A flame-retardant and fire-resistant power cable for photovoltaic power generation

Abstract

The present invention relates to a flame-retardant and fire-resistant power cable for photovoltaic power generation in the field of cables, comprising a wire core, the outer end of the wire core is fixedly connected to a flame-retardant filling layer, the outer end of the flame-retardant filling layer is provided with a plurality of evenly distributed wire threading grooves, a reinforced wire harness is passed through the wire threading groove, the reinforced wire harness comprises a main reinforcing wire, a plurality of evenly distributed air bag tubes are fixedly connected to the main reinforcing wire, a heat-conductive film is coated between the main reinforcing wire and the air bag tube; an outer insulating layer covering the flame-retardant filling layer is coated between the plurality of reinforced wire harnesses, a corrugated protective sleeve is sleeved on the outer insulating layer, and a plurality of evenly distributed fixing bolts are connected between the corrugated protective sleeve and the reinforced wire harness; flame-retardant protection and buffering protection of the wire core are achieved by the reinforced wire harness, and when the reinforced wire harness catches fire, it can respond quickly, releasing carbon dioxide for flame retardancy, and can also assist in real-time monitoring of the internal and external temperatures of the cable, so as to facilitate online monitoring of the cable.

Description

Technical Field

[0001] The present invention relates to a power cable, in particular to a flame-retardant and fire-resistant power cable for photovoltaic power generation applied in the cable field. Background Art

[0002] The existing flame retardant and fire resistant technologies of power cables mainly focus on material selection, cable structure design and the use of flame retardants.

[0003] Common flame-retardant materials include low-smoke zero-halogen (LSZH) materials, mineral-filled polyolefins, and polyvinyl chloride (PVC). LSZH materials produce less smoke and corrosive gases during combustion, helping to reduce visibility loss and the production of toxic gases during fires. Mineral-filled polyolefins enhance the flame-retardant properties of cables by adding inorganic minerals, such as aluminum hydroxide or magnesium hydroxide, to the polymer matrix.

[0004] In order to solve the problem of flame retardant effect of cables, a certain cable in the market adopts a design with a heat-resistant and flame-retardant protective layer, which has a certain market share.

[0005] Chinese invention patent CN118039235B discloses a fire-retardant high-voltage cable, comprising a core, an insulation layer, a fireproof layer, a functional layer, and a jacket. The core's outer surface is provided with an insulation layer, the insulation layer's outer surface is provided with a fireproof layer, the fireproof layer's outer surface is provided with a functional layer, and the fireproof layer's outer surface is provided with a jacket. A starting cavity is radially defined on the side where the functional layer and the fireproof layer meet. The end of the starting cavity, away from the fireproof layer, is connected to one end of a dry powder bin, the other end of which is connected to a collection bin. A starting plate is provided at the bottom of the starting cavity, and a transmission plate is provided at the top of the starting cavity. This application aims to improve the effectiveness of preventing the cable from becoming flame-retardant in time after spontaneous combustion.

[0006] The specification of Chinese invention patent CN110580980B discloses a flame-retardant and pressure-resistant cable, comprising one or more fixed parts, each of which has an elastic fire extinguishing assembly fixedly disposed between adjacent fixed parts. The elastic fire extinguishing assembly is provided with one or more outer protective sheets on the outside, which are evenly spaced around the fixed parts and spliced ​​together to form a circular outer layer. The cable of the invention adopts a different installation structure, which makes the cable have a very strong pressure buffering force and better fire extinguishing performance, greatly extending the service life of the cable.

[0007] Existing cables are flame-retardant only through a protective layer made of fire-proof material. If the protective layer breaks accidentally, the fire-proof performance of the cable will be greatly reduced. In addition, it is inconvenient to monitor the temperature of the cable during use, making it difficult to detect fires near the cable in time. Summary of the Invention

[0008] In response to the above-mentioned existing technology, the technical problem to be solved by the present invention is that the existing cables are flame-retardant only by a protective layer made of fire-proof material. If the protective layer is accidentally broken, the fire-proof performance of the cable will easily be greatly reduced. In addition, it is inconvenient to monitor the temperature of the cable during use, and it is inconvenient to detect a fire near the cable in time.

