Carbon fiber electric heating belt for heat preservation of water pipe

Abstract

When the carbon fiber electric heating tape is used, the carbon fiber electric heating tape is adhered to the water pipe and is provided with an outer skin layer for supporting and protecting from outside to inside, an outer skin rubber layer is coated on the outer skin layer, an inner skin layer is arranged outside the outer skin rubber layer, and an interlayer wiring space layer is arranged on the outer skin rubber layer and below the inner skin layer along the longitudinal middle part of the carbon fiber electric heating tape. The outer skin layer and the inner skin layer on the two sides of the wiring space layer are bonded and sealed through the outer skin rubber layer, and carbon fiber electric heating wires which generate power to enable the electric power of the carbon fiber heating belt per unit length to meet the heat preservation requirement of the water pipe, a zero wire, a live wire, a ground wire and a standby wire are longitudinally laid in the wiring space layer in parallel and are bonded and fixed through the outer skin rubber layer. An inner skin layer used for being adhered to the water pipe is arranged outside the inner skin layer, a release film layer used for isolating the inner skin layer is arranged outside the inner skin layer, and the continuous or fixed-length heat preservation material for the strip-shaped water pipe is formed.

Description

Technical Field

[0001] The invention patent relates to the technical field of electric heating water pipe insulation, and specifically to a carbon fiber electric heating belt for water pipe insulation. Background Art

[0002] In the water-using occasions of home, office, commercial service and industrial use, various electric heating water pipe insulation technologies are applied to water pipe insulation (including antifreeze). Especially in the current field of household hot water application, in order to solve the consumer pain point of cold water flowing continuously before the hot water comes out after turning on the faucet, and to solve the waste of tap water, electricity, gas and increase of carbon emissions caused by draining cold water, a convenient, long-lasting and cheap insulation equipment for hot water pipes is needed, and water pipe insulation has added a new and broad application field. In the prior art, there is a traditional heating tape technology, which is a flat ribbon cable composed of a conductive polymer composite material, two parallel metal wires and an insulating sheath. It is generally used for the purpose of antifreeze of outdoor cold water pipes. Due to its relatively short service life (about 3 years), it cannot be used for long-term insulation of household indoor water pipes. This heating tape is different from the long-term indoor use scenario of this technology, and the principle is also very different. There is also a technology for assembled electric heating insulation water pipes, which is a method of installing a carbon fiber electric heating pipe outside the water pipe to insulate the water pipe. The heating element of this method has a long life. Although it meets the advantages of being used for long-term indoor insulation, it also has shortcomings. The following is a discussion of the problems of the prior art of an assembled carbon fiber electric heating pipe.

[0003] The main problems are:

[0004] Compared with this technology, the electric heating carbon fiber insulated water pipe system of the prior art has complex structure, complex processing, more materials and high cost. There is still a key problem that has not been solved: because the amount of heat required to supplement the insulated water pipe in most cases is relatively small, under the premise of using the conventional single-layer winding electric heating wire, even if the thinnest electric heating wire and the largest winding density on the market are used, the unit length electric power of the short-sized electric heating component cannot be consistent with that of the long-sized electric heating component, resulting in different electric heating temperatures in a water pipe, or even local overheating, affecting safe use. Even if the method of multi-layer winding is used to achieve high resistance, it is not only costly and complex in process, but also causes the problem of unsafe overheating inside the electric heating layer.

[0005] The existing electric heating carbon fiber insulated water pipe system is complex and difficult to install. The carbon fiber electric heating pipe needs to be installed outside the water pipe and must be installed at the same time as the hot water pipe. In the decoration project, the hot water pipe is the responsibility of the decoration party and needs to be cross-constructed at the same time, which brings inconvenience to the construction organization and is prone to construction quality problems without clear responsibilities. The inconvenience makes construction difficult, inefficient, and pushes up construction costs.

[0006] The patent of this invention is a new type of carbon fiber electric heating tape for water pipes, which is suitable for all scenarios where carbon fiber electric heating insulation pipes are used to insulate hot water pipes and prevent freezing of cold water pipes. It is suitable for both insulation and antifreeze purposes; it is suitable for installation during house decoration and for adding water pipe insulation systems after house decoration. The patent of this invention not only has the same function as the carbon fiber electric heating pipe, but also solves the above problems and brings the following advantages:

[0007] First, due to the advantages of the ribbon structure, it does not use a core tube, unlike the carbon fiber electric heating tube that uses multiple turns of winding, but uses a straight line, which uses less material and improves processing efficiency, resulting in lower costs and higher production efficiency. It does not need to be processed inefficiently in sections and strands like the carbon fiber electric heating tube, but can be processed tens of meters or hundreds of meters at a time, which greatly improves efficiency and is suitable for mass production on automatic production lines. In particular, the processing cost is lower than that of multi-layered carbon fiber electric heating tubes.

