Valve Flap O-Ring Layout for Vacuum-Tight Fluid Switchover
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Solution Overview
Problem
Existing fluid changeover switches are either complex and expensive to produce or not pressure-tight enough, failing to meet the requirements for reliable operation, especially in applications involving negative pressure conditions like heat pumps.
Innovation Solution
A fluid changeover switch design featuring a housing with at least three connections, a rotatably mounted valve flap with a circumferential O-ring seal that deviates at two deflection sections on the same side of the axis of rotation, ensuring fluid-tight separation of flow paths and maintaining vacuum tightness, using conventional O-ring seals for simplicity and cost-effectiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional sealing solutions are used in fluid changeover switches, then manufacturing cost is reduced, but pressure-tightness and reliability deteriorate
Solution Approach 1:
The sealing function is segmented into multiple O-rings positioned at different locations (first O-ring at the first location, second O-ring at the second location) to seal against the axis of rotation. This segmentation allows each O-ring to handle specific sealing zones, maintaining pressure-tightness while using simple, conventional sealing components that are easy to manufacture and install.
Solution Approach 2:
O-rings are introduced as intermediary sealing elements between the axis of rotation and the housing bore. These O-rings mediate the sealing function by accommodating minor misalignments and wear while maintaining the vacuum seal, thus improving reliability without requiring precision manufacturing of the axis or housing.
2Reliability
If complex sealing mechanisms are used to ensure vacuum tightness, then pressure-tightness is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The sealing function is extracted from the axis of rotation itself and placed into separate, removable O-rings positioned in the housing bore. This extraction simplifies the overall design by making the sealing elements independent, replaceable components rather than integral parts of a complex sealing mechanism.
Solution Approach 2:
The O-rings are designed as simple, inexpensive, replaceable sealing elements rather than complex permanent seals. If wear or damage occurs, the O-rings can be easily replaced without replacing entire sealing assemblies, reducing both initial complexity and long-term maintenance complexity.
3Reliability
If multiple O-rings are used to seal the axis of rotation, then pressure-tightness is improved, but manufacturing complexity increases
Solution Approach 1:
The O-rings serve multiple functions: they seal against the axis of rotation at different locations, accommodate thermal expansion and wear, and can be installed as a complete sealing kit. This multi-functionality with simple components achieves reliable vacuum sealing without requiring complex assembly procedures.
Data Source
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AI summary
A fluid switchover device comprises the following features: a housing (10) having at least three connection points (11, 12, 13, 14), which lead into an interior; a valve flap (30) having a rotary shaft (40), the valve flap being rotatably arranged in the housing (10), and the rotary shaft (40) being attached to the housing at a first point (41) and at a second point (42); and a peripheral seal (50), which is attached to the valve flap (30) and which has a first avoiding portion (51) at the first point (41) and a second avoiding portion (52) at the second point (42), the first avoiding portion (51) and the second avoiding portion (52) being designed to avoid the rotary shaft (40) on the same side of the valve flap (30), and the valve flap being designed to slidingly delimit the interior by means of the peripheral seal (50) so that in a first position of the valve flap the first connection point (11) is connected to the second connection point (12) and the first connection point (11) is sealed off from the third connection point and in a second position of the valve flap the first connection point (11) is connected to the third connection point (13) and the first connection point (11) is sealed off from the second connection point (12).