CN220753113U - Multi-protection variable frequency cable - Google Patents
Multi-protection variable frequency cable Download PDFInfo
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- CN220753113U CN220753113U CN202322516117.2U CN202322516117U CN220753113U CN 220753113 U CN220753113 U CN 220753113U CN 202322516117 U CN202322516117 U CN 202322516117U CN 220753113 U CN220753113 U CN 220753113U
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- 239000010410 layer Substances 0.000 claims abstract description 135
- 239000003063 flame retardant Substances 0.000 claims abstract description 29
- 239000000779 smoke Substances 0.000 claims abstract description 27
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 23
- 239000010959 steel Substances 0.000 claims abstract description 23
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 18
- 239000001301 oxygen Substances 0.000 claims abstract description 18
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 18
- 239000000463 material Substances 0.000 claims abstract description 16
- 239000004020 conductor Substances 0.000 claims abstract description 15
- 239000011241 protective layer Substances 0.000 claims abstract description 15
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 claims abstract description 13
- 238000002955 isolation Methods 0.000 claims abstract description 13
- 229920000098 polyolefin Polymers 0.000 claims abstract description 13
- 241000256602 Isoptera Species 0.000 claims abstract description 9
- 230000009970 fire resistant effect Effects 0.000 claims abstract description 9
- 239000000945 filler Substances 0.000 claims abstract description 8
- 230000002265 prevention Effects 0.000 claims abstract description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 18
- 239000000919 ceramic Substances 0.000 claims description 17
- 229910052802 copper Inorganic materials 0.000 claims description 17
- 239000010949 copper Substances 0.000 claims description 17
- 239000010445 mica Substances 0.000 claims description 14
- 229910052618 mica group Inorganic materials 0.000 claims description 14
- 238000006243 chemical reaction Methods 0.000 claims description 10
- 239000002356 single layer Substances 0.000 claims description 6
- 239000011810 insulating material Substances 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 4
- 239000004718 silane crosslinked polyethylene Substances 0.000 claims description 4
- 230000000087 stabilizing effect Effects 0.000 claims description 3
- 238000002844 melting Methods 0.000 claims 1
- 230000008018 melting Effects 0.000 claims 1
- 230000004888 barrier function Effects 0.000 abstract description 3
- 241000257303 Hymenoptera Species 0.000 abstract description 2
- 241000699670 Mus sp. Species 0.000 abstract description 2
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 230000004927 fusion Effects 0.000 abstract description 2
- 241000700159 Rattus Species 0.000 description 8
- 238000002485 combustion reaction Methods 0.000 description 7
- 230000006378 damage Effects 0.000 description 6
- 238000009413 insulation Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 241001465754 Metazoa Species 0.000 description 3
- 230000009545 invasion Effects 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 206010039509 Scab Diseases 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 230000035929 gnawing Effects 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Classifications
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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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- Insulated Conductors (AREA)
Abstract
The utility model discloses a multi-protection variable frequency cable, which comprises: a plurality of cable cores; the conductor, the fire-resistant layer and the insulating layer jointly form a cable core; the peripheries of the cable cores are jointly filled with a filling layer; the periphery of the filling layer is wrapped with a cabling wrapping layer; the periphery of the cabling wrapping layer is wrapped with a shielding layer; the periphery of the shielding layer is covered with an oxygen isolation layer; an armor layer is wrapped on the periphery of the oxygen barrier layer; the outer periphery of the armor layer is covered with an outer protective layer made of B1-level halogen-free low-smoke high-flame-retardant polyolefin sheath material with rat and termite prevention and flame retardance functions; the armor layer comprises: steel wire mesh layers made of steel wires in a crossing manner; the inner side and the outer side of the steel wire mesh layer are respectively provided with a plurality of steel belts which are arranged in parallel; a filling material layer filled by B1-level halogen-free low-smoke high-flame-retardance polyolefin is arranged in the grids of the steel wire grid layer; the filler layer and the outer protective layer are in fusion connection. Has the following beneficial effects: can effectively prevent mice and ants, and has good flame retardant property and good anti-dripping property.
Description
Technical Field
The utility model relates to the technical field of cables, in particular to a multi-protection variable-frequency cable.
