A multi-layer co-extruded polypropylene composite pipe

Abstract

This utility model discloses a multi-layer co-extruded polypropylene composite pipe, comprising an antibacterial layer, a pressure-resistant layer, and a UV protective layer extruded sequentially from the inside out. Multiple longitudinally extending bottom ribs are integrally formed on the lower side of the UV protective layer, forming a reference surface at the lower ends of all the bottom ribs. The reference surface is located on the lower side of the UV protective layer and does not intersect. The bottom ribs have a V-shaped cross-section, forming a cavity between the bottom ribs and the UV protective layer. An insulation strip is installed within the cavity. This utility model proposes a pipe material that prevents ultraviolet rays from entering the pipe.

Description

Technical Field

[0001] This utility model relates to the field of composite pipe technology, and in particular to a multilayer co-extruded polypropylene composite pipe. Background Technology

[0002] Multi-layer co-extruded polypropylene (PP-R) composite pipes, hereinafter referred to as pipes, are widely used for hot and cold water supply in municipal and office buildings. Existing pipes consist of an antibacterial layer, a pressure-resistant layer, and a UV-protective layer, arranged sequentially from the inside out. The antibacterial layer prevents scaling on the inner wall of the pipe, the pressure-resistant layer increases the pipe's compressive strength, and the outer UV-protective layer contains UV stabilizers, making the pipe suitable for outdoor use and preventing external ultraviolet rays from entering the pipe, further enhancing its antibacterial properties. However, during installation, the outer UV-protective layer of existing pipes is easily scratched by the ground, allowing external ultraviolet rays to penetrate through these scratches and enter the pipe, leading to internal bacterial growth. Utility Model Content

[0003] To address the shortcomings of existing pipes where ultraviolet rays can easily penetrate the UV protective layer after it is scratched by the ground, this invention proposes a pipe material that prevents ultraviolet rays from entering the pipe.

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

[0005] A multi-layer co-extruded polypropylene composite pipe includes an antibacterial layer, a pressure-resistant layer, and a UV protective layer extruded sequentially from the inside out. Multiple longitudinally extending bottom ribs are integrally formed on the lower side of the UV protective layer. A reference surface is formed through the lower ends of all the bottom ribs. The reference surface is set on the lower side of the UV protective layer and does not intersect. The cross-section of the bottom ribs is V-shaped. A cavity is formed between the bottom ribs and the UV protective layer. A heat insulation strip is installed in the cavity.

[0006] Through the above settings, firstly, the bottom reinforcement protects the UV protection layer, preventing it from being scratched by contact between the ground and the UV protection layer during pipe laying; secondly, the bottom reinforcement serves a positioning and support function. During laying, the bottom reinforcement is subject to wear when in contact with the ground. When installed on the ground, the bottom reinforcement supports the pipe, ensuring that the worn part of the pipe faces downwards and the upper side of the pipe is not worn, thus preventing ultraviolet rays from entering the pipe; thirdly, the bottom reinforcement has an embedded insulation strip, reducing the heat transfer from the pipe to the ground and improving insulation performance.

[0007] Furthermore, two bottom ribs are provided, symmetrically positioned on the underside of the UV protective layer.

[0008] With the above setup, fewer bottom reinforcement bars are needed, saving materials and costs.

[0009] Furthermore, a downward-facing mounting groove is formed between the two bottom ribs. The pipe also includes an insulation sheet installed in the mounting groove. The insulation sheet is attached to the lower side of the UV protection layer, and the reference surface is set on the lower side of the insulation sheet and does not intersect with it.

[0010] The above settings further enhance the thermal insulation properties of the pipes.

[0011] Furthermore, the width of the mounting groove opening is smaller than the width of the mounting groove bottom, and the left and right sides of the insulation sheet are fitted with the bottom reinforcement to be secured in the mounting groove.

[0012] The above settings facilitate the installation of insulation sheets.

[0013] Furthermore, the distance from the lower end of one bottom rib to the lower end of another bottom rib is d, the outer diameter of the UV protective layer is r, and 20% <d / r<40%。

[0014] The above settings facilitate bending of the pipe to the left and right.

