Flame-retardant fireproof power cable for photovoltaic power generation

Abstract

The invention relates to a flame-retardant fireproof power cable for photovoltaic power generation in the field of cables, which comprises a wire core, the outer end of the wire core is fixedly connected with a flame-retardant filling layer, the outer end of the flame-retardant filling layer is provided with a plurality of uniformly distributed threading grooves, a reinforced wire harness is arranged in the threading grooves in a penetrating manner, and the reinforced wire harness comprises a main reinforced wire. The main reinforcing line is fixedly connected with a plurality of uniformly distributed air inflation bag pipes, and heat conduction films are wrapped between the main reinforcing line and the air inflation bag pipes; an outer insulating layer covered with a flame-retardant filling layer is coated among the plurality of reinforced wire harnesses, a corrugated protective sleeve is sleeved on the outer insulating layer, and a plurality of uniformly distributed fixing bolts are connected between the corrugated protective sleeve and the reinforced wire harnesses; flame-retardant protection and buffer protection are carried out on the wire core through the reinforced wire harness, quick response and carbon dioxide release can be carried out for flame retardance when the reinforced wire harness is on fire, and real-time monitoring of the temperature inside and outside the cable can be assisted, so that online monitoring of the cable is facilitated.

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 field of cables. 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, polyvinyl chloride (PVC), etc. Low smoke zero halogen materials produce less smoke and corrosive gases when burned, which helps to reduce visibility reduction and toxic gas generation during fires. Mineral filled polyolefin materials improve 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 cable flame retardant effect, 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] The specification of Chinese invention patent CN118039235B discloses a fire-retardant high-voltage cable, including a core, an insulating layer, a fireproof layer, a functional layer and a jacket layer, the outer surface of the core is provided with an insulating layer, the outer surface of the insulating layer is provided with a fireproof layer, the outer surface of the fireproof layer is provided with a functional layer, the outer surface of the fireproof layer is provided with a jacket layer, a start-up cavity is provided in the radial direction on the side where the functional layer and the fireproof layer are attached, the end of the start-up cavity away from the fireproof layer is connected to one end of the dry powder bin, the other end of the dry powder bin is connected to the collection bin, the bottom of the start-up cavity is provided with a start-up plate, and the top of the start-up cavity is provided with a transmission plate. This application has the effect of improving the untimely flame retardant after the cable heats up and spontaneously ignites.

[0006] The specification of Chinese invention patent CN110580980B discloses a flame-retardant and pressure-resistant cable, comprising more than one fixed part, wherein an elastic fire extinguishing assembly is fixedly arranged between adjacent fixed parts, and the elastic fire extinguishing assembly is provided with more than one outer protective sheet on the outside, and the more than one outer protective sheet is arranged around the fixed part in a circle at equal intervals, and is spliced ​​with each other to form a circular outer layer. The cable of the invention adopts a different installation structure, so that the cable has a very strong pressure-resistant buffer force, and has a better fire extinguishing performance, which greatly increases the service life of the cable. Existing cables are flame retardant only by a protective layer made of fireproof material. If the protective layer breaks accidentally, the fireproof 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 a fire near the cable in time. Summary of the invention

[0007] In view of the above-mentioned prior art, 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 fireproof material. If the protective layer is accidentally ruptured, the fireproof performance of the cable will be greatly reduced. In addition, it is inconvenient to monitor the temperature of the cable during use, making it inconvenient to discover a fire near the cable in time.

[0008] In order 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 is fixedly connected to the outer end of the wire core, a plurality of evenly distributed threading grooves are opened at the outer end of the flame-retardant filling layer, a reinforcing wire harness is passed through the threading groove, the reinforcing wire harness comprises a main reinforcing wire, a plurality of evenly distributed inflatable bag tubes are fixedly connected to the main reinforcing wire, the inflatable bag tube covers one end of the main reinforcing wire and closes the opening of the threading groove, the inflatable bag tube is filled with carbon dioxide, a plurality of elastic support columns are fixedly connected to the inflatable bag tube, the elastic support columns are filled with dry powder, and a heat-conductive film is coated between the main reinforcing wire and the inflatable bag tube; An outer insulating 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 insulating layer, and multiple evenly distributed fixing bolts are connected between the corrugated protective sleeve and the reinforced wiring harnesses; The fixing plug includes a hollow heat-conducting plug inserted on the corrugated protective sleeve, an air flow channel is opened in the middle of the hollow heat-conducting plug, an end cover is fixedly connected to the top of the hollow heat-conducting plug, a flammable film is laid on the end cover to close the opening of the air flow channel, and a hot-melt gas sealing column is inserted in the air flow channel.

