CN102829276B - Electromagnetic induction heating type steel-plastic composite pipeline full fusion welding structure - Google Patents

Abstract

The invention discloses an electromagnetic induction full heating type steel-plastic composite pipeline connecting structure. The connecting structure comprises a wave-shaped lining ring, a pure plastic pipe fitting, and a steel-plastic composite pipe material with an inner plastic pipe layer, wherein the pure plastic pipe fitting is provided with an outer ring part, an annular bearing and inserting cavity, an inner ring body segment and an inner ring expanding segment; the steel-plastic composite pipe material is inserted into the annular bearing and inserting cavity; a transition step is formed by the inner ring body segment and the inner ring expanding segment; an electromagnetic induction coil wrapped at the outer ring part is used for the fusion welding of the steel-plastic composite pipe material and the pure plastic pipe fitting; the free end of the lining ring leaned against the inner wall of an inner ring part is positioned outside the end part of the inner ring expanding segment; a gap exists between the free end of the lining ring and the inner wall of the adjacent inner plastic pipe layer; fused plastic accumulated in a fused material placing space carries out the fusion welding for the end part of the inner ring expanding segment and the inner wall of the steel-plastic composite pipe material together in a sealing manner after being condensated; and the sum of the wall thickness of the inner ring expanding segment and the wall thickness of the inner plastic pipe layer is from 3mm to 20mm. According to the invention, reliable and gapless fusion welding in a tight sealing manner can be formed between the steel-plastic composite pipe material and the inner ring part, so that the seepage phenomenon between the steel-plastic composite pipe material and the inner ring part is avoided.

Description

The abundant welding structure of electromagnetic induction heating type composite metal plastic pipe

[technical field]

The present invention relates to a kind of electromagnetic induction heating type composite metal plastic pipe welding structure, especially relate to the abundant welding structure of a kind of electromagnetic induction heating type composite metal plastic pipe, belong to conduits fused technical field.

[background technique]

In the construction of pipework, especially for supply water and the construction of the piping network of air feed in, people use more and more take the steel-plastic composite pipe that steel pipe is base tube, thereby by pure plastic pipe part electromagnetic welding, connect and form pipeline between steel-plastic composite pipe, steel-plastic composite pipe integrates high pressure resistant, anticorrosion and resistance oxygen, this emerging tubing is the upgrading regeneration product of traditional galvanized pipe, thermoplastic pipes.

In prior art, steel-plastic composite pipe is difficult to real realization with the internal ring portion of pure plastic pipe part and forms tightening seal welding, inevitably there is welding gap with the internal ring portion of pure plastic pipe part in steel-plastic composite pipe, thereby there is Seepage, and lose in circle situation when pure plastic pipe part exists, it is larger that welding gap will become.

How impelling reliable seamless tightening seal welding between steel-plastic composite pipe and the internal ring portion of pure plastic pipe part, is a large technical barrier of pipeline industry in fact, and claimant is through unremitting effort with great concentration, and the application's case is due to generation.

[summary of the invention]

For the existing deficiency of above-mentioned prior art, the invention provides the abundant welding structure of a kind of electromagnetic induction heating type composite metal plastic pipe, between the internal ring portion of its steel-plastic composite pipe and pure plastic pipe part, can form the seamless tightening seal welding of high reliability, the generation of having stopped Seepage.

