Heating wire winding core, heating wire, electrical appliance and heating wire winding core preparation process

Abstract

The present application relates to the field of electrical appliance technology, and provides a heating wire winding core, a heating wire, an electrical appliance, and a heating wire winding core preparation process, wherein the heating wire winding core comprises at least a first fiber and a second fiber, the first fiber and the second fiber are mixed, the first fiber is a high-silica glass fiber; the second fiber is an alkali-free glass fiber or a medium-alkali glass fiber. The present application uses high-temperature resistant high-silica glass fiber, whose melting point is higher than that of the heating wire. Since the high-silica glass fiber will not melt, the melted alkali-free glass fiber will be tightly attached to the high-silica glass fiber, and the rope body used to support the heating wire will not be extended due to gravity, so the heating wire will not be softened by high temperature and extend.

Description

Technical Field

[0001] The present invention relates to the technical field of electrical appliances, and in particular to an electric heating wire winding core for an electric heating device, an electric heating wire, an electrical appliance, and a preparation process of the electric heating wire winding core. Background Art

[0002] In the prior art, solid braided fiberglass ropes are generally used as heating wire carriers for electric heating appliances such as hair dryers and hot air guns. The solid braided ropes are generally woven from alkali-free glass fiber yarns.

[0003] Since the temperature resistance of alkali-free glass fiber is generally around 600℃, once the heating wire is powered on, if the temperature control limit is not effective in time, the heating wire will quickly heat up to over 700℃ or higher, which will easily cause the alkali-free glass fiber to melt into a fluid and shift, resulting in the rope body and the heating wire being extended or even broken. In the prior art, the use of solid braided ropes of alkali-free glass fibers cannot achieve the original intention of increasing safety as a heating wire winding carrier.

[0004] In addition, since the alkali-free glass fiber needs to be coated with a certain amount of wetting agent during the drawing process, the main component of the wetting agent is organic matter that is not resistant to high temperatures, such as paraffin, silane, modified starch, etc., and since the wetting agent and other flammable substances are not effectively removed during the processing of the alkali-free glass fiber solid braided rope and the subsequent heating wire winding, when the wound heating wire is installed on the electrical equipment and the power is turned on, flames will appear and even burn surrounding parts, which will have an extremely adverse psychological impact on users, and thus affect product sales and company image. Summary of the invention

[0005] In order to solve the technical problems existing in the electric heating wire winding core of the prior art, the main purpose of the present application is to provide an electric heating wire winding core, an electric heating wire, an electrical appliance and an electric heating wire winding core preparation process that can withstand high temperatures.

[0006] The present application provides a heating wire winding core, which at least includes a first fiber and a second fiber, the first fiber and the second fiber are mixed, the first fiber is a high-silica glass fiber; the second fiber is an alkali-free glass fiber or a medium-alkali glass fiber.

[0007] According to an embodiment of the present application, the heating wire winding core includes a core rope and a surface layer wrapped around the core rope, and the core rope includes a rope made of a first fiber and a second fiber.

[0008] According to an embodiment of the present application, the surface layer includes tightly woven second fibers.

[0009] According to an embodiment of the present application, the surface layer includes tightly woven first fibers and second fibers.

[0010] On the other hand, the present application provides an electric heating wire, comprising an electric heating wire and a winding core, wherein the electric heating wire is spirally wound around the winding core, and the winding core is the electric heating wire winding core as described above.

[0011] In another aspect of the present application, an electrical appliance is provided, comprising the heating wire as described above.

[0012] In another aspect, the present application provides a process for preparing a heating wire winding core, comprising the steps of:

[0013] Equipped with high silica fiberglass rope;

[0014] Configure alkali-free glass fiber or medium-alkali glass fiber as the main fiber;

[0015] High silica glass fiber rope is mixed with main fiber to form a solid rope;

[0016] The product is shaped through high temperature dewaxing and fume exhaust process.

[0017] According to an embodiment of the present application, the hybrid process includes:

[0018] First, the main fiber and high-silica glass fiber rope are mixed into the core;

[0019] The yarn made of the main fiber is tightly woven on the outer layer.

[0020] According to an embodiment of the present application, the high-temperature dewaxing and fume exhaust process includes:

[0021] The braided electric heating wire winding core is pulled into the glass fiber dewaxing furnace. After about 20-30 minutes of heat treatment at a temperature of 300-400°C, it is led out and reeled.

