CN117053083B - 一种耐压抗低温的密封膜及围护系统 - Google Patents
一种耐压抗低温的密封膜及围护系统 Download PDFInfo
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Abstract
本发明涉及一种耐压抗低温的密封膜及围护系统,包括底部平面区域、相对底部平面区域凸出的波纹,波纹正交相交设置;波纹正交相交的中心设有类马鞍形的节点,波纹与节点连接处形成节点的高位,高位高于波纹的外轮廓顶点,节点沿高位朝波纹正交相交的中心平滑下凹形成低位,低位高于底部平面区域;将该密封膜搭接焊接形成完整的密封层安装在绝缘层用于围护系统。本发明的密封膜在波纹正交相交处设置了类马鞍形的节点,节点在正交相交的中心形成低位,节点与波纹连接处则形成高位,这样的形状设计增强了波纹连接处的刚度,同时中心的低位使其承压向下变形收到抑制,耐压抗变形能力比现有的Mark III的波纹节形式更好。
Description
技术领域
本发明涉及低温运输领域,具体涉及一种耐压抗低温的密封膜及围护系统。
背景技术
天然气作为以甲烷为主要成分的能源因其较低的污染性得到广泛地应用,海上运输该天然气主要通过将其液化从而在船上进行储存,天然气在低温(约-163℃)情况下能够自然液化,其体积缩小为气态的1/600。同样,岸上要接收液化的天然气则需配置有能够存储该低温液化气体的储罐。
传统的陆用储罐和船用存储系统采用有独立型、薄膜型和C型围护系统。其中,独立型围护系统通过直接采用大厚度的耐低温钢板(如9镍钢板等)作为低温液体和液化气体的货舱周界。薄膜型围护系统采用耐低温非金属材料作为隔绝传热的绝缘层,由一层金属的薄膜直接与低温液体和液化气体接触。C型围护系统则直接对气体加压,使其的液化温度提高,其罐体通常无法做的很大。薄膜型围护系统由于其重量低、舱容利用率高,从而在大型储罐、运输船上占据诸如成本等方面的优势。
目前常见的薄膜型围护系统以法国GTT公司的NO96型和Mark III型围护系统为主。NO96型采用平直的殷瓦钢作为金属薄膜,而Mark III型则采用304L不锈钢作为材质设计了独特的凸起部形成了金属波纹板,304L不锈钢采用褶皱形式的波纹(《304L波纹板在LNG薄膜罐上的应用》,蒋小波,魏明,邢乐,杜宇,陈念来,胡承杰,中国石油和化工标准,第13期,2023年7月11日)。
由于Mark III型的不锈钢波纹板过于独特的波纹节形状,为了改善其承压性能,还需要额外在其底下设计有楔块进行加强。
发明内容
为了提升波纹板的耐压性能,本发明提供了一种耐压抗低温的密封膜及围护系统,通过马鞍形波纹节的设计增强了耐压性能的同时无需额外增加楔块进行加强。
本发明的技术目的是通过以下技术方案实现的:
一种耐压抗低温的密封膜,包括底部平面区域、相对底部平面区域凸出的波纹,波纹正交相交设置;波纹正交相交的中心设有类马鞍形的节点,波纹与节点连接处形成节点的高位,高位高于波纹的外轮廓顶点,节点沿高位朝波纹正交相交的中心平滑下凹形成低位,低位高于底部平面区域。
进一步地,节点的高位到低位呈锥形。
进一步地,波纹包括顶部曲线面、中部直线面和底部过渡圆弧面,所述中部直线面对称设置在顶部曲线面的两侧,底部过渡圆弧面连接中部直线面和底部平面区域。
进一步地,顶部曲线面的顶点距离底部平面区域的距离在50-65mm,顶部曲线面两侧底部过渡圆弧面与底部平面区域相交的位置之间的距离在80-120mm。
进一步地,顶部曲线面的弧面半径在10-20mm,底部过渡圆弧面的弧面半径在6-15mm。
进一步地,中部直线面和底部平面区域之间的夹角为65°-80°。
进一步地,节点高位至低位处的斜率小于波纹侧面的斜率,低位处的斜率为0。
进一步地,密封膜材质为高强度不锈钢板或铝合金板,密封膜材质的屈服强度大于300MPa、抗拉极限大于600MPa。
进一步地,密封膜的厚度为1.0-2.5mm。