[0009] To solve the above problems, the present invention provides a flame-retardant and fire-resistant power cable for photovoltaic power generation, comprising a wire core, a flame-retardant filling layer fixedly connected to the outer end of the wire core, a plurality of evenly distributed threading grooves formed at the outer end of the flame-retardant filling layer, a reinforcing wire bundle passed through the threading grooves, the reinforcing wire bundle comprising a main reinforcing wire, a plurality of evenly distributed inflatable bag tubes fixedly connected to the main reinforcing wire, the inflatable bag tubes covering one end of the main reinforcing wire and closing the opening of the threading groove, the inflatable bag tubes being filled with carbon dioxide, a plurality of elastic support columns fixedly connected to the inflatable bag tubes, the elastic support columns being filled with dry powder, and a heat-conductive film being coated between the main reinforcing wire and the inflatable bag tubes;

[0010] An outer insulation layer covered with a flame-retardant filling layer is wrapped between the multiple reinforced wiring harnesses, a corrugated protective sleeve is sleeved on the outer insulation layer, and multiple evenly distributed fixing bolts are connected between the corrugated protective sleeve and the reinforced wiring harnesses;

[0011] The fixing bolt includes a hollow thermal conductive bolt inserted into the corrugated protective sleeve, an air flow channel is opened in the middle of the hollow thermal conductive bolt, the top of the hollow thermal conductive bolt is fixedly connected with an end cover, the end cover is covered with a flammable film that closes the opening of the air flow channel, and a hot melt air sealing column is inserted in the air flow channel.

[0012] In the above-mentioned flame-retardant and fire-resistant power cable for photovoltaic power generation, the fire resistance of the entire cable is improved by strengthening the wiring harness, and when an external fire occurs, carbon dioxide and dry powder are sprayed outward through the strengthened wiring harness and fixing bolts to assist in flame retardancy.

[0013] As a further improvement of the present application, thermally conductive adhesive is filled between the reinforced wiring harness, the wire duct and the outer insulation layer.

[0014] As a further improvement of the present application, each fixing bolt corresponds to the position of an air bag tube, and mounting holes matching the fixing bolts are provided on the air bag tube, the thermal conductive film and the outer insulation layer. The two ends of the fixing bolt are respectively sealed and connected to the corrugated protective sleeve and the air bag tube.

[0015] As a further improvement of the present application, the hot melt air sealing column is made of hot melt material, the hot melt air sealing column slides relative to the air flow channel, and the manufacturing materials of the flammable film include: polylactic acid film and flammable paper film.

[0016] As another improvement of the present application, a thermal plug is installed in the middle of the flammable film, a thermal bundle is connected between the thermal plug and the main reinforcement line, the thermal bundle is fixedly connected to the hot melt air sealing column, and multiple pairs of temperature sensors matching the fixed plugs are installed in the main reinforcement line. The detection end of one temperature sensor is connected to the hot melt air sealing column, and the detection end of the other temperature sensor is installed with a thermal column close to the wire core.

[0017] As another improved supplement to the present application, an auxiliary monitoring system is also included, the auxiliary monitoring system includes a processor outside the device, and the processor is connected to a monitoring module, a data processing module and an alarm module;

[0018] The monitoring module is used to collect monitoring data from the temperature sensors in each reinforced wiring harness;

[0019] The data processing module is used to process the monitoring data and determine whether the outer side of the cable is on fire or the core is overheated based on the data processing results;

[0020] The alarm module sends out a corresponding alarm signal according to the judgment result of the data processing module, and the alarm module is connected to an alarm device.