[0009] 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 the fixing bolt to assist in flame retardancy.

[0010] As a further improvement of the present application, thermally conductive adhesive is filled between the reinforced wire harness, the wire duct and the outer insulation layer.

[0011] As a further improvement of the present application, each fixing bolt corresponds to the position of an inflatable bag tube, and the inflatable bag tube, the thermal conductive film and the outer insulating layer are all provided with mounting holes matching the fixing bolt, and the two ends of the fixing bolt are respectively sealed and connected to the corrugated protective sleeve and the inflatable bag tube.

[0012] 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 relatively with the air flow channel, and the manufacturing materials of the flammable film include: polylactic acid film and flammable paper film.

[0013] As another improvement of the present application, a thermal plug is installed in the middle of the flammable film, a thermal bundle line is connected between the thermal plug and the main reinforcement line, the thermal bundle line is fixedly connected to the hot melt air sealing column, and multiple pairs of temperature sensors matching the fixing 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.

[0014] As another improved supplement of 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; The monitoring module is used to collect monitoring data of the temperature sensors in each reinforced wiring harness; 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 according to the data processing results; 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 with an alarm device.

[0015] As another improved supplement of the present application, the thermally conductive bundle includes an elastic thermally conductive section and a hot-melt connecting section. The hot-melt connecting section is located in the hollow thermally conductive plug. When the flammable film is intact, the hot-melt air sealing column is in contact with the flammable film, and the elastic thermally conductive section is in a stretched state.

[0016] As another improvement supplement of the present application, two data lines are passed through the main reinforcement line, each pair of temperature sensors is connected in parallel with the two data lines, both ends of the data lines extend into the two inflatable bag tubes respectively, and extend to the outside of the fixing plug through the air flow channel, and 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.

[0017] In summary, this solution provides flame retardant and buffer 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 to facilitate online monitoring of the cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a three-dimensional diagram of a cable according to the first embodiment of the present application; Figure 2 This is an exploded view of the cable according to the first embodiment of the present application; Figure 3 This is a partial cross-sectional view of a cable according to the first embodiment of the present application; Figure 4 This is a cross-sectional view of a cable according to the second embodiment of the present application; Figure 5 for Figure 4 The structural diagram at A in the middle; Figure 6 This is a schematic diagram of external cable wiring in the second embodiment of the present application; Figure 7 This is a block diagram of the auxiliary monitoring system of the second implementation mode of the present application.

[0019] Description of the numbers in the figure: 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 cover; 63. Flammable film; 64. Hot melt air sealing column. DETAILED DESCRIPTION

[0020] The following describes two implementation modes of the present application in detail with reference to the accompanying drawings.

[0021] The first implementation method: Figure 1-3 It is shown that a flame-retardant and fire-resistant power cable for photovoltaic power generation comprises a core 1, the outer end of the core 1 is fixedly connected with a flame-retardant filling layer 2, and 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 mixed with a flame retardant; 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 threaded in 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 in the inflatable bag tube 32, and the elastic support columns are filled with dry powder; the dry powder is released after the inflatable bag tube 32 is ruptured; the heat-conducting film 3 plays a role in heat conduction and heat dissipation, and the heat-conducting film 33 assists the wire core 1 in heat dissipation; An outer insulating layer 4 covering the flame-retardant filling layer 2 is wrapped between the multiple reinforced wire bundles 3 , and a thermal conductive adhesive is filled between the reinforced wire bundles 3 and the wire threading grooves and the outer insulating layer 4 .

[0022] 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 plug 6 includes a hollow heat-conducting plug 61 inserted into the corrugated protective sleeve 5. The hollow heat-conducting plug 61 is made of a heat-resistant metal material. An air flow channel is opened in the middle of the hollow heat-conducting plug 61. An end cover 62 is fixedly connected to the top of the hollow heat-conducting plug 61. A flammable film 63 is laid on the end cover 62 to close the opening of the air flow channel. A hot-melt air-sealing column 64 is inserted in the air flow channel, and the hot-melt air-sealing column 64 is a hollow structure.

