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    • 2. 发明授权
    • Cable molding method
    • 电缆成型法
    • US4091062A
    • 1978-05-23
    • US541298
    • 1975-01-15
    • Arthur L. Nelson
    • Arthur L. Nelson
    • B29C33/00B29C37/00B29C45/14B29C45/46H01B13/10H02G1/14H02G1/16B29C6/00
    • H01B13/103B29C33/0044B29C37/005B29C45/14549B29C45/46H02G1/145H02G1/16B29C2045/14557Y10S425/13Y10S425/223
    • A method and apparatus for forming cured polyethylene insulation about high voltage cables by applying uncured polyethylene around a core of the cable. The polyethylene is heated, cured and then cooled to room temperature in a pressurized nitrogen gas atmosphere. In one form the molding apparatus comprises first and second mold forms which define a cavity and which include means for heating the mold halves to the polyethylene curing temperature. Means is also provided to introduce the pressurized nitrogen into the cavity and for subjecting cable portions that extend beyond the mold to pressurized nitrogen until such cable portions are sufficiently cooled to prevent their deformation under pressure, to prevent the oxidation of polyethylene and/or to prevent the formation of voids or enclosures. In another embodiment, the apparatus includes cooling openings for receiving a coolant preselectedly along the molding apparatus, a number of spaced-apart temperature gauges for indicating temperature at various locations along the apparatus, a pressure gauge for indicating pressure in the mold cavity, a heat source and a nitrogen source. At each end of the apparatus are recesses in which soft resilient strips are located. During the molding process, the ends of the molding apparatus are kept at a reduced temperature and the pressure in the mold cavity is varied, the nitrogen being used to pressurize the mold cavity during curing. This method insures a quality repair or splice without detracting from the quality of the cable.
    • 一种用于通过在电缆的芯部周围施加未固化的聚乙烯来形成关于高压电缆的聚乙烯绝缘的方法和装置。 将聚乙烯加热,固化,然后在加压氮气气氛中冷却至室温。 在一种形式中,模制设备包括限定空腔的第一和第二模具形式,并且包括用于将半模加热到聚乙烯固化温度的装置。 还提供了将加压的氮气引入空腔中并且用于使延伸超过模具的电缆部分经受加压氮气直到这种电缆部分被充分冷却以防止其在压力下变形以防止聚乙烯氧化和/或防止的装置 形成空隙或外壳。 在另一个实施例中,该装置包括冷却开口,用于沿模制设备预先接收冷却剂,多个间隔开的温度计,用于指示沿设备的不同位置的温度,用于指示模腔中的压力的​​压力计, 来源和氮源。 在设备的每一端是软弹性条所在的凹槽。 在成型过程中,模制装置的端部保持在降低的温度并且模腔中的压力改变,氮在用于在固化期间对模腔加压。 这种方法确保质量修复或拼接,而不会降低电缆的质量。