A high strength pipe fitting

Abstract

The utility model discloses a high -strength pipe fitting, including pipe fitting main part, and the pipe fitting main part is from inside to outside in proper order inside lining, reinforcing layer and outer protective layer, the inside lining is ultrahigh molecular weight polyethylene material, and reinforcing layer is polyvinyl chloride material, and is equipped with the net -like structure of being woven with long fiber in reinforcing layer, the outer protective layer is polyurethane or modified polypropylene material, and the lateral outside of outer protective layer is all provided with the reinforcing rib along the axial direction and the circumference direction, the utility model discloses the pipe fitting is divided into three -layer structure, and sets up the net -like structure of being woven with glass fiber in the inside reinforcing layer, and glass fiber can effectively disperse stress, improve the strength of pipe fitting, and it is not easy to deform because of stress, ensure that pipe fitting has enough strength, corrosion resistance and durability.

Description

Technical Field

[0001] This utility model relates to the field of plastic pipe technology, and in particular to a high-strength pipe fitting. Background Technology

[0002] Plastic pipe fittings are widely used in many fields such as industrial fluid transportation and building water supply and drainage due to their advantages such as light weight, low cost, and corrosion resistance. However, the strength and pressure resistance of plastic pipe fittings are far lower than those of metal pipe fittings. In building water supply and drainage systems, these fittings need to withstand certain water pressure and the influence of the external environment. Over long-term use, ordinary plastic pipe fittings may experience deformation and leakage due to their limited strength, affecting the normal operation of the water supply and drainage system and increasing maintenance costs. Utility Model Content

[0003] To address the aforementioned issues, this invention provides a high-strength pipe fitting that can withstand certain water pressure and external pressure, meeting long-term drainage needs and offering a long service life.

[0004] Therefore, the technical solution of this utility model is: a high-strength pipe fitting, comprising a pipe fitting body, wherein the pipe fitting body comprises an inner lining layer, a reinforcing layer and an outer protective layer from the inside out; the inner lining layer is made of ultra-high molecular weight polyethylene, the reinforcing layer is made of polyvinyl chloride, and the reinforcing layer has a mesh structure woven from long fibers; the outer protective layer is made of polyurethane or modified polypropylene, and the outer protective layer has reinforcing ribs arranged along the axial and circumferential directions on its outer side.

[0005] Based on the above scheme and as a preferred embodiment, the long fibers of the reinforcing layer are glass fibers, and the angle between the long fibers and the axial direction of the pipe body is ±45 degrees to ±75 degrees. This angle range allows the long fibers to effectively disperse stress in the reinforcing layer, fully exerting their reinforcing effect when subjected to internal pressure, external pressure, and axial tension, thus significantly improving the overall mechanical properties of the pipe.

[0006] Based on the above scheme and as a preferred embodiment, the outer protective layer is provided with multiple axial reinforcing ribs and multiple radial reinforcing ribs on its outer side, with the cross-sections of the axial and radial reinforcing ribs being trapezoidal. These reinforcing ribs help to disperse stress, prevent pipe breakage caused by stress concentration, and further enhance the strength and compressive strength of the pipe, making it more adaptable to complex stress environments and meeting long-term drainage requirements.

[0007] Based on the above scheme and as a preferred embodiment of the above scheme: the thickness of the inner lining layer is 0.8~1.5mm, the thickness of the reinforcing layer is 1~2mm, and the thickness of the outer protective layer is 1~3mm.

[0008] Based on the above scheme and as a preferred embodiment, the inner wall of the lining layer is provided with several uniformly distributed flow guide grooves along the axial direction. The depth of the flow guide grooves is 0.1~0.3mm and the width is 0.2~0.5mm. These flow guide grooves help reduce the resistance of the medium flowing in the pipe, extend the service life of the lining layer, and ensure long-term stable conveying performance.

[0009] Based on the above scheme and as a preferred embodiment: In the reinforcing layer, a plurality of reinforcing rings are spaced apart along the radial direction of the pipe body. These reinforcing rings are made of high-strength carbon fiber reinforced plastic with a thickness of 0.3~0.5mm. The reinforcing rings cooperate with the long-fiber mesh structure. The reinforcing rings possess high strength and high modulus characteristics, enabling them to withstand and disperse radial pressure, preventing radial deformation of the pipe. Together with the long-fiber mesh structure, they enhance the mechanical properties of the pipe in all directions, allowing the pipe to withstand higher water pressure and external pressure, effectively solving the problem of low strength and pressure resistance of ordinary plastic pipes.

[0010] Based on the above solution and as a preferred embodiment, the outer protective layer and the outer side of the reinforcing ribs are coated with an anti-ultraviolet coating. This anti-ultraviolet coating prevents the pipe fittings from aging due to ultraviolet radiation.

