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Hose pumps use a sequential constriction of a length of hose to move fluids through positive displacement. There are two types: rotary and linear. Tube pumps are effective for pumping sterile or hazardous fluids and are commonly used in the chemical, medical, and cleaning industries. They are ideal for pumping fluids with varying viscosities and highly predictable discharge rates. The closed loop design makes them suitable for moving sterile or hazardous fluids.
A hose pump is a simple but efficient design pump that relies on a sequential constriction of a length of hose to move fluids through a positive displacement process. There are two basic forms of these devices, namely rotary and linear, both of which achieve the same result by restricting the pipe in different ways. Tube pumps are particularly effective in pumping sterile or hazardous fluids where the liquid must be completely isolated from its surroundings and vice versa. The tubular pump, or peristaltic pump as it is also known, is suitable for pumping low or high viscosity fluids, and is commonly used in the chemical, medical and cleaning industries where high flow rates are not required.
A rotary tube pump consists of a length of hose with one end connected to a fluid reservoir and the other forming the pump’s discharge point. The pump mechanism consists of a circular casing with a lobed rotor in the center equipped with round wheels or skids at the end of each lobe. The tubing is arranged around one half of the casing such that the star wheels press and constrict it as they pass that half of the casing. When this happens, the positive displacement forces the fluid in the tube in front of the restricted point to flow down the tube in the direction the rotor is turning. At the same time, the tube returning to its open state as the rotor shoe passes draws more fluid into the tube to be moved forward in turn by the next passing shoe.
The less common linear type of tube pump has a tube reservoir and discharge arrangement similar to that of the rotary pump with the tube laid flat in a straight line. A number of flat plates stacked against each other are placed just above the pipe. Each plate has an identical profiled hole in its top half with all holes aligned with each other. Through these holes a sequential cam is passed which, when rotated, moves the plates up and down, sequentially compressing the pipe. This pulsating constriction of the tube moves fluid through the system via the same principle of positive displacement seen in the rotary tube pump.
The tube pump is an ideal system for pumping fluids with varying viscosities at moderate speeds and highly predictable discharge rates. The closed loop design of the pump makes it ideal for moving sterile or hazardous fluids where any cross-contamination between the fluid and the environment is unacceptable. These features make this pump system a good choice for certain chemical processes and for pumping intravenous fluids or drugs into infusion systems. Tube pumps are also often used in cleaning systems where they are used as dosing mechanisms for detergents and water softeners.
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