Cable for underground detection

Abstract

The utility model relates to a cable for underground detection, and belongs to the field of power cables, the cable comprises a tensile structure, a conductor, an insulating layer and a shielding layer which wrap the conductor in sequence, and a sheath used for sleeving the conductor, the tensile structure comprises a tensile layer formed by twisting a plurality of strands of steel wires, and a buffer layer and a protective layer which wrap the tensile layer in sequence from inside to outside, a positioning strip is arranged on the outer wall of the buffer layer, a positioning groove is formed in the inner wall of the protective layer, the positioning strip is embedded in the positioning groove, a plurality of buffer blocks are arranged on the outer wall of the buffer layer and abut against the inner wall of the protective layer, and the conductor is formed by twisting tinned copper wires. The tensile layer can improve the bending resistance and tensile performance, reduces the phenomenon of cable core fracture caused by low tensile strength, enables the cable to maintain excellent electrical performance in the operation process, and prolongs the service life of the cable.

Description

Technical Field

[0001] The present application relates to the field of power cables, and in particular to a cable for underground detection. Background Art

[0002] Downhole cables are an important part of maintaining the normal operation of power and control equipment. The safety of their operating status is directly related to the safety and economy of the entire power system. In actual use, domestic cables used for downhole detection are used as connecting wires between the ground system and underground instruments to hang weights and transmit measurement data. However, the existing cables have poor tensile strength and are prone to breakage, which greatly affects downhole operations. Utility Model Content

[0003] In order to improve the problem of poor tensile strength of the cable, the present application provides a cable for underground detection.

[0004] The present application provides a downhole detection cable using the following technical solution:

[0005] A cable for underground detection comprises a tensile structure, a conductor, an insulating layer and a shielding layer sequentially wrapped around the conductor, and a sheath for sheathing the conductor, the tensile structure comprising a tensile layer formed by twisting a plurality of steel wires, a buffer layer and a protective layer sequentially wrapped around the outside of the tensile layer from the inside to the outside, a positioning strip is provided on the outer wall of the buffer layer, a positioning groove is provided on the inner wall of the protective layer, the positioning strip is embedded in the positioning groove, a plurality of buffer blocks are provided on the outer wall of the buffer layer, the buffer blocks abut against the inner wall of the protective layer, and the conductor is formed by twisting tinned copper wires.

[0006] By adopting the above technical solution, the tensile layer can improve the bending resistance and tensile resistance, reduce the phenomenon of wire core breakage due to low tensile strength, enable the cable to maintain excellent electrical performance during operation, and improve the service life of the cable. When the buffer layer and protective layer need to be installed, the buffer layer is moved so that the buffer layer drives the movement of the positioning bar, so that the positioning bar is embedded in the positioning groove, and the positioning groove can limit the positioning bar, thereby limiting the buffer layer, and the buffer block can reduce the force on the buffer layer, thereby reducing the possibility of damage to the buffer layer due to bending force or tension, and further improving the tensile resistance of the cable.

[0007] Preferably, the sheath includes a wrapping layer and an outer protective layer, the wrapping layer adopts a cotton tape wrapping structure, the outer protective layer is sleeved on the wrapping layer, the outer protective layer is a polytetrafluoroethylene layer, a mounting strip is provided on the outer wall of the protective layer, the mounting strip is connected to the wrapping layer on a side away from the protective layer, a mounting arc surface is provided on the mounting strip, and the mounting arc surface is in contact with the shielding layer.

[0008] By adopting the above technical solution, the wrapping layer adopts a cotton tape wrapping structure, and the wrapping overlap rate is high; the polytetrafluoroethylene layer is not only mechanically soft, but also resistant to high and low temperatures and corrosion, and plays a protective role. Through the setting of the installation strip, the installation strip can facilitate the installation of the conductor, so that the installation arc surface and the shielding layer fit together, and the installation arc surface can limit the shielding layer, thereby limiting the conductor, and improving the stability of the conductor after installation.

[0009] Preferably, a support hole is opened in the mounting bar, a support bar is provided in the mounting bar, the support bar is embedded in the support hole, and the support bar abuts against the hole wall of the support hole.

