Low-shrinkage high-transparency PERT (polyethylene of raised temperature resistance) floor heating pipe

Abstract

The utility model relates to the technical field of floor heating pipes, and discloses a low-shrinkage high-transparency PERT floor heating pipe which comprises an inner pipe layer, reinforcing ribs and an outer pipe layer which are sequentially arranged from inside to outside. The inner pipe layer is in a hollow cylinder shape and is made of high-transparency PERT materials, and a plurality of annular wave-shaped structures are arranged on the outer wall of the inner pipe layer. The reinforcing ribs are arranged in the axial direction of the pipe, are of a plurality of longitudinal wave-shaped structures and are attached to the wave crests of the inner pipe layer. The outer pipe layer wraps the outer sides of the reinforcing ribs and has good transparency and a protection function. According to the structure, deformation caused by thermal expansion and cold contraction is limited through cooperation of the wave-shaped inner wall and the longitudinal reinforcing ribs, the size stability of the pipe is improved, and the pipe has good transparency, is convenient to construct, observe and maintain and is suitable for application scenes of floor heating systems and transparent visual pipelines.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of floor heating pipeline, more specifically to a low shrinkage high transparency PERT floor heating pipe. BACKGROUND

[0002] With the continuous improvement of people's living standards, the floor radiant heating (referred to as "floor heating") system is widely used in residential, office building, commercial building and other buildings due to its comfort, energy saving, high thermal efficiency and other advantages. In the floor heating system, pipe material is an important carrier for hot water or low-temperature heat medium circulation, and its performance is directly related to the safety, stability and service life of the system operation. At present, the PERT (high temperature resistant polyethylene) material is widely used in the market to make floor heating pipes, which have good high temperature resistance, flexibility and processability, and gradually become one of the mainstream products of floor heating pipes.

[0003] However, the existing PERT floor heating pipe still has the following defects in use:

[0004] 1. Obvious thermal expansion and contraction problem: The periodic operation of the floor heating system will cause the pipe to be repeatedly heated and cooled, and the traditional PERT pipe is prone to obvious axial shrinkage after long-term use, which leads to stress concentration at the interface, system sealing failure, and even causes the risk of floor cracking or leakage.

[0005] 2. Insufficient transparency, which is not conducive to construction detection: Most of the current PERT pipes are opaque in appearance, and it is impossible to visually judge whether there are inclusions, impurities or blockage inside during installation, which is also not conducive to the inspection and maintenance of construction quality.

[0006] 3. Limited deformation resistance: The traditional single-layer or thin-walled structure PERT pipe is prone to bulging and deformation under the action of high-temperature water flow impact or external pressure, which affects the overall system stability.

[0007] 4. Single structure and limited function: Some existing pipes use thickening design to increase strength, which improves the pressure-bearing capacity, but sacrifices flexibility and construction convenience; and there is no effective means to limit its radial and axial deformation at high temperature.

[0008] In summary, the PERT floor heating pipe in the prior art still has many shortcomings in size stability, service life, visualization degree and construction convenience. Therefore, it is urgent to provide a new PERT floor heating pipe with optimized structure, strong low shrinkage and high transparency to solve the above problems and improve the overall performance and construction efficiency of the floor heating system. Utility model content

[0009] The utility model provides a kind of low shrinkage high transparency PERT floor heating pipe material, by being provided with longitudinal wavy reinforcing rib in pipe material structure, effectively limit the deformation of inner tube under thermal expansion, improve dimensional stability, simultaneously by using high transparency material, pipe material has good visibility, it is convenient to install and maintain.

[0010] In order to realize the above-mentioned purpose, the utility model provides a kind of PERT pipeline of chemical reaction kettle heating system, including following structure:

[0011] Outer pipe layer, cladding in the outside of the reinforcing rib, adopt transparent PERT material to make, for forming the external protective structure of pipe material;

[0012] Reinforcing rib, be provided in the outer wall of the inner pipe layer, it is arranged as multiple longitudinal wavy structures along the axial direction of pipe material, adopt transparent material to make;

[0013] Inner pipe layer, for hollow cylindrical structure, adopt transparent PERT material to make, for bearing the working pressure in floor heating system, the outer wall of the inner pipe layer is equipped with multiple annular wavy structures distributed along the circumferential direction.

[0014] Preferably, each recess section of the annular wavy structure is arranged between two adjacent reinforcing ribs, and each wave peak section is arranged corresponding to the corresponding reinforcing rib.

[0015] Preferably, the thickness of the inner pipe layer is 1.5mm to 2.0mm.

[0016] Preferably, the thickness of the outer pipe layer is 0.5mm to 0.8mm.

[0017] Preferably, the reinforcing rib and the inner pipe layer are formed by integral co-extrusion, and are connected with the wave peak section of the surface of the inner pipe layer.

[0018] Preferably, the inner pipe layer, reinforcing rib and outer pipe layer form a three-layer composite structure to enhance the mechanical strength and thermal stability of the pipe.

