CN113840407B - A high temperature resistant insulation type AHT armored electric heating cable - Google Patents

Abstract

The invention relates to a high-temperature-resistant insulating AHT armored electric tracing band, which comprises an electric tracing band body, wherein the electric tracing band body comprises a first metal wire and a second metal wire, the outer sides of the first metal wire and the second metal wire are sleeved with a conductive plastic layer, the conductive plastic layer is made of PCT (polyethylene terephthalate) plastic, the conductive plastic layer isolates the first metal wire from the second metal wire, and an insulating layer is arranged on the outer side of the conductive plastic layer; the outer side of the insulating layer is provided with a reticular metal wire layer, the outer side of the reticular metal wire layer is sleeved with a sheath layer, and one side of the sheath layer is provided with a plurality of gaps along the length direction; a heat-insulating heat-conducting layer is arranged between the metal wire layer and the sheath layer, the heat-insulating heat-conducting layer comprises a heat-insulating sheet and a heat-conducting sheet, one end of the heat-insulating sheet is connected with one end of the heat-conducting sheet, the other end of the heat-insulating sheet is connected with the other end of the heat-conducting sheet, the heat-conducting sheet corresponds to one side of the protective sleeve, which is provided with a notch, and the heat-insulating sheet corresponds to the other side of the protective sleeve. The electric tracing band has good high temperature resistance and saves energy.

Description

A high temperature resistant insulation type AHT armored electric heating cable

Technical Field

The invention belongs to the technical field of electric heating tapes, and in particular relates to a high temperature resistant insulating AHT armored electric heating tape.

Background technique

The electric heating cable is composed of a conductive polymer and two parallel metal wires and an insulating sheath. Its characteristics are that the conductive polymer has a very high positive temperature coefficient characteristic, and is connected in parallel with each other, and can automatically adjust the output power with the temperature change of the heated system, automatically limit the heating temperature, can be arbitrarily shortened or extended within a certain range, and allows multiple cross-overlapping without the worry of high-temperature hot spots and burning.

Existing electric heating cables are generally installed close to pipes or other insulating substrates. During use, only one side of the heating cable exchanges heat with the pipe or other insulating substrate, while the other side radiates heat to the outside and hardly exchanges heat with the pipe or other insulating substrate, resulting in energy waste. People have been studying how to solve this problem.

Summary of the invention

In view of the problems existing in the above-mentioned prior art, the present invention provides a high-temperature resistant insulating AHT armored electric heating tape to solve the above-mentioned technical problems.

In order to achieve the above-mentioned object of the invention, a technical solution provided by the present invention is as follows:

A high temperature resistant insulated AHT armored electric heating tape comprises an electric heating tape body, the electric heating tape body comprises a first metal wire and a second metal wire, a conductive plastic layer is sheathed on the outside of the first metal wire and the second metal wire, the conductive plastic layer is made of PCT plastic, the conductive plastic layer isolates the first metal wire and the second metal wire, an insulating layer is arranged on the outside of the conductive plastic layer; a mesh metal wire layer is arranged on the outside of the insulating layer, a sheath layer is sheathed on the outside of the mesh metal wire layer, and a plurality of notches are arranged on one side of the sheath layer along the length direction; a thermal insulation and heat conduction layer is arranged between the metal wire layer and the sheath layer, the thermal insulation and heat conduction layer comprises a thermal insulation sheet and a thermal conduction sheet, one end of the thermal insulation sheet is connected to one end of the thermal conduction sheet, the other end of the thermal insulation sheet is connected to the other end of the thermal conduction sheet, the thermal conduction sheet is arranged corresponding to the side of the sheath layer provided with the notch, and the thermal insulation sheet is arranged corresponding to the other side of the sheath layer.

Preferably, an isolation strip is formed between adjacent notches, and the relationship between the length of the notch and the width of the isolation strip satisfies the following formula:

L≥15M

Wherein, L is the length of the gap and M is the width of the isolation strip.

Preferably, the insulating layer is made of one or more materials selected from the group consisting of modified polyolefin, flame-retardant polyolefin, fluorinated polyolefin and perfluorinated material.

