A fireproof cable

Abstract

The present application relates to the technical field of cable, particularly relates to a fireproof cable, which comprises a cable body one and a cable body two, and further comprises a connecting unit, the connecting unit is used for connecting the cable body one and the cable body two, the connecting unit comprises two threaded connecting parts connected with the end of the cable body one and the end of the cable body two respectively, and a connecting sleeve is connected between the two threaded connecting parts, and a separation part is arranged in the connecting sleeve. The threaded connecting part and the connecting sleeve are matched with the separation part, the multiple separation plates are limited as a whole, the multiple separation plates completely separate the multiple butt-jointed battery cores, the direct contact between the battery cores is avoided from the physical layer, meanwhile, the battery core clamping pieces limit the butt-jointed battery cores, the contact between the battery cores and the inner wall of the connecting sleeve is prevented, the insulation barrier failure is fundamentally avoided, and the occurrence of electrical short circuit, electric leakage and other faults is avoided.

Description

Technical Field

[0001] This invention relates to the field of cable technology, and in particular to a fire-resistant cable. Background Technology

[0002] Fire-resistant cables come in various types. Among them, rigid mineral-insulated fire-resistant cables use copper conductors as the core, magnesium oxide as the insulation layer, and seamless copper sheath as the outer sheath. They have excellent fire resistance, explosion resistance, high temperature resistance, corrosion resistance, and high current carrying capacity. They are widely used in high-rise buildings, subways, nuclear power plants, petrochemical plants, military facilities, and other places with extremely high requirements for fire safety and power supply reliability. They are key infrastructure for ensuring power supply and personnel evacuation in emergency situations.

[0003] In the existing intermediate connection structure of rigid mineral-insulated fireproof cables, after multiple electrical cores are connected, they are usually placed directly inside the copper connecting sleeve. Even if the sleeve is filled with magnesium oxide insulating powder, there are still significant defects: Firstly, under the influence of pulling and vibration during cable laying and thermal expansion and contraction and environmental vibration during long-term operation, the electrical cores are prone to displacement, which can lead to contact between adjacent electrical cores, causing phase-to-phase insulation breakdown and triggering phase-to-phase short circuits. Secondly, contact between the electrical cores and the inner wall of the copper connecting sleeve can cause short circuits to ground, resulting in all equipment casings in the circuit becoming energized, directly causing the insulation barrier to fail. Moreover, after the heat-shrinkable sleeve at the connection point contacts the inner wall of the connecting sleeve, it does not meet the fireproof requirements, increasing safety hazards.

[0004] On the other hand, during long-term operation, the magnesium oxide insulating powder that fills the connecting sleeve will naturally settle under gravity, forming a large through gap in the upper part of the sleeve. This will lead to a significant reduction in the insulation resistance of the connection part and a sharp decline in fire resistance, failing to meet long-term fire protection requirements and posing a major risk of electrical fire and power outage.

[0005] Therefore, there is an urgent need to provide a fire-resistant cable with low magnesium oxide powder settling and stable cell position. Summary of the Invention

[0006] Therefore, it is necessary to provide a fire-resistant cable to solve the technical problems mentioned in the background section.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: a fireproof cable, comprising a cable body one and a cable body two.

[0008] The fireproof cable also includes a connecting unit for connecting cable body one and cable body two. The connecting unit includes two threaded connecting parts connected to the ends of cable body one and cable body two respectively. A connecting sleeve is connected between the two threaded connecting parts, and a partition is provided inside the connecting sleeve.

[0009] The partition includes a partition rod disposed inside the connecting sleeve. Multiple circumferentially evenly distributed partition plates are installed on the outer circumferential surface of the partition rod. The multiple partition plates divide the interior of the connecting sleeve into multiple independent filling areas, and the filling areas are filled with minerals.

[0010] The partition also includes multiple cell clamping groups evenly distributed along the length of the partition rod. Each cell clamping group consists of multiple cell clamping components evenly distributed circumferentially around the outer periphery of the partition rod. The position of the cell is defined by the combined action of the cell clamping components and the minerals filling the filling area.

