Graphene electric heat tracing pipe shell wrapping pipeline

Abstract

The utility model provides a graphene electric heat tracing pipe shell wrapping a pipeline, which belongs to the technical field of pipeline protection and comprises a graphene electrothermal film wrapping the outer wall of the pipeline, the graphene electrothermal film is wound outside an unwinding roller, a waterproof reflecting layer is attached to the outer side of a heat preservation layer, a graphene heating film is attached to the inner side of the heat preservation layer, and the graphene heating film is wound outside the unwinding roller. Each section of the graphene electrothermal film is connected through a cable and a waterproof aviation cable connector, the terminal is communicated with an external temperature control device, a cut-off opening is formed between every two adjacent graphene electrothermal films, the graphene electrothermal films are installed in a sectional mode during wrapping, each section is connected in a parallel mode, and the terminal is connected with the terminal. Wherein heating of other pipe sections is not affected when one section breaks down, installation and maintenance are convenient, an operation indicating lamp is installed on the outer side of each waterproof layer, and when the indicating lamps are turned off, single-section heating breaks down, single-section replacement can be achieved, and electric heat tracing and heat preservation of the whole pipeline do not need to be replaced.

Description

Technical Field

[0001] This utility model relates to the field of pipeline protection technology, specifically a graphene electric heat tracing pipe shell that covers the outside of a pipeline. Background Technology

[0002] After the pipeline is laid, it needs to be covered with a protective film to ensure the protection of the pipeline. Among them, graphene electrothermal film is the most widely used.

[0003] The graphene electric heat tracing system on the pipeline consists of a graphene electric heat tracing tube shell and an intelligent temperature controller. Graphene is known worldwide as "black gold" and the "king of new materials," being the thinnest, strongest, and most electrically and thermally conductive nanomaterial known to date.

[0004] Graphene, a two-dimensional carbon material, is a honeycomb-shaped planar film formed by sp2 hybridization of carbon atoms. It is a quasi-two-dimensional material with a thickness of only one atomic layer, hence it is also called single-atom-layer graphite. Its thickness is approximately 0.335 nm, and varies in different ways depending on the preparation method. Typically, its height in the vertical direction is about 1 nm, and its width in the horizontal direction is about 10 nm to 25 nm.

[0005] Graphene has many excellent properties, such as high mechanical strength (Young's modulus up to 1 TPa), good electrical conductivity (resistivity of only 10-6 Ω·cm), good thermal conductivity (thermal conductivity up to 5300 W / mK), high saturation current density (can withstand current intensity of 100-200 million A / cm2) and large specific surface area (theoretically up to 2630 m2 / g).

[0006] GR electric heat tracing system provides heat tracing or heating for pipelines or other processes that require antifreeze and insulation, replenishing the heat lost by the fluid and maintaining the temperature within the required range to meet various temperature requirements.

[0007] A related technology (publication number: CN221409152U) discloses an electric heating cable. The disclosed technical solution is as follows: the electric heating cable has multiple positive temperature coefficient thermistors arranged at intervals along the extension direction of the heating core connected in parallel between a first conductive dielectric layer and a second conductive dielectric layer arranged in parallel with each other. Since the positive temperature coefficient thermistors heat up quickly after being energized, the heating core can be guaranteed to have a high heating effect. At the same time, since each positive temperature coefficient thermistor is connected in parallel with the first and second conductive dielectric layers, even if a single positive temperature coefficient thermistor has a fault such as an open circuit, it will not affect the normal operation of the other positive temperature coefficient thermistors. Therefore, it can avoid the problem of local burnout caused by long-term high-temperature use of the cable, which damages the entire electric heating cable, as in the related technology, thereby improving the service life of the electric heating cable.

[0008] The above-disclosed technical solutions reveal the following problems: Currently, the insulating sheath used for the external covering of pipeline heating cables is prone to aging, which can easily lead to electric shock. The heating method uses resistance heating, which makes the metal wires prone to breakage. The temperature at the break point rises abnormally, potentially causing a fire. Furthermore, the linear metal heating element of the heating cable cannot be tightly adhered to the pipeline being heated during winding, resulting in significant heat loss. To address these issues, we propose a novel graphene electric heating cable shell that covers the pipeline.

