阅读说明：本技术 一种多芯发热电缆 (Multi-core heating cable ) 是由 吕为安 田明 任玉 于 2021-09-30 设计创作，主要内容包括：本发明涉及电缆领域,具体公开了一种多芯发热电缆。包括屏蔽层、护套、接地线和功率逐渐增大的至少两根发热芯,屏蔽层套和护套均为筒状,且屏蔽层套设在接地线和发热芯上,护套套设在屏蔽层上。本发明中的多芯发热电缆能够改变工作时的功率,以延长使用寿命、提高使用的安全性。(The invention relates to the field of cables, and particularly discloses a multi-core heating cable. Including shielding layer, sheath, earth connection and two at least cores that generate heat that power is crescent gradually, shielding layer cover and sheath are the tube-shape, and the shielding layer cover is established on earth connection and the core that generates heat, and the sheath cover is established on the shielding layer. The multi-core heating cable can change the power during working so as to prolong the service life and improve the use safety.)

1. A multi-core heating cable is characterized in that: including shielding layer, sheath, earth connection and two piece at least heating cores that power is crescent gradually, shielding layer cover and sheath are the tube-shape, and the shielding layer cover establish on the earth connection and heating core, the sheath cover is established on the shielding layer.

2. A multi-core heating cable as claimed in claim 1, wherein: the heating cores comprise heating wires and insulating layers coated outside the heating wires.

3. A multi-core heating cable as claimed in claim 2, wherein: the power of one heating core is 12-14W/m.

4. A multi-core heating cable as claimed in claim 3, wherein: the power of one heating core is 6-8W/m.

5. The multi-core heating cable as claimed in claim 4, wherein: the shielding layer is a metal braided sleeve.

6. A multi-core heating cable as claimed in claim 3, wherein: the heating wire in the heating core with the power of 12-14W/m consists of 7-8 strands of alloy wires.

7. The multi-core heating cable as claimed in claim 4, wherein: the heating wire in the heating core with the power of 6-8W/m is composed of 5-6 strands of alloy wires.

8. A multi-core heating cable as claimed in claim 2, wherein: there are a plurality of position sleeves along axis clearance distribution in the shielding layer, the position sleeve is including dismantling first location portion and the second location portion of connection, the lateral wall that first location portion and second location portion are close to each other all is equipped with a plurality of curved constant head tanks, a plurality of constant head tanks and earth connection and at least two core one-to-one that generate heat.

9. A multi-core heating cable as claimed in claim 8, wherein: a plurality of grooves are distributed on the outer wall of the insulating layer along the axial clearance and correspond to the positioning grooves one to one.

Technical Field

The invention relates to the field of cables, in particular to a multi-core heating cable.

Background

The heating cable generates heat by utilizing electric energy, and the heating or heat preservation effect is realized. The existing heating cable comprises a single-conductor heating cable and a double-conductor heating cable, wherein only one heating core in the single-conductor heating cable cannot form a loop, so that when the heating cable is installed, two ends of the heating cable are connected with a power supply; the double-conductor heating cable comprises two heating cores, and the heating cores can be folded at the tail part of the heating cable, so that the two heating cores form a loop, and when the double-conductor heating cable is installed, only a power supply and the wiring end of the heating cable are required to be connected, and the two ends are not required to be connected.

Although the double-conductor heating cable comprises the two heating cores, one ends of the two heating cores are connected, and when the double-conductor heating cable works, the two heating cores in the double-conductor heating cable work simultaneously, so that the heating power cannot be adjusted after the double-conductor heating cable is installed. For a heating cable with larger power, the installation requirement of the heating cable is higher: when the heating cable works, heat generated by the heating core needs to be timely dissipated, otherwise the local temperature of the heating cable is easily increased, so that the insulation effect of the insulating layer at the position is deteriorated, the service life of the heating cable can be prolonged and potential safety hazards can be generated after the insulation effect is deteriorated.

Disclosure of Invention

The invention aims to provide a multi-core heating cable capable of changing power during operation so as to prolong the service life and improve the use safety.

