Extraction interface for airtight connection of a first flow channel to a second flow channel, base station having an extraction interface and system comprising a suction cleaner and a base station
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Solution Overview
Problem
Suction interfaces in vacuum cleaning devices experience a collapse of the sealing element due to negative pressure, leading to a loss of sealing effectiveness when connecting flow channels.
Innovation Solution
The sealing element is designed as an elastic bellows with an E-shape cross-section, featuring a bending point and leg end regions that stretch under negative pressure, maintaining contact with the flow channel and preventing collapse.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a sealing element is used to seal the suction opening, then sealing effectiveness is improved, but the sealing element collapses under negative pressure and is pulled into the flow channel, worsening sealing effectiveness
Solution Approach 1:
The sealing element is designed as an elastic bellows structure with an E-shaped cross-section that can flex and deform elastically under negative pressure without collapsing. The bellows structure with multiple expansion and contraction sections allows the sealing element to maintain its sealing function while accommodating pressure changes, preventing it from being pulled into the flow channel.
Solution Approach 2:
The sealing element's physical parameters are optimized by designing it with an E-shaped cross-section and specific elastic properties. The structure includes multiple expansion sections that can change volume and shape in response to pressure changes, allowing the sealing element to adapt its form while maintaining sealing effectiveness under varying pressure conditions.
2Reliability
If the sealing element is made elastic to prevent collapse, then sealing reliability under negative pressure is improved, but device complexity increases due to the bellows structure
Solution Approach 1:
The sealing element is segmented into multiple functional sections including a first expansion section, a second expansion section, and connecting sections with different rigidity characteristics. This segmentation allows each section to perform its specific function independently, managing complexity through functional decomposition while achieving reliable sealing under negative pressure.
Solution Approach 2:
The sealing element incorporates dynamic characteristics through its elastic bellows structure that can expand and contract in response to pressure changes. The structure transitions from a static sealing component to a dynamic one that adapts its shape and volume, allowing the softer connecting sections to deform preferentially and maintain sealing effectiveness under varying operating conditions.
3Reliability
If the bending point of the sealing element is constricted to form an E-shape, then the sealing element can stretch under negative pressure to maintain sealing, but manufacturing precision requirements increase
Solution Approach 1:
The sealing element utilizes material parameter changes by employing elastomeric materials with specific hardness ranges (30-60 Shore A). This material selection provides the necessary elasticity and flexibility to achieve the E-shaped cross-section and bending point constriction while accommodating normal manufacturing tolerances. The material's inherent elastic properties compensate for minor dimensional variations, reducing the stringency of manufacturing precision requirements.
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 elastic bellows design ensures an optimal sealing effect even under negative pressure, compensating for height tolerances and preventing the sealing element from entering the suction opening, thus maintaining airtight connectivity between flow channels.
Implementation Method 1
The sealing element is designed as an elastic bellows which, viewed in a cross-section oriented orthogonally to the opening plane, has an E-shape in a relaxed state of the sealing element
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
The invention relates to a suction interface (1) for an airtight connection of a first flow channel (2) with a second flow channel (3), wherein the suction interface (1) has a base body (4) with a suction opening (5), wherein the suction opening (5) has an opening plane (6) and a sealing element (7) surrounding the suction opening (5) in the circumferential direction.To improve the sealing effect of the sealing element (7), it is proposed that the sealing element (7) be designed as an elastic bellows which, viewed in a cross-section oriented orthogonally to the opening plane (6) in a relaxed state of the sealing element (7), has an E-shape with at least one bend (8), two legs (9, 10) meeting at the bend (8) and two leg end regions (11, 12) adjoining the legs (9, 10), wherein the leg end regions (11, 12) point radially outwards in a direction away from the suction opening (5) and are connected to two locally separated connection points (13, 14) of the base body (4).