[0010] By adopting the above technical solution, the support bar can be placed in the support hole, and the support bar abuts against the hole wall of the support hole. The support bar can support the hole wall of the control hole, thereby supporting the installation bar, improving the structural strength of the installation bar, and thus improving the structural strength of the cable.

[0011] Preferably, a reinforcement hole is opened in the mounting strip, a reinforcement rod is arranged in the mounting strip, the reinforcement hole is for the reinforcement rod to be embedded, a plurality of protrusions are fixedly connected to the reinforcement rod, and the protrusions abut against the hole wall of the reinforcement hole.

[0012] By adopting the above technical solution, the reinforcing rod can be placed in the reinforcing hole, and the protrusion abuts against the hole wall of the reinforcing hole, and the protrusion can exert a force on the hole wall of the reinforcing hole, so that the installation bar exerts a force on the shielding layer, further improving the stability of the conductor after installation.

[0013] Preferably, the insulating layer is a cross-linked polyethylene layer.

[0014] By adopting the above technical solution, cross-linked polyethylene is a modified polyethylene material with excellent heat resistance, mechanical strength and electrical properties, and can withstand changes in higher voltages and charge properties.

[0015] Preferably, the shielding layer is a bare copper wire braided layer.

[0016] By adopting the above technical solution, the bare copper wire braided layer has good conductivity and electromagnetic shielding performance, which can guide external electromagnetic interference to the ground wire, so that the signal passing through the signal line is not disturbed.

[0017] Preferably, the buffer layer is a silicone rubber layer.

[0018] By adopting the above technical solution, the silicone rubber layer is resistant to high and low temperatures, and also has the functions of corrosion resistance, moisture resistance and flame resistance, thereby increasing the service life of the buffer layer.

[0019] Preferably, the protective layer is a polyethylene layer.

[0020] By adopting the above technical solution, the polyethylene layer has good corrosion resistance, insulation performance and wear resistance, is not easily scratched, and can resist erosion by corrosive media such as chemicals, acids and alkalis.

[0021] In summary, the present application includes at least one of the following beneficial technical effects:

[0022] 1. Through the setting of the tensile layer, positioning groove, positioning strip and buffer block, the tensile layer can improve the bending resistance and tensile resistance, reduce the phenomenon of wire core breakage due to low tensile strength, so that the cable maintains excellent electrical performance during operation and improves the service life of the cable. When the buffer layer and protective layer need to be installed, the buffer layer is moved so that the buffer layer drives the movement of the positioning strip, so that the positioning strip is embedded in the positioning groove. The positioning groove can limit the positioning strip, thereby limiting the buffer layer, and the buffer block can reduce the force on the buffer layer, thereby reducing the possibility of damage to the buffer layer due to bending force or tension, further improving the tensile resistance of the cable;

[0023] 2. Through the setting of the support hole and the support bar, the support bar can be placed in the support hole, and the support bar abuts against the hole wall of the support hole. The support bar can support the hole wall of the control hole, thereby supporting the installation bar, improving the structural strength of the installation bar, thereby improving the structural strength of the cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the cross-sectional structure of the cable for downhole detection in the embodiment of the present application.

[0025] Explanation of the accompanying drawings: 1. Tensile structure; 11. Tensile layer; 12. Buffer layer; 121. Positioning strip; 122. Buffer block; 13. Protective layer; 131. Positioning groove; 2. Conductor; 21. Insulating layer; 22. Shielding layer; 3. Sheath; 31. Wrapping layer; 32. Outer protective layer; 4. Mounting strip; 41. Mounting arc surface; 42. Support hole; 43. Support strip; 44. Reinforcement hole; 45. Reinforcement rod. DETAILED DESCRIPTION

[0026] The following is combined with Figure 1 This application is described in further detail.

[0027] The present application embodiment discloses a downhole detection cable, such as Figure 1As shown, it includes a tensile structure 1, a conductor 2, an insulating layer 21 and a shielding layer 22 sequentially wrapped around the conductor 2, and a sheath 3 for covering the conductor 2. The tensile structure 1 includes a tensile layer 11 formed by twisting multiple strands of steel wires, a buffer layer 12 and a protective layer 13 sequentially wrapped around the outside of the tensile layer 11 from the inside to the outside. The tensile layer 11 can improve the bending resistance and tensile resistance, reduce the phenomenon of core breakage caused by low tensile strength, so that the cable maintains excellent electrical performance during operation and improves the service life of the cable.

