Relay Contact Temperature Sensing for Early Failure Detection
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Solution Overview
Problem
Existing electromechanical relays lack effective and timely temperature monitoring capabilities, particularly at the contact points, which can lead to failure in high-current applications, and there is a need for a solution that provides accurate and responsive temperature information without increasing the relay's size.
Innovation Solution
Incorporating temperature sensing elements, such as resistance temperature detectors, thermistors, or thermocouples, within the relay housing in close proximity to the contacts, allowing for local or remote monitoring of temperature changes, and enabling wireless signal transmission for real-time feedback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If temperature sensing elements are added to the relay housing, then temperature monitoring capability is improved, but device complexity increases
Solution Approach 1:
The temperature sensing element is integrated into the existing relay housing structure, combining the temperature monitoring function with the relay's mechanical structure. This merging approach adds temperature sensing capability while minimizing the increase in overall device complexity by utilizing existing structural elements.
Solution Approach 2:
The relay housing is designed to serve multiple functions: it provides mechanical protection for the contacts and simultaneously serves as the mounting structure for the temperature sensing element. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in device complexity.
2Loss of time
If temperature sensing element is positioned close to contacts, then temperature measurement responsiveness is improved, but manufacturing precision requirements increase
Solution Approach 1:
The temperature sensing element is pre-positioned on the relay housing at a location that is inherently close to the contacts in the assembled state. This preliminary positioning during the housing fabrication process eliminates the need for precise post-assembly adjustments, thereby reducing manufacturing precision requirements while maintaining fast temperature detection response.
Solution Approach 2:
The relay housing acts as an intermediary structure that holds the temperature sensing element in the correct position relative to the contacts. By using the housing as the mounting platform, the design transfers the positioning function to a readily available structural element, reducing the precision demands on the sensing element's direct mounting to the contacts.
3Adaptability or versatility
If wireless signal transmission is added, then remote monitoring capability is improved, but energy consumption increases
Solution Approach 1:
The wireless temperature data transmission is implemented as a periodic function rather than continuous transmission. The relay transmits temperature data at predetermined time intervals or when temperature thresholds are exceeded, enabling remote monitoring capability while significantly reducing overall energy consumption compared to continuous transmission.
Solution Approach 2:
The wireless communication system is designed to transmit temperature data based on feedback from the temperature sensing element. The system monitors local temperature conditions and only activates wireless transmission when relevant temperature information needs to be communicated, optimizing energy usage while maintaining remote monitoring functionality.
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 solution provides accurate and timely temperature monitoring, enabling early detection of potential failures and facilitating preventative maintenance, ensuring safe operation and reducing the risk of system failures in high-current applications.
Implementation Method 1
A potential indicator of a pending failure of a relay may be a rise in the temperature of the contact, e.g., due to resistive heating as the contact degrades with use
Data Source
Figure 1A~1B
Figure 1C~1D
Figure 1E
AI summary
Electromechanical relay constructions (100) comprising an external housing (102), a pair of switchable electrical contacts (104, 106) disposed within the housing (102), an element for activating the pair of electrical contacts (104, 106), and a temperature sensing element (118) disposed within the housing (102) adjacent the electrical contacts (104, 106). The temperature sensing element (118) provides a signal for determining the temperature within the relay housing (102). The relay (100) may comprise two or more temperature sensing elements (222, 224) disposed within the housing (102) a desired distance from one another. The temperature sensing element (118) may be attached to a member or substrate (115) disposed within the housing (102), may be attached to an existing internal structure (164) of the housing (102), or may be attached to one of the contacts (104, 106). The temperature sensing element (118) may be selected from the group consisting of resistance temperature detectors, negative temperature coefficient thermistors, thermopile sensors, thermocouples, and combinations thereof.