CN107614734B - 冷却滚筒及其制造方法 - Google Patents
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Abstract
一种冷却滚筒(1),其为在内部配设有多个冷却管(8)的圆筒体(2)内封入重复进行蒸发和冷凝的工作流体而成,在上述圆筒体(2)的内周面上形成有金属皮膜(9)。
Description
技术领域
本发明涉及一种冷却滚筒及其制造方法,更详细而言,涉及一种在合成树脂等各种片材或各种膜的制造装置或者积层这些各种片材或各种膜的层压装置等中所使用的冷却滚筒及其制造方法。
背景技术
一般而言,在使合成树脂膜贴合于纸等基材的层压制造装置中,例如,如图10所示,使从供给滚筒21卷出的基材22通过按压滚筒23与冷却滚筒24之间,并卷取至卷取滚筒25,另一方面,在按压滚筒23与冷却滚筒24之间,使熔融树脂从模嘴26流下而形成膜层28,并利用冷却滚筒24进行冷却的同时贴合于基材22,由此制造层压积层纸29。
作为上述冷却滚筒24,例如,在专利文献1中公开了如下结构:在将多根冷却用传热管配设于内部的圆筒体内,封入工作流体(热传导液),通过重复进行工作流体在旋转驱动的上述圆筒体内的蒸发和冷凝而对上述圆筒体的表面进行冷却。
另外,可通过在封入工作流体的圆筒体的内表面上张紧设置毛细结构芯以实现温度的均匀化而同样进行冷却。
专利文献1:日本公开专利平04-2720号公报
发明内容
在如上所述的冷却滚筒中,要求进一步提高冷却能力,本发明的目的在于提供一种提高冷却能力的冷却滚筒及其制造方法。
为了达到上述目的,本发明的冷却滚筒具备将供冷却流体流通的多个冷却管配设于内部的圆筒体,且在该圆筒体内封入重复进行蒸发和冷凝的工作流体,其中,上述冷却滚筒在上述圆筒体的内周面上形成有金属皮膜,上述金属皮膜为通过熔射加工而形成的熔射皮膜,上述金属皮膜具有保持上述工作流体的气孔。
优选上述熔射皮膜的气孔率为3%以上。
优选上述熔射皮膜为Al皮膜。
根据本发明的冷却滚筒,由于通过熔射加工等而在圆筒体的内周面上形成作为Al皮膜等金属皮膜的熔射皮膜,上述熔射皮膜具有保持工作流体的气孔,因此如后述,与在圆筒体的内周面上实施毛细结构芯加工的现有例相比能提高沸腾传热系数,从而能提高冷却效率。
本发明的冷却滚筒的制造方法是如下冷却滚筒的制造方法,该冷却滚筒具备将供冷却流体流通的多个冷却管配设于内部的圆筒体,且在该圆筒体内封入重复进行蒸发和冷凝的工作流体,其中,上述冷却滚筒的制造方法通过熔射加工而在上述圆筒体的内周面上形成金属皮膜,上述金属皮膜具有保持上述工作流体的气孔。
根据本发明的冷却滚筒的制造方法,由于通过熔射加工而在圆筒体的内周面上形成金属皮膜,上述金属皮膜具有保持工作流体的气孔,因此如后述,与在圆筒体的内周面上实施毛细结构芯加工的现有例相比能提高沸腾传热系数,从而能提高冷却效率。
根据本发明,由于通过熔射加工而在圆筒体的内周面上形成具有气孔的熔射皮膜,因此能提高冷却滚筒的冷却效率。
附图说明
图1是本发明的实施方式的冷却滚筒的示意性纵剖视图。
图2是图1的A-A线剖视图。
图3是图2的局部放大剖视图。
图4是对冷却滚筒进行模拟的试验装置的示意性结构图。
图5是表示通过图4的试验装置而获得的实施例和比较例的沸腾传热系数的图。
图6是使用试验用滚筒的试验设备的示意性结构图。
图7是表示图6的试验用滚筒及加热器的图。
图8是表示通过图6的试验设备而获得的实施例和比较例的试验用滚筒的沸腾传热系数的图。
图9是表示通过图6的试验设备而获得的实施例和比较例的试验用滚筒的沸腾传热系数的图。
图10是层压积层纸的制造装置的示意图。
具体实施方式
下面,基于附图,对本发明的实施方式进行详细说明。
图1是本发明的一实施方式的冷却滚筒的示意性纵剖视图,图2是沿着图1的A-A线的剖视图,图3是图2的局部放大剖视图。
参照这些图,该实施方式的冷却滚筒1为例如用于上述图10的层压制造装置等中的冷却滚筒。该冷却滚筒1具备板厚比较薄的圆筒体2及支撑该圆筒体2的中空支撑轴3。在圆筒体2的两端部固定有将圆筒体2的内部密封的端板17、18,并且,在比端板17、18更靠圆筒体2的内侧固定有将内部密封的其它面板4、5。
上述支撑轴3以气密状态贯通两端板17、18及两面板4、5的中心,该支撑轴3的两端部3a、3b向圆筒体2的外侧突出。
