A PERT multi-layer pipeline and a multi-layer pipeline production device

Abstract

The present invention discloses a PERT multilayer pipe and a multilayer pipe production device, wherein the multilayer pipe comprises a main body layer, an adhesive layer, an outer layer and an inner layer, wherein the outer layer is located on the outer side of the main body layer, the adhesive layer is located between the main body layer and the outer layer, and is used to bond the main body layer to the outer layer, and the inner layer is located on the inner side of the main body layer, and the main body layer, the adhesive layer, the outer layer and the inner layer are an integrated structure. The present invention adopts a multilayer composite structure, wherein the outer layer uses an oxygen-barrier material to completely isolate the fluid inside the pipe from oxygen; the PERT modified by adding an antiscalant and an antibacterial agent to the inner layer prevents the inner wall of the pipe from scaling and the generation of bacteria, thereby preventing the composite pipe from scaling and antibacterial; the integrated pipe is produced by adopting a multilayer mold technology, and can be widely used in indoor floor heating, whole-house water circulation water supply system, home improvement, engineering decoration, assembled buildings and other water system projects.

Description

Technical Field

[0001] The present invention relates to the technical field of pipes, and more specifically, to a multi-layer pipe production device and a PERT multi-layer pipe. Background Art

[0002] PERT pipe is a non-cross-linked polyethylene pipe, based on its special molecular design and synthesis process, as well as excellent physical and chemical properties. This structure makes the material have better mechanical properties, improves the resistance to external stress, and also gives the material good thermal stability and crack resistance.

[0003] This type of pipe adopts special molecular design and synthesis process, and forms a unique molecular structure by controlling the number and distribution of side chains, thereby improving heat resistance. The maximum heat resistance temperature of PERT pipe is 60℃, which makes it suitable for hot water systems, including floor heating systems and hot and cold water supply pipes.

[0004] Single-layer pipes, due to the simplicity of their internal structure, use the same material for their inner and outer layers. However, in actual use, the environments that their inner and outer layers are exposed to are usually different. The outer layer is usually in direct contact with the outside air, and its surface is easily oxidized, which in turn causes aging of the pipe surface and affects the service life of the pipe. The inner layer of the pipe is in contact with the fluid and other substances in the pipe, and is easily affected by scale hanging on the wall, which in turn causes scaling and bacteria in the pipe, and is not conducive to pollution inside the pipe, affecting the normal use of the pipe.

[0005] In the production process of this type of multi-layer composite pipe, it is usually necessary to adopt a multi-layer co-extrusion method to form a multi-layer composite structure. During the composite co-extrusion process of the multi-layer materials of the pipe, the raw materials of the inner layer of the pipe will be distributed in the inner layer of the pipe, thereby forming a composite pipe structure. However, during the co-extrusion process, the input raw materials may be unevenly distributed in the circumferential direction, affecting the overall performance and quality stability of the pipe.

[0006] Therefore, a new solution needs to be proposed to solve this problem. Summary of the invention

[0007] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a PERT multi-layer pipe which adopts a multi-layer composite structure and can protect the inner layer and the outer layer of the pipe.

[0008] In order to achieve the above object, the present invention adopts the following technical solution:

[0009] A PERT multi-layer pipe, characterized in that it comprises a main body layer, an adhesive layer, an outer layer and an inner layer, wherein the outer layer is located on the outside of the main body layer, the adhesive layer is located between the main body layer and the outer layer and is used to bond the main body layer to the outer layer, the inner layer is located on the inner side of the main body layer, and the main body layer, the adhesive layer, the outer layer and the inner layer are an integrated structure.

[0010] The present invention is further configured such that the main layer is PERT, the outer layer is EVOH, and the inner layer is an anti-fouling and antibacterial layer.

[0011] The present invention is further configured such that the thickness of the outer layer is 0.03-0.07 mm, the thickness of the adhesive layer is 0.05-0.09 mm, and the thickness of the inner layer is 0.08-0.15 mm.

