【正文】 業(yè)普及。在大型建筑中即使如此，還常常不能滿足最不利供水點的供水要求，同時由于其存水量較大，在屋頂形成很大的負重，增加了結(jié)構(gòu)的承重和占用 樓層的建筑面積，也妨礙美觀。供水網(wǎng)系出口壓力值是根據(jù)用戶需求確定的。 關(guān)鍵詞：繼電 器， 接觸器 ， 變頻調(diào)速 ， 恒壓供水 共 35 頁 第 2 頁 ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ 裝 ┊ ┊ ┊ ┊ ┊ 訂 ┊ ┊ ┊ ┊ ┊ 線 ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ABSTRACT The water supply project often bees one of most important infrastructures in the highrise construction or the Industrial and mining establishment and the Small businesses. Providing the enough water volume at any time, the steady hydraulic pressure, the qualified water quality is the essential requirements which proposed to the aqueous system. This system has studied the frequency conversion velocity modulation technology in the civil construction water supply system39。任何時候都能提供足夠的水量、平穩(wěn)的水壓、合格的水質(zhì)是對給水系統(tǒng)提出的基本要求。 本系統(tǒng)研究了變頻調(diào)速技術(shù)在民用建筑供水系統(tǒng)中的應用，采用繼電接觸式控制系統(tǒng)和變頻器作為主控單元，配合接觸器， PID 調(diào)節(jié)器，壓力傳感器，干簧管等構(gòu)成了變頻供水的智能控制系統(tǒng)。s application, using relay and contractor control system and the frequency changer, coordinates the contact device, the PID regulator, the pressure transmitter, reed pipes and so on to constitute the frequency conversion water supply intelligent control system. And to save the cost ,It uses relay and contractor to finish the logical control, the frequency changer to finish the pressure control, the pressure transmitter time track water pump outlet pressure and assigns the value of pressure the deviation change, sends in the frequency changer after the PID regulator internal arithmetic, controls 3 electrical machinery by the control circuit to stop as well as the power frequency and the frequency conversion cut, realizes the closed loop automatic control constant pressure frequency conversion water supply, maintains the constant pressure the premise issues the control current capacity the system has fully displayed the advantage of Vaviable frequency Control, has the excellence of energy conservation, automatic control, stable property merit. KEY WORDS: Relay, Contacor, Vaviable frequency Control, Constant pressure water supply 目錄 共 35 頁 第 3 頁 ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ 裝 ┊ ┊ ┊ ┊ ┊ 訂 ┊ ┊ ┊ ┊ ┊ 線 ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ 前言 ..................................................................... 4 供水技術(shù)應用 .............................................................. 4 變頻恒壓供水系統(tǒng)的發(fā)展 .................................................... 6 本課題所需工作 ............................................................ 6 第一章 系統(tǒng)組成及可行性分析 ................................................ 8 變頻調(diào)速的基本原理 ....................................................... 8 變頻恒壓調(diào)速在供水系統(tǒng)中的應用 ............................................ 8 系統(tǒng)工藝流程 .............................................................. 8 控制要求及技術(shù)指標 ........................................................ 9 可行性分析，節(jié)電分析 .................................................... 10 第二章 系統(tǒng)設計 .......................................................... 11 主電路設計 ............................................................... 11 ..................................................... 11 變頻器的發(fā)展 ......................................................... 12 電機運行的控制 ....................................................... 13 工頻變頻切換與變頻器工作的時序的 關(guān)系 ................................. 13 PID 調(diào)節(jié)器的應用和原理 ............................................... 13 確定控制方案 ............................................................. 16 手動運行 ............................................................. 16 自動運行 ............................................................. 16 保護和報警系統(tǒng) ....................................................... 18 儀表 顯示 ............................................................. 18 控制電路圖 ........................................................... 19 第三章 設備選型 .......................................................... 22 變頻器選型 .............................................................. 22 水泵電機的選擇 ........................................................... 22 接觸器 ................................................................... 22 繼電器 ................................................................... 23 ,1 熱繼電器 ............................................................ 23 時間繼電器 ...................................................... 23 中間繼電器 ...................................................... 24 共 35 頁 第 4 頁 ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ 裝 ┊ ┊ ┊ ┊ ┊ 訂 ┊ ┊ ┊ ┊ ┊ 線 ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ 低壓斷路器 .............................................................. 24 壓力變送器 .............................................................. 25 調(diào)節(jié)器 .................................................................. 25 干簧管 .................................................................. 25 頻率顯示儀表 ............................................................ 26 按鈕，萬能開關(guān) ......................................................... 26 指示燈 .................................................................. 26 警鈴 .................................................................... 26 固定線槽的選用 .......................................................... 26 接線端子排的選用 ........................................................ 27 第四章 控制柜設計 ....................................................... 27 相關(guān)布置規(guī)定 .............................................