Probe Housing Nozzle Shape for Hot Gas Sensor Cooling

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Solution Overview

Problem

Existing probe designs for hot gas installations are complex, susceptible to leakage, and inefficient in cooling and flushing, leading to irregular cooling and increased contamination at the sensor outlet.

Innovation Solution

A compact probe housing with circumferentially distributed coolant conduits, a flushing medium conduit, and a sensor lead-through hole, where the flushing medium outlet line has a tapering cross section to form a nozzle shape, enhancing cooling and flushing efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If an exchangeable probe head with multiple conduits is used, then the probe can provide both cooling and flushing functions, but the structure becomes complex and large

Engineering Contradiction:

Improvecooling and flushing functionalityVSAvoidstructure complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent combines the probe head and sensor housing into a single integrated unit, eliminating the need for exchangeable probe heads. The sensor is permanently housed in the probe body with integrated cooling and flushing conduits, simplifying the overall structure while maintaining all necessary functions.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The probe housing is designed with multiple conduits serving different functions: cooling conduits for heat dissipation, flushing conduits for sensor cleaning, and a lead-through hole for sensor insertion. This multi-functional design eliminates the need for separate exchangeable components.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Adaptability or versatility

If an exchangeable probe head design is used, then different sensors can be adapted, but the probe size increases and makes it intrusive to hot gas flow

Engineering Contradiction:

Improvesensor adaptabilityVSAvoidprobe size

Core Design Contradiction:

Adaptability or versatilityVSLength of moving object

Solution Approach 1:

The sensor is permanently integrated into the probe housing with a dedicated lead-through hole, eliminating the need for exchangeable probe heads and reducing the overall probe size and intrusiveness into hot gas flow.

Inventive Principle:

Principle #5Merging (Combining)

3Ease of operation

If flushing air is supplied concentrically to the sensor outlet, then the sensor can be cleaned, but vortex formation causes increased contamination

Engineering Contradiction:

Improveflushing capabilityVSAvoidcontamination at sensor outlet

Core Design Contradiction:

Ease of operationVSObject-affected harmful factors

Solution Approach 1:

The flushing conduit is positioned asymmetrically relative to the sensor outlet, with its outlet arranged tangentially or at an angle rather than concentrically. This asymmetric arrangement prevents vortex formation and reduces contamination at the sensor outlet.

Inventive Principle:

Principle #4Asymmetry

4Volume of stationary object

If not all circumferential conduits are used for cooling, then space is saved, but irregular cooling of the probe and sensor occurs

Engineering Contradiction:

Improveprobe housing spaceVSAvoidcooling uniformity

Core Design Contradiction:

Volume of stationary objectVSStability of the object's composition

Solution Approach 1:

The cooling conduits are strategically positioned and sized to provide adequate cooling at critical locations such as the sensor housing and probe body, rather than uniformly distributing all conduits for cooling purposes. This allows irregular but sufficient cooling patterns that maintain sensor functionality.

Inventive Principle:

Principle #3Local quality

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 design achieves effective protection against hot gas flow, improved heat dissipation, and reduced contamination, while maintaining a compact and space-saving structure.

Implementation Method 1

The probe bodies comprise cooling devices via which the probe bodies and the sensor technology housed therein can be cooled

Methodology Applied

Scientific EffectHeat transfer: Conduction (thermal)

Implementation Method 2

a flushing medium conduit (9) and a sensor lead-through hole (7), which extend at least partly parallel to one another

Methodology Applied

Scientific EffectFluid flow:

Implementation Method 3

The invention is characterized in that the flushing medium outlet line (10) has a tapering cross section to form a nozzle shape

Methodology Applied

Scientific EffectNozzle effect: Venturi Effect

Data Source

PatentUS20250102483A1Probe Housing and Probe Device Having a Sensor and a Probe Housing

Publication Date: 2025.03.27 DEUTSCHES ZENTRUM FÜR LUFT UND RAUMFAHRT E V

AI summary

The invention relates to a probe housing for accommodating sensors, including a plurality of coolant conduits distributed in the circumferential direction; at least one flushing medium conduit; and a sensor lead-through hole. The sensor lead-through hole extends at least partially parallel to the at least one flushing medium conduit; and a sensor receptacle into which the sensor lead-through hole opens. The sensor receptacle has a measuring section opening, and the sensor receptacle has a flushing medium outlet conduit having a flushing medium outlet which is connected to the at least one flushing medium conduit, and the flushing medium outlet conduit has a tapering cross-section to form a nozzle shape.