In-Line Heater Sealing and Level Sensing for Fluid Purity
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Solution Overview
Problem
Existing in-line fluid heaters contaminate process fluids due to wetted threads and O-rings, and liquid level sensors provide unreliable readings if not properly installed or calibrated, posing challenges in maintaining fluid purity and preventing device damage from dry operation.
Innovation Solution
An in-line fluid heater design featuring a fluid seal between the vessel wall and pass-through fittings, eliminating threads and O-rings, and a specialized bracket to maintain a fixed distance for liquid level sensors, ensuring accurate readings and preventing device damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If standard threaded fittings are used to allow wire passage into the heating vessel, then electrical connectivity is achieved, but fluid leakage and contamination occur through the threads
Solution Approach 1:
The patent removes the threaded connection from the fluid path by extracting the sealing function to a separate location. The fitting includes a sealed bore that receives the wire, and the sealing surface is positioned at the interface between the fitting and vessel wall, away from the threaded portion. This separates the electrical connection function from the fluid sealing function, eliminating thread contamination.
Solution Approach 2:
The patent introduces a sealed bore as an intermediary structure between the wire and the vessel interior. This bore provides a protected pathway for the wire to pass through the vessel wall while maintaining fluid tightness. The sealed bore acts as a mediator that allows electrical connectivity without compromising fluid seal integrity.
2Reliability
If O-rings are added to isolate fitting threads, then thread wetting is prevented, but additional wetted material introduces contamination risk
Solution Approach 1:
The patent extracts the sealing function from O-rings and integrates it into the fitting structure itself. The fitting includes a sealed bore with integrated sealing surfaces that mate with the vessel wall, eliminating the need for separate O-ring components. This removes the O-ring material from the fluid path while maintaining thread isolation.
3Measurement precision
If liquid level sensor is placed close to tubing for accurate readings, then sensor calibration is sensitive to installation variations and tubing movement
Solution Approach 1:
The patent performs preliminary action by pre-calibrating the sensor at its final installed position during manufacturing. The sensor is mounted on a bracket that positions it at a specific distance from the tubing, and calibration is completed before the device is shipped. This preliminary calibration eliminates installation variability and ensures consistent readings throughout the device's operational life.
4Ease of operation
If heating element is operated without liquid present, then device can be powered on, but heating element burns out due to insufficient heat dissipation
Solution Approach 1:
The patent implements feedback by using the liquid level sensor to monitor the presence of liquid and automatically control the power supply to the heating element. When liquid is detected, the sensor signals the control system to enable power; when liquid is absent, power is automatically cut off. This closed-loop feedback system prevents dry operation while maintaining ease of use.
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 maintains fluid purity by creating a liquid-tight seal and prevents device damage by ensuring consistent liquid flow, enhancing the reliability of liquid level sensor readings and operation.
Implementation Method 1
In-line fluid heaters containing an encapsulated electric immersion heater
Implementation Method 2
A liquid seal is created between the wall of the heating vessel and the pass-through fitting
Data Source
AI summary
An in-line heater having a heating vessel, defined at least in part by a wall, through which fluid to be heated flows. The wall of the vessel has at least one port formed therein. A fitting, having a body defining a pass-through passageway, is attachable to the port. An end of the body of the fitting has a groove or a ring which mates with a corresponding ring or groove of the port to form a liquid seal between the end of the fitting and the wall of the heating vessel.