CPVC power cable protection pipe provided with docking mechanism

Abstract

The invention provides a CPVC power cable protection pipe provided with a butt joint mechanism, and relates to the technical field of cable protection, the CPVC power cable protection pipe comprises a first pipe body and a second pipe body, an anti-bending member is arranged between the first pipe body and the second pipe body, and the periphery of the first pipe body and the second pipe body is also provided with an anti-compression member; the anti-bending piece is composed of a corrugated pipe, and the corrugated pipe is arranged between the first pipe body and the second pipe body. The compression-resistant piece comprises steel nails and an arc-shaped plate, and the arc-shaped plate is arranged on the periphery of the corrugated pipe. The corrugated pipe has certain bending buffering flexibility and is located between the first pipe body and the second pipe body, and the corrugated pipe can be bent and deformed to a certain degree along with sedimentation of soil to cope with the relative displacement difference between the first pipe body and the second pipe body; therefore, stress concentration and damage of the first pipe body and the second pipe body caused by soil settlement are avoided, the safety of the power cable can be ensured, and convenience is provided for replacement and maintenance of the first pipe body and the second pipe body.

Description

Technical Field

[0001] The invention relates to the technical field of cable protection, and in particular to a CPVC power cable protection tube provided with a docking mechanism. Background Art

[0002] CPVC power cable protection pipe is a pipe used to protect power cables. It has many characteristics and advantages. It is made of CPVC (chlorinated polyvinyl chloride) resin with excellent heat resistance and insulation performance as the main material. CPVC products are recognized as green and environmentally friendly products. Its excellent physical and chemical properties are increasingly valued by the industry. Its inner and outer walls are smooth and flat, and its color is orange-red, bright and eye-catching. Compared with ordinary UPVC double-wall corrugated pipes, its heat resistance temperature is 15℃ higher, and it can remain unchanged in an environment above 93℃. It has sufficient strength and is suitable for environments with higher temperatures25. At the same time, it can withstand high voltages of more than 30,000 volts. In urban power grids, its electrical insulation performance is greater than that of power cables. It is highly safe to use and can withstand the impact of a 1kg hammer and a height of 2m at a temperature of 0°C. It has good low-temperature impact performance and can adapt to the requirements of construction environment conditions. It also has flame retardant properties and can be extinguished immediately away from fire. In particular, CPVC materials have significantly higher chlorine content than PVC, so their flame retardancy and smoke density index are significantly improved. They are widely used in urban power grid construction and reconstruction, urban municipal reconstruction projects, civil aviation airport engineering construction, engineering park and community engineering construction, transportation and road and bridge engineering construction, urban street lamp cable laying, telecommunications, cable TV signal metropolitan area network cables and optical cable laying sheath pipe networks, etc.

[0003] For example, the prior art application number CN202223210838.2 discloses a CPVC power cable protection tube, wherein the fixing device includes a fixing disk, the fixing disk and the first protection tube are fixedly connected, the surface of the second protection tube is slidably connected with a sliding disk, the surface of the sliding disk is fixedly installed with two penetration rods, the outer wall surfaces of the two penetration rods are provided with limiting holes, the surface of the fixing disk is provided with two through holes, the upper and lower annular outer wall surfaces of the fixing disk are fixedly installed with sliding rods, the surfaces of the two sliding rods are slidably connected with slide plates, the surface of the slide plates is fixedly installed with limiting rods, the surface of the slide plates is fixedly installed with limiting plates, the surface of the slide plates is fixedly installed with limiting plates, the surface of the slide plates is fixedly installed with a limiting plate, and a spring is fixedly installed between the limiting plate and the slide plates;

[0004] It is known through actual use that the above-mentioned prior art mainly uses a fixing mechanism to rigidly connect the two sections of the protective pipe together. However, after the two sections of the protective pipe are rigidly connected and buried underground, in areas where the soil is relatively soft and prone to settlement, over time, the squeezing of the soil will cause the two sections of the protective pipe to produce relative displacement, so that the connection parts between the two sections of the protective pipe are subjected to greater stress, resulting in the connection parts gradually loosening and deformation, causing damage to the pipe body. It is difficult to separate the two sections of the protective pipe when replacing and maintaining the pipe body, which brings instability to use. For this reason, we have improved the above-mentioned prior art based on actual usage. Summary of the invention

