Ultrasonic Urea Sensor Shock Damping and Bubble Removal

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Solution Overview

Problem

Existing ultrasonic liquid concentration detecting devices face challenges in measurement accuracy due to external vibrations, probe damage, high temperatures, and bubble attachment, leading to inaccurate urea concentration readings in SCR systems, which can result in insufficient or excessive NH3 pollution and catalyst contamination.

Innovation Solution

The ultrasonic liquid concentration detecting device incorporates a vibrating structure to buffer external vibrations and a bubble removing structure that accelerates liquid flow, reducing signal attenuation and improving precision by ejecting bubbles away from the ultrasonic emitting and receiving surfaces.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If the ultrasonic liquid concentration detecting device is used in vehicle exhaust systems, then it can detect urea concentration in real-time, but the probe is subjected to external vibrations and shocks during vehicle operation which can cause probe damage and measurement inaccuracy

Engineering Contradiction:

Improveurea concentration measurement accuracyVSAvoidprobe service life and measurement reliability

Core Design Contradiction:

Measurement precisionVSReliability

Solution Approach 1:

The patent applies beforehand cushioning by installing a shock-absorbing structure that includes a rubber buffer and a spring buffer between the probe and the mounting bracket. These cushioning elements are pre-installed to absorb external vibrations and shocks during vehicle operation, protecting the probe from damage and maintaining measurement reliability in the harsh exhaust environment

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

2Measurement precision

If liquid is added to the measurement cavity, then the ultrasonic generating and receiving surfaces can be covered, but bubbles attach to the surfaces causing significant attenuation of ultrasonic signals and inaccurate concentration measurement

Engineering Contradiction:

Improveconcentration measurement accuracyVSAvoidbubble attachment to ultrasonic surfaces

Core Design Contradiction:

Measurement precisionVSObject-affected harmful factors

Solution Approach 1:

The patent converts the harmful effect of bubbles into a beneficial outcome by using the liquid flow itself to remove bubbles. The liquid flow, which would normally cause bubble formation, is directed to create a sweeping action that detaches and removes bubbles from the ultrasonic generating and receiving surfaces, thereby eliminating signal attenuation and improving measurement accuracy

Inventive Principle:

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

3Strength

If the probe is subjected to big impact during vehicle operation, then it can withstand the shock, but a large shift of the measured acoustic wave arises leading to inaccurate concentration measurement

Engineering Contradiction:

Improveprobe shock resistanceVSAvoidacoustic wave measurement accuracy

Core Design Contradiction:

StrengthVSMeasurement precision

Solution Approach 1:

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

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 solution prolongs the service life of the probe and enhances measurement precision, ensuring accurate urea concentration detection and compliance with emission standards by minimizing the impact of external vibrations and bubble interference.

Implementation Method 1

an ultrasonic generating device and an ultrasonic receiving device for detecting a concentration of the liquid through emission and reception of ultrasonic waves

Methodology Applied

Scientific EffectUltrasonic wave propagation: Ultrasound

Implementation Method 2

a vibrating structure configured to buffer an external vibration

Methodology Applied

Scientific EffectVibration damping: Damping

Implementation Method 3

a bubble removing structure configured to accelerate a flow rate of the liquid

Methodology Applied

Scientific EffectFluid flow acceleration: Jet

Data Source

PatentEP3611499B1Shock structure, bubble removing structure, and ultrasonic liquid concentration testing device

Publication Date: 2024.06.05 DONG GUAN ZHENGYANG ELECTRONIC MECHANICAL LTD

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AI summary

Provided is an ultrasonic liquid concentration detecting device including a vibrating structure, a bubble removing structure, and an ultrasonic detecting main body. The vibrating structure is disposed at the bottom of the ultrasonic detecting main body and is configured to buffer a shock received by the ultrasonic detecting main body. The bubble removing structure is disposed on the ultrasonic detecting main body and is configured to accelerate the flow rate of a liquid. The ultrasonic detecting main body is configured to detect a concentration of the liquid. Further provided are a bubble removing device and a vibrating structure for an ultrasonic liquid concentration detecting device.