Metal plastic composite tube with thermoplastic tube end contact flange

A technology for connecting flanges and metal plastics, applied in the direction of pipeline connection layout, pipe/pipe joints/pipe fittings, pipes, etc., can solve the problems of disappearance of anti-corrosion function, inconvenient use, accelerated corrosion of fluid medium, etc., to increase reliability, increase Application properties, the effect of increasing corrosion resistance and thermal insulation properties

Inactive Publication Date: 2009-08-26
甘国工
0 Cites 9 Cited by

AI-Extracted Technical Summary

Problems solved by technology

However, since the linear expansion coefficient of the composite plastic layer and the metal pipe wall differs by an order of magnitude, the composite plastic layer and the metal pipe wall will have different thermal expansion and cold contraction length changes when used in projects with large changes in cold and hot environments. There will be a length difference between the plastic layer and the metal pipe wall. At the pipe end, the metal pipe wall will be exposed due to the shrinkage of the plastic layer, and the fluid medium will directly contact the metal pipe wall, resulting in corrosion of the pipe wall or corrosion at the joint flange, and finally the pipe net failure
Although we have made many technical improvements and implementation plans at the pipe end and the connection between the pipe end and the pipe fittings, it is easy to expose the metal pipe wall in the fluid medium because of the composite section of the metal pipe wall and the plastic layer at the pipe end. It is corroded, and after the plastic layer shrinks, a large amount of bare metal pipe walls are not only accelerated, but also the fluid medium is easily driven by pressure into the space between the inner wall of the metal pipe and the plastic composite layer, which makes the function of the composite pipe invalid and the anti-corrosion function disappears.
Therefore, the application of this type of composite pipe is greatly restricted, espe...
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Method used

Fig. 4 has provided embodiment of the present invention 4 figure. Embodiment 4 is basically the same as Embodiment 1. The difference is that the plastic outer layer 3 and the plastic inner layer 4 of the metal-plastic composite pipe 1 are heat-resistant non-crosslinked heat-resistant polyethylene (PE-RT), and the surface of the plastic outer layer 3 is covered with a foam insulation layer 8, The outermost layer of the thermal insulation layer is a waterproof and permeable quality dense layer 9. Used in hot water pipe network, energy saving.
Fig. 6 provides embodiment 6 figure of the present invention. In this embodiment 6, the two composite pipes 1 are connected together through the thermoplastic pipe end connecting flange 6 to form a pipe network through electric heating and melting of the end faces, because the thermoplastic pipe end connecting flange strengthens the metal skeleton to reinforce ...
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Abstract

The invention provides a metal plastic composite tube with a thermoplastic tube end contact flange. A cylindrical metal tube wall which can bear fluid pressure and does not have a hole and a composite tube wall which is at least compounded with the inner wall of the metal tube wall and is formed by at least one plastic layer are arranged in the metal plastic composite tube, wherein the composite tube wall on the end part of the metal plastic composite tube is provided with a plurality of holes; the holes are filled with thermoplastic plastics of the plastic layer of the tube wall with hot melt connecting performance; and the thermoplastic plastics cover the cylindrical metal tube wall through the holes and are in hot melt connection with at least one plastic layer compounded with the inner wall so as to form the thermoplastic tube end contact flange which has connecting function and bears axial tensile force of a pipeline. The tube end contact flange completely and tightly covers a plastic outer layer and a plastic inner layer of a metal framework reinforced plastic composite tube tip, a pipeline end surface and the cylindrical metal tube wall through the holes, firm and reliable in connection, non leakage and high mechanical strength of the connecting position, prevents the fluid from corroding the metal framework, and has long service life.

Application Domain

Rigid pipesPipe connection arrangements

Technology Topic

ThermoplasticEngineering +7

Image

  • Metal plastic composite tube with thermoplastic tube end contact flange
  • Metal plastic composite tube with thermoplastic tube end contact flange

Examples

  • Experimental program(9)

Example Embodiment

[0025] Example 1:
[0026] figure 1 The figure of this embodiment 1 is shown. The metal-plastic composite pipe 1 in this embodiment 1 has a cylindrical metal pipe wall 2 without holes (which can be a seamless steel pipe or other seamless metal pipe, or it can be longitudinally buttted or overlapped with aluminum or steel strips. The cylindrical metal frame formed by welding), the cylindrical metal pipe wall 2 has a high-density polyethylene plastic outer layer 3 and a plastic inner layer 4 respectively inside and outside the plastic inner layer of the composite pipe wall at the end of the metal plastic composite pipe There are many holes 5, and these holes 5 are filled with thermoplastic that has the ability of hot-melt connection with the plastic outer layer 3 and the plastic inner layer 4. The thermoplastic plastic wraps the cylindrical metal pipe wall through the holes and interacts with the plastic outer layer 3 and the plastic inner layer. Layer 4 is hot-melt connected to form a thermoplastic pipe end connecting flange 6 that has a connection function and can withstand the axial tension of the pipe. The cylindrical metal pipe wall 2 has no holes, and many holes 5 are processed at the end of the composite pipe. Using a forming mold, the thermoplastic plastic that can be thermally connected with the plastic layer in the composite pipe is pressed into the mold cavity by an injection molding machine or an injection molding machine. , So that the hot-melt plastic will fill many holes processed on the end of the tube in the cavity under pressure, and the hot-melt plastic will also heat-melt the plastic outer layer 3 and the plastic inner layer 4 of a certain length at the end. Connected as a whole to form a complete covering of the wall of a cylindrical metal pipe with a certain length at the end. After cooling and shaping, the formed thermoplastic pipe end connecting flange can be filled with many plastic columns in the many holes on the pipe wall. The pin and the plastic pipe wall with a certain tensile fracture area integrally connected with the inner and outer plastic wall by thermal melting can bear the axial tensile force that the composite pipe must bear after the composite pipe is connected as a pipe network. Since the thermoplastic pipe end connecting flange is used at the end of the metal-plastic composite pipe, the thermoplastic pipe end connecting flange can be made directly when the metal composite pipe is manufactured in the factory, which makes the on-site construction extremely convenient. The connecting flange completely tightly wraps the plastic outer layer and the plastic inner layer of the end of the metal frame reinforced plastic composite pipe and the pipe end surface. The connection is firm, reliable, and leak-free. The mechanical strength of the connection is high, and fluid is prevented from entering the metal frame. Corrosion to it, the pipeline has a long service life.

Example Embodiment

[0027] Example 2:
[0028] figure 2 A diagram of Example 2 of the present invention is shown. The second embodiment is basically the same as the first embodiment. The difference is that the metal-plastic composite pipe is a 90° composite pipe joint 7.

Example Embodiment

[0029] Example 3:
[0030] image 3 A diagram of Example 3 of the present invention is shown. The third embodiment is basically the same as the first embodiment. The difference is that there is no plastic outer layer in the metal-plastic composite pipe.

PUM

no PUM

Description & Claims & Application Information

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