[0009] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background section of this application, and therefore may include prior art information that does not constitute prior art information known to those skilled in the art. Utility Model Content

[0010] This utility model aims to solve at least one of the technical problems existing in the prior art or related technologies. To address the issue of pipeline protection performance of electric heating tapes in the prior art, this utility model provides a graphene electric heating pipe shell covering the pipeline, employing a multi-segment parallel heating structure combined with an outer wall protection structure to improve pipeline protection performance. The specific technical solution is as follows:

[0011] A graphene electric heat tracing pipe shell for covering pipelines includes a graphene electric heating film covering the outer wall of the pipeline. The outer wall of the graphene electric heating film is covered with an insulation layer, and the outer wall of the insulation layer is covered with a waterproof reflective layer. The graphene electric heating film is electrically connected to an external temperature controller via a waterproof aviation cable connector. The waterproof aviation cable connector passes through the insulation layer and the waterproof reflective layer in sequence and extends to the outside. The waterproof aviation cable connector located outside each section of the pipeline is connected to the external temperature controller in parallel.

[0012] In the above technical solution, a temperature sensor is provided on the inner side of the graphene electrothermal film, and the temperature sensor is electrically connected to an external temperature controller through a waterproof aviation cable connector.

[0013] Pre-installed bases are arranged sequentially and evenly on the outer edge of the graphene electrothermal film. A locking block is fixed to the outer wall of the pre-installed base. Pre-installed locking seats are arranged sequentially on the inner edge of the graphene electrothermal film, and the pre-installed locking seats are located on the side away from the pre-installed base. A cavity is opened on the side wall of the pre-installed locking seat. A serrated locking groove is opened sequentially on both sides of the inner wall of the cavity to interlock with the locking block.

[0014] The sides of the card block are wedge-shaped.

[0015] The graphene electrothermal film has anti-slip contacts evenly distributed on its inner side.

[0016] The surface of the graphene electrothermal film is a PI thin film.

[0017] Each segment of the graphene electrothermal film is connected by a cable and a waterproof aviation cable connector, and the power-carrying wires of each segment of the waterproof aviation cable connector are connected by a plug-type connector.

[0018] Each section of the waterproof reflective layer is covered with a metal shell, and the metal shell is equipped with an installation and operation indicator light.

[0019] The graphene electrothermal films are wound sequentially around the outside of the unwinding roller, and a cut-off point is provided between each two adjacent graphene electrothermal films.

[0020] The graphene electrothermal film has a planar heating structure.

[0021] Compared with the prior art, the beneficial effects of this utility model are: the graphene electric heat tracing tube shell covering the pipeline:

[0022] 1. The outer layer of the graphene electric heating film uses a special PI film, and the graphene electrothermal conversion rate reaches over 99.5%. The special heating film can withstand high temperatures of 400 degrees Celsius. Due to the rapid heating of graphene, the active time of the GR electric heating system is short, and the film aging is extremely slow.

[0023] Second, the graphene electric heating film is a surface heating element. It is applied to the pipeline and fixed by the insulation layer to ensure that it is firmly attached to the pipeline without gaps. The insulation layer uses waterproof and flame-retardant materials, so it will not cause electric shock or fire.

[0024] 3. The graphene electric heating film is installed in sections, with each section connected in parallel. If one section fails, it will not affect the heating of other sections. The power wires of each section are connected with plug-type waterproof aviation cable connectors, which makes installation and maintenance convenient. Each section has an operation indicator light installed on the outside of the waterproof metal shell. When the indicator light goes out, it means that the heating of a single section has failed, and the single section can be replaced without replacing the electric heat tracing and insulation of the entire pipeline.

