CN114071811A - Armored heating wire - Google Patents

Abstract

Armor heater wire belongs to heater wire connection structure technical field, especially relates to an armor heater wire. The invention provides an armored heating wire with good use effect. The armored heating wire comprises a terminal lead, a terminal lead assembly, an armored heating wire cold section lead, an armored heating wire cold section adapter sleeve and a heating wire, and is characterized in that a connecting part of the terminal lead and the armored heating wire cold section lead is arranged in the terminal lead assembly, and a connecting part of the armored heating wire cold section lead and the heating wire is arranged in the armored heating wire cold section adapter sleeve.

Description

Armored heating wire

Technical Field

The invention belongs to the technical field of heating wire connection structures, and particularly relates to an armored heating wire.

Background

When the armored heating wire is in an electrified heating state, the surface temperature is different from 200 ℃ to 700 ℃ (depending on the meter/power of the armored heating wire), the armored heating wire cannot be directly led into the junction box due to overhigh temperature, and otherwise, the internal temperature of the junction box is overhigh or the insulating layers of other electrical appliances are damaged to cause short-circuit faults. Meanwhile, the high temperature of the exposed heating wire (a certain distance is from the pipeline or the tank body to be heated to the junction box of the armored heating wire, 200MM to 2000MM is unequal, and the armored heating wire is exposed at the distance) can cause burn to surrounding equipment or human bodies. Therefore, there is a need for an adapter having a transition function to transition a heated section to a non-heated section, i.e., a cold section.

Disclosure of Invention

The invention aims at the problems and provides an armored heating wire with good use effect.

In order to achieve the purpose, the armored heating wire comprises a terminal lead, a terminal lead assembly, an armored heating wire cold section lead, an armored heating wire cold section switching sleeve and a heating wire, and is characterized in that a connecting part of the terminal lead and the armored heating wire cold section lead is arranged in the terminal lead assembly, and a connecting part of the armored heating wire cold section lead and the heating wire is arranged in the armored heating wire cold section switching sleeve.

As a preferable scheme, the heating wire comprises a heating core wire, wherein an insulating layer is arranged outside the heating core wire, and a metal sheath is arranged outside the insulating layer.

As another preferable scheme, the heating core wire adopts a nickel-based alloy core wire.

In another preferred embodiment, the insulating layer of the present invention is a magnesium oxide insulating layer.

As another preferred scheme, the metal sheath adopts a seamless stainless steel pipe.

As another preferred scheme, the terminal lead of the invention adopts RV multi-strand annealed copper wires.

Secondly, the terminal lead assembly comprises a copper part, a connecting nut and a tightening nut, wherein the connecting part of the terminal lead and the cold section lead of the armored heating wire is arranged in the copper part, the copper part is arranged in the connecting nut, the outer side of the connecting part is filled with sealant, and the connecting nut is connected with the tightening nut through threads.

In addition, the armored heating wire cold and hot section adapter sleeve comprises a cold and hot section adapter sleeve base and is characterized in that one end of the cold and hot section adapter sleeve base is provided with a cold and hot section adapter sleeve end cover, a cold end lead protection tube penetrates through the cold and hot section adapter sleeve end cover, a cold end lead wire core is arranged on the inner side of the cold end lead protection tube, and the inner end of the cold end lead wire core is arranged in the cold and hot section adapter sleeve base; the heating wire protection pipe penetrates through the cold and hot section adapter sleeve base, a heating wire core is arranged on the inner side of the heating wire protection pipe, and the inner end of the heating wire core is overlapped and butted with the inner end of the cold end lead wire core;

between cold junction lead protection inside pipe wall and the cold junction lead core outer wall, between cold junction lead protection outside pipe wall and the cold and hot section switching cover end cover inner wall, between cold junction lead core outer wall and the cold and hot section switching cover base inner wall, between heating core outer wall and the heating wire protection inside pipe wall, all be provided with the magnesium oxide powder insulating layer between heating wire protection outside pipe wall and the cold and hot section switching cover base inner wall.

The invention has the beneficial effects.

The armored heating wire cold-hot section adapter sleeve is arranged, so that the cold-end lead section of the heating wire can be conveniently connected with the wiring terminal in the junction box, the heating section of the heating wire is prevented from being directly exposed and led into the junction box, the internal temperature of the junction box is overhigh or the insulating layers of other electrical appliances are damaged, short-circuit faults are caused, and meanwhile, the exposed heating wire is prevented from burning surrounding equipment or human bodies due to high temperature (see the schematic diagram of the overall structure of the heating wire in figure 1, and the cold-end lead between the terminal lead component and the cold-hot section adapter sleeve is not heated, so that the effect is achieved).

