Cross-linked polyethylene insulated high anti-interference frequency conversion cable
By setting up a three-layer stacked isolation sleeve structure between the composite shielding layer and the armored layer of the frequency converter cable, the problem of damage to the isolation sleeve under extrusion and friction is solved, and the anti-interference performance and service life of the cable are improved.
Patent Information
- Application Number
- CN202420596090.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-26
- Publication Date
- 2025-04-08
- Estimated Expiration
- 2034-03-26
AI Technical Summary
During the use of existing frequency converter cables, due to the mutual extrusion and friction between the steel wire armor layer and the shielding layer, the isolation sleeve is prone to damage and failure.
A three-layer laminated isolation sleeve structure is arranged between the composite shielding layer and the armor layer, including two wear-resistant layers and one buffer layer. The buffer layer is made of silicone rubber, the wear-resistant layer is made of polyurethane rubber, and the outer wall of the wear-resistant layer is covered with a lubricating layer.
It improves the service life and radial compression ability of the isolation sleeve, reduces the wear of the shielding layer and armored layer on the isolation sleeve, and ensures the high anti-interference performance and durability of the cable.
Smart Images
Figure CN222734705U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of cables, in particular to a cross-linked polyethylene insulated high-interference-resistant frequency conversion cable. Background Art
[0002] Frequency conversion cables are mainly used as cables for connecting frequency conversion power supplies and frequency conversion motors, as well as for transmitting electric energy in power transmission and distribution lines with a rated voltage of 1KV and below. The structure of frequency conversion cables includes three main insulated wires and three neutral insulated wires, forming a 3+3 core structure, which makes the cable have strong voltage impact resistance and can withstand the pulse voltage during high-speed and frequent frequency conversion, thus playing a good protective role for frequency conversion electrical appliances.
[0003] In order to make the frequency conversion cable have anti-interference performance, a shielding structure is set inside the cable. According to different requirements, the types of shielding structures include: copper tape shielding, copper tape shielding + copper wire braided double shielding, copper tape shielding + tinned copper wire braided double shielding, etc. Considering that the cable is often subjected to radial external force during use, a steel wire armor layer is added outside the cable shielding layer to increase the radial compressive resistance of the cable.
[0004] At the same time, in order to avoid accelerated oxidation of copper due to different metal activities, an isolation sleeve is set between the steel wire armor layer and the shielding layer to separate the steel wire armor layer from the shielding layer. At present, the isolation sleeve can only achieve the isolation effect. However, due to the bending and torsion of the cable, the steel wire armor layer and the shielding layer will not only be squeezed against each other, but also rubbed against each other. The isolation sleeve is easily damaged and failed under the action of squeezing force and friction. Utility Model Content
[0005] In view of the technical problems existing in the frequency conversion cable in the prior art, the first aspect of the utility model proposes a cross-linked polyethylene insulated high anti-interference type frequency conversion cable, comprising:
[0006] The cable core comprises a plurality of main lines and a plurality of neutral lines, wherein the plurality of main lines are arranged tangentially to each other in pairs, and the plurality of neutral lines are respectively located in the slits formed by the plurality of main lines, and a filling layer is provided in the gap between the main lines and the neutral lines, and is wrapped by a polyurethane wrapping layer to form a cable core;
[0007] A composite shielding layer, which adopts a composite shielding of copper tape wrapping shielding and copper wire braiding shielding, is coated on the outside of the cable core and is used for electromagnetic shielding of the cable core;
[0008] The armor layer is made of steel wire wrapped armor and is covered on the outside of the composite shielding layer;
[0009] An outer sheath, extruded and wrapped around the outer side of the armor layer;
[0010] Among them, an isolation sleeve is provided between the composite shielding layer and the armor layer. The isolation sleeve is constructed to consist of two outer wear-resistant layers and a buffer layer sandwiched between the two wear-resistant layers, forming a three-layer laminated isolation sleeve structure, so that the isolation sleeve can be elastically compressed in the radial direction and provide a buffer space for the extrusion of the composite shielding layer and the armor layer.
[0011] Preferably, the buffer layer is made of silicone rubber.
[0012] Preferably, the wall thickness of the buffer layer is 2.5-3.5 mm.
[0013] Preferably, the wear-resistant layer is made of polyurethane rubber.
[0014] Preferably, the outer wall of the wear-resistant layer located on the outside is covered with a lubricating layer.
[0015] Preferably, the cable core includes multiple main lines and multiple neutral lines, the multiple main lines are arranged tangentially in pairs, the multiple neutral lines are respectively located in the slits formed by the multiple main lines, a filling layer is provided in the gap between the main lines and the neutral lines, and is wrapped with a wrapping layer to form a circular cross-section.