[0021] As another improved supplement to the present application, the thermal bundle includes an elastic thermal conductive section and a hot-melt connecting section. The hot-melt connecting section is located in the hollow thermal conductive plug. When the flammable film is intact, the hot-melt air sealing column is attached to the flammable film, and the elastic thermal conductive section is in a stretched state.

[0022] As another improved supplement to the present application, two data lines are passed through the main reinforcement line, and each pair of temperature sensors is connected in parallel with the two data lines. The two ends of the data lines extend into the two inflatable bag tubes respectively, and extend through the air flow channel to the outside of the fixing plug. A wiring ring matching the data line is clamped on the corrugated protective cover, and the data line is electrically connected to the monitoring module through the wiring ring.

[0023] In summary, this solution provides flame retardant and buffering protection for the wire core by strengthening the wiring harness. When the strengthened wiring harness catches fire, it can respond quickly and release carbon dioxide for flame retardant. It can also assist in real-time monitoring of the temperature inside and outside the cable, so as to carry out online cable monitoring work. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a three-dimensional diagram of the cable according to the first embodiment of the present application;

[0025] Figure 2 This is an exploded view of the cable according to the first embodiment of the present application;

[0026] Figure 3 This is a partial cross-sectional view of the cable according to the first embodiment of the present application;

[0027] Figure 4This is a cross-sectional view of a cable according to the second embodiment of the present application;

[0028] Figure 5 for Figure 4 Schematic diagram of the structure at A in the middle;

[0029] Figure 6 This is a schematic diagram of external cable wiring according to the second embodiment of the present application;

[0030] Figure 7 This is a block diagram of the auxiliary monitoring system of the second embodiment of this application.

[0031] Description of the numbers in the figure:

[0032] 1. Wire core; 2. Flame-retardant filling layer; 3. Reinforced wire harness; 31. Main reinforcement wire; 32. Inflatable bag tube; 33. Thermal conductive film; 34. Thermal conductive bundle wire; 4. Outer insulation layer; 5. Corrugated protective sleeve; 6. Fixing bolt; 61. Hollow thermal conductive bolt; 62. End cap; 63. Flammable film; 64. Hot melt air sealing column. DETAILED DESCRIPTION

[0033] The following describes two implementation methods of the present application in detail with reference to the accompanying drawings.

[0034] The first implementation method:

[0035] Figure 1-3 A flame-retardant and fire-resistant power cable for photovoltaic power generation is shown, comprising a core 1, the outer end of which is fixedly connected to a flame-retardant filling layer 2. The flame-retardant filling layer 2 is filled by a person skilled in the art with a filling material having a flame-retardant effect in the prior art, such as a fire-resistant sponge doped with a flame retardant;

[0036] The outer end of the flame-retardant filling layer 2 is provided with a plurality of evenly distributed threading grooves, and a reinforcing wire harness 3 is passed through the threading grooves. The reinforcing wire harness 3 includes a main reinforcing wire 31, and a plurality of evenly distributed inflatable bag tubes 32 are fixedly connected to the main reinforcing wire 31. The cross section of the inflatable bag tube 32 covers one end of the main reinforcing wire 31 and closes the opening of the threading groove cross section. The inflatable bag tube 32 is filled with carbon dioxide, and a heat-conducting film 33 is coated between the main reinforcing wire 31 and the inflatable bag tube 32; a plurality of elastic support columns are fixedly connected to the inflatable bag tube 32, and the elastic support columns are filled with dry powder; the dry powder is released when the inflatable bag tube 32 ruptures; the heat-conducting film 33 plays a role in heat conduction and heat dissipation, and assists the wire core 1 in heat dissipation through the heat-conducting film 33;

[0037] An outer insulating layer 4 covering the flame-retardant filling layer 2 is wrapped between the multiple reinforced wire bundles 3 , and thermal conductive glue is filled between the reinforced wire bundles 3 and the wire ducts and the outer insulating layer 4 .

