| 振動(dòng)開(kāi)關(guān)及振動(dòng)變送器、傳感器
Vibration Transmitter / Sensors Vibration Monitoring Solutions
Cooling tower vibration switches
卻塔振動(dòng)開(kāi)關(guān) 當(dāng)發(fā)生過(guò)度振動(dòng)時(shí)，冷卻塔振動(dòng)開(kāi)關(guān)觸發(fā)警報(bào)和/或關(guān)閉設(shè)備有多種選擇，從簡(jiǎn)單的機(jī)械開(kāi)關(guān)到“智能”開(kāi)關(guān)。SPX冷卻技術(shù)提供以下開(kāi)關(guān)類(lèi)型，每種類(lèi)型都具有不同的復(fù)雜程度，可幫助監(jiān)測(cè)和保護(hù)冷卻塔部件免受振動(dòng)的潛在破壞性影響。Cooling tower vibration switches trigger an alarm and/or shut down equipment when excessive vibration occurs. A variety of options are available, from simple mechanical switches to “smart” switches. SPX Cooling Technologies provides the following switch types, each with varying levels of sophistication, which can help monitor and protect cooling tower components from potentially destructive effects of vibration.
Mechanical Vibration Switch
機(jī)械振動(dòng)開(kāi)關(guān)
機(jī)械振動(dòng)開(kāi)關(guān)是冷卻塔振動(dòng)管理有效的選擇。然而，它往往是最不準(zhǔn)確和最不可靠的選擇。機(jī)械開(kāi)關(guān)包括一個(gè)慣性敏感機(jī)構(gòu)，當(dāng)振動(dòng)超過(guò)規(guī)定的設(shè)定值時(shí)，該機(jī)構(gòu)激活一個(gè)速動(dòng)開(kāi)關(guān)。當(dāng)開(kāi)關(guān)“跳閘”時(shí)，可以同時(shí)觸發(fā)警報(bào)并關(guān)閉設(shè)備。因?yàn)檫@些開(kāi)關(guān)不收集數(shù)據(jù)，所以它們只能在振動(dòng)事件發(fā)生時(shí)作出反應(yīng)。在許多情況下，這對(duì)于防止故障已經(jīng)太遲了；機(jī)械開(kāi)關(guān)能防止的是對(duì)風(fēng)塔的進(jìn)一步損壞。The mechanical vibration switch is the most cost-effective option for cooling tower vibration management. However, it is often the least accurate and least reliable option. The mechanical switch comprises an inertia-sensitive mechanism that activates a snap-action switch if vibration exceeds a specified set point. The switch, when “tripped,” can simultaneously trigger an alert and shut down the equipment. Because these switches do not collect data, they are able only to react to a vibration event as it is occurring. In many cases this is too late to prevent a failure; the only thing the mechanical switch prevents is further damage to the tower. Electronic Vibration Switch
電子振動(dòng)開(kāi)關(guān)
電子振動(dòng)開(kāi)關(guān) 用于冷卻塔振動(dòng)管理的電子振動(dòng)開(kāi)關(guān)比機(jī)械開(kāi)關(guān)有幾個(gè)優(yōu)點(diǎn)。電子開(kāi)關(guān)利用固態(tài)壓電晶體在振動(dòng)力變形時(shí)提供4-20毫安的電輸出。超過(guò)預(yù)設(shè)極限的振動(dòng)會(huì)觸發(fā)警報(bào)，提醒操作人員檢查冷卻塔，并在故障發(fā)生前將其關(guān)閉。如果在操作員手動(dòng)關(guān)閉風(fēng)塔之前，振動(dòng)超過(guò)第二個(gè)預(yù)設(shè)限值，則開(kāi)關(guān)觸發(fā)固態(tài)繼電器自動(dòng)關(guān)閉。機(jī)械和電子開(kāi)關(guān)通常安裝在結(jié)構(gòu)支撐梁上。另外，電子開(kāi)關(guān)還提供了一個(gè)外部加速計(jì)選項(xiàng)，當(dāng)安裝在變速箱外殼上時(shí)，可以提供更高的振動(dòng)測(cè)量精度。The electronic vibration switch for cooling tower vibration management has several advantages over a mechanical switch. The electronic switch utilizes a solid-state piezoelectric crystal to provide a 4-20mA electrical output when deformed by vibration forces. Vibration that exceeds a preset limit triggers an alarm, alerting operators to inspect the cooling tower and shut it down before failure occurs. If vibration exceeds a second preset limit before operators manually shut down the tower, the switch triggers a solid-state relay for automatic shutdown. Both the mechanical and electronic switches typically are mounted on structural support beams. Alternately, the electronic switch offers an external accelerometer option which provides superior vibration measurement accuracy when mounted on the casing of the gearbox. “Smart” Vibration Switch
“智能”振動(dòng)開(kāi)關(guān)
“智能”振動(dòng)開(kāi)關(guān)用于冷卻塔振動(dòng)管理的“智能”振動(dòng)開(kāi)關(guān)提供了電子振動(dòng)開(kāi)關(guān)的許多優(yōu)點(diǎn)。智能開(kāi)關(guān)使用內(nèi)置壓電加速度計(jì)測(cè)量振動(dòng)。它占地面積小，外殼密封，可直接安裝在齒輪箱或軸承箱上，不需要額外的外部加速計(jì)。SPX提供的智能開(kāi)關(guān)具有工廠編程設(shè)定值、啟動(dòng)延遲和警報(bào)延遲計(jì)時(shí)器，特別針對(duì)冷卻塔振動(dòng)保護(hù)進(jìn)行了優(yōu)化。The “smart” vibration switch for cooling tower vibration management offers many of the advantages of an electronic vibration switch. The smart switch measures vibration with an imbedded piezoelectric accelerometer. Its small footprint and hermetically sealed casing allow installation directly onto the gearbox or bearing housing and does not require an additional external accelerometer. Smart switches offered by SPX feature factory-programmed set points, start-up delays, and alarm delay timers specifically optimized for cooling tower vibration protection. | 
