High-thermal-conductivity inner rib reinforced polyethylene spiral corrugated pipe
By using a bifurcated ribbed mesh and thermally conductive filler design, combined with aluminum foil connections and boron nitride gradient filler, the problem of low heat transfer efficiency in polyethylene spiral corrugated pipes is solved, achieving a synergistic improvement in high thermal conductivity and mechanical stability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-20
- Publication Date
- 2026-03-20
AI Technical Summary
Existing polyethylene spiral corrugated pipes have low heat transfer efficiency, especially in axial heat transfer scenarios where heat is easily blocked, making it difficult to balance structural strength and thermal conductivity.
It adopts a bifurcated ribbed structure and thermally conductive filler design, combined with inner and outer intercalation layers and aluminum foil connection to form a continuous three-dimensional heat conduction path, and optimizes heat distribution through boron nitride gradient filler.
Significantly improves thermal conductivity, enhances compressive strength and ring stiffness, ensures structural integrity and interface reliability of pipes under complex working conditions, and avoids the risks of stress concentration and interface delamination.
Smart Images
Figure CN224017903U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to spiral corrugated pipe technical field, concretely relates to a high thermal conductivity inner rib reinforced polyethylene spiral corrugated pipe. BACKGROUND
[0002] The inner rib reinforced polyethylene spiral corrugated pipe has become the key pipe material in the fields of ground source heat pump underground heat exchange system, high efficiency transmission of chemical fluid and the like owing to its excellent pressure resistance, corrosion resistance and flexible construction characteristics.In the renewable energy utilization scene, such pipe material needs to have structural strength and thermal conductivity: for example, the ground source heat pump system requires that the pipeline bears the soil pressure while realizing the efficient heat exchange between the underground and the circulating medium; the chemical heat exchange pipeline needs to maintain stable heat conduction efficiency in the strong corrosion environment.
[0003] To adapt to the high thermal conductivity demand, the prior art optimizes the heat transfer path through the multilayer composite structure.A typical design adopts PE / graphene composite material as the intermediate layer to improve the overall thermal conductivity of the pipe wall by using the two-dimensional thermal conduction network of graphene; another scheme embeds an aluminum foil corrugated layer in the outer layer of the pipe material to accelerate heat dissipation by the high thermal conductivity of the metal.However, the inherent low thermal conductivity of the polyethylene matrix still limits its heat exchange efficiency, especially in the axial heat transfer scene, heat is prone to form a blockage in the pure PE layer.
[0004] Therefore, there is an urgent need for a high thermal conductivity inner rib reinforced polyethylene spiral corrugated pipe that deeply integrates the mechanical support function and the thermal conductivity enhancement feature to construct a composite pipeline structure that takes into account the structural strength and the heat conduction efficiency. UTILITY MODEL CONTENTS
[0005] Therefore, the utility model aims at providing a high thermal conductivity inner rib reinforced polyethylene spiral corrugated pipe to solve the problem of low heat transfer efficiency of the existing multilayer composite structure.
[0006] In order to achieve the above-mentioned purpose, the utility model provides the following technical scheme:
[0007] The high thermal conductivity inner rib reinforced polyethylene spiral corrugated pipe comprises a pipe body, the pipe body comprises a smooth inner layer, a spiral corrugated outer layer and a thermal conductivity enhancement rib layer arranged between the smooth inner layer and the spiral corrugated outer layer; the thermal conductivity enhancement rib layer comprises an inner embedded layer, an outer embedded layer and a bifurcated rib network arranged between the inner embedded layer and the outer embedded layer; the inner embedded layer and the outer embedded layer are filled with a thermal conductivity filler; the bifurcated rib network comprises a plurality of main ribs and secondary ribs; a plurality of the main ribs are arranged circumferentially along the pipe body, a plurality of the secondary ribs are divided along the length direction on both sides of each main rib, and two corresponding secondary ribs between every two adjacent main ribs are connected in a staggered manner.
[0008] As a further embodiment of this utility model: the outer surface of the smooth inner layer is provided with a protrusion, the inner surface of the inner interlocking layer is provided with a groove, and the protrusion can cooperate with the groove to form a mechanical interlock.
[0009] As a further embodiment of this utility model, the spiral corrugated outer layer is connected to the outer interlocking layer by aluminum foil.
[0010] As a further embodiment of this utility model: the thermally conductive filler contains boron nitride, and the content of boron nitride gradually decreases from the inside of the tube to the outside of the tube, and from the inlet end to the outlet end.
[0011] As a further improvement of this utility model, the number of main ribs is 12, and all 12 main ribs are parallel to the axial direction of the tube body.
[0012] As a further embodiment of this utility model: the angle between the secondary rib and the main rib is 60°, and the distance between two adjacent secondary ribs is 15mm.