[0011] Compared with the prior art, the beneficial effects of this utility model are:

[0012] The pipe fitting is divided into three layers. The inner reinforcing layer is made of a mesh structure woven from glass fiber. The glass fiber can effectively disperse stress, improve the strength of the pipe fitting, and prevent it from deforming under stress. This ensures that the pipe fitting has sufficient strength, corrosion resistance and durability, without increasing weight and cost due to excessive material thickness, thus improving the product's cost performance and market competitiveness.

[0013] Adding axial and radial reinforcing ribs to the outer side of the outer protective layer further enhances the strength and compressive strength of the pipe fitting. Increasing reinforcing rings within the reinforcing layer further enhances the radial compressive strength of the pipe fitting, prevents radial deformation, and improves its compressive strength. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of Example 1;

[0015] Figure 2 This is a schematic diagram of the structure of Example 2;

[0016] Figure 3 This is a schematic diagram of the structure of Example 3.

[0017] The components are labeled as follows: inner lining layer 1, flow channel 11, reinforcement layer 2, outer protective layer 3, axial reinforcing rib 31, radial reinforcing rib 32, mesh structure 4, and reinforcing ring 5. Detailed Implementation

[0018] In the description of this utility model, it should be noted that the directional terms such as "center", "horizontal (X)", "longitudinal (Y)", "vertical (Z)", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", and "counterclockwise" indicate the orientation and positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. They should not be construed as limiting the specific protection scope of this utility model.

[0019] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features. Thus, the use of "first" and "second" to define a feature may explicitly or implicitly include one or more of that feature. In the description of this utility model, "several" or "a number" means two or more, unless otherwise explicitly specified.

[0020] Example 1

[0021] The high-strength pipe fitting described in this embodiment includes a pipe body, which, from the inside out, consists of an inner lining layer 1, a reinforcing layer 2, and an outer protective layer 3. The inner lining layer 1 has a thickness of 0.8~1.5mm and can be made of ultra-high molecular weight polyethylene, which has good corrosion resistance and lubricity, allowing for smoother flow of the internal medium.

[0022] The reinforcing layer 2 is 1-2 mm thick, made of polyvinyl chloride, and contains a mesh structure 4 woven from long glass fibers. The angle between the glass fibers and the axial direction of the pipe body is ±45 degrees to ±75 degrees. This angle range allows the glass fibers to effectively disperse stress within the reinforcing layer, fully exerting their reinforcing effect when subjected to internal pressure, external pressure, and axial tension, significantly improving the overall mechanical properties of the pipe. When the pipe is subjected to torsional force, the long fiber mesh structure can convert the torsional force into part of the radial force, which is resisted by the reinforcing ring, thereby improving the overall torsional resistance of the pipe.

[0023] The outer protective layer 3 has a thickness of 1-3 mm and is made of polyurethane or modified polypropylene. Multiple axial reinforcing ribs 31 and multiple radial reinforcing ribs 32 are provided on the outer side of the outer protective layer 3. The cross-sections of the axial reinforcing ribs 31 and radial reinforcing ribs 32 are trapezoidal. These reinforcing ribs help disperse stress, prevent pipe breakage caused by stress concentration, and further enhance the strength and compressive strength of the pipe, making it more adaptable to complex stress environments and meeting long-term drainage requirements. Depending on the application scenario, the outer protective layer 3 and the outer side of the reinforcing ribs can be selectively coated with an anti-UV coating (not shown in the figure). The anti-UV coating prevents the pipe from aging due to UV radiation.

[0024] The processing technology is as follows:

[0025] Prepare polyvinyl chloride (PVC) resin as the matrix material and high-strength glass fiber for weaving the mesh structure;

[0026] Advanced fiber weaving technology is employed to weave high-strength glass fibers into a mesh structure. During the weaving process, the angle between the long fibers and the axial direction of the main body of the pipe is precisely controlled within ±45 degrees to ±75 degrees to ensure that the long fibers can effectively play a reinforcing role in the reinforcing layer. Automated weaving equipment can be used, and the fiber direction and weaving density can be controlled by programming to ensure the uniformity and stability of the mesh structure.

[0027] The woven long fiber mesh structure is mixed with a PVC matrix material containing nano-sized silica particles. Mechanical stirring or co-extrusion methods can be used to ensure that the long fibers are uniformly dispersed in the matrix material, forming a composite preform with preliminary reinforcement.

[0028] The mold containing the composite preform is placed into molding equipment such as an extruder or injection molding machine for secondary molding. During this process, heating and pressure further melt and flow the PVC matrix material, fully filling the gaps between the long fiber network structure, and compacting the entire reinforcing layer material within the mold, resulting in better bonding with the inner lining and outer protective layer of the pipe fitting. Precise control of parameters such as temperature, pressure, and extrusion speed is crucial during molding to ensure the dimensional accuracy and performance stability of the reinforcing layer. For example, in extrusion molding, the temperature is controlled within the melting temperature range of PVC resin (160~190℃), the pressure is adjusted according to the mold structure and pipe size, and the extrusion speed is kept uniform and stable to ensure uniform thickness and consistent quality of the reinforcing layer.

