Metal-plastic composite pipe

Abstract

The utility model discloses a metal-plastic composite pipe, comprising a plastic pipe, an intermediate layer and a metal pipe connected in sequence from the inside to the outside, the plastic pipe and the metal pipe are bonded together through the intermediate layer, the intermediate layer comprises a metal mesh and a hot melt adhesive, the metal mesh is a mesh structure formed by connecting a plurality of metal wires, and the hot melt adhesive is filled in the mesh of the metal mesh. The metal mesh of the utility model is a mesh structure, the hot melt adhesive is filled in the mesh of the metal mesh, and part of the metal wire is even immersed in the hot melt adhesive, so that the contact area between the metal mesh and the hot melt adhesive is large, and then the bonding force between the metal mesh and the hot melt adhesive is large, and the hot melt adhesive simultaneously bonds the outer wall of the plastic pipe and the inner wall of the metal pipe. Compared with the traditional composite pipe without a metal mesh, the adhesion of the plastic pipe is greatly improved, and the delamination phenomenon between the inner lining of the plastic pipe and the outer pipe due to the linear expansion coefficient is greatly reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of composite pipes, in particular to a metal-plastic composite pipe. Background Art

[0002] Metal-plastic composite pipe is a pipe with a metal pipe as the outer layer and a plastic pipe as the inner layer, which is formed by a certain process. It has the advantages of metal pipes and non-metal pipes. When compounding, the inner plastic pipe needs to be close to the outer metal pipe, and then the inner plastic pipe and the outer metal pipe are bonded together by heating. However, the linear expansion coefficients of metal pipes and plastic pipes are very different. Generally, the linear expansion coefficient of metal is much smaller than that of plastic. This leads to the overall smaller diameter of metal-plastic composite pipes at present, and the maximum diameter is basically around 500mm. Because the larger the diameter, the greater the absolute shrinkage of the plastic pipe with the same linear expansion coefficient, which makes the plastic pipe and the outer metal pipe easier to delaminate. Utility Model Content

[0003] In view of the above-mentioned problems existing in the prior art, the purpose of the utility model is to provide a metal-plastic composite, in which the metal mesh is in a mesh structure, hot melt adhesive is filled in the grid of the metal mesh, and part of the metal wire is even immersed in the hot melt adhesive, so that the contact area between the metal mesh and the hot melt adhesive is larger, and thus the bonding force between the metal mesh and the hot melt adhesive is greater. The hot melt adhesive simultaneously bonds the outer wall of the plastic pipe and the inner wall of the metal pipe. Compared with the traditional composite pipe without metal mesh, the adhesion of the plastic pipe is greatly improved, and the delamination phenomenon of the plastic pipe lining and the outer pipe caused by the linear expansion coefficient is greatly reduced.

[0004] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0005] A metal-plastic composite pipe comprises a plastic pipe, an intermediate layer and a metal pipe which are connected in sequence from the inside to the outside. The plastic pipe and the metal pipe are bonded together through the intermediate layer. The intermediate layer comprises a metal mesh and hot melt adhesive. The metal mesh is a mesh structure formed by connecting a plurality of metal wires. The hot melt adhesive is filled in the grid of the metal mesh.

[0006] As a further improvement of the above technical solution:

[0007] Preferably, the metal wire is a steel wire.

[0008] Preferably, after the metal mesh is unfolded, all the metal wires are located in the same plane.

[0009] Preferably, the metal mesh comprises at least two layers of metal wires, and after the metal mesh is unfolded, each layer of metal wires is in a different plane.

[0010] More preferably, the metal wires include a plurality of annular metal wires and a plurality of longitudinal metal wires, the plurality of annular metal wires are arranged at intervals, the plurality of longitudinal metal wires are also arranged at intervals, and the annular metal wires and the longitudinal metal wires are arranged crosswise.

[0011] More preferably, the annular wires and the longitudinal wires are connected together.

[0012] More preferably, the annular metal wires are arranged along the circumferential direction of the plastic tube and the metal tube, and the longitudinal metal wires are arranged along the axial direction of the plastic tube and the metal tube.

[0013] More preferably, when the metal wires of the metal mesh are provided with at least two layers, a plurality of metal wires in each layer are arranged in parallel and spaced apart, and the metal wires of two adjacent layers are perpendicular to each other.

[0014] More preferably, the metal mesh and the inner wall of the metal tube are welded together.

[0015] The beneficial effects of the utility model are as follows: the metal mesh is in a mesh structure, hot melt adhesive is filled in the grid of the metal mesh, and part of the metal wire is even immersed in the hot melt adhesive, so that the contact area between the metal mesh and the hot melt adhesive is larger, thereby making the bonding force between the metal mesh and the hot melt adhesive larger, and the hot melt adhesive simultaneously bonds the outer wall of the plastic pipe and the inner wall of the metal pipe. Compared with the traditional composite pipe without metal mesh, the adhesion of the plastic pipe is greatly improved, the metal mesh and the inner wall of the metal pipe are welded together, which further improves the connection strength between the metal mesh and the metal pipe, and greatly reduces the delamination phenomenon between the plastic pipe lining and the outer pipe due to the linear expansion coefficient, thereby increasing the pipe diameter range of the composite pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the first embodiment of the utility model.

[0017] Figure 2 yes Figure 1 An enlarged schematic diagram of point A.

[0018] Figure 3 It is a schematic diagram of the unfolded structure of the metal mesh of the first embodiment of the utility model.

[0019] Figure 4 It is a schematic diagram of the cross-sectional structure of the metal mesh in the first embodiment of the present utility model.

[0020] Figure 5 It is a structural schematic diagram of the second embodiment of the present utility model.

