Suction device for a home vacuum cleaner
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Solution Overview
Problem
The heavy weight of the suction motor in domestic vacuum cleaners causes axial asymmetry and increased noise due to compression and stretching of damping elements, leading to inefficient decoupling of the vacuum motor from the housing.
Innovation Solution
A suction device with a suspension system featuring S-shaped damping elements and a compensating spring to maintain optimal decoupling and reduce vibration transfer, while keeping manufacturing costs low.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If heavy suction motor is used to generate sufficient suction flow, then suction power is improved, but noise increases and decoupling performance deteriorates due to compression and stretching of damping elements
Solution Approach 1:
The patent introduces a compensating spring that acts as a counterweight system to balance the heavy suction motor. The spring is positioned to oppose the gravitational force on the motor, creating a balanced suspension system that reduces the net load on damping elements and minimizes vibration transfer to the housing, thereby reducing noise while maintaining the motor's suction power capability
2Power
If heavy suction motor is used to generate sufficient suction flow, then suction power is improved, but decoupling performance deteriorates due to axial asymmetry of stresses
Solution Approach 1:
The compensating spring creates a counterbalancing force that offsets the asymmetric gravitational stress on the motor. This balancing action distributes the load more evenly across the suspension system, preventing axial asymmetry in the damping elements and maintaining effective decoupling performance while preserving the motor's power output
3Reliability
If flexible damping elements are used to reduce vibration transfer, then decoupling performance is improved, but load-bearing capacity decreases under heavy motor weight
Solution Approach 1:
The compensating spring serves as a load-bearing element that bears the heavy motor weight through its elastic properties. This allows the damping elements to remain flexible and focused on vibration isolation, while the spring handles the gravitational load, thereby maintaining both decoupling performance and load-bearing capacity simultaneously
4Reliability
If compensating spring is added to balance motor weight, then decoupling performance is improved, but device complexity increases
Solution Approach 1:
The compensating spring is designed to perform multiple functions simultaneously: it balances the motor weight, supports the motor structure, and contributes to the overall suspension and vibration isolation system. This multi-functionality reduces the need for separate dedicated components, thereby limiting the increase in device complexity while achieving improved decoupling performance
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 decouples the suction motor from the vacuum cleaner housing, reducing noise and maintaining flexibility in damping elements, thus enhancing the overall performance and cost-effectiveness of the suction device.
Implementation Method 1
the suspension system comprises furthermore at least one compensating spring configured to compensate the weight of the vacuum motor
Implementation Method 2
each damping element having a generally S-shaped cross-section... use very flexible damping elements and therefore to limit the transfer of vibrations generated by the suction motor
Implementation Method 3
a suction motor disposed in the motor casing and configured to generate a suction flow
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
The suction device (12) includes a motor housing (13); a suction motor (15) disposed in the motor housing (13) and configured to generate a suction flow; an air sealing element (18) comprising a first annular sealing portion (19) configured to cooperate hermetically with the motor housing (13), and a second annular sealing portion (21) configured to cooperate hermetically with the suction motor (15); and a suspension system (43) configured to support the suction motor (15), the suspension system (43) comprising a plurality of damping elements (45) distributed around the suction motor (15) and at least one compensating spring configured to compensate for the weight of the suction motor (15), each damping element (45) having a generally S-shaped cross-section.