[0011] Multiple partitions separate the multiple connected cable cores and cable body cores, and then the filling area is filled with minerals to make the structure of the connection consistent with the structure of the cable; at the same time, the multiple partitions block the filling minerals, so that the gaps after the minerals settle over a long period of time meet the fire protection requirements.

[0012] Preferably, the threaded connection includes a threaded connector sleeved on the cable body, an end cap for sealing one end of the cable body is provided inside the threaded connector, and a locking nut sleeve sleeved on the cable body is provided on the outer periphery of the threaded connector, and the locking nut sleeve is threadedly connected to the threaded connector.

[0013] Preferably, the battery cell clamping component includes two limiting frames respectively installed on the opposite surfaces of two adjacent partition plates, with a reinforcing arc plate slidably connected within the two limiting frames, and two limiting plates symmetrically installed on the outer surface of the partition rod.

[0014] Preferably, the battery cell clamping component further includes a sliding rod that is slidably connected to the reinforcing arc plate. A U-shaped positioning plate is installed at one end of the sliding rod near the separator rod, and a connecting spring sleeved on the outer periphery of the sliding rod is installed between the positioning plate and the reinforcing arc plate.

[0015] Preferably, both ends of the partition plate are provided with snap-fit ​​openings, which engage with corresponding threaded joints.

[0016] Preferably, the inner wall of the connecting sleeve is provided with connecting openings at both ends, and the connecting openings are provided with threaded teeth. The threaded teeth are threadedly connected to the corresponding threaded joints, and a filling space is formed between the connecting openings and the threaded joints.

[0017] Preferably, the connecting sleeve has two symmetrical injection holes, which are connected to the corresponding filling space, and the injection holes are threaded with a sealing screw.

[0018] Preferably, the inner wall of the connecting sleeve is provided with multiple sliding openings, and the sliding openings are slidably connected to the end of the corresponding partition plate away from the partition rod.

[0019] In summary, the present invention has the following beneficial technical effects: 1. The threaded connection part and the connecting sleeve used in the present invention cooperate with the partition part to limit the overall positioning of multiple partition plates. The multiple partition plates completely separate the multiple connected battery cells, eliminating the possibility of direct contact between battery cells from a physical perspective; at the same time, the battery cell clamping part limits the connected battery cells, preventing the battery cells from contacting the inner wall of the connecting sleeve, fundamentally avoiding the failure of the insulation barrier, and eliminating the occurrence of electrical short circuits, leakage and other faults.

[0020] 2. The connection unit of this invention is filled with high-purity magnesium oxide powder that is exactly the same as that of the cable body, so that the insulation and fireproof structure of the cable connection is consistent with the main structure of the cable. This ensures that the connection has the same fireproof rating and fireproof performance as the cable body. In addition, the partition plate divides the inside of the connection sleeve into multiple independent filling areas, so that the minerals settle only in their respective areas. This avoids the problem of excessive gaps formed by the accumulation of minerals after long-term use in the traditional integral filling method. It ensures that the gaps after mineral settlement can still meet the fireproof requirements, and greatly extends the fireproof life of the connection. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0022] Figure 1 A three-dimensional structural schematic diagram of the present invention is shown;

[0023] Figure 2 A schematic diagram of the structure of the present invention for removing the connecting sleeve is shown;

[0024] Figure 3 A front view of the invention is shown;

[0025] Figure 4 It shows Figure 3 Sectional view of AA;

[0026] Figure 5 A schematic diagram of the structure of the partition of the present invention is shown;

[0027] Figure 6 A full sectional view of the present invention is shown.

