Infrared heating wire capable of changing power

Abstract

An infrared heating wire capable of changing power comprises a carbon fiber core beam, metal winding wires are uniformly and spirally wound on the outer surface of the carbon fiber core beam at equal intervals, an intermediate material layer wraps the outer surfaces of the metal winding wires, outer-layer winding wires are uniformly and spirally wound on the outer surface of the intermediate material layer, and an insulating outer layer wraps the outer surfaces of the outer-layer winding wires. The spiral winding direction of the metal winding wire is opposite to the spiral winding direction of the outer layer winding wire. According to the invention, the defects in the prior art are overcome, and the effect of randomly adjusting the power per unit length of the whole infrared heating wire can be realized. Besides, a plurality of parallel high-strength chemical fibers are arranged on the outer surface of the carbon fiber core bundle, so that the regularity of the whole wire core can be effectively guaranteed, the consistency of the sectional area of the whole wire core can be effectively guaranteed, and the requirement of a production mold is met.

Description

Technical Field

[0001] The invention relates to the technical field of heating wires, and in particular to an infrared heating wire with variable power. Background Art

[0002] Among the existing heating elements, heating wires are widely used in heating products due to their light size. Among the existing heating devices, carbon fiber heating wires are a high-tech product that is different from traditional heating wires such as metal wires and halogens. They have excellent properties such as long service life, high electrothermal conversion efficiency, far infrared radiation, and health and environmental protection. The heating element base material of the heating wire is carbon fiber felt and carbon fiber filament, which has the advantages of large power margin, high temperature resistance, strong high heat capacity, long service life, and power can be adjusted at will. Therefore, it has a wide range of applications in the fields of heating, far infrared health care, baking, heat preservation and moisture-proofing.

[0003] The existing carbon filament fiber heating wire includes a heating conductive wire and an outer insulating jacket, and the heating conductive wire is a plurality of bundles of carbon filament fibers. The insulating jacket is made of polyethylene or polyvinyl chloride, and the insulating jacket is made of fluoroplastic or silicone rubber. However, the length of the existing carbon fiber cable cannot be made longer due to the influence of the resistance value. For example, the market commonly uses 1K carbon fiber precursor, with a resistance of about 290 ohms per meter; 3K carbon fiber precursor, with a resistance of about 145 ohms per meter; 6K carbon fiber precursor, with a resistance of about 70 ohms per meter; 12K carbon fiber precursor, with a resistance of about 35 ohms per meter; 24K carbon fiber precursor, with a resistance of about 17 ohms per meter; Therefore, the existing carbon filament fiber heating wire cannot meet the actual heating needs due to the low power of a single group, so more groups of carbon filament fiber heating wires are required to be connected in parallel, resulting in an excessively large cross-sectional area; the production is difficult, and the insulation cannot be guaranteed, which affects the service life and safety of the product. And because the resistance per meter of the carbon fiber raw yarn is constant, it is impossible to arbitrarily adjust the resistance value per unit length of the carbon fiber core bundle (i.e., the resistance per meter of the carbon fiber core bundle) according to actual needs, and thus it is impossible to arbitrarily adjust the power per unit length of the entire infrared heating line. Summary of the invention

[0004] In view of the shortcomings of the prior art, the present invention provides an infrared heating line with variable power, which overcomes the shortcomings of the prior art and can arbitrarily adjust the resistance of the entire infrared heating line according to the designed resistance value, thereby achieving the effect of arbitrarily adjusting the entire infrared heating line.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0006] A power-changing infrared heating wire comprises a carbon fiber core bundle, the outer surface of the carbon fiber core bundle is uniformly and spirally wound with metal winding wires at equal intervals, the outer surface of the metal winding wires is covered with an intermediate material layer, the outer surface of the intermediate material layer is uniformly and spirally wound with outer layer winding wires, and the outer surface of the outer layer winding wires is covered with an insulating outer layer;

[0007] The spiral winding direction of the metal winding wire is opposite to the spiral winding direction of the outer layer winding wire.

[0008] Preferably, the carbon fiber core bundles are parallel and have metal wire bundles in the middle.

[0009] Preferably, the middle material layer is an NTC material layer, and the outer layer winding is a PTC material layer; the NTC material layer is used to be electrically connected to the control circuit, and the NTC temperature measuring layer is used to detect the temperature information of the PTC material layer and the carbon fiber core bundle, and transmit the temperature information of the carbon fiber core bundle to the control circuit; the PTC material layer is electrically connected to the control circuit, and transmits the temperature information to the control circuit, so as to perform power control through the control circuit, and then control the heating temperature of the carbon fiber core bundle.

[0010] Preferably, the metal winding wire is a round alloy wire structure or a flat alloy wire structure.

