Fluoropolymer explosion-proof constant-power series ribbon heater

Abstract

The invention solves the problem that an insulating layer of a series ribbon heater is easy to crack when the temperature of the series ribbon heater changes, and relates to the field of series ribbon heaters, in particular to a fluoropolymer explosion-proof constant-power series ribbon heater which comprises a conductive core, and the outer surface of the conductive core is sequentially sleeved with a main insulating layer, a reinforced insulating layer, a shielding layer and a reinforced sheath from inside to outside. The reinforcing insulating layer comprises an insulating sleeve wrapping the outer surface of the main insulating layer, the inner wall and the outer wall of the insulating sleeve are each provided with a plurality of structural gaps which are annularly arranged, reinforcing pieces are arranged in the structural gaps, and when the conductive core generates heat to generate temperature change, the reinforcing pieces provide support for the insulating sleeve and compensate expansion. According to the invention, through the combined use of double-layer insulation, the thermal expansion effect can be effectively treated without affecting the electrical performance, and in addition, the plurality of structural gaps formed in the insulation sleeve and the reinforcing sheets arranged in the structural gaps are matched, so that the stress caused by temperature change is effectively dispersed, and the insulation sleeve is prevented from cracking or deforming.

Description

Technical Field

[0001] The invention relates to the technical field of series electric heating belts, in particular to a fluoropolymer explosion-proof constant-power series electric heating belt. Background Art

[0002] Series electric heating tape is a kind of equipment commonly used for heating and heat preservation, and is widely used in the petroleum, chemical, construction and other industries. It uses the principle of resistance heating to pass current through conductive materials to generate heat, which can make the electric heating tape evenly heated over a long length. It is usually installed on the surface of pipes, containers or equipment to prevent fluid freezing, maintain process temperature or improve fluid fluidity. At the same time, because the electric heating tape generates heat during operation, frequent heating and cooling will cause stress in the insulating material during thermal expansion and contraction, which is easy to cause cracking. Summary of the invention

[0003] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a fluoropolymer explosion-proof constant power series electric heating belt to solve the problem that when the temperature of the series electric heating belt changes, its insulation layer is prone to cracking due to excessive stress.

[0004] To achieve the above object, the present invention provides the following technical solution: a fluoropolymer explosion-proof constant power series electric heating belt, comprising a conductive core, the outer surface of which is sequentially covered with a main insulating layer, a reinforced insulating layer, a shielding layer and a reinforced sheath from the inside to the outside;

[0005] The reinforced insulation layer includes an insulation sleeve wrapped around the outer surface of the main insulation layer. The inner wall and the outer wall of the insulation sleeve are both provided with a plurality of structural gaps arranged in a ring shape. A reinforcement sheet is provided inside the structural gap. When the conductive core generates heat and produces temperature changes, the reinforcement sheet provides support for the insulation sleeve and compensates for expansion.

[0006] Preferably, the structural gap includes a straight cavity and two side cavities forming a reinforcing sheet insertion channel on the insulating sleeve;

[0007] The two side cavities are respectively located on both sides of the straight cavity and are communicated with each other. The lengths of the straight cavity and the side cavity are consistent with the length of the insulating sleeve.

[0008] Preferably, the cross-sectional shape of the straight cavity is a triangle, and the angle of the triangle close to the inner side of the insulating sleeve is no more than 30°, and the depth of the straight cavity is less than one third of the thickness of the insulating sleeve.

[0009] Preferably, the side cavity is in a wave shape that rises and falls, and the height difference between the highest point and the lowest point of the side cavity is no more than 2 mm.

[0010] Preferably, the reinforcing sheet comprises a metal sheet arranged inside the straight cavity and a plurality of arc-shaped sheets installed on both sides of the metal sheet, and the arc-shaped sheets are inserted into the inside of the side cavity.

[0011] Preferably, the cross-sectional shape of the metal sheet is V-shaped, and the side surface of the metal sheet fits the inner wall of the straight cavity. A plurality of arc-shaped sheets are distributed at the trough position of the side cavity and have the same curvature as the trough position.

