Environment-friendly recyclable PVC (polyvinyl chloride) pipe

Abstract

The environment-friendly recyclable PVC pipe comprises a flow guide assembly and a self-sealing sleeve, the flow guide assembly comprises a flow guide part and a wall breaking part, the wall breaking part comprises a main body and a rotating handle, the main body can reciprocate in the radial direction of the PVC pipe, the rotating handle is kept parallel to the PVC pipe and detachably connected with the main body, and the flow guide part comprises a flow drainage part and a flow guide part; the flow guide part is fixedly connected with the wall breaking part through the main body, the height of the position, connected with the main body, of the flow guide part is smaller than that of the rotating handle in the outward direction of the axis of the PVC pipe, and the inner diameter of the end, leading out residual liquid in the PVC pipe, of the flow guide part is smaller than that of the other end of the flow guide part in the axial direction of the PVC pipe; the height of the drainage part is greater than the distance from the inner diameter surface of the flow guide part to the inner diameter surface of the outer layer; the self-sealing sleeve comprises an outer layer, a middle layer and an inner layer, the middle layer material can be swelled when encountering liquid in the PVC pipe, the pipe opening of the PVC pipe is blocked, and therefore the PVC pipe can be installed and detached in the working state.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of PVC pipe, in particular to an environment-friendly and recyclable PVC pipe. BACKGROUND

[0002] Polyvinyl chloride (PVC) pipe has become an indispensable basic component in modern construction, municipal engineering, agricultural irrigation and industrial fluid conveying fields due to its light weight, high strength, corrosion resistance, low cost and convenient installation. In the existing PVC pipe system, the connection methods are mainly divided into two categories: one is to use solvent adhesive for bonding, that is, glue connection; the other is to use rubber sealing ring for socket connection, or to use flange, thread and other mechanical methods for connection. Among them, solvent adhesive bonding is most widely used in pressure pipe and non-pressure pipe systems of water supply and drainage due to its simple operation and extremely low cost. This connection method dissolves the surface of the pipe and pipe fittings by solvent, so that they are fused at the molecular level, and after cooling, a rigid connection is formed, thereby ensuring the sealing and structural strength of the pipe system.

[0003] However, the above-mentioned existing connection method has a common defect, that is, once the pipe system is installed and put into operation, it cannot be installed, disassembled, repaired or modified in any form under the working state with pressure. If a section of pipe needs to be replaced or a branch needs to be added, the entire system must be closed, the medium in the pipe must be emptied, and then the old pipeline must be removed by destructive methods such as cutting, and then the work must be done again. This process is not only tedious, time-consuming and labor-intensive, but more seriously, for industrial production lines, high-rise building fire protection systems, data center cooling water circulation or critical municipal water supply networks that need to be continuously operated, any unplanned shutdown will result in huge economic losses, and even cause serious safety accidents.

[0004] In summary, the existing technology not only has the pain point of being unable to operate online in terms of functionality, but also contradicts the current green and circular economy development concept in terms of environmental protection due to its difficulty in disassembly and low recycling efficiency. The market urgently needs a new type of PVC pipe connection technology that can realize fast installation and disassembly under pressure and has high recyclability and environmental protection characteristics to solve the above-mentioned long-standing industry problems. SUMMARY

[0005] The technical problem to be solved by the present application is to overcome the defect that the PVC pipe in the prior art cannot complete installation, disassembly and repair in the working state, thereby providing an environment-friendly and recyclable PVC pipe.

[0006] To achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0007] An environment-friendly and recyclable PVC pipe comprises:

[0008] The flow guiding assembly includes a flow guiding component and a wall-breaking component fixedly connected to the flow guiding component;

[0009] The wall-breaking component includes a main body and a rotating handle. The main body can reciprocate along the radial direction of the PVC pipe. The reciprocating stroke of the main body is greater than the difference between the inner diameter of the outer layer and the outer diameter of the inner layer. The rotating handle is parallel to the PVC pipe and is detachably connected to the main body.

