Semi-Closed Hydraulic Circuit for Flexible Pump Specification
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Solution Overview
Problem
Existing power transfer methods in hydroseeders and barkblowers are large and bulky, and charge pumps are not easily specifiable, leading to inefficiencies and limited variability in mechanical circuits.
Innovation Solution
A semi-closed loop hydraulic system is introduced, comprising a prime mover, a first hydraulic circuit, and a second hydraulic circuit that is fluidly coupled to the first, allowing for independent specification of hydraulic pumps and enabling efficient power transfer with reduced waste and greater variability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a closed-loop hydraulic system with integral charge pump is used, then power transfer efficiency is improved, but device complexity increases and adaptability decreases
Solution Approach 1:
The hydraulic system is divided into two independent circuits: a first closed-loop hydraulic circuit for power transfer and a second open-loop hydraulic circuit for charge pumping. This segmentation allows each circuit to be independently specified and optimized, resolving the contradiction between efficiency and adaptability.
Solution Approach 2:
The second hydraulic circuit serves multiple functions: it provides charge pumping capability, supplies hydraulic fluid to the first circuit, and enables ancillary functions. This multi-functionality allows the system to maintain efficiency while improving adaptability and specification variability.
2Device complexity
If direct mechanical coupling is used between prime mover and material pump, then device complexity is reduced, but power transfer efficiency decreases and weight increases
Solution Approach 1:
The patent replaces direct mechanical coupling with a hydraulic power transfer system. The first closed-loop hydraulic circuit transmits power from the prime mover to the material pump through hydraulic fluid, eliminating the need for complex mechanical couplings while improving power transfer efficiency and reducing weight.
3Adaptability or versatility
If belt and sheave mechanical coupling is used, then adaptability is improved, but device complexity increases and power transfer efficiency decreases
Solution Approach 1:
The hydraulic system replaces belt and sheave mechanical couplings with fluid-based power transfer. The first closed-loop hydraulic circuit provides adaptability through variable displacement pumps and motors while maintaining simpler overall system architecture and improved power transfer efficiency.
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 semi-closed loop hydraulic system enhances power transfer efficiency, allows for independent specification of hydraulic pumps, and reduces weight and cost by using flexible connections and low-pressure filters, while enabling ancillary functions typically reserved for closed-loop systems.
Implementation Method 1
a first hydraulic pump delivers hydraulic fluid to a driven actuator
Implementation Method 2
a second hydraulic pump delivers hydraulic fluid from the reservoir to the first hydraulic pump inlet
Data Source
AI summary
A semi-closed loop hydraulic circuit includes a prime move, a first hydraulic circuit operatively coupled to the prime mover, and a second hydraulic circuit operatively coupled to the prime mover. The second hydraulic circuit is fluidly coupled to the first hydraulic circuit.