CN102720901A - Electromagnetic induction welding steel-plastic composite pipe connection kit - Google Patents

Abstract

The invention discloses a connecting kit for electromagnetic induction welding of steel-plastic composite pipes. This composite pipe fitting includes: compound pipe, tubulose connecting piece and steel-plastic composite pipe cover, compound pipe includes: a non-magnetic or weak magnetic conductive metal layer and a plastic layer; at least one end of the tubular connecting piece is provided with an annular socket; when the composite pipe is inserted into the annular joint opening, the steel-plastic composite pipe sleeve is arranged between the composite pipe and the side wall of the annular joint opening; the side wall of the steel-plastic composite pipe sleeve is pre-embedded with a high magnetic conductive metal ring. The composite pipe of the composite pipe fitting adopts the non-magnetic or weak magnetic metal layer, and has no response or low response to medium-high frequency electromagnetic induction, the embedded steel-plastic composite pipe sleeve is arranged on the connecting piece, the magnetic metal material in the medium-high frequency electromagnetic induction steel-plastic composite pipe sleeve is adopted, the metal material generates heat, melts plastic and enables the pipe and the pipe fitting to be tightly combined into a whole, and the scheme provides the electromagnetic induction fusion connection possibility of the composite pipe which takes the non-magnetic or weak magnetic metal as the enhancement layer.

Description

Electromagnetic induction welding steel-plastic composite pipe connection kit

technical field

The invention relates to the field of steel-plastic composite pipe fittings, in particular to an electromagnetic induction welding steel-plastic composite pipe connection kit.

Background technique

In the prior art, for plastic-metal composite pipes formed by extrusion molding of thermoplastics, mechanical connection and hot-melt connection are generally used for the installation of pipe fittings. An effective and reliable method of hot-melt connection is electromagnetic induction welding , that is, first insert the composite tube containing the magnetic metal layer into the receiving end of the thermoplastic connector, and use the electromagnetic induction device to make the magnetic metal layer of the composite tube controllably heat and melt the receiving end of the thermoplastic connector, so that indirectly Heating the plastic makes it melt and melt into one, so as to achieve the purpose of hot-melt connection of composite pipes and connectors.

But it should be noted that the current metal materials mainly used in composite pipes include: steel (iron), aluminum, aluminum alloy, and stainless steel. In addition to steel (iron) with good magnetic permeability, aluminum and aluminum alloys are often used for water supply The 304 stainless steel used for the purpose is a low magnetic permeability material, which does not respond or has a weak response to electromagnetic induction, so it is impossible to use medium and high frequency induction heating technology to heat aluminum, aluminum alloy and 304 stainless steel and other non-magnetic or weak magnetic permeability metals. big.

Contents of the invention

The present invention aims to overcome the defects in the above-mentioned prior art, and provides an electromagnetic induction welding steel-plastic composite pipe connection kit with high efficiency, reliability, firm connection, strong pressure resistance, good sealing performance, high installation efficiency and wide application range.

In order to achieve the above purpose, according to the present invention, an electromagnetic induction fusion steel-plastic composite pipe connection kit is provided, including: a composite pipe, a tubular connector and a steel-plastic composite pipe sleeve, and the composite pipe includes: a non-magnetic or weakly magnetically conductive metal layer and a plastic layer; the two ends of the tubular connector are respectively provided with ring-shaped sockets; when the composite pipe is inserted into the ring-shaped socket, the steel-plastic composite pipe sleeve is arranged between the composite pipe and the side wall of the ring-shaped socket ; The side wall of the steel-plastic composite pipe sleeve is pre-embedded with a high magnetic permeability metal ring.

In the above technical solution, one end of the steel-plastic composite pipe sleeve is provided with a ring-shaped fusion joint that is fit and plugged with the composite pipe.

In the above technical solution, the arrangement of the non-magnetic or weakly conductive metal layer and the plastic layer of the composite pipe is: the non-magnetic or weakly conductive metal layer is the outer layer, and the plastic layer is the inner layer; or the non-magnetic or weakly conductive metal layer is the inner layer; The magnetic metal layer is the inner layer, and the plastic layer is the outer layer; or the non-magnetic or weakly magnetic-permeable metal layer is located between the two plastic layers.

