Flame retardant B1 grade fire resistant control cable for rail transit

Abstract

The present application discloses a flame-retardant B1-class fire-resistant control cable for rail transit, including a cable body and a heat dissipation unit. The cable body includes an outer sheath, and the outer sheath has two embedded grooves and a detection groove located between the two embedded grooves; the heat dissipation unit includes a threading rope, multiple connection units, multiple guide units, multiple airflow generating units, and a mounting plate unit extending along the length direction of the cable body. The cable of the present application has multiple layers of wrapping layers with flame retardant effects, oxygen insulation layers, and fire-resistant layers, so that the cable has better flame retardant effects. And a temperature measuring optical fiber is installed, so that it has a temperature measuring function. In the case of no active heat dissipation, the strip through hole can allow hot air to rise, so that the natural heat dissipation effect is good. When actively dissipating heat, the heat dissipation airflow can flow along the channel between the cable body and the bottom plate, and flow upward and outward from the gap between the bottom plate and the guide plate, so as to take away the heat on the surface of the cable body well.

Description

Technical Field

[0001] The present invention relates to the field of cable technology, and more specifically, to a flame-retardant B1-grade fire-resistant control cable for rail transit. Background Art

[0002] Control cables are mainly used to transmit control signals, measurement signals, protection signals and metering signals, etc., and are widely used in rail transit, industrial automation, power systems and other fields. In rail transit systems, control cables are used to connect various control devices, such as signal systems, communication systems, power supply systems, etc., to ensure the safety of train operation.

[0003] Existing control cables may have deficiencies in flame retardancy, especially in high temperature or fire conditions, where they burn quickly, which may cause the fire to spread rapidly, increasing the difficulty of fire control and personnel evacuation. When running at high loads, the current and voltage inside the cable may increase, causing the cable temperature to rise. If the heat dissipation performance of the cable is poor, it may cause the cable to overheat and even cause a fire. Existing control cables may lack effective heat dissipation structures or heat dissipation channels in their design, making it difficult for the cable to dissipate heat during operation, exacerbating the overheating problem of the cable. Traditional control cables usually do not have a temperature measurement function and cannot monitor the temperature changes of the cable in real time. This makes it difficult to detect and deal with the overheating risks that may exist during the operation of the cable in a timely manner. Summary of the invention

[0004] The present invention aims to overcome the defects of the prior art and provide a flame retardant B1 grade fire resistant control cable for rail transit.

[0005] In order to achieve the above-mentioned objectives, the present invention provides the following technical solutions: a control cable, comprising a cable body and a heat dissipation unit, the cable body comprising an outer sheath, the outer sheath having two embedding grooves and a detection groove located between the two embedding grooves; the heat dissipation unit comprises a threading rope, a plurality of connecting units, a plurality of guide units, a plurality of airflow generating units and a mounting plate unit extending along the length direction of the cable body, the connecting unit and the guide unit are both passed through by the threading rope and the plurality of connecting units and the plurality of guide units are alternately distributed; the connecting unit is used to connect the cable body and the mounting plate unit, and the airflow generating unit is installed at the mounting plate unit.

[0006] Further, the connecting unit includes a base plate, two strip embedded blocks connected to the base plate, a strip embedded block connected to the base plate and located between the two strip embedded blocks, and two T-shaped rails connected to the base plate, the two strip embedded blocks are respectively embedded in two embedded grooves, the strip embedded block is inserted into the detection groove, and the strip embedded block has a first rope threading channel through which the rope is passed; the guide unit includes a strip socket inserted into the detection groove and two guide plates connected to the strip sockets, the strip socket has a second rope threading channel through which the rope is passed; the mounting plate unit includes a bottom plate with an arc-shaped cross-section and two strip protrusions connected to the bottom plate and extending along the length direction of the bottom plate, and the strip protrusions have T-shaped slots that cooperate with the T-shaped rails.

[0007] Furthermore, a temperature measuring optical fiber extending along the length direction of the cable body is installed between the detection groove and the strip-shaped plug-in block.

