Inlet Blocking Valve for Leak-Safe Cyclonic Surface Cleaners
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Solution Overview
Problem
Existing surface cleaning apparatuses, particularly handheld devices, face issues with dirt leakage when the suction source is turned off, as gravity causes dirt to fall out of the inlet passage, and there is a need for improved airflow management to enhance cyclonic separation efficiency.
Innovation Solution
A surface cleaning apparatus featuring a moveable blocking member positioned in the inlet passage, which is resiliently biased to block airflow when suction is off and automatically moves to an unblocking position under suction, combined with a receiving formation and ramp structure to direct air circumferentially around a cyclonic separation device, preventing dirt leakage and optimizing airflow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a moveable blocking member is added to prevent dirt leakage, then dirt containment is improved, but device complexity increases
Solution Approach 1:
The blocking member is designed to automatically move between blocking and unblocking positions based on suction activation, without requiring user intervention. The system self-regulates by using the suction force itself to trigger the blocking member's movement, eliminating the need for separate control mechanisms and reducing overall system complexity.
Solution Approach 2:
The blocking member responds to suction activation by detecting the presence or absence of suction force and automatically adjusting its position accordingly. This feedback mechanism ensures the blocking member is in the correct position (unblocking during suction, blocking when idle) without requiring external control systems.
2Ease of operation
If the blocking member automatically moves under suction, then ease of operation is improved, but the mechanism becomes more complex
Solution Approach 1:
The blocking member uses the suction force directly to move itself into the unblocking position, and relies on its own resilient bias to return to the blocking position when suction stops. This self-actuating mechanism eliminates the need for motors, solenoids, or other complex actuation systems.
Solution Approach 2:
The blocking member transitions from a static component to a dynamic one that automatically adjusts its position based on operational conditions. The resilient bias allows the member to flex and move as needed, providing automatic adaptation to suction activation without complex control mechanisms.
3Productivity
If the ramp formation directs air circumferentially, then cyclonic separation efficiency is improved, but device complexity increases
Solution Approach 1:
The ramp formation uses curved surfaces to direct air flow circumferentially around the cyclonic separation device. This curved geometry naturally guides the airflow in the desired circular path, creating the cyclonic effect without requiring additional moving parts or complex mechanical structures.
Solution Approach 2:
The ramp formation utilizes fluid dynamics principles to redirect airflow into a circumferential pattern. By strategically shaping the air passage, the design harnesses the natural behavior of moving air to create rotational flow, achieving efficient cyclonic separation through pneumatic design rather than mechanical means.
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 solution effectively prevents dirt leakage and enhances cyclonic separation by ensuring the blocking member is always in a position to block dirt when suction is off and directs airflow efficiently into the cyclonic separation device, improving cleaning performance and user convenience.
Implementation Method 1
a cyclonic separation device for separating dirt from the airflow passing through the apparatus (10), which device communicates with the passage (99) and with the dirt collection container (18)
Implementation Method 2
said ramp (135) directing incoming dirt-laden air such that it travels circumferentially around an inner surface (18d) of the cyclonic separation device
Implementation Method 3
a moveable blocking member positioned in the passage; wherein the blocking member is moveable between a blocking position, in which the passage is blocked or substantially blocked, and an unblocking position, in which air can pass through the passage
Data Source
Figure 1
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AI summary
A surface cleaning apparatus (10) is described including: a dirt collection container (18b); an inlet passage (99) leading to the dirt collection container (18b) through which dirt-laden air is drawn by a source of suction; and a moveable blocking member (120) positioned in the passage (99); wherein the blocking member (120) is moveable between a blocking position, in which the passage (99) is blocked or substantially blocked, and an unblocking position, in which air can pass through the passage (99), wherein the apparatus includes a receiving formation (130) for receiving at least a portion of the moveable blocking member (120) when the blocking member is in its unblocking position.