CN2571109Y

CN2571109Y - Screw-type resistance heating cable

Info

Publication number: CN2571109Y
Application number: CN 02267116
Authority: CN
Inventors: 王芳
Original assignee: Individual
Current assignee: Individual
Priority date: 2002-09-13
Filing date: 2002-09-13
Publication date: 2003-09-03
Anticipated expiration: 2012-09-13

Abstract

The utility model provides a screw-type resistance heating cable which can effectively prevent circuit break which results from the crack of a concrete body. The cable uses a screw-type conducting core wire as a heating resistor, and uses the principle of infrared low temperature irradiation for heating so as to screen electromagnetic waves. The utility model has the structure that two conducting core wires (one or a plurality of conducting core wires are wound) which are coated by insulation material are wound according to the same screw pitch and screwing direction on an insulated wire body, and the definite distance between two conducting core wires is kept; the outer of the insulated wire body which is wound by the conducting core wires is coated by main insulation; the outer of the main insulation is coated by a metal screen protection net, and an insulation sleeve is coated on the outer of the metal screen protection net. The cable can be used for the fields of heating for a building, ice removal in a road surface place, heating for a car seat, heating for planting, etc.

Description

Spiral resistance heating cable

Affiliated technical field the utility model relates to a kind of spiral resistance heating cable with electro-magnetic screen function that is arranged in ceiling, body of wall and the ground concrete body.This cable can prevent because of opening circuit that concrete body crack causes, and can be widely used in fields such as building and heating, the deicing of place, road surface, automotive seat heating and plantation heating.

Background technology is present, and common heating cable is to be made of straight conductive core line, insulation, shielding and sheath mostly.These heating cable generally are laid in the concrete body, and concrete is known from experience the generation crack sometimes, and cable is broken, and causes the electric heating loop open circuit.Because cable laying is in concrete, repairs difficulty, often cause the tremendous economic loss.

Summary of the invention the utility model provides a kind of spiral resistance heating cable, this cable utilizes the heating of infrared ray low-temp radiating principle, can shielding electromagnetic wave, and this cable adopts spiral conductive core line as heating resistor, can prevent because of opening circuit that concrete body crack causes.

The technical solution adopted in the utility model is: on the insulated wire body, twine two conductive core lines according to the same pitch and the hand of spiral, and every conductive core line outsourcing insulating material, two conductive core lines keep certain spacing; In the external bag main insulation of insulated wire of twining conductive core line; Main insulation kalamein shielding protection net; Metallic shield catch net outsourcing insulating sleeve.In the utility model, the insulated wire body can be cylinder, oval cylinder or other cylinder, conductive core line can be circle line or lenticular wire, sub-thread or multiply, the every outer insulating material that is wrapped of conductive core line can omit, the conductive core line that twines on the insulated wire body can be one or more, pitch can be uniform pitch or varying pitch, and the hand of spiral can change.During use, two conductive core lines electrical connections of spiral resistance heating cable one end of the utility model, two conductive core lines of the cable other end are connect power supply, constitute the resistance heating loop.When with the utility model spiral resistance heating cable laying in the concrete body, the crack takes place and during the stretching cable in the concrete body, since the conductive core line of the spiral resistance heating cable of the utility model in the shape of a spiral shape, enough big elongation surplus is arranged, so can prevent from effectively to break.

Description of drawings further specifies the utility model below in conjunction with drawings and Examples.

Fig. 1 is a three-dimensional structure diagram of the present utility model.

Fig. 2 is the circuit theory diagrams that the utility model adopts two conductive core lines.

Fig. 3 is the circuit theory diagrams that the utility model adopts three conductive core lines.

Fig. 4 is the circuit theory diagrams that the utility model adopts a conductive core line.

