Composite material carbon fiber heat tracing band

Abstract

The present application relates to the technical field of carbon fiber heat tracing band, and discloses a composite carbon fiber heat tracing band, which comprises a heating resistor body, the heating resistor body comprises two parallel and spaced busbars, the busbar body of the two busbars is covered with a first insulating layer with a notch, the periphery of the two busbars is covered with a polyolefin conductive combined layer in a flat strip structure, one side of the polyolefin conductive combined layer is provided with a recess axially penetrating and corresponding to the position between the two busbars, and the polyolefin conductive combined layer is connected with the busbar; the recess cavity is matched with a carbon fiber heating body; the periphery of the heating resistor body and the carbon fiber heating body is woven with a metal shielding layer, the outer side of the metal shielding layer is covered with a protective layer, and the outer side of the protective layer is covered with a heat preservation layer. Since the busbars in the carbon fiber heat tracing band and the conductive wires covered with the carbon fiber layer do not need to be partially stripped, the carbon fiber heat tracing band is easier to manufacture.

Description

Technical Field

[0001] This invention relates to the field of carbon fiber heat tracing technology, and in particular to a composite carbon fiber heat tracing material. Background Technology

[0002] Electric heat tracing equipment converts electrical energy into heat energy. Through direct or indirect heat exchange, it replenishes the heat lost by the heat-traced equipment through the insulation material. Temperature control is used to track and control the temperature of the medium inside the heat-tracing equipment, keeping it at a reasonable and economical level.

[0003] Existing carbon fiber heat tracing cables, such as the method for preparing a carbon fiber heat tracing cable disclosed in Chinese Patent Publication No. CN105636255A, and the carbon fiber heat tracing cable prepared by this method, require many alternating copper strips spaced along the axial direction of the carbon fiber. The copper strips are connected to copper wires on the corresponding sides, and the connection between the copper wires and the copper strips requires local peeling treatment, making the manufacturing of this carbon fiber heat tracing cable difficult. Another example is a parallel carbon fiber electric heat tracing cable disclosed in Chinese Patent Publication No. CN107197554A. This parallel electric heat tracing cable includes two parallel busbars with insulation layers. The two busbars are covered with a fluoroplastic composite layer, and carbon fiber is surrounded by the fluoroplastic composite layer. A notch is provided on one side of the composite busbar every 0.8-2.5m. The fluoroplastic insulation layer and the fluoroplastic composite layer at the notch are peeled off, and the part of the carbon fiber in contact with the busbar at the notch is sprayed with high-temperature resistant conductive paint. The manufacturing of this parallel electric heat tracing cable also requires many local peeling treatments, making the manufacturing of this parallel electric heat tracing cable difficult.

[0004] Therefore, we provide a composite carbon fiber heat tracing cable. Summary of the Invention

[0005] The purpose of this invention is to provide a composite carbon fiber heat tracing cable to solve the above-mentioned problems.

[0006] The present invention achieves the above objectives through the following technical solutions: A composite carbon fiber heating tape includes a heating resistor, which comprises two parallel and spaced busbars. Each busbar is covered with a first insulating layer with notches. The two busbars are surrounded by a flat, strip-shaped polyolefin conductive composite layer. One side of the polyolefin conductive composite layer has an axially penetrating groove located between the two busbars, and the polyolefin conductive composite layer is correspondingly connected to the busbars. A carbon fiber heating element is fitted into the groove cavity. A metal shielding layer is woven around the heating resistor and the carbon fiber heating element. A protective layer is covered outside the metal shielding layer, and a heat insulation layer is covered outside the protective layer. It also includes a wiring clip fixed to the end of the insulation layer, and the ends of the carbon fiber heating element and its two busbars in the same direction are connected accordingly through the wiring clip.

[0007] Preferably, the carbon fiber heating element includes a wire with a rectangular cross-section, the wire body is uniformly covered with a carbon fiber layer, the outer side of the carbon fiber layer is uniformly covered with a second insulating layer, and the second insulating layer has a notch at the position corresponding to the groove wall, so as to facilitate the contact between the carbon fiber layer and the polyolefin conductive composite layer. The ends of the conductors are connected to the ends of the busbars in the same direction via connectors.

[0008] Preferably, the protective layer is made of woven glass fiber.

[0009] Preferably, the second insulating layer is made of tetrafluoroethylene material.

[0010] Preferably, the method for preparing the heating resistor includes the following steps: Step 1: Prepare two busbars and use a wrapping machine to wrap each busbar with the first insulation layer. Step 2: Place the two busbars covered with the first insulation layer in parallel with a gap between them; Step 3: Use a coating machine to coat the conductive polyolefin around the two parallel and spaced busbars to form a grooved conductive polyolefin composite layer.

