CN2356837Y - Embedded plastic electric heating filament tube fitting - Google Patents

Abstract

The utility model discloses an embedded plastic electric heating filament tube fitting, which connects thermoplastic tube fittings. The utility model has the advantages of reasonable structure, oxidation resistance, mechanical damage resistance, reliable welding quality and visual observation. The pipelines which are connected by the utility model can be applied in fuel gas, water supply, petroleum, chemical engineering, mining, irrigation and drainage, and sewage discharge fields. The utility model can be applied in the thermal welding of plastic pipes, and is particularly suitable for different shapes of polypropylene tube fittings.

Description

Embedding bury type plastics heating wire pipe fitting

The utility model relates to a kind of conduit coupling, specifically, relates to a kind of heating wire connector that pipes consisting of thermoplastic plastics can be coupled together.

Traditional plastic conduit connected mode is that hot melt butt joint connects, and is to contact to fusion temperature with heating plate with the vertical corresponding surface of plastics tubular axis, two fusings mouthful is compressed connection again.But this connected mode causes the inside pipe wall flange owing to be subjected to adding hot extrusion, and the caliber part is reduced, and the flow resistance in the pore increases.And the hot melt butt joint is not suitable for the plastic conduit of bore less than 110mm; Simultaneously, the quality that connects of hot melt butt joint is subjected to working environment and artificial factor bigger.

It is the pullover connection of thermoplastic that present plastic pipe connects employed mode, by scope one heater coil is installed between the connection surface of the pullover connecting tube of thermoplasticity.Example has West Germany's specification of exhibition 1048106 or the like.But in the implementation process of some patents,, the quality problems of some serious thermal weldings can occur, influence the plastic tube welding reliability greatly owing to its hot melt connector unreasonable structure.In the prior art because usually exposed outside at the lip-deep heater coil of the connection of the pullover connecting tube of thermoplasticity, after after a while, oxidation takes place easily in the metal surface, the later pullover connecting tube of oxidation in use will produce local density poor, a series of problems such as residual deformation appear, influence the normal use of pipe fitting.Simultaneously, exposed heating wire is subjected to mechanical damage easily, also can influence the normal use of pipe fitting.In addition, the existing pullover connecting tube of great majority can not be judged the molten condition of material intuitively with the method for range estimation, can only grasp the welding situation of pipe fitting by experimental control conduction time.

The purpose of this utility model is the defective that exists in the above-mentioned prior art, the plastics heating wire pipe fitting that propose a kind of rational in infrastructure, resistance to oxidation, anti-mechanical damage, reliable welding quality, can intuitively observe, it can be applied in the thermal weld of plastic pipe, is particularly useful for difform polypropylene pipe fitting.

To achieve these goals, the present invention proposes a kind of embedding bury type plastics heating wire pipe fitting, this heating wire pipe fitting is the opening hollow component that thermoplastic constitutes, open interior is a cylinder-shaped sleeve, inner surface at cylinder-shaped sleeve is embedded into into the heating wire that is used to heat, used heating wire is conventional metallic conductor, and the length and the spacing of the coil of being made up of heating wire should get by calculating according to the resistance value of heating wire.Have two binding posts on the outer surface of heating wire pipe fitting at least, this binding post comprise the hollow cavity of connecting heating wire pipe fitting surfaces externally and internally and wherein with heat the binding post that heating wire joins.Be embedded at pipe fitting on the housing outer surface of heating wire, have one or several to observe indicator hole, be used for intuitively observing the quality of connection situation after the electric heating fusion welding.There is the position of one or several center fixation pin with fixing required weld-end fittings at inner surface middle part at the heating wire pipe fitting.

Describe the utility model in detail below in conjunction with accompanying drawing.

Fig. 1 is the schematic diagram of the utility model two logical type heating wire pipe fittings, it is an opening hollow component that is made of thermoplastic, open interior is a cylinder-shaped sleeve 1, be distributed with one group of heating wire that is used to heat 2 on the inner surface spirally, heating wire 2 is embedded in the inner surface of cylinder-shaped sleeve 1, on the outer surface of these two logical type heating wire pipe fittings, two or more binding posts 3 are arranged, 4, this binding post comprises the hollow cavity 8 that links to each other with heating wire pipe fitting outer surface and the binding post 6 that joins with heater strip wherein, be embedded at pipe fitting on the housing outer surface of heating wire 2, there is one or several to observe indicator hole 5, there is one or several center fixation pin 7 at inner surface middle part at this two logical type heating wire pipe fitting, with the position of fixing required weld-end fittings.Center fixation pin 7 is preferably four.

Heating wire described in the utility model can be the plain conductor of exposed plain conductor or cladding plastic insulating layer.

