Servo-Driven Gerotor Pump for High-Pressure Booster
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Solution Overview
Problem
High-pressure apparatuses face material damage due to pressure surges, mechanical stress, and inefficiencies in existing hydraulic drives, which fail to manage pressure effectively and reduce energy consumption.
Innovation Solution
A hydraulic drive system for high-pressure boosters using a constant displacement pump driven by a servomotor, with a closed control loop for precise pressure control, minimizing pulsation and energy use, and employing a gerotor pump for reduced volume flow pulsation and sound pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If piston pumps with quantity control are used, then pressure control and adjustability are improved, but device complexity and pulsation increase
Solution Approach 1:
The patent extracts the quantity control function from the pump itself and places it in the servo motor control system. Instead of modifying the pump's internal mechanics to provide variable displacement, the system uses a constant displacement pump controlled by a servo motor that adjusts speed and direction electronically, thereby simplifying the hydraulic drive while maintaining precise pressure control through electronic feedback.
Solution Approach 2:
The patent replaces the mechanical quantity control mechanisms (such as swashplate angle adjustment in axial piston pumps) with an electro-hydraulic control system. The servo motor provides electronic control of pump speed and direction, substituting complex mechanical adjustment mechanisms with simpler electronic control, reducing mechanical complexity while improving response time and control precision.
2Power
If piston pumps are used for high pressure, then power density is improved, but material stress and pressure surge damage increase
Solution Approach 1:
The patent implements dynamic control of the hydraulic drive system using a servo motor that can rapidly adjust speed and direction in response to feedback from pressure sensors and flow meters. This dynamic control allows the system to smoothly accelerate and decelerate the pump, avoiding sudden pressure surges while maintaining high power density. The continuous adjustment capability enables the system to operate at optimal power levels without generating damaging pressure peaks.
Solution Approach 2:
The patent incorporates feedback control through pressure sensors and flow meters that continuously monitor system conditions and feed information to the servo motor controller. This closed-loop feedback enables the system to detect and respond to pressure changes in real-time, preventing pressure surges before they reach damaging levels while maintaining efficient high-pressure operation. The feedback mechanism allows proactive adjustment rather than reactive response to pressure problems.
3Power
If conventional hydraulic drives are used, then pressure boosting is achieved, but energy efficiency and service life are reduced
Solution Approach 1:
The patent employs periodic reciprocating motion of the pump driven by the servo motor, which can be optimized to operate in smooth cycles rather than continuous high-speed operation. The servo motor controls the pump to accelerate and decelerate smoothly during each cycle, minimizing energy losses from sudden starts and stops. This periodic action with controlled acceleration profiles reduces energy waste while maintaining effective pressure boosting capability.
Solution Approach 2:
The patent changes the operating parameters of the hydraulic system by using a servo motor to vary pump speed and direction dynamically rather than operating at fixed parameters. The system adjusts flow rate, pressure, and direction based on actual demand, avoiding energy waste from maintaining constant high-pressure operation when lower pressures suffice. This parameter variability enables energy-efficient operation across different operating conditions while preserving full pressure boosting capability when needed.
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 solution reduces material overload, extends component lifespan, enhances energy efficiency, and minimizes power consumption, ensuring smooth operation and reduced wear on high-pressure components.
Implementation Method 1
pressure boosters as described above operate according to the principle of hydraulic pressure boosters
Implementation Method 2
these are self-adjusting gaps with hydrostatic/hydrodynamic stresses of axial piston machines
Implementation Method 3
a constant displacement pump, or a pump which conveys a constant volume per revolution, driven by a servomotor that together form a hydraulic drive. The servomotor can be electrically controlled, regulated and/or switched
Data Source
AI summary
Hydraulic drive and method for driving a pressure booster of a high-pressure apparatus. The hydraulic drive includes a pressure medium pump having one of a constant displacement pump and a pump conveying a constant volume per revolution, a servo motor coupled to drive the pump, and a controller structured to at least one of electrically control, regulate and switch the servo motor, which is arranged on at least one of a low pressure side and a high pressure side of the pressure booster.