PVC-U electrician pipe and preparation method thereof

Abstract

The application discloses a PVC-U electrician pipe, which comprises a PVC outer pipe, a pipe inner partition support matched with the PVC outer pipe, a PVC inner pipe, at least six T-shaped insertion grooves arranged on the outer wall of the PVC inner pipe, a partition plate matched with the insertion grooves, and at least three partition plates matched with the PVC inner pipe; the distance between the end face of the partition plate, which is away from the PVC inner pipe, and the center of the PVC inner pipe is less than half of the inner diameter of the PVC outer pipe; the end face of the partition plate, which is away from the PVC inner pipe, is provided with a rectangular groove, and an air bag block is arranged in the rectangular groove; a threading space is formed between the adjacent partition plates between the outer wall of the PVC inner pipe and the inner wall of the PVC outer pipe; and a shielding structure is arranged in each space. The PVC-U electrician pipe does not need to change the existing preparation process of the PVC-U electrician pipe, has small technical improvement degree, and can realize that different functional wires can be threaded in one PVC-U electrician pipe; and the PVC-U electrician pipe can be adjusted during on-site work, has good flexibility, and has wide adaptability.

Description

TECHNICAL FIELD

[0001] The present application relates to a PVC-U electrician pipe and a preparation method thereof. BACKGROUND

[0002] Color electrician pipe, also known as color threading pipe, color electrician sleeve, color PVC electrician pipe. Usually refers to color hard PVC flame-retardant insulating cold-bending electrician sleeve, the main component is polyvinyl chloride, other components are added to enhance its flame-retardant performance, compression resistance, heat resistance, toughness and ductility, and different color color mothers are added to change its color, so that it can be distinguished by different colors in circuit installation. It has excellent insulating properties, can withstand high voltage without breakdown, and eliminates the risk of electric shock. It can self-extinguish (self-extinguish within 30 seconds of leaving the flame), avoiding the spread of fire along the pipeline; the pipe body does not conduct heat, effectively protecting the line safety. It has excellent impact resistance and can withstand external pressure, is suitable for open installation or embedding in concrete, and is not easy to deform under pressure; it is not easy to crack when bent by hand with a spring under low temperature conditions (-5℃ or above). It has excellent acid and alkali resistance, does not contain plasticizers, and prevents damage to the line by rodents. The material is light, easy to cut, flexible to install, and convenient for transportation and construction operation, reducing decoration costs. Its uses are as follows: PVC-U electrician pipe, also known as color PVC electrician pipe, has fully opened the market in the field of home decoration, mainly for individual home decoration color circuit wiring application, "color separation" for strong and weak electric isolation management and laying. Patent No. CN106058750B: a PVC electrician pipe, comprising a pipe body, a plurality of inner pipes for accommodating power lines or signal lines are arranged in the pipe body, an elastic air bag is arranged in the pipe body for fixing the inner pipes to the inner wall of the pipe body, the contact parts of the elastic air bag and the inner pipes are both isolation surfaces made of hard rubber, and a metal mesh for electromagnetic shielding is arranged on the outer wall of the pipe body and in the isolation surface. Although it can separate different functions such as signal lines, neutral lines and live lines and place them in the same PVC-U electrician pipe, such PVC-U electrician pipe has a complex structure, and the existing PVC-U electrician pipe preparation needs to be changed. For electrician pipe manufacturers, the existing preparation process needs to be changed. And it needs to adjust the number of isolation surfaces 32 and inner pipes 2 during production according to different needs, which cannot be adjusted flexibly on site. SUMMARY

[0003] The present application aims to overcome the defects in the prior art, provide a PVC-U electrician pipe that does not need to change the existing PVC-U electrician pipe preparation process, has a small degree of technical improvement, and still can realize that different functions of lines can be threaded in one PVC-U electrician pipe; and can be adjusted on site, has good flexibility and wide adaptability.

[0004] To achieve the above object, the technical scheme of the present application is to design a PVC-U electrician pipe, which comprises a PVC outer pipe, a pipe inner separation support arranged in the PVC outer pipe, the pipe inner separation support comprising a PVC inner pipe, the PVC inner pipe being provided with at least six T-shaped insertion grooves on the outer wall thereof, and a partition plate being arranged in the T-shaped insertion grooves, and at least three partition plates being arranged in the PVC inner pipe.

[0005] The end face of the partition plate away from the PVC inner pipe is provided with a rectangular groove, and an air bag block is arranged in the rectangular groove.