Heating wire pipe fitting described in the utility model is a kind of in two perfectly straight casts, the elbow with certain angle, triplet type, four-way type and the plug; In same heating wire pipe fitting, sleeve pipe is with the footpath, Different Diameter or reducing.

Purpose described in the utility model is achieved like this, with soldered plastic pipe, each port from the molten heating wire pipe fitting of electric heating inserts in it respectively, center fixation pin in the heating wire pipe fitting is located, and by the binding post on the heating wire pipe fitting wire coil is switched on, and makes it heating, under the effect that heat is transmitted, at first the resin near heating wire is heated and fusion on the heating wire pipe fitting, and causes volumetric expansion, and the resin of fusion subsequently begins to expand into the outer surface that tubing connects; Along with the increase of heat time heating time, the resin of pipe fitting and tubing joint face and melting layer presents molten state, and resin is converted into mobile phase by solid phase.Be energized to the stipulated time, interruptive current makes the joint face cooling, makes the resin of fusing change glassy state into, thereby reaches the purpose with the high-quality welding of plastic pipe.

Use the molten connection of electric heating of heating wire pipe fitting to finish welding by semi-automatic or full-automatic microcomputer control cabinet.By microcomputer control cabinet control welding process, natural environment and artificial factor are reduced greatly, have effect preferably to improving welding quality.

The heating wire pipe fitting is in welding process, be arranged in the observation indicator hole on the housing outer surface slowly jack-up of material, after finishing, welding stops, the material that overflow on the peep hole surface, help resin state with the methods analyst melting zone of range estimation, the degraded of resin whether occurs or decompose carbonization phenomenon, very convenient for the evaluation of the quality of interface.

Pipeline with the heating wire pipe fitting connects can be applicable in combustion gas, feedwater, oil, chemical industry, mining, irrigation and drainage, each field of sewage discharge.

In sum, the utility model compared with prior art has following advantage, at first, and the heater coil embedding Be embedded in the inner surface of heating wire pipe fitting, be embedded in the plastics, the position is fixed, and has rational distribution, Can not produce danger that heater strip moves and the possibility of hot-spot, welding quality is good, and reliability is strong; And, Heating wire is embedded into inner surface into the heating wire pipe fitting, can prevent since heating wire owing to be exposed in the air Oxidation or because mechanical damage and cause in welding process that local density is poor, the problem such as residual deformation occurs. Simultaneously, owing to be provided with the center steady pin in the heating wire pipe fitting, can make the pipe fitting that welds be easy to fix, no Generation departs from, and has protected welding quality. Observation indicator hole on the housing outer surface can intuitively be observed electric heating melting Quality of connection situation after the welding. In addition, because the variation in shape of heating wire pipe fitting enlarges greatly Its purposes.

Claims (9)

1. plastics heating wire pipe fitting, this heating wire pipe fitting is the opening hollow component that thermoplastic constitutes, open interior is cylinder-shaped sleeve (1), the pipe fitting inner surface is distributed with the heating wire (2) that is used to heat, two or more binding posts (3), (4) are arranged on the outer surface, and binding post (3), (4) comprise the hollow cavity (8) of connecting heating wire pipe fitting surfaces externally and internally and the binding post (6) that joins with heating wire wherein; It is characterized in that: wire (2) is embedded within the inner wall surface of cylinder-shaped sleeve (1); Be embedded at pipe fitting on the housing outer surface of heating wire (2), have one or several to observe indicator hole (5).

2. plastics heating wire pipe fitting according to claim 1 is characterized in that: described heating wire pipe fitting is one or two logical sleeve pipe, and it is shaped as the elbow of straight tube or certain angle.

3. plastics heating wire pipe fitting according to claim 1 is characterized in that: described heating wire pipe fitting is a triplet type sleeve pipe.

4. plastics heating wire pipe fitting according to claim 1 is characterized in that: described heating wire pipe fitting is a four-way molded cannula.

5. plastics heating wire pipe fitting according to claim 1 is characterized in that: described heating wire pipe fitting is a plug.

6. according to claim 2 or 3 or 4 described plastics heating wire pipe fittings, it is characterized in that: but each pipe fitting is same footpath, Different Diameter or reducing in a connection piece.

7. plastics heating wire pipe fitting according to claim 1 is characterized in that: described heating wire (2) is the plain conductor of exposed plain conductor or cladding plastic insulating layer.

8. plastics heating wire pipe fitting according to claim 1 is characterized in that: there is one or several center fixation pin (7) at the inner surface middle part of described heating wire pipe fitting.

9. plastics heating wire pipe fitting according to claim 8 is characterized in that: there are four center fixation pins (7) at the inner surface middle part of described heating wire pipe fitting.