[0011] Preferably, the method for preparing the carbon fiber heating element includes the following steps: Step 1: Prepare a wire and wrap carbon fiber in a cross loop around the wire body so that the cross looped carbon fiber forms a carbon fiber layer of uniform thickness. Step 2: Using a coating machine, polytetrafluoroethylene (PTFE) is coated onto the outside of the carbon fiber layer to form a second insulating layer that matches the groove.

[0012] Preferably, the wiring clip includes a fixing part that can be sleeved and engaged with the periphery of the end of the insulation layer. The fixing part is coaxially fixed to the wiring part. Both ends of the wiring part are provided with a first wiring structure that allows the busbar to be inserted and presses the busbar body. The middle of the wiring part is provided with a second wiring structure that allows the conductor to be inserted and presses the conductor body. The wiring part is also provided with a third wiring structure that extends outward.

[0013] Preferably, the second wiring structure and the two first wiring structures are arranged in a triangular pattern.

[0014] Preferably, the wiring structure includes a fixing part with a plug hole in the middle, and a wire clamping stud is screwed radially to one side of the fixing part, and a pressure plate is rotatably connected to the inner end of the wire clamping stud. In this configuration, the fixing part of the two first wiring structures is biased towards the same side of the second wiring structure and is provided with a wire clamping stud, and the second wiring structure is provided with a wire clamping stud on the side corresponding to the middle part between the two first wiring structures.

[0015] The beneficial effects are: 1. Since the internal busbar and the conductor covered with carbon fiber layer of this carbon fiber heat tracing cable do not require local stripping, the manufacturing of this carbon fiber heat tracing cable is much easier.

[0016] 2. Since the carbon fiber heating element is located in the groove in the middle of one side of the polyolefin conductive composite layer, and carbon fiber has good electrical conductivity and high thermal conductivity, it can achieve a uniform heating effect. Combined with the positional relationship between the polyolefin conductive composite layer and the carbon fiber heating element, heat is transferred to the outer surface of the carbon fiber heating tape, thereby achieving a uniform and rapid heating effect on the heated equipment.

[0017] The additional technical features and advantages of the present invention will become more apparent from the following description, or may be learned through practice of the invention. Attached Figure Description

[0018] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the following detailed description to explain the invention, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a cross-sectional schematic diagram of the present invention; Figure 3 This is a schematic diagram of the wiring clip in this invention; Figure 4 This is a structural schematic diagram of the wiring clip in this invention from another perspective.

[0019] The annotations in the attached figures are explained as follows: 1. Heating resistor; 11. Busbar; 12. First insulation layer; 13. Polyolefin conductive composite layer; 14. Groove; 2. Carbon fiber heating element; 21. Conductor; 22. Carbon fiber layer; 23. Second insulation layer; 3. Metal shielding layer; 4. Protective layer; 5. Thermal insulation layer; 6. Wiring clip; 61. Fixing part; 62. Wiring part; 621. First wiring structure; 622. Second wiring structure; 623. Third wiring structure. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0022] In the description of this invention, it should be understood that the terms indicating orientation or positional relationship are based on the orientation or positional relationship shown in the drawings and are only for the convenience of describing the invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention.

[0023] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0024] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention. In addition, the terms "first," "second," "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0025] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0026] In this invention, unless otherwise expressly specified and limited, "above or below" a first feature may include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on" the first feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the first feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0027] like Figure 1-2 As shown, a composite carbon fiber heat tracing cable includes a heating resistor 1 and a carbon fiber heating element 2. The heating resistor 1 includes two parallel and spaced busbars 11. The body of each busbar 11 is covered with a first insulating layer 12 with a notch. The two busbars 11 are surrounded by a polyolefin conductive composite layer 13 with a flat strip structure. One side of the polyolefin conductive composite layer 13 is provided with an axially penetrating groove 14 located in the middle of the two busbars 11. The polyolefin conductive composite layer 13 is connected to the busbars 11.

[0028] Furthermore, the method for preparing the heating resistor 1 includes the following steps: Step 1: Prepare two busbars 11, and use a wrapping machine to wrap each busbar 11 with the first insulation layer 12. Specifically, the insulating material is wound into the busbar 11 in a spiral manner using a wrapping machine to form a first insulating layer 12 with gaps; Step 2: Place the two busbars 11 covered with the first insulation layer 12 in parallel at intervals; Step 3: Using a coating machine, conductive polyolefin is coated around two parallel and spaced busbars 11 to form a conductive polyolefin composite layer 13 with grooves 14.

