CN223390310U - Anti-interference variable frequency power cable - Google Patents
Anti-interference variable frequency power cableInfo
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- CN223390310U CN223390310U CN202422347388.4U CN202422347388U CN223390310U CN 223390310 U CN223390310 U CN 223390310U CN 202422347388 U CN202422347388 U CN 202422347388U CN 223390310 U CN223390310 U CN 223390310U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/14—Extreme weather resilient electric power supply systems, e.g. strengthening power lines or underground power cables
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Abstract
The utility model discloses an anti-interference variable frequency power cable, which relates to the technical field of variable frequency power cables and comprises a cable core, wherein the cable core is provided with a plurality of power wire cores and a plurality of grounding wire cores which are twisted together, flame-retardant filling ropes are filled in twisting gaps of the cable core, the power wire cores are provided with power conductors, a power insulating layer and a power shielding layer, the power insulating layer and the power shielding layer are sequentially coated outside the power conductors from inside to outside, and the grounding wire core is provided with a grounding conductor, and a grounding insulating layer and a grounding shielding layer, the grounding insulating layer and the grounding shielding layer are sequentially coated outside the grounding conductor from inside to outside. According to the utility model, the power shielding layer and the grounding shielding layer are respectively arranged for the power wire core and the grounding wire core, so that the electromagnetic interference resistance can be improved, and the stability and the reliability of signal transmission are ensured.
Description
Technical Field
The utility model relates to the technical field of variable frequency power cables, in particular to an anti-interference variable frequency power cable.
Background
The variable frequency power cable is a special cable for transmitting variable frequency power sources, and is mainly applied to a power system needing frequency adjustment, such as between a frequency converter and a motor. Because the signals output by the variable frequency power supply exist in a high-frequency pulse mode, the corresponding cable also has to have good anti-interference capability and transmission stability.
The prior art discloses a variable frequency voltage power cable applicable to high electromagnetic interference environments, high temperature environments and the like, and please refer to the technology disclosed in Chinese patent literature, wherein the technology is a novel anti-electromagnetic interference, wear-resistant, rat-proof, termite-resistant, environment-friendly variable frequency voltage power cable, the publication number of which is CN219143862U, and the publication date of which is 2023, 06 and 06. In the technology, an insulating sheath is extruded in a split-phase mode, then the insulating sheath is symmetrically cabled, and then a wrapping belt, a braided shielding layer, an inner sheath, an armor layer and an outer sheath are sequentially arranged, wherein electromagnetic shielding is carried out only by means of one layer of tin-plated copper wire braided shielding layer, and when the insulating sheath faces a complex electromagnetic environment, the insulating sheath has weak anti-interference capability on electromagnetic, so that transmission performance is low.
Disclosure of utility model
The utility model provides an anti-interference variable frequency power cable, which aims to solve the technical problem that the cable in the prior art is poor in anti-electromagnetic interference capability.
The technical scheme adopted by the utility model is as follows:
An anti-interference variable frequency power cable comprises a cable core, wherein the cable core is provided with a plurality of power wire cores and a plurality of grounding wire cores which are twisted together, and flame-retardant filling ropes are filled in twisting gaps of the cable core;
The power wire core is provided with a power conductor, and a power insulating layer and a power shielding layer which are sequentially coated outside the power conductor from inside to outside;
The grounding wire core is provided with a grounding conductor, and a grounding insulating layer and a grounding shielding layer which are sequentially coated outside the grounding conductor from inside to outside.
According to the technical measures, the power shielding layer and the grounding shielding layer are respectively arranged for the power wire core and the grounding wire core, so that the electromagnetic interference resistance can be improved, and the stability and the reliability of signal transmission are ensured.
Further, the power wire core is also provided with a power mica tape wrapping layer which is positioned at the inner side of the power insulating layer;
The power mica tape wrapping layer is an overlapped wrapping structure with the thickness of 0.15mm and the width of 15-60 mm outside the power conductor;
The power conductor is of a compound stranding structure of a plurality of tinned copper wires with the monofilament diameters of 0.1-0.5 mm;
The power insulating layer is an extrusion structure of a flame-retardant crosslinked polyethylene material outside the wrapping layer of the power mica tape, and the extrusion thickness is 0.7-1.8 mm.
