire occurs in the low-voltage cabinet, the smoke alarm is triggered. The limiting component releases the limiting effect on the movable ring, and the movable ring falls onto the docking seat under its own weight. During the downward movement of the movable ring, it can pull the isolation cloth cover stored around the mounting base, forcing the isolation cloth cover to open and cover the low-voltage cabinet. After the movable ring docks with the docking seat, a sealed covering space is formed between the mounting base, the isolation cloth cover, and the docking seat, thereby isolating the low-voltage cabinet from the outside world and preventing outside air from entering the low-voltage cabinet. When the oxygen in the isolation cloth cover is burned out, the fire is extinguished, greatly improving the fire extinguishing efficiency of the low-voltage cabinet.

[0008] Optionally, the top wall of the mounting base is provided with an air extraction pipe, the inlet end of which penetrates the bottom wall of the mounting base; the outlet end of the air extraction pipe is used to connect to an air extraction device.

[0009] By adopting the above technical solution and installing an exhaust pipe, in the event of a fire, the air inside the weak current cabinet is extracted through the exhaust pipe after the isolation cloth cover is placed behind it, thereby reducing the oxygen content inside the isolation cloth cover and achieving a rapid fire extinguishing effect, further improving the fire extinguishing efficiency of the weak current cabinet.

[0010] Optionally, the outer periphery of the isolation cloth cover is provided with a plurality of shaping rings for maintaining the shape of the isolation cloth cover. The plurality of shaping rings are arranged at intervals along the length direction of the isolation cloth cover, and the inner diameter of the shaping rings is larger than the outer diameter of the movable seat.

[0011] By adopting the above technical solution, the shaping ring is used to cover the weak current cabinet. When the air inside the isolation cloth cover is drawn out through the air extraction pipe, the shaping ring can shape the isolation cloth cover, reducing the possibility of the isolation cloth cover deforming inward due to the decrease in air pressure inside the isolation cloth cover. This reduces the possibility of the isolation cloth cover coming into contact with the weak current cabinet due to inward deformation. The inner diameter of the shaping ring is larger than the outer diameter of the movable base, so that when the isolation cloth cover is stored, the shaping ring can be fitted onto the outer peripheral wall of the movable base for storage.

[0012] Optionally, the bottom wall of the mounting base is provided with a sliding groove, and both ends of the sliding groove extend radially along the mounting base; the limiting component includes a limiting arc plate, a return spring, and a pulling member. The limiting arc plate is disposed on the bottom wall of the mounting base and slidably mounted in the sliding groove. The return spring is installed between the sliding groove and the limiting arc plate. The return spring normally causes the limiting arc plate to move away from the center of the mounting base and is supported on the lower end face of the movable ring; the pulling member is disposed on the limiting arc plate to force the limiting arc plate to disengage from the movable ring.

[0013] By adopting the above technical solution, through the setting of the limiting arc plate, the return spring and the pulling component, when the movable ring is stored, the movable ring is sleeved on the outer periphery of the mounting base. Under the action of the return spring, the limiting arc plate moves away from the center of the mounting base and supports the lower end face of the movable ring, thereby limiting the movable ring. In the event of a fire, the pulling component forces the limiting arc plate to move closer to the center of the mounting base to disengage from the lower end face of the movable ring. The movable ring can fall towards the docking seat under its own weight, so that the isolation cloth cover covers the weak current cabinet.

[0014] Optionally, the return spring normally causes the limiting arc plate to move away from the center of the mounting base and form a guide portion protruding from the outer periphery of the mounting base. When the isolation cloth cover is retracted, the guide portion causes the isolation cloth cover to fold outward and be retracted into the outer periphery of the mounting base. The guide portion has a first guide surface. When the movable ring is slidably sleeved on the mounting base, the movable ring abuts against the first guide surface and pushes the limiting arc plate to move closer to the center of the mounting base.

