CN215060147U - PE pipe and water purification system - Google Patents

Abstract

The utility model discloses a PE pipe and water purification system, this PE pipe includes: the inner pipe is an anti-scale layer, the outer pipe is an anti-wear layer, the inner wall of the inner pipe is smooth, the outer pipe is coaxially sleeved outside the inner pipe, and the inner wall of the outer pipe is tightly attached to the outer wall of the inner pipe. The outer layer pipe has high wear resistance, so that the outer layer pipe can effectively protect the inner layer pipe, the inner layer pipe is not easy to damage, and bacteria are not easy to breed in the inner layer pipe.

Description

PE pipe and water purification system

Technical Field

The utility model belongs to the technical field of the tubular product technique and specifically relates to a PE pipe and water purification system is related to.

Background

The water pipe is a pipe for supplying water, and is generally required to ensure high wear resistance, corrosion resistance, and the like, whether it is delivered from an outdoor lake or reservoir to a water supply station in a city, or delivered from the water supply station to each household. Common water supply pipelines are divided into three categories, the first category is metal pipes, such as cast iron pipes, copper pipes and the like; the second type is plastic-clad metal pipes, such as steel-plastic composite pipes, aluminum-plastic composite pipes and the like; the third type is plastic tubes, such as PB tubes, PP-R tubes, etc. Because the weight of the metal pipe is large, the metal pipe is difficult to carry, and after the metal pipe is used for many years, a large amount of rust scale is easy to generate, bacteria are bred to harm the health of a human body, and therefore, the state gradually begins to popularize and use novel plastic pipes and the like.

Among the new plastic pipes, PE material is widely used in water supply systems because it is non-toxic and odorless and has good wear resistance and high pressure resistance. The existing PE pipe is easy to be collided or bent to be damaged or broken in the transportation process or the construction process, and if the damaged part is not found in time, the damaged PE pipe is applied to a water supply system, bacteria are very easy to breed in the pipe, the water quality is polluted, and the human health is influenced.

SUMMERY OF THE UTILITY MODEL

In view of the above, it is necessary to provide a PE pipe having high resistance to bacteria and high abrasion.

A PE tube, comprising: the inner-layer pipe is an anti-scaling layer, the outer-layer pipe is an anti-wear layer, the inner wall of the inner-layer pipe is smooth, the outer-layer pipe is coaxially sleeved on the outer side of the inner-layer pipe, and the inner wall of the outer-layer pipe is tightly attached to the outer wall of the inner-layer pipe.

In the PE pipeline, the inner layer pipe is an anti-scaling layer, the outer layer pipe is an anti-wear layer, the outer layer pipe is coaxially sleeved on the outer layer of the inner layer pipe, and the inner wall of the outer layer pipe is tightly attached to the outer wall of the inner layer pipe, so that the outer layer pipe effectively protects the inner layer pipe by utilizing the higher wear-resisting property of the outer layer pipe, the inner layer pipe is not easy to damage, and bacteria are not easy to breed in the inner layer pipe.

The technical solution is further explained below:

in one embodiment, the wall thickness of the outer tube is 0.2mm to 0.5 mm.

In one embodiment, the wall thickness of the inner tube is 1mm-2 mm.

In one embodiment, the wall thickness of the outer layer tube is 0.35mm, and the wall thickness of the inner layer tube is 1.5 mm.

In one embodiment, the outer diameter of the inner tube ranges from 7.35mm to 11.52 mm; and/or the inner diameter range of the outer layer pipe is 7.35mm-11.52mm, and the outer diameter value of the inner layer pipe is the same as the inner diameter value of the outer layer pipe.

In one embodiment, the outer tube is integrally formed on the outside of the inner tube.

In one embodiment, the outer tube is an HDPE resin.

In one embodiment, the inner tube is an LDPE resin or an LLDPE resin.

In one embodiment, the outer tube is a different color than the inner tube.

The application still relates to a water purification system, include as above PE manage, still include water purification unit, the PE manage with water purification unit is connected, just the PE pipe be used for to water purification unit supplies water.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification.