[0008] Secondly, it can also solve the problem of the existing technology of water pipe installation and carbon fiber electric heating pipe installation being carried out at the same time. The responsibilities of the water pipe installer and the water pipe insulation party are clearly divided, which facilitates independent construction, and the installation is simple with a low failure rate.

[0009] Third, the electric heating belt is continuous without gaps. Compared with the carbon fiber electric heating tube which has gaps during installation, the water pipe is heated more evenly without the problem of being hot and cold in one section.

[0010] Fourth, because carbon fiber mainly uses far-infrared radiation, its heat transfer efficiency is higher than that of other electric heating materials, it has a high heat conversion rate, a long service life, and also has a beneficial effect on health care. Summary of the invention

[0011] The present invention has the following technical solutions:

[0012] In order to achieve the above-mentioned purposes and advantages of the present invention, the carbon fiber electric heating tape for water pipe insulation provided by this patent can be powered by AC and DC, and is a strip-shaped electric heating element containing carbon fiber electric heating wires and wires that can be adhered to the outside of the water pipe: there is a continuous tape that can be made into any length and then cut according to the length of the water pipe used on site; there is also a fixed-length tape, which is several carbon fiber electric heating tapes of shorter lengths, used to handle the insulation of the remaining part of the tail when the continuous electric heating tape is adhered to the water pipe for insulation.

[0013] The carbon fiber electric heating belt has the following basic structure from outside to inside:

[0014] The outer skin layer is arranged at the outermost layer of the carbon fiber electric heating belt, and plays a supporting and protective role for the entire electric heating belt. It is made of glass fiber or chemical fiber cloth, plastic film or a composite material of plastic and glass fiber.

[0015] The outer skin adhesive layer is used to make the inner skin layer, the carbon fiber electric heating wire and the wire in the wiring space layer adhere to the outer skin layer, and is evenly coated on the outer skin layer. The material of the adhesive layer is a single-component pressure-sensitive adhesive, such as a resin-type adhesive or a rubber-type adhesive. The adhesive of the outer skin adhesive layer adheres and fixes the carbon fiber electric heating wire and the neutral wire, live wire, ground wire, and spare wire in the wiring space layer to the outer skin layer in the middle strip of the carbon fiber electric heating belt; and tightly adheres the outer skin layer to the inner skin layer in the side strips on both sides.

[0016] The wiring space layer is used to arrange and fix the carbon fiber electric heating wire and the electric wire (all or part of the neutral wire, live wire, ground wire, and spare wire) in the space sandwich, which is located between the inner and outer skin layers and fixed by the outer skin rubber layer. First, they are arranged longitudinally along the electric heating belt, with the ends of the neutral wire, live wire, and ground wire exposed outside the inner and outer skin layers to receive power, and arranged on the outer skin rubber layer. Carbon fiber electric heating wire, multi-segment type carbon fiber is divided into several segments, each segment is determined according to its resistance characteristics, the unit length electric power required for water pipe insulation, and the voltage used by the carbon fiber segment. The segment is arranged in parallel with the neutral line and the live line on both sides. The two ends of each segment are respectively connected to the neutral line (including the negative line of direct current, the same below) and the live line (including the positive line of direct current, the same below) on both sides to form a circuit to receive power. The segments are arranged in a row facing each other, and they are connected and non-overlapping to form a whole electric heating wire on the electric heating belt; the non-segment type is a wire that is not divided into segments during production. When used, it is divided into several sections according to the length required for the unit length electric power required for insulation. The outermost two ends are respectively connected to the neutral line or the live line for power supply. When used, it is necessary to determine each section of carbon fiber The length of the electric heating wire segment is also determined by the voltage used when the carbon fiber segment is heated, the resistance value per unit length of the carbon fiber electric heating wire, and the electric power value per unit length of the electric heating belt required for water pipe insulation; the fixed-length carbon fiber electric heating belt has several specified lengths, which are determined by the voltage used when the carbon fiber electric heating wire segment is heated, the resistance value per unit degree of the carbon fiber electric heating wire, the electric power value per unit length of the electric heating belt required for water pipe insulation, and the length of the fixed-length belt. The carbon fiber electric heating wire segment is then folded and arranged to adhere to the outer skin of the fixed-length belt. The two ends of the carbon fiber electric heating wire segment are respectively connected to the neutral wire and the live wire arranged parallel to the two sides thereof, and the ground wire and the spare wire are arranged parallel to the outside of the neutral wire and the live wire in the middle of the inner skin layer and the outer skin layer. The carbon fiber electric heating wire in the wiring space layer is a bare wire or a wire with a plastic sheath. The neutral wire, live wire, ground wire and spare wire used for power supply are bare wires or wires with a plastic sheath. These wires are arranged parallel to each other and extend along the longitudinal middle of the electric heating belt. The spare wire is used as a special wire for series connection or control.

[0017] The inner layer is above the wiring space layer and is closely attached to the outer layer. It corresponds to the outer layer and also supports and protects the layers below. It is made of heat-resistant, flame-retardant, insulating glass fiber or chemical fiber cloth, plastic film or plastic-glass fiber composite material. The inner layer is also the base layer on which the inner layer is attached.