Preferably, the sheath layer is made of one or more of modified polyolefin, flame-retardant polyolefin and perfluorinated material.

Preferably, a fixing piece is detachably connected to the main body of the electric heating tape, and the fixing piece includes a first fixing piece and a second fixing piece; first fixing parts are provided on both sides of the first fixing piece, a first fixing hole is provided on the first fixing part, a first groove is provided on the first fixing piece at a position between the first fixing holes on both sides, and a fixing groove is provided in the first groove; second fixing parts are provided on both sides of the second fixing piece, a second fixing hole is provided on the second fixing part, and a second groove is provided on the second fixing piece at a position between the second fixing holes on both sides; the first fixing piece and the second fixing piece can be fixed as a whole through the first fixing holes and the second fixing holes on both sides, and in this state, the first groove and the second groove form a through hole; a metal wire connector is provided in the through hole, and the metal wire connector includes an outer frame, a partition is provided in the outer frame, and wiring pieces are fixed on both sides of the partition; the wiring piece includes two symmetrically arranged conductive sheets, the shape of the conductive sheets is a major arc, and the two ends of the two conductive sheets The corresponding connections form two interconnected spaces inside the connector; a plurality of spring sheets are circumferentially arranged on the conductive sheet, the spring sheet includes a connecting section and a fixing section, one end of the connecting section is connected to the conductive sheet, and the other end is connected to the fixing section; the connecting section and the fixing section are both inclined relative to the conductive sheet, the distance from one end of the spring sheet connected to the conductive sheet to the arc center of the conductive sheet is greater than the distance from the other end to the arc center of the conductive sheet, and the angle of the connecting section relative to the plane where the conductive sheet is located is smaller than the angle of the fixing section relative to the plane where the conductive sheet is located; in each of the wiring members, the heights of the spring sheets on the two conductive sheets are different; a cover plate is arranged at one end of the outer frame, and the connectors on the cover plate corresponding to the two sides of the partition are provided with connecting holes, the shape of the connecting holes is the same as the shape of the connecting members, so that the connecting holes form two symmetrical arc-shaped threaded holes, screws are threadedly connected to the threaded holes, and the height difference of the conductive sheet is greater than the thickness of the screws; a fixing block matching the fixing groove is arranged on the outer frame.

Preferably, the screw is a machine screw.

Preferably, the outer frame and the partition are made of insulating material or made of metal material with an insulating layer provided on the rear surface; the conductive sheet and the spring are made of conductive material.

Preferably, the conductive sheet and the spring sheet are made of metal material.

The high temperature resistant insulating AHT armored electric heating tape provided by the present invention has the following advantages:

1. A mesh metal wire layer and a sheath layer are arranged outside the insulation layer, which increases the strength of the electric heating cable. The metal wire mesh can shield the interference of signals and magnetic fields, and prevent the heating cable from interfering with external signals and magnetic fields during operation. The insulation layer and the sheath layer are made of improved polyolefin, which has good high temperature resistance.

2. A heat-insulating and heat-conducting layer is arranged between the metal wire layer and the sheath layer. When in use, one side of the heat-conducting sheet contacts the pipe or other heat-insulating substrate. In this way, the heat dissipated from the side of the heating belt that is not in contact with the pipe or other heat-insulating substrate is greatly reduced. The heat exchange between the heating belt and the outside world is mainly concentrated on the pipe or other heat-insulating substrate, saving energy.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic diagram of the structure of a high temperature resistant insulating AHT armored electric heating cable according to the present invention;

Fig. 2 is a schematic diagram of the A-A cross-sectional structure of Fig. 1;

FIG3 is a schematic diagram of the structure of a high temperature resistant insulating AHT armored electric heating cable according to the present invention;

FIG4 is a schematic cross-sectional view of the fixing member in FIG3 ;

FIG5 is a schematic cross-sectional view of the first fixing member;

FIG6 is a schematic cross-sectional view of the second fixing member;

FIG7 is a schematic diagram of a cross-sectional structure of a metal conductive connector;

FIG8 is a top view of a metal conductive connector;

