Precision plunger metering pump

Abstract

The invention relates to a precision plunger metering pump, comprising three parts, including a driving mechanism, a sealing mechanism and a pump head, wherein by utilizing a photoelectric encoder, the driving mechanism accurately controls the movement of a stepper motor, thereby effectively preventing the error of pump output caused by the falling out of step or the idling of the motor from being generated; a sealing ring in the sealing mechanism is matched with a plunger piston to realize precision fit, and the sealing ring based on a stainless steel spring enclasping mechanism solves the problems of low enclasping force and easy aging of a traditional rubber ring and prolongs the service life; the pump head has the design of water washable airtight cabin, realizes the washing and sealing functions of the plunger piston and the sealing ring and prolongs the sealing life; the technic level of processing the plunger piston and slab rubber achieves the purpose that a miniature precision plunger metering pump can provide 20MPa pressure intensity; and the slab rubber has good polishing performance, extremely high transparency, compact structure, small volume and delicate appearance. The precision plunger metering pump can be applied to the precise metering of fluid in the fields of medication, sanitation, biology and chemistry.

Description

technical field [0001] The invention relates to a fluid precision metering and output device, which is applied in the fields of medical treatment, sanitation, biology and chemistry, and is a fluid perfusion device with a precision level of 0.1uL, a tolerance of less than 20 MPa, and the need to observe the window of the pump cabin. Background technique [0002] Precision plunger metering pumps have been widely used in high-precision perfusion equipment in the fields of pharmaceuticals, biological reagents and petrochemical industries for their high-precision control of fluid metering and strong corrosion resistance. As an ideal equipment for fluid precision metering, after more than half a century of practical application and technical improvement, metering pumps have now entered their high-speed growth period, forming a current product status that uses two mainstream technologies of plunger and diaphragm. Now, the mature power drive method and the material technology of the...

AI Technical Summary

Problems solved by technology

However, the indicators of metering pumps used in industries such as medical treatment, sanitation, and chemical preparations, such as accuracy requirements, are more stringent than those in other industrial fields. The types of precision metering pumps that can meet such applications are relatively limited, and the scale and speed of development are not as good as industrial metering pumps.

At present, the pump head is developed with strong corrosion resistance and transparent materials, and the water-washed sealed compartment mechanism is used to improve the sealing performance. The compact precision plunger metering pump with a distribution accuracy of 0.1uL has no precedent in China.

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