Cleaner Brush Assembly With Variable Shutter for Carpet Suction
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Solution Overview
Problem
Conventional cleaners face challenges in varying suction force and reducing running resistance on different floor types, such as rugs and carpets, which affects cleaning performance and efficiency, especially in autonomous robot cleaners.
Innovation Solution
A cleaner with a brush assembly that includes a variable shutter mechanism, which adjusts the air flow path sectional area by rotating in response to floor contact, and a squeegee member that moves upward to reduce resistance on carpets, allowing for adaptive suction force and reduced running resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the spacing between the lower surface of the suction unit and the floor is reduced to increase suction force, then the air flow path sectional area is reduced and suction performance is improved, but relatively large foreign materials fail to pass through the suction unit, deteriorating cleaning performance
Solution Approach 1:
The shutter is configured to be movable between a first position (opening the air flow path) and a second position (reducing the air flow path sectional area). This dynamic adjustment allows the system to adapt to different floor types - on carpets the shutter moves to the second position to increase suction force, while on hard floors it moves to the first position to maintain larger opening for debris passage.
2Adaptability or versatility
If a squeegee is disposed at the rear of the brush rotating body to support foreign materials, then cleaning performance is improved, but running resistance increases significantly on carpeted floors
Solution Approach 1:
The squeegee is integrated with the movable shutter mechanism, so that the squeegee's position is dynamically adjusted along with the shutter. When the shutter moves to the second position on carpets, the squeegee is lifted or repositioned to reduce contact with the carpet surface, thereby minimizing running resistance while maintaining cleaning effectiveness.
3Power
If the shutter is fixed in a closed position to maintain small air flow path sectional area for high suction force, then suction performance on carpets is improved, but the cleaner cannot effectively clean hard floors where larger opening is needed
Solution Approach 1:
The shutter mechanism is designed to automatically detect and respond to different floor types through the pressing force mechanism. When the cleaner encounters a carpet, the increased resistance causes the shutter to move to the second position; when on hard floors, the shutter returns to the first position. This self-adjusting mechanism eliminates the need for manual intervention or complex sensors.
4Extent of automation
If the cleaner is designed for autonomous operation without user manipulation, then automation is improved, but the ability to adapt to different floor types becomes more difficult to achieve
Solution Approach 1:
The shutter mechanism utilizes the physical interaction between the cleaner and the floor surface itself to trigger automatic adjustment. The pressing force from the brush rotating body and squeegee on different floor types directly actuates the shutter movement, creating a passive feedback mechanism that enables autonomous adaptation without requiring sensors, controllers, or power consumption for detection.
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 cleaner effectively increases suction force on varying floor types without user intervention and reduces running resistance, optimizing cleaning performance on carpets and other surfaces.
Implementation Method 1
rotated by rolling friction with respect to the floor
Implementation Method 2
configured to close a part of the opening by being rotated by pressing force upon being brought into contact with the floor
Implementation Method 3
a fan is rotated by a driving motor to generate a suction flow so as to suck dust
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
A cleaner according to the present invention includes a cleaner main body, and a suction unit provided with a nozzle portion configured to suck air containing foreign substances on a floor into the cleaner main body, and a brush assembly detachably mounted on the nozzle portion, wherein the brush assembly includes a frame coupled to the nozzle portion and provided with an opening that is open toward the front and positioned adjacent to the floor, a brush rotation bar accommodated in the frame and having at least one end portion rotatably supported on the frame, and a variable shutter rotatably mounted on the frame, and configured to close a part of the opening by being rotated by pressing force upon being brought into contact with the floor, whereby air suction force can be varied to correspond to a state of the floor, thereby improving cleaning performance.