[0029] As required, each busbar 11 is spirally covered with a first insulation layer 12. That is, the first insulation layer 12 is spirally wound around the corresponding busbar 11. In other words, the notch of the first insulation layer 12 is a spiral.

[0030] like Figure 1-2As shown, the groove 14 is fitted with a carbon fiber heating element 2; a metal shielding layer 3 is woven around the heating resistor 1 and the carbon fiber heating element 2, and a protective layer 4 made of woven glass fiber is wrapped around the outside of the metal shielding layer 3, and a heat insulation layer 5 is wrapped around the outside of the protective layer 4.

[0031] like Figure 1 As shown, it also includes a wiring clip 6 fixed to the end of the insulation layer 5, and the ends of the carbon fiber heating element 2 and its two busbars 11 in the same direction are connected to each other through the wiring clip 6.

[0032] The heating principle of this carbon fiber heat tracing cable is as follows: the polyolefin conductive composite layer 13 causes the micro-molecules to shrink, which connects the carbon particles to form a circuit. The current flows through the polyolefin conductive composite layer 13, giving the carbon fiber heat tracing cable a self-regulating temperature characteristic. Specifically, when the temperature rises, the polyolefin conductive composite layer 13 causes molecular expansion, the carbon particles gradually separate, causing the circuit to be interrupted and the resistance to rise. The carbon fiber heat tracing cable automatically reduces the power output. When the ambient temperature cools down, the polyolefin conductive composite layer 13 returns to the micro-molecular contraction state, and the carbon particles connect accordingly to form a circuit, and the heating power of the heat tracing cable automatically increases.

[0033] In practical use, it can be wrapped or laid flat on the outside of pipes or tanks in various ways, and then covered with insulation material. One end of the carbon fiber heat tracing cable is connected to a temperature controller to accurately control its antifreeze operation. When the temperature sensor detects that the pipe temperature is lower than the set temperature, the temperature controller turns on the power and the carbon fiber heat tracing cable starts to run. When the temperature sensor detects that the pipe temperature is higher than the set temperature, the temperature controller turns off the power, so that the carbon fiber heat tracing cable operates in the most economical and reasonable state and meets the requirements of media antifreeze and anti-clogging, realizing intelligent monitoring function.

[0034] In this embodiment, as Figure 1-2 As shown, the carbon fiber heating element 2 includes a rectangular wire 21. The wire 21 is uniformly covered with a carbon fiber layer 22. The outer side of the carbon fiber layer 22 is uniformly covered with a second insulating layer 23 made of tetrafluoroethylene material. The second insulating layer 23 has a notch at the position corresponding to the groove wall of the groove 14 so that the carbon fiber layer 22 can contact the polyolefin conductive composite layer 13.

[0035] This arrangement allows the conductor 21 to make corresponding contact with the busbar 11 through the carbon fiber layer 22 and the polyolefin conductive composite layer 13.

[0036] Furthermore, the end of the conductor 21 is connected to the end of the busbar 11 in the same direction via a connector 6.

[0037] Furthermore, the preparation method of the carbon fiber heating element 2 includes the following steps: Step 1: Prepare a wire 21, and wrap carbon fiber in a cross loop around the wire 21 so that the cross looped carbon fiber forms a carbon fiber layer 22 of uniform thickness. Step 2: Using a coating machine, polytetrafluoroethylene is coated onto the outside of the carbon fiber layer 22 to form a second insulating layer 23 that matches the groove 14; It should be noted that, since the second insulating layer 23 has a gap, when the carbon fiber heating element 2 is placed into the groove 14, it is necessary to ensure that the polyolefin conductive composite layer 13 is in an unsolidified state. That is, when the carbon fiber heating element 2 is installed, the polyolefin conductive composite layer 13 is squeezed and deformed to fill the gap in the second insulating layer 23, so that the polyolefin conductive composite layer 13 contacts the carbon fiber layer 22.

[0038] In some embodiments, such as Figure 3-4 As shown, the wiring clip 6 includes a fixing part 61 that can be sleeved and engaged with the periphery of the end of the insulation layer 5. The fixing part 61 is coaxially fixed to the wiring part 62. Both ends of the wiring part 62 are provided with a first wiring structure 621 that allows the busbar 11 to be inserted and presses the body of the busbar 11. The middle of the wiring part 62 is provided with a second wiring structure 622 that allows the conductor 21 to be inserted and presses the body of the conductor 21. The wiring part 62 is also provided with a third wiring structure 623 that extends outward.