[0019] Via the technical solution described above, compared with the prior art, the utility model has the beneficial effects as follows:

[0020] (1) strong heat expansion resistance: by setting longitudinal wavy reinforcing rib, effectively inhibit the radial and axial deformation of inner pipe layer under heating, significantly reduce the shrinkage of pipe material, prolong the service life;

[0021] (2) high transparency design: each layer of pipe material is made of transparent PERT material, especially the outer pipe layer has good light transmittance, which facilitates the observation of water flow, scaling and other conditions in the pipeline, and improves construction and operation efficiency;

[0022] (3) Structure is reasonable, high strength: three layer composite structure design, on the basis of maintaining flexibility, improve the overall mechanical strength of pipe, suitable for long time stable operation in the floor heating system. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical scheme in the embodiments of the present application or prior art, the drawings needed to be used in the embodiment or prior art description will be briefly introduced below, and obviously, the drawings in the following description are only embodiments of the present application, and for those skilled in the art, other drawings can be obtained without creative labor on the premise of providing the drawings.

[0024] Figure 1 It is a sectional structure schematic view of the present application.

[0025] Figure 2 It is a three-dimensional structure schematic view of the present application.

[0026] 1-outer pipe layer, 2-stiffener, 3-inner pipe layer. DETAILED DESCRIPTION

[0027] The technical scheme in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application, and obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the present application.

[0028] EMBODIMENT

[0029] As shown in Figure 1 and Figure 2 , a low shrinkage high transparency PERT floor heating pipe material, comprising inner pipe layer 3, stiffener 2 and outer pipe layer 1 arranged in turn from inside to outside, which is effectively solved by three layer co-extrusion molding structure design the problem of size instability, poor visibility and insufficient structural strength of the existing floor heating pipe material in the process of thermal expansion and contraction.

[0030] The inner pipe layer 3 is the innermost layer structure of the pipe material, which is a hollow cylindrical shape, and is the main passage of the heat medium flow in the floor heating system, and is also the main part of the pressure. The inner pipe layer 3 is made of modified high transparency PERT (high temperature resistant polyethylene) material, which has excellent thermal stability, flexibility and molding processing performance, and is suitable for long-term operation in the floor heating environment of 40℃-80℃.

[0031] The wall thickness of the layer is designed between 1.5mm and 2.0mm to balance the pressure bearing capacity and softness, so that it can adapt to the bending and coiling requirements in the construction of the floor heating system. In order to enhance the dimensional stability of the pipe during heating, the outer wall of the inner pipe layer is designed as a plurality of evenly distributed ring-shaped wave structures, and the wave direction is developed along the pipe circumference. The wave peak of each wave structure is connected with the reinforcing rib 2, and the wave valley is located between two adjacent reinforcing ribs. The structure can provide a certain elastic buffer space for the inner pipe layer during thermal expansion and contraction, thereby reducing the dimensional change caused by thermal stress and improving the dimensional stability.

[0032] In addition, the wave-shaped structure is synchronously formed in the mold, and the forming precision is high. The stable extrusion can be realized through the internal spiral shunt channel of the die head and the wave peak template setting, which is suitable for automatic mass production.

[0033] In order to further improve the structural strength and thermal deformation resistance of the inner pipe layer, a plurality of reinforcing ribs 2 are arranged on the outer wall of the inner pipe layer 3. The material can be selected from the same or compatible transparent polyolefin materials as the inner pipe layer, such as high-transparency copolymerized polyethylene, thermoplastic elastomer (TPE), etc. The reinforcing ribs extend along the axial direction of the pipe and are distributed in a longitudinal wave shape, which accurately fits the wave peak position of the outer wall of the inner pipe layer 3.

[0034] The height of each reinforcing rib is preferably 0.4-0.6mm, the width is between 2-4mm, and the axial spacing is preferably 20-30mm. The reinforcing rib is synchronously formed with the inner pipe layer by co-extrusion process, and does not destroy the transparency, which can realize the integration of material and structure. The reinforcing rib can effectively limit the radial bulging and axial shortening of the inner pipe layer during long-term thermal cycling, and effectively prolong the service life of the pipe.

[0035] In addition, the reinforcing rib structure has a certain elasticity and a certain deformation absorption capacity under external force, which can prevent the pipe from being flattened, bent and other situations caused by excessive extrusion or heavy pressure during construction and embedding.

[0036] The outer pipe layer 1 is arranged outside the reinforcing rib 2 and completely covers the entire pipe structure, and the thickness is preferably 0.5mm-0.8mm. The main function is to protect the inner layer structure from the influence of the external environment. The outer pipe layer is made of high-transparency PERT or optical-grade PE material, which has good weather resistance, corrosion resistance and high light transmittance, and can realize the visual monitoring of the internal operation state of the pipe.