Fig. 9 is a schematic diagram of the cross-sectional structure taken along line B-B of Fig. 8;

FIG10 is a schematic diagram of the structure of FIG8 without screws;

Reference numerals in the figure: first metal conductor 1, second metal conductor 2, conductive plastic layer 3, insulating layer 4, mesh metal wire layer 5, sheath layer 6, electric heating tape body 7, fixing part 8, thermal insulation and heat conductive layer 9, thermal insulation sheet 91, thermal conductive sheet 92, first fixing part 10, second fixing part 11, first fixing portion 12, first fixing hole 13, first groove 14, second fixing portion 15, second fixing hole 16, second groove 17, fixing groove 18, outer frame 19, partition 20, conductive sheet 21, spring sheet 22, connecting section 23, fixing section 24, cover plate 25, screw 26, threaded hole 27, fixing block 29, notch 30, isolation strip 31.

Detailed ways

In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

Embodiment 1, the present invention provides a high temperature resistant insulated AHT armored electric heating tape, see Figure 1 and Figure 2, including an electric heating tape body, the electric heating tape body including a first metal wire 1 and a second metal wire 2, in this embodiment, the first metal wire and the second metal wire are copper wires, and a conductive plastic layer 3 is sheathed on the outside of the first metal wire and the second metal wire. In this embodiment, the conductive plastic layer is preferably made of PCT plastic (also known as PTC conductive plastic). The first metal wire and the second metal wire are located at both ends of the conductive plastic layer during manufacturing, so that the middle part of the conductive plastic layer isolates the first metal wire and the second metal wire, and an insulating layer 4 is arranged on the outside of the conductive plastic layer; a mesh metal wire layer 5 is arranged on the outside of the insulating layer, and a sheath layer 6 is sheathed on the outside of the mesh metal wire layer, wherein the insulating layer is generally modified polyolefin, flame retardant polyolefin, containing The mesh metal wire layer can generally use aluminum-magnesium alloy wire or tinned copper wire with a coverage density of 80%. The sheath layer is generally made of one or more of modified polyolefin, flame-retardant polyolefin and perfluorinated material; a plurality of notches 30 are arranged on one side of the sheath layer along the length direction; a thermal insulation and heat-conducting layer 9 is arranged between the metal wire layer and the sheath layer, and the thermal insulation and heat-conducting layer includes a thermal insulation sheet 91 and a thermal conductive sheet 92. The thermal insulation sheet is made of a material with good thermal insulation performance, such as aerogel nano thermal insulation material, thermal insulation cotton or sponge, and the thermal conductive sheet is made of a thermal conductive material, such as a thermal conductive silicone sheet; one end of the thermal insulation sheet is connected to one end of the thermal conductive sheet, and the other end of the thermal insulation sheet is connected to the other end of the thermal conductive sheet. The thermal conductive sheet is arranged corresponding to the side of the sheath layer with the notch, and the thermal insulation sheet is arranged corresponding to the other side of the sheath layer.

The above-mentioned high temperature resistant insulation type AHT armored electric heating cable has the following advantages:

1. A mesh metal wire layer and a sheath layer are arranged outside the insulation layer, which increases the strength of the electric heating cable. The metal wire mesh can shield the interference of signals and magnetic fields, and prevent the heating cable from interfering with external signals and magnetic fields during operation. The insulation layer and the sheath layer are made of improved polyolefin, which has good high temperature resistance.

2. A heat-insulating and heat-conducting layer is arranged between the metal wire layer and the sheath layer. When in use, one side of the heat-conducting sheet contacts the pipe or other heat-insulating substrate. In this way, the heat dissipated from the side of the heating belt that is not in contact with the pipe or other heat-insulating substrate is greatly reduced. The heat exchange between the heating belt and the outside world is mainly concentrated on the pipe or other heat-insulating substrate, saving energy.

In this embodiment, an isolation strip 31 is formed between adjacent notches, and the isolation strip is mainly used to connect the notches to prevent the sheath layer from being disconnected at the notches and losing its protective function. Generally, the relationship between the length L of the notch and the width M of the isolation strip satisfies the formula: L≥15M.

