A continuous glass fiber reinforced thermoplastic pipe

Abstract

The utility model relates to a continuous glass fiber reinforced thermoplastic pipe, comprising an inner tube, an intermediate reinforcement layer and an outer tube which are sequentially distributed from the inside to the outside, wherein the intermediate reinforcement layer comprises at least one glass fiber tape layer, wherein the glass fiber tape layer is composed of at least two glass fiber reinforcement tapes, wherein each glass fiber reinforcement tape of the same glass fiber tape layer is distributed on the circumferential outer wall of the inner tube along the circumferential direction of the tube, and each glass fiber reinforcement tape extends along the axial direction of the tube. The pipe in the utility model adopts the design of the glass fiber reinforcement tape extending along the axial direction of the tube for the design of the intermediate reinforcement layer, and is matched with the distribution form distributed on the circumferential outer wall of the inner tube along the circumferential direction of the tube, so that during processing, the inner tube, the intermediate reinforcement layer and the outer tube can be formed at one time by pultrusion, which greatly reduces the forming process and relatively reduces the energy consumption; in addition, under this forming method, the main load is borne by the glass fiber reinforcement tape, and the inner tube and the outer tube can be directly made thin, thereby reducing the wall thickness of the entire tube.

Description

Technical Field

[0001] The utility model relates to the field of glass fiber composite pipes, in particular to a continuous glass fiber reinforced thermoplastic pipe. Background Art

[0002] Pipelines are used to transport liquid substances such as water or oil. In order to prevent them from being exposed to the outside world for a long time and causing rapid aging, they are generally buried underground or wrapped in layers. In this case, once a pipeline ruptures, the protective layer needs to be removed or dug out from the ground for replacement, which leads to excessive maintenance costs. Usually, the reason for pipeline rupture is often because the pipeline strength is not strong enough, and the pipeline ruptures due to squeezing on this basis, and during the installation process and transportation, the pipeline is pulled or the torsional force when the pipeline is connected is too large, causing the pipeline to rupture. Therefore, a high-strength pipeline is required.

[0003] Most of the reinforced pipes currently available on the market adopt a structural design of an inner tube, a reinforcement layer and an outer tube, and the most common reinforcement layer is a glass fiber reinforcement layer. There are two main ways to form a glass fiber reinforced layer: the first way is to directly extrude the glass fiber reinforced raw material, for example, a glass fiber reinforced pipe mentioned in patent CN109751461A, including an inner pipe, the outer surface of the PPR inner pipe is fixedly connected to a glass fiber layer, the outer surface of the glass fiber layer is fixedly connected to an outer pipe, and the glass fiber layer in the patent is; the second way is to first make the glass fiber reinforced raw material into a glass fiber tape, and then wind it around the outer wall of the inner pipe by spiral winding, for example, a continuous glass fiber tape-wound reinforced polyethylene composite pipe mentioned in patent CN114857372A, including an inner pipe, the outer wall of the inner pipe is wound with a reinforcement layer, and the outer wall of the reinforcement layer is provided with a protective layer; the reinforcement layer includes a first glass fiber tape, the inner wall of the first glass fiber tape is connected to the outer wall of the inner pipe, the inner wall and outer wall of the first glass fiber tape are connected to a second glass fiber tape, and the outer wall of the second glass fiber tape is connected to the inner wall of the protective layer; a plurality of explosion-proof rings are provided on the outer wall of the protective layer.

[0004] In the above two methods, during molding, it is necessary to first mold the inner tube, then mold the glass fiber reinforcement layer on the outer wall of the inner tube, and finally mold the outer tube on the outer wall of the glass fiber reinforcement layer. Three moldings are required, which is not conducive to processing. In addition, since a step-by-step molding method is adopted, in order to improve the load capacity of the pipe, there are certain requirements for the wall thickness of each molded pipe, especially the wall thickness of the inner tube. Once it is too thin, it is easy to cause cracking and other undesirable phenomena during subsequent molding, which results in a thicker wall thickness of the final molded pipe. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide a continuous glass fiber reinforced thermoplastic pipe which is easy to process and thin in thickness.

[0006] In order to solve the above technical problems, the technical solution of the utility model is: a continuous glass fiber reinforced thermoplastic pipe, including an inner layer pipe, an intermediate reinforcement layer and an outer layer pipe distributed in sequence from the inside to the outside, and its innovation lies in: the intermediate reinforcement layer includes at least one glass fiber tape layer, and the glass fiber tape layer is composed of at least two glass fiber reinforced tapes. The glass fiber reinforced tapes of the same glass fiber tape layer are distributed on the circumferential outer wall of the inner layer pipe along the circumferential direction of the pipe, and each of the glass fiber reinforced tapes extends along the axial direction of the pipe.

[0007] Furthermore, the glass fiber tape layer has one layer, and the glass fiber tape layer is composed of at least two glass fiber reinforced tapes, and adjacent sides of two adjacent glass fiber reinforced tapes are overlapped with each other.