[0018] The inner rubber layer is a rubber layer used to bond the electric heating belt to the water pipe. The rubber layer is a resin-type rubber or a rubber-type rubber of a single-component pressure-sensitive adhesive.

[0019] The release film layer is covered on the inner rubber layer with the same width. It is a strip coated with silicone oil and with a plastic film or paper substrate. It is used to prevent the adhesive layers of the carbon fiber electric heating tape from adhering to each other or being unnecessarily attached to and damaged by other objects during production, transportation and before installation. When adhering to the water pipe, peel off the release film layer to expose the adhesive layer and operate.

[0020] The above layers are tightly combined into a whole strip-shaped carbon fiber electric heating belt.

[0021] Furthermore, the hot water pipe is a PPR pipe, a stainless steel pipe, or an iron pipe with an inner diameter of 15 to 32 mm, and the electrical power per unit length required to be provided for heat preservation of the water pipe is 7 to 15 w / m.

[0022] Furthermore, the continuous carbon fiber electric heating tape has a bandwidth of 1 / 3 to 2 / 3 of the circumference of the water pipe to which it is attached, and the length is divided into a continuous type with unlimited length and a fixed length type with limited length specifications.

[0023] Furthermore, in the wiring space layer of the carbon fiber electric heating belt, there are multi-segment type containing 5 kinds of wires (carbon fiber electric heating wire, neutral wire, live wire, ground wire, spare wire) or non-segment type containing 3 kinds of wires (carbon fiber electric heating wire, ground wire, spare wire). The latter is divided into several segments as needed when used and connected into a segment length for use, while the former is used directly without division.

[0024] Furthermore, the outer skin of the component is made of a heat-resistant and flame-retardant insulating plastic film with a thickness of 0.04 to 1.0 mm. The middle part is where various carbon fiber electric heating wires and electrical wires are located, and parts are left on both sides to bond with the inner skin layer with a width of ≥10 mm.

[0025] Furthermore, the inner rubber layer and the outer rubber layer are coated with resin-type rubber or rubber-type pressure-sensitive adhesive, and the 180° peel strength of the rubber layer is ≥5N / 25mm, the tensile strength is ≥30N / cm, and the temperature resistance is ≥80°C.

[0026] Furthermore, the carbon fiber electric heating wire in the wiring space layer is made of polyvinyl chloride, silicone, or polytetrafluoroethylene with a heat-resistant and flame-retardant outer skin, and the core wire is carbon fiber yarn or bare carbon fiber yarn. In order to reduce the hairiness, it can be twisted into a stranded wire or not twisted according to the situation. The specification of the carbon fiber yarn used is 1 to 24k, the resistance per unit length is 19 to 400Ω / m, and the twisting twist is 40 to 100 twists / meter.

[0027] Furthermore, the segment length of the carbon fiber electric heating wire refers to the specified unit length electric power that the carbon fiber filament can provide for water pipe insulation under a specified voltage at this length. The segment length of the carbon fiber electric heating wire of the continuous carbon fiber electric heating belt is determined according to the voltage (V) at both ends of the carbon fiber segment, the unit length resistance value of the carbon fiber filament (Ω / m), and the unit length electric power value (W / m) required for water pipe insulation. The length of the segment can be calculated according to the following formula: voltage / (unit length resistance*unit length electric power) 1 / 2 .

[0028] Furthermore, the segment length of the carbon fiber electric heating wire of the fixed-length carbon fiber electric heating tape is determined according to the voltage used when heating the carbon fiber electric heating wire segment, the unit length resistance value of the carbon fiber electric heating wire (Ω / m), the unit length electric power value of the electric heating tape required for water pipe insulation (W / m) and the standard length of the fixed-length tape (m), and then the corresponding length of the carbon fiber electric heating wire for each standard fixed-length purpose is calculated by the following formula: the length of the carbon fiber electric heating wire segment = voltage 2 / [Carbon fiber line resistance per unit length*electric power per unit length*fixed length belt specification length].

[0029] Furthermore, the arrangement of the carbon fiber electric heating wire, neutral wire, live wire, ground wire, and spare wire of the continuous multi-segment type of the carbon fiber electric heating belt, the skin wire and the bare wire or the skin wire can be close together, the spacing between the bare wires is ≥3mm, and the distance between the segments is 3 to 10mm when the segments are arranged end to end; the non-segment type contains the carbon fiber electric heating wire, the ground wire, and the spare wire, which are arranged longitudinally in the middle of the electric heating belt, and the ground wire and the spare wire are on both sides of the carbon fiber electric heating wire, the neutral wire, and the live wire, and are 1 to 5mm away from the neutral wire and the live wire, to ensure insulation and convenient wiring during installation;

[0030] Furthermore, the wiring space layer includes one neutral wire, one live wire, and one ground wire for power supply, as well as 1 to 3 spare wires. The neutral wire, live wire, ground wire, and spare wire used to power the electric heating wire are made of plastic copper strands, except for the ground wire which is a bare tinned stranded wire. The outer skin is made of silicone, polytetrafluoroethylene, or polyvinyl chloride. The neutral wire, live wire, ground wire, and spare wire are 0.3 to 0.8 mm thick. 2 Specification.

