CN85107655A - 制造绝热导管的方法 - Google Patents

制造绝热导管的方法 Download PDF

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CN85107655A
CN85107655A CN198585107655A CN85107655A CN85107655A CN 85107655 A CN85107655 A CN 85107655A CN 198585107655 A CN198585107655 A CN 198585107655A CN 85107655 A CN85107655 A CN 85107655A CN 85107655 A CN85107655 A CN 85107655A
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pipe
band edge
thermal insulation
slit
conduit
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格哈特·齐默克
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Kabelmetal Electro GmbH
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    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L59/00—Thermal insulation in general
    • F16L59/14—Arrangements for the insulation of pipes or pipe systems
    • F16L59/143—Pre-insulated pipes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L59/00—Thermal insulation in general
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    • B29C48/0015—Extrusion moulding in several steps, i.e. components merging outside the die producing hollow articles having components brought in contact outside the extrusion die
    • B—PERFORMING OPERATIONS; TRANSPORTING
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Abstract

一种制造绝热导管的方法，一根管子上连续地敷设一根或多根定距绳，一根薄带连续地沿内管的纵向形成缝隙管，锁上缝隙管的纵向带边并使其密不透气，在锁上带边前，在薄带上涂上一种可发泡的塑料混合物(最好以聚氨基甲酸酯或三聚异氰酸酯为基)，这种可发泡的塑料混合物在锁上缝隙管的带边后，可以在内管和外管之间的环形空腔内发泡。为了使缝隙管的纵向接缝特别密封且制造起来简单，可通过摩擦热使互相搭接的带边锁上，摩擦热可借助一个高速旋转的轮子来获得。

Description

本发明涉及一种制造绝热导管的方法，使用此方法时，一根管子上连续地敷设一根或多根定距绳，一根薄带连续地沿内管的纵向形成缝隙管，锁上缝隙管的纵向带边并使其密不漏气，在锁上带边前，在薄带上涂上一种可发泡的塑料混合物（最好以聚氨基甲酸酯或三聚异氰酸酯为基），这种可发泡的塑料混合物在锁上缝隙管的带边后，可以在内管和外管之间的环形空腔内发泡。
从西德公开说明书DE-OS2841934上可以看到，上面所提到的这种绝热导管已各公知，这种绝热导管外侧的泡沫被一层金属箔片所限制，金属箔片的带边可以被粘上。在金属箔片带边的搭接处涂上一层硬化得较慢的粘接剂，通过发泡压力便可将其带边粘上。在这种实施方案中，金属箔片的上面还有一层塑料带，塑料带的带边同样也可粘上。金属箔片的粘接接缝基本上只有一种作用，即改善外皮的扩散紧密性，而塑料带的作用是把发泡时产生的力吸收掉。
本发明任务在于，按下列途径改善上面提到的方法，即在不用附加的粘接剂的情况下，在内管和外管之间的环形空腔发泡之前，就把带子的带边彼此压紧并实现牢固的机械连接。
解决任务的措施如下：互相搭接的带边可通过摩擦热锁上。摩擦热可借助一个高速旋转的轮子来获得。本发明的主要优点在于，该方法能获得一条被限制得很紧凑的、即很狭窄的焊接或粘接接缝。该方法可用于箔片很薄的场合，因为由于轮子转速很高不用较大的压力作用也可获得所需要的摩擦热。如果所用的带子是由金属或塑料制成，则可说“焊接”，如果与此相反，使用的是一个两侧涂有共聚物的铝箔，那宁可说“粘接”。通过摩擦热作用，互相接触的共聚物涂层将变成液状并彼此粘接。
用波纹金属管（最好由铜或不锈钢制成）作为内管，具有特殊的优越性。按本方法制造的绝缘导管非常柔韧，就象一根电缆一样可缠绕在电缆盘上，也可象电缆一样地进行敷设。这样的导管例如可用于远距离加热电缆;由于可敷设的率根导管的长度很长，连接导管的工作量因此也比较小，这是这种导管的一个突出之处。按本发明方法，也同样可将经过软化退火处理过的、无缝拉拔铜管当内管使用。这样的导管可用于装修技术方面，例如可作为热水锅炉和动力输出点之间的连接导管，或用来连接热锅炉和散热器。就这两个使用方面来说，已经证明用两侧涂共聚物的铝箔作带子具有优越性。其优点在于，外皮的塑料层能抗扩散，它一方面能阻止湿气从外面渗入绝缘层，另一方面也能防止工作介质从泡沫塑料层渗出来，如果外皮的塑料层不能抗扩散，那么会使泡沫材料的绝热能力变坏。若使用铝箔，则在较长时间范围内泡沫材料的导热性不会变高。
此外，已经证明，在锁上带边后，在外管上再压上一层由热塑性塑料组成的外皮也是有好处的。这层塑料外皮主要只是用来作为铝箔的抗腐蚀保护层，并基于这个原因可将外皮做得极薄。如果需把按本发明方法制造的导管敷设在地下，本发明推荐的外皮厚度要稍微大一点。对于将涂在共聚物层的铝箔用作带子的场合，压上外皮这一技术特征还有如下优点：由于挤压产生热量，涂在里层的共聚物涂层将与紧挨着它的泡沫相粘接，另一方面涂在外层的共聚物涂层将与热塑性外皮相粘接，这对导管纵向防水性能将有良好的影响。在外管上压出带有往外突出的隔条的外皮，将具有特殊的优越性。通过这种做法可使外皮所耗材料得到节省。
本发明将根据图1至4所示的实施例详述如下：
在一根由一个贮备线圈1放出来的内管2上，以连续工作的方式缠绕上一根定距绳3，定距绳3宜用泡沫塑料绳制成。一根带子5可连续地由一个线圈4上抽出，并围绕在定距绳3的四周形成一个带有搭接带边的缝隙管6。锁上带边之前，可借助一个喷枪7，把一种以聚氨基甲酸酯或三聚异氰酸酯为基的可发泡塑料混合物喷到带子5上去;锁上带边之后，这种可发泡的塑料混合物将填满缝隙管6和内管2之间的环形空腔。通过一个摩擦轮8可把带边锁上，摩擦轮8以高速旋转，它基本上不用压力也可产生出焊接或粘接所需要的热量。待带边锁上以及环形空腔内发泡塑料发泡完毕后，可用一个挤压机9压上外皮10，外皮10色复在缝隙管6上，其材质为热塑性塑料。塑料外皮10硬化后，可将制好的管子绕在电缆盘上，也可切成长段。摩擦轮8是由一种掺有增强剂的合成树脂制成。摩擦轮8的直径约6厘米，与待焊接的管子6的直径无关。摩擦轮8的驱动转数超过5000转/分，最好为25，000转/分数量级。这样高的转速使摩擦轮8能在不用大的压力情况下也产生所需要的热量。
图2所示为图1切下部分的放大视图。从中可以清楚地看出，在搭接带边上的焊接或粘接接缝11极为狭窄。
图3和4所示为按本发明制造绝热导管方法的两个实施例。图3表示一种所谓的远距离加热电缆是。这种远距离加热电缆的内管2，是一种具有纵向焊缝的波纹金属管，最好是由不锈钢制成。螺旋状的定距绳3由泡沫聚氨基甲酸酯制成，与绝缘层12的材质一样。带子5是涂有一层共聚物的铝箔，铝箔厚为0.2毫米。外皮10宜用聚乙烯制成。
图4所示管子是一种绝热的装修管，它由一个无缝控拔铜管2、泡沫聚氨基甲酸酯的定距绳3、以三聚异氰酸酯泡沫为基的绝缘层12、一个涂有一层共聚物的铝箔5（其厚度约0.1毫米）和外皮10（最好由被填充的聚氯乙烯制成）构成。外皮10上有往外突出的隔条13，隔条13使外皮所耗材料总量得以减少。隔条13并没有沿外皮10的整个园周分布，因而管子上留出一块可供印字（例如公司名，或产品名等）的空地方。
按本发明方法制造的导管，在弯曲时不会发生困难，用不着担心粘接或焊接的接缝11会裂开。接缝11很牢固，即使没有辅助的外部支持，它也经得起发泡时绝缘材料12的发泡压力。