[0010] The flow guide includes a drain section and a flow guide section. The flow guide section is fixedly connected to the wall-breaking component through the main body. In the direction outward along the axis of the PVC pipe, the height of the position where the flow guide section is connected to the main body is less than the height of the rotating handle. In the axial direction of the PVC pipe, the inner diameter of the end of the flow guide that discharges residual liquid from the PVC pipe is less than the inner diameter of the other end of the flow guide. The drain section is fixedly disposed on the inner diameter surface of the flow guide section. In the radial direction of the PVC pipe, the height of the drain section is greater than the distance from the inner diameter surface of the flow guide section to the inner diameter surface of the outer layer.

[0011] The self-sealing sleeve includes an outer layer, a middle layer, and an inner layer. The self-sealing sleeve and the wall-breaking component are movably connected. The inner diameter surface of the outer layer abuts against the outer diameter surface of the middle layer, and the inner diameter surface of the middle layer abuts against the outer diameter surface of the inner layer. Along the axial direction of the PVC pipe, the length of the outer layer is greater than the length of the middle layer and equal to the length of the inner layer.

[0012] Preferably, the outer layer material is carbon fiber nylon, the middle layer material is preferably thermoplastic elastomer or thermoplastic rubber, and the inner layer material is preferably thermoplastic vulcanizate. The liquids that can be placed in the environmentally friendly and recyclable PVC pipe are limited to water and aqueous solutions, mineral oil, low-concentration acids and alkalis, alcohols and diesel.

[0013] Preferably, the flow guiding assembly further includes a relatively stationary component, which is fixedly connected to the flow guiding component, and the self-sealing sleeve and the flow guiding assembly are detachably connected through the relatively stationary component.

[0014] Preferably, the outer layer further includes a groove, the intermediate layer is disposed in the groove, and the inner diameter surface of the groove abuts against the outer diameter surface of the inner layer.

[0015] Preferably, the outer layer has an opening at the end near the liquid outlet of the guide section, with a sealing ring embedded in the opening, and the outer diameter of the discharge section is equal to the inner diameter of the sealing ring.

[0016] Preferably, the body further includes a threaded portion, which is disposed at the end of the body away from the rotating handle;

[0017] The outer layer is provided with a hole, and the hole wall is provided with an internal thread;

[0018] The threaded portion and the internal thread can achieve a threaded pair fit.

[0019] An environmentally friendly and recyclable PVC pipe usage method includes the following steps:

[0020] S1, the relatively stationary part is placed on the main body, and after moving it downward in the vertical direction to the preset position, the rotating handle is inserted into the main body so that the rotating handle and the main body are securely assembled.

[0021] S2, reduce the pressure inside the PVC pipe to the minimum. After the pressure inside the PVC pipe stabilizes, rotate the rotating handle to move it closer to the axis of the PVC pipe until the main body punctures the inner layer. Then rotate the flow guiding component and the self-sealing sleeve together to the lower vertical direction, so that the liquid remaining in the PVC pipe flows into the damaged part of the inner layer. When the liquid remaining in the PVC pipe flows through the middle layer, it comes into contact with the material of the middle layer and swells. The swollen product will block the end of the PVC pipe that needs to be operated.

[0022] S3, rotate the handle to move away from the axis of the PVC pipe, causing the main body to move upward in the vertical direction, which in turn drives the drain part to move upward in the vertical direction until the drain part punctures the sealing ring;

[0023] S4. Move the main body downwards in the vertical direction. At this time, the residual liquid in the PVC pipe will automatically flow out along the direction of the guide section due to gravity.

[0024] Preferably, the method further includes step S5, in which a dedicated container is provided below the vertical direction of the guide section, and the residual liquid is collected by the dedicated container after flowing out along the direction of the guide section.