[0011] Preferably, the outer layer winding wire is a round alloy wire structure or a flat alloy wire structure.

[0012] Preferably, the outer surfaces of the carbon fiber core bundle are parallel and have high-strength chemical fiber filaments.

[0013] Preferably, the outer surface of the wire core is tightly spirally wound with high-strength chemical fiber windings.

[0014] Preferably, the intermediate material layer is a temperature protection layer, and the material of the intermediate material layer is one of polyvinyl chloride, polyethylene, polytetrafluoroethylene, polypropylene and nylon.

[0015] Preferably, the carbon fiber core bundle includes a plurality of carbon fiber heating wires, and two adjacent carbon fiber heating wires are arranged close to each other and in parallel.

[0016] Preferably, the number of the carbon fiber heating wires is 1K-48K.

[0017] The present invention provides an infrared heating wire with variable power. It has the following beneficial effects: by spirally winding metal winding wires at equal intervals on the outer surface of the carbon fiber core bundle according to actual needs, the resistance value of the core can be adjusted by adjusting the spiral spacing of the metal winding wires according to the resistance value of the core, so as to ensure that the resistance value of the core can be adjusted to any resistance value according to actual needs. Then, the resistance value of the entire infrared heating wire can be adjusted arbitrarily according to the designed resistance value, thereby achieving the effect of arbitrarily adjusting the entire infrared heating wire.

[0018] Moreover, compared with the entire wire core formed entirely of a carbon fiber core bundle, the present invention effectively reduces the cross-sectional area of ​​the entire wire core by winding a low-resistance metal wire on the outer surface of the carbon fiber core bundle, so that under the same resistance value, the cross-sectional area of ​​the infrared heating wire of the present invention can be smaller. This also effectively avoids the problem of increased costs due to the carbon fiber core bundle being too thick, and affecting the use of normal heating products. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the present invention or the technical solutions in the prior art, the drawings required for describing the prior art are briefly introduced below.

[0020] Figure 1 A schematic diagram of the structure of the present invention;

[0021] Figure 2 A schematic diagram of the cross-sectional structure of the present invention;

[0022] Description of the numbers in the figure:

[0023] 1. Carbon fiber core bundle; 2. Metal winding; 3. Intermediate material layer; 4. Outer winding; 5. Insulating outer layer; 6. Chemical fiber yarn; 7. Chemical fiber winding; 8. Metal wire bundle. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solutions and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the present invention.

[0025] Embodiment 1, as Figure 1 to Figure 2 As shown, an infrared heating wire with variable power can be used in heating devices, such as electric blankets, electric quilts, pet blankets, heating boots, local heating products for the human body and other heat preservation and heating products.

[0026] The infrared heating wire comprises a carbon fiber core bundle 1, the outer surface of the carbon fiber core bundle 1 is uniformly and spirally wound with metal winding wires 2 at equal intervals, the outer surface of the metal winding wires 2 is covered with an intermediate material layer 3, the outer surface of the intermediate material layer 3 is uniformly and spirally wound with outer layer winding wires 4, and the outer surface of the outer layer winding wires 4 is covered with an insulating outer layer 5;

[0027] The spiral winding direction of the metal wire 2 is opposite to that of the outer wire 4. By winding the metal wire 2 and the outer wire 4 in opposite directions, the heating wire is given better permeability, and the metal wire 2 and the outer wire 4 form different relatively point-shaped contact areas through two opposite winding methods, so as to offset the influence of external forces to a certain extent and improve the stability of the heating wire.

[0028] In this embodiment, the metal winding wire 2 is spirally wound at equal intervals on the outer surface of the carbon fiber core bundle 1 according to actual needs, so that the resistance value of the core per unit length can be adjusted by adjusting the spiral pitch of the metal winding wire 2 according to the resistance value of the core per unit length, so as to ensure that the resistance value of the core per unit length can be adjusted to any resistance value according to actual needs. Then, the power per unit length of the entire infrared heating line can be adjusted arbitrarily.

[0029] Moreover, compared with the entire wire core formed entirely by using the carbon fiber core bundle 1, the present invention effectively reduces the cross-sectional area of ​​the entire wire core by winding the metal winding wire 2 with a low resistance value on the outer surface of the carbon fiber core bundle 1, so that under the same resistance value, the cross-sectional area of ​​the infrared heating wire of the present invention can be smaller. This also effectively avoids the problem of increased cost and affecting the use of normal heating products due to the carbon fiber core bundle 1 being too thick.

[0030] In addition, in this embodiment, the carbon fiber core bundle 1 includes a plurality of carbon fiber heating wires, and two adjacent carbon fiber heating wires are arranged close together and in parallel. Therefore, when the carbon fiber is heated, it can generate far infrared rays with a wavelength of 2μm-30μm, which will produce the characteristics of resonance phenomenon, and can promote the rise of cell temperature in human skin and subcutaneous tissue, so that the human body can generate heat transfer from the inside to the outside, promote and improve the blood circulation of the human body, and help eliminate human fatigue and restore body functions, enhance metabolism, and improve human immune function.