[0012] The present invention also provides a multi-layer pipeline production device, including a die head and a die core, wherein the die head is provided with a center hole with two ends passing through, the die core is arranged in the center hole, the center hole has an input end and an output end, and an annular channel one is formed between the die head and the die core; the die core comprises an inner ring body and a center column two, the inner ring body is provided with an inner hole, which is closed on the side facing the input end and opened on the side facing the output end, the center column two parts extend into the inner hole of the inner ring body, and the center column two parts extend out from the open opening of the inner hole, and an annular channel two is formed between the inner ring body and the center column two; the inner ring body is provided with a through hole one, the through hole one is connected to the inner hole, and also includes a material guide pipe one, the material guide pipe one is connected to the through hole one, and is used to transport raw materials to the inner hole, a rotating part is arranged in the inner hole, the rotating part is sleeved outside the center column two, and can rotate relative to the center column two.

[0013] The present invention is further configured such that the mold core also includes an outer ring body, which is sleeved on the outer periphery of the inner ring body, and a material transfer channel is formed between the outer ring body and the inner ring body, and the material transfer channel is connected to an annular channel; the outer ring body and the inner ring body are connected and fixed by a plurality of connecting parts, and the through hole is opened in the connecting part and extends to the outer periphery of the outer ring body.

[0014] The present invention is further configured such that the mold core also includes a fixed block and a center column 1, the side of the inner ring body facing the input end is closed by the fixed block, the center column 1 and the center column 2 are both coaxially fixedly connected to the fixed block, the center column 1 faces the side of the input end, and the center column 2 faces the side of the output end.

[0015] The present invention is further configured such that a fixed end is formed at one end of the center column 2, the fixed end is fixedly connected to the fixed block, a connecting hole is provided inside the rotating member, the connecting hole is rotatably connected to the fixed end of the center column 2, and a plurality of fins are fixedly connected to the outer periphery of the rotating member, and the fins are evenly distributed in a ring shape.

[0016] The present invention is further configured such that the fin includes a first end and a second end, the first end extends toward the input end, the second end extends toward the output end, and the first end is located at the position of the through hole 1;

[0017] The present invention is further configured such that the fixed end has a stepped structure, forming a stepped surface facing a fixed block; an annular groove is formed between the stepped surface and the fixed block; and the rotating member is located in the annular groove.

[0018] The present invention is further configured such that the first through hole is arranged along a tangent direction of the second annular channel.

[0019] The present invention is further configured as follows: the inner ring body is provided with a second through hole, one end of the second through hole is connected to the inner hole, and the other end extends outward along the connecting portion and forms an opening on the outer periphery of the outer ring body; a second material guide tube is fixedly connected to the outer periphery of the die head, and the second material guide tube is connected to the second through hole opening on the outer periphery of the outer ring body; the second material guide tube is used for outputting the raw material in the inner hole; the first through hole and the second through hole are both arranged along the tangent direction of the second annular channel, and the first through hole and the second through hole are coaxial.

[0020] The present invention is further configured to further include a screw extruder 1 and a screw extruder 2, wherein the screw extruder 1 includes a discharge end 1 and a feed end 1, and the discharge end 1 is connected to a material guide pipe 1 and can transport materials to the material guide pipe 1;

[0021] The present invention is further configured such that the second screw extruder comprises a second discharge end and a second feed end, the second feed end is connected to a second material guide pipe and can supply material output from the second material guide pipe, the second discharge end is connected to a first material guide pipe and can transport material to the first material guide pipe; the first discharge end and the second discharge end are both provided with a one-way mechanism, and the one-way mechanism is used to guide material unidirectionally toward the first material guide pipe.

