Centrifugal Pump Impeller with Projecting Blade Face for Vehicle Washer
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Solution Overview
Problem
Centrifugal pumps in vehicle washer devices face a drop in discharge pressure due to increased viscosity of ethanol-based cleaning liquids at low temperatures, particularly affecting the front windshield where higher pressure is needed to counteract wind resistance, and there is a risk of pipe connections failing due to high internal pressure.
Innovation Solution
An impeller design with a boss and blades that increase angular momentum at the inlet side, reducing load torque and maintaining rotation speed, and a centrifugal pump configuration that allows for high pressure discharge to the front windshield and low pressure to the rear windshield by switching the rotation direction of the impeller.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the same motor is used to squirt cleaning liquid to both front and rear windshields by switching rotation direction, then the device complexity is reduced, but the discharge pressure to the front windshield becomes insufficient when cleaning liquid viscosity increases at low temperatures
Solution Approach 1:
The pump chamber is divided into two separate discharge paths: a first discharge path for high-pressure delivery to the front windshield and a second discharge path for low-pressure delivery to the rear windshield. This segmentation allows each path to be optimized for its specific pressure requirements, resolving the contradiction between using a single motor and achieving different discharge pressures.
Solution Approach 2:
A switching mechanism is introduced that can dynamically redirect the discharge path based on the target windshield. By switching the rotation direction of the motor and activating the appropriate discharge path, the system adapts to different pressure requirements: high pressure for the front windshield when needed, and low pressure for the rear windshield, thus resolving the pressure insufficiency while maintaining motor simplicity.
2Stress or pressure
If high pressure is applied to squirt cleaning liquid to the front windshield to counteract wind resistance, then the cleaning liquid can reach the desired position, but pipe connection portions may come apart due to excessive internal pressure
Solution Approach 1:
The discharge system is segmented into two independent paths with different pressure characteristics. The first discharge path is designed for high-pressure operation to the front windshield, while the second discharge path operates at low pressure to the rear windshield. This segmentation allows the front windshield path to receive the necessary high pressure without subjecting the entire piping system to uniformly high pressure, thereby protecting pipe connections from excessive stress.
Solution Approach 2:
Different pressure levels are applied locally to different discharge paths based on their specific requirements. The front windshield discharge path receives high pressure locally where needed to overcome wind resistance, while the rear windshield discharge path receives low pressure. This localized pressure differentiation ensures reliable pipe connections system-wide while maintaining effective cleaning liquid delivery to the front windshield.
3Length of moving object
If the cleaning liquid pipe length to the rear windshield is increased to reach the rear windshield from the washer tank, then the rear windshield can be cleaned, but the internal pressure in the pipe increases and may cause connection portions to come apart
Solution Approach 1:
The discharge system is segmented into two independent paths: a first discharge path for high-pressure delivery to the front windshield and a second discharge path for low-pressure delivery to the rear windshield. This segmentation allows the second discharge path to accommodate longer pipe lengths to the rear windshield without experiencing excessive pressure buildup, as the low-pressure configuration inherently limits internal pressure even over longer distances, preventing connection failures.
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 impeller design suppresses the drop in discharge pressure and ensures effective liquid discharge at low temperatures, preventing pipe connections from failing and ensuring proper cleaning liquid distribution.
Implementation Method 1
Each of the blades comprises one side face that is a face on a first side in a rotation direction of the impeller and includes a projecting face that projects from a base end portion at a boss side of the one side face towards the first side in the rotation direction with respect to a line that connects the base end portion and a center of rotation of the blades
Implementation Method 2
an impeller for a centrifugal pump... plural blades that extend from the boss towards a radial direction outside of the boss, and that discharge liquid towards a leading end side thereof by rotating
Data Source
AI summary
An impeller for a centrifugal pump comprising a boss supported by a rotation shaft of a motor so as to be rotatable as a unit with the rotation shaft; and a plurality of blades that extend from the boss towards a radial direction outside of the boss, and that discharge liquid towards a leading end side thereof by rotating; wherein each blade comprises one side face that is a face on a first side in a rotation direction of the impeller and includes a projecting face that projects from a base end portion at a boss side of the one side face towards the first side in the rotation direction with respect to a line that connects the base end portion and a center of rotation of the blades.