Electric Machine Gas Escape Detection via Siphon Water Accumulator
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Solution Overview
Problem
Existing electric machines face reliability issues due to potential gas escape from the casing via the dryer, which can lead to reduced cooling capabilities and machine trips if the float valve fails to close properly, causing unintended gas discharge.
Innovation Solution
Incorporating a siphon-based water accumulator with a detector and a gas trap downstream of the water accumulator to facilitate quick detection of gas escape and ensure reliable operation by displacing water with gas in case of float valve failure, allowing for easy identification of float valve malfunctions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a float valve is used to discharge water from the heat exchanger, then water removal is achieved, but gas escape may occur if the float valve fails to close properly
Solution Approach 1:
A gas trap is introduced as an intermediary component between the heat exchanger and the float valve. This gas trap acts as a safety barrier that prevents gas from escaping through the water discharge line, even if the float valve fails. The gas trap captures any gas that passes through and redirects it back into the heat exchanger, thus mediating the harmful effect of potential float valve failure.
Solution Approach 2:
The gas trap is installed in advance as a protective measure against float valve failure. It provides a cushioning effect by capturing gas before it can escape externally, thereby preventing the harmful consequences of gas pressure drop and machine trip. This beforehand cushioning ensures that even if the float valve fails, the gas escape is contained and redirected.
2Measurement precision
If a detector is added to detect gas in the water line, then gas escape detection is improved, but device complexity increases
Solution Approach 1:
The detector serves as an intermediary sensing device that monitors the water line for the presence of gas. It provides early warning of float valve failure by detecting gas bubbles in the water discharge line, allowing operators to take corrective action before significant gas escape occurs. The detector mediates between the potential failure mode and the control system.
Solution Approach 2:
The detector provides feedback about the state of the water discharge line by monitoring for gas presence. This feedback mechanism enables early detection of float valve malfunction, allowing the system to respond appropriately. The feedback loop enhances measurement precision for gas escape detection while keeping the added complexity minimal through simple binary detection.
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
Enables rapid detection of gas escape and prevents pressure drops within the electric machine, maintaining reliable cooling and preventing machine trips by using a siphon-based water accumulator to detect and manage water accumulation and displacement.
Implementation Method 1
Incorporating a siphon-based water accumulator with a detector and a gas trap downstream of the water accumulator to facilitate quick detection of gas escape and ensure reliable operation by displacing water with gas in case of float valve failure
Implementation Method 2
Condensation dryers have a heat exchanger; warm and potentially humid gas coming from the electric machine enters the heat exchanger at one side thereof and cooled gas exits at the other side thereof. During operation the heat exchanger cools the gas causing humidity condensation; water drops separate from the gas
Data Source
Figure 1~2
Figure 3
AI summary
The electric machine (1) has a casing (2) housing a stator (3) and a rotor (4) and containing a gas, and a dryer (5) for the gas. The dryer (5) is connected to the casing (2). The dryer (5) includes a separation group (12), for separating humidity from the gas, a water accumulator (13), for at least temporally accumulating water discharged from the separation group (12), at least a detector (14) for the water contained in the water accumulator (13).