Piston Pump Profiled Front Face Reduces Dead Volume
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Solution Overview
Problem
Piston pumps face inefficiencies due to dead volume regions in the compression chamber that cannot be adequately compressed or displaced by the piston movement, affecting their overall efficiency, especially in designs with simultaneous inflow and outflow.
Innovation Solution
The piston is designed with a region that temporarily enters a channel between the compression chamber and the outlet valve during the pump cycle, allowing for effective compression and displacement of fluid, thereby reducing dead volume and enhancing efficiency. This region is optimized in geometry to match the channel, ensuring fluid flow aligns with piston movement and minimizing friction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of stationary object
If the piston has a standard geometry optimized for the compression chamber, then the effective cross section is high and wear is low, but the dead volume in the channel cannot be reduced
Solution Approach 1:
The piston is divided into two functional parts: the main piston body optimized for the compression chamber and a separate projection element optimized for the channel. This segmentation allows each part to be independently optimized for its specific function, reducing dead volume in the channel while maintaining optimal performance in the compression chamber.
Solution Approach 2:
The piston features a localized projection with specific geometry (cylindrical, conical, or cuboidal) that is tailored to match the channel's geometry. This local modification allows the piston to effectively reduce dead volume in the channel region without compromising the overall piston design optimized for the compression chamber.
2Productivity
If the outlet valve and inlet valve are arranged coaxially, then the device structure is compact, but a dead volume region forms in the channel between the compression chamber and outlet valve
Solution Approach 1:
The solution extends the piston's functional geometry into a new dimension by adding a projection that protrudes into the channel. This dimensional extension allows the piston to directly address and reduce the dead volume in the channel region, which would be difficult to eliminate through conventional axial valve arrangement alone.
3Quantity of substance
If the piston moves back to compress fluid, then fluid displacement occurs, but fluid in the channel dead volume cannot be adequately compressed
Solution Approach 1:
The projection on the piston performs preliminary compression action on the fluid in the channel during the piston's outward movement, before the main compression stroke begins. This preliminary action reduces the dead volume and pre-compresses the fluid, improving overall compression effectiveness.
Solution Approach 2:
The projection ensures continuous useful action by maintaining compression capability throughout the entire piston cycle. As the piston moves outward, the projection continuously reduces the channel volume and compresses the fluid, eliminating the dead zone where no compression occurs in conventional designs.
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 solution significantly reduces dead volume and increases the efficiency of the piston pump by ensuring fluid can be effectively compressed and displaced during the compression phase, leading to improved performance and extended component life through reduced wear.
Implementation Method 1
the piston, which is arranged and can be moved in a cylinder, is moved in the direction of an armature plate arranged on the rear side of the cylinder, e.g. by means of a magnetic field produced by a solenoid
Implementation Method 2
If the magnetic field is switched off, a spring, for example, which is arranged between the piston and the armature plate, pushes the piston back in the direction of the initial position
Data Source
AI summary
The invention relates to a piston pump, in particular for injection systems for motorized two-wheeled vehicles and/or for motorized three-wheeled vehicles, having a compression chamber, a piston, an inlet valve, and an outlet valve. A fluid can flow into the compression chamber via the inlet valve, and the fluid can flow out of the compression chamber via the outlet valve. A region in the form of a channel, which is arranged fluidically upstream of the outlet valve, in particular directly upstream of the outlet valve, has a cross-section which is reduced compared to a compression chamber region at a distance from the outlet valve. The invention is characterized in that a piston end face facing the channel has a region which can be immersed into the channel.