[0005] After the two sections of the protective pipe are rigidly connected and buried underground, in areas where the soil is relatively soft and prone to settlement, over time, the squeezing of the soil will cause the two sections of the protective pipe to produce relative displacement, so that the connection parts between the two sections of the protective pipe are subjected to greater stress, causing the connection parts to gradually loosen and deform, causing damage to the pipe body. It is difficult to separate the two sections of the protective pipe when replacing and maintaining the pipe body, which brings constant problems in use. The present invention aims to provide a CPVC power cable protective pipe provided with a connection mechanism.

[0006] To achieve the technical purpose, the solution of the present invention is: a CPVC power cable protection tube provided with a docking mechanism, comprising a No. 1 tube body and a No. 2 tube body, an anti-bending part is provided between the No. 1 tube body and the No. 2 tube body, and an anti-pressure part is also provided on the periphery of the No. 1 tube body and the No. 2 tube body; the anti-bending part is composed of a corrugated tube, and the corrugated tube is provided between the No. 1 tube body and the No. 2 tube body; the anti-pressure part comprises a steel nail and an arc plate, the arc plate is provided on the periphery of the corrugated tube, and the steel nail is provided on both sides of the No. 1 tube body and the No. 2 tube body.

[0007] Preferably, outer surfaces of the ends of the No. 1 pipe body and the No. 2 pipe body that are close to each other are respectively provided with forward threads and reverse threads for installing the corrugated pipe.

[0008] Preferably, both ends of the corrugated pipe are integrally provided with collars, and the inner wall of each collar is provided with internal threads for threaded connection with one end of the No. 1 pipe body and the No. 2 pipe body close to each other, and the internal threads and the forward threads and the reverse threads cooperate with each other.

[0009] Preferably, a retaining ring is integrally provided on the outer surface of one end of the No. 1 tube body and the No. 2 tube body close to each other, and an annular groove is opened inside the outer side of each ring, a sealing ring is fixed in the annular groove and the outer side of the sealing ring and the retaining ring are pressed against each other.

[0010] Preferably, a No. 1 sponge block is fixed to the inner wall of the bellows by glue, and a plurality of the No. 1 sponge blocks are arranged in a ring with the center of the bellows, each of the bellows is arranged in an arc shape, and each of the bellows is provided with an air hole.

[0011] Preferably, ear blocks are integrally provided on both sides of the No. 1 tube body and the No. 2 tube body, and a steel nail passes through each of the ear blocks.

[0012] Preferably, a connecting rod can be folded and arranged on the outer surface of the lower half of each steel nail, and the connecting rod is arranged at an angle. A mounting block is provided on the outer sleeve of the steel nail, and the lower surface of the mounting block is rotatably arranged with the upper surface of the ear block.

[0013] Preferably, one end of each of the mounting blocks away from the ear block is welded to one end of the arc-shaped plate, and a gap is provided between the head and tail ends of the two arc-shaped plates.

[0014] Preferably, the inner wall of each ear block is riveted with a No. 2 sponge block, the No. 2 sponge block is arranged in an arc shape, the No. 2 sponge block is located between the No. 1 tube body and the steel nail or the No. 2 tube body and the steel nail, and the inner wall of the No. 2 sponge block is respectively pressed against both sides of the No. 1 tube body and the No. 2 tube body;

[0015] 1. In the present invention, the corrugated pipe has a certain bending buffer flexibility. The corrugated pipe is located between the first pipe body and the second pipe body. It can bend and deform to a certain extent with the settlement of the soil to cope with the relative displacement difference between the first pipe body and the second pipe body, thereby avoiding the stress concentration and damage of the first pipe body and the second pipe body caused by soil settlement, ensuring the safety of the power cable and providing convenience for the replacement and maintenance of the first pipe body and the second pipe body;

[0016] 2. Two arc-shaped plates wrap around the outer periphery of the bellows to protect the bellows, resist the pressure of the soil on the bellows, and prevent the bellows from being damaged;