[0022] In summary, the present invention has the following beneficial effects:

[0023] The pipeline in this scheme adopts a multi-layer composite structure, the outer layer of which can form protection on the outside of the pipeline. The outer layer has good oxygen barrier properties and can completely isolate the fluid inside the pipe from oxygen; the middle adhesive layer can bond the main layer and the outer layer so that each layer of material can maintain good strength performance and stability.

[0024] The inner layer is lined on the innermost side of the pipe and can protect the inner side of the pipe. After the anti-scaling agent and antibacterial agent are added to the PERT of the inner layer for modification, it can prevent scaling and bacteria from forming on the inner wall of the pipe for the fluid that the inner layer directly contacts, so that the composite pipe has anti-scaling and antibacterial effects.

[0025] By adopting the multi-layer pipe production device, the composite pipe can be co-extruded, and by arranging a core and a rotating part in the die head, the co-extrusion of two layers of materials can be achieved, and through the rotating action of the rotating part, the material in the annular channel two can be rotated evenly. During the extrusion process, the thickness distribution of each layer of the pipe will be more uniform, the concentricity of each layer of material will be higher, and the overall stability and strength performance of the pipe will be better. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A schematic diagram of the structure of a PERT multi-layer pipeline in an embodiment;

[0027] Figure 2 The cross-sectional view of the die head and the die core in the first embodiment Figure 1 ;

[0028] Figure 3 It is a structural schematic diagram of the mold core in Example 1;

[0029] Figure 4 The cross-sectional view of the die head and the die core in the second embodiment Figure 2 ;

[0030] Figure 5 The cross-sectional view of the die head and the die core in the second embodiment Figure 1 ;

[0031] Figure 6 The cross-sectional view of the die head and the die core in the second embodiment Figure 2 ;

[0032] Figure 7 It is a schematic diagram of the structure of the die head and the first and second screw extruders in Example 2.

[0033] Figure numerals: main body layer 101; adhesive layer 102; outer layer 103; inner layer 104; die head 1; center hole 11; input end 111; output end 112; necking portion 12; annular channel 13; core 2; inner ring body 21; center column 1 22; fixing block 23; center column 24; fixing end 241; stepped surface 242; inner hole 25; annular channel 251; tapered portion 26; outer ring body 27; feed passage 28; connecting portion 29; through hole 1 210; through hole 211; guide pipe 1 3; rotating member 4; connecting hole 41; fin 42; first end 421; second end 422; guide pipe 2 5; screw extruder 1 6; discharge end 1 61; feed end 1 62; screw extruder 2 7; discharge end 2 71; feed end 2 72; one-way mechanism 8. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] Embodiment 1

[0036] This embodiment discloses a multi-layer pipeline production device, referring to Figure 1 As shown, it includes a die head 1 and a die core 2. The die head 1 is provided with a center hole 11 with two ends passing through. The die core 2 is installed in the center hole 11. The die head 1 and the die core 2 are mutually sleeved and surrounded to form an annular channel 13.

[0037] The central hole 11 has an input end 111 and an output end 112. When the raw material is transported from the input end 111 to the output end 112, a ring structure will be formed in the ring channel 13. When in use, the multi-layer pipe production device is installed at the front end of the extrusion die, thereby realizing the extrusion of the ring pipe.

[0038] Reference Figure 2 , Figure 3 , Figure 4 As shown, the mold core 2 includes an inner ring body 21 and a center column 24. The inner ring body 21 is provided with an inner hole 25, which is closed on the side facing the input end 111 and opened on the side facing the output end 112. The mold core 2 also includes a fixing block 23 and a center column 1 22. The side of the inner ring body 21 facing the input end 111 is closed by the fixing block 23, and the center column 1 22 and the center column 2 24 are both coaxially fixedly connected to the fixing block 23. The center column 1 22 faces the side of the input end 111, and the center column 2 24 faces the side of the output end 112. The center column 1 22 and the center column 2 24 can form restrictions in the inner cavity of the mold respectively, so that the pipeline can be extruded on the outer periphery of the column.

