Medium-long type self-temperature-limiting electric heating belt

Abstract

The utility model discloses a medium-length type self-temperature-limiting ribbon heater, which comprises two buses arranged in parallel, semiconductor heating core tapes are arranged on the surfaces of the two buses and at the position between the two buses, an inner insulating layer is coated outside the semiconductor heating core tapes, cutting nails are arranged on the inner insulating layer at equal intervals along the length direction, and the cutting nails are connected with the semiconductor heating core tapes. The cutting nails are symmetrically arranged above and below the two buses, and the inner insulating layer and the cutting nails are coated with an outer insulating layer. The self-temperature-limiting ribbon heater extrudes or hammers the mark pattern close to the section position from the outside, cuts the bus and the semiconductor heating core belt through the cutting nails symmetrically arranged inside, or cuts the bus and cuts the semiconductor heating core belt. The part of the bus and the semiconductor heating core belt close to the section can be conveniently twisted, pulled and detached from the section through tools such as pliers, so that the bus and the semiconductor heating core belt cannot be in contact with the woven shielding layer to cause short circuit, and the effect that insulation wrapping is simpler and more guaranteed is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of electric heating band, concretely is a middle long type self -limiting temperature electric heating band. BACKGROUND

[0002] The middle long type self -limiting temperature electric heating band is a kind of electric heating band for preventing freezing, heat tracing and heating of middle long line or container.The maximum use length of single power supply unidirectional power supply circuit is 350m, and the maximum use length of single power supply bidirectional power supply circuit is 700m, with the advantages of uniform heat tracing temperature, no overheating, safe and reliable, saving electric energy, rapid temperature rise start when intermittent operation, no pollution in heating process, etc., widely used in petroleum, chemical industry, electric power, metallurgy, light industry, food, freezing, building, gas, agricultural and sideline products production, processing and other fields, and plays an important role in heat tracing and heating.

[0003] The middle long type self -limiting temperature electric heating band needs to be cut off when installing and using, two busbars are powered by half-conductor heating core band to realize heating, so theoretically it can be cut off at any length for installation and use, just need to insulate the section when cutting off. However, in the actual operation process, the internal woven shielding layer of the cutting surface cannot be guaranteed to be completely neat, and the metal wires constituting the woven shielding layer are prone to loosen and stretch out at the cutting position, which can easily contact the busbar and the half-conductor heating core band to cause short circuit during installation and use. The existing control box is equipped with short circuit protection, so it will trip at the moment of power-on and cannot be used, which brings inconvenience to the later use. UTILITY MODEL CONTENTS

[0004] In view of the deficiencies of the prior art, the utility model provides a middle long type self -limiting temperature electric heating band to solve the problem that the metal wires constituting the woven shielding layer are prone to loosen and stretch out at the cutting position and contact the busbar and the half-conductor heating core band to cause short circuit in the existing middle long type self -limiting temperature electric heating band.

[0005] To solve the above technical problems, the utility model provides the following technical scheme:

[0006] A middle long type self -limiting temperature electric heating band, comprising two parallel busbars, a half-conductor heating core band is arranged on the surface of the two busbars and the position between them, an inner insulation layer is coated outside the half-conductor heating core band, cutting nails are equidistantly arranged on the inner insulation layer along the length direction, and the cutting nails are symmetrically arranged above and below the two busbars, an outer insulation layer is coated outside the inner insulation layer and the cutting nails, a woven shielding layer is coated outside the outer insulation layer, and an insulating wear-resistant outer sheath is coated outside the woven shielding layer, and a mark pattern is printed on the surface of the insulating wear-resistant outer sheath corresponding to the position of the cutting nail.

[0007] The cutting nail comprises a nail cap, a flat nail arranged on the side of the nail cap close to the bus bar and perpendicular to the bus bar axis, and cutting edges arranged on both sides of the flat nail corresponding to the ends of the bus bar.

[0008] Preferably, the distance between the nail cap and the outer wall of the outer insulation layer is not less than half of the wall thickness of the outer insulation layer.

[0009] Preferably, the nail cap is disc-shaped, and the side edge of the nail cap away from the flat nail is a rounded structure.

[0010] Preferably, the flat nail has a plane structure with a width of at least 1mm between the bottoms of the cutting edges on both sides.

[0011] Compared with the prior art, the utility model has the following beneficial effects:

[0012] After the self-limiting temperature electric heating band is cut, the marked pattern close to the cutting surface is extruded or hammered from the outside, the cutting nail arranged symmetrically inside causes a cut on the bus bar and the semiconductor heating core band, or the cutting nail completes cutting of the bus bar and causes a cut on the semiconductor heating core band, so that the part of the bus bar and the semiconductor heating core band close to the cutting surface can be conveniently twisted and pulled off from the cutting surface by using a pliers or other tools, the bus bar and the semiconductor heating core band do not contact the braided shielding layer to cause short circuit, the effect that insulation wrapping is simpler and more secure is achieved, and the problem that the metal wire of the braided shielding layer in the existing medium-long type self-limiting temperature electric heating band is easily loose and stretched out to contact the bus bar and the semiconductor heating core band to cause short circuit at the cutting position is solved. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is a whole structure schematic view of the utility model;

[0014] Figure 2 It is a cross-sectional view of the corresponding position of the cutting nail of the utility model;

[0015] Figure 3 It is a front view of the cutting nail of the utility model;

[0016] Figure 4 It is a side view of the cutting nail of the utility model.