[0017] 3. The steel nails and connecting rods are nailed into the ground, and a triangular stable structure is formed between the steel nails and the connecting rods after they are unfolded, which greatly enhances the side support effect on the No. 1 and No. 2 pipe bodies, effectively resists the soil pressure from different directions, and improves the firmness of the No. 1 and No. 2 pipe bodies. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0019] Figure 2 It is a top view schematic diagram of the present invention;

[0020] Figure 3 It is a schematic diagram of the anti-bending member of the present invention;

[0021] Figure 4It is a schematic diagram of the connection between the bellows and the sponge block No. 1 of the present invention;

[0022] Figure 5 It is a schematic diagram of the structure of the compression-resistant member of the present invention;

[0023] Figure 6 For the present invention Figure 1 The enlarged schematic diagram at a in the middle;

[0024] Figure 7 For the present invention Figure 3 Enlarged schematic diagram at point b in the middle.

[0025] Among them, 1. No. 1 pipe body; 2. No. 2 pipe body; 3. Anti-bending part; 31. Bellows; 32. No. 1 sponge block; 33. Ring; 34. Internal thread; 35. Air vent; 36. Annular groove; 37. Sealing ring; 4. Cable body; 5. Anti-pressure part; 51. Steel nail; 52. Arc plate; 53. No. 2 sponge block; 54. Connecting rod; 55. Ear block; 56. Mounting block; 6. Forward thread; 7. Reverse thread; 8. Retaining ring. DETAILED DESCRIPTION

[0026] The invention of this application is further described in detail below in conjunction with the accompanying drawings and specific embodiments. In order to clearly and completely describe the technical solution, the following embodiments are selected for illustration; based on the contents recorded in this application, other embodiments obtained without creative work are all within the scope of protection of the present invention.

[0027] In the following embodiments, it should be noted that the terms "upper", "lower", "left", "right", "inside", "outside", "top / bottom" and other orientations or positional relationships are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of clearly describing the present embodiment, rather than indicating or implying that the device or element referred to must have a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0028] like Figures 1 to 7 As shown, an embodiment of the present invention provides a CPVC power cable protection tube provided with a docking mechanism, including a No. 1 tube body 1 and a No. 2 tube body 2, an anti-bending member 3 is provided between the No. 1 tube body 1 and the No. 2 tube body 2 to cope with the displacement of the No. 1 tube body 1 and the No. 2 tube body 2, and an anti-pressure member 5 is also provided on the periphery of the No. 1 tube body 1 and the No. 2 tube body 2 to resist the pressure of the soil; the anti-bending member 3 is composed of a corrugated tube 31, and the corrugated tube 31 is arranged between the No. 1 tube body 1 and the No. 2 tube body 2; the anti-pressure member 5 includes a steel nail 51 and an arc plate 52, the arc plate 52 is arranged on the periphery of the corrugated tube 31, and the steel nail 51 is arranged on both sides of the No. 1 tube body 1 and the No. 2 tube body 2;

[0029] The bellows 31 will be located between the first pipe body 1 and the second pipe body 2. The bellows 31 has a certain bending buffer flexibility. The length of the bellows 31 is 30-120 cm. The bellows 31 can bend and deform to a certain extent with the settlement of the soil to cope with the relative displacement difference between the first pipe body 1 and the second pipe body 2, thereby avoiding stress concentration and damage to the first pipe body 1 and the second pipe body 2 caused by soil settlement. When the bellows 31 is used to connect the first pipe body 1 and the second pipe body 2 and buried underground, the following requirements need to be considered:

[0030] Corrosion resistance: There may be various corrosive substances in the underground environment, such as acidic soil, alkaline groundwater, etc. Therefore, the bellows 31 should have good corrosion resistance to prevent the pipe from being corroded and affecting the service life and sealing performance. Corrosion-resistant plastic bellows 31, such as polyvinyl chloride (PVC), high-density polyethylene (HDPE) and other materials, or metal bellows 31 with anti-corrosion coating and bellows 31 with steel mesh can be selected.