在圆筒体2的一端侧,通过内侧的面板4和外侧的端板17而划分冷却水的入口室6,如箭头所示,从中空支撑轴3的一端3a供给的冷却水被导入至入口室6内。
在圆筒体2的另一端侧,通过内侧的面板5和外侧的端板18而划分冷却水的出口室7,该出口室7与中空支撑轴3的另一端3b连通,并如箭头所示,构成冷却水的排出路径。
在两面板4、5间沿着圆周方向并列设置有多根冷却管8,上述多根冷却管8沿圆筒体2的轴线方向(图1的左右方向)延伸且与入口室6及出口室7分别连通。
由此被构造为,从支撑轴3的一端3a导入至入口室6内的冷却水被分配至各冷却管8,在各冷却管8内流动的冷却水从出口室7经由支撑轴3的另一端3b而排出。
由两面板4、5划分的圆筒体2的内部为减压状态,并且封入有如氢氟氯碳化物、萘、喹啉等重复进行蒸发和冷凝的作为工作流体的工作液(未图示)。
在该结构中,当封入至旋转的圆筒体2内的工作液通过离心力而与圆筒体2的内周面接触时,通过来自与该圆筒体2的外周面接触的高温树脂膜等被冷却片材的热而蒸发上述工作液,经蒸发的工作液通过与各冷却管8接触而被冷却,并冷凝且液化。该经液化的工作液再次通过离心力而返回至圆筒体2的内周面,并重复进行通过来自被冷却片材的热而蒸发工作液这一蒸发和冷凝,从而进行被冷却片材的冷却。
在该实施方式中,为了提高冷却效率,在圆筒体2的内周面上形成有金属皮膜9,而并非如上述专利文献1那样张紧设置毛细结构芯。
优选该金属皮膜9为通过熔射加工而形成于圆筒体2的内周面的整个面上的熔射皮膜。优选该金属皮膜9的膜厚为1mm以下,更优选为500μm以下,进一步优选为100~400μm,在该实施方式中,该金属皮膜9的膜厚为250μm左右。若该膜厚超过1mm,则无法充分提高传热率。
如果金属皮膜9的材料为金属或其合金,则其种类并不特别限定,但优选用作熔射材料的、例如Al、Al合金、SUS、锌等。
用于形成金属皮膜9的熔射加工方法并不特别限定,例如可列举电弧熔射,该实施方式的金属皮膜9为通过电弧熔射而形成的Al熔射皮膜。
由于金属皮膜9为通过熔射加工而形成的熔射皮膜,因此具有气孔,可将工作流体保持于气孔内。因此,可将工作液保持于圆筒体2的内周面的金属皮膜9的气孔中,由此,能够将圆筒体2的外周面均匀地冷却。优选该气孔率为3%以上,更优选为5%以上。
实施例
其次,基于实施例及比较例对本发明的作用效果进行说明。
关于实施例,与上述实施方式相同,在试验片的表面(沸腾表面)上通过电弧熔射加工而形成膜厚250μm左右的Al金属皮膜。
关于比较例,在试验片的表面(沸腾表面)上实施毛细结构芯加工。该毛细结构芯加工是与本申请人出售的现有冷却滚筒相同的毛细结构芯加工。
通过图4所示的对冷却滚筒进行模拟的试验装置而测定实施例及比较例的试验片的沸腾传热系数。
在图4中,10为沸腾容器,11为试验片,12为冷凝器,13为工作液用的热电偶,14为加热器,15为试验片用的热电偶,16为工作液。工作液16使用R-123氢氟氯碳化物,并按照如下的顺序分别进行测定。
使沸腾容器10内为真空状态,并封入30~60ml工作液16。利用加热器14从试验片11的背面侧加热试验片11,并使工作液16从试验片11的沸腾表面沸腾并蒸发的同时,使沸腾容器10内的压力上升至正压,抽出停留于沸腾容器10的上部的不冷凝气体,并将沸腾容器10内密闭。
然后,在使冷却水循环而成为平衡状态时,测定冷却水的入口、出口及试验片11的温度。工作液16的深度在沸腾状态下为约15mm。
沸腾传热系数为相对于热流通量(heat flux)的沸腾传热系数,试验片11的沸腾表面的温度通过设置于各点的热电偶15的温度差而求出。热流通量(heat flux)及沸腾传热系数使用以下式(1)、(2)来求出。
q=V×Cpw×ρw×(Tw'-Tw)/A (1)
hb=q÷(Ts-Tl) (2)
此外,在上述式(1)、(2)中,q为热流通量[kcal/m2h],V为冷却水量[m3/h],Cpw为冷却水的比热[kcal/kg℃],ρw为冷却水的密度[kg/m3],Tw'为冷却水的出口温度[℃],Tw为冷却水的入口温度[℃],A为工作液的沸腾传热面积[m2],hb为工作液的沸腾传热系数[kcal/m2h℃],Ts为沸腾表面温度[℃],Tl为工作液温度[℃]。