[0006] The adjacent partition plates are arranged in the PVC outer pipe, and a shielding structure is arranged in each threading space. The air bag block is fixedly connected to the groove bottom wall of the T-shaped insertion groove, and the surface of the air bag block facing the groove side wall of the T-shaped insertion groove can also be fixedly connected to the groove side wall of the T-shaped insertion groove. The PVC outer pipe is originally a PVC-U electrician pipe, which is still used as a threading pipe and has not changed its structure and composition, so it can be produced according to the existing production process. The pipe inner separation support is arranged in the PVC outer pipe to separate the original threading space of the PVC outer pipe, and the shielding structure in each threading space can ensure that the separated threading space is used for threading lines with different functions (such as live wire, zero wire or signal wire) and also ensures the shielding property. The PVC inner pipe is provided with at least six T-shaped insertion grooves on the outer wall thereof, so that the electrician can adjust the number of threading spaces in the PVC-U electrician pipe according to different site conditions during on-site work, thereby improving the flexibility and adaptability of the PVC-U electrician pipe. The distance between the end face of the partition plate away from the PVC inner pipe and the center of the PVC inner pipe is less than half of the inner diameter of the PVC outer pipe, so that the pipe inner separation support can be easily put into (PVC outer pipe) and taken out (PVC outer pipe), and the gap between the end face of the partition plate and the inner wall of the PVC outer pipe can be filled by the air bag block after the pipe inner separation support is put in, thereby ensuring the independence and shielding property of each threading space.

[0007] Further, the shielding structure comprises a shielding alloy layer coated on the surface of the partition plate and the air bag block. The shielding alloy layer coated on the surface of the partition plate and the air bag block can ensure that the pipe inner separation support tightly abuts against the inner wall of the PVC outer pipe after being inserted into the PVC inner pipe and the partition plate, and the independence and shielding property of each threading space are ensured.

[0008] Another technical solution is that the shielding structure comprises a metal mesh shielding sleeve fixedly connected with each partition plate. In this way, the shielding structure is more convenient to form, and the metal mesh can be wrapped around a small-sized PVC pipe to form the shielding structure, and then the wire can be threaded in the small-sized PVC pipe.

[0009] A further technical solution is that the air bag block is provided with an inflation nozzle and a deflation nozzle on the two end faces in the length direction respectively; the air bag block is in the shape of a cuboid after being inflated and the width is greater than the groove depth of the rectangular groove of the partition plate end face. In this way, the wire threading space formed between adjacent partition plates can be truly separated and independent by inflating the air bag block after on-site threading installation, so as to ensure the shielding performance of each wire threading space.

[0010] A further technical solution is that the air bag block is made of hard rubber material. In this way, the air bag block has a certain "hardness" and is not a completely flexible air bag, so that the air bag block can stretch and contract in the radial direction of the PVC inner pipe when inflated (such air bag with a certain directionality is prior art and will not be described here).

[0011] A further technical solution is that the PVC inner pipe and the PVC outer pipe are made of the same material; the PVC outer pipe is made of SG-5 type PVC resin, stabilizer, lubricant, filler and color master batch.

[0012] A further technical solution is that the viscosity of the SG-5 type PVC resin is (1.7-1.8) x 10 -3 Pa.s; the stabilizer is lead tri-basic sulfate; the lubricant is calcium stearate; the filler is calcium carbonate and barite powder; the weight fractions of each raw material are as follows: PVC resin 90-210 parts, calcium carbonate 2-7 parts, barite powder 3-5 parts, calcium stearate 5-6 parts, lead tri-basic sulfate 10-20 parts;

[0013] The preparation raw materials of the PVC outer pipe further include 15-35 parts of dioctyl phthalate, 10-30 parts of chlorinated paraffin and fillers;

[0014] The fillers include 15-20 parts of kaolin and 4-6 parts of rubber powder.

[0015] The present application also provides a technical solution for a method for preparing a PVC-U electrician pipe, which comprises the following process steps performed in sequence:

[0016] S1: The PVC resin, lubricant and filler are added to an exhaust type double screw extruder, and after being uniformly stirred, the stabilizer, filler and color master batch are added, and granules are extruded;

[0017] S2: the granular material in step S1 is placed into a single screw pipe extrusion molding machine, and a pipe is obtained through extrusion molding, and the pipe is cooled and cut to obtain a PVC inner pipe or a PVC outer pipe;

[0018] S3: a T-shaped insertion slot is formed on the outer wall of the PVC inner pipe;

[0019] S4: a shielding alloy layer is formed by winding an alloy belt on the outer surface of the partition plate and the air bag block through an alloy belt longitudinal wrapping device;

[0020] Or a metal wire mesh shielding sleeve is formed by winding an alloy belt on the outer surface of a PVC pipe with a smaller diameter than the PVC inner pipe through an alloy belt longitudinal wrapping device.