[0015] By adopting the above technical solution, through the setting of the guide part and the first guide surface, the guide part normally protrudes from the outer periphery of the mounting base to push the isolation cloth cover outward. When the movable ring moves towards the side closer to the mounting base to accommodate the isolation cloth cover, the isolation cloth cover can be folded outward under the action of the guide part, thereby being accommodated on the outer periphery of the mounting base. When the movable ring passes through the guide part, the movable ring can push the limiting arc plate through the first guide surface, forcing the limiting arc plate to move towards the center of the mounting base, so that the movable ring can be fitted and accommodated on the outer periphery of the mounting base. After the movable ring is fitted on the outer periphery of the mounting base, the limiting arc plate protrudes from the outer periphery of the mounting base under the action of the return spring and supports the movable ring, thereby limiting the movable ring in the mounting base and improving the convenience of accommodating the movable ring and the isolation cloth cover.

[0016] Optionally, the top wall of the docking seat is provided with a docking groove for the movable ring to be embedded in, the end face of the movable ring near the docking seat is provided with a first sealing ring embedded in the docking groove, and the docking groove is provided with a connecting member for keeping the movable ring embedded in the docking groove.

[0017] By adopting the above technical solution, through the setting of the docking groove and the first sealing ring, when the movable ring moves towards the side of the docking ring to force the isolation cloth cover to be placed on the weak current cabinet, the movable ring can drive the first sealing ring to be embedded in the docking groove, and through the connector, the movable ring is forced to remain embedded in the docking groove, thereby improving the sealing effect between the movable ring and the docking seat and reducing the possibility of outside air entering the isolation cloth cover.

[0018] Optionally, a docking ring is slidably installed in the docking groove, and a first compression spring is provided between the docking ring and the docking groove. The first compression spring normally keeps the upper end surface of the docking ring flush with the upper surface of the docking seat.

[0019] By adopting the above technical solution, through the setting of the docking ring and the first compression spring, the docking ring normally remains flush with the upper surface of the docking seat under the action of the first compression spring, improving the flatness of the upper surface of the docking seat and reducing the possibility of foreign objects falling into the docking groove and causing blockage. When the movable ring is embedded in the docking groove, the movable ring can press the docking ring and force the docking ring to squeeze the first compression spring. The first compression spring deforms and has an elastic force to push the docking ring. The elastic force can force the first sealing ring to be squeezed and deformed, thereby pressing against the peripheral wall of the docking groove and improving the sealing effect of the first sealing ring.

[0020] Optionally, the shape of the docking ring is adapted to the shape of the docking groove, and the peripheral wall of the docking ring is provided with a second sealing ring for abutting against the peripheral wall of the docking groove. When the movable ring is embedded in the docking groove, the docking groove moves toward the side closer to the first compression spring and compresses air into the docking groove.

[0021] By adopting the above technical solution, the second sealing ring creates a closed space in the docking groove. When a fire occurs in the low-voltage cabinet, the air in the docking groove is heated and expands, which further pushes the docking ring towards the side closer to the movable ring, thereby squeezing the first sealing ring, causing the first sealing ring to deform and firmly press against the peripheral wall of the docking groove, further improving the sealing effect of the isolation cloth cover.

[0022] Optionally, the upper surface of the docking seat is provided with a first connecting groove communicating with the docking slot, and the outer peripheral wall of the movable ring is provided with a second connecting groove. When the movable ring is embedded in the docking slot, the first connecting groove and the second connecting groove are arranged opposite to each other. The connecting member includes a snap-fit ​​post and a second compression spring. The snap-fit ​​post is slidably installed in the first connecting groove, and the second compression spring is installed between the first connecting groove and the snap-fit ​​post. The second compression spring normally causes the snap-fit ​​post to be inserted into the second connecting groove.

[0023] By adopting the above technical solution, and with the setting of the snap-fit ​​post and the second compression spring, after the movable ring is embedded in the docking groove, the snap-fit ​​post is inserted into the second connecting groove under the action of the second compression spring, thereby keeping the movable ring in the docking groove and reducing the possibility of the movable ring being dislodged from the docking groove by force.

[0024] Optionally, the isolation cloth cover is an aluminum foil composite fiberglass cloth isolation cloth cover.

[0025] By adopting the above technical solution, the aluminum foil composite fiberglass cloth has good flame retardant and air-impermeable effects, reducing the possibility of outside air entering the isolation cloth cover when it is placed on the low-voltage cabinet, and improving the fire extinguishing efficiency of the low-voltage cabinet.

