Glass fiber polypropylene composite pipe

Abstract

The utility model discloses a glass fiber polypropylene composite pipe which comprises a polypropylene inner layer and first elastic noise reduction belts spirally wound outside the polypropylene inner layer, a first gap is formed between every two adjacent circles of first elastic noise reduction belts, and a glass fiber polypropylene reinforcing layer is extruded on the outer side of the polypropylene inner layer. The glass fiber polypropylene reinforcing layer is bonded with the polypropylene inner layer through the first gaps, second elastic noise reduction belts are spirally arranged on the outer side of the glass fiber polypropylene reinforcing layer, a second gap is formed between every two adjacent second elastic noise reduction belts, and a polypropylene outer layer is extruded on the outer side of the glass fiber polypropylene reinforcing layer; and the polypropylene outer layer is bonded with the glass fiber polypropylene reinforcing layer through the second gap. The glass fiber polypropylene composite pipe provided by the utility model has the advantages that the weight is reduced, adjacent layers are not easy to separate, and the structural stability is improved.

Description

Technical Field

[0001] This utility model relates to the field of composite pipe technology, and in particular to a glass fiber polypropylene composite pipe. Background Technology

[0002] Glass fiber reinforced polypropylene is a type of polypropylene composite material that has higher strength than ordinary polypropylene. However, this material has poor noise reduction performance. Therefore, existing composite pipes, such as the patent with application number CN201320589856.8, include a polypropylene inner layer, a metal damping material intermediate layer, and a polypropylene outer layer arranged sequentially from the inside out. The metal damping material intermediate layer is used for noise reduction. However, this type of composite pipe uses metal materials, making it heavier. Furthermore, the expansion coefficients of the metal damping material and polypropylene materials differ significantly. In daily use, the metal damping material intermediate layer, the polypropylene inner layer, and the polypropylene outer layer are prone to detachment, affecting structural stability. Utility Model Content

[0003] To address the shortcomings of existing composite pipes, such as their heavy weight and the tendency for adjacent layers to detach, this invention proposes a glass fiber polypropylene composite pipe that reduces weight, prevents adjacent layers from detaching, and improves structural stability.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A fiberglass-reinforced polypropylene composite pipe includes a polypropylene inner layer and a first elastic noise-reducing strip spirally wound around the outside of the polypropylene inner layer. A first gap is formed between two adjacent turns of the first elastic noise-reducing strip. A fiberglass-reinforced polypropylene reinforcing layer is extruded on the outside of the polypropylene inner layer and bonded to the polypropylene inner layer through the first gap. A second elastic noise-reducing strip is spirally wound around the outside of the fiberglass-reinforced polypropylene reinforcing layer. A second gap is formed between two adjacent turns of the second elastic noise-reducing strip. A polypropylene outer layer is extruded on the outside of the fiberglass-reinforced polypropylene reinforcing layer and bonded to the fiberglass-reinforced polypropylene reinforcing layer through the second gap.

[0006] With the above settings, firstly, the first and second elastic noise reduction strips can deform and absorb vibration, thus reducing noise. Moreover, the first and second elastic noise reduction strips are lightweight, reducing the overall weight of the composite pipe. Secondly, the expansion coefficients of the fiberglass polypropylene reinforcing layer, the inner polypropylene layer, and the outer polypropylene layer are close, and the fiberglass polypropylene reinforcing layer is bonded between the inner and outer polypropylene layers, making it difficult for the layers to separate, thus improving the structural stability of the composite pipe.

[0007] Furthermore, the width of the first elastic noise reduction band along the axial direction of the inner polypropylene layer is W1, the width of the second gap along the axial direction of the inner polypropylene layer is W2, W1≥W2, and the radial projection of the first elastic noise reduction band on the outer surface of the glass fiber polypropylene reinforcing layer covers the second gap.

[0008] The above settings further enhance the noise reduction effect.

[0009] Furthermore, the first and second elastic noise-reducing bands are made of PU or foam material.

[0010] Furthermore, the ratio of the thickness of the polypropylene outer layer to the thickness of the second elastic noise reduction band is greater than or equal to 2.

[0011] The above configuration allows the polypropylene outer layer to cover the second elastic noise reduction strip, preventing the outer side of the second elastic noise reduction strip from being exposed outside the polypropylene outer layer.

[0012] Furthermore, the thickness of the inner polypropylene layer is less than the thickness of the outer polypropylene layer.

[0013] By implementing the above settings, the amount of polypropylene inner layer used can be reduced, thereby reducing the weight of the composite pipe.

