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定压补水装置在中央空调系统中运用

定压补水装置在中央空调系统中运用
2016-11-21 11:37:00来源:中南机电工程有限公司编辑:niuchuang 分享到: 转发到新浪微博 腾讯微博

  定压补水装置的运用领域广泛,主要有:工业用水:日供水量为50~1200吨;生活用水:可供60~12000户居民用水;中央空调冷冻水循环恒压补水和消防供水;农村喷灌系统和自建的自来水供水系统;旧有供水系统(水塔、高位水箱等)的改造。其中最为重要的的一个运用就是中央空调系统中的运用。
  中央空调系统的定压点均设在冷冻水泵的入口的回水干管上,这样可以使水泵产生的压头在系统中得到合适的分布,目前中央空调系统定压补水方式主要有膨胀水箱定压补水,补水泵定压补水,气体定压罐结合补水泵定压补水等,其中膨胀水箱定压补水是最经济最简单的方式,所以现在在民用建筑中大量使用,但是膨胀水箱必须设在系统的最高点,安装困难,管理不方便,使高位水箱的应用受到了限制。
  利用补水泵连续补水定压的系统,其定压装置是由补水箱、补水泵及调节器组成,在系统正常运行时,通过压力调节器作用,使补水泵连续补给的水量与系统泄漏量相适应,从而维持系统动水压曲线的位置,但这种定压方式,一般需连续运行,耗电大。
  目前大多利用压力罐结合补水泵的定压补水装置在中央空调中被大量使用,它主要由补水泵、隔膜式气压水罐、安全阀、电接点压力表和电磁阀组成,它的工作原理如下:当系统准备运行时,开启补水泵,水被送至管网的同时也被送至压力罐的水室,水室扩大并将罐内的气体压缩,罐内的压力随之升高,当压力升高至最高工作压力时,水泵停转,系统已充满水,利用压力罐内的压力来维持管网的压力,当系统运行过程中,由于系统漏水或水温改变导致系统水体积减少时,气压罐内的水室缩小,罐内气体膨胀,压力降低,当压力降低至系统最低工作压力时,水泵开启,系统进行补水。装置中的压力表和电磁阀均是安全保护装置,当系统超压时,可通过压力表和电磁阀将多余的水排出系统。

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