Rotary Cooling Member for Additive Injection Valve Bubble Removal

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Solution Overview

Problem

Existing cooling devices for injection valves face inefficiencies due to bubble formation, which acts as a heat insulating layer and reduces the cooling efficiency, especially at the tip portion where temperature increases easily.

Innovation Solution

A cooling device with a rotary member surrounding the injection valve, featuring a rotation imparting part that rotates due to coolant flow, generating a swirl flow to remove bubbles and enhance cooling efficiency by converting kinetic energy into rotational energy.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Temperature

If a guide is used to guide cooling water to the distal end of the injection valve, then the cooling water can reach the tip portion, but bubbles form in the passage and act as a heat insulating layer, reducing cooling efficiency

Engineering Contradiction:

Improvetemperature of injection valveVSAvoidcooling efficiency

Core Design Contradiction:

TemperatureVSReliability

Solution Approach 1:

The patent applies the dynamics principle by introducing a rotary member that rotates around the injection valve. The rotary member converts the linear flow of cooling water into rotational motion, creating a swirl flow that dynamically removes bubbles from the passage. This dynamic approach transforms the static cooling system into an active one that continuously clears bubbles, resolving the contradiction between reaching the distal end and maintaining cooling efficiency.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent applies pneumatics and hydraulics principle by utilizing the hydraulic flow of cooling water to drive the rotation of the rotary member. The kinetic energy of the flowing coolant is converted into rotational energy, which generates a swirl flow that effectively removes bubbles. This hydraulic approach eliminates the need for additional mechanical components while achieving bubble removal and maintaining high cooling efficiency.

Inventive Principle:

Principle #29Pneumatics and hydraulics

2Reliability

If cooling water flows through the passage, then the injection valve is cooled, but bubble formation occurs and reduces the overall cooling efficiency

Engineering Contradiction:

Improvecooling efficiencyVSAvoidbubble formation

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The patent applies the 'blessing in disguise' principle by converting the harmful effect of bubble formation into a beneficial one. The bubbles that would normally insulate and reduce cooling efficiency are instead used to drive the rotation of the rotary member through the swirl flow. This rotational motion then removes the bubbles from the passage, transforming the harmful insulating effect into a useful mechanism for bubble removal and enhanced cooling.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

3Productivity

If the coolant flow velocity is increased to improve cooling, then cooling efficiency improves, but bubble formation becomes more severe

Engineering Contradiction:

Improvecooling efficiencyVSAvoidbubble formation

Core Design Contradiction:

ProductivityVSObject-generated harmful factors

Solution Approach 1:

The patent applies dynamics by introducing rotational motion to the coolant flow. The rotary member creates a swirl flow that separates the harmful bubble formation effect from the beneficial cooling effect. The rotational dynamics enable the system to tolerate higher flow velocities without proportional increases in bubble-related problems, as the swirl flow continuously removes bubbles even at high velocities.

Inventive Principle:

Principle #15Dynamics

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 swirl flow effectively removes bubbles and increases the overall flow velocity of the coolant, improving the cooling efficiency of the injection valve, particularly at the tip portion where temperature rises quickly.

Implementation Method 1

a rotation imparting part that causes the rotary member to rotate about the injection valve in response to a flow of the coolant

Methodology Applied

Scientific EffectKinetic energy to rotational energy conversion:

Implementation Method 2

a cooling device configured to cool, using a coolant, an injection valve that injects an additive

Methodology Applied

Scientific EffectThermal conduction: Conduction (thermal)

Data Source

PatentUS10753253B2Cooling device for additive injection valve

Publication Date: 2020.08.25 DENSO CORP

AI summary

A cooling device configured to cool, using a coolant, an injection valve that injects an additive includes a rotary member surrounding an outer periphery of the injection valve and extending along the injection valve. The rotary member is supported to be rotatable around the injection valve. A clearance between an outer peripheral surface of the injection valve and an inner peripheral surface of the rotary member defines a passage through which the coolant flows. The rotary member has a rotation imparting part that causes the rotary member to rotate about the injection valve in response to a flow of the coolant.