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pressure maintaining system
相关语句
  保压系统
    The water filling and pressure maintaining system mainly included:pressure pump and its control device, blockage end at the spiral case inlet, sealing ring on the stay ring of turbine, etc.
    蜗壳内充水保压系统 ,主要包括加压水泵及其控制装置、蜗壳进口闷头、座环密封环等组成。
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The spiral cases of the Three Gorges hydropower stations turbines are of large scale water passing steelwork components, and also important concealed ones. Based on research results, a construction method of filling spiral cases with water and regulating water pressure and water temperature in them was used to place the concrete surrounding the spiral cases, with the water pressure in the spiral cases maintained at 700 kPa and water temperature at 16~22℃. The water filling and pressure...

The spiral cases of the Three Gorges hydropower stations turbines are of large scale water passing steelwork components, and also important concealed ones. Based on research results, a construction method of filling spiral cases with water and regulating water pressure and water temperature in them was used to place the concrete surrounding the spiral cases, with the water pressure in the spiral cases maintained at 700 kPa and water temperature at 16~22℃. The water filling and pressure maintaining system mainly included:pressure pump and its control device, blockage end at the spiral case inlet, sealing ring on the stay ring of turbine, etc. In order to prevent the spiral cases from excessive deformation in water filling process, the increase and maintenance of water pressure were conducted in stages. Due to huge size of the spiral cases, changes of water temperature in them also had obvious influence on their deformation beside the influence of water pressure, A water temperature increment of 1℃ was equivalent to a water pressure increment of about 20 kPa. Therefore in winter the water in spiral cases was heated when its temperature was lower than 16℃, and in summer cool water was used when water temperature was higher than 22℃. The water pressure and water temperature in spiral cases were strictly controlled during the process of placing concrete surrounding spiral cases. Over one year of construction practice has proved that adopting the water filling and pressure maintaining system and taking some temperature maintaining measures satisfied the construction requirements.

蜗壳是三峡电站水轮机的大型过流和重要隐蔽部件 ,经研究采用充水保压保温方式浇筑混凝土埋设 ,要求蜗壳内水压力为 70 0kPa ,水温为 16~ 2 2℃。蜗壳内充水保压系统 ,主要包括加压水泵及其控制装置、蜗壳进口闷头、座环密封环等组成。为防止蜗壳在充水加压过程中产生过度变形 ,采用分段加压和保压的方式。由于三峡电站水轮机蜗壳尺寸巨大 ,除蜗壳内水压对其变形有影响外 ,蜗壳内水温的变化对其变形也有明显影响。水温升高 1℃ ,相当于蜗壳内水压增加约 2 0kPa。因而冬季水温低于 16℃ ,可采取对水加热 ,而夏季 ,当水温高于 2 2℃时 ,可采取冷水降温。对蜗壳在混凝土浇筑过程中的水压和水温控制严格要求 ,经过 1a多的实践证明 ,采用保压系统并采取保温措施 ,满足了施工要求。

 
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