Fire resistant, low flammable photovoltaic cable

Abstract

The utility model discloses a kind of fire-resistant and flame-retardant photovoltaic cables, including conductor, the outside of conductor is covered with shielding layer, the outside of shielding layer is covered with insulating layer, the outside of insulating layer is covered with flame-retardant inner layer, the outside of flame-retardant inner layer is covered with filling layer, the outside of filling layer is covered with fireproof isolation layer, metal pipe is installed between the fireproof isolation layer and filling layer, the metal pipe spiral winding is in the outer surface of filling layer, the outside of fireproof isolation layer is covered with flame-retardant outer layer.The utility model is filled with cooling water in flame-retardant ring inside, and it is connected using multiple heat-conducting rods between flame-retardant ring and flame-retardant ring, when fire appears outside, the heat concentrated in the local photovoltaic cable is spread to the whole photovoltaic cable, increase the difficulty of photovoltaic cable combustion, ensure the safety when photovoltaic cable is used.

Description

Technical Field

[0001] This utility model relates to the field of photovoltaic cable technology, specifically a fire-resistant and flame-retardant photovoltaic cable. Background Technology

[0002] A cable is an electrical or signal transmission device, usually consisting of several or several groups of conductors (at least two conductors per group) twisted together like a rope. Each group of conductors is insulated from each other and is often twisted around a central core. The entire cable is covered with a highly insulating outer layer. Cables are characterized by being internally energized and externally insulated. Cables are classified into various categories such as power cables, photovoltaic cables, and signal transmission cables.

[0003] Photovoltaic cables are mainly used in outdoor photovoltaic power plants with abundant solar thermal resources, and a small portion is used in photovoltaic power generation modules on rural rooftops. Since the laying environment is not a densely populated place, the requirements for the fire resistance (continuous power supply capacity under fire conditions) and combustion performance (the characteristics of flame propagation and heat generation and smoke generation under burning conditions) of the cables are not high. The existing VDE and UL standards only propose indicators for the combustion performance of individual cables.

[0004] However, with the changing application scenarios of photovoltaic cables, a large number of photovoltaic cables are now directly laid in cable trays and conduits inside buildings. Since ordinary photovoltaic cables are not fire-resistant and have a very low combustion performance rating, they pose a significant fire hazard. Therefore, they do not meet the current needs. In response, we have proposed a fire-resistant and flame-retardant photovoltaic cable. Utility Model Content

[0005] The purpose of this utility model is to provide a fire-resistant and flame-retardant photovoltaic cable to solve the problems mentioned in the background art, such as the large number of photovoltaic cables being directly laid in cable trays and conduits inside buildings due to the changing application of photovoltaic cables, which pose a great fire hazard because ordinary photovoltaic cables are not fire-resistant and have a very low combustion performance rating.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a fire-resistant and flame-retardant photovoltaic cable, comprising a conductor, a shielding layer on the outside of the conductor, an insulation layer on the outside of the shielding layer, a flame-retardant inner layer on the outside of the insulation layer, a filling layer on the outside of the flame-retardant inner layer, a fireproof isolation layer on the outside of the filling layer, a metal tube installed between the fireproof isolation layer and the filling layer, the metal tube being spirally wound around the outer surface of the filling layer, and a flame-retardant outer layer on the outside of the fireproof isolation layer.

[0007] Preferably, the raw materials for the flame-retardant inner layer and the flame-retardant outer layer are halogen-free flame retardants prepared by extrusion injection molding.

[0008] Preferably, the raw material of the filler layer is glass fiber, and the filler layer is formed by wrapping it around the outside of the flame-retardant inner layer with glass.

[0009] Preferably, the fireproof isolation layer includes a rubber outer sleeve and a rubber inner sleeve, the ends of which are fitted together and heat-fused.

[0010] Preferably, a flame-retardant ring and a heat-conducting rod are installed between the rubber outer sleeve and the rubber inner sleeve. The flame-retardant ring is arranged linearly along the axial direction of the rubber outer sleeve and the rubber inner sleeve, and the heat-conducting rod passes through the flame-retardant ring and is distributed in a circular array around the axis of the rubber outer sleeve and the rubber inner sleeve.