Drawings

The invention is further described with reference to the following figures and detailed description. The scope of the invention is not limited to the following expressions.

Fig. 1 is a schematic view of the overall structure of a heater wire.

Fig. 2 is a partially enlarged view of fig. 2.

Fig. 3 is a view of a terminal lead structure.

Fig. 4 is a schematic overall structure diagram of the cold-hot section adapter sleeve.

FIG. 5 is a schematic diagram of a first step wire core butt joint.

FIG. 6 is a schematic view of a second step of pressing the base and pouring magnesium oxide powder.

In the third step of fig. 7, the end cap is screwed to the base, and the process is shifted to the next step, schematically illustrated by laser welding.

FIG. 8 is a schematic diagram of an original integrated structure design and wire core butt joint.

FIG. 9 is a schematic view of the original integrated structure, poured with magnesium oxide powder.

FIG. 10 is a schematic view of the original integrated structure design.

Fig. 11 is a schematic diagram of the design of the new split structure.

FIG. 12 is a schematic view before and after crimping.

Detailed Description

As shown in the figure, the armored heating wire cold and hot section adapter sleeve comprises a cold and hot section adapter sleeve base, one end of the cold and hot section adapter sleeve base is provided with a cold and hot section adapter sleeve end cover, a cold end lead protection tube penetrates through the cold and hot section adapter sleeve end cover, a cold end lead wire core is arranged on the inner side of the cold end lead protection tube, and the inner end of the cold end lead wire core is arranged in the cold and hot section adapter sleeve base; the heating wire protection pipe penetrates through the cold and hot section adapter sleeve base, a heating wire core is arranged on the inner side of the heating wire protection pipe, and the inner end of the heating wire core is overlapped and butted with the inner end of the cold end lead wire core;

between cold junction lead protection inside pipe wall and the cold junction lead core outer wall, between cold junction lead protection outside pipe wall and the cold and hot section switching cover end cover inner wall, between cold junction lead core outer wall and the cold and hot section switching cover base inner wall, between heating core outer wall and the heating wire protection inside pipe wall, all be provided with the magnesium oxide powder insulating layer between heating wire protection outside pipe wall and the cold and hot section switching cover base inner wall.

The cold and hot section adapter sleeve of the armored heating wire is of a split structure (the cold and hot section adapter sleeve base and the cold and hot section adapter sleeve end cover), the internal space of the cold and hot section adapter sleeve of the armored heating wire is reasonably enlarged (see the description of the characters in the attached drawings 10 and 11), the space of a magnesium oxide insulating layer is enlarged, and even if a cold end copper lead is slightly deformed in a high-temperature state, the short circuit and leakage faults can not be caused. The butt joint area of the heating wire core and the wire core of the cold end lead can be properly increased, and the reliability of electrical connection is guaranteed.

The cold and hot section switching sleeve of the armored heating wire solves the switching problem of the armored heating wire from the heating section to the cold end lead section.

The armored heating wire cold and hot section adapter sleeve, the terminal lead (capable of adopting RV multi-strand annealed copper wires for connecting a wiring terminal in a wiring box), the terminal lead assembly (capable of adopting a copper piece, a connecting nut and a tightening nut, wherein the copper piece is used for containing sealant, the connecting nut is used for connecting a wire outlet of the wiring box, and the tightening nut is used for fixing a heating wire.

The armored heating wire comprises a heating core wire (a nickel-based alloy core wire can be adopted), an insulating layer (a magnesium oxide insulating layer can be adopted) is arranged on the outer side of the heating core wire, and a metal sheath (a seamless stainless steel pipe can bear the high temperature of 750 ℃, has corrosion resistance and high mechanical strength, is not easy to break, resists low temperature, is not brittle when constructed at low temperature, and is easy to construct and maintain in winter).

The cold-hot section adapter sleeve base and the cold-hot section adapter sleeve end cover are connected into a whole in a mode of thread butt joint and laser welding (as shown in figures 5, 6 and 7). The magnesium oxide insulation layer is connected into a whole in a mode of thread butt joint and laser welding, the inner diameter of a filling cavity of the magnesium oxide insulation layer is not limited by the outer diameters of the armored heating wire and the cold end lead, and the magnesium oxide insulation layer can be designed into a proper inner diameter at will according to needs.