[0015] Furthermore, the insulation sheet is made of foam material.

[0016] The above settings enable the insulation sheet to have good heat retention properties.

[0017] Furthermore, the insulation strip is made of foam material.

[0018] The above settings enable the insulation strip to have good heat retention properties. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the pipe used in an embodiment.

[0020] Figure 2 This is a cross-sectional view of the pipe used in an embodiment.

[0021] Figure 3 This is a schematic diagram of pipes installed on the ground as an example. Detailed Implementation

[0022] The technical solution of this utility model will be further described in detail below through embodiments and in conjunction with the accompanying drawings.

[0023] like Figures 1 to 3 A multi-layer co-extruded polypropylene composite pipe includes an antibacterial layer 3, a pressure-resistant layer 4, and a UV protective layer 5 extruded sequentially from the inside out. Multiple longitudinally extending bottom ribs 6 are integrally formed on the lower side of the UV protective layer 5. A reference surface 101 is formed through the lower ends of all the bottom ribs 6. The reference surface 101 is located on the lower side of the UV protective layer 5 and does not intersect. The cross-section of the bottom ribs 6 is V-shaped. A cavity is formed between the bottom ribs 6 and the UV protective layer 5. A heat insulation strip 7 is provided in the cavity.

[0024] Through the above settings, firstly, the bottom rib 6 protects the UV protective layer 5, preventing the UV protective layer 5 from being scratched when the ground comes into contact with it during pipe laying; secondly, the bottom rib 6 plays a positioning and supporting role. When laying, the bottom rib 6 is worn due to contact with the ground. When installed on the ground, the bottom rib 6 supports the pipe, so that the worn part of the pipe faces downward and the upper side of the pipe is not worn, preventing ultraviolet rays from entering the pipe; thirdly, the bottom rib 6 has an embedded insulation strip 7, which reduces the heat transfer from the pipe to the ground and improves the insulation performance.

[0025] The antibacterial layer 3, pressure-resistant layer 4, and UV protection layer 5 of this application can all refer to existing polypropylene composite pipes. The pressure-resistant layer 4 is made of polypropylene, the antibacterial layer 3 contains nano-silver and other materials, providing antibacterial function, and the UV protection layer 5 contains UV-resistant agents, providing UV protection. The bottom rib 6 is made of the same material as the UV protection layer 5 and is integrally formed on the underside of the UV protection layer 5. The antibacterial layer 3, pressure-resistant layer 4, UV protection layer 5, and bottom rib 6 are manufactured using co-extrusion technology, which is convenient for production. Figure 2 The bottom ribs 6 are parallel to the length of the pipe, and multiple bottom ribs 6 are provided. The cross-section of the bottom ribs 6 is V-shaped, and the lower end of the bottom ribs 6 is relatively sharp to reduce the contact area with the ground. When the pipe is dragged on the ground, the bottom ribs 6 contact the ground, and the resistance to dragging the pipe forward is small. In addition, when the pipe is installed on the ground, the heat transfer from the pipe to the ground is reduced, thereby improving the thermal insulation. The thermal insulation strip 7 further improves the thermal insulation of the pipe. In this application, multiple bottom ribs 6 are provided, and the lower ends of all bottom ribs 6 are located on the reference surface 101. The reference surface 101 is located below the UV protective layer 5. That is, when the pipe contacts the ground through the bottom ribs 6, the UV protective layer 5 will not contact the ground. When the pipe is dragged on the ground or installed on the ground, the UV protective layer 5 will not contact the ground and will not be worn. Only the bottom ribs 6 are worn. Moreover, since the bottom ribs 6 support the pipe, they can also prevent the pipe from rolling on the ground, making it convenient for the pipe to be installed and fixed on the ground.

[0026] As one implementation method, the bottom ribs 6 are set as two ribs, symmetrically arranged on the underside of the UV protective layer 5.

[0027] With the above setup, the number of bottom reinforcing bars 6 is reduced, saving materials and costs.

