Cam-Controlled Plunger Pump for Variable Hydraulic Pressure
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Solution Overview
Problem
Existing high-pressure hydraulic pumps are expensive, heavy, noisy, and cumbersome, and they cannot deliver hydraulic liquid at different pressures and flows, requiring manual adjustment and lacking demand-controlled delivery profiles.
Innovation Solution
A system comprising an electric motor, a pump, and a controller that can control the opening and closing of a valve in relation to the rotational position of a rotor and cam, using sensors to adjust pressure and flow, allowing for programmable delivery profiles and compatibility with existing tools and machines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If a two-stage positive displacement pump is used to deliver high pressure hydraulic liquid, then high pressure (500 bars, 50 MPa and upwards) can be achieved, but the pump becomes expensive, heavy, noisy, and cumbersome
Solution Approach 1:
The patent replaces the traditional two-stage mechanical positive displacement pump system with an electric motor-driven plunger pump system. The electric motor (100) directly drives a single plunger (230) through a cam mechanism (210, 220), eliminating the need for complex two-stage mechanical pumping mechanisms. This substitution reduces manufacturing complexity and cost while maintaining high pressure capability.
Solution Approach 2:
The patent changes the operating parameters by using a single-acting plunger pump with variable displacement control instead of a two-stage pump. By controlling the valve (250) timing and the plunger stroke through the cam profile, the system achieves high pressure (50 MPa+) with a simpler single-stage mechanism, reducing manufacturing complexity while maintaining pressure performance.
2Stress or pressure
If existing high-pressure pumps are used, then high pressure delivery is achieved, but the pumps can only deliver at one fixed specific flow and require manual adjustment for different pressures
Solution Approach 1:
The patent implements dynamic control of the plunger pump system through an controller (300) that adjusts the valve (250) timing based on rotational position of the rotor (110) or cam (210). This dynamic adjustment allows the system to deliver different pressures and flows automatically, eliminating the need for manual adjustment and enabling demand-controlled hydraulic power delivery.
Solution Approach 2:
The patent incorporates a pressure sensor (290) that provides feedback to the controller (300) about the actual pressure at the outlet (270). The controller uses this feedback to adjust the valve timing and plunger displacement, enabling automatic maintenance of desired pressure levels and facilitating versatile pressure and flow delivery without manual intervention.
3Adaptability or versatility
If a pump is designed to deliver different predetermined pressures and flows, then demand controlled hydraulic power is achieved, but the system complexity increases
Solution Approach 1:
The patent replaces complex mechanical pressure and flow control mechanisms with an electronically controlled system. The controller (300) uses electronic signals to adjust the valve (250) timing based on rotational position and pressure feedback, simplifying the mechanical structure while enabling versatile pressure and flow control through software programming rather than mechanical complexity.
Solution Approach 2:
The patent creates a universal control system that can deliver different predetermined pressures and flows using a single pump design. The controller (300) is programmed to accommodate multiple operating modes and pressure/flow combinations, making the system adaptable to different hydraulic tools and machines without requiring physical modifications or complex mechanical adjustments.
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 system provides a cost-effective, lightweight, and silent pump capable of delivering hydraulic liquid at different controllable pressures and flows, ensuring efficient operation and compatibility with existing systems.
Implementation Method 1
a pressure sensor 290 sensing pressure of the hydraulic liquid exiting the outlet 270
Implementation Method 2
an electric motor 100 comprising a rotor 110 and a stator 120
Implementation Method 3
a pump 200, the pump being a plunger-type pump and comprising a cam 210, a cam shaft 220, a plunger 230
Data Source
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AI summary
A system delivering hydraulic liquid for a hydraulic tool or machine at different controllable pressures and flows is disclosed. The system comprises an electric motor (100) comprising a rotor (110) and a stator (120); a pump (200), the pump being a plunger-type pump and comprising a cam (210), a cam shaft (220), a plunger (230), a plunger chamber (240), and a valve (250), the valve (250) opening or closing an inlet (260) for the hydraulic liquid to the plunger chamber (240), the plunger chamber (240) comprising an outlet (270), the plunger (230) engaging the cam (210), and the cam shaft (220) being connected to the rotor (110); a controller (300) configured to control the opening or closing of the valve (250) in relation to rotational position of the rotor (110) or cam (210) thereby controlling the volume and pressure of the hydraulic liquid to the outlet (270); and a pressure sensor (290) sensing pressure of the hydraulic liquid exiting the outlet (270). The controller (300) is further configured to open the valve (250) in relation to the rotational position of the cam (210) when the pressure sensor (290) senses a predetermined pressure of the hydraulic liquid thereby limiting the flow and pressure to the outlet (270).