CN103474929A - Intensive insulation bus duct - Google Patents
Intensive insulation bus duct Download PDFInfo
- Publication number
- CN103474929A CN103474929A CN2013104269154A CN201310426915A CN103474929A CN 103474929 A CN103474929 A CN 103474929A CN 2013104269154 A CN2013104269154 A CN 2013104269154A CN 201310426915 A CN201310426915 A CN 201310426915A CN 103474929 A CN103474929 A CN 103474929A
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- CN
- China
- Prior art keywords
- busbar
- insulation bus
- intensive insulation
- bus slot
- endothermic material
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G5/00—Installations of bus-bars
- H02G5/005—Laminated bus-bars
Landscapes
- Installation Of Bus-Bars (AREA)
- Special Wing (AREA)
- Laying Of Electric Cables Or Lines Outside (AREA)
Abstract
The invention discloses an intensive insulation bus duct which comprises a busbar protecting shell and a plurality of busbars arranged in the busbar protecting shell. Each busbar comprises a busbar conductor and an insulating layer which wraps the busbar conductor. The busbars are arranged in parallel side by side. The space between the busbar protecting shell and the busbars which are arranged side by side is filled with fire-resistant materials. Inorganic heat-absorbing materials are arranged in the intensive insulation bus duct. The inorganic heat-absorbing materials in the intensive insulation bus duct can release water vapor when heated to a certain degree; heat is absorbed in the process that the inorganic heat-absorbing materials release the water vapor, and the heat absorption process can play a role in cooling; moreover, the volatilization of the water vapor can take away the heat continuously so as to lower the temperature of the bus duct, therefore, the fire resistance of the bus duct can be improved, the continuous power supply capability of the intensive insulation bus duct in a fire is improved, and the continuous power supply time of the intensive insulation bus duct in the fire is prolonged.
Description
Technical field
The present invention relates to a kind of intensive insulation bus slot.
Background technology
Be provided with bus in bus duct, in order to electric energy transmitting, there is the function of collecting and distributing electric power.By it, give each user or other electric substations the power delivery of generator, transformer or rectifier output.
Bus duct has replaced more and more electric wire in electric power conveying route engineering project.Developed country abroad, and Hong Kong of China, Macao etc. are universal.Guangzhou Guangdong in China, all Building Power Distribution room outlets more than 12 layers, the backbone that causes floor is used bus duct more than 90%; 630KVA transformer to power distribution cabinet will be used bus duct.Gongjian's project of large-and-medium size cities, hotel, office building is used also universalness of bus duct, and bus duct is the optimal selection of the following electric power conveying route of indoor rated voltage 1000V.
In the delivery of electrical energy process, carrying large electric current, high voltage due to bus duct, therefore, the bus duct product has high requirement to insulation property, fire resistance, but existing bus duct still is difficult to meet the fire resistance requirement.
Summary of the invention
The object of the present invention is to provide the intensive insulation bus slot of a kind of insulation, fire resistance excellence.
For achieving the above object, the invention provides a kind of intensive insulation bus slot, comprise the busbar protecting crust and be arranged at the some busbars in this busbar protecting crust.Busbar comprises the busbar conductor and coats the insulating barrier of this busbar conductor.These busbars be arranged in parallel side by side.Be filled with refractory matter between busbar protecting crust and these busbars be arranged side by side.Be provided with the inorganic endothermic material in intensive insulation bus slot.
Preferably, be provided with described inorganic endothermic material between described adjacent busbar.
Preferably, the described busbar be arranged side by side is coated with described inorganic endothermic material.
Preferably, the described busbar integral body be arranged side by side is placed in a built-in metal shell, be formed with the first filling slot between this built-in metal shell and the described busbar be arranged side by side, be formed with the second filling slot between this built-in metal shell and described busbar protecting crust, described built-in metal shell is coated with the inorganic endothermic material, and described the first filling slot, the second filling slot are filled with respectively described refractory matter.
Preferably, described insulating barrier is ceramic silicon rubber composite band and/or fire-resistant isinglass belt is entwined or heat-shrink tube.
Preferably, described refractory matter is fire-resistant cotton or ceramic silicon rubber.