[0016] Preferably, the main line includes a first conductor and a first insulating shielding layer, the first conductor is formed by twisting a plurality of copper wires and being extruded and solidified by the first insulating shielding layer to form a circular cross-section, and the plurality of main lines are distributed in an equilateral triangle.
[0017] The neutral line includes a second conductor and a second insulating shielding layer, wherein the second conductor is formed by twisting a plurality of copper wires and being extruded and solidified by the second insulating shielding layer to form a circular cross section. The plurality of neutral lines are distributed in the shape of an inverted equilateral triangle.
[0018] Wherein, the first insulating shielding layer and the second insulating shielding layer are both cross-linked polyethylene insulation.
[0019] Preferably, the filling layer is a water-blocking yarn filling layer.
[0020] Preferably, the wrapping layer is a phlogopite tape wrapping layer.
[0021] Compared with the prior art, the cross-linked polyethylene insulated high anti-interference frequency conversion cable of the utility model has the following significant advantages:
[0022] An isolation sleeve is provided between the composite shielding layer and the armor layer, and the isolation sleeve is configured as a three-layer structure in which two wear-resistant layers sandwich a buffer layer. The two wear-resistant layers are configured so that the two sides of the isolation sleeve in contact with the composite shielding layer and the armor layer have good wear resistance, thereby reducing the wear of the composite shielding layer and the armor layer on the isolation sleeve. While the composite shielding layer and the armor layer ensure high anti-interference performance, the service life of the isolation sleeve is improved. The configuration of the buffer layer enables the isolation sleeve to be elastically compressed in the radial direction, thereby providing a buffer space for the mutual extrusion of the composite shielding layer and the armor layer, thereby improving the radial pressure bearing capacity of the isolation sleeve. BRIEF DESCRIPTION OF THE DRAWINGS
[0023] Figure 1 The utility model is a schematic diagram of the structure of a cross-linked polyethylene insulated high-interference-resistant frequency conversion cable.
[0024] Figure 2 The utility model is a schematic diagram of the structure of an isolation sleeve in a cross-linked polyethylene insulated high-interference-resistant frequency conversion cable.
[0025] Figure 3 The utility model is a schematic diagram of the structure of the main line of the cross-linked polyethylene insulated high anti-interference type frequency conversion cable.
[0026] Figure 4 The utility model is a schematic diagram of the structure of the neutral line in the cross-linked polyethylene insulated high anti-interference type frequency conversion cable.
[0027] The meanings of the reference numerals in the figure are as follows: 10, main line; 11, first conductor; 12, first insulating shielding layer; 20, neutral line; 21, second conductor; 22, second insulating shielding layer; 30, filling layer; 40, wrapping layer; 50, composite shielding layer; 60, isolation sleeve; 61, buffer layer; 62, wear-resistant layer; 63, lubricating layer; 70, armor layer; 80, outer sheath. DETAILED DESCRIPTION
[0028] In order to better understand the technical content of the present invention, specific embodiments are described below in conjunction with the accompanying drawings.
[0029] Combination Figure 1-Figure 4 As shown, the cross-linked polyethylene insulated high anti-interference variable frequency cable provided by the utility model includes a cable core, a composite shielding layer 50, an isolation sleeve 60, an armor layer 70 and an outer sheath 80. The composite shielding layer 50 is coated on the outside of the cable core for electromagnetic shielding of the cable core. The armor layer 70 is coated on the outside of the composite shielding layer 50 for increasing the radial compressive resistance of the cable. The outer sheath 80 is extruded on the outer side of the armor layer 70.
[0030] In the example of the utility model, the composite shielding layer 50 of the frequency conversion cable adopts a composite shielding of copper tape wrapped shielding and copper wire braided shielding, and the armor layer 70 adopts fine steel wire wrapped shielding, which plays an additional overall shielding role while bearing radial pressure. By adopting two different shielding materials, they play a complementary role in electromagnetic wave shielding, thereby improving the composite shielding effect.
[0031] In the example of the utility model, due to the different metal activities of the copper shielding layer and the steel wire, in order to reduce the accelerated oxidation of copper due to the different metal activities, an isolation sleeve is provided between the steel wire armor layer and the shielding layer to separate the steel wire armor layer from the shielding layer, thereby increasing the service life of the cable.
[0032] However, due to the influence of cable bending and twisting, during the use of the cable, the steel wire armor layer and the shielding layer are squeezed and rubbed against each other, and the isolation sleeve is easily damaged and failed under the action of squeezing force and friction. Figure 1 and Figure 2 In the example shown, in the embodiment of the present invention, a multi-layer laminated elastic isolation sleeve 60 is arranged between the composite shielding layer 50 and the armor layer 70 to play a buffering and isolating role.
