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主汽轮机培训课件(EH油系统).ppt

  • 2026-06-02 20:23:38
主汽轮机培训课件(EH油系统).ppt

本篇讲述主汽轮机高压抗燃油系统

EH油泵工作原理

由交流马达驱动高压变量柱塞泵,通过油泵吸入滤网将油箱中的抗燃油吸入,EH油泵出口的抗燃油经过压力滤油器通过单向阀流入高压蓄能器和与该蓄能器联接的高压油母管,将高压抗燃油送到各执行机构和危急遮断系统。 

溢流阀

作用:在定量泵节流调速系统中,用来保持液压泵出口压力恒定, 并将液压泵多余的油液溢回油箱,这时溢流阀起定压和溢流作用。在系统中起安全阀的作用。

先导式溢流阀工作原理

先导溢流阀的主阀上腔压力,是由先导阀加于控制的。如果先导阀正常工作,即主阀上腔有先导阀规定的压力,则整个溢流阀就会在系统压力到达调定压力时其主阀口打开一定的开度,一方面能将系统多余流量流回油箱,另一方面又能维持系统的压力为先导阀的调定值。可见,先导阀主要管压力,主阀服从先导阀的领导,在先导阀动作时将主阀口开到合适大小,正好将多余流量流出去,又不影响系统压力。

冷却系统部件

作用:保持油箱的油温在正常的工作范围之内。

当油温超过55℃时,温度开关动作使电磁水阀带电打开,向冷油器通冷却水;

当油温低于35℃时,温度开关动作使电磁水阀失电关闭。

为了保证油系统的清洁度,设有独立的自循环滤油系统。滤油泵从油箱内吸油,经两个并列运行的滤网回油箱。滤油泵由就地端子箱上的控制按钮控制启、停。

滤油器做成筒式,内装有3个相串联的精密滤芯,当滤油器进出口间压差大于0.3MPa时,接在滤油器进出口间的过载单向阀动作,将滤油器短路以避免损坏,同时差压开关发出报警信号,提醒运行人员更换滤芯。

再生装置作用:在油箱旁安装有一套EH油再生装置,用来储存吸附剂和使抗燃油得到再生,它由硅藻土滤器(使油保持中性、去除水份等)和纤维滤器(去除杂质)串联组成。

操作步骤:在投入再生装置时,应先开启硅藻土滤器的旁路门对硅藻土滤器注油,然后开启硅藻土滤器入口门,关闭旁路门。

当油温在43~54℃之间,而任何一个滤器压力高达0.21Mpa时,就需更换滤芯。

注意:遵守操作顺序否则可能造成硅藻土滤器滤芯损坏。

执行机构分类:

开关型

阀门在全开全关位置工作

组成:油缸、液压块、二位二通电磁阀、快速卸荷阀、逆止阀

例如:再热主汽门

调节型

可将汽阀控制在任意中间位置上,成比例调节进汽量适应需要。

组成:比开关型多电液伺服阀

例如:主汽门、调节汽门、再热调节汽门

截止阀:用来切断油动机的供油。这样就可以对油动机进行不停机检修,如调换滤油器,电液转换器或卸载阀。

单向阀:用在回油管路上,以防止在油动机检修期间由压力回油管来的油流回到油动机中。单向阀(另一个)安装在危急跳闸油路中,它可使油动机关闭时(无论是试验或是维修)不影响其它油动机活塞所处的位置,即不影响危急遮断母管油压。

快速卸载阀

位置:安装在油动机液压块上。

作用:当机组发生故障必须紧急停机或在危急脱扣装置动作或机组转速超过103%额定转速OPC电磁阀动作时,使危急遮断油或OPC油泄油失压后,可使油动机活塞下去腔的压力油经快速卸载阀快速释放,这时不论伺服阀放大器输出的信号大小,在阀门弹簧力作用下,均使阀门关闭。

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  1. CONNECT:[ UseTime:0.000700s ] mysql:host=127.0.0.1;port=3306;dbname=h_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000857s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000311s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000285s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000506s ]
  6. SELECT * FROM `set` [ RunTime:0.000211s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000556s ]
  8. SELECT * FROM `article` WHERE `id` = 515822 LIMIT 1 [ RunTime:0.000810s ]
  9. UPDATE `article` SET `lasttime` = 1781008681 WHERE `id` = 515822 [ RunTime:0.009667s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000302s ]
  11. SELECT * FROM `article` WHERE `id` < 515822 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.008854s ]
  12. SELECT * FROM `article` WHERE `id` > 515822 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.004455s ]
  13. SELECT * FROM `article` WHERE `id` < 515822 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.019020s ]
  14. SELECT * FROM `article` WHERE `id` < 515822 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.006154s ]
  15. SELECT * FROM `article` WHERE `id` < 515822 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.003279s ]
0.127962s