Preferably, described inorganic endothermic material discharges for heating the material that steam absorbs heat.
Preferably, described inorganic endothermic material is one or more formation in magnesium hydroxide, aluminium hydroxide, hydrazine aluminum sulfate potassium, hydrated calcium sulfate.
Preferably, described inorganic endothermic material is fixed by fiber.
Preferably, described fiber is glass fibre.
Preferably, described busbar protecting crust is provided with the fireproof paint layer outward.
As mentioned above, be provided with the inorganic endothermic material in the intensive insulation bus slot of the present invention, this inorganic endothermic material can discharge water vapour when being heated to a certain degree, in the process of inorganic endothermic material release water vapour, absorb heat, itself can play cooling effect this endothermic process, and the water vapour volatilization can be taken away heat continuously, the temperature of bus duct is reduced, this can improve the fire resistance of bus duct, improve the continued power ability of intensive insulation bus slot in fire, extend the continued power time of intensive insulation bus slot in fire.
The accompanying drawing explanation
Fig. 1 is the cross section structure schematic diagram of the intensive insulation bus slot embodiment 1 of the present invention;
Fig. 2 is the cross section structure schematic diagram of the intensive insulation bus slot embodiment 2 of the present invention;
Fig. 3 is the cross section structure schematic diagram of the intensive insulation bus slot embodiment 3 of the present invention;
Fig. 4 is the cross section structure schematic diagram of the intensive insulation bus slot embodiment 4 of the present invention;
Fig. 5 is the cross section structure schematic diagram of the intensive insulation bus slot embodiment 5 of the present invention.
In figure: busbar protecting crust 10, metallic plate 11, bolt 12, busbar 20, busbar conductor 21, insulating barrier 22, inorganic endothermic material 30, filling slot 40, built-in metal shell 50, the first filling slot 51, the second filling slots 52, built-in metal plate 53, built-in coating section 54.
Embodiment
By describing technology contents of the present invention, modular construction in detail, being realized purpose and effect, below in conjunction with accompanying drawing, be explained in detail.
Embodiment 1
Refer to Fig. 1, the intensive insulation bus slot of the present invention roughly is rectangular-shaped, comprises busbar protecting crust 10 and is arranged at the some busbars 20 in this busbar protecting crust 10.
Busbar protecting crust 10 is guard shields of intensive insulation bus slot; be generally metal shell; for example steel or irony housing; effect with protection bus duct internal part; in the present embodiment; busbar protecting crust 10 is surrounded by four metallic plates 11, and two adjacent metallic plates are fixed together by bolt 12, can certainly be screwed.
Busbar 20 comprises busbar conductor 21 and coats the insulating barrier 22 of this busbar conductor 21.The main insulating effect that rises of 22 pairs of busbar conductors of insulating barrier 21, can be fire-resistant better, and preferably ceramic SiClx rubber composite belt, can certainly be fire-resistant isinglass belt.Insulating barrier 22 adopts ceramic silicon rubber composite band; can play the flame-retardant effect; the flame-retardant excellent performance; still can ablation form hard containment vessel even surpass the fire endurance burning; containment vessel can prevent that flame from further extending to busbar conductor 21; thereby protection is positioned at the busbar conductor 21 of ceramic silicon rubber composite band not to be damaged, and guarantees the normal usage function of busbar 20, has improved the fail safe of product.
These busbars 20 be arranged in parallel side by side, between busbar protecting crust 10 and these busbars be arranged side by side 20, are formed with filling slot 40, in filling slot 40, are filled with refractory matter.Refractory matter is preferably fire-resistant cotton or ceramic silicon rubber.
Fire-resistant cotton can play fire-resistant effect, and its be different from other refractory substance effect be to there is thermolysis, can guarantee that the temperature of fire process median generatrix groove can discharge in time, can make bus duct can keep unimpeded in fire.Fire-resistant cotton generally selects high temperature resistant in the fire-resistant cotton more than 1000 ℃.Fire-resistant cotton has the ability of expanding with heat and contract with cold, and bus duct guarantees to guarantee insulation property, guarantees the normal operation of bus in fire process.