[0031] Furthermore, the fixed-length electric heating belt is used in situations where it must be used at a short distance during installation. The length specifications of the carbon fiber electric heating belt are 0.25m, 0.5m, and 1.0m. The width of the electric heating belt is 1 / 3 to 2 / 3 of the circumference of the water pipe to be pasted. The wiring space layer contains carbon fiber electric heating wire, neutral wire, live wire, ground wire, and spare wire. The length of the carbon fiber electric heating wire is determined by the length formula of the wire segment. The specification of the carbon fiber electric heating wire used is 1 to 3k, and the unit length electric power is 3 to 15w / m. The actual unit length electric power of carbon fiber electric heating belts of various specifications is converted from the length specification of the electric heating belt, and the length of the carbon fiber wire used corresponding to the carbon fiber electric heating belt of various specifications is calculated. The carbon fiber wire is folded and arranged and adhered to the outer rubber layer of the fixed-length electric heating belt of various specifications. The remaining wires are placed on both sides according to the neutral wire and the live wire, and the ground wire and the spare wire are on both sides of the neutral wire and the ground wire, with a distance of 2 to 5mm from the former.

[0032] Furthermore, the carbon fiber electric heating wire in the wiring space layer is externally connected to a 220V AC power supply, or is powered by a DC power supply with a voltage of 24 to 72V.

[0033] Furthermore, the inner rubber layer and the outer rubber layer are coated with resin-type adhesive and rubber-type pressure-sensitive adhesive, and the 180° peel strength of the adhesive layer is ≥5N / 25mm, the tensile strength is ≥30N / cm, and the temperature resistance is ≥80°C.

[0034] Furthermore, the inner layer is a heat-resistant polyvinyl chloride, polyester, or polyethylene tape with a thickness of 0.1 to 1.0 mm, and is made of a heat-resistant flame-retardant plastic film. On both sides, the inner and outer layers are bonded together by an outer rubber layer to enclose and fix the carbon fiber wires and electrical wires and to provide waterproofing.

[0035] Furthermore, the width of the release film layer is the same as the width of the inner and outer skin layers, and the thickness of the release film is 0.05-0.10 mm.

[0036] Furthermore, the carbon fiber wire in the wiring layer is connected to the live wire and the neutral wire. On the connected neutral wire and live wire, a section of copper wire is exposed with a length of 5 to 8 mm. Similarly, a 5 to 8 mm carbon fiber wire gap is exposed on the carbon fiber wire. The two are combined. One is to surround it with tin foil to prevent the copper wire from cutting the carbon fiber wire, and then there is a copper wire buckle on the outside to press the tin foil tightly. The other is to use thin copper wire to wrap tightly around the place where the carbon fiber and copper wire meet, and then shrink it with a heat shrink tube, or seal it with insulating tape to increase the waterproof function of the joint. The diameter of the copper wire is 0.3 to 0.4 mm, and the thickness of the tin foil is 0.02 to 0.5 mm. The heat shrink tube and insulating tape should be longer than 10 mm to expose the copper wire gap.

[0037] The present invention has at least the following beneficial effects:

[0038] First, the electric heating belt solution will greatly reduce the manufacturing cost compared with the tubular electric heating components. In production, the tubular electric heating components are divided into single pieces of 0.25m, 0.5m, 1m, and 2m. In production, they need to be wrapped around the pipe. During installation, due to the complex conditions of the actual hot water pipes on site, the tubular electric heating components on the water pipes even need to match several specifications for each section of the hot water pipe, resulting in more specifications, more quantities, and more joints. However, this product has a belt from beginning to end, which reduces the vast majority of joints. Compared with the existing technical solutions, it is quick to install, saves 60% of time, saves material costs, saves winding and labor costs for joints, improves work efficiency, saves 50% of material costs, and saves 55% of labor costs.

[0039] Second, the electric heating belt solution greatly reduces the system failure rate. The existing technology has too many joints, which increases product failures and installation failures. This product does not have these problems, and the system failure rate is reduced by 25%.

[0040] Third, it is conducive to the development of large-scale continuous production lines, expanding market share by using low-cost products, and contributing to my country's carbon reduction efforts in saving water, electricity and gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The present invention is attached Figure 1 To Attachment Figure 3 There are 3 pictures in total. Figure 1 The figure shows the basic structure of a continuous multi-segment carbon fiber electric heating belt. Figure 2 The figure shows the basic structure of a continuous single-line carbon fiber electric heating belt. Figure 3 The basic structure of a fixed-length carbon fiber electric heating belt shown provides a further understanding of the present invention, is a part of this application, and explains the principle of the present invention.

