Pasteurizing Machine With Brushless Stirring for Powder Dispersion
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Solution Overview
Problem
Existing pasteurizing machines fail to increase the overrun percentage of liquid or semi-liquid food products, leading to poor quality due to the formation of lumps and agglomerates, especially when powders are added, and require overdimensioned motors for torque and speed variations.
Innovation Solution
A pasteurizing machine equipped with a brushless electric motor that directly drives the stirrer, allowing for high torque at low speeds, intermittent rotation, and direction reversal, enhancing powder dispersion and air incorporation through a cogging effect.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If traditional motors with low torque-inertia ratio are used, then the motor size can be reduced, but high torques are needed for starting and speed variations, leading to overdimensioned motors and increased costs
Solution Approach 1:
The patent applies dynamic speed variation through a variable frequency drive system that continuously adjusts the stirrer speed during pasteurization. This dynamic control allows the system to achieve high torque only when needed (during starting and speed transitions) rather than requiring the motor to be continuously oversized, resolving the contradiction between torque requirements and motor size.
Solution Approach 2:
The patent changes the operational parameters by implementing intermittent stirring cycles with variable speed and direction. The motor operates at high torque only during brief acceleration and deceleration phases, then runs at lower speeds during mixing phases, allowing a smaller motor to deliver the same overall performance as a larger traditional motor would provide continuously.
2Quantity of substance
If the mixture viscosity is increased to hold higher percentage of air, then the overrun improves, but the dispersion of cohesive or hydrophobic powder becomes more difficult, leading to lump formation
Solution Approach 1:
The patent implements periodic intermittent stirring cycles where the stirrer alternates between rotating and stationary phases. During rotation, powder is dispersed; during stationary phases, air is incorporated into the mixture. This periodic action sequence allows both powder dispersion and air incorporation to occur effectively without one compromising the other, resolving the contradiction between viscosity increase for air holding and powder dispersion difficulty.
3Manufacturing precision
If a mechanism for reversing rotation direction is added, then powder dispersion and air incorporation are improved, but the constructional complexity increases
Solution Approach 1:
The patent replaces complex mechanical reversal mechanisms with an electrical control system. A variable frequency drive electronically controls the motor to reverse rotation direction without requiring mechanical gears, clutches, or other reversing mechanisms. This substitution maintains the benefit of bidirectional stirring for improved powder dispersion and air incorporation while eliminating the constructional complexity of mechanical reversal systems.
4Stability of the object's composition
If discrete speed changes are applied during heating, then temperature homogenization is improved, but the motor requires higher power to achieve speed variations in acceptable time frame
Solution Approach 1:
The patent uses dynamic speed control with a variable frequency drive that optimizes the speed variation profile. Instead of abrupt discrete speed changes that require high peak power, the system implements smooth, continuous speed transitions that achieve the same temperature homogenization effect with lower instantaneous power demands, resolving the contradiction between temperature homogeneity and motor power requirements.
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, prevents lump formation, and increases the overrun percentage, resulting in higher-quality finished products by optimizing the mixing process.
Implementation Method 1
brushless electric motor that directly drives the stirrer, allowing for high torque at low speeds
Implementation Method 2
intermittent rotation, and direction reversal, enhancing powder dispersion and air incorporation through a cogging effect
Implementation Method 3
The container is heated by a suitable heating system, comprising a heat exchanger associated with the container
Implementation Method 4
enhancing powder dispersion and air incorporation through a cogging effect
Data Source
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AI summary
A pasteurizing machine (1) for treating liquid or semi-liquid food base products, comprising: - a container (2a, 2b) adapted to allow the liquid or semi-liquid base products to be processed and treated by pasteurization; - a stirring device (3a, 3b), mounted inside the container (2a, 2b) and driven by drive means (4) to stir the mixture consisting of said liquid or semi-liquid base products; - drive means (4), configured to drive the stirring device (3a, 3b); - a thermal treatment system (5), comprising an exchanger (6) associated with the container (2a, 2b) to heat the mixture consisting of said liquid or semi-liquid base products inside said container (2a, 2b); - at least one control unit (10), adapted to control the operation of said drive means (4); characterized in that said drive means (4) comprise a brushless electric motor (9) provided with a rotor (7) comprising permanent magnets (18) for producing the magnetic field needed to generate the movement.