[0033] In an optional example, the isolation sleeve 60 is constructed to consist of two outer wear-resistant layers 62 and a buffer layer 61 sandwiched between the two wear-resistant layers, forming a three-layer laminated isolation sleeve structure, so that the isolation sleeve can be elastically compressed in the radial direction and provide a buffer space for the extrusion of the composite shielding layer and the armor layer.
[0034] In this way, the setting of the two wear-resistant layers 62 makes the two sides of the isolation sleeve 60 that contact the composite shielding layer 50 and the armor layer 70 have good wear resistance, reduces the wear of the composite shielding layer 50 and the armor layer 70 on the isolation sleeve 60, and improves the service life of the isolation sleeve 60. The setting of the buffer layer 61 enables the isolation sleeve 60 to be elastically compressed in the radial direction, provides a buffer space for the mutual extrusion of the composite shielding layer 50 and the armor layer 70, and improves the radial pressure-bearing capacity of the isolation sleeve 60.
[0035] In an optional embodiment, the material of the buffer layer 61 is silicone rubber, and the material of the wear-resistant layer 62 is polyurethane rubber. Due to the good softness of silicone, it can provide a larger compression buffer distance when squeezed. The polyurethane rubber has good wear resistance and has little wear when in contact and friction with the composite shielding layer 50 and the armor layer 70.
[0036] Furthermore, the wall thickness of the buffer layer 61 is 2.5-3.5 mm, and preferably the wall thickness of the buffer layer 61 is 3.5 mm. The thicker buffer layer 61 can provide a larger buffering distance, further improving the radial pressure-bearing capacity of the isolation sleeve 60 .
[0037] Combination Figure 2 As shown, the outer wall of the wear-resistant layer 62 located on the outside is covered with a lubricating layer 63. The wear-resistant layer 62 located on the outside is in contact with the steel wire armor layer 70. The steel wire armor layer 70 has a higher hardness. When rubbing against the wear-resistant layer 62, the wear of the wear-resistant layer 62 is greater. By providing the lubricating layer 63, the friction between the steel wire armor layer 70 and the wear-resistant layer 62 can be reduced, thereby reducing wear.
[0038] In an optional embodiment, the lubricating layer 63 is a graphite coating to facilitate the sliding and wear resistance between the isolation sleeve 60 and the steel wire armor layer 70, thereby reducing the wear between the two.
[0039] Combination Figure 1 , Figure 3 and Figure 4 As shown, the cable core includes a plurality of main lines 10 and a plurality of neutral lines 20, the plurality of main lines 10 are arranged tangentially in pairs, the plurality of neutral lines 20 are respectively located in the slits formed by the plurality of main lines 10, a filling layer 30 is provided in the gap between the main lines 10 and the neutral lines 20, and is wrapped by a wrapping layer 40 to form a circular cross-section. In the example shown in the figure, a combination of three main lines and three neutral lines is taken as an example to form a 3+3 core structure, which has better transmission performance than a four-core cable.
[0040] The main line 10 includes a first conductor 11 and a first insulating shielding layer 12. The first conductor 11 is formed by twisting a plurality of copper wires and being extruded and solidified by the first insulating shielding layer 12 to form a circular cross section. The neutral line 20 includes a second conductor 21 and a second insulating shielding layer 22. The second conductor 21 is formed by twisting a plurality of copper wires and being extruded and solidified by the second insulating shielding layer 22 to form a circular cross section. The plurality of main lines are distributed in an equilateral triangle, and the plurality of neutral lines are distributed in an inverted equilateral triangle.
[0041] Furthermore, the first insulating shielding layer 12 and the second insulating shielding layer 22 are both three-layer co-extruded layers, which are sequentially coated from the inside to the outside with a conductor shielding layer, an insulating layer and an insulating shielding layer. The conductor shielding layer and the insulating shielding layer are made of semi-conductive polyolefin material, and the insulating layer is made of cross-linked polyethylene material.
[0042] In an optional embodiment, the filling layer 30 is a water-blocking yarn filling layer, which can play a water-blocking role and prevent water vapor from entering the conductor. The sheathing layer 40 is a phlogopite tape sheathing layer. The number of sheathing layers is two, and the sheathing overlap rate is greater than 50%. The phlogopite tape sheathing layer has a good flame retardant effect, thereby improving the flame retardant properties of the cable.