Technological scheme of the present invention is achieved in that the abundant welding structure of electromagnetic induction heating type composite metal plastic pipe, comprise pure plastic pipe part and there is outer plastic pipe layer, middle steel pipe layer, the steel-plastic composite pipe of interior plastic pipe layer, described pure plastic pipe part has at least one internal ring portion, outer portion and be formed on the annular socket joint chamber between described internal ring portion and outer portion, described steel-plastic composite pipe is plugged in described annular socket joint chamber, described internal ring portion has interior ring body section, interior ring extension diameter section and the transition shoulder that is formed at both adjoiners, at described outer portion peripheral ring, around the formed alternating magnetic field of electromagnetic induction coil of arranging, steel-plastic composite pipe is connected with pure plastic pipe part hot melt, its improvement is: the lining ring that also comprises undulate, lining ring is conflicted and is arranged at the inwall of internal ring portion, its free end is positioned at outside the end of described ring extension diameter section, and leave gap with contiguous interior plastic pipe layer inwall, lining ring adopts stainless steel or copper material to make, the interior plastic pipe layer inwall of described vicinity, space sum that the formed space, end of the free end of lining ring and interior ring extension diameter section and lining ring and interior ring extension diameter section form is common forms the melt containing space when gathering hot melt and be connected of an intercommunication, the wall thickness sum of the wall thickness of described interior ring extension diameter section and interior plastic pipe layer is 3mm～20mm.

The end of above-mentioned interior ring extension diameter section is step-like, and above-mentioned lining ring is conflicted and is arranged at the inwall of interior ring extension diameter section, and its free end is positioned at outside the stepped end of ring extension diameter section, and its bottom end is inconsistent with transition shoulder.

Step-like object is arranged in the end of interior ring extension diameter section: when melting, be conducive to guide to melt containing space by being positioned at the unnecessary plastic melting melting material in annular socket joint chamber.

Above-mentioned plastics outer portion has and is positioned at the annular ledge of its end and annular ledge annular protrusion separately therewith, between annular ledge and annular protrusion, forms annular groove, and above-mentioned electromagnetic induction coil is arranged in this annular groove.

Tool of the present invention has the following advantages and beneficial effect:

When the wall thickness of interior ring extension diameter section and the wall thickness sum of interior plastic pipe layer surpass 20mm, the internal ring portion of steel-plastic composite pipe and pure plastic pipe part makes will inevitably produce welding gap between the two owing to being difficult to welding, pipeline in use there will be Seepage, especially when pure plastic pipe part exists in the situation of losing circle (such as manufacturing the defect forming), it is larger that welding gap will become, and is more difficult to guarantee realize between steel-plastic composite pipe and the internal ring portion of pure plastic pipe part reliable seamless sealing welding, when the wall thickness of interior ring extension diameter section and the wall thickness sum of interior plastic pipe layer are less than 3mm, cause the wall thickness of pure plastic pipe part internal ring portion excessively thin, this will have influence on the intensity of pure plastic pipe part, and can produce super amount unnecessary plastic melting melting material, accordingly, electromagnetic induction coil is that 3mm～20mm is more favourable to the distance of middle steel pipe layer, this is technical know-how, not only the intensity of pure plastic pipe part is fully guaranteed, even there is slight mistake in circle situation at pure plastic pipe part, still can guarantee reliable seamless sealing welding between steel-plastic composite pipe and the internal ring portion of pure plastic pipe part.

The setting of lining ring, after it is heated, produces and expand, play the effect of the interior ring extension diameter section of supported thin wall structure, can limit interior ring extension diameter section undergauge, especially the formed melt containing space of lining ring extension design, excretion space is provided to the unnecessary plastic melting melting material in annular socket joint chamber, this not only makes can not pile up molten knurl in the annular socket joint chamber in fusion process, and accumulate in the unnecessary plastic melting melting material of melt containing space, ring extension diameter section end and hermetica seal between corresponding steel-plastic composite pipe inwall with it in after condensation, improved this stifled oozing, the sealing of leak stopping both port of origination (source), thereby guaranteed on the whole pipe electromagnetic welding quality, fluid sealability in pipeline is good.

[accompanying drawing explanation]

Fig. 1 is structural representation of the present invention, wherein, the electromagnetic welding tool with electromagnetic induction coil has been installed in the annular groove of pure plastic pipe part.

