Peristaltic pump is a commonly used liquid conveying device, which can transport a variety of materials with strong corrosive, abrasive and oxygen sensitive properties. Liquid only contact the pump pipe, do not contact the pump body, there is no valve, mechanical seal and other structures, can be idle in the case of no liquid filling, can also be in the case of no liquid filling self-priming. The advantage of peristaltic pump is very prominent, but the disadvantage is that the accuracy is not high, generally in about 5%, if you want to achieve the accuracy of conventional laboratory measuring tools, it needs to reach 1%, 0.5%.
A peristaltic pump is a motor that drives the roller to rotate, and the roller and the pump casing squeeze the pump tube, alternately squeezing and releasing the fluid. The peristaltic pump forms a "pillow" fluid in a section of the pump tube between two rollers. The volume of the pillow depends on the inner diameter of the pump pipe and the geometry of the rotor. The flow rate depends on the product of three parameters: the speed of the pump head, the size of the pillow and the number of pillows produced per turn of the rotor.
It can be seen that the improvement of accuracy mainly depends on two aspects, one is the shape of the pillow to be stable, the other is the speed control to be accurate. The shape of the pillow to be stable, mainly depends on the pump head and the pump pipe two aspects, the pump head involves the structure, material and processing accuracy, the pump pipe involves the material and are once. Speed control to be accurate, mainly depends on the host motor and control system.
Pump pipe not only shape, wall thickness uniform, the same type of material, through the improvement of materials and processing, to provide better elasticity and durability, so that the pillow shape more full, consistent. The pump head has metal, plastic and other different materials, the roller has a conventional cylindrical shape also has a special prism, the number of rollers is also a variety of options.
By improving the material hardness, processing accuracy and parts fit, the deformation space of the pump pipe is uniform, so that the size and shape of each pillow is consistent, but also let each pillow in the operation process to maintain volume stability. The main machine selects the high-precision motor, the main machine can be controlled by the feedback of the motor and the photoelectric coupling element, to ensure that the motor can accurately rotate and control the positioning in every Angle, even after thousands of rotations, the rotor still returns to the origin, to ensure the accuracy and stability of the control.
The peristaltic pump controls the shape of the pillow easily, so in calibration mode, can be set to four decimal places, in practical applications and customer feedback, also common pipetting accuracy of 0.5% or higher. In addition, RFID technology can also monitor the life of the pump pipe, plugging and rupture in real time, to ensure the stability and safety of pipette.
Not only can do liquid conveying, higher accuracy, so that it can deal with the vast majority of liquid volume problems, such as dilution, constant volume, filling, rapid packaging, liquid volume, multi-channel pipetting, etc., in chemical industry, mining, metallurgy, petroleum, ceramics, paper, paint coatings, water treatment, food, pharmaceutical, medical equipment and other industries have a more extensive application, Can be in sampling, testing, testing, production and other links.