The technical measures are that the fire resistance is improved by arranging the power mica tape wrapping layer on the inner side of the power insulating layer, the power conductor adopts a compound twisting structure, the softness of the power conductor is improved, and the power insulating layer is made of flame-retardant crosslinked polyethylene material and is of an extrusion wrapping structure, so that the fire resistance is improved.
Further, the power shielding layer is of a braiding structure of tinned copper wires with diameters of 0.15-0.30 mm outside the power insulating layer, and the braiding density is more than or equal to 80%.
In the technical measures, the power shielding layer adopts a tinned copper wire braided structure, the braiding density is more than or equal to 80%, and the electromagnetic interference resistance can be enhanced.
Further, the grounding wire core is also provided with a grounding mica tape wrapping layer which is positioned on the inner side of the grounding insulating layer;
The grounding mica tape wrapping layer is of an overlapped wrapping structure with the thickness of 0.15mm and the width of 15-60 mm outside the grounding conductor;
The grounding conductor is of a compound stranding structure of a plurality of tinned copper wires with the monofilament diameters of 0.1-0.5 mm;
the grounding insulating layer is an extrusion structure of a flame-retardant crosslinked polyethylene material outside the grounding mica tape wrapping layer, and the extrusion thickness is 0.7-1.0 mm.
The technical measures are that the grounding mica tape wrapping layer is arranged on the inner side of the grounding insulating layer, so that the fire resistance is improved, the grounding conductor adopts a twisted structure, the softness of the grounding conductor is improved, and the grounding insulating layer is made of flame-retardant crosslinked polyethylene material and is of an extrusion structure, so that the fire resistance is improved.
Further, the grounding shielding layer is of a braiding structure of tinned copper wires with diameters of 0.15-0.30 mm outside the grounding insulating layer, and the braiding density is more than or equal to 80%.
In the technical measures, the grounding shielding layer adopts a tinned copper wire braiding structure, the braiding density is more than or equal to 80%, and the electromagnetic interference resistance can be enhanced.
Further, the cable core is sequentially coated with a low-smoke halogen-free flame-retardant tape wrapping layer, a total shielding layer, an inner sheath layer, an armor layer and an outer sheath layer from inside to outside;
The total shielding layer is provided with a copper wire woven shielding layer on the inner side and a copper strip wrapping shielding layer on the outer side;
The copper wire braided shielding layer is a braided structure of copper wires with the diameter of 0.15-0.30 mm outside the low-smoke halogen-free flame-retardant tape wrapping layer, and the braiding density is more than or equal to 90%;
the copper strip wrapping shielding layer is of an overlapped wrapping structure that copper strips with the thickness of 0.1mm and the width of 25-50 mm are outside the copper wire braiding shielding layer.
According to the technical measure, the two shielding layers are arranged, so that the interference of external electromagnetic waves can be reduced, and meanwhile, the shielding layers are wrapped by the copper strips, so that the mechanical strength can be enhanced.
Further, the inner sheath layer is of an extrusion structure of a flame-retardant polyvinyl chloride material;
The extrusion thickness of the inner sheath layer is 1.0-1.8 mm.
According to the technical measure, the inner sheath layer is arranged to be of the extrusion structure of the flame-retardant polyvinyl chloride material, so that the flame retardant property can be improved, and the insulation property can be enhanced through the extrusion structure.
Further, the armor layer is of at least one layer of overlapped wrapping structure, wherein the galvanized steel strip is 0.2-0.8 mm thick and 30-60 mm wide, and the galvanized steel strip is arranged outside the inner sheath layer;
the overlapping rate of each layer of overlapped wrapping is more than or equal to 55 percent.
According to the technical measure, the armor layer is designed into a galvanized steel strip overlapping wrapping structure, the lap rate is more than or equal to 55%, the mechanical strength of the cable is enhanced, and the electromagnetic interference resistance is enhanced.
Further, the outer portion of the outer jacket layer is coated with a fire-resistant coating.