[0042] like Figure 1 to Figure 3 As shown: outer skin layer 1, outer skin adhesive layer 2, wiring space layer 3, inner skin layer 4, inner skin adhesive layer 5, release film layer 6, carbon fiber electric heating wire 7, electric wire 8, neutral wire 81, live wire 82, ground wire 83, spare wire 84, heat shrink tube 9, copper wire buckle 10. DETAILED DESCRIPTION

[0043] Example 1

[0044] like Figure 1 The following is the basic structure of a continuous multi-segment carbon fiber electric heating belt:

[0045] The outer skin layer 1 is a glass fiber reinforced polyvinyl chloride plastic film as a base material, with a thickness of 0.04-0.15mm and a width of 30-60mm. The bandwidth is 1 / 3-2 / 3 of the circumference of the wound and pasted water pipe.

[0046] The outer skin adhesive layer 2 is evenly coated on the outer skin layer 1. The coated pressure-sensitive adhesive layer is acrylic type and can be used for high and low surface energy materials. The adhesive layer has a 180° peeling strength of ≥5N / 25mm, a tensile strength of ≥30N / cm, and a temperature resistance of ≥80°C.

[0047] The wiring space layer 3, the electric wire 8 is arranged longitudinally along the middle of the electric heating belt, and the wire ends are exposed outside the inner skin layer 4 and the outer skin layer 1. The core wire of the carbon fiber electric heating wire 7 has a specification of 1K~12K, and the outer skin is made of polytetrafluoroethylene. In addition, the neutral wire 81, the live wire 82, and the spare wire 84 are copper stranded wires with an outer diameter of 1.0~2.0mm and a core wire diameter of 0.3~0.8mm. 2 The outer skin is made of polytetrafluoroethylene, the ground wire 83 is a bare copper stranded wire, the neutral wire 81, the live wire 82, the ground wire 83 are 1 each, and the spare wire 84 is 1 to 2; the carbon fiber electric heating wire 7 is close to the neutral wire 81 and the live wire 82, and is located in the middle of the two. The ground wire 83 and the spare wire 84 are on both sides of the neutral wire 81 and the live wire 82, and the distance is 1 to 5mm; according to the above formula, the length of each specification of the carbon fiber line segment is calculated, and the carbon fiber electric heating wire 7 is cut into segments, and the segments are parallel to the neutral wire 81 and the live wire 82 on both sides, and the two ends are respectively connected to the neutral wire 81 and the live wire 82 to receive electricity, and the segments are They should also be arranged in sequence from beginning to end to form a continuous and non-overlapping electric heating line on the electric heating belt; the electric power per meter of the carbon fiber segment is 8-15w / m; the carbon fiber segment uses 220V AC voltage or 24-72V DC voltage; when the carbon fiber electric heating line 7 is connected to the neutral line 81 and the live line 82, 5-8mm carbon fiber filaments are exposed at the connection of the line segment of the carbon fiber electric heating line 7, and are placed on the copper wire with a 5-8mm gap exposed, and are tightly wrapped with thin copper wire, the diameter of the copper wire is 0.3-0.4mm, and then heat-shrunk firmly with heat shrink tube 9, and the heat shrink tube 9 should be longer than 15mm on both sides of the gap that exposes the copper wire.

[0048] The inner layer 4 is as wide as the outer layer 1, and is made of heat-resistant polyvinyl chloride or polyester, with a thickness of 0.02 to 0.10 mm. It uses a heat-resistant flame-retardant insulating film and is surrounded by the outer layer 1 on the top, bottom and sides of the wiring space layer 3, leaving a distance of more than 1.0 cm on both sides. The inner layer 4 and the outer layer 1 are firmly bonded by the outer rubber layer 2.

[0049] The inner skin adhesive layer 5 is evenly coated on the inner skin layer 4. The pressure-sensitive adhesive layer is acrylic type and can be used for high and low surface energy materials. The adhesive layer has a 180° peel strength of ≥5N / 25mm, a tensile strength of ≥30N / cm, and a temperature resistance of ≥80°C.

[0050] The release film layer 6 has a PET base material, with silicone oil or a release agent coated on the surface, a thickness of 0.04-0.10 mm, and a width equal to the width of the inner skin layer 4 and the outer skin layer 1 .

[0051] Example 2

[0052] like Figure 2 The following is the basic structure of a continuous carbon fiber electric heating belt:

[0053] The outer layer 1 is a polyvinyl chloride plastic film with a thickness of 0.02-0.15 mm and a width of 30-60 mm. The width of the film is 1 / 3-2 / 3 of the circumference of the water pipe to be wound and pasted.

[0054] The outer skin adhesive layer 2 is evenly coated on the outer skin layer 1. The coated pressure-sensitive adhesive layer is a silicone adhesive type. The adhesive layer has a 180° peeling strength of ≥5N / 25mm, a tensile strength of ≥30N / cm, and a temperature resistance of ≥80°C.