[0026] In summary, this application includes at least one of the following beneficial technical effects:

[0027] 1. Through the installation base, docking seat, and movable ring, when a fire occurs in the low-voltage cabinet, the smoke alarm is triggered. The limiting component releases the limiting effect on the movable ring, which falls onto the docking seat under its own weight. During the downward movement of the movable ring, it can pull the isolation cloth cover stored around the installation base, forcing the isolation cloth cover to open and cover the low-voltage cabinet. After the movable ring docks with the docking seat, a sealed covering space is formed between the installation base, the isolation cloth cover, and the docking seat, thereby isolating the low-voltage cabinet from the outside world and preventing outside air from entering the low-voltage cabinet. When the oxygen in the isolation cloth cover is burned out, the fire is extinguished, greatly improving the fire extinguishing efficiency of the low-voltage cabinet.

[0028] 2. Through the setting of the guide part and the first guide surface, the guide part normally protrudes from the outer periphery of the mounting base to push the isolation cloth cover outward. When the movable ring moves towards the side closer to the mounting base to accommodate the isolation cloth cover, the isolation cloth cover can be folded outward under the action of the guide part, and thus accommodated on the outer periphery of the mounting base. When the movable ring passes through the guide part, the movable ring can push the limiting arc plate through the first guide surface, forcing the limiting arc plate to move towards the center of the mounting base, so that the movable ring can be fitted and accommodated on the outer periphery of the mounting base. After the movable ring is fitted on the outer periphery of the mounting base, the limiting arc plate protrudes from the outer periphery of the mounting base under the action of the return spring and supports the movable ring, thereby limiting the movable ring in the mounting base and improving the convenience of accommodating the movable ring and the isolation cloth cover.

[0029] 3. By setting the second sealing ring, a closed space is formed in the docking groove. When a fire occurs in the low-voltage cabinet, the air in the docking groove is heated and expands, which further pushes the docking ring towards the side closer to the movable ring, so as to squeeze the first sealing ring, causing the first sealing ring to deform and firmly press against the peripheral wall of the docking groove, further improving the sealing effect of the isolation cloth cover. Attached Figure Description

[0030] Figure 1 This is a cross-sectional view of the overall structure of the low-voltage room, as shown in Example 1.

[0031] Figure 2 This is a schematic diagram of the overall structure of Example 1;

[0032] Figure 3 This is a schematic diagram of the structure of the weak current cabinet shown in Example 1, where an isolation cloth cover is installed.

[0033] Figure 4 This is a partial cross-sectional view of Embodiment 1 illustrating the limiting component;

[0034] Figure 5 yes Figure 4 Enlarged view of point A in the middle;

[0035] Figure 6 This is a partial cross-sectional view of the docking ring in Example 2.

[0036] Explanation of reference numerals in the attached drawings: 1. Mounting base; 11. Smoke detector; 12. Exhaust pipe; 13. Sliding groove; 14. Mounting rod; 15. Through-hole; 16. Cylinder; 17. Connecting plate; 18. Connecting rope; 2. Docking seat; 21. Docking groove; 22. Docking ring; 221. Second sealing ring; 222. Embedding groove; 23. First compression spring; 24. First connecting groove; 25. Connecting ring groove; 26. Second magnet; 3. Movable ring; 31. First 32. Sealing ring; 33. Second connecting groove; 4. First magnet; 5. Isolation cloth cover; 41. Mounting ring; 5. Limiting assembly; 51. Limiting arc plate; 511. Guide part; 512. First guide surface; 513. Sliding block; 52. Return spring; 53. Pull rope; 6. Shaping ring; 7. Connector; 71. Snap-fit ​​post; 711. Second guide surface; 712. Actuating block; 72. Second compression spring; 8. Low voltage room; 81. Recessed groove; 9. Low voltage cabinet. Detailed Implementation

[0037] The following is in conjunction with the appendix Figure 1-6 This application will be described in further detail.

[0038] Example 1:

[0039] This application discloses a fire-fighting device for low-voltage networks, which is installed in a low-voltage room to extinguish fires in the low-voltage cabinets inside the room.

