CN209250909U - A kind of electric heating tube of double insulation - Google Patents

Abstract

The utility model discloses a kind of electric heating tubes of double insulation, including shell, the upper end of the enclosure interior and the lateral surface interference fit of insulation fixed block, the lower end of insulation fixed block is fixedly connected with the upper end of insulation board, insulation fixed block lower space is divided into left and right two parts by insulation board, it is fixedly connected in the middle part of insulation board side lower end installing port and U-shaped resistance wire lower end, left and right ends are connect with the lower end of two electrodes respectively above U-shaped resistance wire, two electrodes are separately mounted in two mounting holes of insulation fixed block upper surface, around its axis, angularly there are four screw rods for fixation for the upper surface of shell, glass fabric reduces influence of the magnesia powder expanded by heating to thermal conductive shell, insulation board prevents U-shaped resistance wire short-circuit, heat conductive insulating ceramic coating and glass fabric improve the insulation performance of shell, the electricity of this double insulation Heating tube good insulation preformance, it is highly-safe；Rubber ring improves the waterproof performance between cover and housing.

Description

A kind of electric heating tube of double insulation

Technical field

The utility model relates to electric heating tube technical field, specially a kind of electric heating tube of double insulation.

Background technique

Existing electric heating tube resistance wire completely cuts off by the magnesia powder being added, and during filling and undergauge, is easy to produce The case where raw resistance wire is easy to wind together, causes short circuit or fracture of wire to scrap particularly with the lesser product of resistance wire diameter Rate is very high.

Utility model content

The technical problems to be solved in the utility model is to overcome existing defect, provides a kind of electric heating of double insulation Pipe, glass fabric reduce influence of the magnesia powder expanded by heating to thermal conductive shell, and insulation board prevents U-shaped resistance wire short-circuit, leads Thermal insulation ceramic coating and glass fabric improve the insulation performance of shell, the electric heating tube insulation performance of this double insulation It is good, it is highly-safe, improve the service life of double insulation electric heating tube；Rubber ring improves the waterproof performance between cover and housing, The problems in background technique can effectively be solved.

To achieve the above object, the utility model provides the following technical solutions: a kind of electric heating tube of double insulation, including Shell, the upper end of the enclosure interior and the lateral surface interference fit of insulation fixed block, the lower end for the fixed block that insulate and insulation board Upper end be fixedly connected, the insulation board fixed block lower space that will insulate is divided into left and right two parts, the installation of insulation board side lower end Mouthful and be fixedly connected in the middle part of U-shaped resistance wire lower end, above U-shaped resistance wire left and right ends respectively with the lower end of two electrodes company It connects, two electrodes are separately mounted in two mounting holes of insulation fixed block upper surface, and the upper surface of shell is around its axis isogonism Degree is fixed there are four screw rod, and screw rod passes through the perforation on cover board and connect with nut thread, and the middle position of cover board upper surface is opened Equipped with cable-through hole.

As a kind of optimal technical scheme of the utility model, the upper surface of the insulation fixed block is fixed with isolation board, Isolation board is located between two electrodes, the upper surface of isolation board and the following table face contact of cover board.

As a kind of optimal technical scheme of the utility model, rubber ring is equipped in the cable-through hole of the cover board upper surface, The lateral surface of rubber ring is equipped with annular protrusion, the annular groove clamping of annular protrusion and cable-through hole inner wall.

As a kind of optimal technical scheme of the utility model, the lower surface of the cover board is fixed with rubber ring, rubber ring Lateral surface and shell inner wall interference fit.

As a kind of optimal technical scheme of the utility model, the shell includes thermal conductive shell, the inner wall of thermal conductive shell It is coated with heat conductive insulating ceramic coating, is bonded with glass fabric on the inside of heat conductive insulating ceramic coating.

Compared with prior art, the utility model has the beneficial effects that the electric heating tube of this double insulation, glass fabric Influence of the magnesia powder expanded by heating to thermal conductive shell is reduced, insulation board prevents U-shaped resistance wire short-circuit, heat conductive insulating ceramic coating The insulation performance of shell is improved with glass fabric, the electric heating tube good insulation preformance of this double insulation is highly-safe；Rubber Ring improves the waterproof performance between cover and housing.

Detailed description of the invention

Fig. 1 is the utility model schematic view of the front view；

Fig. 2 is the utility model schematic diagram of housing structure.

In figure: 1 nut, 2 rubber rings, 3 perforation, 4 rubber rings, 5 electrodes, 6 insulation fixed blocks, 7 shells, 71 glass fibres Cloth, 72 heat conductive insulating ceramic coatings, 73 thermal conductive shells, 8 insulation boards, 9 isolation boards, 10 screw rods, 11 U-shaped resistance wires, 12 cover boards.

Specific embodiment

The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without making creative work Every other embodiment obtained, fall within the protection scope of the utility model.

The utility model provides a kind of technical solution referring to FIG. 1-2: a kind of electric heating tube of double insulation, including shell Body 7, shell 7 include thermal conductive shell 73, and the inner-wall spraying of thermal conductive shell 73 has heat conductive insulating ceramic coating 72, heat conductive insulating ceramics The inside of coating 72 is bonded with glass fabric 71, the lateral surface interference fit of the upper end inside shell 7 and insulation fixed block 6, It is filled with magnesia powder in the space of 7 interior insulation fixed block of shell, 6 lower section, the insulate lower end of fixed block 6 and the upper end of insulation board 8 It is fixedly connected, insulation 6 lower space of fixed block is divided into left and right two parts by insulation board 8.