[0017] In the drawing: 1, bus bar; 2, semiconductor heating core band; 3, inner insulation layer; 4, cutting nail; 41, nail cap; 42, flat nail; 43, cutting edge; 5, outer insulation layer; 6, braided shielding layer; 7, insulation wear-resistant outer sheath; 8, marked pattern. DETAILED DESCRIPTION

[0018] Clearly and completely describe the technical scheme in the embodiments of the utility model with reference to the drawings in the embodiments of the utility model, obviously, the described embodiments are only a part of the embodiments of the utility model, and not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the ordinary skill in the art without creative labor belong to the scope of the utility model protection.

[0019] As shown in Figures 1-4 The utility model provides a kind of self-limiting temperature electric heating band, including two parallelly arranged busbar 1, the surface of two busbar 1 and the position between them are provided with semiconductor heating core band 2, semiconductor heating core band 2 is covered with internal insulation layer 3 outside, internal insulation layer 3 is provided with cutting peg 4 equidistantly along length direction, length direction adjacent two cutting pegs 4 can be determined distance according to need during production, it can be set to 30 centimeters, 50 centimeters or other length distance;

[0020] Cutting peg 4 is symmetrically arranged above and below two busbar 1, internal insulation layer 3 and cutting peg 4 are covered with outer insulation layer 5 outside, outer insulation layer 5 is covered with braided shielding layer 6 outside, braided shielding layer 6 is covered with insulating wear-resistant outer sheath 7 outside, and insulating wear-resistant outer sheath 7 is printed with mark pattern 8 at the position corresponding to cutting peg 4 on surface, to facilitate determining the position of internal cutting peg 4 from outside;

[0021] Cutting peg 4 includes peg cap 41, flat peg 42 arranged on the side of peg cap 41 close to busbar 1 and perpendicular to the axis of busbar 1, and cutting edge 43 arranged on both sides of flat peg 42 corresponding to one end of busbar 1, the distance between peg cap 41 and the outer wall of outer insulation layer 5 is not less than half of the wall thickness of outer insulation layer 5, peg cap 41 is disc-shaped, and the side edge of peg cap 41 away from flat peg 42 is a rounded structure, there is at least a 1mm wide flat structure between the bottom of the cutting edges 43 on both sides of flat peg 42, to ensure that cutting peg 4 will not damage busbar 1 and semiconductor heating core band 2 when there is no external impact.

[0022] Working principle:

[0023] When it is necessary to cut the self-limiting temperature electric heating band, the mark pattern 8 near the cutting surface is extruded or hammered from the outside of the cut self-limiting temperature electric heating band, and the cutting peg 4 symmetrically arranged inside corresponding to the mark pattern 8 generates impact force on the busbar 1 and the semiconductor heating core band 2 to cause a cut, or the busbar 1 is cut off and a cut is caused on the semiconductor heating core band 2, so that the part of the busbar 1 and the semiconductor heating core band 2 near the cutting surface can be conveniently twisted and pulled off from the cutting surface by using pliers and other tools, so that a distance difference is formed between the busbar 1 and the semiconductor heating core band 2 and the braided shielding layer 6, and the busbar 1 and the semiconductor heating core band 2 will not be in contact with the braided shielding layer 6 to cause short circuit, achieving the effect of simpler and more secure insulation wrapping.

[0024] It is to be understood that the terminology "including", "comprising", or any other variation thereof, as used in the specification is intended to encompass the non-exclusive inclusion such that processes, methods, articles, or apparatuses that comprise a list of elements are not required to comprise only those elements but can include other elements not expressly listed or inherent to such processes, methods, articles, or apparatuses.

[0025] Although embodiments of the present application have been shown and described, it is to be understood that various modifications, substitutions, replacements and changes can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A self-regulating, medium-length, electric heating tape comprising two parallel busbars (1), characterized in that: The surfaces of the two busbars (1) and the position between the two busbars are provided with semiconductor heating core strips (2), the outside of the semiconductor heating core strips (2) is covered with an inner insulation layer (3), the inner insulation layer (3) is provided with cutting nails (4) equidistantly along the length direction, the cutting nails (4) are symmetrically arranged above and below the two busbars (1), the outside of the inner insulation layer (3) and the cutting nails (4) is covered with an outer insulation layer (5), the outside of the outer insulation layer (5) is covered with a braided shielding layer (6), the outside of the braided shielding layer (6) is covered with an insulation wear-resistant outer sheath (7), and the surface of the insulation wear-resistant outer sheath (7) is printed with a mark pattern (8) at the position corresponding to the cutting nails (4). The cutting nail (4) comprises a nail cap (41), a flat nail (42) arranged on the side of the nail cap (41) close to the busbar (1) and perpendicular to the axis of the busbar (1), and cutting edges (43) arranged on both sides of the flat nail (42) corresponding to one end of the busbar (1).

2. A self-regulating heating tape according to claim 1, wherein: The distance between the nail cap (41) and the outer wall of the outer insulation layer (5) is not less than half of the wall thickness of the outer insulation layer (5).

3. A self-regulating heating tape according to claim 1, wherein: The nail cap (41) is disc-shaped, and the side edge of the nail cap (41) away from the flat nail (42) is a rounded structure.

4. A self-regulating heating tape according to claim 1, wherein: The two side cutting edges (43) of the flat nail (42) have a plane structure with a width of at least 1mm between the bottoms of the two side cutting edges (43).

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