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

Furthermore, the drawings are not to scale of 1:1, and the relative dimensions of the various elements in the drawings are drawn only by way of example and not necessarily to true scale. In the drawings:

fig. 1 is a schematic structural diagram of a PE tube according to an embodiment of the present invention.

The elements in the figure are labeled as follows:

10. an inner layer tube; 20. an outer tube.

Detailed Description

In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, as those skilled in the art will be able to make similar modifications without departing from the spirit and scope of the present invention.

Referring to fig. 1, an embodiment provides a PE pipe, including: an inner tube 10 and an outer tube 20. The inner layer pipe 10 is an anti-scaling layer, and the outer layer pipe 20 is an anti-wear layer. The inner wall of the inner layer pipe 10 is smooth, the outer layer pipe 20 is coaxially sleeved on the outer side of the inner layer pipe, and the inner wall of the outer layer pipe 20 is tightly attached to the outer wall of the inner layer pipe 10.

The water pipe is a pipe for supplying water, and the pipe for supplying water generally should have high wear resistance, corrosion resistance, and the like. And the common metal pipe has difficulty in carrying due to large self weight, and is easy to generate rust scale, breed bacteria and harm human health, and the like, so that the country gradually begins to popularize and use novel materials, such as PE pipes. The existing PE pipe is easy to be collided or bent to be damaged in the transportation process or the construction process, and bacteria are extremely easy to breed in the pipe to pollute the water and influence the health of human bodies. In this embodiment, the PE pipe includes an inner layer pipe 10 and an outer layer pipe 20, the inner layer pipe 10 is an anti-scaling layer, the outer layer pipe 20 is an anti-wear layer, the outer layer pipe 20 is coaxially sleeved outside the inner layer pipe 10, and the inner wall of the outer layer pipe 20 is closely attached to the outer wall of the inner layer pipe 10. Therefore, the outer tube 20 can effectively protect the inner tube 10 by utilizing its high wear resistance, so that the inner tube 10 is not easily damaged and bacteria are not easily propagated in the inner tube 10.

Referring to fig. 1, in an embodiment based on the above embodiment, the wall thickness of the outer tube 20 is 0.2mm to 0.5 mm. The wall thickness of the outer layer pipe 20 is set to 0.2mm-0.5mm, so that the weight of the PE pipe can be effectively reduced while the outer layer pipe 20 has good abrasion resistance, and the physical consumption of constructors in carrying or installing the PE pipe is reduced.

On the basis of the above embodiment, in one embodiment, the wall thickness of the inner layer tube 10 is 1mm-2 mm. The wall thickness of the inner layer pipe 10 is set to be 1mm-2mm, so that the weight of the PE pipe can be effectively reduced while the inner layer pipe 10 is guaranteed to have enough wall thickness to bear water flow impact in the pipe, and physical consumption of constructors in the process of carrying or installing the PE pipe is reduced.

In addition to the above embodiments, in one embodiment, the wall thickness of the outer tube 20 is 0.35mm, and the wall thickness of the inner tube 10 is 1.5 mm.

On the basis of the above embodiment, in one embodiment, the outer diameter of the inner layer pipe 10 ranges from 7.35mm to 11.52 mm; and/or the inner diameter of the outer layer tube 20 ranges from 7.35mm to 11.52mm, and the outer diameter of the inner layer tube 10 is the same as the inner diameter of the outer layer tube 20. Because the internal diameter value of outer pipe 20 is the same with the external diameter value of inlayer pipe 10, makes the inner wall of outer pipe 20 hug closely in the outer wall of inlayer pipe 10, provides good protection effect for inlayer pipe 10, can prevent effectively that inlayer pipe 10 from causing whole PE pipe can not continue to use because of colliding with or scraping the damage. Therefore, the cost of a construction unit can be reduced by arranging the outer layer pipe 20, and waste is not easy to cause.

