CN215868687U - Flexible mineral insulation fireproof cable with metal copper alloy sheath - Google Patents
Flexible mineral insulation fireproof cable with metal copper alloy sheath Download PDFInfo
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- CN215868687U CN215868687U CN202121995907.8U CN202121995907U CN215868687U CN 215868687 U CN215868687 U CN 215868687U CN 202121995907 U CN202121995907 U CN 202121995907U CN 215868687 U CN215868687 U CN 215868687U
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- 229910052500 inorganic mineral Inorganic materials 0.000 title claims abstract description 45
- 239000011707 mineral Substances 0.000 title claims abstract description 44
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 42
- 239000002184 metal Substances 0.000 title claims abstract description 42
- 238000009413 insulation Methods 0.000 title claims abstract description 14
- 229910000881 Cu alloy Inorganic materials 0.000 title claims abstract description 13
- 239000003063 flame retardant Substances 0.000 claims abstract description 86
- 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 84
- 239000010410 layer Substances 0.000 claims abstract description 70
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 55
- 229910052802 copper Inorganic materials 0.000 claims abstract description 55
- 239000010949 copper Substances 0.000 claims abstract description 55
- 239000011241 protective layer Substances 0.000 claims abstract description 28
- 239000000779 smoke Substances 0.000 claims abstract description 13
- 239000004020 conductor Substances 0.000 claims description 4
- 230000002265 prevention Effects 0.000 claims description 3
- 239000000945 filler Substances 0.000 claims description 2
- 239000011248 coating agent Substances 0.000 claims 4
- 238000000576 coating method Methods 0.000 claims 4
- 230000002035 prolonged effect Effects 0.000 abstract description 7
- 230000000694 effects Effects 0.000 description 10
- 238000003466 welding Methods 0.000 description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 238000009434 installation Methods 0.000 description 4
- 238000002485 combustion reaction Methods 0.000 description 3
- 230000009970 fire resistant effect Effects 0.000 description 3
- 239000011810 insulating material Substances 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- DXZMANYCMVCPIM-UHFFFAOYSA-L zinc;diethylphosphinate Chemical compound [Zn+2].CCP([O-])(=O)CC.CCP([O-])(=O)CC DXZMANYCMVCPIM-UHFFFAOYSA-L 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- RJDOZRNNYVAULJ-UHFFFAOYSA-L [O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[F-].[F-].[Mg++].[Mg++].[Mg++].[Al+3].[Si+4].[Si+4].[Si+4].[K+] Chemical compound [O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[F-].[F-].[Mg++].[Mg++].[Mg++].[Al+3].[Si+4].[Si+4].[Si+4].[K+] RJDOZRNNYVAULJ-UHFFFAOYSA-L 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000004049 embossing Methods 0.000 description 1
- 238000009422 external insulation Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000010297 mechanical methods and process Methods 0.000 description 1
- 239000010445 mica Substances 0.000 description 1
- 229910052618 mica group Inorganic materials 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Abstract
The utility model discloses a flexible mineral insulation fireproof cable with a metal copper alloy sheath, which comprises a metal copper sheath protective layer, wherein a copper conductive wire core is arranged in the inner cavity of the metal copper sheath protective layer, a halogen-free flame-retardant filling rope is filled between the metal copper sheath protective layer and the copper conductive wire core, and a mineral insulating layer is coated on the surface of the metal copper sheath protective layer. According to the utility model, the halogen-free flame-retardant filling rope, the mineral insulating layer, the fireproof flame-retardant layer, the halogen-free flame-retardant wrapping tape layer and the extruded halogen-free low-smoke flame-retardant outer sheath are matched with each other, so that the advantages of improving the insulating property and the waterproof flame-retardant property of the cable are achieved, the insulating property of the cable can be effectively improved when the cable is used, the problem of electric leakage of the cable is avoided, a certain potential safety hazard is reduced, meanwhile, when the cable meets a fire source, the fireproof flame-retardant property of the cable can be effectively improved, the cable is prevented from being burnt and damaged, and the service life of the cable is prolonged.
Description
Technical Field
The utility model relates to the technical field of cables, in particular to a flexible mineral insulation fireproof cable with a metal copper alloy sheath.