[0028] like Figure 1 As shown, a positioning strip 121 is provided on the outer wall of the buffer layer 12. In this embodiment, the number of the positioning strips 121 is four. A positioning groove 131 is provided on the inner wall of the protective layer 13 for the positioning strip 121 to be embedded. The positioning groove 131 can limit the positioning strip 121, thereby limiting the buffer layer 12. A plurality of buffer blocks 122 are provided on the outer wall of the buffer layer 12, and the buffer blocks 122 abut against the inner wall of the protective layer 13. When the buffer layer 12 and the protective layer 13 need to be installed, the buffer layer 12 is moved so that the buffer layer 12 drives the positioning strip 121 to move, so that the positioning strip 121 is embedded in the positioning groove 131. The positioning groove 131 can limit the buffer layer 12, thereby positioning the buffer layer 12 and the protective layer 13. After that, the buffer layer 12 is sleeved on the tensile layer 11, and the installation of the protective layer 13 is also completed. The buffer block 122 can reduce the force acting on the buffer layer 12, thereby reducing the possibility of damage to the buffer layer 12 due to the force, and improving the tensile strength of the cable.

[0029] like Figure 1 As shown, the buffer layer 12 is a silicone rubber layer, which is resistant to high and low temperatures, corrosion, moisture and flame, and improves the service life of the buffer layer 12. The protective layer 13 is a polyethylene layer, which has good corrosion resistance, insulation and wear resistance, is not easily scratched, and can resist erosion by corrosive media such as chemicals, acids and alkalis.

[0030] like Figure 1 As shown, the conductor 2 is made of tinned copper wires twisted together, which has a stable structure and further improves the tensile strength of the cable. The insulating layer 21 is a cross-linked polyethylene layer. Cross-linked polyethylene is a modified polyethylene material with good heat resistance, mechanical strength and electrical properties, and can withstand high voltages and changes in charge properties. The shielding layer 22 is a bare copper wire braided layer. The bare copper wire braided layer has good conductivity and electromagnetic shielding performance, and can guide external electromagnetic interference to the ground wire, so that the signal passing through the signal line is not interfered with.

[0031] like Figure 1As shown, the sheath 3 includes a wrapping layer 31 and an outer sheath 32. The wrapping layer 31 adopts a cotton tape wrapping structure with a high wrapping overlap rate. The outer sheath 32 is sleeved on the wrapping layer 31. The outer sheath 32 is a polytetrafluoroethylene layer. The polytetrafluoroethylene layer is not only mechanically soft, but also resistant to high and low temperatures and corrosion, and plays a protective role.

[0032] like Figure 1 As shown, a plurality of mounting bars 4 are fixedly connected to the outer wall of the protective layer 13. The side of the mounting bar 4 away from the protective layer 13 is fixedly connected to the wrapping layer 31. The mounting bar 4 is provided with a mounting arc surface 41. The mounting arc surface 41 is in contact with the shielding layer 22. The mounting arc surface 41 can limit the shielding layer 22, thereby limiting the conductor 2. A support hole 42 is provided in the mounting bar 4. A support bar 43 is provided in the mounting bar 4. The support hole 42 is for the support bar 43 to be embedded. Four reinforcement holes 44 are provided in one mounting bar 4. A reinforcement rod 45 is provided in the mounting bar 4. The reinforcement hole 44 is for the reinforcement rod 45 to be embedded. A plurality of protrusions are fixedly connected to the reinforcement rod 45. The protrusions abut against the hole wall of the reinforcement hole 44. When installing the conductor 2, the conductor 2 is moved so that the conductor 2 drives the shielding layer 22 to move so that the shielding layer 22 moves to be in contact with the mounting arc surface 41. The mounting arc surface 41 can limit the shielding layer 22, thereby limiting the conductor 2, thereby achieving the installation of the conductor 2. Afterwards, the support bar 43 is embedded in the support hole 42, and the reinforcement rod 45 is embedded in the reinforcement hole 44. The support hole 42 can exert a force on the hole wall of the support hole 42, thereby playing a supporting role, reducing the possibility of bending of the mounting bar 4 under force, and improving the structural strength of the mounting bar 4; when the reinforcement rod 45 is embedded in the reinforcement hole 44, the protrusion is connected to the hole wall of the reinforcement hole 44, thereby exerting a force on the hole wall of the reinforcement hole 44, making it easier for the mounting bar 4 to exert a force on the shielding layer 22, thereby improving the stability of the conductor 2 after installation.