Background
Because the space occupation of the variable frequency cable is small, the variable frequency cable is generally buried in soil or laid indoors, channels and tunnels, and basically does not occupy space, and is mainly used for connecting the variable frequency power supply and the variable frequency motor and for transmitting electric energy through power transmission and distribution lines with rated voltage of 1KV and below. The method is widely applied to industries such as papermaking, gold treatment, metal processing, mine, railway, food processing and the like. In recent years, with the increasing awareness of safety, B1-class flame retardant electric wires and cables are widely used: high-rise buildings, markets, schools, subway stations, airports, stadiums, exhibition halls, hospitals and other densely populated public places add a safety for the daily life of people. Along with the increasing demand of B1-level flame retardation, various B1-level flame retardation cables are appeared on the market, and B1-level variable frequency cables are one of the cables, and currently, variable frequency cables mainly comprise three structures of a 3-core, a 3+E-core and a 3+3E-core (wherein E represents a grounding wire core), the performance is best, and the function is most stable and belongs to the 3+3E-core structure. The variable-frequency cable structure is generally composed of copper conductors, calcined mica tapes, silane crosslinked polyethylene insulating materials, halogen-free tapes, shielding layers, oxygen isolation layers, armor layers and outer protective layers from inside to outside, and the cable is simple in structure and can basically meet the B1-level flame retardant requirement. However, the existing variable frequency cable has the disadvantages that the shell is easy to crack and melt under the high temperature or flame condition, and combustion dripping matters or combustion particles are generated, so that the flame retardance is poor. In the using process of the variable frequency cable, besides being influenced by the surrounding environment, such as the pH value of soil, the surrounding humidity, the heat and the like, the variable frequency cable can be damaged by termites, mice and other animals. The rat and termite gnawing not only can damage a power supply system, but also can cause electric leakage and short circuit so as to cause a fire disaster to cause serious accidents.
Disclosure of Invention
In order to solve the problems, the technical scheme provided by the utility model is as follows:
a multi-protective frequency-conversion cable comprising: a plurality of cable cores; the cable core includes: a conductor composed of oxygen-free copper; the periphery of the conductor is wrapped with a fire-resistant layer made of calcined mica tape; the periphery of the fire-resistant layer is covered with an insulating layer made of silane crosslinked polyethylene insulating material; the conductor, the fire-resistant layer and the insulating layer jointly form a cable core; the peripheries of the plurality of cable cores are jointly filled with a filling layer for stabilizing the relative structure of the plurality of cable cores; the periphery of the filling layer is covered with a cable-forming wrapping layer made of a ceramic halogen-free low-smoke high-flame-retardant belt; the periphery of the cabling wrapping layer is wrapped with a shielding layer formed by oxygen-free copper wires or copper strips; the periphery of the shielding layer is wrapped with an oxygen-isolating layer made of ceramic halogen-free low-smoke polyolefin oxygen-isolating material; the periphery of the oxygen isolation layer is covered with an armor layer for protecting the internal structure of the multi-protection variable-frequency cable; the outer periphery of the armor layer is covered with an outer protective layer made of B1-level halogen-free low-smoke high-flame-retardant polyolefin sheath material with rat and termite prevention and flame retardance functions; the armor layer comprises: steel wire mesh layers made of steel wires in a crossing manner; the inner side and the outer side of the steel wire mesh layer are respectively provided with a plurality of steel belts which are arranged in parallel; a filling material layer filled by B1-level halogen-free low-smoke high-flame-retardance polyolefin is arranged in the grids of the steel wire grid layer; the filler layer and the outer protective layer are in fusion connection.
Further, the steel mesh layer is formed with two meshes in the radial direction.
Further, the fire-resistant layer is formed by overlapping and wrapping 2 layers of calcined mica tapes.
Further, the thickness of the 1-layer calcined mica tape was 0.14mm.
Further, the overlapping and wrapping rate of the 2 layers of calcined mica tapes is 25% -30%.
Further, the cabling wrapping layer is formed by overlapping and wrapping 2 layers of ceramic halogen-free low-smoke high-flame-retardant belts.
Further, the thickness of the ceramic halogen-free low-smoke high-flame-retardant belt is 0.20mm.