Optionally, in another embodiment, the inner diameter of the outer tube 20 is larger than the outer diameter of the inner tube 10, and an insulating layer is disposed between the inner tube 10 and the outer tube 20. Because winter temperature is lower, especially north, when using this PE pipe winter, the low temperature can lead to the water in the PE pipe to freeze, and the water density after freezing diminishes, finally leads to the volume of ice to be greater than the volume of water, and like this, the volume expansion can lead to the PE pipe to take place to break, sets up the heat preservation that has the effect of insulating against the temperature and can reduce the possibility of freezing, has guaranteed the safety in utilization of PE pipe. In addition, the frozen water cannot be timely and effectively conveyed to users or related equipment adopting the PE pipe, and the water supply efficiency is easily influenced.

Optionally, in another embodiment, the insulation layer is a phenolic resin foam tube. The phenolic resin foaming cotton pipe is formed by condensation polymerization of phenol and formaldehyde, and is formed into a pipeline after foaming and curing. In the foaming production process, freon is not used as a foaming agent, the foaming agent meets the international environmental protection standard, the molecular structure of the foaming agent contains hydrogen, oxygen and carbon elements, and overflowed gas is nontoxic and tasteless during pyrolysis and is harmless to human bodies and the environment, so that the foaming agent meets the national green environmental protection requirement, and the safety of the PE pipe is ensured. The phenolic resin foam cotton has high closed-cell rate, low heat conductivity coefficient, good heat insulation performance, water resistance and water vapor permeability, and can improve the heat insulation performance and safety of the PE pipe. Meanwhile, the use temperature range of the phenolic resin foam cotton is-196 ℃ to +200 ℃, and the PE pipe does not shrink or embrittle in a low-temperature environment, so that the reliability of the PE pipe is improved.

In another embodiment, the insulation layer is a polyurethane foam tube. The polyurethane foam tube is prepared by using a high-function polyether polyol composite material and multi-time methyl polyphenyl polyisocyanate as raw materials and foaming the raw materials through chemical reaction. The polyurethane foam can be firmly bonded with various materials, is simple and convenient to construct, effectively reduces the construction cost, has obvious heat insulation, sound insulation, flame retardance, cold resistance, no water absorption, energy conservation and corrosion prevention effects, and is widely applied to various pipelines for heat supply, refrigeration, oil transportation, steam transportation and the like. The adaptive temperature of the polyurethane foam pipe is-196 ℃ to +120 ℃, so that the reliability of the PE pipe is ensured.

Optionally, in another embodiment, the inner diameter of the outer tube 20 is larger than the outer diameter of the inner tube 10, and a buffer layer is disposed between the inner tube 10 and the outer tube 20. Therefore, when the PE pipe is subjected to external force impact in the carrying or installation and use process, the buffer layer can weaken part of impact force, the inner-layer pipe 10 is protected from being damaged easily, and the use cost of the PE pipe is reduced.

In addition to the above embodiments, in one embodiment, the outer tube 20 is made of HDPE resin. HDPE is an abbreviation of High Density Polyethylene English High Density Polyethylene, and HDPE resin has High wear resistance, electrical insulation, toughness and cold resistance; meanwhile, the HDPE resin has good chemical stability, is insoluble in any organic solvent at room temperature, and is resistant to corrosion of acid, alkali and various salts. Therefore, the high-density polyethylene pipe made of HDPE resin is lighter than concrete pipelines, galvanized pipes and steel pipes, is easier to carry and install, has lower manpower and equipment requirements, greatly reduces the construction difficulty and the construction cost, and improves the construction efficiency. Meanwhile, the high-density polyethylene pipe has good impact resistance, the maximum bearing pressure of the high-density polyethylene pipe is 1.25MPa, the high-density polyethylene pipe has low notch sensitivity, high shear strength and excellent scratch resistance, the environmental stress cracking resistance is very outstanding, and the high construction safety of the PE pipe is ensured. The high-density polyethylene pipe can resist corrosion of various chemical media, cannot generate phenomena of corrosion, rusting or electrochemical corrosion, cannot promote growth of algae, bacteria or fungi, and has longer service life and higher safety. The flexibility of the high density polyethylene pipe makes it easier to bend during actual installation, allowing for adaptation to the application environment.