The technical measures can improve the flame retardant property by coating the fireproof coating on the outer part of the outer sheath layer.
Further, the outer sheath layer is of an extrusion structure of a low-smoke halogen-free flame-retardant polyethylene material.
According to the technical measure, the outer sheath layer is of the extrusion structure of the low-smoke halogen-free flame-retardant polyethylene material, so that the flame retardant property can be improved, and the insulating property can be enhanced through the extrusion structure.
The one or more technical schemes provided by the utility model have at least the following technical effects or advantages:
According to the utility model, the power shielding layer and the grounding shielding layer are respectively arranged for the power wire core and the grounding wire core, so that the electromagnetic interference resistance can be improved, and the stability and the reliability of signal transmission are ensured.
Through setting up copper wire braided shield layer and copper strips and wrap up shielding layer, further strengthen the electromagnetic interference resistance and the mechanical strength of cable.
Through coating the fireproof coating at the oversheath layer, can promote the fire behaviour of cable, be favorable to reducing the damage of external environmental factor to the cable.
Drawings
The accompanying drawings, which are included to provide a further understanding of embodiments of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the principles of the utility model;
FIG. 1 is a schematic diagram of the structure of the present utility model;
The cable comprises a 1-power cable core, a 11-power conductor, a 12-power mica tape wrapping layer, a 13-power insulating layer, a 14-power shielding layer, a 2-grounding cable core, a 21-grounding conductor, a 22-grounding mica tape wrapping layer, a 23-grounding insulating layer, a 24-grounding shielding layer, a 3-low smoke zero halogen flame retardant tape wrapping layer, a 4-total shielding layer, a 41-copper wire braiding shielding layer, a 42-copper tape wrapping shielding layer, a 5-inner sheath layer, a 6-armor layer, a 7-outer sheath layer, an 8-fireproof coating layer and a 9-flame retardant filling rope.
Detailed Description
In order that the above-recited objects, features and advantages of the present utility model will be more clearly understood, a more particular description of the utility model will be rendered by reference to the appended drawings and appended detailed description. In addition, the embodiments of the present utility model and the features in the embodiments may be combined with each other without collision.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present utility model, but the present utility model may be practiced in other ways than within the scope of the description, and therefore the scope of the utility model is not limited to the specific embodiments disclosed below.
Example 1
Referring to fig. 1, the embodiment provides an anti-interference variable frequency power cable, which comprises a cable core, wherein the cable core is provided with a plurality of power wire cores 1 and a plurality of grounding wire cores 2 which are twisted together, flame retardant filling ropes 9 are filled in twisting gaps of the cable core, the power wire cores 1 are provided with power conductors 11, a power insulating layer 13 and a power shielding layer 14 which are sequentially coated outside the power conductors 11 from inside to outside, the grounding wire cores 2 are provided with grounding conductors 21, and a grounding insulating layer 23 and a grounding shielding layer 24 which are sequentially coated outside the grounding conductors 21 from inside to outside.
The cable core is provided with 3 power wire cores 1 and 3 grounding wire cores 2, and the 3 power wire cores 1 and 3 grounding wire cores 2 are symmetrically stranded in a delta shape. The power conductor 11 and the ground conductor 21 are both the 6 th soft copper conductor in standard GB/T3956.
The power wire core 1 is also provided with a power mica tape wrapping layer 12 positioned at the inner side of the power insulating layer 13, wherein the power mica tape wrapping layer 12 is an overlapped wrapping structure with a mica tape with the thickness of 0.15mm and the width of 15mm outside the power conductor 11;
the power conductor 11 is a compound stranding structure of a plurality of tinned copper wires with the monofilament diameter of 0.1 mm;
The power insulating layer 13 is an extrusion structure of a flame-retardant crosslinked polyethylene material outside the power mica tape wrapping layer 12, and the extrusion thickness is 0.7mm.
The power shielding layer 14 is a braided structure of tinned copper wires with the diameter of 0.15mm outside the power insulating layer 13, and the braiding density is 80%.