[0039] The second center column 24 partially extends into the inner hole 25 of the inner ring body 21, and partially extends from the opening of the inner hole 25, forming an annular channel 251 between the inner ring body 21 and the second center column 24. The inner ring body 21 is provided with a through hole 1 210, and the through hole 1 210 is connected to the inner hole 25.

[0040] In addition, a material guide tube 3 is connected to the outside of the die head 1, and the material guide tube 3 is connected to the through hole 210, and can transport raw materials to the inner hole 25. One stream of raw materials flows along the annular channel 13; another stream of materials enters the inner hole 25 from the through hole 210, is guided by the central column 24, and enters the annular channel 2 251. The annular channel 13 and the annular channel 2 251 form a two-layer tubular structure respectively, and then a two-layer composite can be formed. If multiple layers of materials need to be composited with each other, multiple sets of die heads 1 can be connected in sequence, and then a multi-layer composite tubular structure can be formed.

[0041] Reference Figure 2 , Figure 3 , Figure 4 As shown, a rotating member 4 is arranged in the inner hole 25, and the rotating member 4 is sleeved outside the center column 24 and can rotate relative to the center column 24. The through hole 1 210 is arranged along the tangent direction of the annular channel 2 251. The raw material enters the inner hole 25 from the through hole 1 210, and will form an annular rotational motion around the inner circumference of the inner hole 25, thereby driving the rotating member 4 in the inner hole 25 to rotate, and the rotating member 4 will generate an axial rotational motion. During the axial rotational motion, the rotating member 4 will drive the raw material to rotate in the inner hole 25, and then can spirally move in the annular channel 2 251, so that the raw material distribution in the annular channel 2 251 can be more uniform, and the uniformity of the annular channel 2 251 in the circumferential direction can be maintained. In the subsequent extrusion process, the thickness of a layer output in the annular channel 2 251 will be more uniform, so that the thickness distribution of each layer of the pipeline in the subsequent extrusion process will be more uniform, the concentricity of each layer of material will be higher, and the overall stability and strength performance of the pipeline will be better.

[0042] Reference Figure 3 As shown, a fixed end 241 is formed at one end of the center column 24, and the fixed end 241 extends into the inner hole 25 and is fixedly connected to the fixed block 23. The rotating member 4 is an annular sleeve structure, and a connecting hole 41 is arranged inside. The connecting hole 41 is sleeved outside the fixed end 241 of the center column 24 to form a rotating connection structure. In addition, a rotating guide bearing is installed between the connecting hole 41 and the rotating member 4, so that the rotating member 4 can rotate smoothly.

[0043] A plurality of fins 42 are fixedly connected to the outer periphery of the rotating member 4, and each fin 42 is evenly distributed in a ring shape. The raw materials of each part of the circumferential position can be roughly separated by each fin 42, and the raw materials at each position can be kept in a relatively uniform state. In addition, the fins 42 on the outer periphery of the rotating member 4 can interact with the materials input into the inner hole 25 from the through hole 1 210. When the materials are input from the through hole 1 210, the fins 42 on the outer periphery of the rotating member 4 will be driven, so that the rotating member 4 and the fins 42 can generate a rotational motion. Moreover, after the rotating member 4 and the fins 42 rotate a certain angle, the materials can enter the space between the two fins 42. When the materials continue to be input, the rotating member 4 and the fins 42 will rotate, and the other two adjacent fins 42 will receive the raw materials, so that the raw materials at each position of the outer periphery of the rotating member 4 can be more evenly distributed.

[0044] Reference Figure 2 , Figure 3 As shown, the fin 42 includes a first end 421 and a second end 422, the first end 421 extends toward the input end 111; the second end 422 extends toward the output end 112, and the first end 421 is located at the position of the through hole 1 210. When the raw material is input from the through hole 1 210 into the inner hole 25, a part of the material will directly enter between the two fins 42, and the other part of the material will enter the space between the first end 421 of the fin 42 and the fixed block 23, and then in the process of further extrusion, it will be transported along the annular channel 251 and enter between the two fins 42, so that the raw material can be evenly distributed in the inner hole 25.