[0014] Furthermore, the ratio of the thickness of the glass fiber polypropylene reinforcing layer to the thickness of the first elastic noise reduction strip is greater than or equal to 3.

[0015] The above setup ensures that the fiberglass polypropylene reinforcing layer covers the first elastic noise reduction band while maintaining the overall strength of the composite pipe. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the composite pipe used in an embodiment.

[0017] Figure 2 This is a cross-sectional view of the composite pipe used in this embodiment.

[0018] Figure 3 for Figure 2 Enlarged view of point A.

[0019] Figure 4 This is a schematic diagram of the composite pipe with a hidden glass fiber polypropylene reinforcement layer and a polypropylene outer layer, as shown in the embodiment. Detailed Implementation

[0020] The technical solution of this utility model will be further described in detail below through embodiments and in conjunction with the accompanying drawings.

[0021] like Figures 1 to 4As shown, a fiberglass-reinforced polypropylene composite pipe includes a polypropylene inner layer 3 and a first elastic noise-reducing band 4 spirally wound around the polypropylene inner layer 3. A first gap is formed between two adjacent turns of the first elastic noise-reducing band 4. A fiberglass-reinforced polypropylene reinforcing layer 5 is extruded on the outside of the polypropylene inner layer 3. The fiberglass-reinforced polypropylene reinforcing layer 5 is bonded to the polypropylene inner layer 3 through the first gap. A second elastic noise-reducing band 6 is spirally wound on the outside of the fiberglass-reinforced polypropylene reinforcing layer 5. A second gap is formed between two adjacent turns of the second elastic noise-reducing band 6. A polypropylene outer layer 7 is extruded on the outside of the fiberglass-reinforced polypropylene reinforcing layer 5. The polypropylene outer layer 7 is bonded to the fiberglass-reinforced polypropylene reinforcing layer 5 through the second gap.

[0022] Through the above settings, firstly, the first elastic noise reduction band 4 and the second elastic noise reduction band 6 can deform and absorb vibration, thus playing a noise reduction role. Moreover, the first elastic noise reduction band 4 and the second elastic noise reduction band 6 are lightweight, reducing the overall weight of the composite pipe. Secondly, the expansion coefficients of the glass fiber polypropylene reinforcing layer 5, the polypropylene inner layer 3, and the polypropylene outer layer 7 are close, and the glass fiber polypropylene reinforcing layer 5 is bonded between the polypropylene inner layer 3 and the polypropylene outer layer 7, making it difficult for the layers to separate and improving the structural stability of the composite pipe.

[0023] In the fabrication of the composite pipe, the inner polypropylene layer 3 is formed by extrusion, and the material is polypropylene. A first elastic noise-reducing band 4 is spirally wrapped around the outside of the inner polypropylene layer 3. A glass fiber polypropylene reinforcing layer 5 is extruded onto the outside of the inner polypropylene layer 3, and the material of the glass fiber polypropylene reinforcing layer 5 is glass fiber polypropylene. The glass fiber polypropylene reinforcing layer 5 covers the first elastic noise-reducing band 4 and, after cooling, is directly bonded to the outside of the inner polypropylene layer 3 through a first gap. Then, a second elastic noise-reducing band 6 is spirally wrapped around the outside of the glass fiber polypropylene reinforcing layer 5. The outer polypropylene layer 7 is extruded onto the outside of the glass fiber polypropylene reinforcing layer 5, and the material is polypropylene. The outer polypropylene layer 7 covers the second elastic noise-reducing band 6 and is directly bonded to the glass fiber polypropylene reinforcing layer 5 through a second gap. The relatively smooth polypropylene material makes the inner and outer walls of the composite pipe of this application smooth, while the high strength of the glass fiber polypropylene reinforcing layer 5 improves the overall strength of the composite pipe. The first elastic noise reduction strip 4 and the second elastic noise reduction strip 6 are made of porous elastic material. When water flows through the composite pipe and noise is generated, the first elastic noise reduction strip 4 and the second elastic noise reduction strip 6 can absorb some of the vibration and sound waves, thus playing a role in sound insulation and noise reduction.

[0024] As one implementation, the first elastic noise reduction band 4 and the second elastic noise reduction band 6 have the same spiral direction. The width of the first elastic noise reduction band 4 along the axial direction of the polypropylene inner layer 3 is W1, and the width of the second gap along the axial direction of the polypropylene inner layer 3 is W2, where W1 ≥ W2. The radial projection of the first elastic noise reduction band 4 on the outer surface of the glass fiber polypropylene reinforcing layer 5 covers the second gap.