进一步地,密封膜的长度和宽度比为2:1,每个密封膜上沿长度方向至少包括六个波纹均匀排列,每个密封膜上沿宽度方向至少包括三个波纹均匀排列。
进一步地,波纹、节点和底部平面区域为一体结构,波纹和节点挤压成型。
本发明还提供了一种薄膜型围护系统,包括绝缘层、密封层,密封层安装在绝缘层上,密封层包括若干密封膜,相邻的密封膜之间搭接焊接,密封膜如上述的耐压抗低温的密封膜。
相比于现有技术,本发明的有益效果在于:
1、本发明的密封膜在波纹正交相交处设置了类马鞍形的节点,节点在正交相交的中心形成低位,节点与波纹连接处则形成高位,这样的形状设计增强了波纹连接处的刚度,同时中心的低位使其承压向下变形收到抑制,耐压抗变形能力比现有的Mark III的波纹节形式更好。
2、本发明中波纹的两侧设有中部直线面,相比与现有技术中波纹均为圆弧的情况更便于加工和矫正,顶部曲线面和底部过渡圆弧面的设置使其能够很好地承受冷热交替产生的热载荷。
3、本发明中密封膜的波纹和节点采用挤压成型,波纹、节点和底部平面区域为一体结构相比于采用冲压成型,本发明的密封膜各处基本没有减薄,可以保证密封膜各处厚度的一致性。
附图说明
图1是本发明的耐压抗低温的密封膜结构示意图。
图2是本发明中波纹正交相交处的单个节点俯视图。
图3是本发明中波纹正交相交处单个节点的侧面局部剖视图。
图4是本发明中波纹外轮廓线示意图。
图5是本发明中密封膜搭接示意图。
图6为现有的Mark III型的波纹板的受力变形分布图。
图7是本发明中的密封波的受力变形分布图。
图8为现有的Mark III型的波纹板的应变云图。
图9为本发明的密封膜的应变云图。
图中,1、密封层;2、密封膜;3、底部平面区域;4、波纹;5、节点;6、低位;7、连接处;8、高位;9、外轮廓顶点;10、顶部曲线面;11、中部直线面;12、底部过渡圆弧面;13、焊接空间。
具体实施方式
下面结合具体实施方式对本发明的技术方案进行进一步描述:
一种耐压抗低温的密封膜,如图1-图3所示,包括底部平面区域3、相对底部平面区域3凸出的波纹4,波纹4正交相交设置;波纹4正交相交的中心设有类马鞍形的节点5,波纹4与节点5连接处7形成节点5的高位8,高位8高于波纹4的外轮廓顶点9,节点5沿高位8朝波纹正交相交的中心平滑下凹形成低位6,低位6高于底部平面区域3,本实施例中,低位高出平面区域8mm。
具体地,波纹4包括顶部曲线面10、中部直线面11和底部过渡圆弧面12,中部直线面11对称设置在顶部曲线面10的两侧,底部过渡圆弧面12连接中部直线面11和底部平面区域3。
其中,顶部曲线面10的顶点距离底部平面区域3的距离H的值为50-65mm,顶部曲线面10两侧的底部过渡圆弧面12与底部平面区域3相交的位置之间的距离B的值在80-120mm;顶部曲线面10的弧面半径在R1为10-20mm,底部过渡圆弧面12的弧面半径R2在6-15mm;中部直线面11和底部平面区域3之间的夹角a的大小为65°-80°,如图4所示。节点的高位8到低位6呈锥形,节点高位8至低位6处的斜率小于波纹4侧面的斜率,低位6处的斜率为0。
密封膜材质为高强度不锈钢板或铝合金板,密封膜材质的屈服强度大于300MPa、抗拉极限大于600MPa,具有良好的延展性;密封膜的厚度在1.0-2.5mm。本实施例中H为60mm,宽度为120mm,R1=20mm,R2=15mm,a=65°,密封膜的厚度为2mm。
密封膜的长度和宽度比为2:1,密封面的长度为每个密封膜上沿长度方向至少包括六个波纹4均匀排列,每个密封膜上沿宽度方向至少包括三个波纹4均匀排列。本实施例中每个密封膜的长度至少为2.4m,宽度至少为1.2m,作为一种实施例,长度为2.4m宽度为1.2m,沿长度方向设置6排波纹,沿宽度方向设置3排波纹,如图1所示。
本发明中波纹、节点和底部平面区域为一体结构,波纹和节点挤压成型,相比与冲压成型,挤压不会改变膜的厚度,可以保证膜的各处厚度保持一致。
具体加工时,包括以下步骤:
步骤1、按照波纹的外轮廓形状,分别制作波纹的模具和类马鞍形的节点的模具,并设计矫正工装;