Claims (6)

1、制造绝热导管的方法，一根管子上连续地敷设一根或多根定距绳，一根薄带连续地沿内管的纵向形成缝隙管，锁上缝隙管的纵向带边并使其密不透气，在锁上带边前，在薄带上涂上一种可发泡的塑料混合
物(最好以聚氨基甲酸酯或三聚异氰酸酯为基)，这种可发泡的塑料混
合物在锁上缝隙管的带边后，可以在内管和外管之间的环形空腔内发泡，其特征在于：
互相搭接的带边可通过摩擦热锁上，摩擦热可借助一个高速旋转的轮子来获得。
2、按权利要求1的制造绝热导管的，其特征在于：用一根波纹金属管（最好由铜或不锈钢制成）作为内管。
3、按权利要求1的制造绝热导管的方法，其特征在于：用一根经过软化退火处理过的无缝拉拔铜管作为内管。
4、按权利要求1至3中一个或多个权利要求的制造绝缘导管的方法，其特征在于：用两侧涂有共聚物涂层的铝箔作为带子。
5、按权利要求1至4中一个或多个权利要求的制造绝热导管的方法，其特征在于：锁上带边之后，在外管上压上一层由热塑性塑料组成的外皮。
6、按权利要求5的制造绝热导管的方法，其特征在于：在外管上，压出一个带有往外突出的隔条的外皮。
CN198585107655A 1985-02-22 1985-10-17 制造绝热导管的方法 Pending CN85107655A (zh)

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CN109263095A (zh) * 2018-11-21 2019-01-25 天津市锦业科技有限公司 多功能聚氨酯连续浇注聚乙烯保温管生产线

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CN104339612A (zh) * 2014-11-03 2015-02-11 安徽天元电缆有限公司 一种电缆用退火挤出一体机
CN109263095A (zh) * 2018-11-21 2019-01-25 天津市锦业科技有限公司 多功能聚氨酯连续浇注聚乙烯保温管生产线

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SE8600746L (sv) 1986-08-23
SE8600746D0 (sv) 1986-02-19
FR2578026A1 (fr) 1986-08-29
NL8600445A (nl) 1986-09-16
DE3506144A1 (de) 1986-08-28
DK73186D0 (da) 1986-02-14
IT8523311A0 (it) 1985-12-20
DK73186A (da) 1986-08-23

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