Dual-Armature Relay Layout for Redundant Safety Switching
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Solution Overview
Problem
Existing relay apparatuses and safety switching devices lack reliability and are not compact or cost-effective, particularly when implementing multiple switching paths with single relays.
Innovation Solution
A dual armature relay design is employed, where the first relay has a number of positively driven normally closed contacts arranged in pairs, and both relays are activated with a time shift, ensuring redundancy and reliability while reducing space and cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple switching paths are implemented using separate relays, then reliability is improved, but device complexity and space requirements increase
Solution Approach 1:
The patent combines multiple relay functions into a single relay apparatus with multiple sets of contacts. Each set of contacts can be independently controlled to provide multiple switching paths, thereby maintaining reliability while reducing device complexity and space requirements compared to using separate relays for each switching path.
Solution Approach 2:
The relay apparatus is designed with universal functionality to perform multiple switching operations simultaneously. By incorporating multiple sets of contacts (first set, second set, third set) within a single relay device, it can handle multiple switching paths with different timing requirements, eliminating the need for multiple dedicated relays.
2Reliability
If multiple separate relays are used for switching paths, then reliability is improved, but cost and space consumption increase
Solution Approach 1:
The patent merges multiple relay functions into a single integrated relay apparatus. By housing multiple sets of contacts and control mechanisms within one device, it significantly reduces the space required compared to deploying multiple separate relays, while maintaining the reliability needed for safety-critical switching paths.
Solution Approach 2:
The relay apparatus employs a nested structure where multiple sets of contacts are arranged in a compact configuration within a single relay housing. This nesting approach allows multiple switching paths to be implemented in a space-efficient manner, reducing the overall footprint while preserving functional independence and reliability.
3Speed
If switching elements are activated simultaneously, then response time is improved, but safety and reliability deteriorate due to lack of time shift
Solution Approach 1:
The relay apparatus is configured to activate different sets of contacts in a predetermined sequence rather than simultaneously. The control unit is designed to trigger the first set of contacts, then after a defined time shift, activate the second and third sets. This preliminary sequencing ensures safety by preventing simultaneous activation, which could create hazardous conditions, while maintaining fast overall response time.
Solution Approach 2:
The switching operation employs periodic activation with defined time intervals between different contact sets. This periodic action with time shifts ensures that switching elements are not activated simultaneously, maintaining safety and reliability while achieving fast overall response through optimized timing sequences.
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 dual armature relay design enhances safety and reliability by providing redundant switching paths with reduced space and cost, allowing for efficient switch-on and switch-off delays with improved fault detection.
Implementation Method 1
a relay coil, which is electromagnetically coupled to the armature
Data Source
AI summary
A relay apparatus comprises input ports, output ports, and first and second relays. The first relay comprises: a first contact group comprising n≥2 first contacts arranged in parallel and moveable between open and closed positions by a first common armature; and a second contact group comprising n second contacts arranged in parallel and movable between open and closed positions by a second common armature, wherein the first and second contacts are arranged in series in pairs. The second relay includes m<n contacts arranged in parallel and moveable between open and closed positions by a third common armature. The first and second relays are arranged in series between the input and output ports such that the relay apparatus has plural parallel switching paths. A contact of the second relay is arranged in series with a first contact of the first contact group in m switching paths.