[0043] In combination with the above embodiments, an isolation sleeve 60 is provided between the composite shielding layer 50 and the armor layer 70, and the isolation sleeve 60 is configured as a three-layer structure of two wear-resistant layers 62 sandwiching a buffer layer 61. The setting of the two wear-resistant layers 62 makes the two sides of the isolation sleeve 60 in contact with the composite shielding layer 50 and the armor layer 70 have good wear resistance, thereby reducing the wear of the composite shielding layer 50 and the armor layer 70 on the isolation sleeve 60. While the composite shielding layer and the armor layer ensure high anti-interference performance, the service life of the isolation sleeve 60 is improved. The setting of the buffer layer 61 enables the isolation sleeve 60 to be elastically compressed in the radial direction, thereby providing a buffer space for the mutual extrusion of the composite shielding layer 50 and the armor layer 70, and improving the radial pressure bearing capacity of the isolation sleeve 60.
[0044] Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. A person with ordinary knowledge in the technical field to which the present invention belongs may make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be determined by the definition of the claims.
Claims
1. A cross-linked polyethylene insulated high anti-interference type frequency conversion cable, characterized in that: include: A cable core, comprising a plurality of main lines (10) and a plurality of neutral lines (20), wherein the plurality of main lines (10) are arranged tangentially to each other in pairs, and the plurality of neutral lines (20) are respectively located in slits formed by the plurality of main lines (10), and a filling layer (30) is provided in the gap between the main lines (10) and the neutral lines (20), and is wrapped with a polyurethane wrapping layer (40) to form a cable core; A composite shielding layer (50), which adopts a composite shielding of copper tape wrapping shielding and copper wire braiding shielding, is coated on the outside of the cable core and is used for electromagnetic shielding of the cable core; An armor layer (70) is formed by wrapping steel wires and is coated on the outside of the composite shielding layer (50); An outer sheath (80) extruded onto the outer side of the armor layer (70); An isolation sleeve (60) is provided between the composite shielding layer (50) and the armor layer (70), and the isolation sleeve (60) is constructed to be composed of two outer wear-resistant layers (62) and a buffer layer (61) sandwiched between the two wear-resistant layers (62), forming a three-layer laminated isolation sleeve structure, so that the isolation sleeve (60) can be elastically compressed in the radial direction and provide a buffer space for the extrusion of the composite shielding layer (50) and the armor layer (70).
2. The cross-linked polyethylene insulated high anti-interference type frequency conversion cable according to claim 1, characterized in that: The material of the buffer layer (61) is silicone rubber.
3. The cross-linked polyethylene insulated high anti-interference type frequency conversion cable according to claim 1, characterized in that: The buffer layer (61) has a wall thickness of 2.5-3.5 mm.
4. The cross-linked polyethylene insulated high anti-interference type frequency conversion cable according to claim 1, characterized in that: The material of the wear-resistant layer (62) is polyurethane rubber.
5. The cross-linked polyethylene insulated high anti-interference type frequency conversion cable according to claim 1, characterized in that: The outer wall of the wear-resistant layer (62) located on the outside is covered with a lubricating layer (63).
6. The cross-linked polyethylene insulated high anti-interference type frequency conversion cable according to claim 1, characterized in that: The main line (10) comprises a first conductor (11) and a first insulating shielding layer (12), the first insulating shielding layer (12) being cross-linked polyethylene insulated, the first conductor (11) being a plurality of copper wires twisted together and extruded and solidified by the first insulating shielding layer (12) to form a circular cross section, and the plurality of main lines (10) are distributed in the form of an equilateral triangle.
7. The cross-linked polyethylene insulated high anti-interference type frequency conversion cable according to claim 1, characterized in that: The neutral line (20) comprises a second conductor (21) and a second insulating shielding layer (22), the second insulating shielding layer (22) being cross-linked polyethylene insulated, the second conductor (21) being a plurality of copper wires twisted together and extruded and solidified by the second insulating shielding layer (22) to form a circular cross section, and the plurality of neutral lines (20) are distributed in the form of an inverted equilateral triangle.
8. The cross-linked polyethylene insulated high anti-interference type frequency conversion cable according to claim 1, characterized in that: The filling layer (30) is a water-blocking yarn filling layer.
9. The cross-linked polyethylene insulated high anti-interference type frequency conversion cable according to claim 1, characterized in that: The wrapping layer (40) is a phlogopite tape wrapping layer.
10. The cross-linked polyethylene insulated high anti-interference type frequency conversion cable according to claim 6, characterized in that: The first insulating shielding layer (12) and the second insulating shielding layer (22) are both three-layer co-extruded layers, which sequentially cover a conductor shielding layer, an insulating layer and an insulating shielding layer from the inside to the outside, wherein the conductor shielding layer and the insulating shielding layer are made of semi-conductive polyolefin material, and the insulating layer is made of cross-linked polyethylene material.