[0055] Wiring space layer 3, the core wire of the carbon fiber electric heating wire 7 has a specification of 1K~6K, and the outer skin is made of silicone material. In addition, the spare wire 84 is a copper stranded wire with a silicone outer skin, and the ground wire 83 is a bare tinned copper stranded wire with a core wire diameter of 0.3~0.8mm 2 , a carbon fiber electric heating wire 7, a ground wire 83, and a spare wire 84; the carbon fiber electric heating wire 7 is in the middle of the belt, and the ground wire 83 and the spare wire 84 are extended parallel to each other on both sides of the carbon fiber electric heating wire 7, with a distance of 1 to 5 mm; the electric power per meter of each wire segment is 8 to 12 w / m.

[0056] The inner layer 4 is a tape with a polyester base material with a thickness of 0.02 to 0.10 mm. Together with the outer layer 1, it surrounds the wiring space layer 3 above, below and on both sides, leaving a 0.5 to 1 cm space on both sides. The outer adhesive layer 2 adheres the inner layer 4 and the outer layer 1 firmly.

[0057] The inner skin adhesive layer 5 is evenly coated on the inner skin layer 4. The pressure-sensitive adhesive layer is a rubber-type adhesive. The adhesive layer has a 180° peeling strength of ≥5N / 25mm, a tensile strength of ≥30N / cm, and a temperature resistance of ≥80°C.

[0058] The release film layer 6 has the same width as the outer skin layer 1 and the inner skin layer 4 . The base material of the release film layer 6 is PE coated with silicone oil or release agent. The thickness is 0.04-0.10 mm, and the width is the width of the outer skin layer 1 and the inner skin layer 4 .

[0059] Example 3

[0060] like Figure 3 The basic structure of a fixed-length carbon fiber electric heating belt is shown below:

[0061] The outer skin layer 1 is a polyvinyl chloride plastic film as a base material with a thickness of 0.02-0.15 mm and a bandwidth of 1 / 3-2 / 3 of the circumference of the wound and pasted water pipe.

[0062] The outer skin adhesive layer 2 is evenly coated on the outer skin layer 1. The pressure-sensitive adhesive layer is polyurethane type and can be used for high and low surface energy materials. The adhesive layer has a peel strength of ≥5N / 25mm, a tensile strength of ≥30N / cm, and a temperature resistance of ≥80°C.

[0063] Wiring space layer 3, fixed length tape is divided into 1m, 0.5m, 0.25m length types, each meter electric power is 8 ~ 15w / m, the carbon fiber electric heating wire 7, neutral wire 81, live wire 82, ground wire 83, spare wire 84 are arranged side by side close to each other, along the extension direction of the carbon fiber electric heating tape parallel arrangement, carbon fiber electric heating wire 7 in the middle, neutral wire 81, live wire 82 on both sides, ground wire 83 and spare wire 84 on both sides of the neutral wire 81, live wire 82, the distance ≤ 3mm; the core wire of the carbon fiber electric heating wire 7, the specification is 1K ~ 3K, the outer skin is Made of polytetrafluoroethylene, the carbon fiber electric heating wire 7 of the fixed-length carbon fiber electric heating belt is calculated by the calculation formula of the line segment length of the carbon fiber electric heating wire 7, which is arranged on the inner skin rubber layer 5 of the fixed-length belt in multiple turns. The two ends of the carbon fiber electric heating wire 7 are connected to the neutral wire 81 and the live wire 82; the neutral wire 81, the live wire 82, the ground wire 83, and the spare wire 84 are copper stranded wires, and the ground wire 83 is a tinned bare copper stranded wire. The outer skin of the remaining wires is made of polytetrafluoroethylene, the outer diameter of the wire is 1.0-2.0mm, and the core wire diameter is 0.3-0.8mm 2 The joint connecting the carbon fiber electric heating wire 7 and the neutral wire 81 or the live wire 82 is a carbon fiber wire with a gap of 5 to 8 mm exposed at one end of the line segment of the two carbon fiber electric heating wires 7. The carbon fiber wire is placed on the exposed 5 to 8 mm copper wire gap from both ends. A copper wire buckle 10 is used to enclose and press the two together. A heat shrink tube 9 is put outside the copper wire buckle 10, which is longer than the copper wire buckle 10 by more than 10 mm, and finally heat-shrunk to secure.

[0064] The inner layer 4 is as wide as the outer layer 1 and is a tape with a base material of heat-resistant polyvinyl chloride, with a base material thickness of 0.02 to 0.10 mm. It surrounds the wiring space layer 3 above and below and on both sides with the outer layer 1, leaving a space of 0.5 to 1 cm on both sides. The inner layer 4 and the outer layer 1 are firmly bonded by the outer adhesive layer 2.