[0008] In some embodiments, a plurality of temperature sensors are installed on the bottom plate, and the plurality of temperature sensors are distributed at equal intervals.

[0009] Therefore, the temperature sensor can serve as a supplement to the temperature measurement by optical fiber.

[0010] Furthermore, the bottom plate has two rows of strip through holes, two strip protrusions are located between the two rows of strip through holes, the bottom plate has multiple mounting positions, the airflow generating unit is installed at the mounting position, the mounting position has two first mounting through holes and a first plug hole, the airflow generating unit comprises an upper mounting portion, a lower mounting portion and two screwing portions, the upper mounting portion comprises an arc panel and two upper cylinder portions, the arc panel has a second plug hole and two connecting holes connected with the upper cylinder portion, the upper cylinder portion has an external thread, the lower mounting portion comprises a fixing plate, an insertion rod capable of being inserted into the first plug hole and the second plug hole, and two second mounting through holes, the screwing portion comprises a lower cylinder portion and a cooling fan installed in the lower cylinder portion, the lower cylinder portion has an internal thread, the upper cylinder portion passes through the first mounting through hole and the second mounting through hole and is screwed and fixed to the lower cylinder portion; the lower surface of the substrate has a strip limiting groove into which the end of the insertion rod is inserted.

[0011] The hot air around the cable body can flow upward through the strip-shaped through holes, thereby taking away the heat around the cable body, thereby having a better natural heat dissipation effect.

[0012] Furthermore, the length of the connection unit is equal to the length of the guide unit. The number of the two rows of strip-shaped through holes is equal and one-to-one corresponding, and there is one connection unit between two corresponding strip-shaped through holes.

[0013] Therefore, the airflow generated by the heat dissipation fan is not easy to flow away from the strip-shaped through holes due to the obstruction of the connection unit.

[0014] Furthermore, the length of the strip-shaped through hole is smaller than the length of the connecting unit and larger than four fifths of the length of the connecting unit.

[0015] Therefore, the connecting unit can better shield the strip-shaped through hole.

[0016] Furthermore, the upper surface of the fixing plate is an arc surface, and the lower surface is a plane; both sides of the fixing plate are provided with strip-shaped placement grooves.

[0017] The fixing plate can thereby better match the base plate and the screw-on portion.

[0018] Furthermore, the two tightening parts at the airflow generating unit are respectively the first tightening part and the second tightening part, the strip placement grooves on both sides of the fixing plate are respectively the first strip placement groove and the second strip placement groove, the first strip placement groove contains the first power supply cable, and all the cooling fans at the first tightening part are connected to the first power supply cable in parallel; the second strip placement groove contains the second power supply cable, and all the cooling fans at the second tightening part are connected to the second power supply cable in parallel.

[0019] The two cooling fans at the airflow generating unit are powered by two power supply cables respectively, so that the two cooling fans at the airflow generating unit can be controlled independently.

[0020] Furthermore, the number of the installation positions is equal to the number of the strip through holes in a row of strip through holes, and each installation position is located between two corresponding strip through holes; and at least one installation position between any two adjacent installation positions is installed with the airflow generating unit.

[0021] Thereby providing comprehensive heat dissipation effect.

[0022] Furthermore, the top of the strip plug is in the shape of an arc groove; the width of the strip plug, the width of the strip socket and the width of the detection groove are equal; the guide plate is in the shape of an arc, two guide plates are located on both sides of the strip seat, and there is a gap between the bottom end of the guide plate and the bottom plate.

[0023] Therefore, the heat dissipation airflow can flow out from the gap, resulting in better heat dissipation for the cable body.

[0024] Furthermore, the strip-shaped embedded block includes a cylindrical block and a strip-shaped connecting seat connecting the cylindrical block and the base plate; the embedded groove includes a groove body with a circular cross-section that matches the cylindrical block and a strip-shaped connecting groove that communicates with the groove body.

[0025] This ensures that the heat dissipation unit can be stably connected to the cable body.

