大小单双倍投顺口溜

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计量泵流量调节的方式

来源: 时间:2019-10-02 21:24:25 次数:

此类调节形式是对冲程的峰值流量进行调节,随着计量泵输出流量的改变,流量脉动对管路系统的冲击和影响也会随之改变。可变偏心调节机构是计量泵中被普遍采用的机构形式,尤其是高负荷,苛刻环境的计量泵绝大部分采用此调节形式,只有极少品牌采用曲柄连杆调节机构。

   一、手动调节方式

    手动调节方式是采用计量泵驱动机构中的机械子系统使泵的冲程长度或有效冲程长度在0~100%范围内变化,从而达到调节流量的目的。手动调节的方式包括:

    1. 可调偏心机构调节

    可调偏心机构是通过调节计量泵的调节螺杆,从而改变计量泵偏心机构的偏心距,达到改变计量泵柱塞行程的目的。柱塞行程的改变直接改变了计量泵每个冲程的排量,所以计量泵的输出流量随之改变。

    此类调节形式是对冲程的峰值流量进行调节,随着计量泵输出流量的改变,流量脉动对管路系统的冲击和影响也会随之改变。可变偏心调节机构是计量泵中被普遍采用的机构形式,尤其是高负荷,苛刻环境的计量泵绝大部分采用此调节形式,只有极少品牌采用曲柄连杆调节机构。


计量泵




    2. 有效冲程长度调节

    有效冲程调节又被称为液压旁路调节。有效冲程长度调节与可调偏心结构调节有所不同。有效冲程调节结构不是直接改变计量泵的冲程长度,在整个调节过程中,计量泵柱塞运动的冲程长度没有直接变化。有效冲程长度调节是利用液压旁路的开与关,改变柱塞实际驱动隔膜的冲程长度,也就是改变了柱塞驱动做功的有效长度。通过改变柱塞的有效冲程,从而改变每个冲程的排量,最终改变计量泵的输出流量。

    由于有效冲程调节不是直接改变柱塞的冲程长度,所以流量曲线的峰值不会随有效冲程改变而改变。有效冲程调节只用于液压隔膜计量泵,是一种机构简单,调节有效稳定的机构,基本用于中低负荷计量泵的调节机构。有效冲程调节方式已经在API675第三版中被列为计量泵冲程调节方式之一。

    3. 机械“放过”式调节

    机械放过式调节的英文名称是LOST MOTION。它采用机械限位的方式,人为地使机械驱动机构与液力端柱塞脱离,从而改变柱塞的运动冲程长度,达到改变计量泵输出流量的目的。

机械放过式调节不适合应用于高负荷的应用工况,普遍应用于低负荷的机械隔膜计量泵。此类调节机构的工作噪音很响,且稳定性精度较低,长期工作的稳定性也较差。

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