[0025] IV. The graphene electric heating film uses PI film, which is used in high-speed rail and aviation. The PI film has a waterproof rating of IPX7 and can be heated in water. Each section is connected by a plug-type waterproof aviation cable connector with a waterproof rating of IP68. In addition, the graphene electric heating film can also be used to make heated floors for indoor heating, which can replace the existing heating methods such as resistance wire and steam in oilfield and mining stations, achieving energy-saving, safe and environmentally friendly effects. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of a graphene electric heat tracing pipe shell covering the outside of a pipeline according to the present invention.

[0027] Figure 2 This is a schematic diagram of the structure of a single, independent graphene electrothermal film of this utility model;

[0028] Figure 3 This is a cross-sectional view of the structure of a graphene electric heat tracing tube shell covering the pipeline according to the present invention.

[0029] Figure 4 for Figure 1 A magnified view of part A;

[0030] Figure 5 for Figure 2 A magnified view of section B;

[0031] in, Figures 1 to 5 The correspondence between the reference numerals and component names in the attached drawings is as follows: 1-Graphene electric heating film, 2-Unwinding roller, 3-Waterproof aviation cable connector, 4-Temperature sensor, 5-Cut-off opening, 6-Pre-installed base, 7-Card block, 8-Pre-installed card holder, 9-Cavity, 10-Insulation layer, 11-Waterproof reflective layer, 3-Anti-slip contact, 14-Serrated slot, 15-Indicator light. Detailed Implementation

[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0033] The following are specific implementation cases and appendices. Figure 1-5 The present invention will be further described below, but the present invention is not limited to these embodiments.

[0034] A graphene electric heating pipe shell is used to cover a pipeline. A graphene electric heating film 1 is wound around the outside of an unwinding roller 2. Each segment of the graphene electric heating film 1 sequentially covers the outer wall of the pipeline. An insulation layer 10 is wrapped around the outer wall of the graphene electric heating film 1, and a waterproof reflective layer 11 is wrapped around the outer wall of the insulation layer 10. The graphene electric heating film 1 is electrically connected to an external temperature controller via a waterproof aviation cable connector 3. The waterproof aviation cable connector 3 passes through the insulation layer 10 and the waterproof reflective layer 11 sequentially and extends to the outside. Each waterproof aviation cable connector 3 located outside the pipeline segment is connected to the external temperature controller in parallel. The temperature controller has a box-type structure and is fixed to one side near the pipeline. The temperature of the graphene electric heating film 1 is controlled by the temperature controller.

[0035] The graphene electrothermal film 1 has DC or AC power supplies connected to its two electrodes. Under the influence of an electric field, the carbon and metal molecules and electrons in the heating element of the graphene electrothermal film 1 collide with atoms in the resistive body to generate heat. The heat energy is then radiated uniformly in a planar manner in the form of far-infrared rays (wavelengths of 3-15 micrometers), resulting in a total electro-thermal energy conversion rate of over 99% for the graphene electrothermal film 1. This ensures stable and long-lasting heating performance of the graphene electrothermal film.

[0036] Graphene electrothermal film 1 boasts advantages such as higher electrothermal conversion efficiency, faster thermal response, better stability, and longer lifespan. As a planar heating element, it can effectively contact the heating medium, has a large heat exchange area, and can efficiently exchange energy at a faster rate. It can generate far-infrared rays of a constant wavelength. Comparative experiments have shown that, under the same conditions, to achieve the same heating effect, planar heating elements with a constant far-infrared wavelength are 35-40% more energy-efficient than linear heating elements, and heating time can be reduced by 35-40%.

[0037] The waterproof aviation cable connector 3 passes through the insulation layer 10 and the waterproof reflective layer 11 in sequence and extends to the outside. The waterproof aviation cable connector 3 located outside each section of pipeline is connected to the external thermostat in parallel. A cut-off opening 5 is provided between two adjacent graphene electric heating films 1.