[0013] By adopting the above technical solution, this utility model will have the following beneficial effects:
[0014] The high thermal conductivity internally ribbed reinforced polyethylene spiral corrugated pipe provided by this utility model achieves the following through the design of the bifurcated rib mesh and thermally conductive filler: 1. Significantly improved thermal conductivity: the circumferential arrangement of the main ribs forms a basic thermally conductive skeleton, and the staggered connection of the secondary ribs significantly increases the effective heat transfer area; combined with the thermally conductive filler filled between the inner / outer interlayers, it achieves efficient heat diffusion along the axial and circumferential directions, greatly improving the axial thermal conductivity; 2. Comprehensive strengthening of mechanical support: the staggered connection of the bifurcated secondary ribs forms a honeycomb-like micro-support unit in the pipe wall, simultaneously enhancing compressive strength and ring stiffness; 3. Long-term stable interlayer bonding: the inner / outer interlayer and the bifurcated rib mesh are integrally formed, ensuring the structural integrity and interface reliability of the pipe under complex working conditions.
[0015] Compared with the multi-layer composite structure of the prior art, this utility model constructs a three-dimensional continuous heat conduction path through a branched rib network, avoiding the stress concentration problem caused by the uneven dispersion of traditional graphene. It replaces the whole metal layer with a thermally conductive filler, eliminating the risk of interface peeling caused by thermal expansion differences, and achieving a synergistic improvement in thermal conductivity and mechanical stability. Attached Figure Description
[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0017] Figure 1 This is a cross-sectional view of the high thermal conductivity internally ribbed reinforced polyethylene spiral corrugated pipe according to an embodiment of the present invention.
[0018] Figure 2 for Figure 1 A perspective view of the high thermal conductivity internally reinforced polyethylene spiral corrugated pipe described in the embodiment;
[0019] Figure 3 for Figure 1 A perspective view of the inner wall structure of the high thermal conductivity internally reinforced polyethylene spiral corrugated pipe described in the embodiment.
[0020] The correspondence between the labels and component names in the attached figures is as follows:
[0021] 1. Smooth inner layer; 2. Spiral corrugated outer layer; 3. Thermally conductive reinforcing rib layer; 31. Inner interlocking layer; 32. Outer interlocking layer; 33. Branched rib mesh; 331. Main rib; 332. Secondary rib. Detailed Implementation
[0022] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of this invention. Therefore, the following description is to be considered exemplary in nature and not restrictive.
[0023] Please refer to Figures 1-3 In one embodiment of the high thermal conductivity internally reinforced polyethylene spiral corrugated pipe provided by this utility model, the high thermal conductivity internally reinforced polyethylene spiral corrugated pipe includes a pipe body, the pipe body including a smooth inner layer 1, a spiral corrugated outer layer 2, and a thermally conductive reinforcing rib layer 3 disposed between the smooth inner layer 1 and the spiral corrugated outer layer 2:
[0024] The thermally conductive reinforcing rib layer 3 includes an inner intercalation layer 31, an outer intercalation layer 32, and a branched rib network 33 disposed between the inner intercalation layer 31 and the outer intercalation layer 32. Thermally conductive filler is used to fill the space between the inner intercalation layer 31 and the outer intercalation layer 32 to improve the thermal conductivity of the tube. The branched rib network 33 includes 12 main ribs 331 and multiple secondary ribs 332. The 12 main ribs 331 are evenly distributed along the circumference of the tube (one rib is set every 30° along the circumference), and all 12 main ribs 331 are parallel to the axial direction of the tube. The cross-section of each main rib 331 is rectangular, with a width of 3.0 mm and a height of 4.0 mm. The secondary ribs 332 branch off from both sides of the main ribs 331 every 15 mm, forming a 60° angle with the main ribs 331. The cross-section is circular with a diameter of 1.5 mm. The ends of the secondary ribs 332 are staggered and welded to the secondary ribs 332 of adjacent main ribs 331, forming a honeycomb-like continuous network.
[0025] In this embodiment, as heat is rapidly transferred along the main rib 331, the secondary rib 332 provides a lateral diversion channel to avoid localized heat accumulation. Furthermore, the bifurcated rib mesh 33 increases the effective heat-conducting cross-sectional area, enhancing the axial heat conduction velocity. In addition, the bifurcated secondary ribs 332 form honeycomb-like micro-support units in the circumferential direction of the tube, increasing the support point density. Combined with the bifurcated rib mesh forming a continuous support skeleton in the axial, circumferential, and radial directions, concentrated loads can be decomposed into multi-level ribs (main rib 331 → secondary rib 332 → end micro-ribs), reducing stress peak values and improving ring stiffness.
