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選擇閥門電動裝置的主要依據

2013-1-15 12:03:10      點擊:
 閥門電動裝置是實現閥門程控、自控和遙控不可缺少的設備,其運動過程可由行程、轉矩或軸向推力的大小來控制。由于閥門電動裝置的工作特性和利用率取決于閥門的種類、裝置工作規范及閥門在管線或設備上的位置,因此,正確選擇閥門電動裝置,對防止出現超負荷現象(工作轉矩高于控制轉矩)至關重要。 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。

 

譯文:
Valve actuators valve is programmed to achieve self-control and remote control essential equipment, the movement by stroke, torque or to control the size of the axial thrust. Because the operating characteristics of electric valve actuators and utilization depends on the type of valves, fittings and valves in the pipeline work norms or the location of the device, so the correct choice of electric valve device to prevent overload of the phenomenon (work transfer moments higher than the control torque) is essential. Torque operation is to select the valve operating torque of the main parameters of electric devices, electric equipment output valve operating torque should be the maximum torque of 1.2 to 1.5 times. Thrust electric valve actuators operating 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 the valve nominal diameter, stem pitch, the first few threads, according to M = H / ZS calculated (M is the total electric device should meet the rotation number, H is the valve opening height, S is the stem transmission thread pitch, Z for the first few stem thread). Stem diameter class for the next shot multi-turn valves, electrical equipment if the maximum allowed by the stem diameter can not pass the valve stem with, it can not be assembled into electric valve. 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 of the valve opening and closing speed if 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.

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