The grounding wire core 2 is also provided with a grounding mica tape wrapping layer 22 positioned on the inner side of the grounding insulating layer 23, wherein the grounding mica tape wrapping layer 22 is an overlapped wrapping structure of a mica tape with the thickness of 0.15mm and the width of 15mm outside the grounding conductor 21;
The grounding conductor 21 is a compound stranding structure of a plurality of tinned copper wires with the monofilament diameter of 0.1 mm;
The grounding insulating layer 23 is an extrusion structure of a flame-retardant crosslinked polyethylene material outside the grounding mica tape wrapping layer 22, and the extrusion thickness is 0.7mm.
The ground shield 24 is a braided structure of tin-plated copper wires with a diameter of 0.15mm outside the ground insulation layer 23, and the braiding density is 80%.
The cable core is sequentially coated with a low-smoke halogen-free flame-retardant tape wrapping layer 3, a total shielding layer 4, an inner sheath layer 5, an armor layer 6 and an outer sheath layer 7 from inside to outside;
The total shielding layer 4 is provided with an inner copper wire braiding shielding layer 41 and an outer copper strip wrapping shielding layer 42, wherein the copper wire braiding shielding layer 41 is a braiding structure of copper wires with the diameter of 0.15mm outside the low-smoke halogen-free flame-retardant tape wrapping layer 3, and the braiding density is 90%;
The copper strip wrapping shielding layer 42 is an overlapped wrapping structure of copper strips with the thickness of 0.1mm and the width of 25mm outside the copper wire braiding shielding layer 41, and the average overlapping rate is 30% and the minimum overlapping rate is 15%.
The inner sheath layer 5 is of an extrusion structure of flame-retardant polyvinyl chloride material, and the extrusion thickness of the inner sheath layer 5 is 1.0mm.
The armor layer 6 is a layer of overlapped wrapping structure of galvanized steel strips with the thickness of 0.2mm and the width of 30mm outside the inner sheath layer 5, and the covering rate of each layer of overlapped wrapping is 55%.
The outer part of the outer jacket layer 7 is coated with a fire-resistant coating 8.
The outer sheath layer 7 is an extrusion structure of low-smoke halogen-free flame-retardant polyethylene material.
Example 2
Other contents of this embodiment are the same as embodiment 1, except that:
The power wire core 1 is also provided with a power mica tape wrapping layer 12 positioned at the inner side of the power insulating layer 13, wherein the power mica tape wrapping layer 12 is an overlapped wrapping structure with a thickness of 0.15mm and a width of 60mm of mica tapes outside the power conductor 11;
The power conductor 11 is a compound stranding structure of a plurality of tinned copper wires with the monofilament diameter of 0.5 mm;
The power insulating layer 13 is an extrusion structure of a flame-retardant crosslinked polyethylene material outside the power mica tape wrapping layer 12, and the extrusion thickness is 1.8mm.
The power shielding layer 14 is a braided structure of tinned copper wires with the diameter of 0.30mm outside the power insulating layer 13, and the braiding density is 85%.
The grounding wire core 2 is also provided with a grounding mica tape wrapping layer 22 positioned on the inner side of the grounding insulating layer 23, wherein the grounding mica tape wrapping layer 22 is an overlapped wrapping structure of a mica tape with the thickness of 0.15mm and the width of 60mm outside the grounding conductor 21;
the grounding conductor 21 is a compound stranding structure of a plurality of tinned copper wires with the monofilament diameter of 0.5 mm;
The grounding insulating layer 23 is an extrusion structure of a flame-retardant crosslinked polyethylene material outside the grounding mica tape wrapping layer 22, and the extrusion thickness is 1.0mm.
The ground shield 24 is a braided structure of tin-plated copper wires with a diameter of 0.30mm outside the ground insulation layer 23, and the braiding density is 85%.