[0012] Preferably, a metal wire is fused inside the insulating sleeve, and the metal wire is embedded in the insulating sleeve in a spring shape.

[0013] Preferably, the material of the metal sheet and the arc-shaped sheet includes but is not limited to nickel alloy and copper alloy;

[0014] The material of the main insulating layer is any one of polyethylene and polyvinyl chloride, and the material of the insulating sleeve is any one of polyurethane, silicone and fluoropolymer.

[0015] By means of the above technical solution, the present invention provides a fluoropolymer explosion-proof constant power series electric heating belt, which has at least the following beneficial effects:

[0016] 1. The series electric heating belt is used in combination with the main insulation layer and the reinforced insulation layer. It can effectively deal with the thermal expansion effect without affecting the electrical performance, reduce the occurrence of electrical short circuit and leakage, and ultimately achieve an explosion-proof effect.

[0017] 2. The series electric heating belt utilizes several structural gaps opened on the insulating sleeve to provide space for expansion, and at the same time disperses the expansion stress in the gaps to avoid cracking or deformation of the material due to excessive thermal expansion.

[0018] 3. The series electric heating belt uses a V-shaped metal sheet fitted in the straight cavity to effectively disperse the stress caused by temperature changes, further avoid cracking or deformation of the insulating sleeve, and provide additional support for the electric heating belt to enhance the stability of the overall structure.

[0019] 4. The reinforced insulation layer of the series electric heating belt can effectively increase the fixing force between the reinforcing sheet and the structural gap, reducing the risk of the reinforcing sheet falling off and being pulled out due to external force or temperature changes. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0021] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0022] Figure 2 It is a schematic diagram of the structure of the reinforced insulating layer of the present invention;

[0023] Figure 3 It is a schematic diagram of the structure of the reinforcing sheet of the present invention;

[0024] Figure 4 It is a schematic diagram of the structure of the structural gap of the present invention;

[0025] Figure 5 It is a schematic diagram of the position structure of the reinforcing sheet and the metal wire of the present invention.

[0026] In the figure: 1. Conductive core; 2. Main insulation layer; 3. Reinforced insulation layer; 301. Insulation sleeve; 302. Structural gap; 3021. Straight cavity; 3022. Side cavity; 303. Reinforcement sheet; 3031. Metal sheet; 3032. Arc sheet; 304. Metal wire; 4. Shielding layer; 5. Reinforced sleeve. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. In the description of the present invention, it should be understood that the orientations or positional relationships indicated by the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0028] Embodiment 1

[0029] See also Figure 1-Figure 5, this embodiment proposes a fluoropolymer explosion-proof constant power series electric heating belt, which can effectively deal with the thermal expansion effect. The middle of the series electric heating belt is a conductive core 1, which is made of metal wire and is mainly used to transfer current and generate heat. The outer surface of the conductive core 1 is sequentially covered with a main insulating layer 2, a reinforced insulating layer 3, a shielding layer 4 and a reinforced sheath 5 from the inside to the outside. The main insulating layer 2 is made of polyethylene, polyvinyl chloride and other medium materials with good electrical insulation properties. It is tightly wrapped on the outside of the conductive core 1 and is mainly used to isolate the current and prevent it from leaking. The reinforced insulating layer 3 is located on the outside of the main insulating layer 2 and is mainly used to increase the overall mechanical strength and insulation performance of the series electric heating belt. The shielding layer 4 is composed of metal braiding, which is conductive and can isolate the electric field and magnetic field, and mainly plays the role of electromagnetic interference prevention and electrical shielding. The reinforced sheath 5 is the outermost layer of the series electric heating belt, which is preferably made of polyvinyl fluoride material with high durability, which can effectively protect the series electric heating belt from external physical damage, and can also effectively prevent water and moisture, ensuring the safety of the series electric heating belt in a humid environment. The purpose of double insulation is achieved by combining the main insulation layer 2 and the reinforced insulation layer 3, wherein the inner main insulation layer 2 is used to provide stable electrical isolation, while the outer reinforced insulation layer 3 can adapt to temperature changes and expand and contract freely. The combination of the two can effectively deal with the thermal expansion effect without affecting the electrical performance, while reducing the occurrence of electrical short circuits and leakage, and reducing the risk of sparks.