[0026] Furthermore, the cable body comprises an outer sheath, a first wrapping layer, an armor layer, a second wrapping layer, an oxygen-isolating layer, a shielding layer and a third wrapping layer from the outside to the inside, wherein the third wrapping layer has a cable core, and the cable core comprises a fire-resistant layer, an insulating layer and a conductor from the outside to the inside.

[0027] Furthermore, the first wrapping layer, the second wrapping layer and the third wrapping layer are all mica tape wrapping layers; the oxygen isolation layer is a low-smoke halogen-free flame retardant layer; the insulating layer is a silicone rubber insulating layer, the fire-resistant layer is a mineral flame retardant layer, and the outer sheath is a polyethylene outer sheath.

[0028] Therefore, the cable has good fire retardant properties.

[0029] Beneficial effects:

[0030] 1. The cable of the present application has multiple layers of flame-retardant wrapping layers, oxygen-isolating layers, and fire-resistant layers, so that the cable has a better flame-retardant effect.

[0031] 2. The cable of the present application is equipped with a temperature measuring optical fiber, thus having a temperature measuring function. Without active heat dissipation, the strip-shaped through holes can allow hot air to rise, thereby achieving a good natural heat dissipation effect.

[0032] 3. When the cable of the present application actively dissipates heat, the heat dissipation airflow can flow along the channel between the cable body and the base plate, and flow upward and outward from the gap between the base plate and the guide plate, thereby effectively taking away the heat on the surface of the cable body. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 Cable diagram

[0034] Figure 1A This is an enlarged view of area 1A;

[0035] Figure 2 It is a schematic diagram of the separation of cable components;

[0036] Figure 2A This is an enlarged view of area 2A;

[0037] Figure 2B This is an enlarged view of area 2B;

[0038] Figure 3 A schematic diagram of the assembly of a threading rope, a plurality of connection units, and a plurality of diversion units;

[0039] Figure 4 It is a schematic diagram of assembling the connection unit and the mounting plate unit;

[0040] Figure 5 It is a schematic diagram after the strip-shaped embedding block is embedded in the embedding groove.

[0041] Explanation of reference numerals: 1 outer sheath; 1.1 embedding groove; 1.2 detection groove; 2 rope threading; 3 connection unit; 3.1 base plate; 3.1.1 strip limiting groove; 3.2 strip embedding block; 3.3 strip plug block; 3.4 T-shaped plug rail; 3.5 first rope threading channel; 4 guide unit; 4.1 strip socket; 4.2 guide plate; 4.3 second rope threading channel; 5 mounting plate unit; 5.1 bottom plate; 5.1.1 strip through hole; 5.1.2 first mounting through hole; 5.1.3 first plug hole; 5.2 strip-shaped protrusion; 5.3 T-shaped slot; 6 temperature measuring optical fiber; 7.1 arc panel; 7.1.1 second plug hole; 7.1.2 connecting hole; 7.2 upper tube; 7.3 fixing plate; 7.3.1 strip placement groove; 7.4 plug rod; 7.5 second installation through hole; 7.6 lower tube; 7.7 cooling fan; 8 first wrapping layer; 9 armor layer; 10 second wrapping layer; 11 oxygen insulation layer; 12 shielding layer; 13 third wrapping layer; 14 fire-resistant layer; 15 insulating layer; 16 conductor. DETAILED DESCRIPTION