[0021] Since the existing PVC-U electrician pipe preparation process is not changed, the existing PVC threading pipe preparation process can be basically used. In the present scheme, the temperature in the exhaust type double screw extruder includes the barrel temperature and the die temperature, the barrel temperature is divided into seven zones, the control zone temperature is 165-185 DEG C, the second zone temperature is 170-210 DEG C, the third zone temperature is 220-230 DEG C, the fourth zone temperature is 225-249 DEG C, the fifth zone temperature is 242-251 DEG C, the sixth zone temperature is 250-270 DEG C, the seventh zone temperature is 250-283 DEG C, and the die temperature is 248-259 DEG C; wherein the temperature in the single screw extruder includes the barrel temperature and the die temperature, the barrel temperature is divided into seven zones, the control zone temperature is 184-188 DEG C, the second zone temperature is 207-218 DEG C, the third zone temperature is 219-225 DEG C, the fourth zone temperature is 232-247 DEG C, the fifth zone temperature is 249-253 DEG C, the sixth zone temperature is 260-266 DEG C, the seventh zone temperature is 261-270 DEG C, and the die temperature is 242-249 DEG C.

[0022] The present application has the advantages and benefits that the existing PVC-U electrician pipe preparation process does not need to be changed, the technical improvement degree is small, and different functional wires can be threaded in one PVC-U electrician pipe; and the adjustment can be made on site, the flexibility is good, and the adaptability is wide.

[0023] The PVC outer pipe is originally PVC-U electrician pipe, still as a threading pipe, without changing its structure and composition, so it can be prepared according to the existing production process; the inner pipe is provided with an inner pipe partition support for separating the original threading space of the PVC outer pipe through the inner pipe partition support, and the shielding structure in each threading space can ensure that the separated threading space is used for threading lines with different functions (such as live wire, zero line or signal line) and also ensures the shielding property. The inner wall of the PVC inner pipe is provided with at least six T-shaped insertion grooves, so that the electrician can adjust the number of threading spaces in the PVC-U electrician pipe according to different site conditions during on-site work, improving the flexibility and adaptability of the PVC-U electrician pipe. The end face of the partition plate away from the PVC inner pipe is less than half the inner diameter of the PVC outer pipe, so that the inner pipe partition support can be easily put into (PVC outer pipe) and taken out (PVC outer pipe), and the gap between the partition plate end face and the inner wall of the PVC outer pipe is filled by the air bag block after the inner pipe partition support is put in, ensuring the independence and shielding property of each threading space. The threading space formed between adjacent partition plates is not provided with other filling structures to ensure sufficient space for threading.

[0024] The surface of the partition plate and the air bag block is coated with a shielding alloy layer, which can ensure that the inner pipe partition support tightly abuts against the inner wall of the PVC outer pipe after being inserted into the PVC inner pipe and the partition plate, and the independence of each threading space is ensured, and the shielding property of the threading space is ensured.

[0025] The shielding structure includes a metal mesh shielding sleeve fixedly connected with each partition plate. After being set in this way, it is more convenient to form a shielding structure, and a metal mesh can be wrapped around a small-sized PVC pipe to form a shielding structure, and then threading can be performed in the small-sized PVC pipe.

[0026] The air bag block is provided with an inflation nozzle and an exhaust nozzle on the two end faces in the length direction; the air bag block is in the shape of a cuboid after being inflated, and the width is greater than the groove depth of the rectangular groove of the partition plate end face. After being set in this way, the threading space formed between adjacent partition plates can be truly separated and independent by inflating the air bag block after on-site threading and installation, and the shielding performance of each threading space is ensured.

[0027] The air bag block is made of hard rubber material. In this way, the air bag block has a certain "hardness" and is not a completely flexible air bag, so that the air bag block can stretch and contract in the radial direction of the PVC inner pipe when being inflated; BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 is a working state schematic diagram of one embodiment of the PVC-U electrician pipe of the present application;

[0029] Figure 2 is Figure 1 a side view of the;

[0030] Figure 3 is Figure 2 a working state schematic diagram of separating three threading spaces;

[0031] Figure 4 is Figure 2 a working state schematic diagram of separating four threading spaces;

[0032] Figure 5 is Figure 2 a working state schematic diagram of separating six threading spaces;

[0033] Figure 6 is Figure 2 an enlarged schematic diagram of the PVC inner tube in the;

[0034] Figure 7 is Figure 3 a side view of the partition plate in the;

[0035] Figure 8 is Figure 7 an exploded schematic diagram of the partition plate and the air bag block in the;

[0036] Figure 9 is Figure 3 an enlarged schematic diagram of the partition plate in the;

[0037] Figure 10 is Figure 9 an exploded schematic diagram of the;

[0038] Figure 11 is a working state schematic diagram of separating three threading spaces of the PVC-U electrician pipe in the second embodiment of the application;

[0039] Figure 12 is a working state schematic diagram of separating four threading spaces of the PVC-U electrician pipe in the second embodiment of the application.

