CN109509583A - 一种防火隔热型超高垂直安装用抗拉中压电缆 - Google Patents
一种防火隔热型超高垂直安装用抗拉中压电缆 Download PDFInfo
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Abstract
本发明公开了一种防火隔热型超高垂直安装用抗拉中压电缆,包括缆芯,所述的缆芯由多根绝缘线芯以及与绝缘线芯数量相同的抗拉承载线芯绞合而成,在缆芯的间隙处填充表面涂覆有隔热保温涂料的PP填充绳,在缆芯外绕包PP带,在PP带外挤包第一PVC内护层,第一PVC内护层外表面涂覆隔热保温涂料层,在隔热保温涂料层外挤包第二PVC内护层,在第二PVC内护层外绕包绝缘隔离带后包覆铝合金联锁铠装层,在铝合金联锁铠装层外挤包内外表面涂覆有隔热保温涂料的低烟无卤外护套。本发明具有抗张强度、抗撕裂强度、耐环境应力开裂性、耐低温性、耐热性以及耐穿刺性。
Description
技术领域
本发明涉及电缆领域,具体是一种防火隔热型超高垂直安装用抗拉中压电缆。
背景技术
随着我国城镇化建设的不断推进,高层建筑越来越多,建筑高度也在不断上升。目前已有建筑突破600米高度,随着建筑高度的不断攀升,高层建筑容积率和用电量以及传输功率也在不断增大,这就需要能够安全有效传输动力的大容量中压垂直安装电缆以满足高层建筑动力传输的需求。
从高层建筑的经济性能出发,作为电力的传输的载体,安装在高层建筑的顶层最为经济。这就需要用一根中压电缆垂直敷设在高层建筑中。作为高层建筑的主干电缆,电缆重量要求越轻越好,现有的技术工艺是采用钢丝铠装电缆以满足高层建筑的需求,具体是采用三芯成缆后的隔离套外螺旋排列钢丝,以增强电缆的纵向抗拉能力。该结构电缆存在以下问题:1)重量大,并且钢丝固定困难,增加施工难度;2)铠装电缆外径较大,增强敷设难度,浪费材料,导致电缆成本增加;3)屏蔽效果不是很理想,其密度较大,导致其比重大,且质硬,加工性能不太理想;4)现有的用于电缆制造的无纺布,其介电以及耐热性能较差;5)耐冲击性,机械性质强韧,抗多种有机溶剂和酸碱腐蚀性差;6)抗张强度、抗撕裂强度、耐环境应力开裂性、耐低温性、耐热性以及耐穿刺等性能差。
发明内容
本发明为了解决现有技术中存在的问题,提供了一种防火隔热型超高垂直安装用抗拉中压电缆。
本发明所述的一种防火隔热型超高垂直安装用抗拉中压电缆,包括缆芯,所述的缆芯由多根绝缘线芯以及与绝缘线芯数量相同的抗拉承载线芯绞合而成,在缆芯的间隙处填充表面涂覆有隔热保温涂料的PP填充绳,在缆芯外绕包PP带,在PP带外挤包第一PVC内护层,第一PVC内护层外表面涂覆隔热保温涂料层,在隔热保温涂料层外挤包第二PVC内护层,在第二PVC内护层外绕包绝缘隔离带后包覆铝合金联锁铠装层,在铝合金联锁铠装层外挤包内外表面涂覆有隔热保温涂料的低烟无卤外护套。
进一步改进,所述的绝缘线芯由导体以及依次在导体外设有导体屏蔽层、绝缘层、屏蔽膜、镀锡铜丝屏蔽层构成。
进一步改进,所述的绝缘隔离带包括由外而内设置的防水层、加强层和内衬层,所述加强层包括上粘合层、下粘合层以及设置在上粘合层和下粘合层之间的聚乙烯绝缘层,所述防水层的内侧与上粘合层进行粘接,所述内衬层的内侧与下粘合层进行粘接。
进一步改进,所述的防水层为防水无纺布。
进一步改进,所述的内衬层为经纬交织的聚酰胺纤维。
进一步改进,所述的上粘合层、下粘合层为水玻璃。