[0045] Furthermore, the fixed end 241 is in a stepped structure, forming a stepped surface 242 facing the fixed block 23, and the stepped surface 242 is in a cone-like structure, gradually shrinking toward the fixed block 23. An annular groove is formed between the stepped surface 242 and the fixed block 23, and the rotating member 4 is located in the annular groove. The stepped surface 242 and the fixed block 23 can limit the position of the rotating member 4, so that the rotating member 4 can only generate axial rotation.

[0046] Reference Figure 4 As shown, the mold core 2 also includes an outer ring body 27, which is sleeved on the outer circumference of the inner ring body 21, and the two are sleeved on each other, forming a material passage 28 between the outer ring body 27 and the inner ring body 21. The material passage 28 is connected with the annular channel 13, so that the material passage 28 can be connected to the annular channel 13, and the material can pass smoothly.

[0047] The outer ring body 27 and the inner ring body 21 are connected and fixed by a plurality of connecting parts 29, so that the outer ring body 27 and the inner ring body 21 can be fixed to each other, and the outer ring body 27, the inner ring body 21 and the plurality of connecting parts 29 are connected to form an integrated structure. The plurality of connecting parts 29 form a multi-point distributed connection structure, and a gap is formed between two adjacent connecting parts 29, so that the raw materials can pass smoothly.

[0048] The through hole 1 210 is provided in the connection part 29, one end of the through hole 1 210 penetrates the inner ring body 21 and extends to the inner periphery of the inner ring body 21, while the other end extends to the outer periphery of the outer ring body 27, forming an opening at the outer periphery of the outer ring body 27. The end of the material guide pipe 1 3 passes through the die head 1 and extends into the inner periphery of the die head 1, and the end of the material guide pipe 1 3 is connected to the opening of the outer ring body 27. The raw material input by the material pipe 1 3 will enter the annular channel 2 251, and a composite multi-layer pipeline structure can be formed.

[0049] Embodiment 2

[0050] This embodiment discloses a multi-layer pipeline production device. Based on the first embodiment, Figure 5 , Figure 6 , Figure 7 Provide detailed explanation.

[0051] The inner ring body 21 defines a second through hole 211 , one end of the second through hole 211 is connected to the inner hole 25 , and the other end of the through hole 211 extends outward along the connecting portion 29 to form an opening at the outer periphery of the outer ring body 27 .

[0052] A material guide tube 2 5 is fixedly connected to the outer periphery of the die head 1, and the material guide tube 2 5 is connected to the opening of the through hole 211 on the outer periphery of the outer ring body 27. The through hole 211 is also provided in the connecting portion 29. The structure of the through hole 211 is roughly similar to that of the through hole 1 210, forming a roughly symmetrically distributed structure.

[0053] Furthermore, the through hole 1 210 and the through hole 2 211 are both arranged along the tangent direction of the annular channel 2 251, and the through hole 1 210 and the through hole 2 211 are coaxial, and the through hole 1 210 and the through hole 2 211 are arranged along the same straight line direction. The material guide pipe 2 5 can be used to output the raw materials in the inner hole 25, so that part of the material in the inner hole 25 can be output from the material guide pipe 2 5, thereby enabling the material in the inner hole 25 to circulate. A part of the material input into the inner hole 25 can be input into the inner hole 25 from the through hole 1 210, and then enter the annular channel 2 251, while the excess part of the material can be output from the through hole 2 211, thereby enabling the raw materials input into the inner hole 25 to circulate, so that the material distribution in the inner hole 25 can be more uniform.

[0054] When the raw material is input into the inner hole 25, the raw material will flow along the through hole 1 210 and the through hole 2 211 in a straight line, so that the through hole 1 210, the inner hole 25 and the through hole 2 211 can realize a straight line flow, which can drive the rotating part 4 in the inner hole 25 to produce rotational motion.

