Temperature-Dependent Switch Pressure Uptaking Structure
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Solution Overview
Problem
Existing temperature-dependent switches face challenges in maintaining stability under external pressure, leading to potential deformation and unreliable electrical contact, especially when used on appliances with windings or heat-contact surfaces, which increases production costs due to the need for more robust, expensive turned parts.
Innovation Solution
Incorporating a pressure-uptaking structure that protrudes outward from the upper and/or lower parts of the switch, directing external pressure into the wall regions without reinforcing the housing, allowing for the use of cost-effective deep-drawn parts while maintaining stability and thermal connection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the housing is made from robust turned parts to maintain stability under external pressure, then the mechanical strength and stability are improved, but the production cost increases
Solution Approach 1:
The housing is divided into two functional parts: deep-drawn parts for cost-effective production and a separate pressure-uptaking structure for mechanical strength. This segmentation allows each part to be optimized independently - the main housing can be produced cheaply by deep-drawing while the pressure-uptaking structure provides the necessary strength under external pressure without requiring the entire housing to be made from expensive turned parts.
Solution Approach 2:
The pressure-uptaking structure is integrated with the deep-drawn housing to form a composite structure that combines the cost advantages of deep-drawing with the mechanical advantages of a reinforced design. This merging allows the switch housing to achieve both low production cost and high mechanical strength under pressure.
2Stability of the object's composition
If the housing walls are reinforced to prevent deformation under pressure, then the stability is improved, but the thermal connection to the appliance deteriorates
Solution Approach 1:
Instead of uniformly reinforcing the entire housing which would impede thermal conduction, the reinforcement is localized to specific areas where pressure is applied. The pressure-uptaking structure is positioned to bear external loads while the main housing walls remain thin to ensure good thermal contact with the appliance, thus achieving both stability and thermal connection.
Solution Approach 2:
The pressure-uptaking structure acts as an intermediary element that absorbs and distributes external pressure away from the housing walls that are in contact with the appliance. This mediator prevents pressure-induced deformation of the thermal contact surfaces while maintaining the integrity of the housing under load.
3Manufacturing precision
If expensive turned parts are used instead of deep-drawn parts, then the manufacturing precision and stability are improved, but the productivity decreases
Solution Approach 1:
The housing design segments the functional requirements into two parts: the main housing body produced by high-productivity deep-drawing processes and a separate pressure-uptaking structure that provides the necessary mechanical precision and stability. This segmentation enables the majority of the housing to be manufactured efficiently while only the critical pressure-bearing elements require higher precision.
Solution Approach 2:
The design accepts that the deep-drawn housing walls are thinner and less robust than turned parts, but compensates by adding the dedicated pressure-uptaking structure. This approach uses cheaper, faster-to-produce deep-drawn parts for the main housing while concentrating the precision requirements on the smaller pressure-uptaking components.
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 enhances stability against pressure without compromising thermal connection, enabling the use of deep-drawn parts instead of more expensive turned parts, reducing production costs while ensuring reliable electrical contact and mechanical integrity.
Implementation Method 1
If the temperature of the bimetallic snap-action disc now increases as a result of a temperature increase in the appliance which is to be protected above the transition temperature, the bimetallic snap-action disc changes its configuration
Implementation Method 2
a spring snap-action disc which is fitted with a moving contact part and which presses the spring disc against a stationary contact
Implementation Method 3
the pressure-uptaking structure protruding outwards beyond at least one the first and second outer surfaces, such that pressure acting on the switch from the outside is conducted into wall-regions of the lower part and/or upper part
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A temperature-dependent switch comprises a housing (11) which has an upper part (14) with a first outer surface (16) and a lower part (12) with a second outer surface (15), and a temperature-dependent switching mechanism (19; 46) which is arranged in the housing (11) and, as a function of its temperature, establishes or opens an electrically conductive connection between two outer connections (17, 18). A pressure-uptaking structure (41, 42) is provided on the outside of the upper part (14) and/or the lower part (12), said pressure-uptaking structure protruding approximately perpendicularly outwards beyond the first and/or second outer surface (15, 16) (Fig. 1).