进一步改进,所述的聚酯线性低密度聚乙烯绝缘复合无纺布包括聚丙烯树脂层,所述聚丙烯树脂层的外表面固定连接有线性低密度聚乙烯层,所述线性低密度聚乙烯层的外表面固定连接有聚酯纤维层。
进一步改进,所述的屏蔽膜包括铝箔麦拉、聚酯胶粘剂层、珠光膜层和不透明聚酯层,所述铝箔麦拉、透明粘接层、珠光膜层、不透明聚酯层按照从上至下的顺序依次贴合。
进一步改进,所述的抗拉承载线芯由钢芯以及挤包在钢芯外的XLPE护套构成。
与现有技术相比,本发明的有益效果在于:
1、绝缘线芯中采用聚酯线性低密度聚乙烯绝缘复合无纺布,一方面,在聚丙烯树脂层的外表面固定连接有线性低密度聚乙烯层,具有很好的抗张强度、抗撕裂强度、耐环境应力开裂性、耐低温性、耐热性以及耐穿刺性,另一方面,在线性低密度聚乙烯层的外表面固定连接有聚酯纤维层,耐热、耐腐蚀、抗电压、耐电弧性好,能够提升无纺布本体的介电以及耐热性能,解决了现有的用于电缆制造的无纺布,其介电以及耐热性能较差的问题;
2、PP填充绳以及PP带两者相结合,使得电缆具有较高的耐冲击性,机械性质强韧,抗多种有机溶剂和酸碱腐蚀;
3、PVC内护层外表面涂覆隔热保温涂料层,内外表面涂覆有隔热保温涂料的低烟无卤外护套,隔热保温涂料为在高温条件下,起到隔热的作用,防止因高温而导致绝缘线芯丧失功能;隔热保温为改性无机水性涂料,骨白色浆体,涂料固化后比重只有0.46g/ml,具有高效、薄层、隔热保温、装饰、防水、防火、防腐、绝缘于一体的新型太空节能反射隔热保温涂料,本电缆采用内外双重隔热,充分达到隔热效果;
4、双层内护均为PVC材料,第一PVC内护为隔热涂料承载体,以及隔热的缓冲体;第一PVC内护内护为隔热涂料的保护体,防止铠装层破坏涂料层,且生产过程时,应采取抽真空方式生产,使隔热效果更好;
5、电缆的绝缘隔离带包括由外而内设置的防水层、加强层和内衬层,加强层包括上粘合层、下粘合层以及设置在上粘合层和下粘合层之间的绝缘层,防水层的内侧与上粘合层进行粘接,内衬层的内侧与下粘合层进行粘接,其中防水层用于提高本申请的防水防潮效果,加强层用于提高本申请的绝缘效果,内衬层用于提高本申请的耐磨效果;
绝缘层包括聚乙烯、抗氧化剂和交联剂,使用混炼机和硫化机制作;上粘合层和下粘合层为水玻璃,水玻璃是由碱金属氧化物和二氧化硅组合而成的能容易水的一种金属硅酸盐物质,制作时将现有技术中的粘结剂涂覆在绝缘层的上下表面形成上粘合层和下粘合层;水玻璃有良好的粘结能力,硬化时析出的硅酸凝胶,有堵塞毛细孔隙而防止水渗透的作用,不燃烧,在高温下硅酸凝胶干燥得更加强烈,强度并不降低,甚至有所增加,使得绝缘隔离带具有耐热性好,耐酸性强等效果;此外,内衬层为经纬交织的聚酰胺纤维,本结构设计可以有效提高内衬层的耐磨效果,本结构的高强度韧性可以有效提高绝缘隔离带的使用寿命;再加上铝合金联锁铠装,利于防止火焰烧进电缆主体,以及防撞击等功能;
6、屏蔽膜的结构为覆合有铝箔麦拉,屏蔽效果好,抗干扰能力强;同时采用珠光膜层替代传统的拉伸型的PET 材料,质量轻、柔软,易于加工且成本低;铝箔麦拉通过透明的聚酯胶粘剂与珠光膜层相贴合,附合效果好,具有较好的工作稳定性,实用性强,利于广泛推广应用;
7、通过以上的结构的设计和改进,使得电缆的使用寿命由原先的20年增加到70年,并且此电缆在任何恶劣的环境下工作,都不会影响它的性能。
附图说明
图1为本发明的结构示意图;
图2为聚酯线性低密度聚乙烯绝缘复合无纺布的结构示意图;
图3为屏蔽膜的结构示意图;
