Last month we discussed the internal operation of reciprocating pumps, one of two types of positive displacement pumps. This month we will analyze how the other type of PD pump – rotary pumps.
旋转泵具有旋转齿轮，而不是向后和向前的圆柱体运动，例如往复泵。在某些情况下，它们可以通过旋转组件的速度无密封操作，从而产生液态环。该液体环将气体捕获在液态环和泵室之间，以在运行时形成浅表密封。这项运动还会在入口处产生吸力。
There are multiple variations of rotary pumps. Here are the types of rotary pumps and how they operate:
齿轮泵是一种常见的旋转泵，由两个互锁齿轮组成。根据齿轮的尺寸和旋转运动，它们可以是内部或外部的。
一个外齿轮泵有相同大小的齿轮旋转相反的吗directions. Sometimes motion is driven by the other. These pumps create suction by trapping fluid between the gear teeth and outside casing by both gears. Fluid pressure and flow are ensured by tight tolerances between these components preventing fluid from leaking towards the discharge side and interlocking gears that keep liquid from flowing in the center.
Tight tolerances between these components ensure the fluid does not leak towards the discharge side and as the gears interlock as they rotate together to prevent fluid flowing through the center, which would disrupt the pressure. There are three types of external gear pumps: spur, helical, and herringbone.
一个内齿轮泵通过使用不同尺寸的齿轮进行操作，较小的齿轮在较大的固定齿轮上旋转。该功能与外部齿轮泵类似，通过在两个齿轮的腔之间捕获流体来产生流动。内部和外部泵都需要通过它们泵送的流体来很好地润滑，并且由于内部的摩擦力学，不应干燥。它们是高粘度流体（例如油和油漆）的理想选择。
另外两种常见的旋转类型是lobe pumpsand叶片泵. Lobe pumps operate almost identically to external gear pumps except the lobe shape means there is no direct contact. This reduces the certainty of wear that comes with gear pumps. Vane pumps mount aspherical components on a shaft that is off-center from the inner chamber. The spherical component contains moveable vanes within that extend when the space increases. These vanes, when extended, trap fluid between them as they rotate toward the discharge port. This flexibility of the vanes comes from spring-loaded designs, or they are put under hydraulic pressure.
叶泵通常在化学和食品工业中发现。它们提供了低剪切型，易于清洁和消毒，使其非常适合卫生，药物和生物技术应用。叶片泵具有耐用的设计，因为叶片对流动固体具有抗性。它们主要用于使用传输系统，燃料加载和传输油在汽车行业中常见的低粘度流体的应用中。
有更多问题或想了解有关旋转泵或其他正排量泵的更多信息？您需要改进特定的泵问题或流体过程吗？是否想与我们的一位流体专家交谈，讨论您想解决或改进的流动过程？单击下面的链接或立即致电我们。