Flushing Circuit Orifice Layout for Stable Fluid-Pressure Cooling

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Solution Overview

Problem

The existing fluid pressure drive devices require significant labor and time to adjust the cooling ability of the flushing circuit, leading to pulsation in the flushing flow rate and potential vibration due to the complexity of relief valve adjustments.

Innovation Solution

A fluid pressure drive device with a low pressure selection valve and a flushing passage featuring a first orifice and a bent portion, allowing for easy adjustment of the flushing flow rate by replacing the orifice, which reduces negative pressure and stabilizes the cooling ability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If a relief valve is used to adjust the cooling ability of the flushing circuit, then the cooling ability can be adjusted, but the adjustment requires significant labor and time due to the large number of parts

Engineering Contradiction:

Improveadjustment of cooling abilityVSAvoidtime for adjustment

Core Design Contradiction:

Ease of operationVSLoss of time

Solution Approach 1:

The relief valve is divided into a valve body and a separately replaceable valve core. This segmentation allows the valve core to be quickly removed and replaced without disassembling the entire valve, significantly reducing adjustment time and labor while maintaining the ability to adjust cooling ability by selecting different valve cores with different flow characteristics

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The valve core is extracted as a separate, independently replaceable component from the valve body. This extraction enables rapid replacement of the valve core to adjust the flushing flow rate without requiring complex disassembly operations, directly addressing the time and labor consumption issue

Inventive Principle:

Principle #2Taking out (Extraction)

2Ease of operation

If a relief valve is used to control the flushing flow rate, then the cooling ability can be adjusted, but pulsation occurs in the flushing flow rate due to negative pressure on the downstream side

Engineering Contradiction:

Improveadjustment of flushing flow rateVSAvoidstability of flushing flow rate

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

A bent portion is introduced as an intermediary structure in the flushing passage downstream of the orifice. This bent portion acts as a flow stabilizer that dissipates negative pressure fluctuations and prevents pulsation, thereby improving the reliability and stability of the flushing flow rate while maintaining the ease of adjustment through orifice replacement

Inventive Principle:

Principle #24Intermediary (Mediator)

3Temperature

If the relief valve settings are adjusted to change cooling ability, then the cooling performance can be optimized, but vibration may occur in the pipe due to flow pulsation

Engineering Contradiction:

Improvecooling abilityVSAvoidpipe vibration

Core Design Contradiction:

TemperatureVSObject-affected harmful factors

Solution Approach 1:

The bent portion serves as a flow conditioning intermediary that smooths out pressure fluctuations and eliminates pulsation before the fluid reaches the pipe system. This intermediary structure allows the relief valve to maintain its cooling optimization function while preventing the harmful vibration effect from propagating to the pipe

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The negative pressure that causes pulsation and vibration is converted into a beneficial flow stabilizing effect through the bent portion. The bent structure transforms the harmful pressure fluctuations into a stabilizing flow pattern, turning the potential harm into a benefit for system stability

Inventive Principle:

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

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 configuration enables easy adjustment of the flushing flow rate, suppresses pulsation, and prevents pipe vibration, thereby simplifying the process and reducing costs.

Implementation Method 1

a low pressure selection valve provided between the pair of main passages and configured to be switched by a pressure difference between the pair of main passages

Methodology Applied

Scientific EffectPressure difference: Pressure Gradient

Implementation Method 2

the flushing passage has a first orifice and a bent portion formed on the downstream side of the first orifice... due to generation of negative pressure on the downstream side of the relief valve, pulsation occurs in a flushing flow rate

Methodology Applied

Scientific EffectPulsation suppression through bent portion geometry:

Data Source

PatentEP3686441B1Fluid-pressure driving device

Publication Date: 2024.04.03 KYB CORP

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AI summary

A fluid pressure drive 100 device includes a flushing circuit (10) configured to discharge a working fluid from one of the pair of main passages (2, 3) to a tank (5). The flushing circuit (10) has a low pressure selection valve (11) provided between the pair of main passages (2, 3) and configured to be switched by a pressure difference between the pair of main passages (2, 3), the low pressure selection valve (11) being configured to select the main passage on the low pressure side; and a flushing passage (12) configured to lead the working fluid passing through the low pressure selection valve (11) to the tank (5). The flushing passage (12) has a first orifice (50) and a bent portion (51) formed on the downstream side of the first orifice (50).