CN107635298A - A series electric heating belt - Google Patents

Abstract

The present invention provides a kind of series electric heating band, including cored wire, insulating barrier, inner restrictive coating, rubber skeleton, reinforcement, packed layer, screen layer, external sheath layer, enhancement layer and wire, the series electric heating band of the present invention, the resistance of core unit length and the electric current passed through are very fixed, so the first heating in whole ribbon heater is uniform, power output is constant, grown using length, and built-in rubber skeleton, reinforcement and wire, the fastness of heating tape can preferably be ensured, exposed inner cored wire will not be bent, ensure that safe to use, adds service life.

Description

A series electric heating belt

technical field

The invention relates to an electric heating belt, in particular to a serial electric heating belt.

Background technique

Electric heating cables are a new type of high-tech product. Since they entered the application field in the 1970s, they can be widely used in the transportation of liquid objects in pipelines and the antifreeze and heat preservation of tanks, maintaining process temperature, heating roads, and ramps. , Crosswalks, eaves and floors, etc. When the electric heating cable is working, if the heat transferred by the electric heating cable to the system per unit time is equal to the heat transferred from the system to the external environment, the temperature of the system remains unchanged. The highest temperature that the system can reach is called the highest maintenance temperature.

The series electric heating belt is to use three parallel insulated copper strands with the same cross-sectional area and a certain length as the power bus and heating core wire, one end of which is reliably short-circuited, and the other end is connected to a 380V (or designed voltage) power supply. A star-shaped load is formed, and the electric energy is converted into heat energy. The star-shaped load continuously releases heat, forming a continuous and uniform electric heating cable. Because of its safety and reliability, wide application, no pollution to the environment, and long life, it is widely used in pipelines and storage tanks in petroleum, chemical, steel, electric power and other industrial enterprises for thermal insulation, anticoagulation, and antifreeze; it is generally applicable to ordinary areas. , hazardous and corrosive areas. However, in some occasions, it is necessary to set the series electric heating belt at high altitude. Due to its own weight, the electric heating belt is prone to sag and break after a long time, and some electric heating belts may crack and cause safety accidents, shortening the service life and bringing great harm to the enterprise. to direct economic losses. It is therefore conceived to provide a new structure to solve this problem.

Contents of the invention

In order to make up for the deficiencies of the prior art, the present invention provides a simple structure, convenient use, safety and sanitation.

The present invention is achieved through the following technical solutions:

A series electric heating belt, comprising a core wire, an insulating layer is arranged outside the core wire, an inner sheath layer is arranged outside the insulating layer, a rubber skeleton is installed outside the inner sheath layer, a shielding layer is arranged outside the rubber skeleton, and a shielding layer is arranged outside the shielding layer. An outer sheath layer is provided, and a reinforcement layer is arranged outside the outer sheath layer. A plurality of metal wires are evenly distributed circularly in the middle of the reinforcement layer, and a filling layer is arranged between the inner sheath layer and the shielding layer.

In the tandem electric heating belt of the present invention, the core wires are three cores, two cores or single cores, reinforcing ribs are arranged between the inner sheath layers outside the two cores and three cores, and the rubber skeleton between the two core structure core wires is Oval, the rubber skeleton between the single-core structure and the three-core structure core wire is triangular.

In the tandem electric heating belt of the present invention, the reinforcing rib is fixedly connected with the rubber skeleton, and the reinforcing rib is made of high-strength nylon material.

In the tandem electric heating belt of the present invention, the inner sheath layer and the outer sheath layer are made of flame-retardant polyolefin.

In the series-type electric heating belt of the present invention, the shielding layer is tinned copper wire.

In the tandem electric heating belt of the present invention, the reinforcing layer is made of high-temperature flame-retardant fluoroplastics.

In the tandem electric heating belt of the present invention, the material of the filling layer is PP rope or hemp rope.

In the tandem electric heating belt of the present invention, the insulating layer is made of F46 fluoroplastic.

In the series-type electric heating belt of the present invention, the cross-sectional area of the core wire is 2-10mm ^{2 , the resistivity of the core wire is 0.02-1.1 Ωmm 2 /} cm ² , the heat release load of the core wire is less than or equal to 0.2 W/cm ² , and the core current The density is less than 20 A/mm ² .

In the tandem electric heating belt of the present invention, the explosion-proof grade of the electric heating belt is ExIT4.

The beneficial effects of the present invention are:

In the series-type electric heating belt of the present invention, the resistance per unit length of the wire core and the passing current are both very constant, so the whole electric heating belt is the first to generate heat evenly, the output power is constant, and the length of use is long. It also has a built-in rubber skeleton, reinforcing ribs and metal wires. It can better ensure the firmness of the heating cable, and will not bend and expose the inner core wire, which ensures the safety of use and increases the service life.

Description of drawings

The present invention will be further described below in conjunction with accompanying drawing.

Fig. 1 is a schematic diagram of a three-core structure of the present invention;

Fig. 2 is a schematic diagram of the structure of two cores of the present invention;

Fig. 3 is a schematic diagram of the single core structure of the present invention.

In the figure, 1 core wire; 2 insulation layer; 3 inner sheath layer; 4 rubber skeleton; 5 reinforcement rib; 6 filling layer; 7 shielding layer; 8 outer sheath layer; 9 reinforcement layer;

detailed description

For ease of description, spatially relative terms such as "upper," "lower," "left," and "right" may be used herein to describe the relationship of one element or feature relative to another element or feature shown in the figures. It will be understood that the spatial terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary term "lower" can encompass both an orientation of above and below.