Background
A cable is a power or signal transmission device, generally consisting of several or several groups of conductors, defining one: the wire is made of one or more mutually insulated conductors and an outer-coated insulating protective layer, and is used for transmitting power or information from one place to another place, and the two definitions are as follows: generally, the cable is a cable similar to a rope formed by twisting several or several groups of wires (each group is at least two), each group of wires are insulated from each other and are usually twisted around a center, the whole outside is coated with a high-insulation covering layer, the cable has the characteristics of internal electrification and external insulation, and the cable comprises a power cable, a control cable, a compensation cable, a shielding cable, a high-temperature cable, a computer cable, a signal cable, a coaxial cable, a fire-resistant cable, a marine cable, a mining cable, an aluminum alloy cable and the like, and the cables consist of single-strand or multi-strand wires and an insulation layer and are used for connecting circuits, electrical appliances and the like.
The existing cables have the following disadvantages: the existing cable has poor insulating property, so that when the cable is used, the phenomenon of electric leakage easily occurs, certain potential safety hazard exists, meanwhile, the fireproof and flame-retardant properties of the cable are poor, so that when the cable meets a fire source, the cable is easily burnt and damaged, and the service life of the cable is shortened.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a flexible mineral insulation fireproof cable with a metal copper alloy sheath, which has the advantages of improving the insulation performance and the waterproof and flame-retardant performance of the cable, and solves the problems that the existing cable is poor in insulation performance, so that the cable is easy to leak electricity when in use, has certain potential safety hazards, and is poor in fireproof and flame-retardant performance, so that the cable is easy to burn and damage when encountering a fire source.
In order to achieve the purpose, the utility model provides the following technical scheme: a flexible mineral insulation fireproof cable with a metal copper alloy sheath comprises a metal copper sheath protective layer, wherein a copper conductive wire core is arranged in an inner cavity of the metal copper sheath protective layer, a halogen-free flame-retardant filling rope is filled between the metal copper sheath protective layer and the copper conductive wire core, a mineral insulating layer is coated on the surface of the metal copper sheath protective layer, and a fireproof flame-retardant layer is arranged on the surface of the mineral insulating layer;
the fireproof flame-retardant layer comprises a halogen-free flame-retardant wrapping tape layer, and the surface of the halogen-free flame-retardant wrapping tape layer is coated with an extruded halogen-free low-smoke flame-retardant outer sheath.
Preferably, the inner wall of the halogen-free flame-retardant wrapping band layer is bonded and connected with the surface of the mineral insulating layer, and the thickness of the halogen-free flame-retardant wrapping band layer is the same as that of the extruded halogen-free low-smoke flame-retardant outer sheath.
Preferably, the number of the copper conductive wire cores is three, and the three groups of the copper conductive wire cores are formed by twisting copper wires.
Preferably, the surfaces of the copper conductive wire core and the halogen-free flame-retardant filling rope are located in an inner cavity of the metal copper sheathing protective layer, the inner cavity of the mineral insulating layer is located on the surface of the metal copper sheathing protective layer, and the inner cavity of the fireproof flame-retardant layer is located on the surface of the mineral insulating layer.
Preferably, the diameter of the mineral insulating layer is larger than that of the metal copper sheathing protective layer, and the diameter of the fireproof flame-retardant layer is larger than that of the mineral insulating layer.
Compared with the prior art, the utility model has the following beneficial effects:
1. according to the utility model, the halogen-free flame-retardant filling rope, the mineral insulating layer, the fireproof flame-retardant layer, the halogen-free flame-retardant wrapping tape layer and the extruded halogen-free low-smoke flame-retardant outer sheath are matched with each other, so that the advantages of improving the insulating property and the waterproof flame-retardant property of the cable are achieved, the insulating property of the cable can be effectively improved when the cable is used, the problem of electric leakage of the cable is avoided, a certain potential safety hazard is reduced, meanwhile, when the cable meets a fire source, the fireproof flame-retardant property of the cable can be effectively improved, the cable is prevented from being burnt and damaged, and the service life of the cable is prolonged.