将根据上述顺序测定出的结果示于图5。在图5中,实线表示实施例,虚线表示比较例。
如图5所示,实施例的试验片的沸腾传热系数高于比较例的试验片的沸腾传热系数。
由此可知,通过电弧熔射加工而在表面上形成有膜厚250μm左右的Al金属皮膜的实施例的试验片与在表面上实施与本申请人出售的现有冷却滚筒相同的毛细结构芯加工的比较例的试验片相比,实施例的试验片的沸腾传热系数提高,从而冷却效率提高。
另外,作为试验用滚筒,制作实施例及比较例的冷却滚筒,并对各冷却滚筒测定沸腾传热系数。
关于实施例的冷却滚筒,与上述实施方式相同地通过电弧熔射加工而在圆筒体的内周面上形成有膜厚250μm左右的Al金属皮膜。
关于比较例的冷却滚筒,在圆筒体的内周面上实施毛细结构芯加工。该毛细结构芯加工为与本申请人出售的现有冷却滚筒相同的毛细结构芯加工。
关于实施例及比较例的冷却滚筒的沸腾传热系数,分别使用两种工作液即氢氟氯碳化物R-124、R-134a并利用图6所示的试验设备测定沸腾传热系数。
在图6中,30为实施例或比较例的冷却滚筒即试验用滚筒,31、32为分别测量流向试验用滚筒30的冷却水的入口及出口温度的第一温度计及第二温度计,33为测量冷却水的流量的流量计,34为冷却水泵,35为将试验用滚筒30旋转驱动的马达,37~41为在沿着试验用滚筒30的轴线方向(图6的左右方向)的不同位置分别测量试验用滚筒30的表面温度的第一表面温度计~第五表面温度计。
如后述,试验用滚筒30通过图7所示的加热器36而加热。该加热器36及上述马达35通过图6的控制盘42而控制。
在该试验设备中,通过马达35而使试验用滚筒30以64rpm旋转,通过冷却水泵34而使冷却水以21.5m3/h的流量在试验用滚筒30内循环,通过加热器36而加热试验用滚筒30的外面。然后,在成为平衡状态时,利用第一温度计及第二温度计31、32分别测量冷却水的入口温度及出口温度。试验用滚筒30的表面温度利用第一表面温度计~第五表面温度计37~41来分别测量,并设为这些表面温度的平均值。
基于由试验设备所获得的测量值,使用下述式(3)~(7)求出热流通量(heatflux)及沸腾传热系数。
H=V×(T2-T1)×ρw×Cpw (3)
θm=[(T0-T1)-(T0-T2)]/In[(T0-T1)/(T0-T2)] (4)
U=H/(Ao×θm) (5)
q=H/Ao (6)
1/U=Ao/(Ai×h)+Rt (7)
在上述式(3)~(7)中,T2为冷却水的出口温度[℃],T1为冷却水的入口温度[℃],T0为滚筒表面温度的平均值[℃],U为综合传热系数[kcal/m2h℃],Ao为滚筒外面的传热面积[m2],Ai为滚筒内表面的传热面积[m2],h为沸腾传热系数[kcal/m2h℃],Rt为除沸腾以外的滚筒的传热阻力的合计,q、V、ρw、Cpw与上述图4中的上述式(1)的说明相同。
利用上述式(3)~(5),算出综合传热系数U,通过利用上述式(7)倒算而算出沸腾传热系数h。利用由式(7)算出的沸腾传热系数h和式(6)的热流通量q来制作图8、图9。
图8是工作液为R-124的情况,图9是工作液为R-134a的情况。在图8及图9中,均用实线表示实施例,用虚线表示比较例。
如图8及图9所示,可知关于任一种工作液,实施例的试验用滚筒的沸腾传热系数高于比较例的试验用滚筒的沸腾传热系数,从而冷却效率提高。
附图标记说明
1:冷却滚筒
2:圆筒体
3:支撑轴
6:入口室
7:出口室
8:冷却管
9:金属皮膜
Claims (2)
1.一种冷却滚筒,具备将供冷却流体流通的多个冷却管配设于内部的圆筒体,且在该圆筒体内封入重复进行蒸发和冷凝的工作流体,上述冷却滚筒的特征在于,
在上述圆筒体的内周面上形成有金属皮膜,
上述金属皮膜为通过熔射加工而形成的熔射皮膜,上述金属皮膜具有保持上述工作流体的气孔,
上述熔射皮膜的气孔率为3%以上。
2.一种冷却滚筒,具备将供冷却流体流通的多个冷却管配设于内部的圆筒体,且在该圆筒体内封入重复进行蒸发和冷凝的工作流体,上述冷却滚筒的特征在于,
在上述圆筒体的内周面上形成有金属皮膜,
上述金属皮膜为通过熔射加工而形成的熔射皮膜,上述金属皮膜具有保持上述工作流体的气孔,
上述熔射皮膜为Al皮膜。
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