[0030] Embodiment 2

[0031] During the operation of the series heating tape, heat is generated, which causes the thermal expansion and contraction of the material. If the insulation layer fails to effectively adapt to this change, it will cause the insulation layer to crack or peel off, thereby increasing the risk of electrical failure. In order to effectively solve this problem, Figure 2-Figure 4As shown, the reinforced insulating layer 3 in this embodiment includes an insulating sleeve 301 wrapped around the outer surface of the main insulating layer 2. The insulating sleeve 301 is made of any one of polyurethane and silicone. The inner wall and the outer wall of the insulating sleeve 301 are both provided with a plurality of structural gaps 302 arranged in a ring shape. The structural gap 302 is composed of a straight cavity 3021 and two side cavities 3022 formed on the insulating sleeve 301, and the two side cavities 3022 are respectively located on both sides of the straight cavity 3021 and are connected to each other. The lengths of the straight cavity 3021 and the side cavity 3022 are consistent with the length of the insulating sleeve 301. The cross-sectional shape of the straight cavity 3021 is a triangle, and the angle of the triangle close to the inner side of the insulating sleeve 301 is not greater than 30°. The depth of the straight cavity 3021 is less than one third of the thickness of the insulating sleeve 301. A plurality of structural gaps 302 can effectively create an elastic space in the insulating sleeve 301. When the conductive core 1 undergoes a temperature change, the insulating layer and other materials will expand or contract with the temperature change. By providing a V-shaped gap in the reinforced insulating layer 3, space can be provided for expansion to avoid cracking or deformation of the material due to excessive thermal expansion. In addition, the straight cavity 3021 with a triangular structure can disperse the expansion stress in the cavity, thereby reducing the impact of thermal expansion.

[0032] In accordance with the above, by providing a reinforcing sheet 303 inside the structural gap 302, the structural strength and rigidity of the insulating sleeve 301 are increased, and the overall mechanical properties of the series electric heating belt are effectively improved. In addition, the reinforcing sheet 303 is selected to be thin and has a certain flexibility, so that the series electric heating belt maintains a certain degree of bending. And the reinforcing sheet 303 includes a metal sheet 3031 arranged inside the straight strip cavity 3021, the cross-sectional shape of the metal sheet 3031 is V-shaped, and the side of the metal sheet 3031 is in contact with the inner wall of the straight strip cavity 3021, so that the metal sheet 3031 existing in the straight strip cavity 3021 limits the amplitude of thermal expansion through the lower thermal expansion coefficient of the metal material, further reducing the tension caused by expansion or contraction, and at the same time, the V-shaped shape feature of the metal sheet 3031 can also guide the expansion, making it more uniform, and avoiding the insulation sleeve 301 from over-expanding locally.

[0033] Embodiment 3

[0034] like Figure 3 and Figure 4As shown, the side cavity 3022 is in a wave shape that fluctuates up and down, and the height difference between the highest point and the lowest point of the side cavity 3022 is not greater than 2mm. The reinforcing sheet 303 also includes a plurality of arcuate sheets 3032 installed on both sides of the metal sheet 3031, and the arcuate sheets 3032 are inserted into the inside of the side cavity 3022. The plurality of arcuate sheets 3032 are distributed at the trough position on the side cavity 3022, and the curvature of the fluctuation is consistent with the trough position. When the reinforcing sheet 303 and the structural gap 302 are combined with each other, the plurality of arcuate sheets 3032 are embedded in the trough position in the wavy side cavity 3022, and the shape of the wavy groove is used to limit the up and down or left and right displacement of the arcuate sheets 3032, effectively ensuring the fixing effect of the reinforcing sheet 303 in the structural gap 302. In addition, the cooperation between the arc-shaped pieces 3032 on both sides of the V-shaped metal piece 3031 and the wavy side cavity 3022 increases the friction and resistance, so that the metal piece 3031 cannot be easily pulled out along the direction of the cavity when subjected to external force.

