Seeder Separating Wheel Sealing for Reliable Seed Ejection

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Solution Overview

Problem

Existing separating devices for seeders fail to efficiently maintain a pressure difference across perforations due to suboptimal sealing, leading to seeds not being ejected properly.

Innovation Solution

A separating device with radial projections that fit into perforations in a sealed manner, using shape matching and/or a sealing element, to enhance sealing efficiency and maintain pressure difference.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If a pin with clearance is inserted into the perforation and a seal rests against the disc wall without penetrating, then the device structure is simple, but the pressure difference is not efficiently interrupted and seeds may not be ejected properly

Engineering Contradiction:

Improvedevice structure simplicityVSAvoidpressure difference cut-off efficiency

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The invention changes the geometric parameters of the pin by providing radial projections that extend through the inner channel inlet with a specific protrusion length (0.5-2mm) beyond the disc wall. This parameter modification transforms the pin from a simple clearance fit component into an effective sealing element that physically blocks the internal channel, thereby efficiently interrupting the pressure difference and enabling reliable seed ejection.

Inventive Principle:

Principle #35Parameter changes

2Ease of manufacture

If the seal rests against the disc wall at the perforation entrance without penetrating, then the device is easy to manufacture, but the sealing time of perforations is insufficient

Engineering Contradiction:

Improvesealing structure simplicityVSAvoidsealing time of perforations

Core Design Contradiction:

Ease of manufactureVSDuration of action of moving object

Solution Approach 1:

The radial projections are pre-configured on the pin to extend beyond the disc wall surface. This preliminary structural arrangement ensures that when the pin reaches the insertion position, the projections are already positioned to block the internal channel inlet, providing immediate and effective sealing action for the required duration rather than relying on a seal that merely contacts the disc wall.

Inventive Principle:

Principle #10Preliminary action

3Reliability

If radial projections are inserted through the inner channel inlet to achieve sealing, then the pressure difference cut-off efficiency is optimized, but the device complexity increases

Engineering Contradiction:

Improvepressure difference cut-off efficiencyVSAvoidseparating device structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The invention merges the sealing function into the pin structure itself by adding radial projections directly to the pin body. This integration eliminates the need for separate sealing components (such as independent seals or gaskets) and combines the positioning and sealing functions into a single element, thereby achieving effective pressure difference cut-off without significantly increasing overall device complexity.

Inventive Principle:

Principle #5Merging (Combining)

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

Improves the sealing time of perforations, ensuring efficient ejection of seeds by optimizing the pressure difference cut-off, suitable for all types of seeds without altering the device dimensions.

Implementation Method 1

the radial projections are designed to be inserted through the inner channel inlet of one of the perforations in a sealing manner inside the inner channel by shape matching and/or by a sealing element in the insertion position to achieve sealing inside the inner channel

Methodology Applied

Scientific EffectSealing:

Implementation Method 2

The dispensing disc separates the housing into two chambers with different air pressures, creating a positive or negative pressure difference on either side of the perforated dispensing disc

Methodology Applied

Scientific EffectPressure difference: Pressure Gradient

Data Source

PatentUS20260020517A1Separating device for a distribution unit and associated seeder

Publication Date: 2026.01.22 KUHN SA

AI summary

A separating device for a distribution unit of granular elements counting a plurality of perforations each including an internal channel with an inlet and an outlet, including an separating wheel including a rotation axis and a peripheral surface, the separating wheel including a plurality of radial projections projecting from the peripheral surface, which are designed to be inserted into the internal channel of one of the perforations in an insertion position, wherein the radial projections are designed to be inserted through the inlet of the internal channel of one of the perforations in a sealing manner inside the internal channel by shape matching and/or by a sealing element in the insertion position so as to achieve sealing inside the internal channel.