Piston-Driven Gas Ejector for Granule Discharge

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Solution Overview

Problem

Conventional ejecting devices that use high-speed rotating blades to discharge granules risk granule entrapment, leading to potential crushing and rotor stoppage.

Innovation Solution

A gas-based ejecting device with a cylinder tube, piston, and ejector mechanism that compresses and forcefully ejects gas to blow off granules, eliminating the need for high-speed rotation and reducing entrapment risks.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If high-speed rotating blades are used to eject granules, then ejection capability is improved, but granule entrapment and rotor stoppage risk increase

Engineering Contradiction:

Improveejection capabilityVSAvoidoperation stability

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent replaces the high-speed rotating blade mechanism with a pneumatic ejection system. Compressed gas is supplied into the cylinder tube to move the piston, which then forces gas through the ejector to blow off granules from the discharge port. This substitution eliminates mechanical contact between moving blades and granules, preventing entrapment and crushing while maintaining effective ejection capability.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The invention employs a pneumatic system where compressed gas is supplied into the cylinder tube, creating pressure that moves the piston forward. The piston then forces the compressed gas through the ejector, which directs a high-velocity gas stream to blow off granules. This pneumatic mechanism achieves reliable granule ejection without the mechanical contact problems of rotating blades.

Inventive Principle:

Principle #29Pneumatics and hydraulics

2Speed

If high-speed rotation is used to discharge granules, then discharge speed is improved, but granule crushing and entrapment increase

Engineering Contradiction:

Improvedischarge speedVSAvoidgranule damage

Core Design Contradiction:

SpeedVSObject-affected harmful factors

Solution Approach 1:

The patent replaces mechanical blade impact with pneumatic gas stream ejection. Compressed gas is forced through the ejector by the moving piston, creating a high-velocity gas flow that blows off granules without mechanical contact. This eliminates crushing and entrapment while achieving the required discharge speed.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The invention changes the ejection mechanism from mechanical impact to pneumatic pressure. By controlling the compressed gas pressure and flow rate through the ejector, the system achieves high discharge speed while avoiding the harmful mechanical forces that cause granule damage in rotating blade systems.

Inventive Principle:

Principle #35Parameter changes

3Force

If blades are used to forcefully eject granules, then ejection force is improved, but granule entrapment between blade tip and guide increases

Engineering Contradiction:

Improveejection forceVSAvoidentrapment risk

Core Design Contradiction:

ForceVSReliability

Solution Approach 1:

The patent replaces direct mechanical force from rotating blades with pneumatic force from compressed gas. The gas pressure moves the piston, which then forces gas through the ejector to blow off granules. This indirect pneumatic forcing mechanism eliminates the entrapment problem between blade tips and guides while maintaining sufficient ejection force.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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 device effectively ejects granules without the risk of entrapment, ensuring smooth operation and precise delivery to target positions.

Implementation Method 1

the gas supply and discharger supplies gas into the internal space of the cylinder tube to compress gas in the internal space

Methodology Applied

Scientific EffectGas compression: Compression

Implementation Method 2

Moving the piston in this state causes the ejector to forcefully eject compressed gas out of the cylinder tube for the gas to blow off a granule

Methodology Applied

Scientific EffectGas expansion and flow: Pressure Gradient

Data Source

PatentUS20250287863A1Ejecting device

Publication Date: 2025.09.18 KUBOTA CORP

AI summary

An ejecting device includes a cylinder tube, a piston slidable in the cylinder tube, and a gas supply and discharger switchable between a supply mode, in which the gas supply and discharger supplies gas into an internal space of the cylinder tube, and an open mode, in which the gas supply and discharger exposes the internal space to outside, and an ejector configured to, in response to a movement of the piston, eject gas out of the cylinder tube, which gas has been supplied to the internal space and compressed.