[0011] Preferably, the flame-retardant ring is hollow and filled with cooling water, and a connecting ring is fixed between each pair of adjacent flame-retardant rings. The connecting ring is made of rubber.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] 1. This utility model fills the flame-retardant ring with cooling water and connects the flame-retardant rings with multiple heat-conducting rods. In the event of an external fire, the heat concentrated in a local area of ​​the photovoltaic cable is distributed evenly to the entire photovoltaic cable, increasing the difficulty of the photovoltaic cable burning and ensuring the safety of the photovoltaic cable during use.

[0014] 2. The flame-retardant ring of this utility model is filled with cooling water, which gives the flame-retardant ring a good elastic buffering capacity, enhances the compressive strength of the photovoltaic cable, and prevents the internal conductor of the photovoltaic cable from breaking due to excessive external pressure. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0016] Figure 2 This is a side view of the metal tube of this utility model;

[0017] Figure 3 This is a schematic diagram of the fireproof isolation layer of this utility model;

[0018] Figure 4 This is a cross-sectional view of the flame-retardant ring of this utility model.

[0019] In the diagram: 1. Conductor; 2. Shielding layer; 3. Insulation layer; 4. Flame-retardant inner layer; 5. Filler layer; 6. Metal tube; 7. Fireproof isolation layer; 71. Rubber outer jacket; 72. Rubber inner sleeve; 73. Flame-retardant ring; 74. Heat-conducting rod; 75. Connecting ring; 8. Flame-retardant outer layer. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0021] like Figure 1 and Figure 2 As shown, a fire-resistant and flame-retardant photovoltaic cable has a shielding layer 2 on the outside of the conductor 1, an insulation layer 3 on the outside of the shielding layer 2, a flame-retardant inner layer 4 on the outside of the insulation layer 3, a filling layer 5 on the outside of the flame-retardant inner layer 4, a fireproof isolation layer 7 on the outside of the filling layer 5, a metal tube 6 installed between the fireproof isolation layer 7 and the filling layer 5, the metal tube 6 being spirally wound on the outer surface of the filling layer 5, and a flame-retardant outer layer 8 on the outside of the fireproof isolation layer 7.

[0022] The flame-retardant inner layer 4 and the flame-retardant outer layer 8 are made from halogen-free flame retardants and prepared by extrusion injection molding. The flame-retardant inner layer 4 and the flame-retardant outer layer 8 have high ignition points, which prevents the flame from directly igniting the photovoltaic cable.

[0023] The raw material of the filler layer 5 is glass fiber. The filler layer 5 is formed by wrapping the glass around the outside of the flame-retardant inner layer 4. The glass is not easy to burn, which improves the heat resistance of the photovoltaic cable.

[0024] like Figure 3 and Figure 4 As shown, the fireproof isolation layer 7 includes a rubber outer sleeve 71 and a rubber inner sleeve 72. The ends of the rubber outer sleeve 71 and the rubber inner sleeve 72 are fitted together and heat-fused. A flame-retardant ring 73 and a heat-conducting rod 74 are installed between the rubber outer sleeve 71 and the rubber inner sleeve 72. The flame-retardant ring 73 is arranged linearly along the axial direction of the rubber outer sleeve 71 and the rubber inner sleeve 72. The heat-conducting rod 74 passes through the flame-retardant ring 73 and is distributed in a circular array around the axis of the rubber outer sleeve 71 and the rubber inner sleeve 72. The interior of the flame-retardant ring 73 is hollow and filled with cooling water. A connecting ring 75 is fixed between each two adjacent flame-retardant rings 73. The connecting ring 75 is made of rubber. When the flame burns the photovoltaic cable and causes the local temperature of the photovoltaic cable to rise, the flame-retardant ring 73 and the heat-conducting rod 74 guide and distribute the heat concentrated in the local area of ​​the photovoltaic cable to the entire photovoltaic cable, reducing the temperature of the photovoltaic cable, increasing the difficulty of burning the photovoltaic cable, and ensuring the safety of the photovoltaic cable during use.