[0033] The implementation principle of a downhole detection cable in the embodiment of the present application is:

[0034] The operator puts the buffer layer 12 into the protective layer 13, and the positioning bar 121 is embedded in the positioning groove 131, so that the two are fixed, and then the buffer layer 12 is sleeved on the tensile layer 11, and the protective layer 13 is also installed. The protective layer 13 can drive the movement of the wrapping layer 31 through the installation bar 4, so as to achieve the installation of the sheath 3, and then move the conductor 2 so that the conductor 2 drives the movement of the shielding layer 22, so that the shielding layer 22 moves to fit the installation arc surface 41, so as to achieve the installation of the conductor 2, and finally the support bar 43 is embedded in the support hole 42, and the reinforcing rod 45 is embedded in the reinforcing hole 44, so as to achieve the overall installation of the cable.

[0035] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A cable for downhole detection, characterized in that: The invention comprises a tensile structure (1), a conductor (2), an insulating layer (21) and a shielding layer (22) which are sequentially wrapped around the conductor (2), and a sheath (3) for sheathing the conductor (2); the tensile structure (1) comprises a tensile layer (11) formed by twisting a plurality of steel wires, a buffer layer (12) and a protective layer (13) which are sequentially wrapped around the outside of the tensile layer (11) from the inside to the outside; a positioning strip (121) is provided on the outer wall of the buffer layer (12); a positioning groove (131) is provided on the inner wall of the protective layer (13); the positioning strip (121) is embedded in the positioning groove (131); a plurality of buffer blocks (122) are provided on the outer wall of the buffer layer (12); the buffer blocks (122) and the inner wall of the protective layer (13) are in contact with each other; and the conductor (2) is formed by twisting tinned copper wires.

2. A downhole detection cable according to claim 1, characterized in that: The sheath (3) comprises a wrapping layer (31) and an outer sheath (32); the wrapping layer (31) adopts a cotton tape wrapping structure; the outer sheath (32) is sleeved on the wrapping layer (31); the outer sheath (32) is a polytetrafluoroethylene layer; a mounting strip (4) is provided on the outer wall of the protective layer (13); a side of the mounting strip (4) away from the protective layer (13) is connected to the wrapping layer (31); a mounting arc surface (41) is provided on the mounting strip (4); the mounting arc surface (41) is in contact with the shielding layer (22).

3. A downhole detection cable according to claim 2, characterized in that: A support hole (42) is provided in the installation strip (4), a support strip (43) is provided in the installation strip (4), the support strip (43) is embedded in the support hole (42), and the support strip (43) abuts against the hole wall of the support hole (42).

4. A downhole detection cable according to claim 3, characterized in that: A reinforcement hole (44) is provided in the installation bar (4), a reinforcement rod (45) is provided in the installation bar (4), the reinforcement hole (44) is for the reinforcement rod (45) to be inserted, a plurality of protrusions are fixedly connected to the reinforcement rod (45), and the protrusions abut against the hole wall of the reinforcement hole (44).

5. The downhole detection cable according to claim 1, characterized in that: The insulating layer (21) is a cross-linked polyethylene layer.

6. A downhole detection cable according to claim 1, characterized in that: The shielding layer (22) is a bare copper wire braided layer.

7. A downhole detection cable according to claim 1, characterized in that: The buffer layer (12) is a silicone rubber layer.

8. The downhole detection cable according to claim 1, characterized in that: The protective layer (13) is a polyethylene layer.

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