[0025] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0026] The environmentally friendly recyclable PVC pipe provided in the above technical solution uses a flow guiding component as its core part, including a wall-breaking component and a flow guiding component. This effectively removes residual liquid from the pipe, reducing resource waste and environmental pollution. The main body of the wall-breaking component can move radially back and forth along the PVC pipe for precise operation; the rotating handle is detachably connected to the main body, simplifying installation and maintenance and improving ease of use. The flow guiding component includes a drain section and a flow guiding section. The drain section is fixed to the inner diameter surface of the flow guiding section, and its height design ensures that the main body moves upward while draining; the inner diameter of the flow guiding section gradually increases from one end to the other, optimizing the liquid flow path, improving flow guiding efficiency, and preventing residual liquid accumulation. The self-sealing sleeve includes an outer layer, a middle layer, and an inner layer, which are tightly connected to form a stable structure: the outer layer provides mechanical strength; the middle layer automatically blocks the pipe opening after swelling upon contact with liquid, enabling safe installation and disassembly during operation; the inner layer can be punctured by the main body and has stable material properties, facilitating liquid drainage. The length of the outer layer is greater than the length of the middle layer and equal to the length of the inner layer, enhancing overall sealing and durability. Attached Figure Description

[0027] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0028] Figure 1 This is a front view of the assembly of the environmentally friendly recyclable PVC pipe provided by the present invention.

[0029] Figure 2 Left view of the overall assembly of the environmentally friendly and recyclable PVC pipe provided by this invention;

[0030] Figure 3 This is a schematic diagram of the structure of the cell-wall breaking component provided by the present invention;

[0031] Figure 4 This is a schematic diagram of the structure of the flow guide provided by the present invention;

[0032] Figure 5 A cross-sectional view of the self-sealing sleeve provided by the present invention;

[0033] Figure 6 This is a schematic diagram of the outer layer structure provided by the present invention;

[0034] Figure 7 This is a rear view of the assembled environmentally friendly and recyclable PVC pipe provided by the present invention.

[0035] Explanation of reference numerals in the attached figures:

[0036] 1. Flow guiding component; 11. Wall breaking component; 111. Main body; 1111. Threaded part; 112. Rotating handle; 12. Flow guiding component; 121. Drainage part; 122. Flow guiding part; 13. Relative stationary component; 2. Self-sealing sleeve; 21. Outer layer; 211. Groove; 212. Opening; 2121. Sealing ring; 213. Hole; 2131. Internal thread; 22. Intermediate layer; 23. Inner layer. Detailed Implementation

[0037] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0039] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0040] Please see Figures 1 to 7 This embodiment provides an environmentally friendly and recyclable PVC pipe, aiming to solve the problems of existing PVC pipe systems being unable to be installed, disassembled, and repaired under pressure, and being difficult to recycle. This invention cleverly draws on the design concept of the "self-sealing oil tank" from the United States during World War II. Through a unique structural design, it achieves safe and rapid emptying of residual liquid and operation during pipeline operation, while ensuring a high degree of environmental recyclability.

[0041] The core structure of this invention mainly includes two parts: a flow guiding component 1 and a self-sealing sleeve 2.

[0042] First, the flow guiding component 1 will be described in detail. The flow guiding component 1 is the key actuator for realizing cell wall breaking, flow guiding and operation control. Its ingenious design and the coordinated action of its components ensure the accuracy and reliability of the entire process.

[0043] The flow guiding component 1 includes a cell-breaking component 11, a flow guiding component 12, and a relatively stationary component 13.

[0044] The wall-breaking component 11 is the core component for performing the physical puncture action, consisting of a main body 111 and a rotating handle 112. The main body 111 is designed as a rod-shaped structure that can reciprocate radially along the PVC pipe. Its reciprocating stroke is precisely calculated to be greater than the difference between the inner diameter of the outer layer 21 and the outer diameter of the inner layer 23 in the self-sealing sleeve 2. The technical effect of this design is to ensure that the main body 111 has sufficient movement distance to completely penetrate the inner layer 23, forming an effective liquid channel, avoiding puncture failure or channel obstruction due to insufficient stroke, and also ensuring that the drain part 121 can completely penetrate the sealing ring 2121. The end of the main body 111 is also provided with a threaded part 1111, which is used to form a threaded pair with the internal thread 2131 on the self-sealing sleeve 2, converting the rotational motion into precise linear displacement, thereby achieving precise control of the puncture depth.

[0045] The rotating handle 112 is detachably connected to the main body 111, and after installation, it remains parallel to the axis of the PVC pipe. This parallel layout provides the operator with an ergonomic operating interface, making rotational force application smoother and less strenuous, while avoiding additional torque caused by improper lever arm during operation, thus protecting the stability of the connection structure. The detachable design facilitates the manufacture, transportation, maintenance, and replacement of the equipment.