Ceramic silicon rubber can play the flame-retardant effect; the flame-retardant excellent performance; still can ablation form hard containment vessel even surpass the fire endurance burning; containment vessel can prevent that flame from further extending to the busbar conductor; thereby protection is positioned at the busbar conductor of ceramic silicone rubber insulation layer not to be damaged; guarantee the normal usage function of busbar, improved the fail safe of product.
Be provided with inorganic endothermic material 30 in intensive insulation bus slot, inorganic endothermic material 30 refers to the inorganic material that can absorb heat when being heated and can discharge moisture.One or more in the preferred magnesium hydroxide of inorganic endothermic material, aluminium hydroxide, hydrazine aluminum sulfate potassium, hydrated calcium sulfate form, and the material of namely every heating release steam heat absorption can.
Preferably, described inorganic endothermic material 30 is fixed by fiber, the fiber preferred glass fibers.
In the present embodiment, be provided with inorganic endothermic material 30 between adjacent busbar 20.
In order further to improve its fire-resistant effect, the outer foamed fireproofing dope layer (not shown) that is provided with of busbar protecting crust 10.
Be provided with inorganic endothermic material 30 in the intensive insulation bus slot of the present invention, this inorganic endothermic material 30 can discharge water vapour when being heated to a certain degree, in the process of inorganic endothermic material release water vapour, endothermic process is arranged, itself can play cooling effect this endothermic process, and the water vapour volatilization can be taken away heat continuously, the temperature of bus duct is reduced, this can improve the fire resistance of bus duct, improve the continued power ability of intensive insulation bus slot in fire, extend intensive insulation bus slot continued power time in fire.
Embodiment 2
Refer to Fig. 2, it has disclosed the embodiment 2 of the intensive insulation bus slot of the present invention, and the present embodiment is similar to Example 1, and its difference is: no longer be provided with the inorganic endothermic material between adjacent busbar 20, inorganic endothermic material 30 is coated on outside the busbar 20 be arranged side by side.
Embodiment 3
Refer to Fig. 3, it has disclosed the embodiment 3 of the intensive insulation bus slot of the present invention, and the present embodiment is similar to Example 1, and its difference is: intensive insulation bus slot further is coated with inorganic endothermic material 30 at the busbar 20 be arranged side by side.
Embodiment 4
Refer to Fig. 4, it has disclosed the embodiment 4 of the intensive insulation bus slot of the present invention, and the present embodiment is similar to Example 1, and its difference is: the described busbar be arranged side by side 20 integral body are placed in a built-in metal shell 50.Be formed with the first filling slot 51 between built-in metal shell 50 and the busbar 20 that is arranged side by side, be formed with the second filling slot 52 between built-in metal shell 50 and busbar protecting crust 10.Built-in metal shell 50 is coated with inorganic endothermic material 30.The first filling slot 51, the second filling slot 52 are filled with respectively refractory matter.
Built-in metal shell 50 mainly play fixed supporting role, and in the present embodiment, built-in metal shell 50 is surrounded by four blocks of built-in metal plates 53, and two free ends of each built-in metal plate 53 all inwardly vertically are bent to form built-in coating section 54.
Embodiment 5
Refer to Fig. 5, it has disclosed the embodiment 5 of the intensive insulation bus slot of the present invention, the present embodiment is similar to Example 4, and its difference is: be provided with inorganic endothermic material 30 between described adjacent busbar 20, the busbar 20 be arranged side by side is coated with inorganic endothermic material 30.
In sum, be provided with inorganic endothermic material 30 in the intensive insulation bus slot of the present invention, this inorganic endothermic material 30 can discharge water vapour when being heated to a certain degree, in the process of inorganic endothermic material release water vapour, absorb heat, itself can play cooling effect this endothermic process, and the water vapour volatilization can be taken away heat continuously, the temperature of bus duct is reduced, this can improve the fire resistance of bus duct, improve the continued power ability of intensive insulation bus slot in fire, extend the continued power time of intensive insulation bus slot in fire.
The present invention is not limited to above-mentioned embodiment, and those skilled in the art that also can make multiple variation accordingly, but any and the present invention are equal to or similar variation all should be encompassed in the scope of the claims in the present invention.