[0040] Reference Figure 1 , Figure 2 A fire protection device for a low-voltage network includes a mounting base 1 and a docking base 2. In this embodiment, both the mounting base 1 and the docking base 2 are configured as circular plate structures. The mounting base 1 is used to install on the top wall of the low-voltage room 8. A mounting rod 14 is fixedly installed on the top wall of the mounting base 1. The mounting rod 14 is vertically arranged, and the upper end face of the mounting rod 14 is detachably installed on the top wall of the low-voltage room 8 by means of bolt fixing.

[0041] Reference Figure 1 , Figure 2The docking seat 2 is used to install on the bottom wall of the low-voltage room 8. The docking seat 2 and the mounting seat 1 are coaxially arranged. It should be noted that when installing the docking seat 2, a recess 81 needs to be opened in the bottom wall of the low-voltage room 8. The docking seat 2 is used to match and install in the recess 81 so that the upper surface of the docking seat 2 is flush with the bottom wall of the low-voltage room 8. The top wall of the docking seat 2 is used for the installation of the low-voltage cabinet 9 so that the docking seat 2 is located directly below the low-voltage cabinet 9 and the mounting seat 1 is located directly above the low-voltage cabinet 9. The upper surface of the docking seat 2 has a cable passage for the power supply line to pass through (not shown in the figure). The wires in the low-voltage cabinet 9 are connected to the external equipment through the cable passage.

[0042] Reference Figure 2 , Figure 3 A movable ring 3 is slidably installed between the mounting base 1 and the docking base 2. The movable ring 3 is arranged in a ring around the axial direction of the mounting base 1. The inner diameter of the movable ring 3 is adapted to the outer diameter of the mounting base 1, and the outer diameter of the movable ring 3 is smaller than the outer diameter of the docking base 2. An isolation cloth cover 4 is installed between the movable ring 3 and the mounting base 1. The isolation cloth cover 4 is arranged in a ring around the outer peripheral wall of the mounting base 1. The lower end face of the isolation cloth cover 4 is fixedly connected to the upper end face of the movable ring 3. The upper end face of the isolation cloth cover 4 is fixedly connected to the mounting ring 41. The mounting ring 41 is detachably installed on the outer peripheral wall of the mounting base 1 by bolt fixing. In this embodiment, the isolation cloth cover 4 is set as an aluminum foil composite fiberglass cloth isolation cloth cover 4.

[0043] Reference Figure 3 , Figure 4 The lower end face of the movable ring 3 is fixedly equipped with a first magnet 33 arranged in a ring. The upper surface of the docking seat 2 is provided with a connecting ring groove 25, which is arranged in a ring around the axis of the docking seat 2. A second magnet 26 is embedded in the connecting ring groove 25. The shape of the first magnet 33 is adapted to the shape of the second magnet 26. The movable ring 3 is normally sleeved on the outer periphery of the mounting seat 1 so that the isolation cloth cover 4 is stored on the periphery of the mounting seat 1. When the movable ring 3 moves downward and abuts against the upper surface of the docking seat 2, the isolation cloth cover 4 covers the weak current cabinet 9, and the first magnet 33 is magnetically attracted to the second magnet 26. With this design, when the weak current cabinet 9 is on fire, the movable ring 3 moves downward so that the first magnet 33 is magnetically attracted to the second magnet 26. The movable ring 3 drives the isolation cloth cover 4 to move downward and cover the weak current cabinet 9 to isolate the outside air, thereby enabling the weak current cabinet 9 to achieve the effect of rapid fire extinguishing.

[0044] Reference Figure 2 , Figure 4 The bottom wall of the mounting base 1 is provided with multiple sliding grooves 13. All sliding grooves 13 are arranged at intervals around the axial direction of the mounting base 1. Both ends of each sliding groove 13 are arranged radially along the mounting base 1. Each sliding groove 13 is equipped with a limiting component 5. The limiting component 5 is used to keep the movable ring 3 located on the outer periphery of the mounting base 1, so as to force the isolation cloth cover 4 to be housed on the outer periphery of the mounting base 1.