[0022] The heating wire winding core of the embodiment of the present application is adopted. The winding core of the embodiment of the present application adopts high-temperature resistant high-silica glass fiber and ordinary glass fiber to be mixed. Since the melting point of high-silica glass fiber is higher than that of the heating wire, the high-silica glass fiber will not melt when overheating occurs. At the same time, the melted alkali-free glass fiber can be closely attached to the high-silica glass fiber. The rope body used to support the heating wire will not be extended due to gravity, so the heating wire will not be softened by high temperature and extended. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 : Schematic diagram of the heating wire winding core structure in the embodiment of the present application.

[0024] Figure 2 : Schematic diagram of the heating wire structure in the embodiment of the present application.

[0025] Core rope 1; surface layer 2; first fiber 10; second fiber 20;

[0026] Electric heating wire 200; winding core 100. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] Heating wire winding embodiment

[0029] In order to solve the common technical problems of the prior art heating wire winding core, the embodiment of the present application provides a heating wire winding core, which includes at least a first fiber and a second fiber, and the first fiber and the second fiber are mixed. The first fiber is high-silica glass fiber; the second fiber is alkali-free glass fiber or medium-alkali glass fiber.

[0030] In the embodiment of the present application, high silica glass fiber can be integrally mixed with alkali-free glass fiber or medium alkali glass fiber to form a winding core, or high silica glass fiber rope can be first mixed into a rope core and then alkali-free glass fiber or medium alkali glass fiber yarn is braided on the periphery. Both methods can be implemented. After being made, a high-temperature dewaxing and smoke exhaust process is selected for finalization, thereby eliminating the problem of smoke during use, which directly improves the customer experience.

[0031] The winding core of the embodiment of the present application is mixed with high-temperature resistant high-silica glass fiber and ordinary glass fiber. Since the melting point of high-silica glass fiber is higher than that of the heating wire, the high-silica glass fiber will not melt when overheated, and the melted alkali-free glass fiber can be closely attached to the high-silica glass fiber. The rope body used to support the heating wire will not be extended due to gravity, so the heating wire will not be softened by high temperature and extended.

[0032] Compared with the winding core made of high-silica glass fiber as a whole, the winding core in the embodiment of the present application only uses a small proportion of high-silica glass fiber as support, so the production cost of the winding core can be effectively controlled. At the same time, there are fewer changes in the manufacturing process, and the process cost will not be increased.

[0033] The glass fiber described in the embodiments of the present application is an inorganic non-metallic material with excellent performance. Its original English name is glass fiber or fiberglass. Its ingredients are silicon dioxide, aluminum oxide, calcium oxide, boron oxide, magnesium oxide, sodium oxide, etc. It is made of glass balls or waste glass as raw materials and is processed through high-temperature melting, wire drawing, winding, weaving and other processes. Finally, various products are formed. The diameter of the glass fiber monofilament ranges from a few microns to more than 20 microns, which is equivalent to 1 / 20-1 / 5 of a hair. Each bundle of fiber strands is composed of hundreds or even thousands of monofilaments.

[0034] The high-silica glass fiber in the embodiment of the present application is the abbreviation of high-purity silicon oxide amorphous continuous fiber, with a silicon oxide content of 96-98%, a continuous temperature resistance of 1000 degrees Celsius, a short temperature resistance of 1400 degrees Celsius, a softening point of 1450 degrees Celsius, and a melting point of 1700 degrees Celsius, which is much higher than the melting point of the heating wire. The temperature resistance of nickel-chromium heating wire or iron-chromium heating wire is between 1300-1400 degrees Celsius; the single fiber diameter of high-silica glass fiber is greater than 5 microns, does not contain any asbestos or ceramic wool, and is completely harmless to health. In the embodiment of the present application, after actual product verification, the proportion of high-silica glass fiber used is controlled between 15% and 20% (by volume), which can provide effective support for the winding core and the heating wire, and can effectively avoid damage to the heating wire.

[0035] The medium-alkali glass fiber (C-glass) described in the embodiment of the present application has a monovalent element oxide R2O content of 11.9%-12.4%, and is a sodium-calcium silicate component. Due to its high alkali content, it cannot be used as an electrical insulating material, but its chemical stability and strength are good. When the medium-alkali glass fiber is drawn into glass fiber raw yarn, a textile type (paraffin emulsion) sizing agent is used, and its content is not more than 2.2%.

[0036] The alkali-free glass fiber (E-glass) described in the embodiments of the present application, also known as E glass fiber, refers to glass fiber with a low content of alkali metal oxides. The specific content of alkali metal oxides is currently stipulated to be no more than 0.8% in China and generally about 1% abroad.