Claims (14)
1. an intensive insulation bus slot, comprise the busbar protecting crust and be arranged at the some busbars in this busbar protecting crust, described busbar comprises the busbar conductor and coats the insulating barrier of this busbar conductor, these busbars be arranged in parallel side by side, be filled with refractory matter between described busbar protecting crust and these busbars be arranged side by side, it is characterized in that: in described intensive insulation bus slot, be provided with the inorganic endothermic material.
2. intensive insulation bus slot according to claim 1, is characterized in that: be provided with described inorganic endothermic material between described adjacent busbar.
3. intensive insulation bus slot according to claim 2, it is characterized in that: the described busbar be arranged side by side is coated with described inorganic endothermic material.
4. intensive insulation bus slot according to claim 1, it is characterized in that: the described busbar be arranged side by side is coated with described inorganic endothermic material.
5. intensive insulation bus slot according to claim 1, it is characterized in that: the described busbar integral body be arranged side by side is placed in a built-in metal shell, be formed with the first filling slot between this built-in metal shell and the described busbar be arranged side by side, be formed with the second filling slot between this built-in metal shell and described busbar protecting crust, described built-in metal shell is coated with the inorganic endothermic material, and described the first filling slot, the second filling slot are filled with respectively described refractory matter.
6. intensive insulation bus slot according to claim 5, is characterized in that: be provided with described inorganic endothermic material between described adjacent busbar.
7. intensive insulation bus slot according to claim 5, it is characterized in that: the described busbar be arranged side by side is coated with described inorganic endothermic material.
8. according to the described intensive insulation bus slot of claim 1 to 7 any one, it is characterized in that: described insulating barrier is ceramic silicon rubber composite band and/or fire-resistant isinglass belt is entwined or heat-shrink tube.
9. according to the described intensive insulation bus slot of claim 1 to 7 any one, it is characterized in that: described refractory matter is fire-resistant cotton or ceramic silicon rubber.
10. according to the described intensive insulation bus slot of claim 1 to 7 any one, it is characterized in that: described inorganic endothermic material discharges for heating the material that steam absorbs heat.
11., according to the described intensive insulation bus slot of claim 10 any one, it is characterized in that: described inorganic endothermic material is one or more formation in magnesium hydroxide, aluminium hydroxide, hydrazine aluminum sulfate potassium, hydrated calcium sulfate.
12. according to the described intensive insulation bus slot of claim 11 any one, it is characterized in that: described inorganic endothermic material is fixed by fiber.
13. according to the described intensive insulation bus slot of claim 12 any one, it is characterized in that: described fiber is glass fibre.
14. intensive insulation bus slot according to claim 1 is characterized in that: described busbar protecting crust is provided with the fireproof paint layer outward.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310426915.4A CN103474929B (en) | 2013-09-18 | 2013-09-18 | Intensive insulation bus duct |
