Block Prevention Guard for Air Blower Clothing Suction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional portable power working machines, such as air blowing cleaners, suffer from clothing being sucked into the safety guard, leading to reduced air flow, increased vibration and noise, and decreased operability due to the suction force, which also affects the size and weight of the device.
Innovation Solution
A block prevention guard with a larger average opening area than the safety guard's lattice is positioned to prevent clothing from being sucked, ensuring a sufficient air intake area and reducing the protrusion from the fan case, while maintaining a required air blowing performance without increasing size or weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the height of the peripheral side portion of the safety guard is increased to prevent clothing suction, then the suction force influence is reduced, but the amount of lateral protrusion increases causing increases in size and weight
Solution Approach 1:
The invention introduces a block prevention guard positioned in front of the safety guard, creating a new spatial dimension for preventing clothing suction. Instead of increasing the height of the existing safety guard (which would increase protrusion), the block prevention guard is placed at a different position (in front of the safety guard) to intercept clothing before it reaches the suction zone, thereby solving the contradiction between prevention effectiveness and size/weight control
2Reliability
If the height of the peripheral side portion of the safety guard is increased to prevent clothing suction, then the suction force influence is reduced, but the amount of lateral protrusion increases causing deterioration of operability
Solution Approach 1:
The block prevention guard is positioned in front of the safety guard, utilizing a different spatial arrangement to prevent clothing suction. This dimensional change allows the machine to maintain compact proportions without excessive lateral protrusion, preserving ease of operation while effectively preventing clothing from being sucked into the air blower
3Device complexity
If the safety guard is positioned close to the suction port, then the structure is compact, but clothing is easily sucked to the safety guard blocking the air flow
Solution Approach 1:
The invention divides the protective function into two separate components: the safety guard (which maintains structural compactness by staying close to the suction port) and the block prevention guard (which prevents clothing suction). This segmentation allows the safety guard to remain in its original compact position while the additional block prevention guard intercepts clothing before it reaches the suction zone, thereby maintaining both compactness and air flow productivity
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 configuration effectively prevents clothing from being sucked, maintains air flow, reduces vibration and noise, and enhances operability by ensuring a sufficient air intake area and stable engine speed, while minimizing the device's size and weight.
Implementation Method 1
a centrifugal air blower 15 with a built-in fan is disposed on one side of a body portion 10
Data Source
Figure 1
Figure 2
Figure 3
AI summary
Provided is a portable power working machine in which suction of clothing to a safety guard can be reliably prevented and the amount of a portion protruding laterally from one side surface portion of a fan case can be reduced so as to enable a required air blowing performance to be obtained without causing an increase in size or weight or deterioration of the operability thereof. A suction port 25 for inhaling air is provided on one side surface portion of a fan case of an air blower, and a safety guard 30 is provided in the suction port. Further, the one side surface portion of the fan case has attached thereto a block prevention guard 40 that has a top surface portion with a top surface opening facing the suction port, three leg portions for allowing the top surface opening to face the suction port with a predetermined distance therebetween, and a lattice 43 provided in the top surface opening. Furthermore, the average opening area of apertures of the lattice in the top surface opening of the block prevention guard is larger than that of the apertures of the lattice of the safety guard.