Accompanying drawing is a kind of specific embodiment of the present invention. This embodiment includes a core wire 1, an insulating layer 2 is arranged outside the core wire 1, an inner sheath layer 3 is arranged outside the insulating layer 2, a rubber skeleton 4 is installed outside the inner sheath layer 3, and a shielding layer is arranged outside the rubber skeleton 4 7. An outer sheath layer 8 is arranged on the outer side of the shielding layer 7, and a reinforcement layer 9 is arranged on the outside of the outer sheath layer 8. A plurality of metal wires 10 are evenly distributed in the middle of the reinforcement layer 9, and the metal wires 10 are all cylindrical structures. A filling layer 6 is arranged between the inner sheath layer 3 and the shielding layer 7, the rubber skeleton 4 can better fix the core wire 1, and the filling layer 6 can further ensure the tightness of the internal structure and prevent the core wire from The interaction between 1 affects the heating effect and shortens the service life. The diameter of the metal wire 10 is very small, about 1/10 of the ring diameter of the reinforcement layer 9, which plays a strengthening effect and ensures the lightness of the electric heat tracing.

In the tandem electric heating belt of the present invention, the core wire 1 is three-core, two-core or single-core, and a reinforcing rib 5 is arranged between the inner sheath layer 3 outside the two cores and the three cores, and the reinforcing rib 5 is in contact with the rubber The skeleton 4 is fixedly connected, and the reinforcing rib 5 is made of high-strength nylon material. The reinforcing rib 5 can further fix the core wires 1. The rubber skeleton 4 between the core wires 1 of the two-core structure is oval. The single-core structure and three The rubber skeleton between the core wires 1 of the core structure is triangular.

In the tandem electric heating belt of the present invention, the inner sheath layer 3 and the outer sheath layer 8 are made of flame-retardant polyolefin, the shielding layer 7 is tinned copper wire, and the reinforcing layer 9 is made of high-temperature flame-retardant fluorine plastic.

In the tandem electric heating belt of the present invention, the filling layer 6 is made of PP rope or hemp rope, and the insulating layer 2 is made of F46 fluoroplastic.

In the series-type electric heating belt of the present invention, the cross-sectional area of the core wire 1 is 2-10 mm ² , the resistivity of the core wire 1 is 0.02-1.1 Ωmm ² /cm ² , and the heat release load of the core wire 1 is less than or equal to 0.2 W/cm ² , The current density of core 1 is less than 20 A/mm ² .

In the tandem electric heating belt of the present invention, the explosion-proof grade of the electric heating belt is ExIT4.

When using, choose the appropriate wire core structure for installation according to the actual use environment. If the line is long, you can use the series high-power connection kit for multi-segment connection.

The specific implementation of the present invention has been described in detail above, but only as an example, the present invention is not limited to the specific implementation cases described above, and equivalent modifications to the present invention are also within the protection scope of the present invention.

Claims (10)

1. a kind of series electric heating band, including cored wire（1）, it is characterised in that：Cored wire（1）Outside is provided with insulating barrier（2）, insulation Layer（2）Outside is provided with inner restrictive coating（3）, inner restrictive coating（3）Outside is provided with rubber skeleton（4）, rubber skeleton（4）Outside is set It is equipped with screen layer（7）, screen layer（7）Outside is provided with external sheath layer（8）, external sheath layer（8）Outside is provided with enhancement layer（9）； The enhancement layer（9）Intermediate annular is evenly equipped with some wires（10）；The inner restrictive coating（3）And screen layer（7）Between set There is packed layer（6）.

2. series electric heating band as claimed in claim 1, it is characterised in that：Cored wire（1）For three cores, two cores or single, two cores With the inner restrictive coating outside three cores（3）Between be provided with reinforcement（5）, two-chip structure cored wire（1）Between rubber skeleton（4）To be ellipse Circle, single structure and three-core structure cored wire（1）Between rubber skeleton（4）For triangle.

3. series electric heating band as claimed in claim 2, it is characterised in that：Reinforcement（5）With rubber skeleton（4）It is fixed to connect Connect, reinforcement（5）For high-strength nylon material.

4. series electric heating band as claimed in claim 1, it is characterised in that：Inner restrictive coating（3）And external sheath layer（8）It is resistance Fire polyolefin material.

5. series electric heating band as claimed in claim 1, it is characterised in that：Screen layer（7）For tinned wird.

6. series electric heating band as claimed in claim 1, it is characterised in that：Enhancement layer（9）For high temperature flame-proof fluoroplastics.

7. series electric heating band as claimed in claim 1, it is characterised in that：Packed layer（6）Material for PP restrict or the rope made of hemp.

8. series electric heating band as claimed in claim 1, it is characterised in that：Insulating barrier（2）For F46 fluoroplastics materials.

9. series electric heating band as claimed in claim 1, it is characterised in that：Cored wire（1）Sectional area is 2 ~ 10mm², cored wire（1） Resistivity is 0.02 ~ 1.1 Ω mm²/cm², cored wire（1）Heat release load is less than or equal to 0.2 W/cm², core（1）Current density is small In 20 A/mm²。

10. series electric heating band as claimed in claim 1, it is characterised in that：The explosive-proof grade of ribbon heater is the T4 of Ex I.