Compact Fluid-Driven Linear Actuator with Hydraulic Spool Valve Control
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Solution Overview
Problem
Existing linear actuators for air compressors are often large, heavy, and suffer from performance issues, requiring independent power sources and experiencing side loading on air and hydraulic pistons, which limits their efficiency and compactness.
Innovation Solution
A fluid-driven linear actuator design featuring a piston with a spool valve and switch valves that change configurations to create differential pressure, allowing for reciprocating motion and efficient fluid flow management, reducing the need for large piston sizes and independent power sources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If traditional linear actuators are used in air compressors, then the compressor can achieve basic compression function, but the actuator becomes large and heavy
Solution Approach 1:
The patent replaces traditional mechanical valve train systems with a hydraulic control system. The spool valve is actuated hydraulically through fluid pressure differentials created by the piston's reciprocating motion, eliminating the need for complex mechanical linkages, springs, and cam mechanisms that contribute to actuator weight and side loading problems.
Solution Approach 2:
The invention uses hydraulic fluid pressure to control the spool valve positions. The piston's motion creates pressure differentials in the hydraulic fluid that automatically shift the spool valve, which in turn controls fluid flow to the air piston. This hydraulic control mechanism reduces mechanical complexity and side loading while maintaining reliable operation.
2Use of energy by moving object
If traditional linear actuators are used in air compressors, then the compressor can achieve basic compression function, but the actuator requires independent power sources
Solution Approach 1:
The hydraulic control system is self-actuating through the piston's own reciprocating motion. As the piston moves back and forth, it automatically creates pressure differentials in the hydraulic fluid that shift the spool valve positions, controlling the fluid flow to the air piston. This eliminates the need for external power sources, solenoids, or electronic controls, simplifying the overall system.
Solution Approach 2:
The hydraulic fluid acts as an intermediary between the power piston and the air piston. The power piston's mechanical motion is converted into hydraulic pressure differentials, which then control the spool valve to regulate fluid flow to the air piston. This intermediary hydraulic system efficiently transmits and controls energy without requiring additional power sources.
3Length of moving object
If traditional linear actuators are used in air compressors, then the compressor can achieve basic compression function, but the piston size must be large
Solution Approach 1:
The compression process is divided into two stages using two separate air pistons. The first air piston performs initial compression, and the second air piston performs final compression. This segmentation allows each piston to be optimized for its specific compression stage, reducing the required stroke length and size of individual pistons while maintaining high overall compression efficiency.
Solution Approach 2:
The spool valve dynamically shifts positions in response to hydraulic pressure differentials created during each compression stroke. This dynamic valve control optimizes fluid flow timing and pressure distribution to both air pistons, enabling compact piston design while maintaining high compression productivity through precise control of the dual-stage compression process.
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 design enhances the compactness and efficiency of linear actuators by enabling smaller piston lengths, improved fluid flow management, and reduced side loading, leading to more effective and portable air compressors.
Implementation Method 1
the spool valve configured to be hydraulically moved within the valve chamber between a plurality of spool valve configurations, the plurality of spool valve configurations comprising a first spool valve configuration wherein the valve chamber is fluidly connected to the piston chamber to thereby create a first fluid pressure differential which tends to force the piston in a first axial direction
Implementation Method 2
create a first fluid pressure differential which tends to force the piston in a first axial direction in the piston chamber and a second spool valve configuration wherein the valve chamber is fluidly connected to the piston chamber to thereby create a second fluid pressure differential which tends to force the piston in a second axial direction
Implementation Method 3
at least one switch valve configured to be switchable between a plurality of switch valve configurations by the reciprocating motion of the piston and to thereby create one or more differential pressure configurations which hydraulically move the spool valve
Data Source
AI summary
A fluid-driven linear actuator comprises a piston configured for reciprocating motion in a piston chamber and a spool valve in a valve chamber. The valve chamber is fluidly connected to a fluid input and to a fluid output. The spool valve is configured to be hydraulically moved within the valve chamber between a plurality of spool valve configurations, comprising a first spool valve configuration wherein the valve chamber is fluidly connected to the piston chamber to thereby create a first fluid pressure differential which tends to force the piston in a first axial direction and a second spool valve configuration wherein the valve chamber is fluidly connected to the piston chamber to thereby create a second fluid pressure differential which tends to force the piston in a second axial direction. The actuator also comprises at least one switch valve configured to be switched between a plurality of switch valve configurations and to thereby create one or more differential pressure configurations which hydraulically move the spool valve.