Further, the outer tube 20 further includes a plastic anti-aging agent, a wear-resistant auxiliary agent, and the like. The plastic anti-aging agent is mainly used for unsaturated resin and products containing the unsaturated resin, and mainly aims to absorb ultraviolet light with the wavelength of 270-380 nm so as to improve the anti-aging performance of products adopting the plastic anti-aging agent, so that the outer layer pipe 20 is not easy to embrittle due to sunlight, and the service life of the PE pipe is prolonged. In addition, the addition of the wear-resistant auxiliary can effectively improve the wear resistance and scratch resistance of the outer layer tube 20, so that the wear resistance of the outer layer tube 20 is further improved.

On the basis of the above embodiments, in one embodiment, the inner layer tube 10 is made of LDPE resin or LLDPE resin. The LDPE is an abbreviation of Low Density Polyethylene English Low sensitivity Polyethylene, has the characteristics of no odor, no toxicity and good extensibility, and has high alkali resistance and common organic solvent resistance due to good chemical stability of the LDPE resin. LLDPE is the abbreviation of Linear Low Density Polyethylene English letter Density Polyethylene, and LLDPE resin has similar properties with LDPE resin, and compared with LDPE resin, LLDPE resin has better toughness and extensibility.

Further, the inner layer tube 10 further includes an antibacterial agent and a hydrophobic auxiliary agent. The antibacterial agent is a chemical having a killing effect or a growth-inhibiting effect on some microorganisms (bacteria, fungi, yeasts, algae, viruses, etc.), and thus the antibacterial agent may be added to kill or inhibit bacteria in the water flowing through the inner pipe 10 when the inner pipe 10 is processed. Specifically, in this embodiment, the antibacterial agent is a silver ion composite antibacterial agent, and since silver ions can effectively interfere with the synthesis of bacterial cell walls and damage bacterial cell membranes, the effect of killing or inhibiting the production of bacteria is achieved. The hydrophobic auxiliary agent has high hydrophobicity, and can prevent ions forming water scale from being gathered and attached to the pipe wall while repelling water molecules, so that the water supply efficiency of the inner-layer pipe 10 is ensured. When in processing, the hydrophobic auxiliary agent and the material for forming the tube body of the inner tube 10, namely LDPE resin or LLDPE resin, are poured into the extruder together, so that the hydrophobic auxiliary agent is melted into the tube body to form the scale prevention layer, thereby effectively preventing bacteria and microorganisms from being attached to the tube wall and having good self-cleaning effect. The inner pipe 10 has antibacterial and antiscaling properties, and under the dual functions of the antibacterial and antiscaling properties, bacteria, microorganisms and scale can be effectively prevented from breeding in the inner pipe 10, and the quality of domestic water is improved.

In addition to the above embodiments, in one embodiment, the outer tube 20 is integrally formed on the outer side of the inner tube 10. Putting two different pipe raw materials into two single-screw extruders, forming two inner-layer pipes 10 and outer-layer pipes 20 with different characteristics through the two single-screw extruders, fusing the two inner-layer pipes 10 and the outer-layer pipes 20 with different characteristics through a composite die, forming a pipe blank through an oral die, sizing by a sizing sleeve under a vacuum environment, cooling in a water tank, marking, selecting length, cutting, and finally forming the required PE pipe. In the specific production process, the wall thicknesses of the inner layer pipe 10 and the outer layer pipe 20 are controlled by controlling the screw rotating speed and the production line traction speed of the two single screw extruders, so that the wall thickness of the inner layer pipe 10 is controlled to be between 1mm and 2mm, and the wall thickness of the outer layer pipe 20 is controlled to be between 0.2mm and 0.5 mm.

Because the inner and outer layers of pipelines are made of different materials, the thermal expansion coefficients of the pipelines are different. Therefore, in order to ensure the safety of the PE pipe under different seasonal temperature changes, in another embodiment, a buffer ring is arranged in the PE pipe. The extension performance of the buffer ring is better, and when the inner layer pipe 10 and the outer layer pipe 20 are stretched and contracted to different degrees due to temperature change, the buffer ring provides buffer to prevent the PE pipe from being damaged. Specifically, according to the distribution condition of air temperature, the natural safe length of the pipeline is directly calculated through a formula, and a buffer ring is assembled for the pipeline on the basis of the length in the production process.