Further, the wrapping covering rate of the two layers of ceramic halogen-free low-smoke high-flame-retardant belts is 8% -15%.
Further, the shielding layer is made by overlapping and wrapping a single-layer copper strip.
Further, the thickness of the single-layer copper strip is 0.1mm, and the lapping coverage rate is 15% -20%.
Compared with the prior art, the technical scheme provided by the utility model has the following beneficial effects:
the multi-protection variable frequency cable of this scheme can effectively avoid the variable frequency cable to suffer destruction of animals such as termite, rat in the use, has solved the problem that the material easily drips in the combustion process simultaneously, improves variable frequency cable's fire behavior, makes the cable satisfy fire-retardant B1 and burns the low junk and reach d0 grade requirement when waiting.
Drawings
Fig. 1 is a schematic structural diagram of a multi-protective variable frequency cable according to the present application;
multi-protective variable frequency cable 10, conductor 11, refractory layer 12, insulating layer 13, filler layer 14, cabling sheath 15, shielding layer 16, oxygen barrier layer 17, armor layer 18, steel mesh layer 181, steel strip 182, filler layer 183, outer jacket 19.
Description of the embodiments
For a further understanding of the present utility model, the present utility model will be described in detail with reference to the drawings and examples.
The present application is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the utility model and are not limiting of the utility model. It should be noted that, for convenience of description, only the portions related to the utility model are shown in the drawings. The first, second, etc. words are provided for convenience in describing the technical scheme of the present utility model, and have no specific limitation, and are all generic terms, and do not constitute limitation to the technical scheme of the present utility model. It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Unless specifically stated or limited otherwise, the terms "mounted," "connected," and "coupled" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art. The technical schemes in the same embodiment and the technical schemes in different embodiments can be arranged and combined to form a new technical scheme without contradiction or conflict, which is within the scope of the utility model.
As shown in fig. 1, a multi-protective variable frequency cable 10 according to the present utility model includes: a plurality of cable cores. The cable core is functionally composed of a conductor 11, a flame retardant layer 12 and an insulating layer 13. Wherein: the conductor 11 is composed of oxygen-free copper, an oxygen-free copper wire core with copper content of 99.95% is adopted, the resistivity is small, and the structure of the conductor 11 accords with a first type solid conductor 11 and a second type stranded conductor 11 in the GB/3956 standard; the fire-resistant layer 12 is wrapped on the periphery of the conductor 11 and is made of calcined mica tape, and the calcined mica tape can be used as a protective layer of the innermost layer, so that the condition that a wire core is short-circuited or broken is caused by flame combustion can be prevented, and the fire resistance is high; the insulating layer 13 is wrapped around the refractory layer 12 and made of a silane crosslinked polyethylene insulating material, and has high insulation resistance and excellent electrical insulation performance.
Further, the outer periphery of the plurality of cable cores is commonly filled with the filling layer 14 for stabilizing the relative structure of the plurality of cable cores, and the filling layer 14 is filled with glass fibers, so that the toughness is good, and the cable cores are supported structurally and buffered in a stretching manner. The outer periphery of the filling layer 14 is wrapped with a cabling wrapping layer 15, the cabling wrapping layer 15 is made of a ceramic halogen-free low-smoke high-flame-retardant belt, the ceramic halogen-free low-smoke high-flame-retardant belt is tightly tied into a cable to form a wrapping layer, the cable can be encrusted when encountering fire, the oxygen insulation and heat insulation effects are good, and the damage of high-temperature flame to the inside of a circuit can be effectively isolated. The shielding layer 16 is wrapped on the periphery of the cabling wrapping layer 15, the shielding layer 16 is composed of oxygen-free copper wires or copper strips, the electromagnetic shielding effect is good, electromagnetic interference between the shielding layer and the outside can be prevented, and normal operation of a signal line is guaranteed. The outer periphery of the shielding layer 16 is wrapped with an oxygen isolation layer 17, the oxygen isolation layer 17 is made of ceramic halogen-free low-smoke polyolefin oxygen isolation material, and the ceramic halogen-free low-smoke polyolefin oxygen isolation material is crusted when meeting fire, plays a role in oxygen isolation and heat insulation, and can further isolate the invasion of high-temperature flame to the inside of a circuit. An armor layer 18 is wrapped around the outer periphery of the oxygen barrier layer 17 for protecting the internal structure of the multi-shielded variable frequency cable 10. The outer periphery of the armor layer 18 is wrapped with an outer protective layer 19, the outer protective layer 19 is made of a B1-level halogen-free low-smoke high-flame-retardant polyolefin sheath material with a rat and termite preventing flame-retardant function, halogen-free acid gas is emitted in a combustion environment of the cable, the smoke generating amount is extremely low, the cable is nontoxic and environment-friendly, the crusting performance is excellent, the cable is free from dripping, the drip preventing performance is high, and the internal cable core structure can be effectively protected.
