Sifter With Drum And Stirring Rotor For Powder Dispersion
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Solution Overview
Problem
Conventional sifters suffer from inefficient sieving due to a large sieving chamber space, leading to excessive load on partial screen areas, reduced sieving efficiency, and accelerated screen deterioration, as well as issues with powder separation in mixtures of varying grain sizes and high pressure loss.
Innovation Solution
A sifter design featuring a rotating shaft with a drum of larger diameter than the shaft, a cylindrical sieve, and rotating blades attached to the drum's outer circumference, which narrows the sieving chamber space, increases the effective screen area, and ensures homogeneous powder dispersion, reducing pressure loss and powder retention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the sieving chamber has a large space to enable large powder flow, then the powder flow capacity is improved, but the screen area utilization deteriorates and screen life is reduced
Solution Approach 1:
The invention divides the sieving chamber into multiple zones by installing partition plates that create separate sieving sections. This segmentation allows the powder flow to be distributed across different screen areas, preventing concentration of load on single zones while maintaining overall large capacity. The partition plates effectively split the chamber volume to achieve both high throughput and balanced screen utilization.
2Device complexity
If the rotating shaft has a fixed small diameter, then the device structure is simplified, but the effective screen area is reduced and sieving efficiency deteriorates
Solution Approach 1:
The invention extends the rotating shaft in the axial direction to increase its length while maintaining a reasonable diameter. This dimensional change allows the shaft to support rotating blades that can reach and utilize the full screen area, including regions that would otherwise be inaccessible. The extended shaft configuration enables comprehensive screen coverage without requiring an excessively large shaft diameter, thus maintaining structural simplicity while dramatically improving sieving efficiency.
3Quantity of substance
If the sieving chamber has excessive space, then the powder flow capacity is improved, but the powder becomes localized and sieving efficiency deteriorates
Solution Approach 1:
The invention installs partition plates at specific locations within the sieving chamber to create localized flow channels and distribution zones. These partitions strategically guide powder flow to different screen sections, ensuring homogeneous distribution across the entire screen area. The local structural modifications through partitioning transform the excessive chamber space into controlled flow paths that maintain both high capacity and efficient sieving across all zones.
4Device complexity
If conventional sifters are used for powder mixtures of various grain sizes, then the sieving process is simple, but powder separation occurs and quality deteriorates
Solution Approach 1:
The invention employs rotating blades mounted on the extended shaft that periodically agitate and redistribute the powder mixture across the screen surface. This periodic mechanical action prevents particles of different grain sizes from segregating during the sieving process. The rotating blades continuously mix and redistribute the powder, ensuring that all size fractions remain uniformly distributed and pass through the screen together, thereby maintaining the original mixture composition and quality.
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
This design enhances sieving efficiency, extends the life of the sieve, and prevents powder separation in mixtures of varying grain sizes, improving the quality and yield of the sifted powder while reducing air usage.
Implementation Method 1
a stirring rotor located in an inner area of the sieving chamber inside the sieve comprising a plurality of rotating blades attached to the rotating shaft to push the material to be sifted from the inner area to an outer area of the sieving chamber outside the sieve
Implementation Method 2
the drum attached to the rotating shaft narrows the space of the sieving chamber to reduce the pressure loss and decrease the amount of gas (air) used for sieving
Implementation Method 3
a cylindrical sieve located inside the sieving chamber and arranged coaxially with the rotating shaft
Data Source
AI summary
A sifter comprising: a receiver having a supply chamber; a sieve assembly having a sieving chamber coupled to the supply chamber; a rotor having a rotating shaft laterally arranged to pass through the supply chamber and the sieving chamber; a drum having a circular cross-section and having a larger diameter than the diameter of the rotating shaft, the drum being extended in at least space of the sieving chamber and arranged coaxially with the sieve; a cylindrical sieve located inside the sieving chamber and arranged coaxially with the rotating shaft; a stirring rotor located in an inner area of the sieving chamber inside the sieve comprising a rotating blade attached to the rotating shaft; an extraction member; and an outlet for discharging powder passing through the sieve from the inner area to the outer area.