2. The metal copper sleeve protective layer is arranged, so that the effect of improving the strength of the cable is achieved, the protection effect on the cable is improved, meanwhile, the flexibility of the cable can be guaranteed, the halogen-free flame-retardant filling rope is arranged, the fireproof and flame-retardant effects on the cable can be achieved, the fireproof and flame-retardant performance of the cable can be effectively improved, the service life of the cable is prolonged, the mineral insulating layer is arranged, the insulating performance of the cable is improved, the problem of electric leakage of the cable is solved, certain potential safety hazards are reduced, the fireproof and flame-retardant performance of the cable can be effectively improved by arranging the fireproof and flame-retardant layer, the halogen-free flame-retardant wrapping tape layer and the extruded low-smoke halogen-free flame-retardant outer sheath in a matched mode, the fireproof and flame-retardant effects on the cable are achieved, the fireproof and flame-retardant performance of the cable can be effectively improved, the cable is prevented from being burnt and damaged, and the service life of the cable is prolonged.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is an enlarged sectional view of the inner structure of the fireproof flame-retardant layer of the present invention.
In the figure: 1. a metal copper sleeve protective layer; 2. a copper conductive core; 3. a halogen-free flame-retardant filler rope; 4. a mineral insulation layer; 5. a fire resistant and flame retardant layer; 51. a halogen-free flame retardant belting layer; 52. an extruded halogen-free low-smoke flame-retardant outer sheath.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description herein, it is to be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientations and positional relationships indicated in the drawings to facilitate the description of the patent and to simplify the description, but do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus are not to be considered limiting of the patent. In the description of the present application, it should be noted that unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "disposed" are to be construed broadly and can, for example, be fixedly connected, disposed, detachably connected, disposed, or integrally connected and disposed. The specific meaning of the above terms in this patent may be understood by those of ordinary skill in the art as appropriate.
Referring to fig. 1-2, a flexible mineral insulation fireproof cable with a metal copper alloy sheath comprises a metal copper sheath protective layer 1, a copper conductive wire core 2 is arranged in an inner cavity of the metal copper sheath protective layer 1, a halogen-free flame retardant filling rope 3 is filled between the metal copper sheath protective layer 1 and the copper conductive wire core 2, a mineral insulating layer 4 is coated on the surface of the metal copper sheath protective layer 1, and a fireproof flame retardant layer 5 is arranged on the surface of the mineral insulating layer 4;
the fireproof flame-retardant layer 5 comprises a halogen-free flame-retardant belting layer 51, the surface of the halogen-free flame-retardant belting layer 51 is coated with an extruded halogen-free low-smoke flame-retardant outer sheath 52, the inner wall of the halogen-free flame-retardant belting layer 51 is bonded with the surface of the mineral insulating layer 4, the thicknesses of the halogen-free flame-retardant belting layer 51 and the extruded halogen-free low-smoke flame-retardant outer sheath 52 are the same, the number of the copper conductive wire cores 2 is three, the three groups of copper conductive wire cores 2 are formed by stranding copper wires, the surfaces of the copper conductive wire cores 2 and the halogen-free flame-retardant filling rope 3 are positioned in the inner cavity of the metal copper sheathing protective layer 1, the inner cavity of the mineral insulating layer 4 is positioned on the surface of the metal copper sheathing protective layer 1, the diameter of the mineral insulating layer 5 is larger than that of the metal copper sheathing protective layer 1, the diameter of the fireproof flame-retardant layer 5 is larger than that of the mineral insulating layer 4, by arranging the metal copper sheathing protective layer 1, the cable has the advantages that the cable has the effect of improving the strength of the cable, the protection effect on the cable is improved, meanwhile, the flexibility of the cable can be ensured, the fireproof and flame-retardant effects on the cable can be realized by arranging the halogen-free flame-retardant filling rope 3, the fireproof and flame-retardant performance of the cable can be effectively improved, the service life of the cable is prolonged, the insulating performance of the cable can be improved by arranging the mineral insulating layer 4, the problem of electric leakage of the cable is avoided, certain potential safety hazards are reduced, the fireproof and flame-retardant layer 5, the halogen-free flame-retardant wrapping layer 51 and the halogen-free low-smoke flame-retardant outer sheath 52 of the extruded bag are matched with each other, the fireproof and flame-retardant performance of the cable can be effectively improved, the cable is prevented from being burnt and damaged, the service life of the cable is prolonged, the halogen-free flame-retardant filling rope 3, the mineral insulating layer 4, the fireproof and flame-retardant layer 5, the halogen-free flame-retardant wrapping layer 51 and the halogen-free low-smoke flame-retardant outer sheath 52 of the extruded bag are matched with each other, the cable has the advantages of improving the insulating property and the waterproof and flame-retardant property of the cable, effectively improving the insulating property of the cable when the cable is used, avoiding the problem of electric leakage of the cable, reducing certain potential safety hazards, effectively improving the fireproof and flame-retardant property of the cable when the cable meets a fire source, preventing the cable from being burnt and damaged, and prolonging the service life of the cable.