[embodiment]

As shown in Figure 1, the abundant welding structure of electromagnetic induction heating type composite metal plastic pipe, comprises the steel-plastic composite pipe 1 that is arranged at lining ring 4, the pure plastic pipe part 2 of internal ring portion and has outer plastic pipe layer 11, middle steel pipe layer 12, interior plastic pipe layer 13.

Pure plastic pipe part 2 has at least one internal ring portion, outer portion 21 and be formed on described internal ring portion and outer portion 21 between (shown in figure is that pure plastic pipe part 2 is two-way pure plastic pipe part in annular socket joint chamber 20, certainly can also be threeway pure plastic pipe part, four-way pure plastic pipe part etc.), steel-plastic composite pipe 1 is plugged in annular socket joint chamber 20, internal ring portion has interior ring body section L2, interior ring extension diameter section L1 and the transition shoulder 22 that is formed at both adjoiners, the wall thickness of interior ring body section L2 is thicker, the wall thickness of interior ring extension diameter section L1 is thinner, the end of interior ring extension diameter section L1 at least forms a step W (W is stepped for the present embodiment step), outer portion 21 has and is positioned at the annular ledge 211 of its end and annular ledge 211 annular protrusion 212 separately therewith, between annular ledge 211 and annular protrusion 212, form annular groove 210, wherein, electromagnetic welding tool 3 with electromagnetic induction coil 31 is installed in this annular groove 210, for electromagnetic melting band tool, (patent No. of applying on January 19th, 2012 referring to claimant is 201220027193.6 to electromagnetic welding tool 3 in the present embodiment, patent is called electromagnetic melting band tool).

Depart from outside the corresponding end of electromagnetic induction coil 31 bottom, chamber in annular socket joint chamber 20, being plugged on interior steel-plastic composite pipe 1 end, annular socket joint chamber 20 also departs from outside the corresponding end of electromagnetic induction coil 31, so be conducive in the fusion process after pegging graft, the grafting end of steel-plastic composite pipe 1 there will not be horizontal axis off normal.

The wall thickness sum L0 of the wall thickness of interior ring extension diameter section L1 and interior plastic pipe layer 13 is 3mm～20mm.

Lining ring 4 undulates, its conflict is arranged at the inwall of internal ring portion, for convenience of fixing lining ring 4, the crest 4U of lining ring 4 is touched mutually with the inwall of interior ring extension diameter section L1, the bottom end 41 of lining ring 4 contacts on transition shoulder 22, the free end 42 of lining ring 4 surpasses the stepped end of interior ring extension diameter section L1, it is the total length that the total length of lining ring 4 is greater than interior ring extension diameter section L1, and in the free end 42 of lining ring 4 is contiguous, the inwall of plastic pipe layer 13 (but does not contact with the inwall of interior plastic pipe layer 13, during concrete enforcement, the free end 42 of lining ring 4 is crooked towards pure plastic pipe part 2 center lines), the space that interior ring extension diameter section L1 end partly forms with the trough of corresponding lining ring 4, add the free end 42 of lining ring 4 and contiguous interior plastic pipe layer 13 inwalls, the formed space of interior ring extension diameter section L1 surrounds a melt containing space P when gathering hot melt and connect jointly, outer shroud week at steel-plastic composite pipe 1 makes steel-plastic composite pipe 1 heating around the formed alternating magnetic field of electromagnetic induction coil 31 of arranging, steel-plastic composite pipe 1 is just connected with pipe fitting 2 hot melts, in fusion process, after lining ring 4 is heated, produces and expand, the interior ring extension diameter section L1 of effective supported thin wall structure, and unnecessary plastic melting melting material in annular socket joint chamber 20 is under the guiding of the step W of interior ring extension diameter section L1, take advantage of a situation and flow in melt containing space P, accumulate in the unnecessary plastic melting melting material of melt containing space P after condensation: realized interior ring extension diameter section L1 end and the hermetica seal between corresponding steel-plastic composite pipe 1 inwall with it, improved this stifled oozing, the sealing of leak stopping both port of origination (source), after hot melt connects, steel-plastic composite pipe 1 just and between the internal ring portion of pure plastic pipe part 2, form reliable seamless sealing welding.

