Pipeline insertion type heating wire

Abstract

The present invention relates to a pipeline insertion-type heating wire, and more particularly, to a pipeline insertion-type heating wire which is inserted into the inside of a pipeline in order to prevent freezing of a water supply pipeline or a water discharge pipeline. To this end, the present invention comprises: a pair of conductors which are made into a wire shape from an alloy containing nickel and chromium-iron or an alloy containing nickel and copper, are arranged side by side in the longitudinal direction at a distance from each other, have power consumption of 8-12 W / m per 1 m by means of serial heating, and generate heat to less than 60 DEG C with an external temperature of 25 + / -2 DEG C as a reference; the inner sheath covers the outer side of each conductor; grounding cables which have tensile force, are spaced apart from the conductor, and are arranged side by side in the length direction; and an outer sheath which maintains the interval between the plurality of conductors and the grounding cable and is sleeved outside.

Description

Technical Field

[0001] The present invention relates to a pipe insertion type heating wire, and more particularly to a pipe insertion type heating wire that is inserted into a water supply pipe or a drainage pipe to prevent the pipe from freezing. Background Art

[0002] In winter, the fluid flowing inside water supply pipes or drainage pipes such as fire protection pipes will freeze. When it freezes, its volume increases, and the pipes cannot withstand the increased fluid volume and often break.

[0003] In order to prevent such pipes from freezing and bursting, many antifreeze devices have been proposed that prevent the fluid from freezing by directly inserting a heating wire into the pipe to heat it.

[0004] For example, in Korean Patent Publication No. 10-2015-0018740 (Antifreeze Heating Wire System), Figure 1 As shown, the PTC heating cable 13 is installed in close contact with or spirally wound on the outer peripheral surface of the pipe 30 along the length direction, and is covered with a heat insulation material 40 on the outside.

[0005] Therefore, the PTC heating cable 13 generates heat by the supplied power, so that the fluid inside the pipe 30 is maintained at a temperature above the freezing temperature, thereby preventing freezing.

[0006] This PTC heating cable 13 usually adopts a constant temperature cable. The heat generated by this constant temperature cable is generated by a plastic semiconductor containing carbon rather than a metal heating wire. It is a self-regulating heating method that utilizes the characteristics of the positive temperature coefficient (PTC).

[0007] That is, the conductive carbon particles form an infinite parallel circuit, automatically changing the heat generation in proportion to the ambient temperature. From the initial operation until the time of achieving an appropriate balance with the external temperature, the power consumed during this operation (32 to 35 W / m) reaches 2 to 2.5 times the power required to maintain the appropriate temperature (16 W / m). Once the appropriate balance is achieved, normal operation will be carried out at a power of 16 W / m.

[0008] Therefore, the power consumption in the initial stage of operation is very large, and since it is a self-regulating type, there is a disadvantage of generating unnecessary power consumption. In addition, since the high temperature is maintained due to the high power consumption in the initial stage, the polymer outer skin that protects the outside of the heating element is easily deteriorated, resulting in a disadvantage of a very short service life.

[0009] Furthermore, when the PTC heating cable 13 is to be repaired or replaced, all finishing materials including the outer insulation material 40 must be removed before construction can be carried out, which is disadvantageous for maintenance. Furthermore, due to the use of indirect heating pipes, the thermal efficiency is also correspondingly reduced.

[0010] In particular, since the structure is installed outside the pipeline and is wrapped with the heat insulating material 40, there is also a problem that it is very easy to cause a fire.

[0011] In addition, since it is very expensive, it cannot be installed on the entire pipeline and is usually only installed in local parts that are prone to freezing. Therefore, the antifreeze effect for pipelines installed over long distances is not ideal.

