Vortex Tube Housing Temperature Control for Process Field Devices
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Solution Overview
Problem
Process control field devices are vulnerable to extreme temperature conditions due to their components being designed for moderate environments, and existing protective housings are ineffective in preventing temperature-related operational issues.
Innovation Solution
A temperature control apparatus featuring a vortex tube and a flow control valve, where the vortex tube separates compressed fluid into cold and hot streams, and the flow control valve selectively directs these streams to maintain optimal internal housing temperatures using a temperature sensing feature and movable control element.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If process control field devices are used in extreme temperature environments, then the device can operate in a wider range of conditions, but the components inside the housing are affected by temperature extremes and fail to operate properly
Solution Approach 1:
The patent introduces a temperature control device as an intermediary system between the external extreme temperature environment and the internal housing environment. This device includes a vortex tube that receives compressed air and separates it into hot and cold streams, and a flow control valve that selectively directs these temperature-adjusted air streams into the housing to maintain components within their optimal operating temperature range, thus protecting reliability while enabling operation in extreme environments
Solution Approach 2:
The patent changes the temperature parameter of the internal housing environment by introducing a temperature control device. The vortex tube generates temperature extremes (hot and cold air streams) from compressed air, and the flow control valve regulates the mixture and direction of these streams to maintain the internal temperature within the optimal range for component operation, even when external temperatures vary widely
2Temperature
If a temperature control device with vortex tube and flow control valve is added to the housing, then internal temperature can be regulated, but the device complexity increases
Solution Approach 1:
The temperature control device is designed to be self-regulating through a temperature sensing feature that automatically detects internal housing temperature and controls the flow control valve accordingly. The system uses the existing compressed air supply (already present in process control environments) as its energy source, eliminating the need for external power or complex control systems, thus reducing overall complexity while maintaining effective temperature regulation
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
Effectively regulates the internal atmosphere temperature of process control devices, ensuring operational usability across a wide range of extreme temperatures, from -100°C to 200°C, by selectively directing cold or hot air into the housing based on sensed temperature conditions.
Implementation Method 1
The vortex tube can have a vortex inlet for receiving a compressed fluid, a first vortex outlet for discharging fluid from the vortex tube at a first temperature, and a second vortex outlet for discharging fluid from the vortex tube at a second temperature that is higher than the first temperature
Implementation Method 2
The temperature sensing feature can include a reservoir of a control fluid that expands in response to an increase in the temperature of the atmosphere internal to the housing and contracts in response to a decrease in the temperature of the atmosphere internal to the housing
Data Source
AI summary
A process control apparatus includes a housing, a process control device disposed in the housing, and a temperature control device operably coupled to the housing for regulating a temperature of an atmosphere internal to the housing. The temperature control device includes a vortex tube and a flow control valve. The flow control valve is coupled to the vortex tube and includes a temperature sensing feature configured to sense a temperature of an atmosphere internal to the housing and configured to move a control element of the flow control valve based on the sensed temperature between a plurality of positions to selectively direct the flow of fluid from the first and second vortex outlets to the atmosphere internal to the housing.