[0031] Embodiment 2, as a further effective solution of embodiment 1, a metal wire bundle 8 is arranged in parallel in the middle of the carbon fiber core bundle 1. By arranging a plurality of low-resistance metal wire bundles 8 in parallel in the middle of the carbon fiber core bundle 1, the cross-sectional area of ​​the infrared heating wire of the present invention can be smaller under the same resistance value compared with the entire wire core formed by using the carbon fiber core bundle 1 completely. Thus, under the same power condition, the length of the infrared heating wire of the present invention can be longer and can meet the heating needs.

[0032] Embodiment 3, as a further preferred embodiment of embodiment 1, the middle material layer 3 is an NTC material layer, and the outer winding wire 4 is a PTC material layer. The NTC material layer is used to be electrically connected to the control circuit, and the NTC temperature measuring layer is used to detect the temperature information of the PTC material layer and the carbon fiber core bundle 1, and transmit the temperature information of the carbon fiber core bundle 1 to the control circuit; the PTC material layer is electrically connected to the control circuit, and transmits the temperature information to the control circuit, so as to perform power control through the control circuit, and then control the heating temperature of the carbon fiber core bundle 1.

[0033] By using the NTC material layer as the intermediate material layer 3, since the NTC material is a semiconductor resistor with a negative temperature coefficient, its resistance value decreases with the increase of temperature. When the temperature is low, the number of carriers (electrons and holes) in the NTC thermistor is small, resulting in a higher resistance value. As the temperature increases, the number of carriers increases, and the resistance value decreases accordingly. When the temperature of the heating wire is too high, the resistance value of the NTC material layer will drop significantly, thereby changing the current or voltage in the circuit, so that the NTC material layer can show obvious resistance changes when the temperature changes, so that it can be used for temperature measurement and control. And because the NTC material is sensitive to temperature changes, it can quickly reflect temperature changes. And the NTC characteristics can also be used to protect the product from local overheating. The principle of using the NTC characteristics to protect the product from local overheating is to judge whether the voltage drop caused by the large leakage current or voltage generated by the NTC insulating material due to the local high temperature on the sampling resistor reaches the input high level of the control circuit (or single-chip computer or microcontroller).

[0034] By using the PTC material layer as the outer layer winding wire 4, since the PTC material has a positive temperature coefficient characteristic, its resistance value increases with the increase of temperature: this characteristic makes the PTC material layer increase its resistance and reduce its current when the temperature rises, thereby automatically limiting the heating power and preventing the occurrence of overheating. In addition, since the thermal capacity of the PTC heating wire is small, it can quickly reach a stable working state. After power is turned on, the PTC heating wire can heat up quickly. And since the resistance value of the PTC material mainly depends on its heating temperature, it is less affected by the fluctuation of the power supply voltage. Therefore, when using different power supply voltages, as long as the applied voltage can provide enough heat for the PTC element to reach the Curie point temperature and show the PTC characteristics, it will not have a significant impact on the operating temperature of the element. This characteristic enables the PTC heating wire to maintain a stable detection and control effect even in an environment with unstable power supply voltage. Specifically, when the temperature of the PTC material layer increases, the resistance of the PTC material layer increases, and the sampling voltage of the PTC material layer decreases. When it is lower than the set reference voltage or current, the control circuit stops outputting the trigger pulse after detecting the low potential, and then the resistance of the PTC material layer slowly decreases, and the sampling voltage of the PTC material layer increases. When the sampling voltage increases, the control circuit detects a high potential, outputs a trigger pulse, and resumes output. The control circuit cuts off the output as the resistance of the PTC heating layer increases, and heats up when the resistance decreases, so as to achieve the purpose of constant temperature control through cyclic control.

[0035] Embodiment 4, as a further preferred embodiment of embodiment 1, the metal winding wire 2 is a round alloy wire structure or a flat alloy wire structure. In this embodiment, it is preferred to adopt a flat alloy wire structure so that the surface area of ​​the metal winding wire 2 becomes larger, so that the metal winding wire 2 can provide a higher power density in a smaller volume, and the mechanical strength of the metal winding wire 2 is further increased.

[0036] Embodiment 5, as a further preferred embodiment of embodiment 1, the outer layer winding wire 4 is a round alloy wire structure or a flat alloy wire structure. In this embodiment, it is preferred to adopt a flat alloy wire structure, so that the heating area of ​​the outer layer winding wire 4 is increased, and the mechanical strength and roundness of the outer layer winding wire 4 are further increased, and the outer layer winding wire 4 can be more tightly wound on the outer surface of the intermediate material layer 3.