图4为绝缘隔离带的结构示意图。
具体实施方式
下面将结合本发明实施例中的附图,对本发明实施例中的技术方案进行清楚、完整地描述,显然,所描述的实施例仅仅是本发明一部分实施例,而不是全部的实施例。
在本发明中,除非另有明确的规定和限定,术语“连接”、“固定”等术语应做广义理解,例如,可以是固定连接,或成一体;可以是直接相连,也可以通过中间媒介间接相连。对于本领域的普通技术人员而言,可以根据具体情况理解上述术语在本发明中的具体含义。
如图1所示的一种防火隔热型超高垂直安装用抗拉中压电缆,包括缆芯,所述的缆芯由三根绝缘线芯以及与绝缘线芯数量相同的抗拉承载线芯绞合而成,所述的绝缘线芯由导体以及依次在导体3外设有聚氯乙烯绝缘层4、聚酯线性低密度聚乙烯绝缘复合无纺布5、屏蔽膜6、镀锡铜丝屏蔽层7构成;
在缆芯的间隙处填充表面涂覆有隔热保温涂料的PP填充绳8,在缆芯外绕包PP带9,在PP带外挤包第一PVC内护层10,第一PVC内护层外表面涂覆隔热保温涂料层11,在隔热保温涂料层外挤包第二PVC内护层12,在第二PVC内护层外绕包绝缘隔离带13后包覆铝合金联锁铠装层14,在铝合金联锁铠装层外挤包内外表面涂覆有隔热保温涂料的低烟无卤外护套15;
所述的抗拉承载线芯由钢芯1以及挤包在钢芯外的XLPE护套2构成,抗拉承载线芯分布在电缆的3根线芯之间,其每一根承载线芯的选定应根据电缆的自重,且强度不低于电缆的自重,其该3根分布结构使得电缆的抗拉承载充分提高,安全可靠,其外护材料使用一步法材料生产的XLPE产品的材料,使得电缆的缆芯具有一定的承载和抗拉性;
如图2所示,所述的聚酯线性低密度聚乙烯绝缘复合无纺布5,包括聚厚度为0.5-0.8mm的丙烯树脂层51,所述聚丙烯树脂层的外表面通过粘连剂固定连接有厚度为1-2mm的线性低密度聚乙烯层52,所述线性低密度聚乙烯层的外表面通过粘连剂固定连接有厚度为0.5-1mm的聚酯纤维层53,一方面,在聚丙烯树脂层的外表面固定连接有线性低密度聚乙烯层,具有很好的抗张强度、抗撕裂强度、耐环境应力开裂性、耐低温性、耐热性以及耐穿刺性,另一方面,在线性低密度聚乙烯层的外表面固定连接有聚酯纤维层,耐热、耐腐蚀、抗电压、耐电弧性好,能够提升无纺布本体的介电以及耐热性能,解决了现有的用于电缆制造的无纺布,其介电以及耐热性能较差的问题。
如图3所示,所述的屏蔽膜6包括铝箔麦拉61、聚酯胶粘剂层62、珠光膜层63和不透明聚酯层64,所述铝箔麦拉、透明粘接层、珠光膜层、不透明聚酯层按照从上至下的顺序依次通过粘连剂贴合,其中,铝箔麦拉的厚度为0.5-1mm,透明粘接层的厚度为0.2-0.3mm、珠光膜层的厚度为0.6-0.7mm、不透明聚酯层厚度为0.3-0.5mm,整个屏蔽膜的质量不超过3g,屏蔽效果好,抗干扰能力强;同时采用珠光膜层替代传统的拉伸型的PET 材料,质量轻、柔软,易于加工且成本低;铝箔麦拉通过透明的聚酯胶粘剂与珠光膜层相贴合,附合效果好,具有较好的工作稳定性,实用性强,利于广泛推广应用;较佳的,该不透明聚酯层采用白色不透明聚酯薄膜制成,具有优良的综合性能,进一步提升屏蔽效果;优选的,所述透明的聚酯胶粘剂层,粘接效果更佳,附合效果好,具有较好的工作稳定性,实用性强。