[0038] The waterproof reflective layer 11 uses the same quality insulation material as high-speed rail as a carrier, resulting in a low surface temperature, aging resistance, and an overall lifespan of over ten years. The graphene electrothermal film 1 uses a specially formulated PI film with a graphene electrothermal conversion rate exceeding 99.5%. This specially formulated heating film can withstand temperatures up to 400 degrees Celsius. Due to the rapid heating of graphene, the active time of the GR electric heating system is short, and the film ages extremely slowly. The PI film used in high-speed rail and aviation has a waterproof rating of IPX7 and can be heated underwater. Each section is connected using a plug-type waterproof aviation cable connector, achieving a waterproof rating of IP68.

[0039] The graphene heating film 1 has a temperature sensor 4 installed on its inner side. The temperature sensor 4 is electrically connected to an external temperature controller via a waterproof aviation cable connector 3. The temperature sensor 4 transmits the temperature signal from the graphene heating film 1 to the temperature controller, which then adjusts the output voltage of the waterproof aviation cable connector 3 via a power amplifier, thereby regulating the temperature of the graphene heating film 1. This allows for automatic temperature control of the graphene heating film 1, with controllable upper and lower temperature limits, and convenient and simple operation. The maximum heating temperature can reach 120 degrees Celsius.

[0040] It is worth noting that pre-installed bases 6 are arranged evenly on the outer edge of the graphene electrothermal film 1, and a locking block 7 is fixed to the outer wall of the pre-installed base 6. Pre-installed locking seats 8 are arranged on the inner edge of the graphene electrothermal film 1, and the pre-installed locking seats 8 are located on the side away from the pre-installed base 6. A cavity 9 is opened on the side wall of the pre-installed locking seat 8, and a serrated groove 14 that is interference-engaged with the locking block 7 is opened on both sides of the inner wall of the cavity 9.

[0041] Pre-installed bases 6 are sequentially fixed to the outer side of the graphene heating film 1 along its edge, and pre-installed clips 8 are sequentially fixed to the inner edge of the graphene heating film 1. After the graphene heating film 1 is wrapped around the pipeline, a suitable serrated groove 14 is selected according to the diameter of the pipeline using clips 7 for locking. Multiple serrated grooves 14 ensure the fit between the graphene heating film 1 and the outer wall of the pipeline, avoid gaps between the inner side of the graphene heating film 1 and the pipeline, ensure the stability of the pre-installed locking position, and thus ensure the protection of the pipeline.

[0042] Then, the insulation layer 10 is wrapped around the outer wall of the graphene electric heating film 1, followed by the waterproof reflective layer 11, which is then wrapped around the outer wall of the insulation layer 10. Finally, the metal shell is wrapped around the outside of the waterproof reflective layer 11 and fixed to the outermost side of the pipeline with bolts.

[0043] In addition, the sides of the locking block 7 are wedge-shaped. The wedge shape on both sides allows the locking block 7 to fit into the serrated groove 14, forming an interference fit, which makes the pre-installation locking more secure and prevents the graphene heating film from falling off.

[0044] In addition, anti-slip contacts 13 are evenly arranged on the inner side of the graphene heating film 1. The protective contacts 13 are made of rubber, which increases the stability of the graphene heating film 1 covering the pipeline and prevents the graphene heating film 1 from falling off.

[0045] Furthermore, the surface of the graphene electrothermal film 1 is a PI film. A specially formulated PI film is used, along with a core heating paste of conductive curable thickness. The PI film is a polyimide film, the world's best-performing thin-film insulating material. It is formed by polycondensation and casting of pyromellitic dianhydride (PMDA) and diaminodiphenyl ether (ODA) in a highly polar solvent, followed by imidization. It possesses excellent high and low temperature resistance, electrical insulation, adhesion, radiation resistance, and dielectric resistance, and can be used long-term within a temperature range of -269℃ to 280℃, with short-term high temperatures reaching 400℃.

[0046] Each section of the waterproof aviation cable connector 3 uses a plug-type connector for its power-carrying wires, making installation and maintenance more convenient.