[0040] In the figure: 1, PVC outer tube; 2, PVC inner tube; 3, plug-in slot; 4, partition plate; 5, air bag block; 6, threading space; 7, shielding alloy layer; 8, inflation nozzle; 9, exhaust nozzle; 10, metal wire mesh shielding sleeve; 11, PVC pipe. DETAILED DESCRIPTION

[0041] The specific embodiments of the application will be further described below in combination with the drawings and examples. The following examples are only used to more clearly illustrate the technical solutions of the application, and cannot be used to limit the protection scope of the application.

[0042] Example 1:

[0043] AsFigures 1 to 10 As shown ( Figure 1 (No partitions or airbags shown). This invention relates to a PVC-U electrical conduit, comprising a PVC outer tube 1 and an internal partition support fitted to the PVC outer tube 1. The internal partition support includes a PVC inner tube 2, the outer wall of which has at least six T-shaped insertion slots 3. Partitions 4 are fitted to the insertion slots 3, and at least three partitions 4 are fitted to the PVC inner tube 2. The distance between the end face of the partition 4 inserted into the PVC inner tube 2 and the center of the PVC inner tube 2 is less than half the inner diameter of the PVC outer tube 1. The end face of the partition 4 away from the PVC inner tube 2 has a rectangular groove, and an airbag 5 is placed in the rectangular groove. A wire-passing space 6 is formed between adjacent partitions 4 between the outer wall of the PVC inner tube 2 and the inner wall of the PVC outer tube 1. Each wire-passing space 6 has a shielding structure. The shielding structure includes a shielding alloy layer 7 covering the surface of the partitions 4 and the airbag 5. The airbag block 5 has an inflation nozzle 8 and an exhaust nozzle 9 on its two ends along its length, respectively; when fully inflated, the airbag block 5 is rectangular and its width is greater than the depth of the rectangular groove on the end face of the partition plate 4. The airbag block 5 is made of hard rubber.

[0044] The inner PVC tube 2 and the outer PVC tube 1 are made of the same material. The outer PVC tube 1 is made by extrusion molding of SG-5 type PVC resin, stabilizer, lubricant, filler, and color masterbatch. The viscosity of SG-5 type PVC resin is (1.7~1.8)×10-3 Pa.s; the stabilizer is tribasic lead sulfate; the lubricant is calcium stearate; the filler is calcium carbonate and barite powder. The weight parts of each raw material are as follows: 90~210 parts of PVC resin, 2~7 parts of calcium carbonate, 3~5 parts of barite powder, 5~6 parts of calcium stearate, and 10~20 parts of tribasic lead sulfate. The raw materials for preparing the outer PVC tube 1 also include 15-35 parts of dioctyl phthalate, 10-30 parts of chlorinated paraffin, and filler. The filler includes 15-20 parts of kaolin and 4-6 parts of rubber powder.

[0045] The method for preparing PVC-U electrical conduit includes the following sequential process steps:

[0046] S1: Add PVC resin, lubricant, and filler to a vented twin-screw extruder, stir evenly, then add stabilizer, filler, and color masterbatch, and extrude to obtain granules;

[0047] S2: Place the granules from step S1 into a single-screw pipe extrusion molding machine, extrude and form pipes, and cut the pipes after cooling to obtain PVC inner pipe 2 or PVC outer pipe 1.

[0048] S3: A T-shaped insertion groove 3 is opened on the outer wall of the PVC inner pipe 2;

[0049] S4: A shielding alloy layer 7 is formed by wrapping and winding the outer surface of the partition 4 and the airbag block 5 with an alloy strip longitudinal wrapping device.

[0050] The working principle is as follows:

[0051] According to the site conditions, the electrician prepares the inner partition bracket before wiring (that is, inserts the partition from the side wall of the PVC inner pipe through the T-shaped insertion groove of the PVC inner pipe), then inserts the inner partition bracket into the PVC outer pipe, and then starts wiring in the wiring space of the adjacent partition, wiring wires with different functions in different wiring spaces. After wiring, the airbag is filled with air through the air inflator.