[0037] Embodiment 6, as a further preferred embodiment of embodiment 1, the outer surface of the carbon fiber core bundle 1 is parallel and has high-strength chemical fiber filaments 6. Specifically, the high-strength chemical fiber filaments 6 can be aramid filaments, polyester filaments, etc., and multiple high-strength chemical fiber filaments 6 are arranged parallel and close together on the outer surface of the carbon fiber core bundle 1, so that the regularity of the entire wire core can be effectively guaranteed, and the consistency of the cross-sectional area of ​​the entire wire core can also be effectively guaranteed, so that it meets the production mold requirements.

[0038] Embodiment 7, as a further preferred embodiment of embodiment 1, the outer surface of the core is tightly spirally wound with a high-strength chemical fiber winding 7. Specifically, the high-strength chemical fiber winding can be made of aramid filament fiber, polyester yarn, etc., and the tightness and roundness of the entire core can be effectively improved by winding the high-strength chemical fiber winding 7.

[0039] Embodiment 8, as a further preferred embodiment of embodiment 1, the intermediate material layer 3 is a temperature protection layer, and the material of the intermediate material layer 3 is one of polyvinyl chloride, polyethylene, polytetrafluoroethylene, polypropylene, and nylon. By using the temperature protection layer as the intermediate material layer 3, the entire infrared heating line can work as a protection line. When the temperature of the carbon fiber core bundle 1 of the infrared heating line is too high, the intermediate material layer 3 will melt due to the high temperature, causing the outer layer winding 4 wound on the outer surface of the intermediate material layer 3 to contact the metal winding 2 in the intermediate material layer 3, which will then cause the external current and voltage to increase, and then the external temperature fuse will be melted, thereby achieving short circuit protection.

[0040] Embodiment 9, as a further preferred embodiment of embodiment 1, the number of carbon fiber heating wires is 1K-48K. The number of carbon fiber heating wires can change the resistance of the carbon fiber heating body. The more the number of carbon fiber heating wires, the smaller the resistance of the carbon fiber heating body.

[0041] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An infrared heating wire with variable power, characterized in that: A carbon fiber core bundle (1), wherein the outer surface of the carbon fiber core bundle (1) is uniformly and spirally wound with metal winding wires (2) at equal intervals, the outer surface of the metal winding wires (2) is covered with an intermediate material layer (3), the outer surface of the intermediate material layer (3) is uniformly and spirally wound with outer layer winding wires (4), and the outer surface of the outer layer winding wires (4) is covered with an insulating outer layer (5); The spiral winding direction of the metal winding wire (2) is opposite to the spiral winding direction of the outer layer winding wire (4).

2. The infrared heating wire with variable power according to claim 1, characterized in that: The carbon fiber core bundle (1) is parallel and has a metal wire bundle (8) in the middle.

3. The infrared heating wire with variable power according to claim 1, characterized in that: The intermediate material layer (3) is an NTC material layer, and the outer layer of winding wire (4) is a PTC material layer; the NTC material layer is used to be electrically connected to a control circuit, and the NTC material layer is used to detect temperature information of the carbon fiber core bundle (1), and to protect against local overheating by judging that a large leakage current or voltage is formed in the NTC material layer due to local high temperature; the PTC material layer is electrically connected to the control circuit, and transmits temperature information to the control circuit, so as to perform power control through the control circuit, and then control the heating temperature of the carbon fiber core bundle (1).

4. The infrared heating wire with variable power according to claim 1, characterized in that: The metal winding wire (2) is a round alloy wire structure or a flat alloy wire structure.

5. The infrared heating wire with variable power according to claim 1, characterized in that: The outer layer winding wire (4) is a round alloy wire structure or a flat alloy wire structure.

6. The infrared heating wire with variable power according to claim 1, characterized in that: The outer surface of the carbon fiber core bundle (1) is parallel and has high-strength chemical fiber filaments (6).

7. The infrared heating wire with variable power according to claim 1, characterized in that: The outer surface of the wire core is tightly and spirally wound with high-strength chemical fiber windings (7).

8. The infrared heating wire with variable power according to claim 1, characterized in that: The intermediate material layer (3) is a temperature protection layer, and the material of the intermediate material layer (3) is one of polyvinyl chloride, polyethylene, polytetrafluoroethylene, polypropylene, and nylon.

9. The infrared heating wire with variable power according to claim 1, characterized in that: The carbon fiber core bundle (1) comprises a plurality of carbon fiber heating wires, and two adjacent carbon fiber heating wires are arranged close together and in parallel.

10. The infrared heating wire with variable power according to claim 7, characterized in that: The number of the carbon fiber heating wires is 1K-48K.

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