[0042] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0043] The present invention provides Figure 1-5A flame-retardant B1 grade fire-resistant control cable for rail transit is shown, comprising a cable body and a heat dissipation unit, wherein the cable body comprises an outer sheath 1, and the outer sheath 1 has two embedding grooves 1.1 and a detection groove 1.2 located between the two embedding grooves 1.1; the heat dissipation unit comprises a threading rope 2, a plurality of connecting units 3, a plurality of guide units 4, a plurality of airflow generating units and a mounting plate unit 5 extending along the length direction of the cable body, wherein the connecting units and the guide units are both passed through by the threading rope 2 and the plurality of connecting units and the plurality of guide units are alternately distributed; the connecting unit is used to connect the cable body and the mounting plate unit, and the airflow generating unit is installed at the mounting plate unit. The connecting unit 3 includes a base plate 3.1, two strip-shaped embedded blocks 3.2 connected to the base plate 3.1, a strip-shaped inserted block 3.3 connected to the base plate 3.1 and located between the two strip-shaped embedded blocks 3.2, and two T-shaped inserted rails 3.4 connected to the base plate 3.1. The two strip-shaped embedded blocks 3.2 are respectively embedded in two embedded grooves 1.1, and the strip-shaped inserted block 3.3 is inserted into the detection groove 1.2. The strip-shaped inserted block 3.3 has a first rope threading channel 3.5 through which the rope 2 passes; the guide unit 4 includes a strip socket inserted into the detection groove 1.2. 4.1 and two guide plates 4.2 connected to the strip socket 4.1, the strip socket 4.1 has a second rope threading channel 4.3 through which the rope 2 passes; the mounting plate unit 5 includes a bottom plate 5.1 with an arc-shaped cross-section and two strip-shaped protrusions 5.2 connected to the bottom plate 5.1 and extending along the length direction of the bottom plate 5.1, and the strip protrusions 5.2 are provided with T-shaped slots 5.3 that cooperate with the T-shaped plug rails 3.4; a temperature measuring optical fiber 6 (or called a temperature measuring optical cable) extending along the length direction of the cable body is installed between the detection slot 1.2 and the strip plug block 3.3.The bottom plate 5.1 has two rows of strip through holes 5.1.1, and two strip convex blocks 5.2 are located between the two rows of strip through holes 5.1.1. The bottom plate 5.1 has a plurality of mounting positions, and the airflow generating unit is mounted at the mounting positions, and the mounting positions have two first mounting through holes 5.1.2 and a first plug hole 5.1.3. The airflow generating unit includes an upper mounting portion, a lower mounting portion and two screwing portions, and the upper mounting portion includes an arc panel 7.1 and two upper cylinders 7.2. The arc panel 7.1 has a second plug hole 7.1.1 and two connecting holes 7.1.3 connected to the upper cylinder 7.2. 1.2, the upper cylinder 7.2 has an external thread, the lower mounting portion includes a fixing plate 7.3, an insertion rod 7.4 that can be inserted into the first plug hole 5.1.3 and the second plug hole 7.1.1, and two second mounting through holes 7.5, the tightening portion includes a lower cylinder 7.6 and a cooling fan 7.7 installed in the lower cylinder 7.6, the lower cylinder 7.6 has an internal thread, the upper cylinder 7.2 passes through the first mounting through hole 5.1.2 and the second mounting through hole 7.5 and is tightened and fixed to the lower cylinder 7.6; the lower surface of the base plate 3.1 has a strip-shaped limit groove 3.1.1 into which the end of the insertion rod 7.4 is inserted.

[0044] The length of the connection unit is equal to the length of the guide unit; the number of the two rows of strip through holes 5.1.1 is equal and one-to-one corresponding, and there is one connection unit between two corresponding strip through holes 5.1.1. The upper surface of the fixing plate 7.3 is an arc surface, and the lower surface is a plane; both sides of the fixing plate 7.3 have strip placement grooves 7.3.1. The number of the installation positions is equal to the number of strip through holes in a row of strip through holes, and each installation position is located between two corresponding strip through holes; at least one installation position between any two adjacent installation positions is installed with the airflow generating unit. The top of the strip plug 3.3 is in the shape of an arc groove; the width of the strip plug 3.3, the width of the strip socket 4.1 and the width of the detection slot 1.2 are equal; the guide plate 4.2 is in the shape of an arc surface, and two guide plates 4.2 are located on both sides of the strip socket 4.1, and there is a gap between the bottom end of the guide plate 4.2 and the bottom plate 5.1. The strip embedded block includes a cylindrical block and a strip connecting seat connecting the cylindrical block and the base plate 3.1; the embedded groove 1.1 includes a groove body with a circular cross-section that matches the cylindrical block and a strip connecting groove connected to the groove body. The cable body includes an outer sheath 1, a first wrapping layer 8, an armor layer 9, a second wrapping layer 10, an oxygen barrier layer 11, a shielding layer 12 and a third wrapping layer 13 from the outside to the inside, and the third wrapping layer has a cable core, and the cable core includes a fire-resistant layer 14, an insulating layer 15 and a conductor 16 from the outside to the inside. The first wrapping layer, the second wrapping layer and the third wrapping layer are all mica tape wrapping layers; the oxygen barrier layer is a low-smoke halogen-free flame retardant layer; the insulating layer is a silicone rubber insulating layer, the fire-resistant layer is a mineral flame retardant layer, and the outer sheath is a polyethylene outer sheath.