[0025] Working principle: Cooling water is filled into the flame-retardant ring 73, and then the flame-retardant ring 73 is sealed. Adjacent flame-retardant rings 73 are then connected via connecting rings 75. A heat-conducting rod 74 is then passed through the inside of the flame-retardant ring 73. At this point, a rubber inner sleeve 72 is passed through the middle of the flame-retardant ring 73, and a rubber outer sleeve 71 is used to cover the flame-retardant ring 73 and the heat-conducting rod 74. After the rubber outer sleeve 71 and rubber inner sleeve 72 are installed, their ends are heat-fused together. Next, the shielding layer 2, insulating layer 3, flame-retardant inner layer 4, and filling layer 5 are sequentially placed over the conductor 1. Finally, a metal... The metal tube 6 is wrapped around the outside of the filler layer 5. After the metal tube 6 is installed, the fireproof isolation layer 7, consisting of the rubber outer sleeve 71, the rubber inner sleeve 72, the flame-retardant ring 73, and the heat-conducting rod 74, is completely wrapped around the outside of the metal tube 6. Finally, the flame-retardant outer layer 8 is wrapped around the outside of the fireproof isolation layer 7 to complete the assembly of the photovoltaic cable. When the external transmitter tube catches fire and causes the local temperature of the photovoltaic cable to rise, the cooling water inside the flame-retardant ring 73 will transfer the heat to the photovoltaic cable for absorption. The absorbed heat will be evenly distributed to the entire photovoltaic cable through the heat-conducting rod 74, reducing the temperature of the photovoltaic cable, increasing the difficulty of the photovoltaic cable burning, and ensuring the safety of the photovoltaic cable during use.

[0026] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A fire-resistant and flame-retardant photovoltaic cable, comprising a conductor (1), a shielding layer (2) sleeved on the outside of the conductor (1), an insulation layer (3) sleeved on the outside of the shielding layer (2), and a flame-retardant inner layer (4) sleeved on the outside of the insulation layer (3), characterized in that: The flame-retardant inner layer (4) is covered with a filling layer (5), and the filling layer (5) is covered with a fireproof isolation layer (7). A metal tube (6) is installed between the fireproof isolation layer (7) and the filling layer (5). The metal tube (6) is spirally wound around the outer surface of the filling layer (5). The fireproof isolation layer (7) is covered with a flame-retardant outer layer (8).

2. A fire resistant, low flammable photovoltaic cable according to claim 1, characterized in that: The flame-retardant inner layer (4) and flame-retardant outer layer (8) are made from halogen-free flame retardants through an extrusion injection molding process.

3. A fire resistant, flame retardant photovoltaic cable according to claim 1, characterized in that: The raw material of the filling layer (5) is glass fiber, and the filling layer (5) is formed by glass limiting and winding around the outside of the flame-retardant inner layer (4).

4. A fire resistant, low flammable photovoltaic cable according to claim 1, characterized in that: The fireproof isolation layer (7) includes a rubber outer sleeve (71) and a rubber inner sleeve (72), the ends of which are fitted together and heat-fused.

5. A fire-resistant and flame-retardant photovoltaic cable according to claim 4, characterized in that: A flame-retardant ring (73) and a heat-conducting rod (74) are installed between the rubber outer sleeve (71) and the rubber inner sleeve (72). The flame-retardant ring (73) is arranged linearly along the axial direction of the rubber outer sleeve (71) and the rubber inner sleeve (72). The heat-conducting rod (74) passes through the flame-retardant ring (73) and is distributed in a circular array around the axis of the rubber outer sleeve (71) and the rubber inner sleeve (72).

6. The fire-resistant and flame-retardant photovoltaic cable according to claim 5, characterized in that: The flame-retardant ring (73) is hollow inside and filled with cooling water. A connecting ring (75) is fixed between each two adjacent flame-retardant rings (73), and the connecting ring (75) is made of rubber.

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