laboratory stirrer

Abstract

The invention discloses a laboratory stirrer, comprising: a stirring shaft connected with a servo motor for driving the stirring shaft to rotate at a variable speed; a turntable arranged at the end of the stirring shaft; and a floating part slidingly sleeved on the stirring shaft , the floating member is provided with a guide surface, and the guide surface shrinks toward the center of the floating member from top to bottom. This scheme drives the turntable to rotate at a variable speed through a servo motor, and drives the non-Newtonian fluid to move in a circular motion in the direction of rotation. Due to the viscoelasticity of the non-Newtonian fluid, there is a normal stress between the floating part and the turntable, resulting in secondary flow vortices and normal stress. The resultant force formed by the upward thrust of the fluid, the buoyancy of the fluid and the gravity of the floating member itself drives the floating member to move up and down along the stirring shaft, and the secondary flow vortex moves up and down along with it, which works together with the circular motion to improve the mixing effect and improve the stirring efficiency. It involves less accessories, optimizes the structure, and saves costs.

Description

technical field [0001] The invention relates to the technical field of test equipment, in particular to a laboratory stirrer. Background technique [0002] Stirrer is one of the commonly used equipment in the laboratory, which realizes the mixing of materials, and is mainly used for preparing solutions, suspensions and emulsions, preventing material precipitation, etc. At present, the magnetic stirrer and paddle stirrer are most commonly used. The magnetic stirrer has low noise and is flexible and convenient to use. The paddle stirrer has a simple structure and strong stirring power. However, when it is necessary to stir non-Newtonian fluids with high viscoelasticity, As the powder continues to be added, the viscosity of the fluid increases. During the adding process, the air mixed into the fluid will easily form bubbles, which will have a negative impact on the mixing uniformity of the fluid. If a magnetic stirrer is used, the stirring power of the magnetic element is insuf...

AI Technical Summary

Problems solved by technology

At present, magnetic stirrer and paddle stirrer are most commonly used. Magnetic stirrer has low noise and is flexible and convenient to use. Paddle stirrer has simple structure and strong stirring power. However, when it is necessary to stir non-Newtonian fluid with high viscoelasticity, With the continuous addition of powder, the viscosity of the fluid increases, and the entrained air enters the fluid during the addition process, which is easy to form air bubbles and has a negative impact on the uniformity of fluid mixing. If a magnetic stirrer is used, the stirring power of the magnet is insufficient and the stirring efficiency is low. , the material is difficult to mix evenly, and the mixing effect is poor. If a paddle agitator is used, the stirring force can be improved by increasing the diameter of the paddle or increasing the number of paddles, but increasing the diameter of the paddle will increase the body resistance and power The consumption is greatly increased, and the use of multiple blades will complicate the structure of the device and increase the cost of use

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