[0046] The flow guide 12 is a channel responsible for guiding the orderly outflow of residual liquid, and it includes a drain section 121 and a flow guide 122. The flow guide 122 is detachably fixedly connected to the wall-breaking component 11 via the main body 111. This connection method ensures that the flow guide 12 can stably drive the wall-breaking component 11 to move synchronously when the wall-breaking component 11 moves radially. Along the outward direction of the PVC pipe axis, the height at which the flow guide 122 connects to the main body 111 is designed to be less than the height of the rotating handle 112. The technical effect of this height difference is that it provides sufficient space for the operation of the rotating handle 112, avoids interference between the rotating handle 112 and the flow guide 12 or other components during operation, and improves the convenience and safety of operation.

[0047] Viewed axially along the PVC pipe, the inner diameter of the end of the guide member 12 used to discharge residual liquid is smaller than the inner diameter of the other end, forming a gradually expanding flow channel inside the guide section 122. The technical effect of this gradually expanding flow channel design is that when liquid flows from the smaller inner diameter end to the larger inner diameter end, the flow velocity gradually decreases, and the pressure drops accordingly, creating a Venturi-like effect. This not only helps the liquid flow out smoothly but also effectively prevents splashing or eddies caused by excessive liquid flow velocity, ensuring a stable and controllable liquid collection process. The drain section 121 is fixedly installed on the inner diameter surface of the guide section 122, and its function is to act as a "key" to open the final drainage channel. Along the radial direction of the PVC pipe, the height of the drain section 121 is designed to be greater than the distance from the inner diameter surface of the guide section 122 to the inner diameter surface of the outer layer 21 in the self-sealing sleeve 2. The technical effect of this dimensional relationship is crucial. It ensures that when the wall-breaking component 11 drives the flow guide 12 to move upward, the discharge part 121 has enough stroke to reach and successfully puncture the sealing ring 2121 set on the outer layer 21, thereby opening a precise and controllable outlet for the final discharge of residual liquid.

[0048] The relatively stationary component 13 is a key component in this invention for achieving decoupling of complex motions. In this embodiment, it is preferably a ball bearing. The relatively stationary component 13 is fixedly connected to the self-sealing sleeve 2 and also fixedly connected to the flow guide 12. Its core technical effect lies in achieving the separation and transmission of motion. Specifically, when the operator rotates the rotating handle 112 to drive the wall-breaking component 11 to rotate downwards or upwards, due to the presence of the relatively stationary component 13, this rotational motion is not transmitted to the flow guide 12, which is fixedly connected to it. The flow guide 12 is only driven by the wall-breaking component 11 to move purely vertically upwards or downwards. The advantage of this design is that during the wall-breaking stage, it ensures that when the wall-breaking component 11 rotates downwards to break the inner layer 23, the flow guide 12 is only driven downwards, avoiding unnecessary friction or jamming between the flow guide 12 and the self-sealing sleeve 2 that may occur due to the rotation of the flow guide 12, thus ensuring the precise execution of the wall-breaking action. During the preparation for drainage, when it is necessary to move the wall-breaking component 11 upward to drive the draining part 121 to puncture the sealing ring 2121, only the vertical upward displacement is transmitted, ensuring that the draining part 121 can act vertically and accurately on the center position of the sealing ring 2121, thereby improving the success rate of puncture and sealing performance.

[0049] Next, the self-sealing sleeve 2 will be described in detail. The self-sealing sleeve 2 is the core of this invention to achieve online operation and environmentally friendly self-sealing. The design inspiration of the self-sealing sleeve 2 comes from the self-sealing fuel tank. Through the ingenious combination of materials and structure, it realizes the self-repair and sealing function after being punctured.