如图4所示,所述的绝缘隔离带13包括由外而内设置的防水层131、加强层和内衬层132,所述加强层包括上粘合层133、下粘合层134以及设置在上粘合层和下粘合层之间的聚乙烯绝缘层135,制作时可以将聚乙烯、抗氧化剂和交联剂陆续加入混炼机中,在160-180℃下混炼15min,然后在开炼机上混炼薄通1-2次,得到胶片,将胶片放置在金属磨具中,置于硫化机上在温度为110-140℃,压力为15MPa条件下,硫化5min,得到聚乙烯绝缘层;上粘合层和下粘合层采用水玻璃、表面活性剂、改性剂,其中水玻璃为80份、表面活性剂为10份和改性剂为10份,水玻璃可以采用模数M为2.0-2.8,密度为1.35-1.5g/cm3,制作时,将粘结剂涂覆在绝缘层的上下表面,形成上粘合层和下粘合层,所述的防水层为防水无纺布,所述的内衬层为经纬交织的聚酰胺纤维,所述防水无纺布的内侧与上粘合层通过粘结剂进行粘接,所述聚酰胺纤维的内侧与下粘合层通过粘结剂进行粘接,其中防水层用于提高本申请的防水防潮效果,加强层用于提高本申请的绝缘效果,内衬层用于提高本申请的耐磨效果。
本发明具体应用途径很多,以上所述仅是本发明的优选实施方式,应当指出,对于本技术领域的普通技术人员来说,在不脱离本发明原理的前提下,还可以作出若干改进,这些改进也应视为本发明的保护范围。
Claims (9)
1.一种防火隔热型超高垂直安装用抗拉中压电缆,其特征在于:包括缆芯,所述的缆芯由多根绝缘线芯以及与绝缘线芯数量相同的抗拉承载线芯绞合而成,在缆芯的间隙处填充表面涂覆有隔热保温涂料的PP填充绳,在缆芯外绕包PP带,在PP带外挤包第一PVC内护层,第一PVC内护层外表面涂覆隔热保温涂料层,在隔热保温涂料层外挤包第二PVC内护层,在第二PVC内护层外绕包绝缘隔离带后包覆铝合金联锁铠装层,在铝合金联锁铠装层外挤包内外表面涂覆有隔热保温涂料的低烟无卤外护套。
2.根据权利要求1所述的防火隔热型超高垂直安装用抗拉中压电缆,其特征在于:所述的绝缘线芯由导体以及依次在导体外设有聚氯乙烯绝缘层、聚酯线性低密度聚乙烯绝缘复合无纺布、屏蔽膜、镀锡铜丝屏蔽层构成。
3.根据权利要求1所述的防火隔热型超高垂直安装用抗拉中压电缆,其特征在于:所述的绝缘隔离带包括由外而内设置的防水层、加强层和内衬层,所述加强层包括上粘合层、下粘合层以及设置在上粘合层和下粘合层之间的聚乙烯绝缘层,所述防水层的内侧与上粘合层进行粘接,所述内衬层的内侧与下粘合层进行粘接。
4.根据权利要求3所述的防火隔热型超高垂直安装用抗拉中压电缆,其特征在于:所述的防水层为防水无纺布。
5.根据权利要求3所述的防火隔热型超高垂直安装用抗拉中压电缆,其特征在于:所述的内衬层为经纬交织的聚酰胺纤维。
6.根据权利要求3所述的防火隔热型超高垂直安装用抗拉中压电缆,其特征在于:所述的上粘合层、下粘合层为水玻璃。
7.根据权利要求2所述的防火隔热型超高垂直安装用抗拉中压电缆,其特征在于:所述的聚酯线性低密度聚乙烯绝缘复合无纺布包括聚丙烯树脂层,所述聚丙烯树脂层的外表面固定连接有线性低密度聚乙烯层,所述线性低密度聚乙烯层的外表面固定连接有聚酯纤维层。
8.根据权利要求2所述的防火隔热型超高垂直安装用抗拉中压电缆,其特征在于:所述的屏蔽膜包括铝箔麦拉、聚酯胶粘剂层、珠光膜层和不透明聚酯层,所述铝箔麦拉、透明粘接层、珠光膜层、不透明聚酯层按照从上至下的顺序依次贴合。
9.根据权利要求1所述的防火隔热型超高垂直安装用抗拉中压电缆,其特征在于:所述的抗拉承载线芯由钢芯以及挤包在钢芯外的XLPE护套构成。
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