In the above technical solution, a hot-melt adhesive is also provided between the non-magnetic or weakly magnetically conductive metal layer and the plastic layer.

In the above technical solution, the non-magnetic or weakly magnetic conductive metal layer is 304 stainless steel, aluminum or aluminum alloy.

In the above technical solution, the high magnetic permeability metal ring includes: a large high magnetic permeability metal ring and a small high magnetic permeability metal ring. It is arranged on the outer side of the inner wall of the annular melting joint.

In the above technical solution, the high magnetic permeability metal ring is made of ferrous material.

In the above technical solution, the iron material is a punched iron ring, a spiral iron wire or a welded steel wire mesh with holes.

In the above technical solution, the plastic material of the steel-plastic composite pipe sleeve is a hot-melt adhesive suitable for fitting the composite pipe and the tubular connector.

Compared with the prior art, the present invention has the following beneficial effects: the composite pipe of the electromagnetic induction fusion steel-plastic composite pipe connection kit of the present invention does not respond or is weak to medium and high frequency electromagnetic induction due to the use of non-magnetic or weak magnetic conductive metal layers. Response, medium and high frequency electromagnetic induction heating method cannot be used for thermal fusion connection, and electromagnetic welding is realized by pre-embedding a small section of high magnetic permeability metal ring in the pipe sleeve; at the same time, the inner and outer sides of the composite pipe wall are simultaneously connected with the ring Shaped welded joints are welded, which greatly improves the firmness and tightness of the connection; in addition, the composite pipe fittings have strong pressure resistance, good sealing performance, easy to use, and a wide range of applications, especially for composite pipes with small inner diameters. Especially strong, especially good sealing, especially strong pressure resistance.

Description of drawings

Fig. 1 is a three-dimensional exploded schematic diagram of the electromagnetic induction fusion steel-plastic composite pipe connection kit of the present invention;

Fig. 2 is a schematic cross-sectional structural view of the connecting piece of the electromagnetic induction welding steel-plastic composite pipe connecting kit of the present invention;

3 is a schematic cross-sectional structural view of the first embodiment of the sleeve of the electromagnetic induction fusion steel-plastic composite pipe connection kit of the present invention;

Fig. 4 is a schematic cross-sectional structural view of the second embodiment of the sleeve of the electromagnetic induction welding steel-plastic composite pipe connection kit of the present invention;

Fig. 5, Fig. 6 and Fig. 7 are schematic cross-sectional views of three structures of the composite pipe of the electromagnetic induction welding steel-plastic composite pipe connection kit of the present invention;

Fig. 8 is a schematic diagram of the assembly structure of the electromagnetic induction welding steel-plastic composite pipe connection kit of the present invention;

Fig. 9 is a schematic diagram of the enlarged structure of part A of Fig. 8;

Fig. 10 is a schematic cross-sectional structural view of the flaring-treated composite pipe of the electromagnetic induction fusion steel-plastic composite pipe connection kit of the present invention;

In conjunction with the accompanying drawings, the following reference numerals are marked thereon:

1-composite tube, 11-non-magnetic or weakly magnetic metal layer, 12-plastic layer, 13-flared tube, 2-connector, 24-ring socket, 31-thermoplastic body, 32-big height Magnetic metal ring, 33-small high magnetic metal ring, 34-annular fusion interface.

Detailed ways

A specific embodiment of the present invention will be described in detail below in conjunction with the accompanying drawings, but it should be understood that the protection scope of the present invention is not limited by the specific embodiment.