When in use, the metal copper sleeve protective layer 1 is arranged to play a role in improving the strength of the cable, improve the protection effect on the cable and simultaneously ensure the flexibility of the cable, and the halogen-free flame-retardant filling rope 3 is arranged, has the effects of fire prevention and flame retardation on the cable, can effectively improve the fire prevention and flame retardation performance of the cable, prolongs the service life of the cable, the mineral insulating layer 4 is arranged, so that the insulating property of the cable is improved, the problem of electric leakage of the cable is avoided, certain potential safety hazard is reduced, by arranging the fireproof flame-retardant layer 5, the halogen-free flame-retardant wrapping tape layer 51 and the extruded halogen-free low-smoke flame-retardant outer sheath 52 to be matched with each other, the fireproof flame-retardant cable has the advantages that the fireproof flame-retardant effect is achieved on the cable, the fireproof flame-retardant performance of the cable can be effectively improved, the cable is prevented from being burnt and damaged, the service life of the cable is prolonged, and therefore the insulating performance and the waterproof flame-retardant performance of the cable are improved.
The mineral insulating layer 4 is made of calcined synthetic mica tape, and the volume resistivity of the mica tape in a normal state is not less than 1.0 x 1010Omega, m, insulation resistance at fire resistance test temperature should not be less than 1.0 x 106And omega, m, the material is manufactured in a multi-layer overlapping and concentric wrapping mode.
The metal copper sheathing protective layer 1 adopts a high-conductivity annealed copper alloy strip, and a longitudinal argon arc welding continuous welding embossing process is used, so that the protective effect can be achieved, and the flexibility of the cable during installation can be ensured.
The standard parts used in this document are commercially available, all the components in this document are customized according to the description of the specification and the drawings, and the connection relationship and specific structure between the layers in this document are all performed by the prior art, such as by mechanical methods, by adhesives, by various welding methods (such as thermal welding, ultrasonic welding, flux, welding, and fusion welding), and no specific description is made here.
The cable has excellent fireproof performance, the fire-resistant grade can meet the requirements of national standard GB/T19216.21-2003 for 1000 ℃ and 180min, the insulating material of the cable adopts an inorganic mineral insulating tape for continuous wrapping, the continuous length is long, no matter a single-core cable or a multi-core cable, the length of the cable can meet the requirement of power supply length, each continuous length can reach more than 1000m, the cable has flexibility, the cable can be coiled on a cable coil, the bending radius of the cable is 6-10D, (D is the outer diameter of the cable), the cable is smokeless and nontoxic during combustion, the insulating material (non-combustion body) is adopted, no harmful gas is generated during combustion, no secondary pollution is generated, the overload capacity is large, the carrying capacity of the cable is large, the overload capacity is large, the cable has large overload capacity, the surface temperature of the cable is usually less than or equal to 70 ℃ according to wiring requirements, if the wiring cannot be touched, and the temperature of a cable sheath can be increased to 105 ℃ when the cable is not contacted with a combustible building material, when the fireproof cable is overloaded, the long-term working temperature of the fireproof cable can reach 250 ℃, the organic mineral insulating fireproof cable sometimes needs to penetrate through a plastic pipe or an iron pipe, the plastic pipe is easy to age and become crisp, the iron pipe is easy to rust, the fireproof cable has a copper sheath which does not need to penetrate through the pipe, the copper sheath has good corrosion resistance and does not have electromagnetic interference, when the fireproof cable and lines of information, control and the like are laid in the same vertical shaft, under the shielding of the copper sheath, the interference on the information transmitted by the signal and the control wire and cable is avoided, the safety is good, the fireproof cable can normally supply power in flame, the fire extinguishing equipment is started, the fire loss is reduced, the personal safety is particularly