[0028] The above-mentioned figures include the following reference numerals: 1. Cable body one; 2. Cable body two; 3. Connecting unit; 30. Threaded connection part; 300. Threaded joint; 301. End cap; 302. Locking screw sleeve; 31. Connecting sleeve; 310. Injection hole; 311. Sealing screw; 312. Sliding opening; 32. Separator; 320. Separator rod; 321. Separator plate; 322. Limiting frame; 323. Reinforcing arc plate; 324. Limiting plate; 325. Sliding rod; 326. Positioning plate; 327. Connecting spring; 4. Filling area; 5. Injection space. Detailed Implementation

[0029] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways not described herein, and those skilled in the art can make similar modifications without departing from the spirit of the invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0030] See Figure 1 , Figure 2 and Figure 3 A fire-resistant cable includes a cable body 1 and a cable body 2. Both cable body 1 and cable body 2 are rigid mineral-insulated fire-resistant cables, consisting of a copper conductor core, a magnesium oxide fire-resistant insulating layer, and a seamless copper sheath.

[0031] See Figure 1 , Figure 2 , Figure 4 and Figure 5 The fireproof cable also includes a connecting unit 3 for connecting cable body 1 and cable body 2. The connecting unit 3 includes two threaded connecting parts 30 respectively connected to the end of cable body 1 and the end of cable body 2. The threaded connecting part 30 includes a threaded connector 300 sleeved on cable body 1. The threaded connector 300 is provided with an end cap 301 for sealing the end of cable body 1. The threaded connector 300 is provided with a locking sleeving 302 sleeved on cable body 1 on its outer periphery. The locking sleeving 302 is threadedly connected to the threaded connector 300.

[0032] In practice, before connecting cable body 1 and cable body 2, two locking sleeves 302, two threaded connectors 300, and two end caps 301 are sequentially fitted onto the ends of the connecting sections of cable body 1 and cable body 2. The two end caps 301 seal the ends of cable body 1 and cable body 2 respectively to prevent magnesium oxide powder from scattering. After the end caps 301 seal the ends of cable body 1 and cable body 2, only the multiple battery cores used for docking are exposed. The end caps 301 are existing technology components and are used in the same way as existing technology.

[0033] See Figure 1 and Figure 5 A connecting sleeve 31 is connected between the two threaded connection parts 30. The connecting sleeve 31 is made of copper. Both ends of the inner wall of the connecting sleeve 31 are provided with connection openings. Threaded teeth are provided in the connection openings and are threadedly connected to the corresponding threaded connectors 300.

[0034] In practice, after the end-sealing sleeve 301 seals the cable body 1 and cable body 2, the connecting sleeve 31 is fitted onto either cable body 1 or cable body 2.

[0035] See Figure 1 , Figure 4 , Figure 5 and Figure 6 The connecting sleeve 31 is provided with a partition 32. The partition 32 includes a partition rod 320 disposed in the connecting sleeve 31. Multiple partition plates 321 are evenly distributed in the circumference on the outer ring surface of the partition rod 320. The partition rod 320 and the partition plates 321 are made of high-purity alumina ceramic, silicon nitride ceramic, mica reinforced ceramic and other materials that are resistant to high temperature, have insulation, high strength and low expansion coefficient.

[0036] In practice, after the connecting sleeve 31 is installed, the separator rod 320 and multiple separator plates 321 are moved between cable body 1 and cable body 2. Then, the electrical cores of cable body 1 and cable body 2 approach each other, and the electrical cores that are coaxially connected on both sides are simultaneously located between two adjacent separator plates 321. Then, multiple coaxial corresponding electrical cores are connected sequentially through multiple existing terminals to realize the circuit connection between cable body 1 and cable body 2. Multiple separator plates 321 separate the multiple connected electrical cores of cable body 1 and cable body 2 from each other.

[0037] See Figure 1 , Figure 4 , Figure 5 and Figure 6The partition 32 further includes multiple cell clamping assemblies evenly distributed along the length of the partition rod 320. Each cell clamping assembly consists of multiple cell clamping members evenly distributed circumferentially around the outer periphery of the partition rod 320. Each cell clamping member includes two limiting frames 322 respectively installed on the opposite surfaces of two adjacent partition plates 321. A reinforcing arc plate 323 is slidably connected within the two limiting frames 322. Two limiting plates 324 are symmetrically installed on the outer surface of the partition rod 320.