Lining ring 4 adopts stainless steel or copper material to make.

The present invention specifically assembles, during welding, choosing external diameter is 50mm, internal diameter is the steel-plastic composite pipe 1 of 40mm, the wall thickness of outer plastic pipe layer 11 is 1.5mm, the wall thickness of middle steel pipe layer 12 is 0.6mm, the wall thickness of interior plastic pipe layer 13 is 2.9mm, choose pure plastic pipe part 2, making ring body section L2 wall thickness in it is 4mm, interior ring extension diameter section L1 wall thickness is 3.5mm, in advance at the interior installation lining ring 4 of pure plastic pipe part 2, the bottom end 41 of lining ring 4 is contacted on transition shoulder 22, the free end 42 of lining ring 4 leaves gap with contiguous interior plastic pipe layer 13 inwalls, then steel-plastic composite pipe 1 and pure plastic pipe part 2 can be plugged in together, make the insertion section of steel-plastic composite pipe 1 be positioned at annular socket joint chamber 20, then electromagnetic welding tool 3 is installed in annular groove 210, and contact a311, contact b312 is connected in electromagnetic induction heater (not shown), start alternating current generator, inductor coil 3 forms alternating magnetic field, when passing middle steel pipe layer 12, the alternation magnetic line of force of alternating magnetic field produces countless little eddy current, middle steel pipe layer 12 is heating rapidly just, the outer plastic pipe layer 11 of steel pipe layer 12 both sides in the middle of making, the abundant melting of interior plastic pipe layer 13, cooling rear steel-plastic composite pipe 1 just with the internal ring portion of pure plastic pipe part 2, outer portion 21 weldings.

Claims (3)

1. the abundant welding structure of electromagnetic induction heating type composite metal plastic pipe, comprise pure plastic pipe part and there is outer plastic pipe layer, middle steel pipe layer, the steel-plastic composite pipe of interior plastic pipe layer, described pure plastic pipe part has at least one internal ring portion, outer portion and be formed on the annular socket joint chamber between described internal ring portion and outer portion, described steel-plastic composite pipe is plugged in described annular socket joint chamber, described internal ring portion has interior ring body section, interior ring extension diameter section and the transition shoulder that is formed at both adjoiners, at described outer portion peripheral ring, around the formed alternating magnetic field of electromagnetic induction coil of arranging, steel-plastic composite pipe is connected with pure plastic pipe part hot melt, it is characterized in that: the lining ring that also comprises undulate, lining ring is conflicted and is arranged at the inwall of internal ring portion, its free end is positioned at outside the end of described ring extension diameter section, and leave gap with contiguous interior plastic pipe layer inwall, lining ring adopts stainless steel or copper material to make, the interior plastic pipe layer inwall of described vicinity, space sum that the formed space, end of the free end of lining ring and interior ring extension diameter section and lining ring and interior ring extension diameter section form is common forms the melt containing space when gathering hot melt and be connected of an intercommunication, the wall thickness sum of the wall thickness of described interior ring extension diameter section and interior plastic pipe layer is 3mm～20mm.

2. the abundant welding structure of electromagnetic induction heating type composite metal plastic pipe according to claim 1, it is characterized in that: the end of described interior ring extension diameter section is step-like, described lining ring is conflicted and is arranged at the inwall of interior ring extension diameter section, its free end is positioned at outside the stepped end of ring extension diameter section, and its bottom end is inconsistent with transition shoulder.

3. the abundant welding structure of electromagnetic induction heating type composite metal plastic pipe according to claim 1 and 2, it is characterized in that: described plastics outer portion has and is positioned at the annular ledge of its end and annular ledge annular protrusion separately therewith, between annular ledge and annular protrusion, form annular groove, described electromagnetic induction coil is arranged in this annular groove.