[0052] Example 2:

[0053] The difference from Embodiment 1 is that, as Figure 11 , Figure 12 As shown, the shielding structure includes a metal wire mesh shielding sleeve 10 fixedly connected to each partition 4. The metal wire mesh shielding sleeve is formed on the outer surface of a PVC pipe 11 with a diameter smaller than that of the PVC inner pipe by winding it with an alloy tape longitudinal wrapping device.

[0054] The working principle is as follows:

[0055] According to the site conditions, the electrician prepares the inner partition bracket before wiring (that is, inserts the partition from the side wall of the PVC inner pipe through the T-shaped insertion groove of the PVC inner pipe), then inserts the inner partition bracket into the PVC outer pipe, and then starts to wire in the PVC pipe 11, threading wires with different functions into different PVC pipes 11. After the wires are threaded, the airbag is filled with air through the air inflator.

[0056] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A method of producing PVC-U electrotechnical tubing, characterized in that, The process comprises the following process steps in sequence: S1: PVC resin, lubricant, and filler are added to an exhaust double-screw extruder, and after being stirred uniformly, stabilizer, filler, and color masterbatch are added, and granules are obtained by extrusion; S2: The granules in step S1 are placed into a single-screw pipe extrusion molding machine, and pipe material is obtained by extrusion molding, and after cooling, PVC inner pipe or PVC outer pipe is obtained by cutting; S3: A T-shaped insertion groove is formed on the outer wall of the PVC inner pipe; S4: A shielding alloy layer is formed by winding an alloy belt longitudinally on the outer surface of the partition plate and the air bag block; Alternatively, a metal wire mesh shielding sleeve is formed by winding an alloy belt longitudinally on the outer surface of a PVC pipe with a smaller diameter than the PVC inner pipe; the PVC inner pipe has eight T-shaped insertion grooves on the outer wall of the pipe wall to realize three or four or six space areas of the same size, and a partition plate is arranged in the insertion groove; three or four or six partition plates are arranged in the PVC inner pipe; the air bag block has an air inlet and an air outlet on the two ends in the length direction; the air bag block is in the shape of a cuboid after being filled with air, and the width of the air bag block is greater than the depth of the rectangular groove of the partition plate.

2. A PVC-U electrician's conduit produced by the method of claim 1, characterised in that, The PVC outer pipe is provided with a pipe inner partition support, and the pipe inner partition support comprises a PVC inner pipe, and the PVC inner pipe has eight T-shaped insertion grooves on the outer wall of the pipe wall to realize three or four or six space areas of the same size, and a partition plate is arranged in the insertion groove; three or four or six partition plates are arranged in the PVC inner pipe; The distance between the end face of the partition plate away from the PVC inner pipe and the center of the PVC inner pipe is less than half of the inner diameter of the PVC outer pipe; the end face of the partition plate away from the PVC inner pipe is provided with a rectangular groove, and an air bag block is arranged in the rectangular groove; Adjacent partition plates between the outer wall of the PVC inner pipe and the inner wall of the PVC outer pipe form a threading space; a shielding structure is arranged in each threading space; The shielding structure comprises a shielding alloy layer wrapped on the surface of the partition plate and the air bag block; or the shielding structure comprises a metal wire mesh shielding sleeve fixedly connected with each partition plate; the air bag block is in the shape of a cuboid after being filled with air, and the width of the air bag block is greater than the depth of the rectangular groove of the end face of the partition plate.

3. A PVC-U electrician's conduit according to claim 2, characterised in that, The air bag block is made of hard rubber.

4. A PVC-U electrician's conduit according to claim 2, characterised in that, The PVC inner pipe and the PVC outer pipe are made of the same material; the PVC outer pipe is made of SG-5 PVC resin, stabilizer, lubricant, filler, and color masterbatch.

5. A PVC-U electrician's conduit according to claim 4, characterised in that, The viscosity of the SG-5 PVC resin is (1.7-1.8)×10-3Pa.s; the stabilizer is tribasic lead sulfate; the lubricant is calcium stearate; the filler is calcium carbonate and barite powder; the weight fractions of the raw materials are as follows: PVC resin 90-210 parts, calcium carbonate 2-7 parts, barite powder 3-5 parts, calcium stearate 5-6 parts, tribasic lead sulfate 10-20 parts; The preparation raw materials of the PVC outer pipe further comprise 15-35 parts of dioctyl phthalate, 10-30 parts of chlorinated paraffin, and filler; The filler comprises 15-20 parts of kaolin and 4-6 parts of rubber powder.

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