As a preferred structure, the armor 18 includes the wire mesh layer 181 of making by the steel wire is alternately, all is equipped with many parallel arrangement's steel band 182 in the inboard and the outside of wire mesh layer 181, through the structure cooperation of wire mesh layer 181 and steel band 182 like this, can effectively protect cable inner protection structure, has the support protection effect, also can avoid the rat and ant to gnaw simultaneously and take advantage of the damage inner structure, and the material attribute of metal also can reduce the heat production.
Further, a filler layer 183 is provided in the mesh of the steel mesh layer 181, the filler layer 183 is filled with a B1-grade halogen-free low smoke high flame retardant polyolefin, and the filler layer 183 and the outer sheath 19 are melt-connected. The stability of the supporting structure of the armor layer 18 can be further improved, the crusting performance of the outer protective layer 19 can be further extended, the internal structure is protected, and dripping matters generated by oral combustion are prevented.
As a specific embodiment, the wire mesh layer 181 is formed with two meshes in the radial direction, so that the structural strength and the supporting performance of the cable outer layer are higher, preventing the cable outer layer from being broken.
As a specific embodiment, the refractory layer 12 is formed by overlapping and wrapping 2 layers of calcined mica tape. The thickness of the 1 layer calcined mica tape was 0.14mm. The overlapping and wrapping covering rate of the 2 layers of calcined mica tapes is 25% -30%. The cabling wrapping layer 15 is formed by overlapping and wrapping 2 layers of ceramic halogen-free low-smoke high-flame-retardant belts. The thickness of the ceramic halogen-free low-smoke high-flame-retardant belt is 0.20mm. The wrapping covering rate of the two layers of ceramic halogen-free low-smoke high-flame-retardant belts is 8% -15%. The shielding layer 16 is made by overlapping and wrapping a single layer of copper tape. The thickness of the single-layer copper strip is 0.1mm, and the lapping coverage rate is 15% -20%. The radial dimension of the cable is controlled while the structural performance of the cable is ensured, and the use is more convenient.
In the structure, the cabling wrapping layer 15 and the oxygen isolation layer 17 are made of ceramic materials, and are encrusted when meeting fire, so that the oxygen isolation and heat insulation effects are achieved, and the invasion of high-temperature flame to the inside of the cable can be effectively isolated. The cable is made of materials with excellent anti-dripping performance from inside to outside, automatically crusts when encountering flame, does not drip, forms a protective layer, and has excellent oxygen and heat insulation and flame retardant performance. The overall structure can meet the requirement of the drip level d0 in the flame retardant B1 level in the standard GB 31247. The armor layer 18 and the outer protective layer 19 both play a role in protecting the inner protective wire core from being damaged, and meanwhile, the inside of the armor layer 18 and the outer protective layer 19 are made of rat and termite resistant B1-level halogen-free low-smoke high-flame-retardant polyolefin materials, so that the anti-termite flame-retardant cable has excellent crusting performance, does not drip and has excellent flame retardant effect. The outer protective layer 19 and the armor layer 18 are matched for use, so that short circuit caused by damage of rats and ants and damage to equipment can be effectively avoided, fire disaster is avoided, and economic loss is reduced.
In summary, the multi-protection variable frequency cable 10 of the present solution can effectively avoid the variable frequency cable from being damaged by termites, rats and other animals in the use process, and simultaneously solve the problem that the material is easy to drop in the combustion process, improve the flame retardant performance of the variable frequency cable, and make the cable meet the requirement of the flame retardant B1 grade and simultaneously burn the low-drop object to reach the d0 grade.