[0038] See Figure 1 , Figure 4 , Figure 5 and Figure 6 The battery cell clamping component also includes a sliding rod 325 that is slidably connected to the reinforcing arc plate 323. A U-shaped positioning plate 326 is installed at one end of the sliding rod 325 near the separating rod 320. A connecting spring 327 sleeved on the outer periphery of the sliding rod 325 is installed between the positioning plate 326 and the reinforcing arc plate 323. The reinforcing arc plate 323, the sliding rod 325, the positioning plate 326 and the limiting frame 322 are all made of high-purity alumina ceramic, silicon nitride ceramic, mica reinforced ceramic and other materials that are resistant to high temperature, insulating, high-strength and low expansion coefficient.

[0039] In actual operation, multiple separator plates 321 separate multiple connected battery cells, with the multiple battery cells positioned between two corresponding limiting plates 324. Subsequently, multiple reinforcing arc plates 323 are inserted into the two corresponding limiting frames 322. The reinforcing arc plates 323 drive the sliding rod 325 and the positioning plate 326 to move to the two corresponding limiting plates 324. The connecting spring 327 presses the positioning plate 326 onto the battery cell. The positioning plate 326 cooperates with the limiting plate 324 to limit the battery cell, effectively preventing direct contact between the battery cells or between the battery cell and the inner wall of the connecting sleeve 31, thereby preventing the insulation barrier from failing directly and eliminating electrical faults. At the same time, the connecting spring 327 pushes the reinforcing arc plates 323 so that their ends are tightly attached to the limiting frames 322, preventing the reinforcing arc plates 323 from sliding relative to the limiting frames 322 under slight force. The reinforcing arc plates 323 also support and reinforce the two adjacent separator plates 321, preventing damage to the separator plates 321.

[0040] See Figure 2 , Figure 5 and Figure 6 Both ends of the partition plate 321 are provided with snap-fit ​​openings, which are engaged with the corresponding threaded joints 300.

[0041] See Figure 4 The inner wall of the connecting sleeve 31 is provided with a plurality of sliding openings 312, and the sliding openings 312 are slidably connected to the end of the corresponding partition plate 321 away from the partition rod 320.

[0042] In practice, after multiple connected battery cells are positioned, the connecting sleeve 31 is moved towards the partition plate 321. Multiple sliding openings 312 on the inner wall of the connecting sleeve 31 are slidably connected to the corresponding partition plates 321. The partition plates 321 divide the interior of the connecting sleeve 31 into multiple independent filling areas 4. Then, a threaded connector 300 is threaded onto the end of the connecting sleeve 31 to seal one end. Next, the multiple filling areas 4 are filled with minerals, specifically high-purity magnesium oxide powder. Then, another threaded connector 300 is threaded onto the other end of the connecting sleeve 31 to seal the other end and prevent the minerals from scattering from the connecting sleeve 31. Finally, two locking sleeves 302 are... The threaded connector 300 is threaded; when the threaded connector 300 is connected to the connecting sleeve 31, the end of the threaded connector 300 engages with the corresponding snap-fit ​​opening on the partition plate 321, thereby centering and limiting the partition plate 321. Then, through the engagement of the sliding opening 312 with the partition plate 321, the partition plate 321 is axially limited, effectively preventing the partition plate 321 from rotating, thereby preventing the movement of the battery core; by filling multiple filling areas 4 with minerals, the structure at the connection between the battery core of cable body 1 and the battery core of cable body 2 is consistent with the structure of the cable body, so as to meet the fire protection requirements; the battery core clamping parts and the minerals filled in the filling areas 4 work together to further limit the position of the battery core, while also playing a fireproof role.

[0043] Multiple partitions 321 can also separate the filled minerals, so that the minerals only settle within their respective filling areas 4, avoiding the phenomenon of large gaps due to the accumulation of minerals after long-term use, and ensuring that the gaps after long-term mineral settling still meet fire protection requirements.