[0050] The self-sealing sleeve 2 comprises an outer layer 21, a middle layer 22, and an inner layer 23. These three layers are tightly joined radially from the outside in, forming a composite pipe wall structure. Along the axial direction of the PVC pipe, the length of the outer layer 21 is greater than the length of the middle layer 22, and the length of the middle layer 22 is equal to the length of the inner layer 23. The technical advantage of this stepped length design is that the outer layer 21, as the main load-bearing and connecting structure, requires a longer length to ensure the connection strength and stability with the PVC pipe or other components; the middle layer 22 and the inner layer 23 are of equal and relatively short length, allowing them to be positioned within a specific area inside the outer layer 21, forming a centralized functional module. This saves on expensive functional materials and ensures that the self-sealing function occurs at a predetermined location, facilitating precise control.

[0051] The outer layer 21 forms the skeleton of the entire self-sealing sleeve 2, and its material is preferably carbon fiber nylon. This material has the advantages of high strength, high modulus, corrosion resistance, and lightweight. Its technical effect is to provide robust protection and support for the internal structure, withstand the pressure inside the pipe and external mechanical stress, and ensure the structural integrity and long-term reliability of the entire device. The outer layer 21 also integrates several key features. First, it is provided with a groove 211, in which the intermediate layer 22 is precisely positioned, and the inner diameter surface of the groove 211 abuts against the outer diameter surface of the inner layer 23. The technical effect of this design is to effectively limit the radial and axial movement of the intermediate layer 22, preventing it from shifting or deforming during liquid impact or swelling, and ensuring the stable triggering of the self-sealing function. Second, the outer layer 21 is provided with a hole 213, the wall of which is machined with an internal thread 2131 for mating with the threaded portion 1111 of the wall-breaking component 11, forming a precision threaded transmission pair that drives the movement of the entire system. Thirdly, at the end near the liquid outlet of the guide section 122, an opening 212 is provided vertically downwards, and a sealing ring 2121 is embedded in the opening 212. The outer diameter of the drain section 121 is equal to the inner diameter of the sealing ring 2121. The sealing ring 2121 is usually made of an elastic material with a certain strength and toughness. Its technical effect is that, in the non-drainage state, it can reliably seal the opening 212 to prevent liquid leakage in the pipeline; while when drainage is required, it can be cleanly and neatly punctured by the drain section 121 to form a regular drainage port.

[0052] The intermediate layer 22 is the core component for achieving the self-sealing function, and its material is preferably thermoplastic elastomer (TPE) or thermoplastic rubber (TPR). The unique chemical properties of these materials are key to this invention. The technical effect is that when residual liquid inside the PVC pipe comes into contact with the material of the intermediate layer 22, the material rapidly swells. The swollen material significantly increases in volume, tightly filling the opening formed by the puncture of the inner layer 23 by the main body 111, as well as any tiny gaps between the self-sealing sleeve 2 and the end face of the PVC pipe. This self-sealing mechanism, driven by material properties, allows the PVC pipe to be installed and disassembled even under pressure. Once the operation is complete, the swollen intermediate layer 22 immediately forms a reliable sealing barrier, preventing liquid leakage and thus achieving revolutionary online operation capabilities.

[0053] The inner layer 23 is the first barrier that directly contacts the liquid inside the pipe and withstands puncture. Its material is preferably thermoplastic vulcanizate (TPV). This material combines the elasticity of rubber with the processability of plastic. Its technical advantages are twofold: firstly, it has good chemical stability and media resistance, resisting the erosion of various liquids such as water, mineral oil, low-concentration acids and alkalis, alcohols, and diesel, ensuring sealing performance under normal operating conditions; secondly, it has appropriate toughness and strength, allowing the main body 111 to be punctured in a controllable manner. The puncture process does not generate a large amount of debris, avoiding debris blockage of the flow channel or contamination of the liquid, thus creating conditions for smooth subsequent flow and effective triggering of the self-sealing mechanism.

[0054] The use of the environmentally friendly and recyclable PVC pipe of this invention fully demonstrates the technical effect of the coordinated work of the above-mentioned components:

[0055] First, in step S1, the operator places the relatively stationary component 13, which serves as a ball bearing, onto the main body 111, and then moves the entire flow guiding assembly 1 downwards along the outer layer 21 of the self-sealing sleeve 2 to a preset position. At this point, the rotating handle 112 is inserted into the main body 111, completing the assembly. At this point, the flow guiding assembly 1 and the self-sealing sleeve 2 form a detachable and stable connection through the relatively stationary component 13.

