Pressure Compensator Valve With Orifice Feedback for Hoist Damping
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Solution Overview
Problem
Hydraulically operated hoisting devices with hoist damping require a pressure compensator that optimizes operating behavior, particularly in compact designs where space is limited, and efficiently manages accumulator pressure to prevent uncontrolled lifting or lowering.
Innovation Solution
A valve with a regulating piston and two orifices connecting the control port to a spring-loaded receiving space and a compensating chamber, amplifying spring pressure, and optionally controlled by a solenoid to integrate switching functions, allowing for compact and efficient pressure management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a pressure compensator is used to ensure accumulator pressure follows load pressure, then uncontrolled lifting or lowering is prevented, but pump output is continuously required consuming energy and reducing lifting speed
Solution Approach 1:
The valve transitions from a static continuously-open state to a dynamic state where the second orifice is selectively closed by the servo control device based on damping mode, allowing the system to adapt its energy consumption to operational requirements
Solution Approach 2:
The servo control device automatically manages the second orifice based on system state, eliminating the need for continuous pump output to maintain accumulator pressure when damping is deactivated
2Use of energy by moving object
If an additional switching valve is inserted to block the connection in deactivated damping mode, then energy consumption is reduced, but device complexity and installation space increase
Solution Approach 1:
The switching function previously requiring a separate valve is merged into the pressure compensator by integrating the servo control device that can close the second orifice, eliminating the need for an additional switching valve
Solution Approach 2:
The pressure compensator valve is enhanced to perform both pressure compensation and mode-dependent flow control functions through the integrated servo control device, making it a multi-functional component
3Volume of moving object
If a compact cartridge valve design is used, then installation space is reduced, but the spring size must be minimized requiring amplified regulating pressure
Solution Approach 1:
The servo control mechanism creates a feedback system where the small spring force is amplified through the control logic that responds to system pressure conditions, allowing compact design while maintaining adequate force
Solution Approach 2:
The system changes the effective spring force parameter dynamically through the servo control device that can close the second orifice, allowing a small physical spring to produce larger effective regulating forces 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
The valve ensures that accumulator pressure follows load pressure, preventing uncontrolled movements and reducing energy consumption by integrating switching functions, thus enhancing the operating efficiency and space utilization in hoisting devices.
Implementation Method 1
A regulating piston (68), against the action of an energy storage device, in particular in the form of a compression spring (70), brings the regulating piston into at least one position forming a fluid-conveying connection
Implementation Method 2
a first orifice (88) arranged in the regulating piston (68), which connects the control port (40) to a receiving space (62) for the energy storage device (70) in a fluid-conveying manner
Implementation Method 3
a second orifice (90) arranged in an intermediate part (72) inside the valve housing (54), by which orifices the receiving space (62) can be connected to a compensating chamber (92)
Implementation Method 4
the second orifice (90) can be closed by a servo-control device, which can be controlled by a solenoid (104). If a solenoid is used, the closing force of which is greater than the hydraulic force acting on the regulating piston (68), the servo oil is prevented from flowing when the solenoid is actuated
Data Source
AI summary
A valve, in particular for use as a pressure compensator or maintenance-type component (38) in hydraulically actuated hoisting devices (2), has a valve housing (54) with a control port (40), a fluid inlet (64) and a fluid outlet (66). A regulating piston (68) is longitudinally displaceably in the valve housing (54) and acts against an energy storage device (70) in the form of a compression spring, bringing the regulating piston (68) into positions forming a fluid-conveying connection between the fluid inlet (40) and the fluid outlet (66) or blocking this connection by a control pressure existing at the control port (40). A first orifice (88) in the regulating piston (68) connects the control port (40) to a receiving space (62) for the energy storage device (70) in a fluid-conveying manner. A second orifice (90) is in an intermediate part (72) in the valve housing (54). The receiving space (62) can be connected to a compensating chamber (92), which connected to the fluid outlet (66) in a fluid-conveying manner (98).