[0037] By setting the transparent outer pipe layer, it can be directly observed whether there are water scale impurities, bubble residues, scale or foreign matter blockage and other phenomena in the pipe during the floor heating construction process, the installation and debugging efficiency is improved, and the post-maintenance risk is reduced. In addition, the outer pipe layer has a stable supporting effect on the internal reinforcing rib, which can prevent it from moving or loosening in the subsequent pressure environment, further ensuring the reliability of the overall structure of the pipe.

[0038] The floor heating pipe material is made of three layers of co-extrusion process, and the specific steps are as follows:

[0039] 1. Raw material preparation: transparent PERT raw material A (for inner pipe layer), modified transparent elastic material B (for reinforcing rib) and high transparent polyethylene raw material C (for outer pipe layer) are selected respectively, and after drying and dehumidifying treatment, they are sent into the extruder hopper.

[0040] 2. Co-extrusion molding: a three-machine co-extrusion production line is adopted, the inner pipe layer raw material A is melted and plasticized in the main machine, and the wave structure is formed through the inner mold; at the same time, the raw material B forms a wave-shaped reinforcing rib through the middle layer feeding port; the outer pipe layer raw material C forms a transparent cladding layer through the outer mold. The three layers are combined and fused in the die head to complete the composite molding of the multi-layer structure.

[0041] 3. Cooling and shaping: after extrusion, the pipe material quickly enters the vacuum cooling tank to ensure accurate structure size, complete wave-shaped structure and pipe diameter tolerance control within ±0.2mm.

[0042] 4. Traction cutting: after fixed-length traction, it is cut by automatic cutting device, and the conventional packaging length is 100 meters or 200 meters per root, which meets the demand of floor heating laying construction.

[0043] 5. Detection and packaging: the finished product is packaged into the warehouse after appearance inspection, air tightness detection, burst strength test and other quality inspection processes.

[0044] The floor heating pipe material provided by the utility model realizes excellent low shrinkage performance through the synergistic effect of the inner pipe wave structure and the external reinforcing rib. Under the simulation of 80 DEG C operating conditions, after 1000 hours of cycle test, the pipe material length change rate is controlled within 0.2%, which is significantly better than the existing straight wall pipe material (usually about 0.8%).

[0045] In addition, through the design of high transparent material and cladding structure, the flow state in the pipe is observed by naked eye, which effectively improves the controllability of construction. Compared with the traditional opaque floor heating pipe material, the pipe fault identification efficiency is improved by about 30% during the first water pressure test and water adjustment process.

[0046] The structure design has strength and flexibility at the same time, which is beneficial to coil construction and is not easy to appear wrinkles and flat. After 120 DEG bending test, the pipe material does not occur whitening and rupture, which meets the flexible laying requirements of floor heating conventional construction.

[0047] The low-shrinkage high-transparency PERT floor heating pipe provided by the utility model is suitable for the floor heating system of civil residential buildings, commercial buildings, hospitals, schools and other building sites, and can also be applied to low-temperature hot water conveying systems, buried pipe network engineering and various fluid conveying fields requiring high visualization and shrinkage resistance. According to different construction environments and heat source characteristics, the thickness or material type of the inner pipe layer and the outer pipe layer can be adjusted to realize diversified structure matching.

[0048] The above description of disclosed embodiments enables those skilled in the art to implement or use the utility model. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the utility model. Therefore, the utility model will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A low shrinkage high transparency PERT underfloor heating pipe material, characterized in that, The utility model relates to a kind of transparent pipe material, including: Inner tube layer (3), hollow cylindrical structure is used, is made of transparent PERT material, for bearing working pressure in floor heating system, the outer wall of the inner tube layer (3) is provided with multiple annular wave-shaped structures distributed in circumferential direction; Reinforcing rib (2) is arranged on the outer wall of the inner tube layer (3), and is arranged as multiple longitudinal wave-shaped structures along the axial direction of pipe material, and is made of transparent material; Outer tube layer (1) is covered on the outside of the reinforcing rib (2), and is made of transparent PERT material, for forming the external protective structure of pipe material.

2. The radiant floor tubing of claim 1 wherein: Each recess section of the annular wave-shaped structure is arranged between two adjacent reinforcing ribs (2), and each wave peak section is arranged corresponding to the corresponding reinforcing rib (2).

3. The radiant floor pipe according to claim 1, wherein: The thickness of the inner tube layer (3) is 1.5mm to 2.0mm.

4. The radiant floor heating tubing of claim 1 wherein: The thickness of the outer tube layer (1) is 0.5mm to 0.8mm.

5. The radiant floor heating tubing of claim 1 wherein: The reinforcing rib (2) and the inner tube layer (3) are formed by integral co-extrusion, and are connected with the wave peak section of the surface of the inner tube layer (3).

6. The radiant heating pipe according to any one of claims 1 to 5, wherein: The inner tube layer (3), reinforcing rib (2) and outer tube layer (1) form a three-layer composite structure to enhance the mechanical strength and thermal stability of the pipe material.

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