The cable core is sequentially coated with a low-smoke halogen-free flame-retardant tape wrapping layer 3, a total shielding layer 4, an inner sheath layer 5, an armor layer 6 and an outer sheath layer 7 from inside to outside;
The total shielding layer 4 is provided with an inner copper wire braiding shielding layer 41 and an outer copper strip wrapping shielding layer 42, wherein the copper wire braiding shielding layer 41 is a braiding structure of copper wires with the diameter of 0.30mm outside the low-smoke halogen-free flame-retardant tape wrapping layer 3, and the braiding density is 92%;
The copper strip wrapping shielding layer 42 is an overlapped wrapping structure of copper strips with the thickness of 0.1mm and the width of 50mm outside the copper wire braiding shielding layer 41, and the average overlapping rate is 40% and the minimum overlapping rate is 20%.
The inner sheath layer 5 is of an extrusion structure of flame-retardant polyvinyl chloride material, and the extrusion thickness of the inner sheath layer 5 is 1.8mm.
The armor layer 6 is of a two-layer overlapped wrapping structure with a galvanized steel strip with the thickness of 0.8mm and the width of 60mm outside the inner sheath layer 5, and the overlapping rate of each layer of overlapped wrapping is 60%.
Example 3
Other contents of this embodiment are the same as embodiment 1, except that:
The power wire core 1 is also provided with a power mica tape wrapping layer 12 positioned at the inner side of the power insulating layer 13, wherein the power mica tape wrapping layer 12 is an overlapped wrapping structure with a mica tape with the thickness of 0.15mm and the width of 40mm outside the power conductor 11;
The power conductor 11 is a compound stranding structure of a plurality of tinned copper wires with the monofilament diameter of 0.3 mm;
The power insulating layer 13 is an extrusion structure of a flame-retardant crosslinked polyethylene material outside the power mica tape wrapping layer 12, and the extrusion thickness is 1.4mm.
The power shielding layer 14 is a braided structure of tinned copper wires with the diameter of 0.25mm outside the power insulating layer 13, and the braiding density is 90%.
The grounding wire core 2 is also provided with a grounding mica tape wrapping layer 22 positioned on the inner side of the grounding insulating layer 23, wherein the grounding mica tape wrapping layer 22 is an overlapped wrapping structure of a mica tape with the thickness of 0.15mm and the width of 40mm outside the grounding conductor 21;
The grounding conductor 21 is a compound stranding structure of a plurality of tinned copper wires with the monofilament diameter of 0.3 mm;
the grounding insulating layer 23 is an extrusion structure of a flame-retardant crosslinked polyethylene material outside the grounding mica tape wrapping layer 22, and the extrusion thickness is 0.8mm.
The ground shield 24 is a braided structure of tin-plated copper wires with a diameter of 0.20mm outside the ground insulation layer 23, and the braiding density is 90%.
The cable core is sequentially coated with a low-smoke halogen-free flame-retardant tape wrapping layer 3, a total shielding layer 4, an inner sheath layer 5, an armor layer 6 and an outer sheath layer 7 from inside to outside;
The total shielding layer 4 is provided with an inner copper wire braiding shielding layer 41 and an outer copper strip wrapping shielding layer 42, wherein the copper wire braiding shielding layer 41 is a braiding structure of copper wires with the diameter of 0.20mm outside the low-smoke halogen-free flame-retardant tape wrapping layer 3, and the braiding density is 91%;
The copper strip wrapping shielding layer 42 is an overlapped wrapping structure of copper strips with the thickness of 0.1mm and the width of 35mm outside the copper wire braiding shielding layer 41, and the average overlapping rate is 35% and the minimum overlapping rate is 18%.
The inner sheath layer 5 is of an extrusion structure of flame-retardant polyvinyl chloride material, and the extrusion thickness of the inner sheath layer 5 is 1.5mm.
The armor layer 6 is a three-layer overlapped wrapping structure with a galvanized steel belt with the thickness of 0.5mm and the width of 45mm outside the inner sheath layer 5, and the overlapping rate of each layer of overlapped wrapping is 63%.