[0056] Next, in step S2, after the pressure inside the PVC pipe to be operated is reduced to a minimum and stabilized, the operator begins to rotate the rotating handle 112. The rotational force of the rotating handle 112 is converted into a precise linear movement of the body 111 of the wall-breaking component 11 along the axis of the PVC pipe through the threaded pair of the threaded part 1111 and the internal thread 2131. During this process, due to the ball bearing action relative to the stationary part 13, the guide component 12 only follows the body 111 in a smooth vertical downward movement without rotation. When the body 111 reaches the predetermined stroke, its tip successfully punctures the inner layer 23. Subsequently, the operator rotates the guide component 1 and the self-sealing sleeve 2 as a whole by 180 degrees, so that the punctured notch is located vertically downward. The liquid remaining in the PVC pipe flows into the damaged area of ​​the inner layer 23 under the action of gravity and quickly comes into contact with the intermediate layer 22. The material of the intermediate layer 22 immediately swells and expands in volume, completely blocking the pipe ends and damaged areas of the PVC pipe, achieving a safe seal in the working state and creating leak-free conditions for subsequent disassembly or installation operations.

[0057] Then, in step S3, when it is necessary to drain the residual liquid, the operator rotates the rotating handle 112 in the opposite direction. The main body 111 of the wall-breaking component 11 moves away from the axis of the PVC pipe, causing the guide component 12 connected to it to move vertically upward. When it moves to a specific position, the drain part 121 fixed on the guide component 12 will precisely puncture the sealing ring 2121 at the opening 212 of the outer layer 21.

[0058] Finally, in step S4, the operator rotates the handle 112 clockwise again, causing the main body 111 to move radially inward, pulling the drain section 121 out of the punctured sealing ring 2121. At this point, a permanent drainage channel is formed on the sealing ring 2121. Under the influence of gravity, the residual liquid in the PVC pipe will pass through the rupture in the inner layer 23 and the swollen intermediate layer 22, eventually flowing out from the damaged part of the sealing ring 2121. It will then flow smoothly along the gradually expanding inner wall of the guide section 122 in the guide member 12 into the dedicated container placed below, completing the safe and environmentally friendly collection of the residual liquid.

[0059] In summary, the specific embodiments of the present invention, through the precise cooperation between the flow guiding component 1 and the self-sealing sleeve 2, especially the swelling design of the intermediate layer 22 which draws on the concept of a self-sealing oil tank, and the motion decoupling achieved by the relatively stationary component 13, successfully solve the technical problems of the inability to operate PVC pipeline systems online and the difficulty of recycling, and realize safe, efficient and environmentally friendly pipeline maintenance and recycling.

[0060] The above embodiments are merely preferred embodiments of the present invention and should not be construed as limiting the scope of protection of the present invention. Any non-substantial changes and substitutions made by those skilled in the art based on the present invention shall fall within the scope of protection claimed by the present invention.

Claims

1. An environmentally friendly and recyclable PVC pipe, characterized in that, include: The flow guiding component (1) includes a cell wall breaking component (11) and a flow guiding component (12). The self-sealing sleeve (2) includes an outer layer (21), a middle layer (22) and an inner layer (23). The self-sealing sleeve (2) and the wall-breaking component (11) are movably connected. The inner diameter surface of the outer layer (21) abuts against the outer diameter surface of the middle layer (22), and the inner diameter surface of the middle layer (22) abuts against the outer diameter surface of the inner layer (23). Along the axial direction of the PVC pipe, the length of the outer layer (21) is greater than the length of the middle layer (22) and equal to the length of the inner layer (23). The wall-breaking component (11) includes a main body (111) and a rotating handle (112). The main body (111) can reciprocate along the radial direction of the PVC pipe. The reciprocating stroke of the main body (111) is greater than the difference between the inner diameter of the outer layer (21) and the outer diameter of the inner layer (23). The rotating handle (112) is parallel to the PVC pipe and is detachably connected to the main body (111). The guide member (12) includes a drain section (121) and a guide section (122). The guide section (122) is detachably connected to the wall-breaking member (11) through the main body (111). In the direction outward along the axis of the PVC pipe, the height of the position where the guide section (122) is connected to the main body (111) is less than the height of the rotating handle (112). In the axial direction of the PVC pipe, the inner diameter of the end of the guide member (12) that discharges the residual liquid in the PVC pipe is less than the inner diameter of the other end of the guide member (12). The drain section (121) is fixedly disposed on the inner diameter surface of the guide section (122). In the radial direction of the PVC pipe, the height of the drain section (121) is greater than the distance from the inner diameter surface of the guide section (122) to the inner diameter surface of the outer layer (21).