[0055] In the process of feeding raw materials from the through hole 1 210 to the inner hole 25, the raw materials fed into the through hole 1 210 will be larger, and the total amount of raw materials input will be greater than the total amount of materials required in the annular channel 2 251. Since the total amount of input is greater than the amount output from the annular channel 2 251, another part of the material will be able to be output from the through hole 211, and part of the raw materials will be output through the through hole 211, thereby balancing the total amount of raw materials in the annular channel 2 251, so that the raw materials output from the annular channel 2 251 can be adapted, and the raw materials extruded from the annular channel 2 251 can form a pipeline structure of appropriate thickness. During the extrusion process, the material will form a multi-layer composite structure, and during the extrusion process, each layer of the pipeline can be uniform and appropriate.

[0056] By adjusting the total amount of input through hole 1 210 and output through hole 211, a larger amount of material can be introduced into the inner hole 25, thereby increasing the rotation speed of the rotating part 4, accelerating the rotation efficiency of the rotating part 4, and improving the rotation and operation efficiency of the equipment.

[0057] Reference Figure 7 As shown, the multi-layer pipe production device also includes a screw extruder 1 6 and a screw extruder 2 7. The screw extruder 1 6 and the screw extruder 2 7 can heat and pressurize the material and can transport the molten raw material. One group of the screw extruders can realize the raw material input, and the other group of the screw extruders can realize the circulation of the raw material.

[0058] The screw extruder 1 6 includes a discharge end 1 61 and a feed end 1 62, and the screw extruder 2 7 includes a discharge end 2 71 and a feed end 2 72. The discharge end 1 61 is connected to the guide pipe 1 3, and can transport materials to the guide pipe 1 3, and then can supply raw materials to the inner hole 25, and then can form a structure on the inner side of the pipeline in the annular channel 2 251.

[0059] The second feed end 72 is connected to the guide tube 25, and can output the material of the guide tube 25. The second discharge end 71 is connected to the guide tube 13, and can transport the material to the guide tube 13. The material in the guide tube 25 can be output backward through the screw extruder 27, so that the material can be circulated, and the material in the inner hole 25 can form an axial flow at the through hole 1 210 and the through hole 211.

[0060] Furthermore, both the discharge end 1 61 and the discharge end 2 71 are equipped with a one-way mechanism 8, wherein the one-way mechanism 8 at the discharge end 1 61 can guide the material toward the guide pipe 1 3, and the one-way mechanism 8 at the discharge end 2 71 can also guide the material toward the guide pipe 3. The two one-way mechanisms 8 can realize one-way flow restriction of the material in the pipeline to avoid the backflow of the raw materials in the pipeline. By controlling the delivery volume of the screw extruder 1 6 and the screw extruder 2 7, the total amount of raw materials in the input inner hole 25 can be adjusted to balance the total amount of raw materials in the input annular channel 2 251. The one-way mechanism 8 can adopt a one-way valve for guiding and diverting, which can be suitable for the use requirements of the equipment.

[0061] In addition, the material conveying pipeline can adopt a heat preservation and heating structure, thereby enabling the fluidity of the raw materials to be maintained during the circulation and conveying process.

[0062] Through this multi-layer pipe production device, the production of double-layer structure pipes can be realized. By inputting two raw materials, a double-layer pipe can be formed. If it is necessary to produce pipes with more layers, for example, three-layer or four-layer pipes, multiple groups of multi-layer pipe production devices in this embodiment can be connected to each other, so that the raw materials pass through the multi-layer pipe production device in turn, and then can be extruded to form a multi-layer pipe.