[0065] The inner skin adhesive layer 5 is evenly coated on the inner skin layer 4. The pressure-sensitive adhesive layer is acrylic type and can be used for high and low surface energy materials. The adhesive layer has a 180° peel strength of ≥5N / 25mm, a tensile strength of ≥30N / cm, and a temperature resistance of ≥80°C.

[0066] The release film layer 6 has a base material of a paper-type substrate, and a silicone release agent is coated on the surface. The thickness of the release film layer 6 is 0.04-0.10 mm, and the width of the release film layer is the same as that of the outer skin layer 1 and the inner skin layer 4.

[0067] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. According to the technical essence of the present invention, within the spirit and principles of the present invention, any simple modification, equivalent replacement and improvement made to the above embodiment still falls within the protection scope of the technical solution of the present invention.

Claims

1. A carbon fiber electric heating belt for water pipe insulation, characterized in that: From the outside to the inside, there is an outer skin layer (1) for supporting and protecting, an outer skin glue layer (2) is coated on the outer skin layer (1), an inner skin layer (4) is outside the outer skin glue layer (2), and a sandwich wiring space layer (3) is provided on the outer skin glue layer (2) and below the inner skin layer (4) along the longitudinal middle part of the carbon fiber electric heating belt. The outer skin layer (1) and the inner skin layer (4) on both sides of the wiring space layer (3) are bonded and sealed by the outer skin glue layer (2). In the wiring space layer (3), carbon fiber electric heating wires (7) and electric wires (8) are longitudinally and parallelly laid, and the electric wires (8) are bonded and fixed by the outer skin glue layer (2). An inner skin glue layer (5) is provided outside the inner skin layer (4) for adhering to the water pipe, and a release film layer (6) is provided outside the inner skin glue layer (5) for isolating the glue layer, so as to form a continuous or fixed-length strip water pipe insulation material.

2. The carbon fiber electric heating belt for water pipe insulation according to claim 1, characterized in that: The outer layer (1), inner layer (4) and release film layer (6) of the electric heating belt have the same width, which is 1 / 3 to 2 / 3 of the circumference of the water pipe to which it is attached. The middle part of the outer layer (1) and the inner layer (4) along the longitudinal direction of the electric heating belt is the location of various carbon fiber electric heating wires (7) and electric wires (8). The inner layer (4) and the outer layer (1) are bonded and fixed on both sides of the wiring space layer (3) leaving a distance of ≥10mm. The outer layer (1) is made of plastic film, glass fiber or chemical fiber cloth or a composite material of plastic and glass fiber. The inner layer (4) is made of heat-resistant, flame-retardant and insulating plastic film, glass fiber or chemical fiber cloth or a composite material of plastic and glass fiber. The outer rubber layer (2) and the inner rubber layer (5) are pressure-sensitive adhesives. The base material of the release film layer (6) is plastic film or paper, and the surface is coated with silicone oil.

3. The carbon fiber electric heating belt for water pipe insulation according to claim 1, characterized in that: In the wiring space layer (3), the carbon fiber electric heating wire (7) is centered. The carbon fiber electric heating wire (7) is a bare wire or a sheathed wire. The core wire specification is 1 to 24k. The outer sheath is made of silicone or polytetrafluoroethylene or heat-resistant polyvinyl chloride. It can also be a bare wire. It is a twisted strand or a non-twisted strand. The strand twist is 40 to 100 twists / meter. The neutral wire (including the negative pole wire of direct current, the same below) (81) and the live wire (including the positive pole wire of direct current, the same below) (82) are close to each other. A carbon fiber electric heating wire (7), a ground wire (83) and a spare wire (84) are on both sides thereof, a neutral wire (81), a live wire (82) and a ground wire (83) are each one, and there are 1 to 3 spare wires (84). The neutral wire (81), the live wire (82) and the spare wire (84) are copper strands, and the outer skin is made of polyvinyl chloride, silicone or polytetrafluoroethylene. The ground wire (83) is a bare copper strand, and is powered by a 220V alternating current or a 24 to 72V direct current power supply.

4. The carbon fiber electric heating belt for water pipe insulation according to claim 1, characterized in that: The carbon fiber electric heating wire (7) of the continuous carbon fiber electric heating belt is either a multi-segment type, consisting of multiple carbon fiber electric heating wire (7) segments determined according to the water pipe insulation power, arranged end to end to form a continuous and non-overlapping electric heating wire, and each segment has two ends connected to a neutral wire (81) and a live wire (82) arranged in parallel on both sides to receive power, and outside the neutral wire (81) and the live wire (82), a ground wire (83) or a spare wire (84) is arranged in parallel, and the distance from the neutral wire (81) or the live wire (82) is 1 to 5 mm, or a non-segment type, in which the carbon fiber electric heating wire (7) is composed of a single non-segmented wire, and when in use, it is used separately according to the principle of the length of the segment required for the unit length electric power required for insulation.

