Shkolnikov Viktor, Ramunas John, Santiago Juan G
Department of Mechanical Engineering, Stanford University, Stanford, CA 94305, USA.
Department of Neuroscience, Stanford University, Stanford, CA 94305, USA.
Sens Actuators A Phys. 2010 May;160(1-2):141-146. doi: 10.1016/j.sna.2010.04.018.
We present a design for a miniature self-priming peristaltic pump actuated with a single linear actuator, and which can be manufactured using conventional materials and methods. The pump is tolerant of bubbles and particles and can pump liquids, foams, and gases. We explore designs actuated by a motor (in depth) and a shape memory alloy (briefly); and briefly present a manually actuated version. The pump consists of a Delrin acetal plastic body with two integrated valves, a flexible silicone tube, and an actuator. Pumping is achieved as the forward motion of the actuator first closes the upstream valve, and then compresses a section of the tube. The increased internal pressure opens a downstream burst valve to expel the fluid. Reduced pressure in the pump tube allows the downstream valve to close, and removal of actuator force allows the upstream valve and pump tube to open, refilling the pump. The motor actuated design offers a linear dependence of flow rate on voltage in the range of 1.75-3 V. Flow rate decreases from 780 μl/min with increasing back pressure up to the maximum back pressure of 48 kPa. At 3 V and minimum back pressure, the pump consumes 90 mW. The shape memory alloy actuated design offers a 5-fold size and 4-fold weight reduction over the motor design, higher maximum back pressure, and substantial insensitivity of flow rate to back pressure at the cost of lower power efficiency and flow rate. The manually actuated version is simpler and appropriate for applications unconstrained by actuation distance.
我们展示了一种由单个线性致动器驱动的微型自吸蠕动泵的设计，该泵可以使用传统材料和方法制造。该泵能耐受气泡和颗粒，可泵送液体、泡沫和气体。我们深入探讨了由电机驱动的设计，并简要介绍了由形状记忆合金驱动的设计；还简要介绍了手动驱动版本。该泵由一个带有两个集成阀的聚甲醛塑料主体、一根柔性硅胶管和一个致动器组成。泵送过程如下：致动器向前运动时，首先关闭上游阀，然后压缩一段管子。内部压力升高会打开下游爆破阀以排出流体。泵管内压力降低会使下游阀关闭，去除致动器力会使上游阀和泵管打开，从而重新填充泵。电机驱动的设计在1.75 - 3 V范围内流量与电压呈线性关系。随着背压增加至最大背压48 kPa，流量从780 μl/min降低。在3 V和最小背压下，泵消耗90 mW功率。形状记忆合金驱动的设计在尺寸上比电机驱动的设计小5倍，重量轻4倍，具有更高的最大背压，并且流量对背压基本不敏感，但代价是功率效率和流量较低。手动驱动版本更简单，适用于不受致动距离限制的应用。