reliable, the copper sheath is an excellent conductor, the best grounding PE line is used and is continuous to the whole length of the cable, the grounding protection sensitivity and reliability are greatly improved, the service life is long, the temperature resistance of an inorganic insulating material is high, the ageing is not easy, the service life of the organic mineral insulating fireproof cable is many times longer than that of an organic insulating cable, under the normal working state, the service life of the flexible fireproof cable can reach more than 100 years, the flexible fireproof cable is similar to a common cable in packaging, transportation, installation and accessories, the flexible fireproof cable is simpler and has good economical efficiency, the flexible fireproof cable is advanced in manufacturing process and simple in installation, the comprehensive cost of the flexible fireproof cable is obviously lower than that of a rigid mineral insulated cable under the same condition, and the flexible fireproof cable can be coiled and paid off as the common cable; the cable basically does not absorb moisture, and the terminal installation is simple and similar to a common cable.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.
Claims (5)
1. The utility model provides a flexible mineral insulation fireproof cable of metal copper alloy sheath, includes metal copper sheathing inoxidizing coating (1), its characterized in that: a copper conductive wire core (2) is arranged in an inner cavity of the metal copper sheathing protective layer (1), a halogen-free flame-retardant filling rope (3) is filled between the metal copper sheathing protective layer (1) and the copper conductive wire core (2), a mineral insulating layer (4) is coated on the surface of the metal copper sheathing protective layer (1), and a fireproof flame-retardant layer (5) is arranged on the surface of the mineral insulating layer (4);
the fireproof flame-retardant layer (5) comprises a halogen-free flame-retardant wrapping tape layer (51), and the surface of the halogen-free flame-retardant wrapping tape layer (51) is coated with an extruded halogen-free low-smoke flame-retardant outer sheath (52).
2. The metal copper alloy sheathed flexible mineral insulated fireproof cable of claim 1, wherein: the inner wall of the halogen-free flame-retardant wrapping tape layer (51) is bonded and connected with the surface of the mineral insulating layer (4), and the thickness of the halogen-free flame-retardant wrapping tape layer (51) is the same as that of the extruded halogen-free low-smoke flame-retardant outer sheath (52).
3. The metal copper alloy sheathed flexible mineral insulated fireproof cable of claim 1, wherein: the number of the copper conductive wire cores (2) is three, and the three groups of the copper conductive wire cores (2) are formed by stranding copper wires.
4. The metal copper alloy sheathed flexible mineral insulated fireproof cable of claim 1, wherein: the surface of copper conductor core (2) and halogen-free flame-retardant filler rope (3) is located the inner cavity of metal copper sheathing inoxidizing coating (1), the inner cavity of mineral insulating layer (4) is located the surface of metal copper sheathing inoxidizing coating (1), the inner cavity of fire prevention flame retardant coating (5) is located the surface of mineral insulating layer (4).
5. The metal copper alloy sheathed flexible mineral insulated fireproof cable of claim 1, wherein: the diameter of the mineral insulating layer (4) is larger than that of the metal copper sleeve protective layer (1), and the diameter of the fireproof flame-retardant layer (5) is larger than that of the mineral insulating layer (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121995907.8U CN215868687U (en) | 2021-08-23 | 2021-08-23 | Flexible mineral insulation fireproof cable with metal copper alloy sheath |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121995907.8U CN215868687U (en) | 2021-08-23 | 2021-08-23 | Flexible mineral insulation fireproof cable with metal copper alloy sheath |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215868687U true CN215868687U (en) | 2022-02-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121995907.8U Active CN215868687U (en) | 2021-08-23 | 2021-08-23 | Flexible mineral insulation fireproof cable with metal copper alloy sheath |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215868687U (en) |
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2021
- 2021-08-23 CN CN202121995907.8U patent/CN215868687U/en active Active
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