5. A carbon fiber electric heating belt for water pipe insulation according to claim 1 or 4, characterized in that: The length of the carbon fiber electric heating wire (7) used in the continuous carbon fiber electric heating belt can be determined by using the voltage (V) used when heating the carbon fiber electric heating wire (7) segment, the resistance value per unit length (Ω / m) of the carbon fiber electric heating wire (7), and the electric power value per unit length (V / m) of the electric heating belt required for water pipe insulation, and the following formula can be used for calculation: The length of the segment = voltage value / (resistance value per unit length * electric power value per unit length) 1 / 2 The core wire of the carbon fiber electric heating wire (7) has a unit length resistance of 19 to 400 Ω / m, the electric power per meter provided for water pipe insulation is 7 to 15 w / m, and the end-to-end distance between two segments of the carbon fiber electric heating wire (7) is ≤50 mm.

6. The carbon fiber electric heating belt for water pipe insulation according to claim 1, characterized in that: The line segment length of the carbon fiber electric heating wire (7) in the fixed-length carbon fiber electric heating belt is determined by the voltage value (V) used when heating the line segment of the carbon fiber electric heating wire (7), the unit length resistance value (Ω / m) of the carbon fiber electric heating wire (7), the unit length electric power value (V / m) of the electric heating belt required for water pipe insulation, and the specific length (m) of the fixed-length belt. The corresponding length of the carbon fiber electric heating wire (7) for each specific fixed-length purpose is calculated by the following formula: the length of the line segment of the carbon fiber electric heating wire (7) = voltage 2 / [carbon fiber line resistance per unit length*electric power per unit length*fixed length belt specification length], a carbon fiber electric heating line (7) line segment of a fixed length is folded and arranged and adhered to a fixed length outer skin (1), and the two ends of the central carbon fiber electric heating line (7) line segment are respectively connected to a neutral line (81) and a live line (82) arranged in parallel on both sides thereof to receive electricity, and a ground line (83) and a spare line (84) are arranged in parallel outside the neutral line (81) and the live line (82), with a distance of ≤3mm.

7. A carbon fiber electric heating belt for water pipe insulation according to claim 1 or 4, characterized in that: A continuous multi-segment carbon fiber electric heating belt, wherein the core wire specification of the carbon fiber wire (7) is 1K to 12K, and the wire diameter of all the electric wires (8) is 0.3 to 0.8 mm 2 The outer layer (1) is a glass fiber reinforced polyvinyl chloride plastic film as the base material with a thickness of 0.02 to 0.15 mm. The outer rubber layer (2) and the inner rubber layer (5) are acrylic pressure-sensitive adhesives. The inner layer (4) is a heat-resistant polyvinyl chloride material with a thickness of 0.02 to 0.10 mm. The release film layer (6) is a paper-type base material with a thickness of 0.05 to 0.10 mm.

8. A carbon fiber electric heating belt for water pipe insulation according to claim 1 or 4, characterized in that: A continuous, segment-free carbon fiber electric heating belt, wherein the core wire specification of the carbon fiber wire (7) is 1K to 6K, and the wire diameter of all the electric wires (8) is 0.3 to 0.8 mm 2 The outer layer (1) is a glass fiber reinforced polyvinyl chloride plastic film as a base material with a thickness of 0.02 to 0.15 mm, the outer rubber layer (2) and the inner rubber layer (5) are silicone-type pressure-sensitive adhesives, the inner layer (4) is a flame-retardant polyester material with a thickness of 0.02 to 0.10 mm, and the release film layer (6) is a paper-type base material with a thickness of 0.05 to 0.10 mm.

9. A carbon fiber electric heating belt for water pipe insulation according to claim 1 or 6, characterized in that: The fixed-length carbon fiber electric heating belt has length specifications of 1m, 0.5m, and 0.25m. The core wire of the carbon fiber electric heating wire (7) has a specification of 1K to 3K, and the wire diameter of all wires (8) is 0.3 to 0.8mm. 2 The outer layer (1) is a polyvinyl chloride plastic film with a thickness of 0.04 to 0.15 mm, the inner layer (4) is a heat-resistant polyvinyl chloride material with a thickness of 0.02 to 0.10 mm, the outer rubber layer (2) and the inner rubber layer (5) are polyurethane pressure-sensitive adhesives, and the release film layer (6) is a PET substrate with a thickness of 0.05 to 0.10 mm.

10. A carbon fiber electric heating belt for water pipe insulation according to claim 4 or 6, characterized in that: When the carbon fiber electric heating wire (7) is connected to the neutral wire (81) and the live wire (82), the line segments of the two carbon fiber electric heating wires (7) are first exposed to 5 to 8 mm of carbon fiber filaments, and then placed on the copper wire with a 5 to 8 mm gap exposed, and then wrapped tightly with tin foil and then compressed with a heat shrink tube (9), and then the heat shrink tube (9) is heat-shrunk firmly at the joint or the polyvinyl chloride insulation tape is wrapped tightly, and the heat-shrunk or wrapped tightly part should be longer than the exposed gap on both sides by more than 10 mm.

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