In order to achieve the purpose, the invention adopts the following technical scheme: the utility model provides a multicore heating cable, includes shielding layer, sheath, earth connection and two at least heating cores that power is crescent, and shielding layer cover and sheath are the tube-shape, and the shielding layer cover is established on earth connection and heating core, and the sheath cover is established on the shielding layer.

The beneficial effect of this scheme does:

heating cable in this scheme is equipped with two at least cores that generate heat, and the power of the core that generates heat of difference is different, after the installation, can select suitable core that generates heat according to ambient temperature: when the ambient temperature is lower, a heating core with higher power can be used; when the ambient temperature is higher, a heating core with lower power can be used; when ambient temperature crosses lowly, can use two piece at least cores that generate heat simultaneously to make heating cable reach different operating power, also avoid long-time power of using the great core that generates heat of generating heat of power to lead to the heat not in time giving off and make local insulating effect variation, thereby avoid heating cable's life to shorten or produce the potential safety hazard.

Furthermore, the heating cores comprise heating wires and insulating layers coated outside the heating wires.

The beneficial effect of this scheme does: the insulating layer can play insulating effect to the heater, avoids the electric leakage.

Furthermore, the power of one heating core is 12-14W/m.

The beneficial effect of this scheme does: the heating core with the power of 12-14W/m is a commonly used high-power heating core, and the applicability of the heating cable is improved.

Furthermore, the power of one heating core is 6-8W/m.

The beneficial effect of this scheme does: the heating core with the power of 6-8W/m is a commonly used low-power heating core, and the applicability of the heating cable is further improved. In addition, when the ambient temperature is too low, the power obtained by combining the heating core with the power of 12-14W/m and the heating core with the power of 6-8W/m cannot be too high, and the potential safety hazard is further avoided.

Furthermore, the shielding layer is a metal braided sleeve.

The beneficial effect of this scheme does: the shielding layer woven by the metal strip enables the heating cable to be bent to a certain degree, so that the heating cable is convenient to mount.

Furthermore, the heating wire in the heating core with the power of 12-14W/m consists of 7-8 strands of alloy wires.

The beneficial effect of this scheme does: the heating core is composed of the multiple strands of alloy wires, and the power of the formed heating core can be more conveniently controlled by controlling the number of the alloy wires, so that the production is facilitated.

Furthermore, the heating wire in the heating core with the power of 6-8W/m consists of 5-6 strands of alloy wires.

The beneficial effect of this scheme does: the heating core is composed of the multiple strands of alloy wires, and the power of the formed heating core can be more conveniently controlled by controlling the number of the alloy wires, so that the production is facilitated.

Further, there are a plurality of position sleeves along axis clearance distribution in the shielding layer, and the position sleeve is including dismantling first location portion and the second location portion of connection, and the lateral wall that first location portion and second location portion are close to each other all is equipped with a plurality of curved constant head tanks, a plurality of constant head tanks and earth connection and at least two core one-to-ones that generate heat.

The beneficial effect of this scheme does: the position sleeve in this scheme can fix a position a plurality of cores and earth connection etc. that generate heat, avoids when the installation shielding layer, and the core that generates heat takes place to shift and twist reverse with the earth connection. In addition, when the installation, the position sleeve in this scheme can also support the core and the earth connection that generate heat, avoids generating heat the core and the earth connection warp.

Furthermore, a plurality of grooves are distributed on the outer wall of the insulating layer along the axial gap, and the grooves correspond to the positioning grooves one to one.

The beneficial effect of this scheme does: after the heating core is formed, a driving roller is generally needed to be used for guiding the heating core to the next process, and the driving roller moves the heating core to pull the heating core forwards, so that the heating core is easily stretched and deformed. During cable erection in this scheme, the accessible aligns recess and position sleeve on with the different core that generates heat and can avoid a certain core that generates heat to be stretched, and the recess also can fix a position the position sleeve, avoids the position sleeve to take place axial skew.

Drawings

FIG. 1 is a perspective view of example 1 of the present invention;

fig. 2 is a left vertical sectional view of embodiment 2 of the present invention.