[0012] Due to many problems in the case of installing a PTC heating cable outside a pipe, a method of inserting a heating wire into the pipe is generally used. For example, in Korean Patent Publication No. 10-2014-005255 (Antifreezing Device for Pipeline), Figure 2 As shown, the heating wire 132 is inserted along the length direction and laid on the inner side of the pipe 102 where the fluid flows. The two side parts of the heating wire 132 are led out to the outside of the pipe 102 through the connecting valve 120, so that power is supplied through the led-out parts to solve the problems of freezing and freezing.

[0013] However, when using PTC heating cables as the heating wire 132, the installation cost is very high because the cables are very expensive. In addition, the tensile strength is very low, which leads to the possibility of breakage and other damage when the cables are installed inside a long-distance pipeline, thus requiring frequent maintenance and repair.

[0014] Prior art literature

[0015] 1. Korean Patent Publication No. 10-2015-0018740

[0016] (Anti-freeze heating wire system)

[0017] 2. Korean Patent Publication No. 10-2014-005255

[0018] (Antifreeze device for pipes) Summary of the Invention

[0019] The present invention aims to solve this conventional problem by providing a pipe-insertion type heating wire having a first coating formed of heat-resistant and chemical-resistant polytetrafluoroethylene on the outside of a conductor made of a nickel-chromium-iron alloy or a nickel-copper alloy, depending on the length. A metal wire is used to improve grounding and tensile strength, and an outer sheath is formed of a coating material containing heat-resistant PVC or heat-resistant PVC and silicon. The wire is then inserted into a pipe to prevent freezing.

[0020] To achieve the aforementioned objectives, the present invention provides a pipe-insertion heating cable comprising: a pair of conductors, fabricated into a wire-like configuration from an alloy containing nickel and chromium-iron or an alloy containing nickel and copper, spaced apart and arranged side by side along the length thereof, utilizing a series heating method to achieve a power consumption of 8W / m to 12W / m per meter, generating heat to a temperature below 60°C based on an external temperature of 25±2°C; an inner sheath covering the outer surfaces of the conductors; a grounding cable having a tensile strength, spaced apart from the conductors and arranged side by side along the length thereof; and an outer sheath extending over the outer surface of the plurality of conductors, maintaining a spacing between the conductors and the grounding cable.

[0021] According to the present invention as described above, there are the following advantages. By inserting and laying a heating wire including a conductor made of an alloy containing nickel and chromium-iron or an alloy containing nickel and copper inside a pipeline according to the length through a series heating method, the power consumption can reach 8W / m to 12W / m, that is, the power consumption is extremely low and semi-permanent use is achieved. Moreover, due to its heat resistance, the risk of fire is extremely low. Moreover, since the tensile strength of the grounding wire is very high and the price is low, it can be stably laid inside a long-distance pipeline. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a diagram showing the structure of an antifreeze heating wire system based on the prior art.

[0023] Figure 2 This figure shows a state where a heating wire is inserted and laid inside a pipe according to the conventional technology.

[0024] Figure 3 This is a diagram showing the structure of a tube-insertion type heating wire according to the present invention.

[0025] Figure 4 It is a cross-sectional structural diagram of the present invention.

[0026] Figure 5 This is a graph showing the heating temperature of the heating wire when the conductor length is 10 m.

[0027] Figure 6 This is a graph showing the heating temperature of the heating wire when the conductor length is 30 m.

[0028] Description of Reference Signs

[0029] 130: Heating line

[0030] 131, 131': conductor

[0031] 132, 132': inner sheath

[0032] 133, 133': Grounding cable

[0033] 134: Outer sheath DETAILED DESCRIPTION

[0034] The above-mentioned objects, features and advantages will be described in detail with reference to the accompanying drawings, so that ordinary technicians in the technical field to which the present invention belongs can easily implement the technical ideas of the present invention.

[0035] When describing the present invention, if it is determined that a detailed description of a known technique related to the present invention may unnecessarily obscure the gist of the present invention, the detailed description will be omitted.

[0036] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0037] However, the embodiments of the present invention illustrated below can be modified in various modes, and the scope of the present invention is not limited to the embodiments described below.

