描述
IC693CHS391
目前高层建筑在各类城市中比比皆是。为了防止意外火灾，高层建筑一般均设有消防专用泵组。但是许多设备都因无专人管理，不能定期试机运行，天长日久就会导致泵体卡死、锈死，所以经常会出现在发生火灾时设备不能充分发挥作用的情况，造成不应有的损失。通常老设备的启动/运行转换控制用的是皮碗真空式定时继电器，其定时时间误差大，橡胶容易老化破损，维护不便。电子式定时继电器也存在类似问题。我们采用OMRON公司的可编程序控制器（PLC）对消防泵组进行控制，实现泵组在备用时定期试运行，消防用水时自动启动。硬件无调整元件，成本低，可靠性高，维护方便。而且可以很容易地根据不同需要进行扩展。这样能够有效地杜绝泵体锈死或消防用水时不能及时加压的事故。 输入信号分别为水流指示器、水压检测和手动输入。其中水压检测和手动输入各占两点。水流指示器的结构原理为：在水管内安装一个带杠杆的橡皮挡板，杠杆一端连接一个微动开关。如果管道内有水流流动，水流就冲开橡皮挡板，其杠杆推动微动开关，使触点的状态发生变化。水压采用电接点压力表进行检测。一般情况下如前述四台泵循环试机运行。一旦发生火警，打开消防喷淋头或者消防水枪，水流指示器的常开触点闭合，或者按动消防专用启动按钮，水泵即逐台按照水压要求启动运转。实际工作中，若第一台水泵投入后水压达不到所需压力，压力表低压检测触点断开，第二台水泵自动投入运行。若第二台水泵投入后仍达不到所需压力，即压力表低压检测触点仍不闭合，则第三台水泵自动投入运行。依此类推。若水压高于所需压力，压力表高压检测触点闭合，则依次停后启动的水泵，直到水压稳定下来，保持水压恒定在所需的压力范围内。这样可以减小消防人员的操作难度，同时也减小了对管道薄弱环节的威胁。每一台水泵都用两只接触器分别接成星形和三角形结构，用以启动和运行。用水完毕后，水流检测触点断开或者手动按下停水按钮，则重新进入试机循环。
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主营DCS系统配件
机器人系统配件
大型伺服系统配件
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专业销售进口DCS PLC系统备件模块
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