[0045] Working principle: Figure 1A As shown, the cable body of the cable of the present application has a fire-resistant layer, an oxygen-isolating layer and a multi-layer winding layer, so that it has good fire-resistant and flame-retardant properties. And when the outer sheath is extruded, a detection groove and two embedded grooves are integrally extruded, so that the embedded groove can be installed in conjunction with the heat dissipation unit, and a placement channel for placing the temperature measuring optical fiber is formed between the detection groove and the strip plug block and the strip socket, so that the temperature at the bottom of the cable can be detected. In actual application, it can be determined whether it is necessary to perform active heat dissipation operations based on the detected temperature. When active heat dissipation is not required, due to the increase in the temperature of the cable body, the hot air around the cable body can flow upward through the strip through hole, thereby taking away the heat around the cable body, thereby having a better natural heat dissipation effect. The end of the plug rod extends into the strip limit groove, so that the position of the installation position and the connection unit is limited, thereby ensuring that the position of the installation position and the connection unit is limited.

[0046] When active heat dissipation is required, the heat dissipation fan is turned on, so that the heat dissipation airflow passes through the heat dissipation fan and enters the space between the bottom plate and the cable body, and due to the obstruction of the two T-shaped slide rails of the connection unit, it is not easy to flow away from the strip through hole, and due to the limitation of the guide plate, when the heat dissipation airflow passes through the guide plate, a part of it will flow to the side through the gap at the bottom of the guide plate, thereby sweeping the surface of the cable body and taking away the heat on the surface of the cable body, and the other part will go along the length direction of the cable body and flow away from the gap of the guide plate at the upstream (or downstream), so that the heat dissipation airflow generated at an airflow generating unit can achieve heat dissipation for the cable body on a longer length. According to the actual installation and use conditions of the cable, the number of airflow generating units installed can be selected. In places with high heat dissipation requirements, more airflow generating units can be installed, and in places with low heat dissipation requirements, fewer airflow generating units can be installed. And the two heat dissipation fans at the airflow generating unit can be set to be independently controlled, so that according to the detected temperature, both heat dissipation fans at the airflow generating unit can be turned on, or only one heat dissipation fan can be turned on.

[0047] Although the present invention has been illustrated and described with respect to the preferred embodiments, it will be appreciated by those skilled in the art that various changes and modifications may be made to the present invention without departing from the scope of the present invention as defined by the claims.