Embodiment 2, Embodiment 2 is a preferred implementation of Embodiment 1, referring to Figures 3 to 10, the electric heating belt body 7 is detachably connected with a fixing member 8, and the fixing member includes a first fixing member 10 and a second fixing member 11; first fixing parts 12 are provided on both sides of the first fixing member, each of the first fixing parts is provided with a first fixing hole 13, and a first groove 14 is provided on the first fixing member at a position between the two first fixing holes, and a fixing groove 18 is provided in the first groove; second fixing parts 15 are provided on both sides of the second fixing member, each of the second fixing parts is provided with a second fixing hole 16, and a second groove 17 is provided on the second fixing member at a position between the two second fixing holes. It should be noted that each of the above-mentioned first fixing parts Two or more fixing holes may also be provided on the first fixing part, and the first groove is provided between the fixing holes on both sides of the first fixing part, and of course it can also be said that it is located between the fixing parts on both sides of the first fixing part; the first fixing part and the second fixing part can be fixed as a whole through the first fixing holes and the second fixing holes on both sides, and generally, they can be fixed by bolts, and when the first fixing part and the second fixing part are fixed as a whole, the first groove and the second groove form a through hole; a metal wire connector is provided in the through hole, and the metal wire connector includes an outer frame 19, and a partition 20 is provided in the outer frame, and wiring parts are fixed on both sides of the partition, wherein the outer frame and the partition are made of insulating material or an insulating layer is provided on the surface after being made of metal material, so that the outer frame and the partition are connected to the wiring parts Achieve electrical isolation; the wiring member includes two symmetrically arranged conductive sheets 21, the conductive sheets are in the shape of an arc, and the two ends of the two conductive sheets are correspondingly connected, so that two interconnected spaces are formed inside the connector; a plurality of spring sheets 22 are circumferentially arranged on the conductive sheet, and the spring sheet includes a connecting section 23 and a fixed section 24, one end of the connecting section is connected to the conductive sheet, and the other end is connected to the fixed section; the connecting section and the fixed section are both inclined relative to the conductive sheet, and the distance from one end of the spring sheet connected to the conductive sheet to the arc center of the conductive sheet is greater than the distance from the other end to the arc center of the conductive sheet. In this application, the arc center is the center of the circle to which the arc belongs; the angle between the connecting section and the plane where the conductive sheet is located is smaller than the angle between the fixed section and the plane where the conductive sheet is located. , so that a bend is formed at the position where the fixed section and the connecting section are connected, which is bent outward; referring to FIG9 , in each of the wiring members, the heights of the springs on the two conductive sheets are different; a cover plate 25 is provided at one end of the outer frame, and the connectors on the cover plate corresponding to the two sides of the partition are provided with connecting holes, and the shape of the connecting holes is the same as the shape of the connecting members, so that the connecting holes form two symmetrical arc-shaped threaded holes 27, and screws 26 are threadedly connected to the threaded holes. In this embodiment, the screws can also be replaced by bolts, and the height difference of the conductive sheet is greater than the thickness of the screws; a fixing block 29 is provided on the outer frame to cooperate with the fixing groove, so that the fixing block can be stuck in the fixing groove when fixed, which can ensure that the outer frame cannot slide relative to the through hole compared to the method of directly clamping the outer frame by friction. In order to prevent the screws from taking up space, in this embodiment, the screws use machine screws, which can also be called top screws, headless screws, etc.

The above-mentioned high temperature resistant insulation type AHT armored electric heating cable has the following advantages:

1. The fixing piece can be used to fix the electric heating belt body and can also be used to connect two or more heating belt bodies, which is easy to use: when fixing the heating belt body, only the first fixing piece and the second fixing piece are used, and bolts, screws, etc. are used to match the corresponding fixing holes to fix it on the pipe or other insulation substrate and press the heating belt body so that the heating belt body passes through the corresponding groove;

