Variable Area Hydraulic Pump for Low-Speed Heavy-Load Stability
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Solution Overview
Problem
Traditional positive displacement pumps require high rotating speeds and are not suitable for reciprocating drives with low operating speeds, making them ineffective for heavy-load hydraulic applications where variable action area is necessary.
Innovation Solution
A reciprocating low-speed heavy-load hydraulic pump with variable action area, comprising multiple hydraulic cylinder units, moving members, and solenoid reversing valves, allows for adjustable equivalent action area by controlling the participation of hydraulic cylinder units, ensuring stable pressure output through varying combinations and configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If traditional positive displacement pump is used, then the pump can transfer energy to liquid periodically, but the pump requires high rotating speed and cannot operate at low speed with reciprocating drive
Solution Approach 1:
The invention transforms the traditional rotary motion into reciprocating linear motion through a connecting rod mechanism. The piston moves back and forth linearly within the cylinder, driven by the connecting rod that converts rotational motion from the motor into reciprocating motion. This dynamic motion transformation enables the pump to operate at low speeds with reciprocating drives while maintaining effective pumping action.
2Power
If the number of hydraulic cylinder units is reduced, then the equivalent action area decreases and power consumption reduces, but the pressure output becomes unstable
Solution Approach 1:
The invention dynamically adjusts the number of active hydraulic cylinder units based on system pressure requirements. The controller monitors system pressure and selectively activates or deactivates individual cylinder units through the solenoid valves. This dynamic configuration allows the system to reduce power consumption by using fewer cylinders when pressure demand is low, while maintaining stable pressure output by engaging more cylinders when needed.
Solution Approach 2:
The invention changes the operational parameters of the hydraulic system by varying the equivalent action area through selective engagement of cylinder units. The controller modifies the number of active cylinders, thereby changing the total piston area engaged in pumping. This parameter change enables adaptation to different pressure and flow requirements, optimizing both power consumption and pressure stability.
3Stress or pressure
If the equivalent action area is increased, then the pressure output increases, but the power consumption increases and conversion efficiency decreases
Solution Approach 1:
The invention optimizes energy efficiency by dynamically adjusting the equivalent action area to match actual system pressure requirements. Rather than operating all cylinder units at full capacity continuously, the controller selectively engages only the necessary number of units based on real-time pressure feedback. This parameter adjustment ensures that pressure output is maintained at required levels while minimizing power consumption and maximizing conversion 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 pump achieves high conversion efficiency, stable operation, and optimal power utilization by adapting output power and pressure to the system requirements, preventing over- or under-pressure issues, thus enhancing system stability and efficiency.
Implementation Method 1
The reversing valve (5) is in the form of a two-position two-way solenoid reversing valve (5′)
Implementation Method 2
the oil is sucked when the sealed volume increases, and the oil is pressurized when the sealed volume decreases
Data Source
AI summary
A reciprocating low-speed heavy-load hydraulic pump with a variable action area comprises a plurality of hydraulic cylinder units (3) and moving members (1, 2). Two ends of the hydraulic cylinder units (3) are separately connected with the moving members (1, 2) via mechanical structures. The moving members (1, 2) move relative to each other. The hydraulic cylinder unit (3) consists of a hydraulic cylinder (4), a reversing valve (5) and a one-way valve (6). The hydraulic cylinder (4), the reversing valve (5) and the one-way valve (6) are connected with each other via hydraulic pipelines. Based on different magnitudes of driving force, the hydraulic pump can proactively configure and form different combinations of hydraulic cylinder units, and further adjust the size of an equivalent action area. Therefore, even if the magnitude of the driving force changes, it can be ensured that the hydraulic pump consisting of hydraulic cylinder units outputs oil liquid with a relatively stable pressure for use by a subsequently connected system. The reciprocating low-speed heavy-load hydraulic pump with a variable action area is advantageous in high conversion efficiency, a simple system structure and good working stability.