[0038] A corrugated protective sleeve 5 is sleeved on the outer insulating layer 4, and a plurality of evenly distributed fixing bolts 6 are connected between the corrugated protective sleeve 5 and the reinforced wiring harness 3;

[0039] The fixing bolt 6 includes a hollow heat-conducting bolt 61 inserted into the corrugated protective sleeve 5. The hollow heat-conducting bolt 61 is made of a heat-resistant metal material. An air flow channel is opened in the middle of the hollow heat-conducting bolt 61. The top of the hollow heat-conducting bolt 61 is fixedly connected with an end cover 62. The end cover 62 is covered with a flammable film 63 that closes the opening of the air flow channel. A hot-melt air sealing column 64 is inserted into the air flow channel. The hot-melt air sealing column 64 is a hollow structure.

[0040] Each fixing bolt 6 corresponds to the position of an inflatable bag tube 32. The inflatable bag tube 32, the thermal conductive film 33 and the outer insulating layer 4 are all provided with mounting holes matching the fixing bolt 6. The two ends of the fixing bolt 6 are respectively sealed with the corrugated protective sleeve 5 and the inflatable bag tube 32.

[0041] The hot melt air sealing column 64 is made of hot melt material. The hot melt air sealing column 64 slides relative to the air flow channel. The manufacturing materials of the flammable film 63 include: polylactic acid film and flammable paper film.

[0042] In this embodiment, when an external fire occurs, the flammable film 63 located on the outside of the corrugated protective sleeve 5 burns after contacting the flame, and the hot melt gas sealing column 64 melts due to the high temperature. At this time, the inflatable bag tube 32 is exhausted through the air flow channel on the hollow heat-conducting plug 61, thereby suppressing combustion with carbon dioxide.

[0043] When the external fire source continues to burn and burns the corrugated protective sheath 5 and the outer insulating layer 4, the inflatable bag tube 32 is exposed. When the fire continues to burn, the inflatable bag tube 32 ruptures to release carbon dioxide and dry powder in a concentrated manner, thereby further protecting the wire core 1.

[0044] When the present invention is working normally, the flame-retardant filling layer 2 functions as the entire cable, and the air bag tube 32 is close to the outside of the cable and acts as a buffer to enhance the impact resistance of the cable, reduce the damage of the wire core 1 caused by external impact, and make it difficult for external impact to cause the outer layer of the cable to rupture. After the air bag tube 32 is ruptured by the impact, the dry powder stored in it can also ensure the fire prevention effect of the air bag tube 32 area for a longer period of time, providing time for the staff to maintain and replace it, thereby achieving comprehensive protection of the wire core 1.

[0045] Second implementation method:

[0046] Figure 4-7 As shown, a heat-conducting plug is installed in the middle of the flammable film 63, and a heat-conducting bundle line 34 is connected between the heat-conducting plug and the main reinforcement line 31. The heat-conducting bundle line 34 is fixedly connected to the hot melt gas sealing column 64. Multiple pairs of temperature sensors matching the fixing plugs 6 are installed in the main reinforcement line 31. The detection end of one temperature sensor is connected to the hot melt gas sealing column 64, and the detection end of the other temperature sensor is installed with a heat-conducting column close to the wire core 1;

[0047] A suitable temperature sensor, such as a thermocouple temperature sensor, is installed by a person skilled in the art;

[0048] The thermal bundle 34 includes an elastic thermally conductive section and a hot-melt connection section. The elastic thermally conductive section is made of an elastic thermally conductive material, and the hot-melt connection section is made of a material that is easily fused at high temperatures. Suitable materials, such as lead-antimony alloy wire and zinc wire, are selected by technicians in this field. The hot-melt connection section is located in the hollow thermally conductive plug 61. When the flammable film 63 is intact, the hot-melt air sealing column 64 is in contact with the flammable film 63, and the elastic thermally conductive section is in a stretched state.