[0021] Figure 6 yes Figure 5 An enlarged schematic diagram of point B.

[0022] Figure 7 It is a schematic diagram of the unfolded structure of the metal mesh of the second embodiment of the utility model.

[0023] Figure 8 It is a schematic diagram of the cross-sectional structure of the metal mesh of the second embodiment of the present utility model. DETAILED DESCRIPTION

[0024] The specific implementation of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the present invention, and is not used to limit the present invention.

[0025] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0026] Embodiment 1

[0027] A metal-plastic composite pipe, such as Figures 1 to 4 As shown, the plastic tube 1, the middle layer 2 and the metal tube 3 are connected in sequence from the inside to the outside to form a three-layer sleeved tubular structure, and the plastic tube 1 and the metal tube 3 are bonded together by the middle layer 2. The middle layer 2 includes a metal mesh 21 and a hot melt adhesive 22. The metal mesh 21 is a mesh structure formed by connecting a plurality of metal wires, and the hot melt adhesive 22 is filled in the mesh of the metal mesh 21. The metal mesh 21 and the inner wall of the metal tube 3 are connected together by spot welding. The plastic tube 1 and the metal tube 3 are bonded together by the hot melt adhesive 22.

[0028] In this embodiment, the metal wire is a steel wire.

[0029] In this embodiment, the metal wires include a plurality of circumferential metal wires 211 and a plurality of longitudinal metal wires 212. The plurality of circumferential metal wires 211 are arranged at intervals, and the plurality of longitudinal metal wires 212 are also arranged at intervals. The circumferential metal wires 211 are arranged along the circumference of the plastic tube 1 and the metal tube 3, and the longitudinal metal wires 212 are arranged along the axial direction of the plastic tube 1 and the metal tube 3.

[0030] In this embodiment, the annular metal wires 211 and the longitudinal metal wires 212 cross and are connected at the intersection, which is equivalent to that after the metal mesh 21 is unfolded, the annular metal wires 211 and the longitudinal metal wires 212 are located in the same plane.

[0031] Embodiment 2

[0032] like Figures 5 to 8 As shown, different from the first embodiment, the metal mesh 21 in this embodiment includes at least two layers of metal wires, and the metal wires in each layer are connected in sequence. After the metal mesh 21 is unfolded, the metal wires in each layer are in different planes. Preferably, after the metal mesh 21 is unfolded, the planes where the metal wires in each layer are located are parallel to each other, and each metal wire in one layer crosses the metal wires in the adjacent layer. Furthermore, the multiple metal wires in each layer are arranged in parallel and spaced apart, and the metal wires in two adjacent layers are perpendicular to each other.

[0033] In this embodiment, two layers of metal wires are provided, one layer of metal wires is annular metal wires 211, and the other layer of metal wires is longitudinal metal wires 212. The annular metal wires 211 are arranged along the circumference of the plastic tube 1 and the metal tube 3, and the longitudinal metal wires 212 are arranged along the axial direction of the plastic tube 1 and the metal tube 3.

[0034] Compared with the first embodiment, the contact area between the metal mesh 21 and the hot melt adhesive 22 in this embodiment is larger, and the corresponding bonding force between the metal mesh 21 and the hot melt adhesive 22 is larger.

[0035] In addition, the number of layers of metal wire should not be too many, otherwise the thickness of the composite tube will be increased, and the diameter of the plastic inner tube will be reduced under the premise of the same outer tube.

[0036] Finally, it is necessary to explain here that the above embodiments are only used to further illustrate the technical solution of the utility model in detail and cannot be understood as limiting the protection scope of the utility model. Some non-essential improvements and adjustments made by technicians in this field based on the above content of the utility model belong to the protection scope of the utility model.

Claims

1. A metal-plastic composite pipe, characterized in that: The invention comprises a plastic tube (1), an intermediate layer (2) and a metal tube (3) which are connected in sequence from the inside to the outside. The plastic tube (1) and the metal tube (3) are bonded together via the intermediate layer (2). The intermediate layer (2) comprises a metal mesh (21) and hot melt adhesive (22). The metal mesh (21) is a mesh structure formed by connecting a plurality of metal wires. The hot melt adhesive (22) is filled in the mesh of the metal mesh (21).

2. The composite pipe according to claim 1, characterized in that: The metal wire is a steel wire.

3. The composite pipe according to claim 1, characterized in that: After the metal mesh (21) is unfolded, all the metal wires are located in the same plane.

4. The composite pipe according to claim 1, characterized in that: The metal net (21) comprises at least two layers of metal wires. After the metal net (21) is unfolded, the metal wires of each layer are in different planes.

5. The composite pipe according to claim 3 or 4, characterized in that: The metal wires include a plurality of annular metal wires (211) and a plurality of longitudinal metal wires (212). The plurality of annular metal wires (211) are arranged at intervals, and the plurality of longitudinal metal wires (212) are also arranged at intervals. The annular metal wires (211) and the longitudinal metal wires (212) are arranged crosswise.

6. The composite pipe according to claim 5, characterized in that: The annular metal wire (211) and the longitudinal metal wire (212) are connected together.

7. The composite pipe according to claim 5, characterized in that: The annular metal wires (211) are arranged along the circumference of the plastic tube (1) and the metal tube (3), and the longitudinal metal wires (212) are arranged along the axial direction of the plastic tube (1) and the metal tube (3).

8. The composite pipe according to claim 5, characterized in that: When the metal wires of the metal net (21) are provided with at least two layers, a plurality of metal wires in each layer are arranged in parallel and at intervals, and the metal wires of two adjacent layers are perpendicular to each other.

9. The composite pipe according to claim 1, characterized in that: The metal mesh (21) and the inner wall of the metal tube (3) are welded together.

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