Portable Pressure Washer Pump Assembly with Eccentric Plunger
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Solution Overview
Problem
Conventional portable pressure washers have limited practical use due to low water pressure and clumsy design, and existing check valve mechanisms are unreliable, leading to uncontrolled water flow and inefficiency.
Innovation Solution
A portable pressure washer apparatus with a pump assembly featuring angularly offset plunger mechanisms, check valves, and a rotatable shaft with an eccentric member, allowing for sequential movement of plungers and independent operation of check valves, enabling higher pressure output and reliable water control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a battery pack power source is used to enable portability, then the apparatus can be used in any location, but the water pressure output becomes relatively low
Solution Approach 1:
The pump is divided into multiple pump assemblies (first, second, and third pump assemblies) arranged radially around a central axis. Each assembly includes its own plunger mechanism, inlet check valve, and outlet check valve. This segmentation allows the system to maintain high pressure output while running on battery power by having multiple smaller pumping units working in parallel.
2Reliability
If a check valve with biasing means is used to prevent water passage, then water flow can be controlled, but the pressure level required to open the valve is too great for reliable repeated operation
Solution Approach 1:
The check valves are pre-positioned in a normally closed state by spring biasing means. The valve seats are preliminarily set to block water flow before operation begins. When the pump assemblies build up sufficient pressure, the valves automatically open to allow water passage, and close automatically when pressure equalizes, providing reliable repeated operation without requiring excessive pressure levels.
3Device complexity
If the check valve operation is coupled with the electrical switch, then both functions are controlled by one mechanism, but the switch must be relatively large and complex
Solution Approach 1:
The control functions are segmented into separate components: the electrical switch controls only the motor power, while the check valve operation is controlled independently by pressure differential and spring biasing. This segmentation allows the electrical switch to remain small and simple, located at the trigger, while the check valves are positioned within the pump assemblies themselves, eliminating the need for a large integrated control mechanism.
4Stress or pressure
If multiple pump assemblies are used to increase water pressure, then higher pressure output is achieved, but the device complexity increases
Solution Approach 1:
Multiple pump assemblies are merged into a single integrated pump housing, sharing common components such as the motor, drive shaft, and outlet passage. The first, second, and third pump assemblies are radially arranged around a central axis, with their plungers driven by a single rotating cam mechanism. This merging approach achieves high water pressure output through parallel pumping action while minimizing overall device complexity by consolidating shared components.
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 apparatus achieves a significantly higher water pressure output, up to 75 Bar, with improved reliability and user control, enabling broader applications and extended operation, while maintaining portability and safety standards.
Implementation Method 1
a rotatable shaft with an eccentric member, allowing for sequential movement of plungers
Implementation Method 2
check valves, and a rotatable shaft with an eccentric member, allowing for sequential movement of plungers and independent operation of check valves
Implementation Method 3
The apparatus achieves a significantly higher water pressure output, up to 75 Bar
Data Source
Figure 1
Figure 2a~2b
Figure 2c~2d
AI summary
The present invention relates to hand held apparatus which is for use in the provision of a supply of a liquid, such as water, which is emitted from the apparatus at a pressure which is greater than that at which it enters the apparatus and which apparatus is commonly referred to as a pressure washer. The invention is particularly, although not solely, related to the provision of the apparatus with a power supply which is mounted on the same and therefore renders the apparatus completely portable and the apparatus is provided with a pump, operating control means and features which allow a greater pressure of the liquid that is emitted to be achieved than is possible with conventional battery powered pressure water apparatus.