[0045] Reference Figure 4 , Figure 5 The limiting component 5 includes a limiting arc plate 51, a return spring 52, and a pulling member. The limiting arc plate 51 is installed on the bottom wall of the mounting base 1, and a sliding block 513 is fixedly installed on the top wall of the limiting arc plate 51. The sliding block 513 is slidably installed in the corresponding sliding groove 13. The limiting arc plate 51 is slidably installed on the bottom wall of the mounting base 1 through the sliding block 513. The return spring 52 is installed in the sliding groove 13. One end of the return spring 52 is fixedly connected to the sliding block 513, and the other end is fixedly connected to the inner wall of the sliding groove 13. The return spring 52 normally causes the limiting arc plate 51 to move away from the center of the mounting base 1, and forms a guide part 511 protruding from the outer periphery of the mounting base 1. The guide part 511 is supported on the lower end face of the movable ring 3, and the movable ring 3 is limited to the outer periphery of the mounting base 1 through the guide part 511.

[0046] Reference Figure 4 , Figure 5 In this embodiment, the outer peripheral wall of the mounting rod 14 is provided with a through channel 15, which extends into the mounting base 1 and communicates with all the sliding grooves 13; a cylinder 16 is installed on the top wall of the mounting base 1, the cylinder body of the cylinder 16 is fixedly installed on the top wall of the mounting base 1, a connecting plate 17 is fixedly installed on the piston rod of the cylinder 16, a connecting rope 18 is installed on the surface of the connecting plate 17, one end of the connecting rope 18 is fixedly connected to the surface of the connecting plate 17, and the other end of the connecting rope 18 extends into the through channel 15; In this embodiment, the pulling component includes a pull rope 53. One end of the pull rope 53 is fixedly connected to the sliding block 513, and the other end extends into the through-channel 15 and is fixedly connected to the connecting rope 18. With this design, the piston rod of the cylinder 16 is driven to extend, which can pull the connecting rope 18. The connecting rope 18 pulls the pull ropes 53 in all the limiting components 5, thereby pulling the guide portion 511 of the limiting arc plate 51 under the mounting base 1 to avoid the movable ring 3. The movable ring 3 falls to the docking base 2 under its own gravity.

[0047] Reference Figure 3 , Figure 4 A smoke detector 11 is fixedly installed on the bottom wall of the mounting base 1. The smoke detector 11 is equipped with a controller (not shown in the figure). The controller is electrically connected to the cylinder 16. When a fire occurs in the low-voltage cabinet 9, the smoke detector 11 is triggered and drives the piston rod of the cylinder 16 to extend through the controller, so as to pull the limiting arc plate 51, forcing the guide part 511 of the limiting arc plate 51 to disengage from the lower end face of the movable plate, thereby allowing the movable ring 3 to move down and dock with the docking seat 2 and drive the isolation cloth cover 4 to cover the low-voltage cabinet 9.

[0048] Reference Figure 3 , Figure 4In this embodiment, an exhaust pipe 12 is installed on the top wall of the mounting base 1. The inlet end of the exhaust pipe 12 penetrates the bottom wall of the mounting base 1 and connects to the inside of the isolation cloth cover 4. The outlet end of the exhaust pipe 12 is used to connect to an exhaust device (not shown in the figure). The exhaust device can be a vacuum pump. When the isolation cloth cover 4 is placed on the weak current cabinet 9, the air inside the isolation cloth cover 4 is extracted outward by the exhaust device to reduce the oxygen content inside the isolation cloth cover 4 and further improve the fire extinguishing efficiency.

[0049] Reference Figure 3 , Figure 5 In this embodiment, a plurality of shaping rings 6 for maintaining the shape of the isolation cloth cover 4 are fixedly installed on the outer periphery of the isolation cloth cover 4. The shaping rings 6 are iron rings and are arranged in a ring around the axial direction of the mounting base 1. The plurality of shaping rings 6 are arranged at intervals along the length direction of the isolation cloth cover 4. Each shaping ring 6 is installed on the outer periphery of the isolation cloth cover 4 by adhesive bonding. In this embodiment, the inner diameter of the shaping ring 6 is larger than the outer diameter of the movable base.