[0063] During the pipe extrusion and transportation process, when the material passes through a set of multi-layer pipe production devices, the two raw materials will form a double-layer pipe structure. Then, when the double-layer pipe enters the next set of multi-layer pipe production devices, the previous double-layer pipe will enter the annular channel 13 of the next set of devices, and the other layer of raw materials will enter the annular channel 251 from the material guide tube 13, forming a three-layer pipe structure. If more layers of pipes need to be produced, multiple sets of devices can be connected in sequence, and through sequential composite extrusion, a multi-layer pipe can be produced.

[0064] Embodiment 3

[0065] This embodiment discloses a PERT multi-layer pipeline, referring to Figure 1 As shown, it includes a main layer 101, an adhesive layer 102, an outer layer 103 and an inner layer 104, and adopts a four-layer structure. The main layer 101, the adhesive layer 102, the outer layer 103 and the inner layer 104 are an integrated structure.

[0066] The outer layer 103 is located outside the main body layer 101, and the adhesive layer 102 is located between the main body layer 101 and the outer layer 103. The main body layer 101 and the outer layer 103 are bonded by the adhesive layer 102, so that the two-layer structure can be stably and firmly bonded and fixed. The inner layer 104 is located inside the main body layer 101. The inner layer 104 can form an inner lining on the inner side of the pipe, and the outer layer 103 can form protection on the outer side of the pipe.

[0067] The main layer 101 is PERT, which plays the main role in the pressure bearing performance of the pipeline. Its thickness is designed according to the requirements of the pipeline. The outer layer 103 is EVOH, which has good oxygen barrier properties and can form protection outside the pipeline to extend the service life of the pipeline. The thickness of the outer layer 103 is generally 0.03-0.07mm, which can meet the requirements of the pipeline.

[0068] The adhesive layer 102 is located between the main layer 101 and the outer layer 103, and serves to bond the two layers of materials. The material of the adhesive layer 102 can be specifically selected according to the material properties of the main layer 101 and the outer layer 103, and can bond the two materials to each other; generally, the thickness of the adhesive layer 102 is 0.05-0.09 mm, and the specific thickness can be suitable for the requirements of the pipeline.

[0069] The inner layer 104 is located at the innermost position of the pipeline, lining the inner side of the pipeline, forming an anti-scaling and antibacterial layer to protect the inner side of the pipeline. Specifically, the main material of the inner layer 104 is PERT, which is substantially the same material as the main layer 101, so that when the main layer 101 and the inner layer 104 are co-extruded, the two layers of material can be smoothly bonded and compounded.

[0070] The main material of the inner layer 104 is also mixed with anti-scaling agent and anti-bacterial agent, so that the material of the inner layer 104 has certain anti-bacterial and anti-scaling properties. Generally, the thickness of the inner layer 104 is 0.08-0.15mm, and the specific thickness can be suitable for the requirements of the pipeline.

[0071] The anti-scaling agent may be a silicone lubricant or other lubricating anti-scaling materials; the antibacterial agent may be a nano-silver material or other antibacterial materials, so that the inner layer 104 can have antibacterial and descaling effects after molding. For example, in the main material of the inner layer 104, the weight of PERT is 92-98 parts, the weight of the anti-scaling agent is 2-6 parts, and the weight of the antibacterial agent is 2-6 parts, and the specific proportion can be determined according to requirements.