[0038] The embodiments of the present invention are provided to more completely explain the present invention to persons skilled in the art to which the present invention pertains.

[0039] Figure 3 This figure shows the structure of the tube insertion type heating wire of the present invention. It is roughly composed of a pair of conductors 131 and 131 ′, inner sheaths 132 and 132 ′, a pair of ground cables 133 and 133 ′, and an outer sheath 134 .

[0040] The pair of conductors 131, 131' generate heat through their resistance components and are made of a nickel and chromium-iron alloy or a nickel and copper alloy into a wire shape according to the length of the conductors 131, 131'. The pair of conductors 131, 131' are spaced apart and arranged side by side along the length direction.

[0041] In this case, the length of the conductors 131 and 131' can be the length of the interval for heating water inside the water supply pipe or the drainage pipe, for example, a unit length of 10m, 30m, 50m, 60m, 80m, etc., to prevent the water supply pipe or the drainage pipe from freezing.

[0042] The conductors 131 and 131 ′ have their power consumption per meter determined by the ratio of nickel to chromium-iron or nickel to copper according to their length, and can achieve constant heating with a power consumption of 8W / m to 12W / m in a series heating manner, thereby avoiding unnecessary power consumption.

[0043] That is, regardless of changes in external temperature, heat generation can be achieved through a constant power consumption of 8W / m2 to 12W / m2 during initial operation and normal operation.

[0044] The inner sheaths 132, 132' are formed by coating or extruding polytetrafluoroethylene on the outside of each of the conductors 131, 131'. This polytetrafluoroethylene has heat resistance, chemical resistance, and flexibility, and insulates the conductors 131, 131'. It has a heat resistance of over 105°C. Therefore, even at the maximum instantaneous allowable temperature of the heating wire of 105°C, the insulation is not destroyed, and stable insulation can be achieved.

[0045] The pair of conductors 131, 131' and the pair of grounding cables 133, 133' are spaced apart from each other and arranged side by side along the length direction. The grounding cables 133, 133' are formed into an integrated body by tinned multiple copper wires arranged side by side, thereby forming a grounding cable 133, 133'. The grounding cables 133, 133' can not only serve as grounding cables, but also can be used as tensile cables due to their tensile force.

[0046] In particular, the heating wire should be laid in the center as much as possible inside a vertically installed pipeline. Therefore, when the heating wire is laid over a long distance inside a pipeline of several tens of meters, the tensile force of the grounding cables 133, 133' can prevent the heating wire from breaking.

[0047] Furthermore, if a heating wire is laid over a long distance inside a horizontally arranged pipe, the heating wire will sag. If this wire comes into contact with the inner surface of the PVC pipe, it may melt or deform the pipe. However, by applying a tensile force to the grounding cables 133 and 133', the heating wire is prevented from contacting the inner surface of the pipe, thereby resolving this problem.

[0048] The outer sheath 134 is made of heat-resistant PVC. By extruding the conductors 131, 131' and the grounding cables 133, 133' that have formed the inner sheath 132 together, not only can the multiple conductors 131, 131' and the grounding cables 133, 133' be kept apart from each other, but also be covered on the outside to provide protection.

[0049] Silicone and heat-resistant PVC may be mixed and then extruded to prevent the outer sheath 134 from being easily hardened by heat and to allow it to be easily laid inside a curved pipe due to its flexibility.

[0050] Furthermore, double insulation is formed by the inner sheaths 132 and 132 ′ and the outer sheath 134 , so that the insulating material can be safely laid inside a pipeline.

[0051] Furthermore, by adjusting the content of nickel and chromium-iron or nickel and copper components constituting the conductors 131 and 131', the conductors 131 and 131' have a heating value of 8W / m to 12W / m, and heat is generated to below 60°C based on an external temperature of 25±2°C, thereby avoiding damage to the PVC pipe by melting or deformation. Furthermore, the heating value can be adjusted by adjusting the content of nickel and chromium-iron or nickel and copper components, thereby enabling customized production that meets laying conditions.

