Radar Level Gauge Heat Path Layout for Cooler Transceivers
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Solution Overview
Problem
Radar level gauge systems face challenges in withstanding high temperatures, especially when operating at higher frequencies, as existing solutions like thermal insulation and heat-dissipating materials can complicate assembly and compactness.
Innovation Solution
A radar level gauge system design featuring a hollow waveguide with a heat-dissipating structure and thermal connections optimized to reduce heat conduction paths, where the first thermal connection has lower resistance than the second, allowing efficient heat dissipation and maintaining the transceiver's temperature within safe limits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If an adaptor made of material with poor thermal conductivity is arranged between the tank and measurement housing, then the measurement electronics are protected from high temperatures, but the device complexity and assembly difficulty increase
Solution Approach 1:
The harmful thermal conduction path is extracted and eliminated by removing the adaptor component entirely. The housing neck is designed to directly engage with the tank flange, taking out the intermediate thermal barrier component and replacing it with an integrated thermal management design using insulation material and heat-dissipating structure within the housing assembly.
Solution Approach 2:
Multiple functions are merged into the housing assembly: the housing neck provides both mechanical support and thermal management. The insulation material and heat-dissipating structure are integrated into the housing design, combining thermal protection and heat dissipation functions in a single integrated component rather than requiring separate adaptors.
2Temperature
If thermal insulation is applied to the housing neck and waveguide is divided into parts, then heat conduction to measurement electronics is reduced, but the device complexity and assembly difficulty increase
Solution Approach 1:
Thermal management measures are implemented in advance during the housing design phase. The insulation material is pre-positioned in the housing neck, and the heat-dissipating structure is integrated into the housing design before final assembly, eliminating the need for complex thermal management modifications during later assembly stages.
Solution Approach 2:
Thermal management is applied locally where needed rather than throughout the entire structure. Insulation material is placed specifically in the housing neck region where thermal conduction occurs, and the heat-dissipating structure is positioned at the optimal location on the housing to efficiently manage heat from the waveguide, providing targeted thermal control without unnecessary complexity.
3Volume of moving object
If higher measurement frequencies are used, then the radar level gauge system becomes more compact, but heat dissipation becomes more challenging
Solution Approach 1:
Heat dissipation is addressed by utilizing the radial dimension of the housing structure. The heat-dissipating structure extends radially outward from the housing, providing increased surface area for heat dissipation in the radial direction without increasing the axial length of the compact probe, thus maintaining compactness while improving thermal management.
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 design effectively reduces the temperature of the transceiver even at high tank temperatures, enhancing the system's heat resistance and compactness, making it easier to assemble and maintain.
Implementation Method 1
a thermal resistance of a first heat conduction path from the second end of the hollow waveguide through the first thermal connection to the heat-dissipating structure
Implementation Method 2
a thermal resistance of a second heat conduction path from the second end of the hollow waveguide through the second thermal connection to the housing
Implementation Method 3
a hollow waveguide for guiding the transmit signal in a signal propagation direction from a first end of the hollow waveguide facing the transceiver towards a second end of the hollow waveguide facing the antenna
Implementation Method 4
an antenna for radiating an electromagnetic transmit signal from the transceiver towards a surface of the product and for returning an electromagnetic reflection signal resulting from reflection of the electromagnetic transmit signal at the surface back towards the transceiver
Data Source
Figure 1~2
Figure 3
Figure 4
AI summary
A radar level gauge system comprising a transceiver; an antenna; a hollow waveguide for guiding the transmit signal from a first end facing the transceiver towards a second end facing the antenna; a housing including a heat-dissipating structure arranged at a first distance from the second end; a first thermal connection between the hollow waveguide and the heat- dissipating structure; and a second thermal connection between the hollow waveguide and the housing arranged at a second distance, shorter than the first distance, from the second end. The first thermal connection and the second thermal connection are dimensioned and arranged in such a way that a thermal resistance of a first heat conduction path from the second end of the hollow waveguide through the first thermal connection to the heat- dissipating structure, is lower than a thermal resistance of a second heat conduction path from the second end of the hollow waveguide through the second thermal connection to the housing.