When connecting two heating tape bodies, strip the connection ends of the two heating tapes to expose the first metal wire and the second metal wire, clamp the metal wire connector in the through hole, then pinch the first fixing member and the second fixing member, and insert the exposed first metal wire and the second metal wire of one of the heating tapes through the end of the outer frame without a cover plate into a pair of conductive sheets and pass through the threaded holes, then bend or twist the ends of the two metal wires to form a blocking portion, pull down the metal wire to deform the conductive sheet, gradually make the fixed section horizontal, and gradually make the connecting section vertically close to the wire, screw the corresponding screws on the corresponding threaded holes to hold up the blocking portion so that it cannot rebound, and a heating tape is connected; similarly, The exposed first metal wire and the second metal wire of a heating tape are inserted into another pair of conductive sheets through one end of the outer frame without a cover plate and then pass through the threaded holes. Then the ends of the two metal wires are bent or twisted to form a blocking portion. The metal wire is pulled down to deform the conductive sheet, the fixed section gradually becomes horizontal, and the connecting section gradually becomes vertically close to the wire. The corresponding screws are screwed into the corresponding threaded holes to support the blocking portion so that it cannot rebound, and the other heating tape is connected. In this way, the wires of the two heating tapes form an electrical connection structure. Finally, bolts, screws, etc. are used to match the corresponding fixing holes to fix the fixings on the pipe or other thermal insulation substrates. It should be noted that the metal wires corresponding to the spring sheets with lower heights should be connected first.

2. The fixing part is cleverly designed. The spring clip is designed in two sections, so that when it is stressed, one section gradually moves horizontally, and the other section gradually moves vertically so that the connection section can finally be close to the metal wire, with a large contact area with the metal wire and good conductive effect; the spring clip is designed circumferentially, so that it contacts the metal wire more evenly and does not need to be limited by force perpendicular to the spring clip when limiting, so as not to damage the metal wire; when removing the connection between the two heating tapes, the corresponding screws can be unscrewed, and the blocking part of the metal wire can be cut off to conveniently remove the heating tape, and the heating tape and the fixing part can be reused; the conductive sheet is designed in an approximate 8-shaped shape, which reduces the overall thickness of the fixing part and does not affect the threading of the metal wire when connecting the two heating tapes. In this embodiment. The height of each pair of conductive sheets is generally set differently to facilitate the production of standard parts, and the conductive sheets can be connected as a whole through connecting sheets.

Of course, three or more arc-shaped spring plates can be set to achieve the connection of three or more electric heating cables. As a variation, the above four spring plates can also be set into two symmetrical groups. Specifically, in each of the wiring members, the spring plates on the two conductive plates are located on both sides of the conductive plates. Correspondingly, the two ends of the outer frame are provided with cover plates, one of which covers a pair of conductive plates on both sides of the partition, so that at the same end, the other pair of conductive plates is not covered and can be used to pass metal wires; the other cover plate covers another pair of conductive plates on both sides of the partition, and the threaded holes on the cover plate can be set to circular. When using this structure, two pairs of metal wires can be threaded from both ends and fixed, which is convenient to use;

As an implementation method, only one group of conductive sheets can be provided. The conductive sheets are arranged in a circular shape. A cover plate and a threaded hole are arranged at one end of the outer frame. In this way, two wires are passed through one conductive sheet during use. This design can make the two sections of the spring sheet longer. When subjected to force, the deformation angles of the two sections become smaller, and the elastic sheet is easier to restore to its original state after the heating belt is removed.

The above-mentioned embodiments only express the implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be based on the attached claims.

Claims (7)

1. The high-temperature-resistant insulating AHT armored electric tracing band comprises an electric tracing band body (7), wherein the electric tracing band body comprises a first metal wire (1) and a second metal wire (2), a conductive plastic layer (3) is sleeved outside the first metal wire and the second metal wire, the conductive plastic layer is made of PCT plastic, the conductive plastic layer isolates the first metal wire from the second metal wire, and an insulating layer (4) is arranged outside the conductive plastic layer; it is characterized in that the method comprises the steps of,

The outer side of the insulating layer is provided with a reticular metal wire layer (5), the outer side of the reticular metal wire layer is sleeved with a sheath layer (6), and one side of the sheath layer is provided with a plurality of notches (30) along the length direction;