[0029] Example 2

[0030] In this embodiment, based on the reinforcing layer 2 of Embodiment 1, a plurality of reinforcing rings 5 ​​are spaced apart along the radial direction of the pipe body. The reinforcing rings 5 ​​are made of high-strength carbon fiber reinforced plastic with a thickness of 0.3~0.5mm. The reinforcing rings 5 ​​cooperate with the long fiber mesh structure 4. The reinforcing rings have high strength and high modulus characteristics, can withstand and disperse radial pressure, prevent radial deformation of the pipe, and work synergistically with the long fiber mesh structure to enhance the mechanical properties of the pipe in all directions, enabling the pipe to withstand higher water pressure and external pressure, effectively solving the problem of low strength and pressure resistance of ordinary plastic pipes.

[0031] During processing, high-strength carbon fiber reinforced plastic prepreg is cut into suitable sheets according to the designed reinforcing ring size and shape. Then, the prepreg sheets are laid layer by layer on a specific mold according to a certain layup sequence and angle. During the layup process, attention should be paid to the orientation and overlapping method of the prepreg to ensure the consistency of the reinforcing ring's performance in all directions. Generally, a multi-layer cross-layup method is used to distribute the carbon fibers in different directions, thereby improving the overall mechanical properties of the reinforcing ring.

[0032] The mold with the prepreg laid on it is placed in a hot press and cured under specific temperature, pressure, and time conditions. During the hot pressing process, the resin matrix in the prepreg undergoes a cross-linking reaction, firmly bonding the carbon fibers together to form a reinforcing ring with high strength and stiffness. Specific hot pressing parameters (such as temperature, pressure, and time) need to be optimized and determined based on the type of prepreg and the mold structure to ensure that the quality and performance of the reinforcing ring meet the design requirements.

[0033] Next, place the PVC composite material blank containing the long fiber mesh structure in a suitable position, and then install the formed reinforcing rings radially in the composite material blank according to the design interval, ensuring that the reinforcing rings and the long fiber mesh structure are tightly fitted without gaps or misalignment, and finally perform secondary molding.

[0034] Example 3

[0035] Based on Example 1, this embodiment adds several evenly distributed flow guide grooves 11 along the axial direction on the inner wall of the inner lining layer 1. The depth of the flow guide grooves 11 is 0.1~0.3mm and the width is 0.2~0.5mm. These flow guide grooves help reduce the resistance of the medium flowing in the pipe, extend the service life of the inner lining layer 1, and ensure long-term stable conveying performance.

[0036] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. A high strength pipe fitting comprising a pipe fitting body, characterized by: The main body of the pipe fitting consists of an inner lining layer, a reinforcing layer, and an outer protective layer from the inside out. The inner lining layer is made of ultra-high molecular weight polyethylene, the reinforcing layer is made of polyvinyl chloride, and the reinforcing layer has a mesh structure woven from long fibers. The outer protective layer is made of polyurethane or modified polypropylene, and the outer protective layer has reinforcing ribs along both the axial and circumferential directions.

2. A high-strength pipe fitting as described in claim 1, characterized in that: The long fibers of the reinforcing layer are glass fibers, and the angle between the long fibers and the axial direction of the pipe body is ±45 degrees to ±75 degrees.

3. A high-strength pipe fitting as described in claim 1, characterized in that: The outer protective layer is provided with multiple axial reinforcing ribs and multiple radial reinforcing ribs on the outside, and the cross-section of the axial reinforcing ribs and radial reinforcing ribs is trapezoidal.

4. A high-strength pipe fitting as described in claim 1, characterized in that: The inner lining layer has a thickness of 0.8~1.5mm, the reinforcing layer has a thickness of 1~2mm, and the outer protective layer has a thickness of 1~3mm.

5. A high-strength pipe fitting as described in claim 1, characterized in that: The inner wall of the lining layer is provided with several uniformly distributed guide grooves along the axial direction. The depth of the guide grooves is 0.1~0.3mm and the width is 0.2~0.5mm.

6. A high-strength pipe fitting as described in claim 1, characterized in that: In the reinforcing layer, a number of reinforcing rings are arranged at intervals along the radial direction of the main body of the pipe. The reinforcing rings are made of high-strength carbon fiber reinforced plastic with a thickness of 0.3~0.5mm. The reinforcing rings cooperate with the long fiber mesh structure.

7. A high-strength pipe fitting as described in claim 1, characterized in that: The outer protective layer and the outer side of the reinforcing ribs are coated with an anti-ultraviolet coating.

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