Pyrotechnic Switch Piston Projection for Reliable Contact Actuation
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Solution Overview
Problem
Existing electrical switching devices face reliability issues due to varying pressure relationships and material tolerances, which affect the consistent activation of pyrotechnic triggers and the positioning of contact elements.
Innovation Solution
The electrical switching device incorporates a piston arrangement with a lead that extends towards the pyrotechnic trigger, allowing for the direct absorption of a pressure impulse and transfer of this impulse to the contact element, ensuring a precise and reliable activation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If a pyrotechnic trigger is used to actuate the contact element via pressure chamber and piston assembly, then the switching device can achieve automated switching function, but the reliability is compromised due to varying pressure conditions and material tolerances after longer storage times
Solution Approach 1:
The projection is pre-positioned on the piston assembly to directly receive the pressure pulse from the pyrotechnic trigger. This preliminary positioning ensures that the pressure impulse is immediately captured and transmitted to the contact element without being lost to pressure chamber compliance or distributed across the entire piston surface, thereby maintaining reliable actuation even after storage
Solution Approach 2:
The projection acts as an intermediary element between the pyrotechnic trigger and the contact element. It specifically captures the pressure pulse from the trigger and transmits it directly to the contact element, serving as a dedicated force transmission path that overcomes the reliability issues caused by general pressure chamber-piston assembly interactions
2Speed
If the pressure impulse is directly transmitted from the pyrotechnic trigger to the piston surface, then the contact element can be actuated, but the system exhibits sluggish response and high resistance due to pressure distribution across the entire piston surface
Solution Approach 1:
The projection creates a localized force application point on the piston assembly, concentrating the pressure impulse from the pyrotechnic trigger onto a specific small area rather than distributing it across the entire piston surface. This local quality enhancement enables faster, more direct transmission of the actuating force to the contact element with reduced resistance
Solution Approach 2:
The piston assembly is segmented into two functional parts: the projection that receives and transmits the pressure pulse directly to the contact element, and the piston surface that provides structural support. This segmentation allows the pressure impulse to be efficiently transmitted through the projection while the piston surface maintains structural integrity
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 the reliability of the switching device by providing a more process-proof and direct transmission of pressure impulses, reducing resistance and enabling a smoother transition of the contact element to its active position.
Implementation Method 1
a pyrotechnic trigger (4) is accommodated in the pressure chamber (3)... upon activation of the pyrotechnic trigger (4), an (impulsive) pressure in the pressure chamber (3) acts on the piston surface (6)
Implementation Method 2
the projection (10) is provided for (directly) receiving a first pressure pulse at the active surface (11) upon activation of the pyrotechnic trigger (4), and for transmitting the first pressure pulse to the contact element (7)
Data Source
Figure 1~2
Figure 3
Figure 4a~4b
AI summary
The invention relates to an electrical switching device (1) comprising a housing (2) with a pressure chamber (3) in which a pyrotechnic trigger (4) is received, and a piston assembly (5) arranged opposite the pyrotechnic trigger (4). The pressure chamber (3) is bounded by a piston surface (6) of the piston assembly in the housing (2), wherein, by means of activation of the pyrotechnic trigger, a pressure (P) acts on the piston surface (6), so that the piston assembly (5) is moved. Furthermore, the electrical switching device (1) comprises a contact element (7) which is mounted in the housing (2) in a ready position (8) and which, upon activation of the pyrotechnic trigger (4), can be moved together with the piston assembly (5) from the ready position (8) to an operating position (9).The piston arrangement (5) has at least one projection (10) extending from the piston surface (6) in the direction of the pyrotechnic trigger (4) and having an effective surface (11) facing the trigger, wherein the projection (10) is provided for receiving a first pressure pulse (I) at the effective surface (11) and for transmitting the first pressure pulse (I) to the contact element (7).