As shown in FIG. 1 , the electromagnetic induction welding steel-plastic composite pipe connection kit of the present invention includes: a composite pipe 1 , a connecting piece 2 and a pipe sleeve 3 . The composite pipe 1 includes: a non-magnetic or weakly magnetically conductive metal layer 11 and a plastic layer 12, and the non-magnetically or weakly magnetically conductive metal layer 11 is 304 stainless steel, aluminum or aluminum alloy. Wherein, the non-magnetic or weakly magnetically conductive metal layer 11 is the outer layer, and the plastic layer 12 is the inner layer (as shown in Figure 5); or the non-magnetically conductive or weakly magnetically conductive metal layer 11 is the inner layer, and the plastic layer 12 is the outer layer layer (as shown in FIG. 6 ); the non-magnetic or weakly magnetically permeable metal layer 11 may also be located between two plastic layers 12 (as shown in FIG. 7 ). The relative positions of the non-magnetic or weakly magnetically permeable metal layer 11 and the plastic layer 12 are flexible, and are not limited to the non-magnetically or weakly magnetically permeable metal layer 11 being located on the outer layer.

As shown in FIG. 2 , the connector 2 is tubular, and the left and right ends are respectively provided with axially extending annular sockets 24 .

As shown in FIG. 3 , the sleeve 3 is tubular, and its specific structure includes: a thermoplastic body 31 fit and plugged into the annular socket 24 , a large metal ring 32 with high magnetic permeability and a small metal ring 33 with high magnetic permeability. Wherein, the left end of the thermoplastic body 31 is provided with an axially extending annular fusion joint 34 , and the composite pipe 1 is fitted and inserted into the annular fusion joint 34 . The material of the large high magnetic permeability metal ring 32 and the small high magnetic permeability metal ring 33 is a magnetic metal, and the large high magnetic permeability metal ring 32 is pre-embedded and arranged on the inner side of the outer wall of the annular melting joint 34, and the small high magnetic permeability metal ring 33 is pre-embedded. It is buried outside the inner wall of the annular fusion joint 34 .

As shown in Figure 4, the pipe sleeve 3 is tubular, and the specific structure may also include: a thermoplastic body 35 and a high magnetic permeability metal ring 36 pre-embedded in the thermoplastic body 35; when assembling, one pipe sleeve 3 is used, and the Between the inner wall of the composite pipe 1 and the inner wall of the annular socket 24 of the connector 2 or between the outer wall of the composite pipe 1 and the outer wall of the annular socket 24 of the connector 2; Between the inner wall of 1 and the inner wall of the annular socket 24 of the connector 2 or between the outer wall of the composite pipe 1 and the outer wall of the annular socket 24 of the connector 2.

As shown in Figure 8, when the electromagnetic induction welding steel-plastic composite pipe connection kit of this embodiment is in use, first insert one end of the composite pipe 1 into the annular fusion joint 34 of the sleeve 3, so that the pipe wall of the composite pipe 1 is located Between the large high magnetic permeability metal ring 32 and the small high magnetic permeability metal ring 33 . Then, the sleeve 3 inserted with the composite pipe 1 is inserted as a whole into the ring-shaped socket 24 of the connector 2, and then the electromagnetic induction generating device is arranged near the ring-shaped socket 24 at the connection end. , the medium and high frequency electromagnetic oscillating waves generated by the welding machine can make the large high-permeability metal ring 32 and the small high-permeability metal ring 33 of the pipe sleeve 3 controllably heat and melt the pipe wall of the pipe sleeve 3, so that the composite pipe 1 can pass through the pipe sleeve 3 firmly. Firmly fixed on the connecting piece 2, sealed and connected. As shown in FIG. 9 , since the inner and outer sides of the pipe wall of the composite pipe 1 are fused with the annular fusion joint 34 of the sleeve 3 at the same time, the firmness and sealing of the connection are greatly improved.

When two composite pipes are used to connect, the composite pipe 1 at the other end is also connected to the connector 2 through the sleeve 3 according to the above-mentioned steps, and the electromagnetic induction generating device is also arranged on the annular socket 24 of the other connection end. The accessories, through the high-frequency electromagnetic oscillating wave generated by the electromagnetic induction generating device, make it welded to the connecting piece 2 through the sleeve 3, so that the two composite pipes are connected through the connecting piece 2.

