Jet Pump Pressure Washer With Variable Flow Spray Gun
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Solution Overview
Problem
Existing water spraying devices, such as garden hose sprayers and pressure washers, often have limitations in flow rate and pressure, making them inadequate for a wide range of outdoor cleaning tasks, particularly in achieving both high pressure and high flow rates simultaneously.
Innovation Solution
A pressure washer system incorporating a jet pump with a variable effective flow area spray gun, allowing for high pressure and high flow operating modes by adjusting the back pressure at the jet pump, which enables the entrainment of secondary fluid to increase the fluid flow rate, thereby providing customizable cleaning capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If pressure washers use pumps to increase water pressure for heavy-duty cleaning, then water pressure is greatly increased, but flow rate decreases and spray intensity becomes too great for some applications
Solution Approach 1:
The spray gun outlet effective flow area is made variable to dynamically adjust between high pressure mode (smaller flow area) and high flow mode (larger flow area), allowing the system to adapt to different cleaning application requirements
Solution Approach 2:
The system changes the operating parameters by varying the back pressure at the jet pump through adjustable spray gun outlet flow area, enabling transition between different operational states (high pressure vs. high flow modes)
2Adaptability or versatility
If garden hose sprayers constrict flow path through nozzles to condition flow for various applications, then flow rate and water pressure are limited by the water source, making them insufficient for heavy-duty applications
Solution Approach 1:
The invention merges a jet pump with a pressure washer system, combining the flow multiplication capability of the jet pump with the pressure generation capability of the pressure washer pump, thereby achieving both high flow rate and high pressure simultaneously
Solution Approach 2:
The system uses hydraulic principles through the jet pump mechanism, where pressurized primary fluid creates a vacuum to entrain secondary fluid, multiplying the total flow while maintaining cleaning power
3Stress or pressure
If spray gun outlet effective flow area is decreased to create high back pressure for high pressure mode, then water pressure increases, but flow rate decreases
Solution Approach 1:
The jet pump acts as an intermediary device between the pressure washer pump and the spray gun, using entrainment of secondary fluid to compensate for flow loss and actually increase total flow while maintaining pressure
4Quantity of substance
If spray gun outlet effective flow area is increased to create low back pressure for high flow mode, then flow rate increases, but water pressure decreases
Solution Approach 1:
The pressure washer system is designed to perform multiple functions through a single adjustable spray gun, capable of both high pressure cleaning and high flow rinsing applications by varying the outlet effective flow area
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 system effectively enhances the cleaning performance by allowing users to switch between high pressure and high flow modes easily, improving the 'flushing' or 'rinsing' capability of pressure washers, particularly electric pressure washers, and accommodating various outdoor cleaning applications.
Implementation Method 1
the pressurized primary fluid flows through the jet pump and creates a vacuum that draws the secondary fluid into the mixing chamber
Implementation Method 2
the secondary fluid is entrained with the primary fluid, resulting in a combined fluid flow
Data Source
AI summary
A pressure washer includes a prime mover, a water pump, the water pump including a pump inlet for receiving fluid from a fluid source and a pump outlet for supplying a pressurized primary fluid, a jet pump including a primary fluid inlet fluidly coupled to the pump outlet, a secondary fluid inlet, and a fluid outlet, and a spray gun configured to be fluidly coupled to the fluid outlet of the jet pump, the spray gun including a spray gun outlet having a variable effective flow area. Wherein, in operation, in a high pressure operating mode, the pressurized primary fluid flows through the jet pump and exits through the fluid outlet of the jet pump, and in a high flow operating mode, the pressurized primary fluid flows through the jet pump and entrains a secondary fluid supplied through the secondary fluid inlet, resulting in a combined fluid flow.