步骤2、对采购的金属板进行加工,通过挤压成型的方式依次在长度方向和宽度方向做出正交相交的波纹和正交相交位置的节点;
步骤3、根据波纹的模具和类马鞍形的节点的模具,对挤压成型的波纹和节点进行加工矫正,使其最终的外形符合波纹区域的外轮廓线形状要求以及节点的形状要求,依照设定的长宽参数对金属板进行切割,对搭接位置预留焊接空间13。
本发明还提供了一种薄膜型围护系统,包括绝缘层、密封层1,密封层1采用上述的密封膜2进行搭接焊接,如图5所示,相邻的密封膜2之间在焊接空间13处搭接焊接,焊接完成后形成储罐内部完整的密封层。
为了更好的证明本申请的波纹板的力学特性,分别对本申请的波纹板和现有的Mark III的褶皱式波纹板进行力学模拟,如图6和图7所示,图6为现有的Mark III型的波纹板的受力变形分布图,图7是本发明中的密封波的受力变形分布图。从图中可以看到,MarkIII型的波纹板的最大变形约为0.366mm,同等压力下本申请的密封膜的最大变形约为0.294mm,变形缩小约20%。图8为现有的Mark III型的波纹板的应变云图,图9为本发明的密封膜的应变云图,从图中可以看到,现有的Mark III型的波纹板的最大应变为1.37mm/m,本申请的密封膜的最大应变为1.03mm/m,最大应变减小了约25%。
本实施例只是对本发明的进一步解释,并不是对本发明的限制,本领域技术人员在阅读完本说明书后可以根据需要对本实施例做出没有创造性的修改,但是只要在本发明的权利要求范围内都受到专利法的保护。
Claims (12)
1.一种耐压抗低温的密封膜,其特征在于,包括底部平面区域、相对底部平面区域凸出的波纹,所述波纹正交相交设置;所述波纹正交相交的中心设有类马鞍形的节点,所述波纹与节点连接处形成节点的高位,高位高于波纹的外轮廓顶点,所述节点沿高位朝波纹正交相交的中心平滑下凹形成低位,所述低位高于底部平面区域。
2.根据权利要求1所述的一种耐压抗低温的密封膜,其特征在于,所述节点的高位到低位呈锥形。
3.根据权利要求1所述的一种耐压抗低温的密封膜,其特征在于,所述波纹包括顶部曲线面、中部直线面和底部过渡圆弧面,所述中部直线面对称设置在顶部曲线面的两侧,所述底部过渡圆弧面连接中部直线面和底部平面区域。
4.根据权利要求3所述的一种耐压抗低温的密封膜,其特征在于,所述顶部曲线面的顶点距离底部平面区域的距离在50-65mm,所述顶部曲线面两侧底部过渡圆弧面与底部平面区域相交的位置之间的距离在80-120mm。
5.根据权利要求3所述的一种耐压抗低温的密封膜,其特征在于,所述顶部曲线面的弧面半径在10-20mm,所述底部过渡圆弧面的弧面半径在6-15mm。
6.根据权利要求3所述的一种耐压抗低温的密封膜,其特征在于,所述中部直线面和底部平面区域之间的夹角为65°-80°。
7.根据权利要求2所述的一种耐压抗低温的密封膜,其特征在于,所述节点高位至低位处的斜率小于波纹侧面的斜率,所述低位处的斜率为0。
8.根据权利要求1所述的一种耐压抗低温的密封膜,其特征在于,所述密封膜材质为高强度不锈钢板或铝合金板,所述密封膜材质的屈服强度大于300MPa、抗拉极限大于600MPa。
9.根据权利要求8所述的一种耐压抗低温的密封膜,其特征在于,所述密封膜的厚度为1.0-2.5mm。
10.根据权利要求1所述的一种耐压抗低温的密封膜,其特征在于,所述密封膜的长度和宽度比为2:1,每个所述密封膜上沿长度方向至少包括六个波纹均匀排列,每个所述密封膜上沿宽度方向至少包括三个波纹均匀排列。
11.根据权利要求1所述的一种耐压抗低温的密封膜,其特征在于,所述波纹、节点和底部平面区域为一体结构,所述波纹和节点挤压成型。
12.一种薄膜型围护系统,其特征在于,包括绝缘层、密封层,所述密封层安装在绝缘层上,所述密封层包括若干密封膜,相邻的所述密封膜之间搭接焊接,所述密封膜如权利要求1-11任意一项所述的耐压抗低温的密封膜。
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