Displacement Pump with Constant Volume Pressure Chambers
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Solution Overview
Problem
Conventional displacement pumps, particularly hydraulic pumps, face challenges in operating efficiently with low energy consumption and require a mechanism to disconnect during vehicle engine operation without significant volume changes in pressure chambers, leading to inefficiencies and high maintenance costs.
Innovation Solution
The design incorporates a pot-shaped housing with a swivel-mounted rotor and blades that maintain a constant total volume in pressure chambers and a connection element during rotation, ensuring low-loss operation by maintaining fluid communication between chambers, with features like sealing portions, recesses, and balancing holes to optimize lubrication and sealing, allowing for efficient energy use and disconnection during engine operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional displacement pumps are used, then they can perform their intended function, but they consume high energy and cannot be disconnected during engine operation
Solution Approach 1:
The pump employs dynamic blade positioning where blades can be radially movable between engaged and disengaged positions. During normal operation, blades are engaged to maintain pressure differential and drive the pump. During disconnection, blades are radially retracted to eliminate pressure differential, allowing the pump to be disconnected from the engine while maintaining structural integrity and sealing.
Solution Approach 2:
The invention changes the operational parameters by allowing the total volume of pressure chambers to vary within a controlled tolerance range (+/-5%) during rotor rotation. This volume variation enables the pump to maintain fluid communication between chambers while allowing for disconnection during engine operation, resolving the contradiction between energy efficiency and operational reliability.
2Loss of energy
If pressure chambers are disconnected during operation, then energy efficiency improves, but volume changes occur leading to losses
Solution Approach 1:
The invention introduces a connection element as an intermediary structure that fluidly connects pressure chambers while allowing for controlled volume changes. This connection element acts as a mediator that maintains fluid communication between chambers during operation while permitting volume variation within tolerance ranges, preventing energy losses associated with complete disconnection.
Solution Approach 2:
Instead of completely disconnecting pressure chambers which would cause volume instability and energy losses, the invention applies partial action by allowing volume changes within a controlled tolerance range of +/â5%. This partial connection approach maintains sufficient fluid communication to prevent excessive volume changes while still enabling energy-efficient operation during disconnection phases.
3Reliability
If blade tips are tightly sealed to chamber portion, then sealing improves, but volume variation during rotation increases
Solution Approach 1:
The invention applies local quality by providing sealing only at specific locations where blade tips contact the chamber portion, rather than requiring continuous sealing throughout the entire rotor circumference. This localized sealing approach maintains effective sealing where needed while allowing volume variation in other regions during rotor rotation, balancing sealing effectiveness with volume stability.
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 achieves low-loss operation with minimal volume changes (+/-2.5% tolerance) during rotor rotation, ensuring efficient hydraulic oil flow and adequate lubrication, reducing energy consumption and maintenance costs while allowing for seamless disconnection during engine operation.
Implementation Method 1
both pressure chambers are communicating with one another via the connection element during operation of the displacement pump
Implementation Method 2
an inner peripheral wall which has a sealing portion for tightly adjoining the rotor
Implementation Method 3
a rotor that is swivel-mounted about a rotation axis inside the housing
Data Source
AI summary
A displacement pump with a pot-shaped housing, a rotor which is swivel-mounted about a rotation axis inside the housing, and two blades which are guided in a movable manner insider the rotor, wherein the pot-shaped housing includes an inner peripheral wall which has a sealing portion for tightly adjoining the rotor and a chamber portion for tightly adjoining the blade tips, as well as for dividing the internal space of the housing into chambers. The rotor has two blade receptacles for receiving and guiding the blades, wherein each internal radially extending blade tip restricts a pressure chamber in the respective blade receptacle. Both pressure chambers are fluid-connected to one another via a connection element, wherein the total volume of both pressure chambers and the connection element remains at the same level during a rotation of the rotor, at least while the blade tips are attached to the chamber portion.