[0025] The above settings further enhance the noise reduction effect.

[0026] When noise is generated inside the composite pipe due to water flow, the sound waves spread outward radially. The first elastic noise reduction band 4 and the second elastic noise reduction band 6 can effectively block the sound waves, ensuring that the first elastic noise reduction band 4 and the second elastic noise reduction band 6 function.

[0027] As one implementation method, the first elastic noise reduction band 4 and the second elastic noise reduction band 6 are made of PU material or foam material.

[0028] Both PU and foam materials have good elasticity and contain abundant pores, which have good vibration absorption and noise reduction effects. In addition, both PU and foam materials are made of materials with high melting points to prevent the first elastic noise reduction band 4 and the second elastic noise reduction band 6 from melting when the glass fiber polypropylene reinforcing layer 5 and the polypropylene outer layer 7 are extruded on the outside of the first elastic noise reduction band 4 and the outside of the second elastic noise reduction band 6.

[0029] As one implementation method, the ratio of the thickness of the polypropylene outer layer 7 to the thickness of the second elastic noise reduction band 6 is greater than or equal to 2.

[0030] With the above configuration, the polypropylene outer layer 7 can cover the second elastic noise reduction band 6, preventing the outer side of the second elastic noise reduction band 6 from being exposed outside the polypropylene outer layer 7.

[0031] As one implementation method, the thickness of the polypropylene inner layer 3 is less than the thickness of the polypropylene outer layer 7.

[0032] By implementing the above settings, the amount of polypropylene inner layer 3 can be reduced, thereby reducing the weight of the composite pipe.

[0033] The polypropylene inner layer 3 in this application serves to increase the smoothness of the inner wall of the composite pipe, reduce the friction between the water flow and the inner wall of the composite pipe, and thus reduce noise. Because the polypropylene inner layer 3 does not need to be very thick, in actual production, the thickness of the polypropylene inner layer 3 is less than or equal to five millimeters.

[0034] As one implementation method, the ratio of the thickness of the glass fiber polypropylene reinforcing layer 5 to the thickness of the first elastic noise reduction band 4 is greater than or equal to 3.

[0035] The above setup ensures that the fiberglass polypropylene reinforcing layer 5 can cover the first elastic noise reduction band 4, while also guaranteeing the overall strength of the composite pipe.

[0036] It should be understood that those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.

Claims

1. A fiberglass-polypropylene composite pipe, characterized in that, The device includes a polypropylene inner layer and a first elastic noise-reducing band spirally wound around the outer side of the polypropylene inner layer. A first gap is formed between two adjacent turns of the first elastic noise-reducing band. A glass fiber polypropylene reinforcing layer is extruded on the outer side of the polypropylene inner layer. The glass fiber polypropylene reinforcing layer is bonded to the polypropylene inner layer through the first gap. A second elastic noise-reducing band is spirally wound on the outer side of the glass fiber polypropylene reinforcing layer. A second gap is formed between two adjacent turns of the second elastic noise-reducing band. A polypropylene outer layer is extruded on the outer side of the glass fiber polypropylene reinforcing layer. The polypropylene outer layer is bonded to the glass fiber polypropylene reinforcing layer through the second gap.

2. The fiberglass-polypropylene composite pipe according to claim 1, characterized in that, The first elastic noise reduction band and the second elastic noise reduction band have the same spiral direction. The width of the first elastic noise reduction band along the axial direction of the inner polypropylene layer is W1, and the width of the second gap along the axial direction of the inner polypropylene layer is W2, where W1 ≥ W2. The radial projection of the first elastic noise reduction band on the outer surface of the glass fiber polypropylene reinforcing layer covers the second gap.

3. The fiberglass-polypropylene composite pipe according to claim 1, characterized in that, The first and second elastic noise-reducing bands are made of PU or foam.

4. The fiberglass-polypropylene composite pipe according to claim 1, characterized in that, The ratio of the thickness of the polypropylene outer layer to the thickness of the second elastic noise-reducing band is greater than or equal to 2.

5. The fiberglass-polypropylene composite pipe according to claim 1, characterized in that, The thickness of the inner polypropylene layer is less than the thickness of the outer polypropylene layer.

6. The fiberglass-polypropylene composite pipe according to claim 1, characterized in that, The ratio of the thickness of the glass fiber polypropylene reinforcing layer to the thickness of the first elastic noise reduction strip is greater than or equal to 3.

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