[0050] Reference Figure 3 , Figure 4 It should be noted that when the movable ring 3 moves down to dock with the docking seat 2, the piston rod of the cylinder 16 needs to return to the contracted state to force the guide part 511 of the limiting arc plate 51 to protrude from the outer peripheral wall of the mounting seat 1. With this design, the guide part 511 protruding from the outer peripheral wall of the mounting seat 1 can open the isolation cloth cover 4 outward, so that when the isolation cloth cover 4 is extinguished, the movable ring 3 or the shaping ring 6 is lifted upward, the guide part 511 can guide the isolation cloth cover 4 to fold outward, so that it is folded outward and stored on the outer peripheral side of the mounting seat 1.

[0051] Reference Figure 3 , Figure 5 The guide part 511 has a first guide surface 512 on the side wall near the docking part. When the movable ring 3 or the shaping ring 6 is slidably fitted onto the mounting base 1, the movable ring 3 or the shaping ring 6 abuts against the first guide surface 512 and pushes the limiting arc plate 51 to move toward the center of the mounting base 1. It should be noted that when the isolation cloth cover 4 is stored, the shaping ring 6 is pulled from top to bottom in sequence so that all the shaping rings 6 are fitted onto the periphery of the mounting base 1 in sequence. Finally, the movable ring 3 is pulled so that the movable ring 3 is fitted onto the periphery of the mounting base 1, thus completing the storage of the isolation cloth cover 4.

[0052] The implementation principle of Embodiment 1 of this application is as follows: The isolation cloth cover 4 is normally stored on the outer periphery of the mounting base 1 under the limiting arc plate 51. When a fire occurs in the low-voltage cabinet 9, the smoke alarm 11 is triggered. At this time, the piston rod of the cylinder 16 extends outward to pull the limiting arc plate 51 and force the limiting arc plate 51 to disengage from the supporting effect on the movable ring 3. The movable ring 3 falls into the docking seat 2 under its own gravity, thereby covering the low-voltage cabinet 9 to isolate it from the outside air. At the same time, the air inside the isolation cloth cover 4 is extracted outward through the air extraction pipe 12, which greatly improves the fire extinguishing efficiency of the low-voltage cabinet 9.

[0053] After the fire in the low-voltage cabinet 9 is extinguished, the operator uses tools such as a ladder to pull the uppermost plastic ring 6 upwards. The plastic ring 6 forces the limiting arc plate 51 to move closer to the center of the mounting base 1 through the first guide surface 512, so that the plastic ring 6 can be fitted onto the outer periphery of the mounting base 1. All plastic rings 6 are fitted onto the outer periphery of the mounting base 1 from top to bottom, and finally the movable ring 3 is fitted, so that the isolation cloth cover 4 is stored on the outer periphery of the mounting base 1.

[0054] The protruding guide portion 511 can expand the isolation cloth cover 4 outward, so that during the storage process, the part of the isolation cloth cover 4 between the shaping ring 6 and the mounting ring 41, the part of the isolation cloth cover 4 between two adjacent shaping rings 6, and the part of the isolation cloth cover 4 between the shaping ring 6 and the movable ring 3 can all be folded outward under the guidance of the guide portion 511, which greatly improves the neatness of the folded isolation cloth cover 4 after storage, so as to facilitate the next use.

[0055] Example 2:

[0056] This application discloses a fire-fighting device for low-voltage networks.

[0057] Reference Figure 6 The difference between the fire protection device for low-voltage networks disclosed in this application and Embodiment 1 is that:

[0058] In this embodiment, the top wall of the docking seat 2 is provided with a docking groove 21, which is arranged in a ring around the axial direction of the docking seat 2. The docking groove 21 is arranged opposite to the movable ring 3 for the movable ring 3 to be embedded. A first sealing ring 31 is fixedly installed on the end face of the movable ring 3 near the docking seat 2. When the movable ring 3 is embedded in the docking groove 21, the first sealing ring 31 is embedded in the docking groove 21 to improve the sealing effect between the movable ring 3 and the docking seat 2.

[0059] Reference Figure 6The upper surface of the docking seat 2 is provided with a first connecting groove 24 that communicates with the docking groove 21, and the outer peripheral wall of the movable ring 3 is provided with a second connecting groove 32. When the movable ring 3 is embedded in the docking groove 21, the first connecting groove 24 and the second connecting groove 32 are arranged opposite to each other. The first connecting groove 24 is equipped with a connector 7 for keeping the movable ring 3 embedded in the docking groove 21.

