Adjustable pipettor and adjusting device thereof

Abstract

The invention provides an adjustable pipettor and an adjusting device thereof. The adjusting device is arranged in the shell (5) of the pipettor with an axis (x-x), and comprises a screw (2), a nut (1), an elastic component (8) and an internal sleeve (7). The screw (2) comprises an operation end and a piston end, and is capable of rotating and moving along the axis, at least one part of the screwextends in the outer shell (5); the nut (1) cannot rotate, but can move close to the piston end along the axis (x-x) to be arranged in the outer shell (5) and matched with the screw threads of the screw (2); one end of the elastic component (8) is connected with the shell, the other end is connected with the nut, the pull force applied to the nut by the elastic component prevents the nut (11) frommoving to the piston end and pulls the nut back to the operation end; the internal sleeve (7) is arranged in the shell (5) by the way of moving along the axis (x-x) and limits the movement distance of the screw relative to the internal sleeve along the axis.

Description

technical field [0001] The invention relates to a liquid pipetting tool used in the fields of chemistry, medicine and health, biology, etc., especially an adjustment device for an adjustable pipette with accurate positioning and clear action. Background technique [0002] The working principle of the pipette is mainly to use the linear movement of the special piston inside the pipette inside the piston cylinder to change the internal volume of the piston cylinder, so as to realize the suction or discharge of liquid and achieve the purpose of quantitative transfer of liquid. The amount of liquid absorbed and discharged by the pipette is determined by the change in the internal volume of the piston cylinder. The existing adjustable pipette adopts the method of changing the position of the stop point of the piston by adjusting the device to realize the change of the volume of the piston cylinder. The action of the spring force returns the piston to its original position. In ma...

AI Technical Summary

Problems solved by technology

An adjustment device is disclosed in the U.S. Patent Application Publication No. US2002 / 0041833A1 named "Adjustable Pipette". The corresponding stress changes, so that the operation feels different at different capacities, and the position of the spring is lower, which is easy to be polluted

An adjustment device is also disclosed in the European Invention Patent Application Publication No. EP1230979A2 named "Volume Adjustable Pipette". Here, although the length of the spring does not change during adjustment, because the position of the secondary spring is lower , close to the piston, more susceptible to contamination

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