Temperature-Dependent Switching Mechanism With Segmented Contact Area
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Solution Overview
Problem
Existing temperature-dependent switches face challenges in simple and inexpensive assembly without impairing the mechanical function of the snap-action disk, due to high precision requirements and internal stresses caused by welding the contact part onto the snap-action disk.
Innovation Solution
The contact area is partially separated from the snap-action disk by a gap or cut, allowing the contact part to be welded without generating internal stresses that could affect the snap-action disk's functionality, and a connecting web is used to facilitate assembly and testing before installation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the contact part is welded onto the snap-action disk, then electrical connection is achieved, but internal stresses are generated that impair the mechanical function of the snap-action disk
Solution Approach 1:
The contact area is segmented from the snap-action disk by introducing a gap or cut, separating the welding zone from the mechanically critical regions. This allows the contact part to be welded to the contact area without generating internal stresses that would affect the snap-action disk's mechanical function.
Solution Approach 2:
The contact area serves as an intermediary element between the contact part and the snap-action disk. The contact part is welded to the contact area, which is then attached to the snap-action disk, isolating the welding process from the snap-action disk and preventing stress transfer.
2Manufacturing precision
If high precision manufacturing is used for the snap-action disk, then mechanical function is maintained, but production costs increase
Solution Approach 1:
By segmenting the contact area from the snap-action disk, the manufacturing precision requirements are localized. The snap-action disk itself does not require high precision welding zones, allowing for simpler and more cost-effective manufacturing processes while maintaining mechanical function.
3Device complexity
If the snap-action disk is used for both current conduction and switching action, then device complexity is reduced, but mechanical reliability decreases
Solution Approach 1:
The contact area is segmented as a separate functional zone on the snap-action disk, dedicated to electrical connection. This allows the snap-action disk to perform its mechanical switching function without being compromised by welding stresses, while still enabling current conduction through the contact area.
Solution Approach 2:
Different regions of the snap-action disk are assigned different functions with different quality requirements. The contact area is optimized for electrical connection (welding), while the remaining portions maintain the mechanical properties needed for reliable switching action.
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 approach reduces production costs, minimizes rejects, and ensures reliable assembly and operation of the temperature-dependent switching mechanism, allowing for easy testing and installation while maintaining low contact resistance and high production stability.
Implementation Method 1
a bimetal snap-action disc and a spring snap-action disc, wherein the movable contact part is held captive on a contact area of the spring snap-action disc
Implementation Method 2
a spring snap-action disc and a bimetal snap-action disc
Implementation Method 3
the movable contact part is held captive on a contact area of the spring snap-action disc
Data Source
AI summary
A temperature-dependent switching mechanism (25) for a temperature-dependent switch (10), which has a housing (11) which accommodates the switching mechanism (25) and comprises an upper part (14) with a first external connection (19) and a lower part (12) with a second external connection (23), wherein a first contact face (18) which is connected to the first external connection (19) is provided on an inner side (16) of the upper part (14), and a second contact face (22) which is connected to the second external connection (23) is provided on an inner side (21) of the lower part (12), comprises a snap-action disc (26, 31), on which a resting region (41) is provided, on which a moveable contact part (29) is held nondetachably, wherein the contact part (29) interacts with the first contact face (18) and the snap-action disc (26, 31) interacts with the second contact face (22), and wherein the snap-action disc (26, 31) lifts the moveable contact part (29) off from the first contact face (18) depending on the temperature of said snap-action disc. The resting region (41) is separated from the snap-action disc (26, 31) over part (44) of its circumferential region (43) by a gap (42), which is preferably greater than 180°.