[0060] Reference Figure 6 The connector 7 includes a snap-fit ​​post 71 and a second compression spring 72. The snap-fit ​​post 71 is slidably installed in the first connecting groove 24, and the side wall of the snap-fit ​​post 71 near the second connecting groove 32 has a second guide surface 711. The second compression spring 72 is installed in the first connecting groove 24, with one end fixedly connected to the inner wall of the first connecting groove 24 and the other end fixedly connected to the side wall of the snap-fit ​​post 71. The second compression spring 72 normally causes the snap-fit ​​post 71 to be inserted into the second connecting groove 32. The side wall of the snap-fit ​​post 71 is equipped with a toggle block 712 for disengaging the snap-fit ​​post 71 from the second connecting groove 32, and the toggle block 712 is partially exposed in the first connecting groove 24.

[0061] Reference Figure 6 A docking ring 22 is slidably installed in the docking groove 21. The shape of the docking ring 22 is adapted to the shape of the docking groove 21. A first compression spring 23 is installed in the docking groove 21. Multiple first compression springs 23 are arranged at intervals around the central axis of the docking groove 21. One end of the first compression spring 23 is fixedly connected to the bottom wall of the docking groove 21, and the other end is fixedly connected to the docking ring 22. The first compression spring 23 normally keeps the upper end surface of the docking ring 22 flush with the upper surface of the docking seat 2.

[0062] Reference Figure 6 In this embodiment, both the outer and inner peripheral walls of the docking ring 22 are provided with embedding grooves 222. The embedding grooves 222 are arranged in a ring around the central axis of the docking ring 22. Each embedding groove 222 is fitted with a second sealing ring 221. In this embodiment, both the first sealing ring 31 and the second sealing ring 221 are rubber rings. The second sealing ring 221 is used to abut against the peripheral wall of the docking groove 21 so that a closed space is formed in the docking groove 21. When the movable ring 3 is embedded in the docking groove 21, the docking groove 21 moves toward the side closer to the first compression spring 23 and compresses air into the docking groove 21.

[0063] The implementation principle of Embodiment 2 of this application is as follows: Under normal circumstances, the docking ring 22 remains flush with the upper surface of the docking seat 2 under the action of the first compression spring 23, thereby sealing the docking groove 21 and reducing the possibility of foreign objects falling into the docking groove 21; when a fire occurs in the weak current cabinet 9, the movable ring 3 moves down and is embedded in the docking groove 21. The movable ring 3 can push the docking ring 22 to move downward and squeeze the first compression spring 23. After the movable ring 3 is embedded in the docking groove 21, the locking post 71 is locked into the second connecting groove 32 under the action of the second compression spring 72, thereby fixing the movable ring 3 to the docking groove 21. During a fire, the air inside the docking groove 21 expands, thereby compressing the docking ring 22. Under the compression of the first compression spring 23 and the expanded air inside the docking groove 21, the docking ring 22 acts on the first sealing ring 31, forcing the first sealing ring 31 to deform and thus firmly press against the peripheral wall of the docking groove 21, greatly improving the sealing effect of the first sealing ring 31, and thus improving the fire extinguishing effect of the overall structure. After the fire is extinguished, by pulling the locking post 71 with the actuating block 712 and forcing the locking post 71 to disengage from the second connecting groove 32, the movable ring 3 can be removed and stored in the mounting base 1.