| PCT/CN2013/091261 WO2015039401A1 (en) | 2013-09-18 | 2013-12-31 | Intensively insulated busway |
| PCT/CN2014/071705 WO2015039411A1 (en) | 2013-09-18 | 2014-01-28 | Fireproof structure and method for manufacturing same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310426915.4A CN103474929B (en) | 2013-09-18 | 2013-09-18 | Intensive insulation bus duct |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103474929A true CN103474929A (en) | 2013-12-25 |
| CN103474929B CN103474929B (en) | 2017-06-27 |
Family
ID=49799674
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310426915.4A Active CN103474929B (en) | 2013-09-18 | 2013-09-18 | Intensive insulation bus duct |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN103474929B (en) |
| WO (2) | WO2015039401A1 (en) |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103758434A (en) * | 2014-01-22 | 2014-04-30 | 深圳市沃尔核材股份有限公司 | Fireproof safe |
| CN103754464A (en) * | 2014-01-22 | 2014-04-30 | 深圳市沃尔核材股份有限公司 | Fireproof oil tank |
| CN103762032A (en) * | 2014-01-22 | 2014-04-30 | 深圳市沃尔核材股份有限公司 | Fire-resistant cable |
| CN103762031A (en) * | 2014-01-22 | 2014-04-30 | 深圳市沃尔核材股份有限公司 | Fire-resistant cable |
| CN104218511A (en) * | 2014-09-30 | 2014-12-17 | 深圳市沃尔核材股份有限公司 | Intensive insulated bus duct |
| CN104242206A (en) * | 2014-09-30 | 2014-12-24 | 江苏华泽机电设备有限公司 | Heat-dissipating bus duct |
| WO2015039411A1 (en) * | 2013-09-18 | 2015-03-26 | 深圳市沃尔核材股份有限公司 | Fireproof structure and method for manufacturing same |
| CN105186419A (en) * | 2015-09-22 | 2015-12-23 | 镇江加勒母线有限公司 | Waterproof and fireproof multifunctional bus duct |
| CN105186420A (en) * | 2015-11-11 | 2015-12-23 | 江苏银佳企业集团有限公司 | Flame-retardant bus duct |
| CN108997730A (en) * | 2018-09-05 | 2018-12-14 | 镇江朝阳机电科技有限公司 | A kind of plastic wire groove and manufacturing process |
| CN111276894A (en) * | 2020-03-18 | 2020-06-12 | 南通苏源恒炫电气有限公司 | Layered anti-aging insulating cover for solid insulating ring main unit |
| CN112003215A (en) * | 2020-08-26 | 2020-11-27 | 江苏中顺电气有限公司 | Light bus duct for power supply of safety channel |
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| RU2634919C1 (en) * | 2016-08-11 | 2017-11-08 | Общество с ограниченной ответственностью "Русская Техническая Компания - ЭЛЕКТРО-М" (ООО "РТК-ЭЛЕКТРО-М") | Complete cast current conductor (versions) |
| RU2755923C1 (en) * | 2021-03-31 | 2021-09-23 | Общество с ограниченной ответственностью "ПСК ПЛАСТМЕТАЛЛ" (ООО "ПСК Пластметалл") | Method for manufacturing cast insulation for conductors |
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| CN203607794U (en) * | 2013-09-18 | 2014-05-21 | 深圳市沃尔核材股份有限公司 | Intensive type insulation bus duct |
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| CN103208764A (en) * | 2013-03-15 | 2013-07-17 | 深圳市沃尔核材股份有限公司 | Intensive insulated bus duct and production method thereof |
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2013
- 2013-09-18 CN CN201310426915.4A patent/CN103474929B/en active Active
- 2013-12-31 WO PCT/CN2013/091261 patent/WO2015039401A1/en active Application Filing
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2014
- 2014-01-28 WO PCT/CN2014/071705 patent/WO2015039411A1/en active Application Filing
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| CN2190817Y (en) * | 1994-04-19 | 1995-03-01 | 邱震宇 | Fire-retardant insulation compact bus bar |
| KR20090081113A (en) * | 2008-01-23 | 2009-07-28 | 엘에스전선 주식회사 | Electric power busway duct improved thermal radiation |
| CN201436752U (en) * | 2009-05-26 | 2010-04-07 | 江苏省电力公司昆山市供电公司 | Insulation fire resistant bus duct |
| CN102604499A (en) * | 2012-03-13 | 2012-07-25 | 三棵树涂料股份有限公司 | Crystallized hydrate heat-insulation fireproof coating and preparation method |
