Surface cleaning apparatus
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Solution Overview
Problem
Existing portable surface cleaning devices lack an efficient mechanism for separating air from debris-containing fluid during the extraction process, leading to ineffective fluid recovery and potential re-deposition of debris on cleaned surfaces.
Innovation Solution
A portable surface cleaning apparatus with a fluid delivery system and a fluid recovery system that includes an air/liquid separator, a recovery tank, and a motor/fan assembly to generate airflow, effectively separating liquid from air and debris, and a pump-cooling air pathway to manage heat and enhance cleaning efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a portable surface cleaning apparatus uses a simple fluid recovery system without an air/liquid separator, then the device complexity is reduced, but the fluid recovery effectiveness deteriorates due to inability to separate air from debris-containing fluid
Solution Approach 1:
The fluid recovery system is segmented into distinct functional components: an air/liquid separator that divides the incoming fluid stream into air and debris-containing liquid phases, a recovery tank for storing the separated liquid, and a pump for circulating the fluid. This segmentation allows each component to perform its specific function efficiently, resolving the contradiction by improving recovery effectiveness through functional specialization while keeping the overall device complexity manageable through modular design.
Solution Approach 2:
The air/liquid separator acts as an intermediary component between the extraction nozzle and the recovery tank. It mediates the separation process by using gravity and flow dynamics to divide the mixed fluid stream into air (which is vented) and debris-containing liquid (which is directed to the recovery tank). This intermediary component enables effective fluid recovery without requiring complex filtration or separation mechanisms throughout the entire system.
2Productivity
If the pump assembly operates continuously without cooling, then the cleaning operation can be maintained, but the pump temperature increases leading to reduced reliability and potential failure
Solution Approach 1:
The cooling system is designed to operate continuously alongside the pump assembly, ensuring that cooling air is constantly supplied to the pump throughout the cleaning operation. This continuous cooling action maintains the pump temperature within acceptable limits, allowing the pump to operate continuously without thermal degradation, thus resolving the contradiction between maintaining continuous productivity and preserving reliability.
Solution Approach 2:
Cooling air acts as an intermediary substance that transfers heat away from the pump assembly. The cooling air pathway introduces ambient air to the pump area, where it absorbs heat from the pump components through convection and conduction. This intermediary cooling mechanism enables continuous operation while preventing thermal buildup that would compromise reliability.
3Productivity
If cleaning fluid is heated during operation, then cleaning performance is improved, but the fluid temperature increases which may cause evaporation and loss of cleaning fluid
Solution Approach 1:
The system utilizes parameter changes in the cooling air pathway to manage fluid temperature. By controlling the flow rate and temperature of cooling air supplied to the pump and surrounding areas, the system can regulate the thermal environment. This allows the cleaning fluid to be maintained at an optimal temperature range that improves cleaning performance while minimizing evaporation losses through proper thermal management.
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 apparatus ensures effective removal and storage of cleaning fluid and debris, maintaining cleanliness and preventing re-deposition, while also managing heat to maintain fluid temperature and improve cleaning performance.
Implementation Method 1
a source of suction in fluid communication with the conduit to draw the cleaning fluid from the surface to be cleaned and through the nozzle and the conduit to the recovery tank
Implementation Method 2
an air/liquid separator adapted for separating liquid from air and debris in the fluid recovery system
Implementation Method 3
a pump assembly in fluid communication with the supply tank
Implementation Method 4
a pump-cooling air pathway fluidly connected with the fluid recovery system and including an inlet defined by an inlet opening provided in the base housing
Data Source
AI summary
A portable surface cleaning apparatus for a floor surface includes a main housing assembly adapted to be hand carried by a user, the main housing assembly carrying a fluid delivery system adapted for storing cleaning fluid and delivering the cleaning fluid to the surface to be cleaned, and a fluid recovery system adapted for removing the cleaning fluid and debris from the surface to be cleaned and storing the cleaning fluid and debris that was recovered, the main housing assembly comprising a base housing, a supply tank received on the main housing assembly, a recovery tank received on the main housing assembly separately from the supply tank.