[0049] In this embodiment, the heat-conducting bundle 34 serves to restrain the hot-melt gas sealing column 64, preventing the hot-melt gas sealing column 64 from moving outward from the hollow heat-conducting plug 61 under the action of air pressure, thereby ensuring that the hot-melt gas sealing column 64 can still perform the air-sealing function when the flammable film 63 accidentally falls off.

[0050] The heat-conducting harness 34 can transmit the external temperature of the cable to the temperature sensor to monitor the external temperature of the cable. When an external fire occurs, the temperature transmitted by the heat-conducting harness 34 is too high, and its hot-melt connection section melts. At this time, the heat-conducting harness 34 is disconnected, and the limit of the hot-melt gas sealing column 64 is released. When the flammable film 63 falls off or burns, the hot-melt gas sealing column 64 melts or is pushed out of the hollow heat-conducting plug 61 by the air flow. At this time, the carbon dioxide in the inflatable bag tube 32 is discharged to suppress combustion.

[0051] Two data lines are passed through the main reinforcement line 31, and each pair of temperature sensors is connected in parallel with the two data lines. The two ends of the data lines extend into the two inflatable bag tubes 32 respectively, and extend through the air flow channel to the outside of the fixing bolt 6. A wiring ring matching the data line is clamped on the corrugated protective cover 5, and the data line is electrically connected to the monitoring module through the wiring ring.

[0052] Outputting the temperature sensor data for monitoring the core 1 and the temperature sensor data for monitoring the external temperature of the cable through the data line;

[0053] It also includes an auxiliary monitoring system, which includes a processor outside the device, and the processor is connected to a monitoring module, a data processing module and an alarm module;

[0054] The monitoring module is used to collect monitoring data of the temperature sensors in each reinforced wiring harness 3;

[0055] The data processing module is used to process the monitoring data and determine whether the outer side of the cable is on fire or whether the core 1 is overheated based on the data processing results;

[0056] The alarm module sends out a corresponding alarm signal according to the judgment result of the data processing module, and the alarm module is connected to an alarm device.

[0057] The auxiliary monitoring system of this embodiment realizes real-time monitoring and early warning functions. By continuously monitoring the temperature changes of the cable through the reinforced wiring harness 3, the system can promptly detect abnormal situations, such as a fire on the outside of the cable or overheating of the core 1. When the monitored temperature data is not within the set safe temperature range, the alarm module will be immediately activated and an alarm will be issued to the operation and maintenance personnel through sound and light alarms or remote notifications so that corresponding emergency measures can be taken.

[0058] In summary, this solution provides flame retardant and buffering protection for the wire core 1 by strengthening the wire harness 3. When the strengthened wire harness 3 catches fire, it can respond quickly and release carbon dioxide for flame retardancy. It can also assist in real-time monitoring of the temperature inside and outside the cable to facilitate online monitoring of the cable.

[0059] In view of current actual needs, the protection scope of the above-mentioned implementation mode adopted in this application is not limited to this. Various changes made within the knowledge scope of technical personnel in this field without departing from the concept of this application still fall within the protection scope of the present invention.

Claims

1. A flame-retardant and fire-resistant power cable for photovoltaic power generation, comprising a core (1), characterized in that: The outer end of the wire core (1) is fixedly connected to a flame retardant filling layer (2), the outer end of the flame retardant filling layer (2) is provided with a plurality of evenly distributed threading grooves, a reinforcement wire harness (3) is passed through the threading groove, the reinforcement wire harness (3) comprises a main reinforcement wire (31), a plurality of evenly distributed inflatable bag tubes (32) are fixedly connected to the main reinforcement wire (31), the inflatable bag tube (32) covers one end of the main reinforcement wire (31) and closes the opening of the threading groove, the inflatable bag tube (32) is filled with carbon dioxide, a plurality of elastic support columns are fixedly connected to the inflatable bag tube (32), the elastic support columns are filled with dry powder, and a heat conductive film (33) is coated between the main reinforcement wire (31) and the inflatable bag tube (32); An outer insulating layer (4) covering a flame-retardant filling layer (2) is wrapped between the plurality of reinforced wiring harnesses (3); a corrugated protective sleeve (5) is sleeved on the outer insulating layer (4); and a plurality of evenly distributed fixing bolts (6) are connected between the corrugated protective sleeve (5) and the reinforced wiring harness (3); The fixing bolt (6) comprises a hollow heat-conducting bolt (61) plugged into the corrugated protective sleeve (5), an air flow channel is provided in the middle of the hollow heat-conducting bolt (61), an end cover (62) is fixedly connected to the top end of the hollow heat-conducting bolt (61), a flammable film (63) is laid on the end cover (62) to seal the opening of the air flow channel, and a hot melt gas sealing column (64) is plugged into the air flow channel.