A heat-insulating heat-conducting layer (9) is arranged between the metal wire layer and the sheath layer, the heat-insulating heat-conducting layer comprises a heat-insulating sheet (91) and a heat-conducting sheet (92), one end of the heat-insulating sheet is connected with one end of the heat-conducting sheet, the other end of the heat-insulating sheet is connected with the other end of the heat-conducting sheet, the heat-conducting sheet is arranged corresponding to one side of the sheath layer, on which a notch is arranged, and the heat-insulating sheet is arranged corresponding to the other side of the sheath layer;

The electric tracing band body is detachably connected with a fixing piece (8), and the fixing piece comprises a first fixing piece (10) and a second fixing piece (11);

the two sides of the first fixing piece are provided with first fixing parts (12), the first fixing parts are provided with first fixing holes (13), the first fixing piece is provided with first grooves (14) at positions between the first fixing holes at the two sides, and fixing grooves (18) are formed in the first grooves;

The two sides of the second fixing piece are provided with second fixing parts (15), the second fixing parts are provided with second fixing holes (16), and second grooves (17) are formed in the second fixing piece at positions between the second fixing holes on the two sides;

The first fixing piece and the second fixing piece can be fixed into a whole through the first fixing holes and the second fixing holes at two sides, and in this state, the first groove and the second groove form a through hole;

A metal wire connecting piece is arranged in the through hole and comprises an outer frame (19), a partition board (20) is arranged in the outer frame, and wiring pieces are fixed on two sides of the partition board;

The wiring piece comprises two symmetrically arranged conductive sheets (21), the shape of the conductive sheets is a major arc, and two ends of the two conductive sheets are correspondingly connected, so that two mutually communicated spaces are formed inside the connecting piece; a plurality of elastic pieces (22) are circumferentially arranged on the conductive sheet, each elastic piece comprises a connecting section (23) and a fixing section (24), one end of each connecting section is connected with the conductive sheet, and the other end of each connecting section is connected with the fixing section; the connecting section and the fixing section are inclined relative to the conductive sheet, the distance from one end of the elastic sheet connected with the conductive sheet to the arc center of the conductive sheet is greater than the distance from the other end of the elastic sheet to the arc center of the conductive sheet, and the included angle of the connecting section relative to the plane of the conductive sheet is smaller than the included angle of the fixing section relative to the plane of the conductive sheet;

in each wiring piece, the heights of the elastic sheets on the two conductive sheets are different;

one end of the outer frame is provided with a cover plate (25), connecting pieces corresponding to two sides of the partition board are respectively provided with a connecting hole, the shape of each connecting hole is the same as that of each connecting piece, so that the connecting holes form two symmetrical arc threaded holes (27), screws (26) are connected to the threaded holes in a threaded mode, and the height difference of the conductive plates is larger than the thickness of the screws;

The outer frame is provided with a fixing block (29) matched with the fixing groove.

2. The high temperature resistant insulated AHT armored electrical heat trace of claim 1, wherein,

Spacers (31) are formed between adjacent notches, the relationship between the length of the notches and the width of the spacers satisfying the following formula

L≥15M

Wherein L is the length of the notch, and M is the width of the spacer.

3. The high temperature resistant insulated AHT armored electrical trace tape of claim 1, wherein the insulating layer is made of one or more of modified polyolefin, fluorinated polyolefin and perfluorinated material.

4. The high temperature resistant insulated AHT armored electrical trace tape of claim 1, wherein the jacket layer is made of one or more of a modified polyolefin and a perfluorinated material.

5. The high temperature resistant insulated AHT armored electrical trace of claim 1, wherein the screw is a machine screw.

6. The high temperature resistant insulated AHT armored electrical tracing band of claim 1, wherein the outer frame and the separator are made of insulating materials or are provided with an insulating layer on the rear surface thereof;

the conductive sheet and the elastic sheet are made of conductive materials.

7. The high temperature resistant insulated AHT armored electrical heat trace of claim 6, wherein,

The conductive sheet and the elastic sheet are made of metal materials.