[0031] Aging resistance: After being buried underground for a long time, the bellows 31 will be affected by various environmental factors, such as temperature changes, ultraviolet radiation (although the ultraviolet radiation has little effect after being buried, it may be exposed to a certain extent during production, storage and installation), etc., so it needs to have good aging resistance to ensure the stability of material properties during long-term use. Generally speaking, high-quality plastic bellows and specially treated metal bellows 31 perform better in aging resistance and can be selected according to the appropriate environment.

[0032] Strength and rigidity: Although the bellows 31 needs to be flexible, it must also have sufficient strength and rigidity to withstand the pressure of the medium inside the pipe and the pressure of the external soil. For buried pipes, the pressure of the soil may increase with the increase of depth. Therefore, the wall thickness and material strength of the bellows 31 should be able to meet the use requirements under different burial depths. The wall thickness of the bellows 31 can be 1cm-4cm to prevent the pipe from being flattened or broken.

[0033] Sealing: Good sealing performance is the key to ensure the normal operation of the pipe system. The connection between the bellows 31 and the pipe body should be designed with a sealing structure to ensure reliable sealing and prevent groundwater from penetrating into the pipe body and the medium in the pipe body from leaking into the soil. Common sealing methods include the use of rubber sealing rings, sealants, etc. At the same time, the structure of the bellows 31 itself should help enhance the sealing effect, such as using a double-layer sealing structure or a special sealing corrugated design.

[0034] Pipe diameter matching: The inner diameter and outer diameter of the bellows 31 should be precisely matched with the two connected pipes to ensure a tight connection without leakage. Generally, the inner diameter of the bellows 31 is required to be slightly larger than the outer diameter of the pipe so that it can be smoothly inserted into the pipe. At the same time, the gap between the two should not be too large, usually between 2-7 mm, so that the sealing material can be used for effective sealing.

[0035] Length selection: The length of the bellows 31 should be determined according to factors such as the connection method of the pipe body, the installation position, and the expansion compensation requirements. Generally speaking, in order to ensure a good expansion compensation effect, the length of the bellows 31 should not be less than 1.4-2 times the maximum displacement that the pipe body may produce. At the same time, under the premise of meeting the expansion requirements, the length of the bellows 31 should be shortened as much as possible to reduce sealing points and reduce costs.

[0036] The steel nails 51 are driven into the ground, which can improve the side support effect of the No. 1 pipe body 1 and the No. 2 pipe body 2, effectively resist the pressure from the soil, and ensure the firmness of the No. 1 pipe body 1 and the No. 2 pipe body 2.

[0037] refer to Figure 2 and Figure 3 , the outer surfaces of the ends of the No. 1 pipe body 1 and the No. 2 pipe body 2 that are close to each other are respectively provided with forward threads 6 and reverse threads 7 for installing the bellows 31. Both ends of the bellows 31 are integrally provided with collars 33, and the inner wall of each collar 33 is provided with internal threads 34 for threaded connection with the ends of the No. 1 pipe body 1 and the No. 2 pipe body 2 that are close to each other, and the internal threads 34 and the forward threads 6 and the reverse threads 7 cooperate with each other. The two collars 33 are screwed forward and backward through the forward threads 6 and the reverse threads 7 to prevent the bellows 31 from twisting when installed;

[0038] refer to Figure 2 and Figure 7 A retaining ring 8 is integrally provided on the outer surface of one end of the No. 1 pipe body 1 and the No. 2 pipe body 2 that are close to each other, and an annular groove 36 is opened inside the outer side of each ring 33. A sealing ring 37 is fixed in the annular groove 36, and the outer side of the sealing ring 37 is pressed against the retaining ring 8 to increase the sealing performance of the bellows 31 to prevent water from entering the No. 1 pipe body 1 and the No. 2 pipe body 2.

[0039] refer to Figure 4 A No. 1 sponge block 32 is fixed to the inner wall of the bellows 31 by glue. Several No. 1 sponge blocks 32 are arranged in a ring around the center of the bellows 31. Each bellows 31 is arranged in an arc shape. Each bellows 31 is provided with an air hole 35, which can reduce the wear of the cable body 4 in the No. 1 tube body 1 and the No. 2 tube body 2 by the bellows 31.