The cold-hot section adapter sleeve base is provided with a magnesium oxide powder filling opening, and magnesium oxide powder is filled from the magnesium oxide powder filling opening to fill the whole inner cavity with the magnesium oxide powder (as shown in figures 5, 6 and 7).

The cold and hot section switching sleeve base end is welded with the outer wall of the cold end lead protection tube, and the cold and hot section switching sleeve base end is welded with the outer wall of the heating wire protection tube.

The vertical position filling magnesia powder filling opening is thick, and the filling efficiency is high (see fig. 10 and 11, the original integrated structure is only provided with a filling opening with the diameter of 3.2 mm on the side surface, and the split structure is filled from the upper end opening of the base of the cold-hot section adapter sleeve, and the diameter of the split structure is 10 mm.

The time is short, the efficiency is improved, the exposure time of the magnesium oxide powder in the air is shortened, the moisture absorption of the magnesium oxide powder is avoided, and the insulating property is improved.

As shown in fig. 12, the clearance between the inner diameter of the transition sleeve of the cold and hot section of the armored heating wire and the outer diameter of the armored heating wire and the cold end lead can be eliminated by crimping the regular hexagonal crimping pliers, and by utilizing the principle that the cylindrical sectional area is reduced after being pressed into a regular hexagon by the regular hexagonal crimping pliers with the same diameter and excircle, a clearance of 0.1 mm is reserved only between the inner diameter of the transition sleeve of the cold and hot section of the armored heating wire and the outer diameter of the cold end lead, and the clearance is changed into tight fit from clearance fit by crimping before welding, so that the fit clearance is eliminated, and conditions are created for the subsequent welding process.

It should be understood that the detailed description of the present invention is only for illustrating the present invention and is not limited by the technical solutions described in the embodiments of the present invention, and those skilled in the art should understand that the present invention can be modified or substituted equally to achieve the same technical effects; as long as the use requirements are met, the method is within the protection scope of the invention.

Claims (8)

1. The armored heating wire comprises a terminal lead, a terminal lead component, an armored heating wire cold section lead, an armored heating wire cold and hot section adapter sleeve and a heating wire, and is characterized in that the terminal lead is arranged in the terminal lead component together with the connecting part of the armored heating wire cold section lead, and the armored heating wire cold section lead and the connecting part of the heating wire are arranged in the armored heating wire cold and hot section adapter sleeve.

2. The sheathed heater wire of claim 1, wherein the heater wire comprises a heating core, an insulating layer on the outside of the heating core, and a metal sheath on the outside of the insulating layer.

3. The sheathed heater wire of claim 2, wherein the heater core is a nickel-based alloy core.

4. The sheathed heater wire of claim 2, wherein the insulation layer is a magnesium oxide insulation layer.

5. The sheathed heater wire of claim 2, wherein the metal sheath is a seamless stainless steel tube.

6. The sheathed heater wire of claim 1, wherein the terminal lead is formed from RV stranded annealed copper wire.

7. The sheathed heater wire of claim 1, wherein the terminal lead assembly comprises a copper member, a connecting nut and a backup nut, wherein a connecting portion of the terminal lead and the cold leg lead of the sheathed heater wire is arranged on the copper member, the copper member is arranged in the connecting nut, a sealant is filled outside the connecting portion, and the connecting nut is connected with the backup nut through a thread.

8. The armored heating wire of claim 1, wherein the cold-hot section adapter sleeve of the armored heating wire comprises a cold-hot section adapter sleeve base, and wherein one end of the cold-hot section adapter sleeve base is provided with a cold-hot section adapter sleeve end cover, a cold-end lead protection tube penetrates through the cold-hot section adapter sleeve end cover, a cold-end lead wire core is arranged at the inner side of the cold-end lead protection tube, and the inner end of the cold-end lead wire core is arranged in the cold-hot section adapter sleeve base; the heating wire protection pipe penetrates through the cold and hot section adapter sleeve base, a heating wire core is arranged on the inner side of the heating wire protection pipe, and the inner end of the heating wire core is overlapped and butted with the inner end of the cold end lead wire core;

between cold junction lead protection inside pipe wall and the cold junction lead core outer wall, between cold junction lead protection outside pipe wall and the cold and hot section switching cover end cover inner wall, between cold junction lead core outer wall and the cold and hot section switching cover base inner wall, between heating core outer wall and the heating wire protection inside pipe wall, all be provided with the magnesium oxide powder insulating layer between heating wire protection outside pipe wall and the cold and hot section switching cover base inner wall.

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