[0072] The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A multi-layer pipe production device, comprising a die head (1) and a die core (2), wherein the die head (1) is provided with a center hole (11) with two ends passing through, the die core (2) is arranged in the center hole (11), the center hole (11) has an input end (111) and an output end (112), and an annular channel (13) is formed between the die head (1) and the die core (2); It is characterized in that The mold core (2) comprises an inner ring body (21) and a second center column (24); the inner ring body (21) is provided with an inner hole (25), which is closed on the side facing the input end (111) and opened on the side facing the output end (112); a portion of the second center column (24) extends into the inner hole (25) of the inner ring body (21), and a portion of the second center column (24) extends out from the opening of the inner hole (25); and a second annular channel (251) is formed between the inner ring body (21) and the second center column (24); The inner ring body (21) is provided with a through hole (210), the through hole (210) being connected to the inner hole (25), and further comprising a material guide pipe (3), the material guide pipe (3) being connected to the through hole (210) and being used for conveying raw materials to the inner hole (25), a rotating member (4) being arranged inside the inner hole (25), the rotating member (4) being sleeved outside the center column (24) and being capable of rotating relative to the center column (24); The mold core (2) further comprises an outer ring body (27), the outer ring body (27) being sleeved on the outer periphery of the inner ring body (21), a material transfer channel (28) being formed between the outer ring body (27) and the inner ring body (21), the material transfer channel (28) being in communication with an annular channel 1 (13); the outer ring body (27) and the inner ring body (21) are connected and fixed via a plurality of connecting portions (29), the through hole 1 (210) being provided in the connecting portion (29) and extending to the outer periphery of the outer ring body (27); The inner ring body (21) is provided with a second through hole (211), one end of which is connected to the inner hole (25), and the other end of which extends outward along the connecting portion (29) and forms an opening on the outer periphery of the outer ring body (27); a second material guide tube (5) is fixedly connected to the outer periphery of the die head (1), and the second material guide tube (5) is connected to the opening of the second through hole (211) on the outer periphery of the outer ring body (27); the second material guide tube is used for outputting the raw material in the inner hole (25); the first through hole (210) and the second through hole (211) are both arranged along the tangent direction of the second annular channel (251), and the first through hole (210) and the second through hole (211) are coaxial.

2. A multi-layer pipe production device according to claim 1, characterized in that: The mold core (2) further comprises a fixed block (23) and a center column one (22); the side of the inner ring body (21) facing the input end (111) is closed by the fixed block (23); the center column one (22) and the center column two (24) are both coaxially fixedly connected to the fixed block (23); the center column one (22) faces the side of the input end (111), and the center column two (24) faces the side of the output end (112).

3. A multi-layer pipe production device according to claim 1, characterized in that: A fixed end (241) is formed at one end of the second center column (24), and the fixed end (241) is fixedly connected to the fixed block (23). A connecting hole (41) is provided inside the rotating member (4), and the connecting hole (41) is rotatably connected to the fixed end (241) of the second center column (24). A plurality of fins (42) are fixedly connected to the outer periphery of the rotating member (4), and the fins (42) are evenly distributed in a ring shape.

4. A multi-layer pipe production device according to claim 3, characterized in that: The fin (42) comprises a first end (421) and a second end (422), the first end (421) extends in the direction of the input end (111), the second end (422) extends in the direction of the output end (112), and the first end (421) is located at the position of the through hole 1 (210); The fixed end (241) has a stepped structure, forming a stepped surface (242) facing the stepped surface (242) of the fixed block (23); an annular groove is formed between the stepped surface (242) and the fixed block (23); and the rotating member (4) is located in the annular groove.

5. A multi-layer pipe production device according to claim 1, characterized in that: The through hole 1 (210) is arranged along the tangent direction of the annular channel 2 (251).

6. A multi-layer pipe production device according to claim 1, characterized in that: It also includes a screw extruder 1 (6) and a screw extruder 2 (7), wherein the screw extruder 1 (6) includes a discharge end 1 (61) and a feed end 1 (62), wherein the discharge end 1 (61) is connected to a material guide pipe 1 (3) and can transport materials to the material guide pipe 1 (3); The screw extruder 2 (7) comprises a discharge end 2 (71) and a feed end 2 (72), wherein the feed end 2 (72) is connected to the guide pipe 2 (5) and can supply material from the guide pipe 2 (5), and the discharge end 2 (71) is connected to the guide pipe 1 (3) and can transport material to the guide pipe 1 (3); both the discharge end 1 (61) and the discharge end 2 (71) are provided with a one-way mechanism (8), and the one-way mechanism (8) is used to guide material unidirectionally toward the guide pipe 1 (3).

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