[0008] Furthermore, the glass fiber tape layer has at least two layers, each glass fiber tape layer is composed of at least two glass fiber reinforced tapes, a gap is left between each glass fiber reinforced tape in the same glass fiber tape layer, and each glass fiber reinforced tape in the outer glass fiber tape layer and each glass fiber reinforced tape in the inner glass fiber tape layer are staggered, and the glass fiber reinforced tape in the outer layer covers the gap between adjacent glass fiber reinforced tapes in the inner glass fiber tape layer.

[0009] Furthermore, the glass fiber tape layer has at least two layers, each glass fiber tape layer is composed of at least two glass fiber reinforced tapes, and in each glass fiber tape layer, the center points of each glass fiber reinforced tape at the same position are on a ray with the same end point on the axis of the pipe, and the sizes of each glass fiber reinforced tape on the same ray increase or decrease in sequence, and the size changes of each glass fiber reinforced tape on two adjacent rays are opposite.

[0010] Furthermore, the inner layer tube and the outer layer tube are both HDPE tubes.

[0011] The advantages of the utility model are as follows: the pipe in the utility model adopts a glass fiber reinforced tape extending along the axial direction of the pipe for the design of the intermediate reinforcement layer, and is matched with a distribution form distributed on the circumferential outer wall of the inner pipe along the circumferential direction of the pipe, so that during processing, the inner pipe, the intermediate reinforcement layer and the outer pipe can be formed together at one time by pultrusion, which greatly reduces the molding process and relatively reduces energy consumption; in addition, under this molding method, the main load is borne by the glass fiber reinforced tape, and the inner pipe and the outer pipe can be directly made thin, thereby reducing the wall thickness of the entire pipe.

[0012] For the design of the middle reinforcement layer:

[0013] When there is only one layer of glass fiber tape, the gaps between the glass fiber reinforced tapes are eliminated by overlapping adjacent glass fiber reinforced tapes, thereby improving the structural strength of the entire middle reinforcement layer and avoiding the structural reinforcement effect of the middle reinforcement layer being affected by the existence of gaps between adjacent glass fiber reinforced tapes.

[0014] When there are multiple layers of glass fiber tapes, the gaps between the glass fiber reinforced tapes can be eliminated by staggering the inner and outer layers of the glass fiber reinforced tapes, or by changing the size of the glass fiber reinforced tapes, thereby improving the structural strength of the entire middle reinforcement layer. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the continuous glass fiber reinforced thermoplastic pipe of the utility model.

[0016] Figure 2 This is a schematic diagram of the first structure of the middle reinforcement layer in the utility model.

[0017] Figure 3 This is a schematic diagram of the second structure of the middle reinforcement layer in the utility model.

[0018] Figure 4 This is a schematic diagram of the third structure of the middle reinforcement layer in the utility model. DETAILED DESCRIPTION

[0019] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined purpose of the utility model, the specific implementation method, structure, characteristics and effects of the present invention are described in detail below in combination with the accompanying drawings and preferred embodiments.

[0020] like Figure 1-Figure 4 A continuous glass fiber reinforced thermoplastic pipe is shown, comprising an inner layer pipe 1, an intermediate reinforcement layer 2 and an outer layer pipe 3 which are sequentially distributed from the inside to the outside, the inner layer pipe 1 and the outer layer pipe 3 are both HDPE pipes, the intermediate reinforcement layer 2 comprises at least one glass fiber tape layer, the glass fiber tape layer is composed of at least two glass fiber reinforced tapes 21, each glass fiber reinforced tape 21 of the same glass fiber tape layer is distributed on the circumferential outer wall of the inner layer pipe 1 along the circumferential direction of the pipe, and each glass fiber reinforced tape 21 extends along the axial direction of the pipe, and the cross section of a single glass fiber reinforced tape 21 is arc-shaped.

[0021] Combine the following Figure 2-Figure 4 The results of the intermediate enhancement layer 2 are described in detail:

[0022] like Figure 2In the first structural form of the intermediate reinforcement layer 2 shown, there is one glass fiber tape layer, which is composed of four glass fiber reinforcement tapes 21, and the adjacent sides of two adjacent glass fiber reinforcement tapes 21 are overlapped with each other. The gaps between the glass fiber reinforcement tapes 21 are eliminated by overlapping the adjacent glass fiber reinforcement tapes 21, thereby improving the structural strength of the entire intermediate reinforcement layer 2. Since the entire intermediate reinforcement layer 2 is composed of multiple axially extending glass fiber reinforcement tapes 21, it is inevitable that there will be gaps or cracks between adjacent glass fiber reinforcement tapes 21. By overlapping the glass fiber reinforcement tapes 21, the structural reinforcement effect of the intermediate reinforcement layer 2 is avoided to be affected by the existence of gaps between adjacent glass fiber reinforcement tapes 21.