[0026] As a preferred embodiment, the outer surface of the smooth inner layer 1 is formed with a plurality of uniformly distributed protrusions by molding. The protrusions are in the shape of a regular square pyramid. Correspondingly, the inner surface of the inner intercalation layer 31 is formed with grooves by molding. The protrusions can be embedded in the grooves and are interference-fitted with the grooves. The elastic recovery of the PE melt is used to achieve a tight mechanical interlock. This can increase the contact area between the smooth inner layer 1 and the thermally conductive reinforcing rib layer 3 and suppress interlayer peeling.
[0027] As a preferred embodiment, an aluminum foil mesh is pre-embedded in the inner wall of the spiral corrugated outer layer 2. The aluminum foil mesh is a mesh structure made of aluminum foil material. At the softening temperature of the thermally conductive reinforcing rib layer 3, the outer surface of the outer interlocking layer 32 is bonded to the aluminum foil mesh by hot pressing. This connection method can reduce the air gap or oxide layer between the interfaces and improve the heat conduction efficiency.
[0028] As a preferred embodiment, the thermally conductive filler contains boron nitride. The layered structure of hexagonal boron nitride gives it extremely high thermal conductivity in the in-plane direction, far exceeding that of traditional oxide fillers (such as alumina and zinc oxide). The boron nitride content gradually decreases from the inside of the tube to the outside of the tube and from the inlet end to the outlet end, so as to realize the automatic guidance of heat from the high thermal conductivity zone to the low thermal conductivity zone and reduce ineffective heat loss.
[0029] The method of use or working principle of this utility model is as follows:
[0030] This solution constructs a thermally conductive reinforcing rib layer 3, forming a continuous three-dimensional thermally conductive skeleton inside the polyethylene pipe wall. Combined with the directional distribution of boron nitride gradient filler and the micro-protrusion / aluminum foil mesh interface treatment, it achieves rapid heat conduction along the axial direction. At the same time, it utilizes the honeycomb mechanical support structure of the bifurcated rib mesh to enhance the ring stiffness. Through melt co-extrusion, the thermally conductive reinforcing rib layer 3 and the spiral corrugated outer layer 2 are integrally formed. While maintaining the pipe's pressure resistance and impact resistance, it improves the axial thermal conductivity, meeting the stringent requirements of high thermal conductivity and pressure resistance pipes in scenarios such as ground source heat pumps and chemical heat exchange.
[0031] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.
Claims
1. A high thermal conductivity inner rib reinforced polyethylene spiral corrugated pipe, comprising a pipe body, said pipe body comprising a smooth inner layer (1) and a spiral corrugated outer layer (2), characterized in that, The tube body further includes a thermally conductive reinforcing rib layer (3) disposed between the smooth inner layer (1) and the spiral corrugated outer layer (2); the thermally conductive reinforcing rib layer (3) includes an inner interlocking layer (31), an outer interlocking layer (32) and a branched rib mesh (33) disposed between the inner interlocking layer (31) and the outer interlocking layer (32); the space between the inner interlocking layer (31) and the outer interlocking layer (32) is filled with thermally conductive filler; the branched rib mesh (33) includes multiple main ribs (331) and secondary ribs (332); the multiple main ribs (331) are arranged circumferentially along the tube body, and multiple secondary ribs (332) are branched off on both sides of each main rib (331) along the length direction, and the corresponding two secondary ribs (332) between each two adjacent main ribs (331) are staggered.
2. The high thermal conductivity internally reinforced polyethylene spiral corrugated pipe according to claim 1, characterized in that, The outer surface of the smooth inner layer (1) is provided with protrusions, and the inner surface of the inner interlocking layer (31) is provided with grooves. The protrusions can cooperate with the grooves to form a mechanical interlock.
3. The high thermal conductivity internally reinforced polyethylene spiral corrugated pipe according to claim 1, characterized in that, The spiral corrugated outer layer (2) is connected to the outer interlocking layer (32) by aluminum foil.
4. The high thermal conductivity internally reinforced polyethylene spiral corrugated pipe according to claim 1, characterized in that, The thermally conductive packing contains boron nitride, and the boron nitride content gradually decreases from the inside of the tube to the outside of the tube, and from the inlet end to the outlet end.
5. The high thermal conductivity internally reinforced polyethylene spiral corrugated pipe according to claim 1, characterized in that, The number of main ribs (331) is 12, and all 12 main ribs (331) are parallel to the axial direction of the tube body.
6. The high thermal conductivity internally reinforced polyethylene spiral corrugated pipe according to claim 1, characterized in that, The angle between the secondary rib (332) and the main rib (331) is 60°, and the distance between two adjacent secondary ribs (332) is 15mm.