Claims

1. A flame retardant B1 grade fire resistant control cable for rail transit, characterized in that: The invention comprises a cable body and a heat dissipation unit, wherein the cable body comprises an outer sheath, and the outer sheath has two embedding grooves and a detection groove located between the two embedding grooves; the heat dissipation unit comprises a threading rope, a plurality of connection units, a plurality of flow guide units, a plurality of airflow generating units, and a mounting plate unit extending along the length direction of the cable body, wherein the connection units and the flow guide units are both passed through by the threading rope, and the plurality of connection units and the plurality of flow guide units are alternately distributed; the connection unit is used to connect the cable body and the mounting plate unit, and the airflow generating unit is installed at the mounting plate unit; The connecting unit comprises a base plate, two strip embedded blocks connected to the base plate, a strip plug-in block connected to the base plate and located between the two strip embedded blocks, and two T-shaped plug-in rails connected to the base plate, the two strip embedded blocks are respectively embedded in two embedded grooves, the strip plug-in block is inserted into the detection groove, and the strip plug-in block has a first rope threading channel through which the rope is threaded; the flow guide unit comprises a strip socket inserted into the detection groove and two flow guide plates connected to the strip sockets, the strip socket has a second rope threading channel through which the rope is threaded; the mounting plate unit comprises a bottom plate with an arc-shaped cross-section and two strip convex blocks connected to the bottom plate and extending along the length direction of the bottom plate, the strip convex blocks having a T-shaped slot matched with the T-shaped plug-in rail; a temperature measuring optical fiber extending along the length direction of the cable body is installed between the detection groove and the strip plug-in block; The bottom plate is provided with two rows of strip through holes, and two strip protrusions are located between the two rows of strip through holes. The bottom plate is provided with multiple mounting positions, and the airflow generating unit is installed at the mounting position, and the mounting position has two first mounting through holes and a first plug hole, and the airflow generating unit comprises an upper mounting part, a lower mounting part and two tightening parts, and the upper mounting part comprises an arc panel and two upper cylinder parts, and the arc panel has a second plug hole and two connecting holes connected with the upper cylinder part, and the upper cylinder part has an external thread, and the lower mounting part comprises a fixing plate, a plug rod capable of being inserted into the first plug hole and the second plug hole, and two second mounting through holes, and the tightening part comprises a lower cylinder part and a cooling fan installed in the lower cylinder part, and the lower cylinder part has an internal thread, and the upper cylinder part passes through the first mounting through hole and the second mounting through hole and is screwed and fixed to the lower cylinder part; the lower surface of the substrate has a strip limiting groove into which the end of the plug rod is inserted.

2. The flame-retardant B1-class fire-resistant control cable for rail transit according to claim 1, characterized in that: The length of the connecting unit is equal to the length of the guide unit; the number of the two rows of strip-shaped through holes is equal and one-to-one corresponding, and there is one connecting unit between two corresponding strip-shaped through holes.

3. The flame-retardant B1-class fire-resistant control cable for rail transit according to claim 1, characterized in that: The upper surface of the fixing plate is an arc surface, and the lower surface is a plane; both sides of the fixing plate are provided with strip-shaped placement grooves.

4. The flame-retardant B1-class fire-resistant control cable for rail transit according to claim 2, characterized in that: The number of the installation positions is equal to the number of the strip through holes in a row of strip through holes, and each installation position is located between two corresponding strip through holes; at least one installation position between any two adjacent installation positions is installed with the airflow generating unit.

5. The flame-retardant B1-class fire-resistant control cable for rail transit according to claim 1, characterized in that: The top of the strip plug is in the shape of an arc groove; the width of the strip plug, the width of the strip socket and the width of the detection groove are equal; the guide plate is in the shape of an arc, two guide plates are located on both sides of the strip socket, and there is a gap between the bottom end of the guide plate and the bottom plate.

6. The flame-retardant B1-class fire-resistant control cable for rail transit according to claim 1, characterized in that: The strip-shaped embedded block includes a cylindrical block and a strip-shaped connecting seat connecting the cylindrical block and the base plate; the embedded groove includes a groove body with a circular cross section matching the cylindrical block and a strip-shaped connecting groove connected to the groove body.

7. The flame-retardant B1-class fire-resistant control cable for rail transit according to claim 1, characterized in that: The cable body comprises an outer sheath, a first wrapping layer, an armor layer, a second wrapping layer, an oxygen-isolating layer, a shielding layer and a third wrapping layer from the outside to the inside, wherein the third wrapping layer has a cable core, and the cable core comprises a fire-resistant layer, an insulating layer and a conductor from the outside to the inside.

8. The flame-retardant B1-class fire-resistant control cable for rail transit according to claim 7, characterized in that: The first wrapping layer, the second wrapping layer and the third wrapping layer are all mica tape wrapping layers; the oxygen isolation layer is a low-smoke halogen-free flame retardant layer; the insulating layer is a silicone rubber insulating layer, the fire-resistant layer is a mineral flame retardant layer, and the outer sheath is a polyethylene outer sheath.

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