Pasteurizing Machine With Direct Brushless-Motor Stirrer Drive
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Solution Overview
Problem
Existing pasteurizing machines are inefficient in increasing the overrun percentage of mixtures and preventing the formation of lumps and agglomerates, particularly when powders are added, due to their bulky construction, low torque-inertia ratio, and complex mechanisms.
Innovation Solution
A pasteurizing machine equipped with a brushless electric motor that directly drives the stirrer, allowing for high torque at low speeds, direct axis connection, and intermittent rotation with a cogging effect to enhance powder dispersion and air incorporation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If traditional motors with reduction gear units, belts, chains or toothed wheels are used to drive the stirrer, then the motor can provide sufficient torque for stirring, but the device becomes bulky and the torque-inertia ratio becomes very low requiring overdimensioned motors
Solution Approach 1:
The patent removes intermediate transmission components (reduction gear units, belts, chains, toothed wheels) from the motor-stirrer drive system. The motor shaft is connected directly to the stirrer shaft, extracting out the complex transmission mechanism while maintaining sufficient torque through direct coupling.
Solution Approach 2:
The motor shaft and stirrer shaft are merged into a single direct connection. The motor is positioned inside the container with its shaft directly coupled to the stirrer shaft, combining the drive function and stirring function into a unified structure without intermediate transmission elements.
2Stability of the object's composition
If discrete speed changes or reversal of rotation direction are applied during heating, then temperature homogenization is improved, but the percentage of air held within the mixture and dispersion of solids cannot be increased
Solution Approach 1:
The patent implements periodic reversal of the stirrer rotation direction at predetermined time intervals during the heating process. This periodic action creates intermittent turbulent flow patterns that enhance both temperature homogenization and air incorporation into the mixture, simultaneously achieving thermal uniformity and increased overrun.
Solution Approach 2:
The stirrer operation transitions from static continuous rotation to dynamic reversible rotation. The rotation direction changes periodically during heating, creating varying flow patterns that improve both thermal mixing and air incorporation, making the mixing process adaptive rather than fixed.
3Stability of the object's composition
If traditional continuous stirring is used during heating, then mixing occurs, but powder addition causes agglomeration and lumps form on the surface resisting wettability
Solution Approach 1:
The stirrer operates with periodic reversals rather than continuous unidirectional rotation. When powder is added, the periodic direction changes create intermittent flow patterns that prevent powder particles from settling and forming stable agglomerates on the surface, improving wetting and dispersion.
Solution Approach 2:
The periodic reversal of stirrer rotation creates mechanical disturbance and vibration in the liquid medium. This vibration prevents cohesive or hydrophobic powder particles from adhering to the surface and forming lumps, keeping them suspended and improving wettability by the liquid.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The machine achieves improved powder dispersion, higher overrun percentage, and better quality of the final product by preventing agglomeration and ensuring uniform mixing through controlled, pulsed stirring.
Implementation Method 1
a brushless electric motor (9), whose rotor (7) is connected directly to a stirring device (3a, 3b)
Implementation Method 2
The container is heated by a suitable heating system, comprising a heat exchanger associated with the container
Implementation Method 3
the stirrer (3a, 3b) which is driven in rotation to mix the product during the different stages of the treatment process
Data Source
AI summary
A pasteurizing machine for treating liquid or semi-liquid food base products, including:a container adapted to allow the liquid or semi-liquid base products to be processed and treated by pasteurization;a stirring device, mounted inside the container and driven by drive means to stir the mixture consisting of the liquid or semi-liquid base products;drive means, configured to drive the stirring device;a thermal treatment system, including an exchanger associated with the container to heat the mixture consisting of said liquid or semi-liquid base products inside the container;at least one control unit, adapted to control the operation of the drive means;wherein said drive means comprise a brushless electric motor provided with a rotor including permanent magnets for producing the magnetic field needed to generate the movement.