2. The flame-retardant and fire-resistant power cable for photovoltaic power generation according to claim 1, characterized in that: Thermally conductive adhesive is filled between the reinforced wire harness (3), the wire duct and the outer insulating layer (4).

3. The flame-retardant and fire-resistant power cable for photovoltaic power generation according to claim 1, characterized in that: Each of the fixing bolts (6) corresponds to a position of an inflatable bag tube (32); the inflatable bag tube (32), the heat-conducting film (33) and the outer insulating layer (4) are all provided with mounting holes that match the fixing bolts (6); and the two ends of the fixing bolts (6) are respectively sealed and connected to the corrugated protective sleeve (5) and the inflatable bag tube (32).

4. The flame-retardant and fire-resistant power cable for photovoltaic power generation according to claim 1, characterized in that: The hot melt air sealing column (64) is made of a hot melt material, and the hot melt air sealing column (64) slides relative to the air flow channel. The manufacturing materials of the flammable film (63) include: a polylactic acid film and a flammable paper film.

5. The flame-retardant and fire-resistant power cable for photovoltaic power generation according to claim 1, characterized in that: A heat-conducting plug is installed in the middle of the flammable film (63), a heat-conducting bundle line (34) is connected between the heat-conducting plug and the main reinforcement line (31), and the heat-conducting bundle line (34) is fixedly connected to the hot melt gas sealing column (64). A plurality of pairs of temperature sensors matching the fixing bolts (6) are installed in the main reinforcement line (31), a detection end of one temperature sensor is connected to the hot melt gas sealing column (64), and a heat-conducting column close to the wire core (1) is installed on the detection end of the other temperature sensor.

6. The flame-retardant and fire-resistant power cable for photovoltaic power generation according to claim 5, characterized in that: It also includes an auxiliary monitoring system, which includes a processor outside the device, and the processor is connected to a monitoring module, a data processing module and an alarm module; The monitoring module is used to collect monitoring data of the temperature sensors in each reinforced wiring harness (3); The data processing module is used to process monitoring data and determine whether the outer side of the cable is on fire or whether the core (1) is overheated based on the data processing result; The alarm module sends out a corresponding alarm signal according to the judgment result of the data processing module, and the alarm module is connected to an alarm device.

7. The flame-retardant and fire-resistant power cable for photovoltaic power generation according to claim 6, characterized in that: The heat-conducting bundle (34) comprises an elastic heat-conducting section and a hot-melt connecting section, wherein the hot-melt connecting section is located in the hollow heat-conducting plug (61). When the flammable film (63) is intact, the hot-melt air-sealing column (64) is in contact with the flammable film (63), and the elastic heat-conducting section is in a stretched state.

8. The flame-retardant and fire-resistant power cable for photovoltaic power generation according to claim 7, characterized in that: Two data lines are passed through the main reinforcement line (31), and each pair of temperature sensors is connected in parallel with the two data lines. The two ends of the data lines extend into the two inflatable bag tubes (32) and pass through the air flow channel to the outside of the fixing bolt (6). A wiring ring matching the data line is clamped on the corrugated protective sleeve (5), and the data line is electrically connected to the monitoring module through the wiring ring.

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