[0037] like Figure 1 As shown, an exemplary description is given below in combination with an embodiment of the present application. In the embodiment, the electric heating wire winding core includes a core rope 1 and a surface layer 2 wrapped outside the core rope, and the core rope includes a rope made of a mixed braided first fiber 10 and a second fiber 20. The first fiber 10 is selected as high-silica glass fiber, and the second fiber 20 is selected as alkali-free glass fiber (E-glass) or medium-alkali glass fiber (C-glass).

[0038] In this specific embodiment, the high-silica glass fiber is made of a ternary system glass (Na2O-B2O3-SiO2), specifically, glass containing 60-70% SiO2, 20-25% B2O3, and 5-10% Na2O is melted at 1450 degrees Celsius, and drawn at 1150 degrees Celsius to form the glass fiber. In this embodiment, the high-silica glass fiber with a ternary system glass formula of SiO2-67%, Na2O-23%, and B2O3--10% is selected, and the softening point is close to 1700°C, and it can be used for a long time at 1000°C; the following table shows the main technical indicators of the material:

[0039]

[0040] In the embodiment, the outer diameter of the heating wire winding core is 1.9mm±0.05mm, wherein the outer diameter of the mixed high-silica glass fiber solid rope in the core rope 1 is selected to be 0.75-0.85mm. The proportion of high-silica glass fiber in the winding core is 15% to 20%. After multiple high-temperature aging tests of the product, it is proved that it can provide effective support for the winding core and the heating wire, and can effectively prevent damage to the heating wire.

[0041] It should be understood that the outer diameter size (or usage ratio) of the high silica glass fiber solid rope in the embodiment can be selected within a range according to the temperature resistance, so as to ensure the effective support effect and avoid the cost increase as much as possible.

[0042] The core rope 1 in the embodiment can be made of low-twist glass fiber rope with a temperature resistance of 600°C. For high requirements on electrical insulation performance, alkali-free glass fiber can be used, and for general requirements on electrical insulation performance, medium-alkali glass fiber can be used. The corresponding glass fiber core is used according to different outer diameters.

[0043] The surface layer 2 in the embodiment can be woven with 600°C alkali-free glass fiber E-glass, and the yarn number is determined according to the outer diameter of the solid rope. The high-silica glass fiber is used to strengthen the solid rope after high temperature to prevent the glass fiber heating line from extending due to gravity after high temperature, so high-silica glass fiber with a temperature resistance of more than 1000°C is used.

[0044] According to a specific embodiment of the present application, the surface layer 2 is made of alkali-free glass fiber or medium-alkali glass fiber tightly woven together. Of course, it can also be made of high-silica glass fiber mixed with it.

[0045] In another embodiment, the high-silica glass fiber can also be made of high-silica glass fiber prepared by the Belarus binary system, and the SiO2 content of the raw yarn is as high as more than 70%, and the Na2O content is between 20-26%.

[0046] like Figure 2As shown, on the other hand, the present application provides an electric heating wire, including an electric heating wire 200 and a winding core 100, wherein the electric heating wire 200 is spirally wound around the winding core 100, and the winding core 100 is the electric heating wire winding core as described above.

[0047] Since the high-silica glass fiber will not melt, the melted alkali-free glass fiber will be tightly attached to the high-silica glass fiber, and the rope body used to support the heating wire will not be extended due to gravity, so the heating wire will not be softened and extended due to high temperature.

[0048] The main body of the alkali-free glass fiber twisted rope is added with a high-silica rope as the core, and the alkali-free glass fiber yarn is tightly woven on the outer layer (the alkali-free glass fiber yarn can also be used as the main body and mixed with the high-silica rope to weave) to become a solid rope with a smooth surface and uniform thickness. It is then shaped after high-temperature dewaxing and smoke exhaust to become a high-silica reinforced and low-smoke glass fiber solid braided rope.

[0049] Because high-silica fiber can maintain good strength and elasticity for a long time at 1000 degrees Celsius, it has low thermal conductivity, good resistance to high thermal shock, is inert to most chemicals, and has good corrosion resistance to high-temperature compounds, corrosive minerals, and weakly alkaline molten alloys, which can ensure that the heating wire can work normally and continuously under high heat and strong radiation conditions.

[0050] Preparation process example

[0051] In another aspect, the present application provides a process for preparing a heating wire winding core, comprising the steps of:

[0052] Configure high silica glass fiber rope; the high silica glass fiber rope is selected to have a continuous temperature resistance of 1000 degrees Celsius, a short-term temperature resistance of 1400 degrees Celsius, a softening point of 1450℃, and a melting point of 1700℃.

[0053] Configure alkali-free glass fiber or medium-alkali glass fiber as the main fiber;

[0054] The high-silica glass fiber rope is mixed with the main fiber to form a solid rope; the proportion of high-silica glass fiber is controlled between 15% and 20% (by volume), which can provide effective support for the winding core and the heating wire, and can effectively avoid damage to the heating wire.