[0028] As one implementation method, an installation groove 8 with the groove facing downward is formed between the two bottom ribs 6. The pipe also includes an insulation sheet 9 set in the installation groove 8. The insulation sheet 9 is attached to the lower side of the UV protection layer 5. The reference surface 101 is set on the lower side of the insulation sheet 9 and does not intersect with it.

[0029] The above settings further enhance the thermal insulation properties of the pipes.

[0030] Specifically, when the pipe is installed on the ground, there are installation grooves 8 between the bottom ribs 6. The space of the installation grooves 8 can be fully utilized. Insulation sheets 9 are installed in the installation grooves 8. The insulation sheets 9 are attached to the underside of the UV protective layer 5. The insulation sheets 9 do not contact the ground. The insulation sheets 9 improve the insulation performance of the pipe.

[0031] As one implementation method, the width of the groove opening of the mounting groove 8 is smaller than the width of the bottom of the mounting groove 8, and the left and right sides of the insulation sheet 9 are attached to the bottom rib 6 to be stuck in the mounting groove 8.

[0032] The above settings facilitate the installation of the insulation sheet 9.

[0033] like Figure 3 The lower right side wall of the bottom rib 6 on the left side tilts to the right, and the lower left side wall of the bottom rib 6 on the right side tilts to the left, causing the groove of the mounting groove 8 to shrink inward. The insulation sheet 9 is made of elastic material. After the insulation sheet 9 is inserted into the mounting groove 8, the upper side of the insulation sheet 9 is attached to the lower side of the UV protective layer 5. The left and right sides of the insulation sheet 9 are in contact with the bottom ribs 6 on the left and right sides respectively, preventing the insulation sheet 9 from moving up and down in the mounting groove 8.

[0034] As one implementation, the distance from the lower end of one bottom rib 6 to the lower end of another bottom rib 6 is d, the outer diameter of the UV protective layer 5 is r, and 20% <d / r<40%。

[0035] The above settings facilitate bending of the pipe to the left and right.

[0036] As one implementation method, the insulation sheet 9 is made of foam material.

[0037] The above settings enable the insulation sheet 9 to have good heat preservation properties.

[0038] As one implementation method, the insulation strip 7 is made of foam material.

[0039] The above settings enable the insulation strip 7 to have good heat preservation properties.

[0040] 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 multilayer coextruded polypropylene composite pipe, characterized in that, It includes an antibacterial layer, a pressure-resistant layer, and a UV protection layer extruded sequentially from the inside out. The UV protection layer has multiple longitudinally extending bottom ribs integrally formed on its lower side. A reference surface is formed through the lower ends of all the bottom ribs. The reference surface is located on the lower side of the UV protection layer and does not intersect. The bottom ribs have a V-shaped cross-section. A cavity is formed between the bottom ribs and the UV protection layer. A heat insulation strip is provided in the cavity.

2. A multi-layer co-extruded polypropylene composite pipe according to claim 1, characterized in that, The bottom ribs are configured as two ribs, symmetrically arranged on the underside of the UV protective layer.

3. A multi-layer co-extruded polypropylene composite pipe according to claim 2, characterized in that, A downward-facing mounting groove is formed between the two bottom ribs. The pipe also includes an insulation sheet disposed in the mounting groove. The insulation sheet is attached to the lower side of the UV protection layer, and the reference surface is disposed on the lower side of the insulation sheet and does not intersect with it.

4. A multi-layer co-extruded polypropylene composite pipe according to claim 3, characterized in that, The width of the mounting groove opening is smaller than the width of the bottom of the mounting groove, and the left and right sides of the insulation sheet are fitted with the bottom rib to be stuck in the mounting groove.

5. A multi-layer co-extruded polypropylene composite pipe according to claim 3, characterized in that, The distance from the lower end of one bottom rib to the lower end of another bottom rib is d, and the outer diameter of the UV protective layer is r, 20%. <d / r<40%。 6. A multi-layer co-extruded polypropylene composite pipe according to claim 4, characterized in that, The insulation sheet is made of foam material.

7. A multi-layer co-extruded polypropylene composite pipe according to claim 1, characterized in that, The insulation strip is made of foam material.

Images