[0052] Table 1 below shows the nickel and chromium-iron or nickel and copper contents of each conductor 131, 131' with a length of 10m, 30m, 50m, 60m, and 80m, the number of conductor strands constituting one conductor, and the resistance value of each conductor strand, for each conductor 131, 131' configured so that the heating wire generates heat to below 60°C at an external temperature of 25±2°C by providing a pair of conductors 131, 131' with a heating value of 8W / m to 12W / m.

[0053] Table 1

[0054]

[0055] Ferrochromium is an alloy containing chromium and iron, and contains 30 to 50 weight percent of iron.

[0056] Furthermore, the number of conductor strands refers to the number of strands constituting one conductor 131 , 131 ′, 1P refers to the resistance value of one conductor 131 , 131 ′, and 2P refers to the total resistance value of a pair of conductors 131 , 131 ′.

[0057] In addition, the range of the component ratio, the number of conductor strands, and the resistance value of each conductor for a conductor with a length of 10 m includes the component ratio, the number of conductor strands, and the resistance value of each conductor for a conductor with a length of 5 to 19 m, the range of the component ratio, the number of conductor strands, and the resistance value of each conductor for a conductor with a length of 30 m includes the component ratio, the number of conductor strands, and the resistance value of each conductor for a conductor with a length of 20 to 39 m, the range of the component ratio, the number of conductor strands, and the resistance value of each conductor for a conductor with a length of 50 m includes the component ratio, the number of conductor strands, and the resistance value of each conductor for a conductor with a length of 40 to 55 m, the range of the component ratio, the number of conductor strands, and the resistance value of each conductor for a conductor with a length of 60 m includes the component ratio, the number of conductor strands, and the resistance value of each conductor for a conductor with a length of 56 to 75 m, and the range of the component ratio, the number of conductor strands, and the resistance value of each conductor for a conductor with a length of 80 m includes the component ratio, the number of conductor strands, and the resistance value of each conductor for a conductor with a length of 76 to 80 m or more.

[0058] That is, by adjusting the component ratio of the conductor and the number of conductor strands within a certain range, the conductor can have an appropriate resistance value within the length range of the conductor mentioned above.

[0059] On the other hand, when the pipe has a large diameter or is used in an extremely cold area with extremely low external temperature, the heat generation needs to be increased to about 14 to 16 W / m. In this case, the outer sheath 134 made of PVC may deteriorate due to the heating temperature. Therefore, polytetrafluoroethylene can be used instead of PVC to form the outer sheath 134.

[0060] This polytetrafluoroethylene has a heat-resistant temperature of 300°C or higher, so it will not deteriorate even if the heating value is increased.

[0061] Figure 5 The heating temperature of the heating wire in which the conductor 131 is covered with the inner sheath 132 and the outer sheath 134 is 55° C. when the length of the conductor 131 is 10 m and the external temperature is 24.9° C.

[0062] This satisfies the requirement that the heating wire of the present invention generates heat to a temperature lower than 60° C. based on an external temperature of 25±2° C., which is a heating condition.

[0063] also, Figure 6 The heating wire having the inner sheath 132 and the outer sheath 134 covering the conductor 131 has a heating temperature of 57.6°C when the length of the conductor 131 is 30m and the external temperature is 26.1°C. Furthermore, the heating wire of the present invention heats to below 60°C based on the external temperature of 25±2°C as the heating condition.

[0064] Above, specific parts of the present invention are described in detail. For ordinary technicians in the field to which the present invention belongs, such specific descriptions are only preferred embodiments. Obviously, the scope of the present invention is not limited thereto.

[0065] Therefore, the essential scope of the present invention should be defined by the appended claims and their equivalent technical solutions.

