Vacuum Cleaner Airflow Layout for Independent Motor Cooling
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Solution Overview
Problem
Vacuum cleaners face challenges in maintaining efficient internal cooling, especially when the air flow path is restricted, leading to increased motor and electrical component temperatures due to reduced cooling effects.
Innovation Solution
A motor, fan, and dirt separating means arrangement that includes a separate cooling path for the motor, which is independent of the cleaning path and continues to provide cooling even if the cleaning path is blocked, with a second fan augmenting air flow around the motor for enhanced cooling, and a pre-fan filter to prevent dirt from reaching the motor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the cleaning path and cooling path share the same air flow pathway, then the structure is simpler, but the motor cooling efficiency deteriorates when the cleaning path is blocked
Solution Approach 1:
The air flow path is segmented into two independent pathways: a cleaning path for processing dirty air through the cyclone separator and filters, and a separate cooling path that draws ambient air directly to cool the motor. This segmentation ensures that blockages in the cleaning path do not affect motor cooling, as the cooling path operates independently using ambient air from the environment.
Solution Approach 2:
The cooling path introduces ambient air as an intermediary cooling medium that bypasses the cleaning path entirely. This ambient air serves as a dedicated cooling source that is not affected by dirt accumulation or blockages in the cleaning path, ensuring continuous motor cooling regardless of cleaning path conditions.
2Device complexity
If a single air flow path is used for both cleaning and cooling, then the device complexity is reduced, but the motor temperature increases when air flow is restricted
Solution Approach 1:
The air flow system is divided into separate cleaning and cooling pathways, allowing the cooling path to maintain independent air flow that is not restricted by cleaning path blockages. This ensures continuous effective cooling of the motor even when the cleaning path experiences air flow restrictions.
Solution Approach 2:
The cooling path is designed to proactively draw ambient air to the motor before heat buildup becomes critical. By establishing a dedicated cooling air flow that operates independently, the system performs preliminary cooling action that prevents motor temperature increase even when cleaning path air flow is restricted.
3Productivity
If the cleaning path is blocked, then the vacuum cleaner cannot perform cleaning function, but the motor continues to operate at high temperature
Solution Approach 1:
The air flow system is segmented into independent cleaning and cooling paths, allowing the cooling function to continue operating even when the cleaning path is blocked. The cooling path draws ambient air directly to the motor, maintaining thermal management while the cleaning function is impaired by blockages.
Solution Approach 2:
Ambient air serves as an intermediary cooling medium that bypasses the cleaning path entirely. This allows the motor to continue cooling effectively even when the cleaning path is blocked, as the ambient air provides a dedicated cooling source independent of cleaning path conditions.
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 arrangement ensures consistent motor cooling, even when the cleaning path is obstructed, maintaining optimal performance and reducing the risk of overheating by increasing air flow through the cooling path when the fan encounters resistance.
Implementation Method 1
a cyclone separator through which the air flow from the dirty air inlet passes
Implementation Method 2
a pre-fan filter located across the grille of the collection chamber to remove any fine dust and dirt particles remaining in the air flow after passage through the bag filter
Implementation Method 3
The fan is often a centrifugal fan, although it can be an impeller or a propeller
Implementation Method 4
an electric motor and a fan connected to an output shaft of the motor
Data Source
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AI summary
A motor, fan and dirt separating means arrangement for a vacuum cleaner, the arrangement comprising: a motor (16) with a drive shaft (20); a fan (18) coupled to the motor for generating air flow; and a dirt separating means (8) located in a cleaning path of the air flow, the cleaning path being between a dirty air inlet (126) and the fan, wherein the motor is located in a cooling path (31,61 a,59,61 b,32) of the air flow, the cooling path being between a clean air inlet (31) and the fan, wherein the air flow through the cleaning path is substantially greater than through the cooling path in normal operating conditions and wherein the cleaning path and the cooling path of the air flow combine substantially at the fan inlet. A vacuum cleaner comprising the motor, fan and dirt separating means arrangement.