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電動閥門裝置應注意的問題

2013-1-15 12:03:53      點擊:
操作力矩:操作力矩是選擇閥門電動裝置的最主要參數,電動裝置輸出力矩應為閥門操作最大力矩的1.2~1.5倍。操作推力:閥門電動裝置的主機結構有兩種:一種是不配置推力盤,直接輸出力矩;另一種是配置推力盤,輸出力矩通過推力盤中的閥桿螺母轉換為輸出推力。輸出軸轉動圈數:閥門電動裝置輸出軸轉動圈數的多少與閥門的公稱通徑、閥桿螺距、螺紋頭數有關,要按M=H/ZS計算(M為電動裝置應滿足的總轉動圈數,H為閥門開啟高度,S為閥桿傳動螺紋螺距,Z為閥桿螺紋頭數)。 閥桿直徑:對多回轉類明桿閥門,如果電動裝置允許通過的最大閥桿直徑不能通過所配閥門的閥桿,便不能組裝成電動閥門。因此,電動裝置空心輸出軸的內徑必須大于明桿閥門的閥桿外徑。對部分回轉閥門以及多回轉閥門中的暗桿閥門,雖不用考慮閥桿直徑的通過問題,但在選配時亦應充分考慮閥桿直徑與鍵槽的尺寸,使組裝后能正常工作。輸出轉速:閥門的啟閉速度若過快,易產生水擊現象。因此,應根據不同使用條件,選擇恰當的啟閉速度。閥門電動裝置有其特殊要求,即必須能夠限定轉矩或軸向力。通常閥門電動裝置采用限制轉矩的連軸器。當電動裝置規格確定之后,其控制轉矩也就確定了。一般在預先確定的時間內運行,電機不會超負荷。但如出現下列情況便可能導致超負荷:一是電源電壓低,得不到所需的轉矩,使電機停止轉動;二是錯誤地調定轉矩限制機構,使其大于停止的轉矩,造成連續產生過大轉矩,使電機停止轉動;三是斷續使用,產生的熱量積蓄,超過了電機的允許溫升值;四是因某種原因轉矩限制機構電路發生故障,使轉矩過大;五是使用環境溫度過高,相對使電機熱容量下降。過去對電機進行保護的辦法是使用熔斷器、過流繼電器、熱繼電器、恒溫器等,但這些辦法各有利弊。對電動裝置這種變負荷設備,絕對可靠的保護辦法是沒有的。因此,必須采取各種組合方式,歸納起來有兩種:一是對電機輸入電流的增減進行判斷;二是對電機本身發熱情況進行判斷。這兩種方式,無論那種都要考慮電機熱容量給定的時間余量通常,過負荷的基本保護方法是:對電機連續運轉或點動操作的過負荷保護,采用恒溫器;對電機堵轉的保護,采用熱繼電器;對短路事故,采用熔斷器或過流繼電器。

 

 

譯文:
Operating torque: torque operation is to select the most important parameters of valve actuators, electric actuator output torque maximum torque valve operation should be 1.2 ~ 1.5 times. Operating Thrust: electric valve actuators of the host structure, there are two: one is not configured thrust plate, the direct output torque; the other is the thrust plate configuration, the output torque of the valve stem nut through the thrust plate is converted to output thrust. Output shaft revolutions: electric valve actuators output shaft revolutions and the number of nominal diameter valve stem pitch, the first few threads, according to M = H / ZS calculated (M is the electric equipment should meet The total number of revolutions, H is the valve opening height, S is the stem transmission thread pitch, Z is the number of stem thread first). Stem diameter: the next shot on the multi-turn type valves, electrical equipment if the maximum allowed by the stem diameter can not be dispensed through the valve stem, the valve can not be assembled into electric. Therefore, the electric device inside diameter of the hollow output shaft must be greater than the next shot of the valve stem diameter. On the part of the rotary valve and rotary valve valve rod in the dark, although not considered by the stem diameter, but should also take full account of the matching stem diameter and keyway sizes, so that after assembly to work . Output speed: If the valve opening and closing speed too fast, easy to produce water hammer phenomenon. Therefore, according to the different conditions of use, choose the appropriate opening and closing speed. Electric valve actuators have special requirements that must be able to limit the torque or axial force. Usually limit the use of electric valve actuators torque coupling. When the electric device specifications determined, the control torque is also determined. Generally operate within a predetermined time, the motor will not overload. However, if the following conditions may lead to overload: First, the supply voltage is low, not the required torque, the motor stops rotating; the second is wrong it is set torque limit institutions to stop the torque is greater than , resulting in continuous excessive torque, the motor stops rotating; Third, intermittent use, savings generated by the heat, more than the allowable temperature rise of the motor; Fourth, institutions for some reason the torque limit circuit fault, the torque is too large; Fifth, the ambient temperature is too high, the relative decline in the motor thermal capacity. Past the motor protection is to use fuse, overcurrent relays, thermal relays, thermostats, etc., but these approaches have advantages and disadvantages. This variable load on the electric equipment installation, absolutely reliable protection method is not. Therefore, we must take a variety of combinations, summed up in two ways: First, changes in the motor input current to judge; second heat of the motor itself to judge. These two methods, regardless of the kind must take into account the motor thermal capacity margin is usually given time, the basic overload protection methods are: continuous operation of the motor jog operation or overload protection, the use of a thermostat; of Stall protection, thermal relay; of a short circuit, the use of fuses or overcurrent relays.

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