Hand Blender Rib Design to Reduce Suction Force and Container Lifting
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Solution Overview
Problem
Hand blenders face challenges in user safety due to strong suction forces when used in liquids, which can lead to lifting of containers and are not user-friendly for home users due to difficulties in blade replacement and operation, especially with sharp mincing blades.
Innovation Solution
A hand blender design featuring a rib to create underpressure behind the opening, a tilt switch to prevent motor rotation when tilted beyond a certain angle, a detachable foot with a circumferential wall and cutter guard to manage suction and facilitate material flow, and a blade assembly with wider openings to enhance chopping efficiency and safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If small openings are provided in the foot to achieve good chopping standards and maximize chopping zones, then chopping performance is improved, but suction force increases causing the blender to lift containers
Solution Approach 1:
A rib structure is introduced as an intermediary element within the foot of the blender. The rib creates an underpressure zone behind the opening that acts as a mediator to reduce the overall suction force while still allowing material to be drawn into the chopping zone effectively. This intermediary structure modifies the pressure distribution to eliminate the harmful lifting effect.
2Productivity
If sharp mincing blades are used to achieve good chopping standards, then chopping efficiency is improved, but user safety deteriorates due to risk of cuts
Solution Approach 1:
The blade assembly is segmented into a removable blade component and a stationary mounting structure. The blade can be easily detached from the drive shaft by the user, allowing for simple replacement and cleaning. This segmentation maintains the sharpness and efficiency of the blade while eliminating the safety hazard of handling sharp blades, as users can quickly remove them when not in use.
3Productivity
If blades are coated with food during operation, then chopping performance is maintained, but ease of operation deteriorates due to difficulty in blade replacement
Solution Approach 1:
The blade assembly is segmented into a removable blade component and a stationary mounting structure. The blade can be easily detached from the drive shaft by the user, allowing for simple replacement and cleaning. This segmentation maintains the sharpness and efficiency of the blade while eliminating the safety hazard of handling sharp blades, as users can quickly remove them when not in use.
Solution Approach 2:
The blade replacement mechanism is designed to be user-serviceable without requiring special tools or complex procedures. The blade can be removed and reattached by the user themselves, enabling easy maintenance and cleaning between uses. This self-service capability ensures that users can maintain their own equipment without professional assistance.
4Productivity
If the blender is designed with powerful motor and minimal clearance for optimal chopping, then chopping efficiency is improved, but device complexity increases due to additional safety features
Solution Approach 1:
A tilt switch is incorporated that dynamically controls the motor based on the blender's orientation. When the blender is tilted beyond a predetermined angle, the switch automatically cuts power to the motor, preventing dangerous operation. This dynamic safety feature adds minimal complexity while providing effective protection against accidental injury from the powerful motor.
Solution Approach 2:
The tilt switch operates automatically based on the physical orientation of the device, requiring no user intervention or complex control systems. The safety mechanism serves itself by detecting the tilt condition and responding appropriately, adding minimal complexity to the overall system while providing robust safety protection.
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 design reduces suction force, enhances user safety by preventing accidental lifting, allows for easier blade maintenance, and improves chopping efficiency with wider openings for better ingredient flow and stirring performance.
Implementation Method 1
the rib is adapted to cause an underpressure in use in the area of the opening behind the rib
Implementation Method 2
the blender is provided with a switch, which switch is adapted to prevent the drive shaft from rotating when the blender is tilted by more than a pre-determined amount
Data Source
Figure 1
Figure 2~3
AI summary
A hand blender having a motor driven drive shaft, which drive shaft is adapted to rotate a blade. The blender is provided with a cutter guard 7 having a circumferential wall having an opening 10a-c. A rib 22 is provided on an inner surface of the circumferential wall adjacent to the opening to help direct contents to the blades and create an underpressure improving the efficiency of the device and preventing the cutter from sticking to a pan in use.