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螺杆压缩机滑阀调节原理与加卸载故障

螺杆压缩机滑阀调节原理与加卸载故障

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一、螺杆制冷压缩机工作原理

螺杆制冷压缩机主要由两个相互咬合的螺杆构成,其中一个称为主动螺杆(阳转子或凸转子),另一个称为从动螺杆(阴转子或凹转子)。这两个螺杆在机体内作回转运动,形成一系列连续的封闭工作室。

吸气过程:当主动螺杆旋转时,它会带动从动螺杆一起旋转。随着螺杆的旋转,齿槽容积逐渐扩大,并与吸入口相连通。此时,由蒸发系统来的气体通过孔口进入齿槽容积,完成气体的吸入过程。

压缩过程:在转子旋转到一定角度后,齿间容积会越过吸入孔口位置,与吸入孔口断开,此时吸入过程结束。随着螺杆的继续旋转,被机体、吸气端座和排气端座所封闭的齿槽内的气体,由于阴阳转子的相互啮合和齿的相互填塞,会被压向排气端。在这个过程中,气体的压力逐渐升高,完成压缩过程。

排气过程:当转子转动到使齿槽空间与排气端座上的排气孔口相通时,气体被压出,并自排气法兰口排出,完成排气过程。此时,螺杆式制冷压缩机的一个完整工作循环结束。

二、螺杆制冷压缩机滑阀调节原理

螺杆制冷压缩机中的滑阀调节是一种用来改变压缩机工作容积,从而实现容量控制的方法。这种调节方式允许压缩机根据系统负载的变化来调整输出冷量,以达到节能和优化运行的效果。

滑阀是用来对容量进行无极控制的,在正常关机以后在开机,该部件不加载,滑阀是由微控制板通过油压来进行控制的,最终改变压缩机制冷能力。滑阀是安装在一个转子轴上的可移动部件。

通过改变滑阀的位置,可以调整转子之间形成的压缩空间的有效长度。调节过程,当滑阀向后移动时,它会减少有效的工作容积,导致部分已吸入但未被完全压缩的气体直接返回到吸气端,这部分气体没有经过完整的压缩循环就被释放掉了,从而减少了实际输出的压缩气体量。

相反地,如果需要增加输出,则将滑阀向前推,使得更多的气体被压缩并通过排气口排出。下面3张图很好的诠释了滑阀从加载到满载的过程,注意看图中的活塞与滑阀的位置变化。

(部分负载)

(满载)

(满载关闭)

通过滑阀的左右移动,增大或减小有效压缩容积,调节输气量大小。当加载时活塞左移带动滑阀左移,输气量增加;减载时:活塞右移带动滑阀右移,输气量减少。

三、压缩机滑阀无法加卸载原因

1、电气控制故障

加载/卸载电磁阀线圈烧毁、阀芯卡滞;控制线路松动断路、PLC无输出信号;滑阀位置传感器失灵,无有效驱动指令,导致电磁阀不动作、油路无法切换。

2、油路故障

油压不足(油位过低、油过滤器堵塞、油泵故障);油路堵塞或泄漏;油活塞密封圈老化窜油;四通阀卡滞、手动控制油路阀未全开,油压无法推动滑阀位移。

3、机械卡滞故障

滑阀本体与机体间隙异物卡阻、拉毛卡死;滑阀导向键损坏;油活塞与油缸拉伤粘连,机械结构直接卡死,即便油压、电气正常也无法移动。

4、机组保护锁定

冷凝压力过高、排气温度超标、油压差不足、吸气压力过低等安全保护触发,控制系统自动锁死滑阀加载功能,禁止负荷调节。

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  1. CONNECT:[ UseTime:0.000933s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001541s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000771s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.001884s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001344s ]
  6. SELECT * FROM `set` [ RunTime:0.000518s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001802s ]
  8. SELECT * FROM `article` WHERE `id` = 480164 LIMIT 1 [ RunTime:0.000899s ]
  9. UPDATE `article` SET `lasttime` = 1774085195 WHERE `id` = 480164 [ RunTime:0.003157s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000600s ]
  11. SELECT * FROM `article` WHERE `id` < 480164 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001109s ]
  12. SELECT * FROM `article` WHERE `id` > 480164 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000928s ]
  13. SELECT * FROM `article` WHERE `id` < 480164 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.004529s ]
  14. SELECT * FROM `article` WHERE `id` < 480164 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001855s ]
  15. SELECT * FROM `article` WHERE `id` < 480164 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.002895s ]
0.189685s