[0064] The above are preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made to the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A fire extinguishing apparatus for a low voltage network, characterized by: The utility model provides an installation seat (1) for installing on the top of weak current cabinet (9) and a butt joint seat (2) for installing on the bottom of weak current cabinet (9), a movable ring (3) is slidably installed between the installation seat (1) and the butt joint seat (2), an isolation cloth cover (4) is arranged between the installation seat (1) and the movable ring (3), when the movable ring (3) is butted in the butt joint seat (2), the isolation cloth cover (4) covers weak current cabinet (9), the movable ring (3) is normally sleeved on the circumferential side of the installation seat (1) to make the isolation cloth cover (4) be stored in the circumferential side of the installation seat (1), the installation seat (1) is equipped with a limiting assembly (5) for keeping the movable ring (3) on the circumferential side of the installation seat (1), the bottom wall of the installation seat (1) is equipped with a smoke alarm (11), when the smoke alarm (11) triggers, the limiting assembly (5) is separated from the movable ring (3) to make the movable ring (3) descend and butt in the butt joint seat (2), the bottom wall of the installation seat (1) is provided with a sliding groove (13), the both ends of the sliding groove (13) extend along the radial direction of the installation seat (1), the limiting assembly (5) includes a limiting arc plate (51), a reset spring (52) and a pulling member, the limiting arc plate (51) is arranged on the bottom wall of the installation seat (1) and is slidably installed in the sliding groove (13), the reset spring (52) is installed between the sliding groove (13) and the limiting arc plate (51), the reset spring (52) normally makes the limiting arc plate (51) move away from the center of the installation seat (1) and is supported on the lower end surface of the movable ring (3), the reset spring (52) normally makes the limiting arc plate (51) move away from the center of the installation seat (1) and forms a guide part (511) protruding from the outer circumferential side of the installation seat (1), when the isolation cloth cover (4) is stored, the guide part (511) makes the isolation cloth cover (4) fold outward to be stored in the outer circumferential side of the installation seat (1), the guide part (511) has a first guide surface (512), when the movable ring (3) is slidably sleeved on the installation seat (1), the movable ring (3) abuts on the first guide surface (512) and pushes the limiting arc plate (51) to move close to the center of the installation seat (1).

2. The fire extinguishing apparatus for a weak electric network according to claim 1, characterized by: The top wall of the installation seat (1) is provided with an air extraction pipe (12), the inlet end of the air extraction pipe (12) penetrates the bottom wall of the installation seat (1), and the outlet end of the air extraction pipe (12) is used for connecting an air extraction device.

3. The fire extinguishing apparatus for a weak electric network according to claim 2, characterized in that: The outer circumferential side of the isolation cloth cover (4) is provided with a plurality of shaping rings (6) for keeping the shape of the isolation cloth cover (4), a plurality of the shaping rings (6) are arranged at intervals along the length direction of the isolation cloth cover (4), and the inner diameter of the shaping ring (6) is greater than the outer diameter of the installation seat (1).

4. The fire extinguishing apparatus for a weak electric network according to claim 1, characterized by: The top wall of the docking seat (2) is provided with a docking groove (21) for embedding the movable ring (3), and the movable ring (3) is provided with a first sealing ring (31) embedded in the docking groove (21) near the end face of the docking seat (2), and the docking groove (21) is provided with a connecting piece (7) for keeping the movable ring (3) embedded in the docking groove (21).

5. The fire extinguishing apparatus for a weak electric network according to claim 4, characterized in that: The docking groove (21) is slidably installed with a docking ring (22), and the docking ring (22) and the docking groove (21) are provided with a first compression spring (23), which keeps the upper end face of the docking ring (22) flush with the upper surface of the docking seat (2) in normal state.

6. The fire extinguishing apparatus for a weak electric network according to claim 5, characterized by: The shape of the docking ring (22) is matched with the shape of the docking groove (21), and the peripheral wall of the docking ring (22) is provided with a second sealing ring (221) for abutting against the peripheral wall of the docking groove (21), when the movable ring (3) is embedded in the docking groove (21), the docking groove (21) moves towards the side close to the first compression spring (23) and makes the docking groove (21) have compressed air.

7. The fire extinguishing apparatus for a weak electric network according to claim 4, characterized by: The upper surface of the docking seat (2) is provided with a first connecting groove (24) communicated with the docking groove (21), and the outer peripheral wall of the movable ring (3) is provided with a second connecting groove (32), when the movable ring (3) is embedded in the docking groove (21), the first connecting groove (24) and the second connecting groove (32) are oppositely arranged; the connecting piece (7) comprises a clamping column (71) and a second compression spring (72), the clamping column (71) is slidably installed in the first connecting groove (24), and the second compression spring (72) is installed between the first connecting groove (24) and the clamping column (71), and the second compression spring (72) keeps the clamping column (71) inserted into the second connecting groove (32) in normal state.

8. The fire extinguishing apparatus for a low-voltage network according to claim 1, characterized by: The isolation cloth cover (4) is an aluminum foil composite glass fiber cloth isolation cloth cover (4).

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