As shown in Figure 10, for composite pipes 1 with smaller pipe diameters, flared pipes 13 suitable for connection can be obtained after flaring treatment. If the fusion interface 34 is compatible, the connector of the present application can be used to connect it.

The composite pipe of the electromagnetic induction welding steel-plastic composite pipe connection kit of the present invention adopts a non-magnetic or weak magnetic-conductive metal layer, and only a small section of high-magnetic-permeability metal ring is embedded in the pipe sleeve, so that the electrical conductivity of this type of composite pipe Magnetic induction welding becomes possible; at the same time, the inner and outer sides of the pipe wall of the composite pipe are fused with the annular fusion joint of the sleeve at the same time, which greatly improves the firmness and sealing of the connection; in addition, the composite pipe has strong pressure resistance and good sealing , easy to use, wide application range, especially for composite pipes with small inner diameters, the fastening is particularly firm, the sealing performance is particularly good, and the pressure resistance is particularly strong.

The above disclosures are only a few specific embodiments of the present invention, however, the present invention is not limited thereto, and any changes conceivable by those skilled in the art shall fall within the protection scope of the present invention.

Claims (9)

1. an electromagnetic inductive welding steel-plastic composite pipe connects external member, it is characterized in that, comprising: composite pipe, tubular connection and steel-plastic composite pipe cover, and said composite pipe comprises: not magnetic conduction or weak magnetic conductive metal layer and plastic layer; At least one end of said tubular connection offers the ring-type birdsmouth; When said composite pipe was pegged graft into said ring-type birdsmouth, said steel-plastic composite pipe was set between the sidewall of said composite pipe and said ring-type birdsmouth; The sidewall of said steel-plastic composite pipe cover is pre-buried to be provided with high magnetic conductive metal ring.

2. electromagnetic inductive welding steel-plastic composite pipe according to claim 1 connects external member, it is characterized in that, an end of said steel-plastic composite pipe cover offers the ring-type welding mouth with the adaptive grafting of said composite pipe.

3. electromagnetic inductive welding steel-plastic composite pipe according to claim 1 connects external member, and it is characterized in that being arranged as of the not magnetic conduction of said composite pipe or weak magnetic conductive metal layer and plastic layer: magnetic conduction or weak magnetic conductive metal layer are skin, and plastic layer is an internal layer; Perhaps magnetic conduction or weak magnetic conductive metal layer are not internal layer, and plastic layer is outer; Perhaps not magnetic conduction or weak magnetic conductive metal layer between the two layers of plastic layer.

4. electromagnetic inductive welding steel-plastic composite pipe according to claim 1 connects external member, it is characterized in that, also is provided with bonding PUR between said not magnetic conduction or weak magnetic conductive metal layer and the plastic layer.

5. electromagnetic inductive welding steel-plastic composite pipe according to claim 1 connects external member, it is characterized in that said not magnetic conduction or weak magnetic conductive metal layer are 304 stainless steels, aluminum or aluminum alloy.

6. connect external member according to each described electromagnetic inductive welding steel-plastic composite pipe in the claim 1 to 5; It is characterized in that; Said high magnetic conductive metal ring comprises: big high magnetic conductive metal ring and little high magnetic conductive metal ring; The pre-buried outer wall inboard that is arranged on said ring-type welding mouth of said big high magnetic conductive metal ring, the pre-buried inner wall that is arranged on said ring-type welding mouth of said little high magnetic conductive metal ring.

7. electromagnetic inductive welding steel-plastic composite pipe according to claim 1 connects external member, it is characterized in that the material of said high magnetic conductive metal ring is a ferrous material.

8. electromagnetic inductive welding steel-plastic composite pipe according to claim 7 connects external member, it is characterized in that, said ferrous material is iron hoop, helical iron wire or the steel wire welded mesh with holes of punching.

9. electromagnetic inductive welding steel-plastic composite pipe according to claim 1 connects external member, it is characterized in that, the plastic materials of said steel-plastic composite pipe cover is for being fit to said composite pipe and the adaptive PUR of tubular connection.

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