[0040] refer to Figure 1 and Figure 5 , Figure 6, both sides of the No. 1 tube body 1 and the No. 2 tube body 2 are integrally provided with ear blocks 55, and each ear block 55 is penetrated by a steel nail 51. The outer surface of the lower half of each steel nail 51 can be folded to provide a connecting rod 54, and the outer surface of the steel nail 51 is provided with a bar groove for accommodating the connecting rod 54. The connecting rod 54 and the inner wall of the bar groove are rotatably connected by a pin rod, so that the connecting rod 54 can be folded into the bar groove. The outer surface of the steel nail 51 is provided, and the connecting rod 54 is inclined. The outer sleeve of the steel nail 51 is provided with a mounting block 56, and the lower surface of the mounting block 56 is rotatably arranged with the upper surface of the ear block 55. The composition and performance of the steel nail 51 and the connecting rod 54: The steel nail 51 can be stainless steel, which is an alloy material with good corrosion resistance, and its main components include iron, chromium, nickel and other elements. The content of chromium is generally above 12%, which can form a dense chromium oxide film on the surface of the steel nail 51. This oxide film can prevent oxygen and moisture from contacting the metal inside the steel nail 51, thereby greatly improving the corrosion resistance of the steel nail 51. According to different alloy components and performance characteristics, stainless steel can be divided into multiple series, such as austenitic stainless steel (300 series), martensitic stainless steel (400 series) and ferritic stainless steel, which can be selected according to the environment;

[0041] refer to Figure 2 and Figure 6 , one end of each mounting block 56 away from the ear block 55 is welded to one end of the arc plate 52, and a gap is provided between the head and tail ends of the two arc plates 52 for the two arc plates 52 to rotate when the two arc plates 52 are displaced by the No. 1 tube body 1 and the No. 2 tube body 2. The inner wall of each ear block 55 is riveted with a No. 2 sponge block 53, which is arranged in an arc shape. The No. 2 sponge block 53 is located between the No. 1 tube body 1 and the steel nail 51 or the No. 2 tube body 2 and the steel nail 51, and the inner wall of the No. 2 sponge block 53 is pressed against both sides of the No. 1 tube body 1 and the No. 2 tube body 2 respectively. The No. 2 sponge block 53 can buffer the steel nail 51 when the steel nail 51 is squeezed, so as to prevent the steel nail 51 from causing rigid damage to the sides of the No. 1 tube body 1 and the No. 2 tube body 2;

[0042] Working principle: Before using the device, place one end of the No. 1 pipe body 1 and the No. 2 pipe body 2 close to each other in the ground cable trough, then place the anti-bending piece 3 between the No. 1 pipe body 1 and the No. 2 pipe body 2, respectively twist the two rings 33 forwards and backwards to thread and fix them with the ends of the No. 1 pipe body 1 and the No. 2 pipe body 2 close to each other, and the corrugated tube 31 will be between the No. 1 pipe body 1 and the No. 2 pipe body 2. The corrugated tube 31 has a certain bending buffer flexibility, and can bend and deform to a certain extent with the settlement of the soil to cope with the relative displacement difference between the No. 1 pipe body 1 and the No. 2 pipe body 2, thereby avoiding stress concentration and damage to the No. 1 pipe body 1 and the No. 2 pipe body 2 caused by soil settlement, ensuring the safety of the power cable, and providing convenience for the replacement and maintenance of the No. 1 pipe body 1 and the No. 2 pipe body 2;

[0043] After the bellows 31 docks the No. 1 pipe body 1 and the No. 2 pipe body 2, the connecting rod 54 on the periphery of the steel nail 51 can be folded into the steel nail 51, and then the two arc plates 52 are placed on the upper surface of the ear block 55, and the lower surface of the mounting block 56 is pressed against the upper surface of the ear block 55, and then the lower end of the steel nail 51 passes through the mounting block 56 and the ear block 55. The two arc plates 52 wrap the periphery of the bellows 31, which can protect the bellows 31, resist the pressure of the soil on the bellows 31, and prevent the bellows 31 from being damaged;

[0044] After the lower end of the steel nail 51 passes through the mounting block 56 and the ear block 55, the connecting rod 54 can be pulled outward to expand, and then the steel nail 51 and the connecting rod 54 are nailed into the ground, and a triangular stable structure is formed between the steel nail 51 and the expanded connecting rod 54, which greatly enhances the lateral support effect on the No. 1 pipe body 1 and the No. 2 pipe body 2, effectively resists the soil pressure from different directions, and improves the firmness of the No. 1 pipe body 1 and the No. 2 pipe body 2.