[0055] The product is shaped through high temperature dewaxing and fume exhaust process.

[0056] According to an embodiment of the present application, the hybrid process includes:

[0057] First, the main fiber and high-silica glass fiber rope are mixed into the core;

[0058] The yarn made of the main fiber is tightly woven on the outer layer.

[0059] According to an embodiment of the present application, the high-temperature dewaxing and fume exhaust process includes:

[0060] The braided electric heating wire winding core is pulled into the glass fiber dewaxing furnace. After about 20-30 minutes of heat treatment at a temperature of 300-400°C, it is led out and reeled.

[0061] After the low-smoke glass fiber braided solid rope is woven, it needs to be dewaxed. During the drawing process, the glass fiber needs to be coated with an appropriate amount of impregnation agent to cool and form in order to facilitate subsequent weaving. The impregnation agent is usually paraffin, silane, starch and other organic substances, which are flammable at low temperatures. It begins to volatilize into smoke at more than 200°C, and direct heating too high will produce open flames. In order to reduce the adverse effects of the impregnation agent on subsequent use, it is necessary to discharge the organic flammable materials through smoke without generating open flames. At the same time, the toughness and strength of the braided solid rope after smoke exhaust must be ensured. Usually, the braided glass fiber rope is pulled into the glass fiber dewaxing furnace, and after about 20 minutes of heat treatment at 300-400°C, it is drawn out and reeled. After dewaxing, the glass fiber braided solid rope changes from white to grayish yellow.

[0062] In order to solve the above two major problems of alkali-free glass fiber solid braided rope, we have invented a high-silica reinforced low-smoke glass fiber solid braided rope after repeated research and practice. Customer trials have shown that after the heating wire is powered on, the glass fiber solid braided rope and the heating wire have no elongation or deformation, no open flame occurs, and smoke volatilization is reduced by more than 80%.

[0063] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. 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. A heating wire winding core, characterized in that: The heating wire winding core comprises a core rope and a surface layer wrapped around the core rope; The core rope comprises a high-silica glass fiber rope made of a first fiber and a main body fiber made of a second fiber; the high-silica glass fiber rope and the main body fiber are mixed to form a solid rope; wherein the high-silica glass fiber rope accounts for 15% to 20% of the volume of the solid rope; the first fiber is a high-silica glass fiber with a continuous temperature resistance of more than 1000°C and a short-term temperature resistance of 1400°C; The surface layer is made of the first fiber, or is made of a mixture of the first fiber and the second fiber; Wherein, the first fiber is high-silica glass fiber; the second fiber is alkali-free glass fiber or medium-alkali glass fiber; The heating wire winding core is shaped after being treated by a high-temperature dewaxing and fume exhaust process; wherein the heating temperature range of the high-temperature dewaxing and fume exhaust process is 300-400°C; When the second fiber is overheated and melted, it will be tightly attached to the first fiber.

2. The heating wire winding core according to claim 1, characterized in that: The silica content of the first fibers is between 96-98%.

3. A heating wire, characterized in that: It comprises an electric heating wire and a winding core, wherein the electric heating wire is spirally wound around the winding core, and the winding core is the electric heating wire winding core as described in any one of claims 1-2.

4. An electrical appliance, characterized in that: Comprising the heating wire as claimed in claim 3.

5. A process for preparing a heating wire winding core as claimed in claim 1 or 2, characterized in that: Includes steps: Equipped with high silica fiberglass rope; Configure alkali-free glass fiber or medium-alkali glass fiber as the main fiber; The high-silica glass fiber rope is mixed with the main fiber to form a solid rope; wherein the high-silica glass fiber rope accounts for 15% to 20% of the volume of the solid rope; The outer braided surface layer of the solid rope forms a heating wire winding core; wherein the surface layer is made of the first fiber, or the first fiber and the second fiber are mixed and woven; the first fiber is a high-silica glass fiber with a continuous temperature resistance of more than 1000°C and a short-term temperature resistance of 1400°C; The heating wire winding core is subjected to a high-temperature dewaxing and fume exhaust process. The heating temperature range of the high-temperature dewaxing and fume exhaust process is 300-400°C.

6. The process for preparing the heating wire winding core according to claim 5, characterized in that: The high-temperature dewaxing and fume exhaust process comprises: The braided electric heating wire winding core is pulled into the glass fiber dewaxing furnace. After about 20-30 minutes of heat treatment at a temperature of 300-400°C, it is led out and reeled.

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