The utility model and its embodiments have been described above by way of illustration and not limitation, and the utility model is illustrated in the accompanying drawings and described in the drawings in which the actual structure is not limited thereto. Therefore, if one of ordinary skill in the art is informed by this disclosure, the structural mode and the embodiments similar to the technical scheme are not creatively designed without departing from the gist of the present utility model.
Claims (10)
1. A multi-protective frequency-conversion cable comprising: a plurality of cable cores; it is characterized in that the method comprises the steps of,
the cable core includes: a conductor composed of oxygen-free copper;
the periphery of the conductor is wrapped with a fire-resistant layer made of calcined mica tape;
the periphery of the fireproof layer is covered with an insulating layer made of silane crosslinked polyethylene insulating material;
the conductor, the fire-resistant layer and the insulating layer function together to form the cable core;
the outer circumferences of the plurality of cable cores are jointly filled with a filling layer for stabilizing the relative structures of the plurality of cable cores;
the periphery of the filling layer is wrapped with a cable-forming wrapping layer made of a ceramic halogen-free low-smoke high-flame-retardant belt;
the periphery of the cabling wrapping layer is wrapped with a shielding layer formed by oxygen-free copper wires or copper strips;
the periphery of the shielding layer is wrapped with an oxygen isolation layer made of ceramic halogen-free low-smoke polyolefin oxygen isolation material;
the periphery of the oxygen isolation layer is wrapped with an armor layer for protecting the internal structure of the multi-protection variable frequency cable;
the outer periphery of the armor layer is wrapped with an outer protective layer made of a B1-level halogen-free low-smoke high-flame-retardance polyolefin sheath material with a rat and termite prevention flame-retardant function;
the armor layer comprises: steel wire mesh layers made of steel wires in a crossing manner;
the inner side and the outer side of the steel wire mesh layer are respectively provided with a plurality of steel belts which are arranged in parallel;
a filling material layer filled by B1-level halogen-free low-smoke high-flame-retardance polyolefin is arranged in the grids of the steel wire grid layer;
and the filler layer and the outer protective layer are connected in a melting way.
2. The multi-protective frequency-conversion cable of claim 1, wherein,
the steel wire mesh layer is formed with two meshes in a radial direction.
3. The multi-protective frequency-conversion cable of claim 1, wherein,
the fire-resistant layer is formed by overlapping and wrapping 2 layers of calcined mica tapes.
4. A multi-protective variable frequency cable as defined in claim 3, wherein,
the thickness of the calcined mica tape of 1 layer is 0.14mm.
5. The multi-protective frequency-conversion cable of claim 4, wherein,
and the overlapping and wrapping covering rate of the 2 layers of calcined mica tapes is 25% -30%.
6. The multi-protective frequency-conversion cable of claim 1, wherein,
the cabling wrapping layer is formed by overlapping and wrapping 2 layers of ceramic halogen-free low-smoke high-flame-retardant belts.
7. The multi-protective frequency-conversion cable of claim 6, wherein,
the thickness of the ceramic halogen-free low-smoke high-flame-retardant belt is 0.20mm.
8. The multi-protective frequency-conversion cable of claim 7, wherein,
the wrapping and covering rate of the two layers of the ceramic halogen-free low-smoke high-flame-retardant belts is 8% -15%.
9. The multi-protective frequency-conversion cable of claim 1, wherein,
the shielding layer is made by overlapping and wrapping a single-layer copper strip.
10. The multi-protective frequency-conversion cable of claim 9, wherein the cable is a cable,
the thickness of the single-layer copper strip is 0.1mm, and the lapping coverage rate is 15% -20%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322516117.2U CN220753113U (en) | 2023-09-15 | 2023-09-15 | Multi-protection variable frequency cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322516117.2U CN220753113U (en) | 2023-09-15 | 2023-09-15 | Multi-protection variable frequency cable |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220753113U true CN220753113U (en) | 2024-04-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322516117.2U Active CN220753113U (en) | 2023-09-15 | 2023-09-15 | Multi-protection variable frequency cable |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220753113U (en) |
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2023
- 2023-09-15 CN CN202322516117.2U patent/CN220753113U/en active Active
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