[0045] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any slight modification, equivalent substitution and improvement made to the above embodiment based on the technical essence of the present invention should be included in the protection scope of the technical solution of the present invention.

Claims

1. A CPVC power cable protection tube provided with a docking mechanism, comprising a first tube body (1) and a second tube body (2), characterized in that: An anti-bending member (3) is provided between the first tube body (1) and the second tube body (2), and an anti-pressure member (5) is also provided on the periphery of the first tube body (1) and the second tube body (2); The anti-bending member (3) is composed of a bellows (31), and the bellows (31) is arranged between the first pipe body (1) and the second pipe body (2); The pressure-resistant member (5) comprises a steel nail (51) and an arc-shaped plate (52), wherein the arc-shaped plate (52) is arranged on the periphery of the corrugated tube (31), and the steel nail (51) is arranged on both sides of the first tube body (1) and the second tube body (2).

2. The CPVC power cable protection tube provided with a docking mechanism according to claim 1, characterized in that: The outer surfaces of the ends of the first pipe body (1) and the second pipe body (2) close to each other are respectively provided with a forward thread (6) and a reverse thread (7) for installing a corrugated pipe (31).

3. The CPVC power cable protection tube provided with a docking mechanism according to claim 2, characterized in that: Both ends of the bellows (31) are integrally provided with collars (33), and the inner wall of each collar (33) is provided with an internal thread (34) for threaded connection with one end of the first pipe body (1) and the second pipe body (2) close to each other, and the internal thread (34) and the forward thread (6) and the reverse thread (7) cooperate with each other.

4. The CPVC power cable protection tube provided with a docking mechanism according to claim 3 is characterized in that: A retaining ring (8) is integrally provided on the outer surface of one end of the first tube body (1) and the second tube body (2) that are close to each other, and an annular groove (36) is provided inside the outer side of each of the sleeve rings (33). A sealing ring (37) is fixed inside the annular groove (36), and the outer side of the sealing ring (37) and the retaining ring (8) are pressed against each other.

5. The CPVC power cable protection tube provided with a docking mechanism according to claim 2, characterized in that: A No. 1 sponge block (32) is fixed to the inner wall of the bellows (31) by glue, and a plurality of No. 1 sponge blocks (32) are arranged in a ring shape with the center of the bellows (31). Each of the bellows (31) is arranged in an arc shape, and each of the bellows (31) is provided with an air hole (35).

6. The CPVC power cable protection tube provided with a docking mechanism according to claim 1, characterized in that: Ear blocks (55) are integrally provided on both sides of the first tube body (1) and the second tube body (2), and a steel nail (51) passes through each ear block (55).

7. The CPVC power cable protection tube provided with a docking mechanism according to claim 6, characterized in that: The outer surface of the lower half of each steel nail (51) can be folded to be provided with a connecting rod (54), and the connecting rod (54) is arranged in an inclined manner. The outer periphery of the steel nail (51) is provided with a mounting block (56), and the lower surface of the mounting block (56) is rotatably arranged with the upper surface of the ear block (55).

8. The CPVC power cable protection tube provided with a docking mechanism according to claim 7, characterized in that: One end of each of the mounting blocks (56) away from the ear block (55) is welded to one end of the arc-shaped plate (52), and a gap is provided between the head and tail ends of the two arc-shaped plates (52).

9. The CPVC power cable protection tube provided with a docking mechanism according to claim 7, characterized in that: The inner wall of each ear block (55) is riveted with a second sponge block (53), the second sponge block (53) is arranged in an arc shape, and the second sponge block (53) is located between the first tube body (1) and the steel nail (51) or the second tube body (2) and the steel nail (51), and the inner wall of the second sponge block (53) is respectively pressed against both sides of the first tube body (1) and the second tube body (2).

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