[0035] Embodiment 4

[0036] like Figure 2 and Figure 5 As shown, the insulating sleeve 301 is internally fused with a metal wire 304, and the metal wire 304 is spring-shaped and embedded in the insulating sleeve 301. The material of the metal sheet 3031 and the arc-shaped sheet 3032 includes but is not limited to nickel alloy and copper alloy. The spring-shaped metal wire 304 is used to provide elastic support for the insulating sleeve 301 to mitigate the internal deformation of the insulating sleeve 301 caused by thermal expansion and mechanical pressure. In addition, since the metal wire 304, the metal sheet 3031 and the arc-shaped sheet 3032 themselves have good thermal conductivity, they can assist in the uniform distribution and dissipation of heat when the series electric heating belt is working.

[0037] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A fluoropolymer explosion-proof constant power series electric heating belt, comprising a conductive core (1), characterized in that: The outer surface of the conductive core (1) is covered with a main insulating layer (2), a reinforced insulating layer (3), a shielding layer (4) and a reinforced sheath (5) in sequence from the inside to the outside; The reinforced insulating layer (3) comprises an insulating sleeve (301) wrapped around the outer surface of the main insulating layer (2); the inner wall and the outer wall of the insulating sleeve (301) are both provided with a plurality of structural gaps (302) arranged in an annular shape; a reinforcing sheet (303) is provided inside the structural gap (302); when the conductive core (1) generates heat and produces a temperature change, the reinforcing sheet (303) provides support for the insulating sleeve (301) and compensates for expansion.

2. A fluoropolymer explosion-proof constant power series electric heating belt according to claim 1, characterized in that: The structural gap (302) comprises a straight cavity (3021) and two side cavities (3022) formed on the insulating sleeve (301) to form a channel for inserting the reinforcing sheet (303); The two side cavities (3022) are respectively located on both sides of the straight cavity (3021) and are in communication with each other. The lengths of the straight cavity (3021) and the side cavity (3022) are consistent with the length of the insulating sleeve (301).

3. A fluoropolymer explosion-proof constant power series electric heating belt according to claim 2, characterized in that: The cross-sectional shape of the straight cavity (3021) is a triangle, and the angle of the triangle close to the inner side of the insulating sleeve (301) is no greater than 30°, and the depth of the straight cavity (3021) is less than one third of the thickness of the insulating sleeve (301).

4. A fluoropolymer explosion-proof constant power series electric heating belt according to claim 3, characterized in that: The side cavity (3022) is in a wave shape that rises and falls, and the height difference between the highest point and the lowest point of the side cavity (3022) is no more than 2 mm.

5. The fluoropolymer explosion-proof constant power series electric heating belt according to claim 1, characterized in that: The reinforcing sheet (303) comprises a metal sheet (3031) arranged inside the straight cavity (3021) and a plurality of arc-shaped sheets (3032) installed on both sides of the metal sheet (3031), and the arc-shaped sheets (3032) are inserted into the inside of the side cavity (3022).

6. A fluoropolymer explosion-proof constant power series electric heating belt according to claim 5, characterized in that: The cross-sectional shape of the metal sheet (3031) is V-shaped, and the side surface of the metal sheet (3031) is in contact with the inner wall of the straight cavity (3021). A plurality of arc-shaped sheets (3032) are distributed at the trough position on the side cavity (3022) and have the same curvature as the trough position.

7. A fluoropolymer explosion-proof constant power series electric heating belt according to claim 6, characterized in that: A metal wire (304) is fused inside the insulating sleeve (301), and the metal wire (304) is embedded in the insulating sleeve (301) in a spring shape.

8. The fluoropolymer explosion-proof constant power series electric heating belt according to claim 5, characterized in that: The material of the metal sheet (3031) and the arc-shaped sheet (3032) includes but is not limited to nickel alloy and copper alloy; The material of the main insulating layer (2) is any one of polyethylene and polyvinyl chloride, and the material of the insulating sleeve (301) is any one of polyurethane, silicone and fluoropolymer.

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