On the basis of the above embodiments, in one embodiment, the color of the outer tube 20 is different from the color of the inner tube 10. In the transportation and installation process of the PE pipe, the outer layer pipe 20 of the PE pipe is easy to collide with or scratch by external gravels to form scratches, and if the scratches are too deep, the damaged part of the scratches easily generates potential safety hazards in the actual use process of the PE pipe. However, it is difficult for constructors to estimate whether the scratches exceed a certain safety limit by naked eyes in the actual construction process, and the PE pipe needs to be inspected by an instrument, which wastes time and labor. Even when the scratch appears in the PE pipe of this embodiment in transportation and installation, because the outer pipe 20 of PE pipe is different with inlayer pipe 10's colour, constructor can be through the colour of naked eye observation damaged position, judges whether this PE pipe is in safe state, decides whether continue to use this PE pipe, has effectively ensured construction safety and PE pipe's safety in utilization. If the color of the inner pipe 10 is exposed, the PE pipe cannot be used any more.

Optionally, when the inner tube 10 is processed, the color master and the material forming the tube body of the inner tube 10, i.e., the LDPE resin or the LLDPE resin, are poured into the extruder together, so that the color master is blended into the tube body to form the colored scale prevention layer, and thus, the outer tube 20 and the inner tube 10 can be effectively distinguished. When PE is damaged due to external force impact or scraping, whether the PE pipe is in a safe state or not is judged by observing the color of the damaged part through naked eyes, whether the PE pipe is continuously used or not is determined, and construction safety and use safety of the PE pipe are effectively guaranteed.

The application also relates to a water purification system. The water purification system comprises the PE pipe and water purification equipment, wherein the PE pipe is connected with the water purification equipment, and the PE pipe is used for supplying water to the water purification equipment. For example, the PE pipe includes an inner pipe 10 and an outer pipe 20. The inner layer pipe 10 is an anti-scaling layer, and the outer layer pipe 20 is an anti-wear layer. The inner wall of the inner layer pipe 10 is smooth, the outer layer pipe 20 is coaxially sleeved on the outer side of the inner layer pipe, and the inner wall of the outer layer pipe 20 is tightly attached to the outer wall of the inner layer pipe 10.

In the PE pipe and the water purification system, the inner layer pipe 10 of the PE pipe is an anti-scale layer, and the outer layer pipe 20 of the PE pipe is an anti-wear layer. The inner layer tube 10 is made of LDPE resin or LLDPE resin which is tasteless, odorless, nontoxic and has good corrosion resistance, meanwhile, as the antibacterial agent and the hydrophobic auxiliary agent are added in the inner layer tube 10, the water supply efficiency can be ensured while the drinking water safety is ensured, and in addition, in the structure of the inner layer tube 10, the inner wall is smooth, the scaling problem can be effectively improved, and the adhesion of bacteria or microorganisms is reduced. Outer pipe 20 is made by the HDPE resin that stability is high and the wearability is high, simultaneously, because still add plastics anti-aging agent and wear-resisting auxiliary agent in outer pipe 20, outer pipe 20 coaxial cover is located the outside of inlayer pipe, and the inner wall of outer pipe 20 is connected with the outer wall of inlayer pipe 10 is closely laminated, therefore outer pipe 20 can effectively protect the inlayer pipe and be difficult for receiving the damage. The water purification system adopts the PE pipe with the structure, so that the service life of the water purification system can be effectively prolonged.

Because the PE pipes are required to be connected in the water purification system so as to facilitate water supply, optionally, in another embodiment, any two PE pipes required to be connected are connected in a hot melting mode, so that the toxicity caused by glue bonding can be avoided, and the water purification system formed by the PE pipes and the water purification equipment is sanitary, healthy and environment-friendly. Wherein, the structural strength that the hot melt is connected is high, stability is good and the leakproofness preferred, can effectively guarantee that the leakage phenomenon can not appear between two PE pipes that are connected.

