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The main reason for grinding the shaft: BIA type double end mechanical seal, the back pressure state is bad working state, the particles in the medium, impurities are easy to enter the sealing surface, make the seal failure. The main part of the grinding shaft is the rubber bellows, and because the sealing surface of the upper end is in poor lubrication state, the friction torque between the rotor and rotor rings is greater than the transfer torque between the rubber bellows and the shaft, which causes relative rotation. (3) moving, static ring auxiliary seal due to the weak acid in the sewage, weak alkali corrosion, rubber has no elasticity. Some have rotted and lost their proper functions, resulting in the phenomenon of grinding the shaft.
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原纱央莉拍过的电影,亚洲丰满美女大白兔,梦幻之旅网页游戏
日期:2021-08-02

1、第壹種冷卻形式由水泵的出口或高壓端,將輸送的幹凈介質,直接沖洗密封端面,然後進入泵腔內,通過介質的不斷循環,將磨擦端面的的磨擦熱帶走達到冷卻的效果。

2、第二種冷卻方式在第壹種冷卻形式的基礎上在靜環的背部增加壹冷卻水套,原纱央莉拍过的电影,亚洲丰满美女大白兔,梦幻之旅网页游戏 效果有所改善,並可以沖洗,收集泄露出來的液體。當密封介質溫度> 150℃ 時除了在冷卻水套中通過冷卻水及靜環背部冷卻外,應采取強制冷卻措施。即從泵出口的幹凈介質應預先經熱交換器冷卻至 50℃ 時。再進入密封腔冷卻沖洗,該形式是冷卻效果最良好的壹種。

  • 原纱央莉拍过的电影(38)
  • .周期性滲漏 (1)泵轉子軸向竄動量大,輔助密封與軸的過盈量大,動環不能在軸上靈活移動。在泵翻轉,動、靜環磨損後,得不到補償位移。 對策:在裝配機械密封時,軸的軸向竄動量應小於0.1mm ,輔助密封與軸的過盈量應適中,在保證徑向密封的同時,動環裝配後保證能在軸上靈活移動(把動環壓向彈簧能自由地彈回來)。 (2)密封面潤滑油量不足引起幹摩擦或拉毛密封端面。

    對策:油室腔內潤滑油面高度應加到高於動、靜環密封面。 (3)轉子周期性振動。原因是定子與上、下端蓋未對中或葉輪和主軸不平衡,汽蝕或軸承損壞(磨損) ,這種情況會縮短密封壽命和產生滲漏。 對策:可根據維修標準來糾正上述問題。(1) small submersible sewage pump seal leakage caused by the phenomenon of grinding shaft (1) small pump seal failure below 715kW often produce grinding shaft, the main grinding shaft position has the following several: moving ring auxiliary seal ring position, static ring position, a few springs have grinding shaft phenomenon. (2) the main reason for grinding the shaft: BIA type double end mechanical seal, the back pressure state is bad working state, the particles in the medium, impurities are easy to enter the sealing surface, make the seal failure.

  • 原纱央莉拍过的电影(35)
  • ②原纱央莉拍过的电影,亚洲丰满美女大白兔,梦幻之旅网页游戏的主要件為橡膠波紋管,且是由於上端密封面處於不良潤滑狀態,動靜環之間的摩擦力矩大於橡膠波紋管與軸之間的傳遞轉矩,發生相對轉動。③動、靜環輔助密封由於受到汙水中的弱酸、弱堿的腐蝕,橡膠件已無彈性。有的已腐爛,失去了應有的功能,產生了磨軸的現象。

    (3)為解決以上問題,現采取如下措施:①保證下端蓋、油室的清潔度,對不清潔的潤滑油禁止裝配。②機封油室腔內油面線應高於動靜環密封面。③根據不同的使用介質選用不同結構的機封。對高揚程泵應重新設計機封結構,對腐蝕性介質橡膠應選用耐弱酸、弱堿的氟橡膠。機封靜環應加防轉銷。 二、由於壓力產生的滲漏 (1) leakage of mechanical seal caused by high pressure and pressure wave. When the specific spring pressure and total specific pressure are too large and the pressure in the sealing chamber exceeds 3MPa, the specific pressure of the sealing end face will be too large, and the liquid film will be difficult to form. Countermeasures: in the assembly of machine seal, spring compression must be carried out according to the provisions, do not allow the phenomenon of too large or too small, high pressure mechanical seal should take measures.

  • 原纱央莉拍过的电影(33)
  • 為使端面受力合理,盡量減小變形,可采用硬質合金、陶瓷等耐壓強度高的材料,並加強冷卻的潤滑措施,選用可*的傳動方式,如鍵、銷等。 (2)真空狀態運行造成的機械密封滲漏泵在起動、停機過程中,由於泵進口堵塞,抽送介質中含有氣體等原因,有可能使密封腔出現負壓,密封腔內若是負壓,會引起密封端面幹摩擦,內裝式機械密封會產生漏氣(水)現象,原纱央莉拍过的电影,亚洲丰满美女大白兔,梦幻之旅网页游戏與正壓密封的不同點在於密封對象的方向性差異,而且機械密封也有其某壹方向的適應性。 對策:采用雙端面機械密封,這樣有助於改善潤滑條件,提高密封性能。

    四、因其他問題引起的機械密封滲漏 自貢機械密封中還存在設計、選擇、安裝等不夠合理的地方。 (1)彈簧壓縮量壹定要按規定進行,不允許有過大或過小的現象,誤差±2mm ,壓縮量過大增加端面比壓,摩擦熱量過多,造成密封面熱變形和加速端面磨損,壓縮量過小動靜環端面比壓不足,則不能密封。    (2)安裝動環密封圈的軸(或軸套)端面及安裝靜環密封圈的密封壓蓋(或殼體)的端面應倒角並修光,以免裝配時碰傷動靜環密封圈。

     

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