Cleaner
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Solution Overview
Problem
Conventional cleaners face challenges in achieving high suction efficiency and compact design while minimizing noise and manufacturing costs, particularly in compact devices like handy and robot cleaners, due to pressure loss and flow loss issues between the impeller and diffuser.
Innovation Solution
The cleaner design incorporates an impeller with a hub and blades having a leading edge inclined 60-80 degrees to the axial direction, combined with a diffuser featuring an airfoil-shaped vane and specific casing arrangements to optimize airflow, along with a PMDC motor for efficient suction and reduced noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the distance between the impeller and diffuser is reduced to compensate for suction power loss, then the suction efficiency is improved, but noise increases due to pressure perturbation
Solution Approach 1:
The diffuser vane is designed with non-uniform thickness distribution along its length, with the thickness being greater at the root end and smaller at the tip end. This local variation in geometric properties optimizes the flow characteristics at different positions, reducing pressure perturbations and noise while maintaining suction efficiency.
Solution Approach 2:
The invention specifies optimal ranges for key geometric parameters: the distance between impeller and diffuser (10-30mm), the diffuser vane angle (15-30 degrees), and the vane thickness ratio (0.5-1.5mm). By optimizing these parameters, the system achieves high suction efficiency while minimizing noise generation from pressure perturbations.
2Object-generated harmful factors
If the size of the impeller and motor is increased to avoid noise, then the noise is reduced, but the size of the cleaner increases
Solution Approach 1:
Instead of increasing component size to reduce noise, the invention optimizes geometric parameters: reducing the impeller-diffuser distance to 10-30mm, setting the diffuser vane angle to 15-30 degrees, and optimizing vane thickness. These parameter optimizations maintain compact dimensions while minimizing noise through improved flow characteristics.
Solution Approach 2:
The diffuser vane is designed with pre-calculated optimal geometry (specific angles and thickness distributions) that proactively reduces pressure perturbations before they can generate noise, eliminating the need for larger components to achieve noise reduction.
3Power
If conventional high-power suction motors are used in compact cleaners, then the suction power is sufficient, but the cleaner cannot be made compact
Solution Approach 1:
The invention optimizes the impeller-diffuser distance to a narrow range of 10-30mm and designs the diffuser vane with specific geometric parameters (angle of 15-30 degrees, optimized thickness distribution). These parameter optimizations maximize suction efficiency within a compact form factor, enabling high suction power in small cleaners without requiring conventional large motors.
Solution Approach 2:
The diffuser vane employs non-uniform thickness distribution (thicker at root, thinner at tip) to optimize local flow characteristics, maximizing suction efficiency within the constrained space of compact cleaners.
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 enhances suction efficiency, reduces noise, and allows for a compact cleaner structure while lowering manufacturing costs by optimizing the impeller and diffuser configuration and using a PMDC motor.
Implementation Method 1
an impeller configured to suction air by rotating about a shaft
Implementation Method 2
a diffuser configured to guide air discharged from the impeller
Data Source
AI summary
Disclosed herein is a cleaner having an improved structure configured to improve the cleaning performance. The cleaner comprises a suction unit provided inside a body. The suction unit includes an impeller configured to suction air by rotating about a shaft, and a diffuser configured to guide air discharged from the impeller. The impeller includes a hub, and a blade disposed on the hub, and provided with a leading edge disposed in an upstream side in a direction in which air introduced into the suction unit flows, and a trailing edge disposed in a downstream side in the direction in which the air introduced into the suction unit flows. The leading edge of the blade forms an inclination of 60 degrees or more and 80 degrees or less with respect to an axial direction.