[0039] Furthermore, the wiring structure includes a fixing part with a plug hole in the middle, and a wire clamping stud is screwed radially to one side of the fixing part, and a pressure plate is rotatably connected to the inner end of the wire clamping stud. In this configuration, the fixing part of the two first wiring structures 621 is provided with a wire clamping stud on the same side as the second wiring structure 622, and the second wiring structure 622 is provided with a wire clamping stud on the side corresponding to the middle part between the two first wiring structures 621.

[0040] As needed, the second wiring structure 622 and the two first wiring structures 621 are arranged in a triangular pattern.

[0041] Specifically, in the second wiring structure 622, the plug hole is coaxially arranged with the wire 21, and in the first wiring structure 621, the plug hole is coaxially arranged with the corresponding busbar 11.

[0042] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A composite carbon fiber heat tracing cable, characterized in that: The device includes a heating resistor (1), which includes two parallel and spaced busbars (11). The body of each busbar (11) is covered with a first insulating layer (12) with a notch. The two busbars (11) are covered with a flat strip-shaped polyolefin conductive composite layer (13). One side of the polyolefin conductive composite layer (13) is provided with an axially penetrating groove (14) located in the middle of the two busbars (11). The polyolefin conductive composite layer (13) is connected to the busbars (11). The groove (14) is fitted with a carbon fiber heating element (2). The heating resistor (1) and the carbon fiber heating element (2) are surrounded by a metal shielding layer (3). The metal shielding layer (3) is covered with a protective layer (4). The protective layer (4) is covered with a heat insulation layer (5). It also includes a wiring clip (6) fixed to the end of the insulation layer (5), and the ends of the carbon fiber heating element (2) and its two busbars (11) in the same direction are connected to each other through the wiring clip (6). The carbon fiber heating element (2) includes a rectangular wire (21), the wire (21) is uniformly covered with a carbon fiber layer (22), the carbon fiber layer (22) is uniformly covered with a second insulating layer (23) on the outside, and the second insulating layer (23) has a notch at the position corresponding to the groove wall of the groove (14) so ​​that the carbon fiber layer (22) can contact the polyolefin conductive composite layer (13). The end of the conductor (21) is connected to the end of the busbar (11) in the same direction via a connector (6).

2. The composite carbon fiber heat tracing cable according to claim 1, characterized in that: The protective layer (4) is made of woven glass fiber.

3. The composite carbon fiber heat tracing cable according to claim 1, characterized in that: The second insulating layer (23) is made of tetrafluoroethylene.

4. The composite carbon fiber heat tracing cable according to claim 1, characterized in that: The method for preparing the heating resistor (1) includes the following steps: Step 1: Prepare two busbars (11) and use a wrapping machine to wrap each busbar (11) with the first insulation layer (12). Step 2: Place the two busbars (11) covered with the first insulation layer (12) in parallel with a gap between them; Step 3: Using a coating machine, the conductive polyolefin is coated around the two parallel and spaced busbars (11) to form a polyolefin conductive composite layer (13) with grooves (14).

5. A composite carbon fiber heat tracing cable according to claim 1 or 3, characterized in that: The preparation method of the carbon fiber heating element (2) includes the following steps: Step 1: Prepare a wire (21), and wrap the carbon fiber in a cross loop around the wire (21) so that the cross looped carbon fiber forms a carbon fiber layer (22) of uniform thickness. Step 2: Using a coating machine, PTFE is coated onto the outside of the carbon fiber layer (22) to form a second insulating layer (23) that matches the groove (14).

6. The composite carbon fiber heat tracing cable according to claim 1, characterized in that: The wiring clip (6) includes a fixing part (61) that can be sleeved and locked onto the periphery of the end of the insulation layer (5). The fixing part (61) is coaxially fixed to the wiring part (62). Both ends of the wiring part (62) are provided with a first wiring structure (621) that allows the busbar (11) to be inserted and presses the body of the busbar (11). The middle part of the wiring part (62) is provided with a second wiring structure (622) that allows the conductor (21) to be inserted and presses the body of the conductor (21). The wiring part (62) is also provided with a third wiring structure (623) that extends outward.

7. The composite carbon fiber heat tracing cable according to claim 6, characterized in that: The second wiring structure (622) and the two first wiring structures (621) are arranged in a triangular pattern.

8. The composite carbon fiber heat tracing cable according to claim 7, characterized in that: The wiring structure includes a fixing part with a plug hole in the middle, and a wire pressing stud is screwed to one side of the fixing part radially, and a pressure plate is rotatably connected to the inner end of the wire pressing stud. Among them, the fixing part of the two first wiring structures (621) is biased towards the same side of the second wiring structure (622) and is provided with a wire pressing stud. The second wiring structure (622) is provided with a wire pressing stud on one side of the middle part between the two first wiring structures (621).

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