[0023] Each fixing bolt 6 corresponds to a position of an inflatable bag tube 32 . The inflatable bag tube 32 , the heat 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 and connected to the corrugated protective sleeve 5 and the inflatable bag tube 32 .

[0024] The hot-melt air-sealing column 64 is made of a hot-melt material. The hot-melt air-sealing column 64 slides relatively with the air flow channel. The manufacturing materials of the flammable film 63 include: a polylactic acid film and a flammable paper film.

[0025] In this embodiment, when an external fire occurs, the flammable film 63 located outside 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, so that the combustion is suppressed by carbon dioxide. After the external fire source continues to burn and burns the corrugated protective cover 5 and the outer insulating layer 4, the inflatable bag tube 32 is exposed. After continuing to burn, the inflatable bag tube 32 ruptures to release carbon dioxide and dry powder in a concentrated manner, which plays a further flame retardant role, thereby protecting the wire core 1; When the present solution is working normally, the flame retardant filling layer 2 functions as the whole cable, and the inflatable 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 the external impact to cause the outer layer of the cable to rupture. After the inflatable bag tube 32 is ruptured by the impact, the dry powder stored in it can also ensure the fireproof effect of the inflatable bag tube 32 area for a long time, providing time for the staff to maintain and replace it, thereby achieving comprehensive protection of the wire core 1.

[0026] Second implementation method: Figure 4-7 It is shown 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 bolt 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; The installation is performed by a person skilled in the art using a suitable temperature sensor, such as a thermocouple temperature sensor; The thermal bundle 34 includes an elastic thermally conductive section and a hot-melt connecting section. The elastic thermally conductive section is made of an elastic thermally conductive material, and the hot-melt connecting section is made of a material that is easy to melt at high temperatures. The technical personnel in this field select appropriate materials to set it, such as lead-antimony alloy wire and zinc wire. The hot-melt connecting 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.

[0027] In this embodiment, the heat-conducting bundle 34 serves to restrain the hot-melt gas-sealing column 64, thereby preventing the hot-melt gas-sealing column 64 from moving out of the hollow heat-conducting plug 61 under the action of air pressure, thereby ensuring that the hot-melt gas-sealing column 64 can still play a gas-sealing role when the flammable film 63 accidentally falls off; 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 the 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 comes out of the hollow heat-conducting plug 61 under the action of air flow. At this time, the carbon dioxide in the inflatable bag tube 32 is discharged to suppress combustion. 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 to the outside of the fixing bolt 6 through the air flow channel. 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.

[0028] 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; It also includes an auxiliary monitoring system, which includes a processor outside the device, and a monitoring module, a data processing module and an alarm module are connected to the processor; 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 the monitoring data and determine whether the outer side of the cable is on fire or whether the core 1 is overheated according to the data processing results; 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 with an alarm device.

[0029] The auxiliary monitoring system of this embodiment realizes real-time monitoring and early warning functions. By strengthening the wiring harness 3 to continuously monitor the temperature changes of the cable, 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.

[0030] 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.

[0031] In view of current practical needs, the above-mentioned implementation mode adopted in this application is not limited to the scope of protection. 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 scope of protection 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 reinforcing wire harness (3) is passed through the threading groove, the reinforcing wire harness (3) comprises a main reinforcing wire (31), a plurality of evenly distributed inflatable bag tubes (32) are fixedly connected to the main reinforcing wire (31), the inflatable bag tube (32) covers one end of the main reinforcing 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 reinforcing wire (31) and the inflatable bag tube (32); An outer insulating layer (4) covering the flame-retardant filling layer (2) is coated between the plurality of the 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 harnesses (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 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. A flame-retardant and fire-resistant power cable for photovoltaic power generation according to claim 1, characterized in that: Thermally conductive glue is filled between the reinforced wire harness (3) and the wire threading groove 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 conductive film (33) and the outer insulating layer (4) are all provided with mounting holes matching 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 airflow channel. The manufacturing material of the flammable film (63) includes: 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 of the temperature sensors 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. A 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 a monitoring module, a data processing module and an alarm module are connected to the processor; The monitoring module is used to collect monitoring data of the temperature sensor in each reinforced wiring harness (3); 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 wire 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 with an alarm device.

7. A 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), and 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 inserted into the main reinforcement line (31), and each pair of the temperature sensors is connected in parallel to 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 extend 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 via the wiring ring.

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