| CN202616715U (en) * | 2012-05-30 | 2012-12-19 | 云南联方电气有限公司 | Solid insulation bus duct |
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Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015039411A1 (en) * | 2013-09-18 | 2015-03-26 | 深圳市沃尔核材股份有限公司 | Fireproof structure and method for manufacturing same |
| WO2015039401A1 (en) * | 2013-09-18 | 2015-03-26 | 深圳市沃尔核材股份有限公司 | Intensively insulated busway |
| CN103754464A (en) * | 2014-01-22 | 2014-04-30 | 深圳市沃尔核材股份有限公司 | Fireproof oil tank |
| CN103762032A (en) * | 2014-01-22 | 2014-04-30 | 深圳市沃尔核材股份有限公司 | Fire-resistant cable |
| CN103762031A (en) * | 2014-01-22 | 2014-04-30 | 深圳市沃尔核材股份有限公司 | Fire-resistant cable |
| CN103758434A (en) * | 2014-01-22 | 2014-04-30 | 深圳市沃尔核材股份有限公司 | Fireproof safe |
| CN104218511B (en) * | 2014-09-30 | 2018-07-10 | 深圳市沃尔核材股份有限公司 | Intensive insulation bus duct |
| CN104218511A (en) * | 2014-09-30 | 2014-12-17 | 深圳市沃尔核材股份有限公司 | Intensive insulated bus duct |
| CN104242206A (en) * | 2014-09-30 | 2014-12-24 | 江苏华泽机电设备有限公司 | Heat-dissipating bus duct |
| CN105186419A (en) * | 2015-09-22 | 2015-12-23 | 镇江加勒母线有限公司 | Waterproof and fireproof multifunctional bus duct |
| CN105186420A (en) * | 2015-11-11 | 2015-12-23 | 江苏银佳企业集团有限公司 | Flame-retardant bus duct |
| CN108997730A (en) * | 2018-09-05 | 2018-12-14 | 镇江朝阳机电科技有限公司 | A kind of plastic wire groove and manufacturing process |
| CN111276894A (en) * | 2020-03-18 | 2020-06-12 | 南通苏源恒炫电气有限公司 | Layered anti-aging insulating cover for solid insulating ring main unit |
| CN111276894B (en) * | 2020-03-18 | 2022-04-05 | 南通苏源恒炫电气有限公司 | Layered anti-aging insulating cover for solid insulating ring main unit |
| CN112003215A (en) * | 2020-08-26 | 2020-11-27 | 江苏中顺电气有限公司 | Light bus duct for power supply of safety channel |
| CN112003215B (en) * | 2020-08-26 | 2021-09-21 | 江苏中顺电气有限公司 | Light bus duct for power supply of safety channel |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2015039401A1 (en) | 2015-03-26 |
| CN103474929B (en) | 2017-06-27 |
| WO2015039411A1 (en) | 2015-03-26 |
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Address after: 518118 Vol Industrial Park, Lanjingbei Road, Pingshan New Area, Shenzhen City, Guangdong Province Patentee after: Shenzhen Woer Heat-shrinkable Material Co.,Ltd. Patentee after: SHENZHEN WOER SPECIAL CABLE Co.,Ltd. Patentee after: CHANGZHOU WOER HEAT-SHRINKABLE MATERIAL Co.,Ltd. Patentee after: LTK ELECTRIC WIRE (HUIZHOU) Ltd. Patentee after: HUIZHOU LTK ELECTRONIC CABLE Co.,Ltd. Address before: 518118 Vol Industrial Park, Lanjingbei Road, Pingshan New Area, Shenzhen City, Guangdong Province Patentee before: Shenzhen Woer Heat-shrinkable Material Co.,Ltd. Patentee before: SHENZHEN WOER SPECIAL CABLE Co.,Ltd. Patentee before: JINTAN WOER NEW MATERIAL Co.,Ltd. Patentee before: LTK ELECTRIC WIRE (HUIZHOU) Ltd. Patentee before: HUIZHOU LTK ELECTRONIC CABLE Co.,Ltd. |
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Effective date of registration: 20210621 Address after: 518118 Wool Industrial Park, Lanjing North Road, Longtian Street, Pingshan District, Shenzhen City, Guangdong Province Patentee after: Shenzhen Woer Heat-shrinkable Material Co.,Ltd. Patentee after: CHANGZHOU WOER HEAT-SHRINKABLE MATERIAL Co.,Ltd. Address before: 518118 Vol Industrial Park, Lanjingbei Road, Pingshan New Area, Shenzhen City, Guangdong Province Patentee before: Shenzhen Woer Heat-shrinkable Material Co.,Ltd. Patentee before: SHENZHEN WOER SPECIAL CABLE Co.,Ltd. Patentee before: CHANGZHOU WOER HEAT-SHRINKABLE MATERIAL Co.,Ltd. Patentee before: LTK ELECTRIC WIRE (HUIZHOU) Ltd. Patentee before: HUIZHOU LTK ELECTRONIC CABLE Co.,Ltd. |
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