Claims

1. A pipe-insertion heating wire, which is inserted and laid along its length inside a pipe through which fluid flows, with both sides extending to the outside of the pipe to receive power required for heating. The pipe-insertion heating wire is characterized by comprising: A pair of conductors, made of an alloy containing 73 to 83 weight percent nickel and 17 to 27 weight percent chromium-iron, are formed into a wire shape, are spaced apart and arranged side by side in the length direction, and are heated in series to a power consumption of 8 to 12 W / m per meter, heating to a temperature below 60°C based on an external temperature of 25±2°C. an inner sheath covering the outer side of each of the conductors; a grounding cable having a tensile force, spaced apart from the conductor and arranged side by side in a length direction; and The outer sheath keeps the plurality of conductors and the grounding cable spaced apart and is covered on the outside.

2. A pipe-insertion heating wire, which is inserted and laid along its length inside a pipe through which fluid flows, with both sides extending to the outside of the pipe to receive power required for heating. The pipe-insertion heating wire is characterized by comprising: A pair of conductors, made of an alloy containing 15 to 30 weight percent nickel and 70 to 85 weight percent copper, are formed into a wire shape, are spaced apart and arranged side by side in the length direction, and are heated in series to a power consumption of 8 to 12 W / m per meter, with the temperature being lower than 60°C based on an external temperature of 25±2°C. an inner sheath covering the outer side of each of the conductors; a grounding cable having a tensile force, spaced apart from the conductor and arranged side by side in a length direction; and The outer sheath keeps the plurality of conductors and the grounding cable spaced apart and is covered on the outside.

3. A pipe-insertion heating wire, which is inserted and laid along its length inside a pipe through which fluid flows, with both sides extending to the outside of the pipe to receive power required for heating. The pipe-insertion heating wire is characterized by comprising: A pair of conductors, made of an alloy containing 3 to 15 weight percent nickel and 85 to 97 weight percent copper in the shape of metal wires, spaced apart and arranged side by side in the length direction, are heated in series to a power consumption of 8 to 12 W / m per meter, and are heated to below 60°C based on an external temperature of 25±2°C; an inner sheath covering the outer side of each of the conductors; a grounding cable having a tensile force, spaced apart from the conductor and arranged side by side in a length direction; and The outer sheath keeps the plurality of conductors and the grounding cable spaced apart and is covered on the outside.

4. A pipe-insertion heating wire, which is inserted and laid along its length inside a pipe through which fluid flows, with both sides extending to the outside of the pipe to receive power required for heating. The pipe-insertion heating wire is characterized by comprising: A pair of conductors, made of an alloy containing 5 to 15 weight percent nickel and 85 to 95 weight percent copper in the shape of metal wires, spaced apart and arranged side by side in the length direction, are heated in series to a power consumption of 8 to 12 W / m per meter, and are heated to a temperature below 60°C based on an external temperature of 25±2°C; an inner sheath covering the outer side of each of the conductors; a grounding cable having a tensile force, spaced apart from the conductor and arranged side by side in a length direction; and The outer sheath keeps the plurality of conductors and the grounding cable spaced apart and is covered on the outside.

5. A pipe-insertion heating wire, which is inserted and laid along its length inside a pipe through which fluid flows, with both sides extending to the outside of the pipe to receive power required for heating. The pipe-insertion heating wire is characterized by comprising: A pair of conductors, made of an alloy containing 1 to 7 weight percent nickel and 93 to 99 weight percent copper in the shape of metal wires, spaced apart and arranged side by side along the length direction, are heated in series to a power consumption of 8 to 12 W / m per meter, and are heated to a temperature below 60°C based on an external temperature of 25±2°C; an inner sheath covering the outer side of each of the conductors; a grounding cable having a tensile force, spaced apart from the conductor and arranged side by side in a length direction; and The outer sheath keeps the plurality of conductors and the grounding cable spaced apart and is covered on the outside.

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