Among the figure: 1. insulated wire body, 2. first conductive core line insulation, 3. first conductive core line, 4. second conductive core line, 5. second conductive core line insulation, 6. main insulation, 7. metallic shield catch net, 8. insulating sleeve.R1 among Fig. 2, R2 represent the resistance of first and second conductive core lines among the utility model first embodiment respectively; R among Fig. 3 _A, R _B, R _CRepresent the resistance of first, second and third conductive core line among the utility model second embodiment respectively; R among Fig. 4 represents the resistance of the conductive core line among the utility model the 3rd embodiment.

It is the three-dimensional structure diagram of the utility model first embodiment that embodiment illustrates shown in Figure 1, and Fig. 2 is its circuit theory diagrams.Present embodiment adopts resistant to elevated temperatures crosslinked polyethylene; nonconductive material such as silicon rubber or polyamide is done insulated wire body (1) and main insulation (6); the alloy silk of employing high resistivity or carbon fiber etc. are as first conductive core line (3); adopt the alloy silk of high resistivity; carbon fiber or copper cash etc. are as second conductive core line (4); adopt fluoroplastics; glass fiber or high-strength high temperature-resistant insulating varnish etc. are manufactured conductive core line insulation (2; 5); adopt tinned copper wire; braided metal shielding protection nets (7) such as chromium plating steel wire or stainless steel wire adopt igelite or electro-insulating rubber etc. to manufacture insulating sleeve (8).This embodiment has two conductive core lines, two conductive core lines electrical connections of cable one end, two conductive core lines of the cable other end are connect AC power, constitute the resistance heating loop, alternating current equal and opposite in direction, the direction of two conductive core lines that flows through cable is opposite, the intensity of the alternating magnetic field in two solenoids that conductive core line constituted equates, direction is opposite, so inductance is zero, consume reactive power not.

Fig. 3 is the circuit theory diagrams of the utility model second embodiment.In this embodiment, three identical conductive core lines are arranged in the cable, one end of three conductive core lines is electrically connected, the other end connects A, B, the C phase of three-phase alternating-current supply respectively, constitute Y type electric heating loop, the size of current that flows through three conductive core lines equates, phase angle mutual deviation 120 degree, and the intensity of the alternating magnetic field in three solenoids that conductive core line constituted equates, phase angle mutual deviation 120 degree, so inductance is zero, consume reactive power not.

Fig. 4 is the circuit theory diagrams of the utility model the 3rd embodiment.In this embodiment, have only a conductive core line in the cable, the conductive core line connection power supply with the cable two ends constitutes the resistance heating loop.

Claims

1. spiral resistance heating cable; at conductive core line outsourcing main insulation, main insulation kalamein shielding protection net, metallic shield catch net outsourcing insulating sleeve, it is characterized in that: the conductive core line as heating resistor or its loop is present in the cable in a spiral manner.

2. spiral resistance heating cable according to claim 1 is characterized in that: each root conductive core line is wrapped on the same insulated wire body, and each root conductive core line keeps certain spacing, in the external bag main insulation of insulated wire of twining conductive core line.

3. according to claim 1 and 2 described spiral resistance heating cables, it is characterized in that: the conductive core line that twines on the insulated wire body can be one, two or many.

4. according to claim 1 and 2 described spiral resistance heating cables, it is characterized in that: the insulated wire body can be cylinder, oval cylinder or other cylinder.

5. according to claim 1 and 2 described spiral resistance heating cables, it is characterized in that: conductive core line can be circle line or lenticular wire, sub-thread, two strands or multiply.

6. according to claim 1 and 2 described spiral resistance heating cables, it is characterized in that: every outer can the bag separately of conductive core line is insulated or bag insulation separately.

7. according to claim 1 and 2 described spiral resistance heating cables, it is characterized in that: conductive core line can be alloy silk, carbon fiber, copper cash or other electric wire of high resistivity.

8. according to claim 1 and 2 described spiral resistance heating cables, it is characterized in that: two or many conductive core lines are wrapped on the insulated wire body according to the same pitch and the hand of spiral.

9. according to claim 1 and 2 described spiral resistance heating cables, it is characterized in that: the pitch that conductive core line twines can be uniform pitch or varying pitch, and the hand of spiral can change.