Detailed Description

The following is further detailed by way of specific embodiments:

reference numerals in the drawings of the specification include: heating core 1, heater 11, insulating layer 12, earth connection 2, shielding layer 3, sheath 4, position sleeve 5, locating piece 51.

Example 1

A multi-core heating cable is shown in figure 1 and comprises a shielding layer 3, a sheath 4, a ground wire 2 and at least two heating cores 1, specifically, the two heating cores 1 in the embodiment are arranged, the ground wire 2 and the two heating cores 1 are distributed in a delta shape, the two heating cores 1 respectively comprise a heating wire 11 and an insulating layer 12 coated outside the heating wire 11, and specifically, the insulating layer 12 in the embodiment is made of XLPE. The power of one heating core 1 is 13W/m, and a heating wire 11 in the heating core is composed of 7 strands of existing alloy wires; the power of the other heating core 1 is 7W/m, and the heating wire 11 in the other heating core is composed of 5 strands of existing alloy wires.

Shielding layer 3 and sheath 4 are cylindricly, and shielding layer 3 in this embodiment is woven the metal woven cover that forms by the copper wire, and 3 covers of shielding layer are established outside earth connection 2 and two cores 1 that generate heat, and the space between shielding layer 3 and the core 1 that generates heat and earth connection 2 is filled with current cable filler. The sheath 4 is sleeved outside the shielding layer 3, and the sheath 4 in this embodiment is made of PVC.

The specific implementation process is as follows:

when the cable is installed, two ends of the two heating cores 1 in this embodiment need to be connected to the power supply respectively, and the connection mode is the same as that of the existing cable, which is not described in this embodiment again. Taking the environment temperature of 5 ℃, 18 ℃ and 20 ℃ as an example, when the environment temperature is 5 ℃ and the environment temperature is too low, the two heating cores 1 are started simultaneously, and the power of the heating cable reaches 20W, so that the national standard is met, the environment temperature can be quickly raised, and the heating effect is improved; when the ambient temperature is 18 ℃, the ambient temperature is lower, and only the heating core 1 with the power of 13W/m can be started; when the environmental temperature is 20 ℃ or above, the heating core 1 with the power of 7W/m is started, so that the heating cable keeps working with lower power, the service life of the heating cable is prolonged, and the use safety is improved.

Example 2

On the basis of embodiment 1, as shown in fig. 2, a plurality of positioning sleeves 5 are sequentially distributed in the shielding layer 3 in this embodiment along the axial direction at intervals, each positioning sleeve 5 in this embodiment includes a first positioning portion and a second positioning portion, wherein a positioning block 51 is integrally formed on a right wall of the first positioning portion and a left wall of the second positioning portion, the positioning block 51 of the first positioning portion is located at the upper end of the first positioning block 51, the positioning block 51 of the second positioning portion is located at the lower end of the second positioning block 51, the upper portion of the first positioning portion is clamped with the second positioning portion through the positioning block 51, and the lower end of the second positioning portion is clamped with the first positioning portion through the positioning block 51.

The constant head tank that is equipped with on the first location portion in this embodiment and generates heat core 1 and earth connection 2 relatively with the left, be equipped with on the second location portion with the right side generate heat another constant head tank that core 1 is relative, and all be equipped with the opening on two insulating layers 12 that generate heat core 1 and move towards the recess of first location portion and second location portion, the recess can carry on spacingly with first location portion and the cooperation of second location portion to position sleeve 5, avoids position sleeve 5 to take place axial skew. Except for this, the installation and use modes in this embodiment are the same as those in embodiment 1, and are not described again in this embodiment.

The foregoing is merely an example of the present invention and common general knowledge in the art of designing and/or characterizing particular aspects and/or features is not described in any greater detail herein. It should be noted that, for those skilled in the art, without departing from the technical solution of the present invention, several variations and modifications can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicability of the patent. The scope of the claims of the present application shall be determined by the contents of the claims, and the description of the embodiments and the like in the specification shall be used to explain the contents of the claims.