[0044] See Figure 1 and Figure 5 A glue-filling space 5 is formed between the connection opening and the threaded joint 300. Two glue injection holes 310 are symmetrically opened on the connection sleeve 31. The glue injection holes 310 are connected to the corresponding glue-filling spaces 5. A sealing screw 311 is threaded into the glue injection hole 310.

[0045] In practice, after the two threaded joints 300 are connected to the connecting sleeve 31, the two sealing screws 311 are separated from the corresponding injection holes 310 in sequence. Then, mineral insulating special sealing paste is filled into the filling space 5 through the injection hole 310. Subsequently, the sealing screws 311 are threadedly connected to the corresponding injection holes 310. The mineral insulating special sealing paste seals the gap between the connecting sleeve 31 and the threaded joint 300, effectively preventing the mineral from becoming damp and ensuring that the mineral maintains its insulating, fireproof and other physical properties for a long time.

[0046] In the description of the embodiments of the present invention, it should be noted that the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "top," and "bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the embodiments of the present invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In addition, in the description of the present invention, unless otherwise stated, "a plurality of" means two or more.

[0047] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," and "connect" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0048] The embodiments described herein are preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A fire-resistant cable, comprising a cable body one and a cable body two, characterized in that, Also includes: A connecting unit is used to connect cable body one and cable body two. The connecting unit includes two threaded connecting parts respectively connected to the end of cable body one and the end of cable body two. A connecting sleeve is connected between the two threaded connecting parts. A partition is provided inside the connecting sleeve. The partition includes a partition rod disposed inside the connecting sleeve. Multiple partition plates are evenly distributed circumferentially on the outer ring surface of the partition rod. The multiple partition plates divide the interior of the connecting sleeve into multiple independent filling areas, and the filling areas are filled with minerals. The partition also includes multiple cell clamping groups evenly distributed along the length of the partition rod. Each cell clamping group consists of multiple cell clamping components evenly distributed circumferentially around the outer periphery of the partition rod. The position of the cell is defined by the combined action of the cell clamping components and the minerals filled in the filling area. Multiple separators separate the multiple connected cable cores and cable body cores, and then the filling area is filled with minerals to make the structure of the connection consistent with the structure of the cable.

2. The fire-resistant cable according to claim 1, characterized in that: The threaded connection includes a threaded connector sleeved on the cable body, an end cap for sealing one end of the cable body is provided inside the threaded connector, and a locking nut sleeve sleeved on the outer periphery of the threaded connector is provided on the cable body, and the locking nut sleeve is threadedly connected to the threaded connector.

3. A fire-resistant cable according to claim 1, characterized in that: The cell clamping component includes two limiting frames respectively installed on the opposite surfaces of two adjacent partition plates. A reinforcing arc plate is slidably connected within the two limiting frames, and two limiting plates are symmetrically installed on the outer surface of the partition rod.

4. A fire-resistant cable according to claim 3, characterized in that: The cell clamping component also includes a sliding rod that is slidably connected to the reinforcing arc plate. A U-shaped positioning plate is installed at one end of the sliding rod near the separator rod. A connecting spring sleeved on the outer periphery of the sliding rod is installed between the positioning plate and the reinforcing arc plate.

5. A fire-resistant cable according to claim 2, characterized in that: Both ends of the partition plate are provided with snap-fit ​​openings, which are engaged with the corresponding threaded joints.

6. A fire-resistant cable according to claim 2, characterized in that: Both ends of the inner wall of the connecting sleeve are provided with connecting openings, and threaded teeth are provided in the connecting openings. The threaded teeth are threadedly connected to the corresponding threaded joints, and a filling space is formed between the connecting openings and the threaded joints.

7. A fire-resistant cable according to claim 6, characterized in that: The connecting sleeve has two symmetrical injection holes, which are connected to the corresponding filling space. A sealing screw is threaded into the injection hole.

8. A fire-resistant cable according to claim 1, characterized in that: The inner wall of the connecting sleeve is provided with multiple sliding openings, and the sliding openings are slidably connected to the end of the corresponding partition plate away from the partition rod.

Images