[0047] Each section of the waterproof reflective layer 11 is covered with a metal shell, and each metal shell is equipped with an indicator light 15 for detecting the operating status. The indicator light 15 is electrically connected to the graphene electric heating film 1. When the indicator light 15 is off, it means that there is a fault in the heating of a single section, and the single section can be replaced without replacing the electric heat tracing and insulation of the entire pipeline.

[0048] Each section of the metal casing covering the outermost part of the pipeline is secured with bolts, making each section of the casing easy to install and remove.

[0049] The graphene heating film 1 is a planar heating element. It is applied to the pipeline, and the insulation layer 10 further covers and fixes it, ensuring that it adheres firmly to the pipeline without gaps. The insulation layer 10 uses flame-retardant materials, so it will not cause electric shock or fire.

[0050] In the description of this utility model, it should be understood that the terms "coaxial", "bottom", "one end", "top", "middle", "other end", "upper", "side", "top", "inner", "front", "center", "both ends", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model 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 utility model.

[0051] Furthermore, the terms "first," "second," "third," and "fourth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first," "second," "third," or "fourth" may explicitly or implicitly include at least one of those features.

[0052] In this utility model, unless otherwise explicitly specified and limited, the terms "installation", "setting", "connection", "fixing", "screw connection", 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 connection of two components or the interaction between two components. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0053] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A graphene electric heat tracing pipe shell coated on the outside of a pipeline, characterized in that: The graphene electric heating film (1) is coated on the outer wall of the pipeline, the outer wall of the graphene electric heating film (1) is coated with a heat preservation layer (10), the outer wall of the heat preservation layer (10) is coated with a waterproof reflective layer (11), the graphene electric heating film (1) is electrically connected with an external temperature controller through a waterproof aviation cable joint (3), the waterproof aviation cable joint (3) sequentially passes through the heat preservation layer (10) and the waterproof reflective layer (11) and extends to the outside, and the waterproof aviation cable joint (3) located outside each pipeline is connected in parallel with the external temperature controller.

2. The graphene electric tracing pipe shell coated outside the pipeline according to claim 1, characterized in that: The inner side of the graphene electric heating film (1) is provided with a temperature sensor (4), and the temperature sensor (4) is electrically connected with the external temperature controller through the waterproof aviation cable joint (3).

3. The graphene electric heat tracing pipe shell coated outside the pipeline according to claim 1, characterized in that: The outer side edge of the graphene electric heating film (1) is sequentially and uniformly provided with a pre-installed base (6), the outer wall of the pre-installed base (6) is fixedly connected with a clamping block (7), the inner side edge of the graphene electric heating film (1) is sequentially provided with a pre-installed clamping seat (8), and the pre-installed clamping seat (8) is located away from the pre-installed base (6), the side wall of the pre-installed clamping seat (8) is provided with a recess (9), and the inner wall of the recess (9) is sequentially provided with a sawtooth clamping groove (14) in clamping interference with the clamping block (7).

4. The graphene electric heat tracing pipe shell coated outside the pipeline according to claim 3, characterized in that: The side edge of the clamping block (7) is wedge-shaped.

5. The graphene electric heat tracing pipe of claim 1, wherein: The inner side of the graphene electric heating film (1) is uniformly provided with an anti-skid contact (13).

6. The graphene electric heat tracing pipe of claim 1, wherein: The surface of the graphene electric heating film (1) is a PI film.

7. The graphene electric heat tracing pipe of claim 1, wherein: Each graphene electric heating film (1) is linked by a cable and a waterproof aviation cable connector, and the power supply wire of each waterproof aviation cable joint (3) is linked by a plug connector.

8. The graphene electric heat tracing pipe of claim 1, wherein: The outer wall of each waterproof reflective layer (11) is coated with a metal shell, and the metal shell is provided with an indicator light (15).

9. The graphene electric heat tracing pipe of claim 1, wherein: The graphene electric heating films (1) are sequentially and continuously wound outside a winding and unwinding roller (2), and a cutting opening (5) is arranged between adjacent two graphene electric heating films (1).

10. The graphene electric heat tracing pipe of claim 1, wherein: The graphene electric heating film (1) is a planar heating type.

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