Solenoid Valve Spool Reciprocation for Hydraulic Anti-Clogging
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Solution Overview
Problem
The solenoid valve in hydraulic drive systems is prone to malfunctions due to clogging from contaminants like dust and fiber dust, which can cause sticking or closing failures, and existing measures such as multiple filters may not be effective in preventing these issues.
Innovation Solution
A hydraulic system that includes a solenoid valve with a control device capable of intentionally reciprocating the valve spool from full open or full closed positions to remove contaminants caught between the spool and housing, using specific operation commands and conditions to clean the valve and reduce operational malfunctions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple filters are provided in the oil passage to catch contaminants, then the protection against clogging is improved, but the device complexity increases and the effectiveness is insufficient
Solution Approach 1:
The solenoid valve performs self-cleaning by reciprocating its own valve spool using its built-in solenoid and oil pressure mechanism. The control unit activates the solenoid to move the spool back and forth, clearing contaminants from the gap between the spool and housing without requiring external cleaning devices or multiple filters.
Solution Approach 2:
The solenoid valve executes periodic reciprocating movements of the valve spool at predetermined intervals. The control unit determines timing based on operating conditions (such as valve opening/closing frequency), activating the solenoid for brief periods to reciprocate the spool and clear contaminants, then returns to normal operation.
2Speed
If the solenoid thrust is increased to move the valve spool more reliably, then the responsiveness is improved, but the risk of malfunction due to clogging increases
Solution Approach 1:
The system periodically reciprocates the valve spool using the existing solenoid thrust to clear contaminants from the gap between the spool and housing. This periodic cleaning prevents contaminant accumulation that would otherwise require much higher continuous thrust to overcome, maintaining reliable spool movement with normal solenoid capability.
Solution Approach 2:
The reciprocating cleaning action removes contaminants in advance before they can accumulate to levels that would impede spool movement. By clearing the gap between the spool and housing proactively, the system prevents the need for excessive solenoid thrust that would be required to move a contaminated spool.
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 configuration effectively reduces the occurrence of contaminant-induced malfunctions in solenoid valves by actively removing contaminants and improving the lubricity and responsiveness of the spool, thereby enhancing the system's reliability and performance.
Implementation Method 1
the spool moves under thrust from a solenoid
Data Source
AI summary
A hydraulic system includes: a solenoid valve that includes a valve spool configured to slide within a housing, and moves the valve spool to a position corresponding to an operation command input to the solenoid valve; and a control device that outputs the operation command to the solenoid valve. When a predetermined condition is satisfied, the control device outputs a continuously or intermittently changing operation command to the solenoid valve to reciprocate the valve spool from a full open position or a full closed position.