Optionally, in another embodiment, the water purification system further comprises a connector, and the connector is mainly used for connecting the PE pipes to be connected.

Optionally, the connector is connected to the PE tube by threads. For example, the outer surface of the connector is provided with external threads, the inner walls of the two ends of the inner pipe 10 in the PE pipe are provided with internal threads, and the connector is inserted into the inner pipe 10 to enable the internal threads to be connected with the external threads in a matched mode. For another example, the inner surface of the connector is provided with internal threads, correspondingly, the outer walls of the two ends of the outer pipe 20 in the PE pipe are provided with external threads, and the outer pipe 20 is inserted into the connector, so that the external threads are connected with the internal threads in a matching manner.

Optionally, the connecting head comprises a connecting inner layer and a connecting outer layer. Among them, since the connection inner layer is in contact with a water source in a pipe, it is preferable to use a non-toxic and odorless material such as LDPE resin or LLDPE resin. Since the outer connecting layer is exposed to the environment, it is preferable to use a strong and wear-resistant material, such as HDPE.

Because the connector is small in size and is not easy to transport or operate as a pipeline when being carried or installed for use, the connecting outer layer material of the connector is not particularly limited, and only needs to be protected to have certain hardness and wear resistance. For example, the outer connecting layer is a metal pipe, and the weight of the whole connecting head is light due to the small volume even if the metal material is arranged. As another example, the connecting outer layer is a PPR pipe. The PPR (Polypropylene-Random) tube is a Random copolymerization Polypropylene tube, and the strength and the high temperature resistance of Polypropylene are well ensured by a Random copolymerization technology. Compared with the traditional cast iron pipe, galvanized steel pipe, cement pipe and other pipelines, the PPR pipe has the advantages of energy conservation, material saving, environmental protection, light weight, high strength, corrosion resistance, smooth inner wall, no scaling, simple and convenient construction and maintenance, long service life of 50 years and the like, and is widely applied to the building industry, municipal administration, industry and agricultural field such as building water supply and drainage, urban and rural water supply and drainage, urban gas, electric power and optical cable sheath, industrial fluid transportation agricultural irrigation and the like.

Optionally, in other embodiments, the PE pipe in any of the above embodiments may also be applied to a natural gas or other transportation pipe network, and other supply systems requiring transportation of fluid.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims (10)

1. A PE tube, comprising: the inner-layer pipe is an anti-scaling layer, the outer-layer pipe is an anti-wear layer, the inner wall of the inner-layer pipe is smooth, the outer-layer pipe is coaxially sleeved on the outer side of the inner-layer pipe, and the heat-insulation layer is arranged between the inner-layer pipe and the outer-layer pipe.

2. The PE tube of claim 1 wherein the outer tube has a wall thickness of 0.2mm to 0.5 mm.

3. The PE tube of claim 2 wherein the inner tube has a wall thickness of 1mm to 2 mm.

4. The PE tube of claim 3 wherein the outer tube has a wall thickness of 0.35mm and the inner tube has a wall thickness of 1.5 mm.

5. The PE tube of claim 4 wherein the inner tube has an outer diameter in the range of 7.35mm to 11.52 mm; and/or the presence of a gas in the gas,

the inner diameter range of the outer layer pipe is 7.35mm-11.52mm, and the outer diameter of the inner layer pipe is the same as the inner diameter of the outer layer pipe.

6. The PE tube of any one of claims 1-5, wherein the outer layer tube is integrally formed on an outside of the inner layer tube.

7. The PE pipe of any one of claims 1-5 wherein the outer pipe is an HDPE resin.

8. The PE tube of any one of claims 1 to 5 wherein the inner layer tube is an LDPE resin or an LLDPE resin.

9. The PE tube of any one of claims 1-5, wherein the outer layer tube is a different color than the inner layer tube.

10. A water purification system comprising the PE pipe of any one of claims 1 to 9, and further comprising a water purification unit, the PE pipe being connected to the water purification unit and the PE pipe being adapted to supply water to the water purification unit.

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