While preferred embodiments of the present utility model have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the utility model.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present utility model without departing from the spirit or scope of the utility model. Thus, it is intended that the present utility model also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (5)
1. An anti-interference variable frequency power cable comprises a cable core, wherein the cable core is provided with a plurality of power wire cores (1) and a plurality of grounding wire cores (2) which are stranded together, and a flame-retardant filling rope (9) is filled in stranded gaps of the cable core;
The method is characterized in that:
The power wire core (1) is provided with a power conductor (11), and a power mica tape wrapping layer (12), a power insulating layer (13) and a power shielding layer (14) which are sequentially coated outside the power conductor (11) from inside to outside, wherein the power mica tape wrapping layer (12) is an overlapped wrapping structure with the thickness of 0.15mm and the width of 15-60 mm outside the power conductor (11);
The grounding wire core (2) is provided with a grounding conductor (21), and a grounding mica tape wrapping layer (22), a grounding insulating layer (23) and a grounding shielding layer (24) which are sequentially coated outside the grounding conductor (21) from inside to outside, wherein the grounding mica tape wrapping layer (22) is of an overlapping wrapping structure with the thickness of 0.15mm and the width of 15-60 mm, and the mica tape is outside the grounding conductor (21);
The cable core is sequentially coated with a low-smoke halogen-free flame-retardant tape wrapping layer (3), a total shielding layer (4), an inner sheath layer (5), an armor layer (6) and an outer sheath layer (7) from inside to outside;
The total shielding layer (4) is provided with an inner copper wire braiding shielding layer (41) and an outer copper strip wrapping shielding layer (42), wherein the copper wire braiding shielding layer (41) is of a braiding structure of copper wires with diameters of 0.15-0.30 mm outside the low-smoke halogen-free flame-retardant tape wrapping layer (3), the braiding density is more than or equal to 90%, and the copper strip wrapping shielding layer (42) is of an overlapping wrapping structure of copper strips with thicknesses of 0.1mm and widths of 25-50 mm outside the copper wire braiding shielding layer (41);
The inner sheath layer (5) is of an extrusion structure of a flame-retardant polyvinyl chloride material, and the extrusion thickness of the inner sheath layer (5) is 1.0-1.8 mm;
The armor layer (6) is of at least one layer of overlapped wrapping structure, wherein a galvanized steel strip with the thickness of 0.2-0.8 mm and the width of 30-60 mm is arranged outside the inner sheath layer (5), and the overlapping rate of each layer of overlapped wrapping is more than or equal to 55%;
The outer sheath layer (7) is of an extrusion structure of a low-smoke halogen-free flame-retardant polyethylene material, and a fireproof coating (8) is coated on the outer part of the outer sheath layer (7).
2. The anti-interference variable frequency power cable of claim 1, wherein:
The power conductor (11) is of a compound stranding structure of a plurality of tinned copper wires with the monofilament diameters of 0.1-0.5 mm;
The power insulating layer (13) is an extrusion structure of a flame-retardant crosslinked polyethylene material outside the power mica tape wrapping layer (12), and the extrusion thickness is 0.7-1.8 mm.
3. The anti-interference variable frequency power cable of claim 1, wherein:
the power shielding layer (14) is a braided structure of tinned copper wires with diameters of 0.15-0.30 mm outside the power insulating layer (13), and the braiding density is more than or equal to 80%.
4. The anti-interference variable frequency power cable of claim 1, wherein:
The grounding conductor (21) is a compound stranded structure of a plurality of tinned copper wires with the monofilament diameters of 0.1-0.5 mm;
The grounding insulating layer (23) is an extrusion structure of a flame-retardant crosslinked polyethylene material outside the grounding mica tape wrapping layer (22), and the extrusion thickness is 0.7-1.0 mm.
5. The anti-interference variable frequency power cable of claim 1, wherein:
The grounding shielding layer (24) is a braided structure of tinned copper wires with diameters of 0.15-0.30 mm outside the grounding insulating layer (23), and the braiding density is more than or equal to 80%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202422347388.4U CN223390310U (en) | 2024-09-26 | 2024-09-26 | Anti-interference variable frequency power cable |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202422347388.4U CN223390310U (en) | 2024-09-26 | 2024-09-26 | Anti-interference variable frequency power cable |
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| CN223390310U true CN223390310U (en) | 2025-09-26 |
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| CN202422347388.4U Active CN223390310U (en) | 2024-09-26 | 2024-09-26 | Anti-interference variable frequency power cable |
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