[0023] like Figure 3 In the second structural form of the intermediate reinforcement layer 2 shown, there are seven glass fiber tape layers, which are coaxially distributed on the circumferential outer wall of the inner layer tube 1 from the inside to the outside, and each glass fiber tape layer is composed of four glass fiber reinforcement tapes 21. There is a gap 22 between each glass fiber reinforcement tape 21 in the same glass fiber tape layer, and the glass fiber reinforcement tapes 21 in the outer glass fiber tape layer and the glass fiber reinforcement tapes 21 in the inner glass fiber tape layer are staggered, and the glass fiber reinforcement tapes 21 in the outer layer cover the gaps 22 between adjacent glass fiber reinforcement tapes 21 in the inner glass fiber tape layer. By staggering the glass fiber reinforced tapes 21 of the inner glass fiber tape layer and the glass fiber reinforced tapes 21 of the outer glass fiber tape layer, the purpose of eliminating the gaps between the glass fiber reinforced tapes 21 is achieved, thereby improving the structural strength of the entire middle reinforcement layer. The existence of the gap 22 is based on the inevitable existence of gaps between adjacent glass fiber reinforced tapes 21 under the structural form of the utility model. Therefore, when performing structural design, the gap 22 can be directly reserved, which makes it more convenient to perform pipe pultrusion processing and molding, without having to specially consider whether the contact between two adjacent glass fiber reinforced tapes 21 is tight or whether there is overlap.

[0024] like Figure 4 The third structural form of the intermediate reinforcement layer 2 shown in the figure has seven glass fiber tape layers, each of which is composed of four glass fiber reinforcement tapes 21. In each glass fiber tape layer, the center points of each glass fiber reinforcement tape 21 at the same position are on the same ray, and the end points of the ray are on the axis of the pipe. The sizes of each glass fiber reinforcement tape 21 on the same ray increase or decrease in sequence, thereby forming a structure similar to a step, and the size changes of each glass fiber reinforcement tape 21 on two adjacent rays are opposite. Through this opposite size change, the glass fiber reinforcement tapes 21 can be well connected, and the size change between the glass fiber reinforcement tapes 21 can achieve the purpose of eliminating the gap between adjacent glass fiber reinforcement tapes 21, thereby improving the structural strength of the entire intermediate reinforcement layer 2.

[0025] The pipe in the utility model is designed for the middle reinforcement layer 2 between the inner tube 1 and the outer tube 3, and adopts the design of the glass fiber reinforcement belt 21 extending along the axial direction of the pipe, and cooperates with the distribution form distributed on the circumferential outer wall of the inner tube 1 along the circumferential direction of the pipe to form the entire middle reinforcement layer 2. Based on this structural form, during processing, the inner tube 1, the middle reinforcement layer 2 and the outer tube 3 can be formed together at one time by pultrusion, which greatly reduces the molding process, and compared with the multiple molding method, the energy consumption consumed in the one-time molding is also greatly reduced, which can save one-half to two-thirds of the energy consumption.

[0026] In addition, the inner tube 1, the middle reinforcement layer 2 and the outer tube 3 are formed together by pultrusion at one time. The main load is borne by the glass fiber reinforced tape 21 constituting the middle reinforcement layer 2. The inner tube 1 and the outer tube 3 can be directly made thinner, thereby reducing the wall thickness of the entire tube. The tube wall thickness can be reduced to two-thirds to one-half.

[0027] The above description is only a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A continuous glass fiber reinforced thermoplastic pipe, comprising an inner layer pipe, an intermediate reinforcement layer and an outer layer pipe which are sequentially arranged from the inside to the outside, characterized in that: The intermediate reinforcement layer includes at least one glass fiber tape layer, and the glass fiber tape layer is composed of at least two glass fiber reinforcement tapes. The glass fiber reinforcement tapes of the same glass fiber tape layer are distributed on the circumferential outer wall of the inner layer tube along the circumferential direction of the tube, and each of the glass fiber reinforcement tapes extends along the axial direction of the tube.

2. The continuous glass fiber reinforced thermoplastic pipe according to claim 1, characterized in that: The glass fiber tape layer has one layer, and the glass fiber tape layer is composed of at least two glass fiber reinforced tapes, and the adjacent sides of two adjacent glass fiber reinforced tapes are overlapped with each other.

3. The continuous glass fiber reinforced thermoplastic pipe according to claim 1, characterized in that: The glass fiber tape layer has at least two layers, each glass fiber tape layer is composed of at least two glass fiber reinforced tapes, a gap is left between each glass fiber reinforced tape in the same glass fiber tape layer, and each glass fiber reinforced tape in the outer glass fiber tape layer and each glass fiber reinforced tape in the inner glass fiber tape layer are staggered, and the glass fiber reinforced tape in the outer layer covers the gap between adjacent glass fiber reinforced tapes in the inner glass fiber tape layer.

4. The continuous glass fiber reinforced thermoplastic pipe according to claim 1, characterized in that: The glass fiber tape layer has at least two layers, and each glass fiber tape layer is composed of at least two glass fiber reinforced tapes. In each glass fiber tape layer, the center points of each glass fiber reinforced tape at the same position are on a ray with the same end point on the axis of the pipe, and the sizes of each glass fiber reinforced tape on the same ray increase or decrease in sequence, and the size changes of each glass fiber reinforced tape on two adjacent rays are opposite.

5. The continuous glass fiber reinforced thermoplastic pipe according to claim 1, characterized in that: The inner layer tube and the outer layer tube are both HDPE tubes.

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