2. The environmentally friendly recyclable PVC pipe according to claim 1, characterized in that, The outer layer (21) is preferably made of carbon fiber nylon, the middle layer (22) is preferably made of thermoplastic elastomer or thermoplastic rubber, and the inner layer (23) is preferably made of thermoplastic vulcanizate. The liquids that can be placed in the environmentally friendly and recyclable PVC pipe are limited to water and aqueous solutions, mineral oil, low-concentration acids and alkalis, alcohols and diesel.

3. The environmentally friendly recyclable PVC pipe according to claim 1, characterized in that, The flow guiding component (1) also includes a relatively stationary component (13), which is fixedly connected to the self-sealing sleeve (2). The self-sealing sleeve (2) and the flow guiding component (1) are detachably connected through the relatively stationary component (13).

4. The environmentally friendly recyclable PVC pipe according to claim 1, characterized in that, The outer layer (21) further includes a groove (211), and the intermediate layer (22) is disposed in the groove (211), wherein the inner diameter surface of the groove (211) abuts against the outer diameter surface of the inner layer (23).

5. The environmentally friendly recyclable PVC pipe according to claim 1, characterized in that, The outer layer (21) has an opening (212) located at the end of the liquid flow of the guide part (122) and is provided with an opening (212) in the vertical direction below. A sealing ring (2121) is embedded in the opening (212), and the outer diameter of the drain part (121) is equal to the inner diameter of the sealing ring (2121).

6. The environmentally friendly recyclable PVC pipe according to claim 1, characterized in that, The main body (111) also includes a threaded portion (1111), which is disposed at one end of the main body (111) away from the rotating handle (112); The outer layer (21) is provided with a hole (213) in the vertical direction. The hole (213) is located below the relatively stationary member (13) and spaced apart from the relatively stationary member (13). The hole wall of the hole (213) is provided with an internal thread (2131). The threaded portion (1111) and the internal thread (2131) can be fitted together.

7. A method for using environmentally friendly and recyclable PVC pipes, characterized in that, The method of using the environmentally friendly recyclable PVC pipe according to any one of claims 1-6 includes the following steps: S1, the relatively stationary part (13) is fitted onto the main body (111), and after moving downward in the vertical direction to the preset position, the rotating handle (112) is inserted into the main body (111) so that the rotating handle (112) and the main body (111) are securely assembled. S2, reduce the pressure inside the PVC pipe to the minimum. After the pressure inside the PVC pipe stabilizes, rotate the rotating handle (112) to move it closer to the axis of the PVC pipe until the main body (111) punctures the inner layer (23). Then rotate the flow guide assembly (1) and the self-sealing sleeve (2) together to the lower vertical direction, so that the liquid remaining in the PVC pipe flows into the damaged part of the inner layer (23). When the liquid remaining in the PVC pipe flows through the intermediate layer (22), it comes into contact with the material of the intermediate layer (22) and swells. The swollen product will block the end of the PVC pipe that needs to be operated. S3, rotate the rotating handle (112) to move away from the axis of the PVC pipe, causing the main body (111) to move upward in the vertical direction, driving the drain part (121) to move upward in the vertical direction until the drain part (121) punctures the sealing ring (2121). S4, in the vertical direction, the main body (111) is moved downwards. At this time, the residual liquid in the PVC pipe will be affected by gravity and automatically flow out in the direction of the guide part (122).

8. The method for using environmentally friendly recyclable PVC pipes according to claim 7, characterized in that, It also includes step S5, in which dedicated containers are provided at intervals below the vertical direction of the guide section (122), and the residual liquid is collected by the dedicated containers after flowing out along the direction of the guide section (122).

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