It is fixedly connected in the middle part of 8 side lower end installing port of insulation board and 11 lower end of U-shaped resistance wire, 11 top of U-shaped resistance wire Left and right ends are connect with the lower end of two electrodes 5 respectively, and two electrodes 5 are separately mounted to two of insulation 6 upper surface of fixed block In mounting hole, the upper surface of insulation fixed block 6 is fixed with isolation board 9, and isolation board 9 is located between two electrodes 5, isolation board 9 The following table face contact of upper surface and cover board 12, around its axis, angularly there are four screw rod 10, screw rods 10 for fixation for the upper surface of shell 7 Perforation 3 on cover board 12 is simultaneously threadedly coupled with nut 1, and the lower surface of cover board 12 is fixed with rubber ring 4, rubber ring 4 it is outer The inner wall of side and shell 7 interference fit, rubber ring improve the waterproof performance between cover board 12 and shell 7, table on cover board 12 The middle position in face offers cable-through hole, is equipped with rubber ring 2 in the cable-through hole of 12 upper surface of cover board, two terminals of conducting wire are worn The round hole crossed on rubber ring 2 is connect with two electrodes 5 respectively, and the lateral surface of rubber ring 2 is equipped with annular protrusion, annular protrusion and The annular groove of cable-through hole inner wall is clamped so that the fixation in cable-through hole of rubber ring 2, rubber ring 2 improve conducting wire and cable-through hole it Between leakproofness, glass fabric 71 reduces influence of the magnesia powder expanded by heating to thermal conductive shell 73, and insulation board 8 prevents U-shaped 11 short circuit of resistance wire, heat conductive insulating ceramic coating 72 and glass fabric 71 improve the insulation performance of shell 7, this double insulation Electric heating tube good insulation preformance, it is highly-safe.

When in use: being filled with magnesia powder, two wiring of conducting wire in the space of 7 interior insulation fixed block of shell, 6 lower section Round hole on rubber ring 2 is held to connect respectively with two electrodes 5,11 heating power of U-shaped resistance wire, magnesia powder is heated meeting A degree of expansion is generated, glass fabric 71 reduces influence of the magnesia powder expanded by heating to thermal conductive shell 73, insulation board 8 The short circuit of U-shaped resistance wire 11 is prevented, heat conductive insulating ceramic coating 72 and glass fabric 71 improve the insulation performance of shell 7.

The utility model, glass fabric 71 reduce influence of the magnesia powder expanded by heating to thermal conductive shell 73, insulation board 8 The short circuit of U-shaped resistance wire 11 is prevented, heat conductive insulating ceramic coating 72 and glass fabric 71 improve the insulation performance of shell 7, this The electric heating tube good insulation preformance of double insulation, it is highly-safe；Rubber ring improves the waterproofness between cover board 12 and shell 7 Energy.

While there has been shown and described that the embodiments of the present invention, for the ordinary skill in the art, It is understood that these embodiments can be carried out with a variety of variations in the case where not departing from the principles of the present invention and spirit, repaired Change, replacement and variant, the scope of the utility model is defined by the appended claims and the equivalents thereof.

Claims (5)

1. a kind of electric heating tube of double insulation, including shell (7), it is characterised in that: the internal upper end of the shell (7) and absolutely The lateral surface of edge fixed block (6) is interference fitted, and the lower end of insulation fixed block (6) is fixedly connected with the upper end of insulation board (8), is insulated Insulation fixed block (6) lower space is divided into left and right two parts, insulation board (8) side lower end installing port and U-shaped resistance by plate (8) Silk is fixedly connected in the middle part of (11) lower end, and left and right ends connect with the lower end of two electrodes (5) respectively above U-shaped resistance wire (11) It connects, two electrodes (5) are separately mounted in two mounting holes of insulation fixed block (6) upper surface, and the upper surface of shell (7) is around it Axis is angularly fixed there are four screw rod (10), and screw rod (10) passes through the perforation (3) on cover board (12) and connects with nut (1) screw thread It connects, the middle position of cover board (12) upper surface offers cable-through hole.

2. a kind of electric heating tube of double insulation according to claim 1, it is characterised in that: the insulation fixed block (6) Upper surface be fixed with isolation board (9), isolation board (9) is located between two electrodes (5), the upper surface of isolation board (9) and cover board (12) following table face contact.

3. a kind of electric heating tube of double insulation according to claim 1, it is characterised in that: cover board (12) upper surface Cable-through hole in be equipped with rubber ring (2), the lateral surface of rubber ring (2) is equipped with annular protrusion, annular protrusion and cable-through hole inner wall Annular groove clamping.

4. a kind of electric heating tube of double insulation according to claim 1, it is characterised in that: the following table of the cover board (12) Face is fixed with rubber ring (4), the lateral surface of rubber ring (4) and the inner wall interference fit of shell (7).

5. a kind of electric heating tube of double insulation according to claim 1, it is characterised in that: the shell (7) includes leading Hot shell (73), the inner-wall spraying of thermal conductive shell (73) have heat conductive insulating ceramic coating (72), heat conductive insulating ceramic coating (72) Inside be bonded with glass fabric (71).