Damper Spacer Element Prevents Sealing Leakage
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Solution Overview
Problem
Prior art dampers for movable furniture parts experience leaks in the fluid chamber due to the sealing element migrating axially and rotating with the drive part, leading to a pumping effect and fluid escape.
Innovation Solution
A spacer element is introduced between the sealing element and the drive part's projection to limit axial movement and prevent direct contact, ensuring the sealing element remains stationary and maintains the fluid chamber's integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the sealing element is arranged in a fixed manner on the damper housing and rests with a sealing lip on the rotating drive part, then the fluid chamber is sealed off, but the pumping effect caused by drive part movement results in sealing element migration and rotation, leading to fluid leakage
Solution Approach 1:
The patent introduces a spacer element as an intermediary component between the sealing element and the drive part. This spacer element prevents direct contact between the sealing element and the rotating drive part, eliminating the pumping effect that causes sealing element migration. The spacer element transfers the sealing function while isolating the sealing element from harmful rotational movements, thus maintaining sealing integrity without requiring the sealing element to withstand direct rotational contact.
Solution Approach 2:
The patent segments the sealing function by separating the sealing element from the drive part through the introduction of a spacer element. This segmentation allows the sealing element to remain stationary and fixed on the damper housing while the spacer element handles the interaction with the rotating drive part. By dividing the functional responsibilities, the system maintains reliable sealing while preventing the sealing element from migrating or rotating.
2Reliability
If the sealing element migrates axially outwards along the drive part, then the sealing element can no longer be held in position, but it begins to rotate with the drive part, causing a leak in the fluid chamber
Solution Approach 1:
The spacer element serves as a mediator that prevents the sealing element from migrating axially and rotating with the drive part. By positioning the spacer element between the sealing element and the drive part, it creates a mechanical barrier that maintains the sealing element's axial position and prevents it from being carried along by the rotating drive part, thus ensuring fluid chamber tightness and proper sealing element positioning.
3Reliability
If the sealing element bears against a collar or projection of the drive part, then the sealing element rotates with the drive part instead of being stuck in the damper housing, but this leads to a leak in the fluid chamber
Solution Approach 1:
The spacer element acts as an intermediary that prevents the sealing element from bearing against the collar or projection of the drive part. By introducing this intermediate component, the system eliminates the direct contact that would cause the sealing element to rotate with the drive part, thereby maintaining fluid chamber sealing integrity while simplifying the sealing element mounting arrangement.
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 spacer element effectively prevents fluid leakage by restricting the sealing element's movement and contact with the drive part, maintaining a tight fluid chamber and ensuring reliable damping performance.
Implementation Method 1
the movement of this drive part in the damping medium results in a pumping effect in the fluid chamber
Implementation Method 2
the sealing element bears against the drive part via a sealing lip that seals off the fluid chamber
Implementation Method 3
a damping piston (15) which is mounted in a linearly displaceable manner in the fluid chamber (14) and which surrounds a portion of the drive part (12)
Data Source
Figure 1
Figure 2a~2b
Figure 3a~3c
AI summary
Damper (10) for movable furniture parts (3), comprising a damper housing (11), a fluid chamber (14) formed in the damper housing (11), an elongated drive mechanism (12) which is movably, in particular rotatably, mounted in the damper housing (11) and extends in the axial direction (x), and a sealing element (30) arranged between the damper housing (11) and the drive mechanism (12). The damper is characterized by a spacer element (40) which delimits a movement of the sealing element (30) in the axial direction (x) and prevents direct contact between the sealing element (30) and the drive mechanism (12) in the axial direction (x).