Vacuum Cleaner Pump Using Fan Under-Pressure for Motor Cooling
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Solution Overview
Problem
Conventional vacuum cleaners face motor failure risks due to water and dirt contamination in the air flow, which is not effectively addressed by existing bypass motor designs that require additional cooling fans and increased space, leading to inefficiencies and potential dust emission issues.
Innovation Solution
A pump design that utilizes the under-pressure generated by the main fan to create a secondary cooling air flow, separating it from the main suction flow, allowing for efficient motor cooling without additional fans and maintaining a standard dry pump assembly with minor adaptations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a bypass motor with additional cooling fan is used to cool the motor part separately, then motor cooling reliability is improved, but device complexity and space requirements increase
Solution Approach 1:
The patent combines the cooling function with the existing main fan by directing part of the main air flow through the motor housing. Instead of adding a separate cooling fan, the design utilizes the main fan's air flow to pass through channels in the motor housing, thereby cooling the motor while using existing components.
Solution Approach 2:
The main air flow serves dual purposes: it cools the motor by passing through the motor housing channels and simultaneously provides suction for the vacuum cleaner. This multi-functional use of the main air flow eliminates the need for dedicated cooling systems.
2Reliability
If a bypass motor with additional cooling fan is used to cool the motor part separately, then motor cooling reliability is improved, but the axial length of the motor increases
Solution Approach 1:
The cooling function is merged into the existing motor structure by creating channels within the motor housing that guide the main air flow through the motor. This integration allows cooling without extending the axial length, as the cooling path is formed within the existing housing volume.
3Use of energy by moving object
If the main air flow is used to cool the motor, then cooling efficiency is improved, but motor contamination risk increases
Solution Approach 1:
The air flow path is segmented into different zones: clean air enters through the cooling air inlet, passes through the motor housing channels to cool the motor, and exits through the cooling air outlet. This segmentation prevents contaminated main air flow from directly contacting the motor while still providing effective cooling.
Solution Approach 2:
The motor housing channels act as an intermediary structure that guides clean cooling air through the motor. This intermediary path separates the cooling function from the contaminated main air flow, protecting the motor from dust and water while maintaining cooling efficiency.
4Object-generated harmful factors
If additional filters are added in the bypass circuit to prevent dust emission, then dust emission control is improved, but device complexity increases
Solution Approach 1:
The cooling air flow path is merged with the existing filtration system. Clean air for cooling is drawn from the same source as the main air flow and passes through the same filtration stages, utilizing existing filters rather than requiring additional filtration components.
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
This design effectively prevents motor contamination, reduces the need for additional filters, and enhances cooling efficiency while maintaining a compact pump size, suitable for both dry and wet vacuum cleaners by using ambient air for cooling, thus preventing motor overheating and improving overall performance.
Implementation Method 1
a fan outside the motor outer casing, driven by the motor part, having a main inlet and a main outlet, wherein the fan generates a main suction flow between the main inlet and the main outlet and creates a region of under pressure
Implementation Method 2
a fluid coupling between the cooling air outlet and the region of under pressure such that a secondary flow of air is sucked through the cooling air inlet resulting in a cooling of the motor
Data Source
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AI summary
A pump is for generating a suction for application to a vacuum cleaner dirty air inlet. There is a motor inside a motor outer casing and a fan outside the motor outer casing having a main inlet and a main outlet. The fan generates a main suction flow between the main inlet and the main outlet and creates a region of under pressure. This under pressure is used to drive a secondary flow between a cooling air inlet to the motor outer casing and a cooling air outlet from the motor outer casing. The secondary air flow is induced by making use of an under pressure generated by the fan.