Resin Insulated Flowmeter Case Blocks Heat Transfer
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Solution Overview
Problem
Conventional impeller-type flowmeters face issues with temperature fluctuations, leading to heat convection and potential condensation, which can cause the magnetic sensor to malfunction due to rusting of conducting wires.
Innovation Solution
The flowmeter design includes a metallic body with a resin-insulated coil and amplifier case connection, a heat-resistant material-filled coil case, and a resin bearing to prevent direct temperature transfer and convection, ensuring stable operation across a wide temperature range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a heat insulating air chamber is provided between the measuring chamber and the magnetic sensor, then direct heat conduction from the fluid is prevented, but convection occurs in the air chamber causing heat to be transmitted to the sensor accommodation chamber
Solution Approach 1:
A resin case with insulating material is introduced as an intermediary component between the coil case (containing the magnetic sensor) and the amplifier case. This resin case acts as a thermal barrier that prevents both conduction and convection pathways for heat transfer, thereby blocking the harmful thermal effects from reaching the magnetic sensor while allowing the sensor to function normally.
2Object-affected harmful factors
If the sensor accommodation chamber is isolated with air chambers, then heat conduction is reduced, but condensation occurs on the chamber walls when fluid temperature drops abruptly
Solution Approach 1:
The resin case serves as a thermal insulation intermediary that prevents abrupt temperature changes from reaching the magnetic sensor and its conducting wires. By blocking the thermal pathway, it prevents the chamber walls from cooling below the dew point, thereby eliminating condensation and subsequent rusting of the conducting wires.
Solution Approach 2:
The resin case is made of synthetic resin material that combines thermal insulation properties with structural integrity. This composite material approach provides both thermal protection and mechanical support, creating a barrier that prevents condensation while maintaining the structural requirements of the flowmeter housing.
3Strength
If metal components are used for the coil case and body, then structural strength is ensured, but thermal conductivity causes temperature transfer to the amplifier circuit board
Solution Approach 1:
The resin case acts as a thermal intermediary that decouples the thermal pathways between metal components. While the metal coil case and body maintain their structural strength, the resin case interrupts the thermal conduction path, preventing excessive heat transfer to the amplifier circuit board and enabling the system to operate across a wide temperature range.
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 prevents heat transfer and condensation, maintaining accurate signal detection and extending the operational lifespan of the flowmeter by buffering against temperature changes and reducing noise interference.
Implementation Method 1
a resin case that is made of resin and includes an insulation material therein... since the insulation material is provided inside the case, no convection of air occurs in the space inside the case, and when a high temperature fluid flows through the flow path, the heat transfer to the amplifier circuit board can be prevented
Implementation Method 2
when a low temperature fluid flows through the flow path, condensation of the amplifier circuit board can be prevented
Data Source
AI summary
A flowmeter includes a metallic body that has a flow path therein, an impeller that is rotatably supported in the flow path inside the body, a pickup coil that is configured to detect a number of rotations of the impeller, the pickup coil being disposed outside the body, a coil case that is made of metal, and accommodates the pickup coil, an amplifier circuit board that is configured to amplify a detection signal of the pickup coil, and an amplifier case that is made of resin, and accommodates the amplifier circuit board. The coil case and the amplifier case are connected via a resin case that is made of resin and includes an insulation material therein.