Solenoid Spool Valve With Unequal Lands And Integrated Sensor
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current solenoid spool valves require increased magnet size and higher pump capacity to handle higher pressures, leading to increased leakage and maintenance challenges due to equal area lands on the spool, necessitating a larger pump to compensate for leakage.
Innovation Solution
A solenoid spool valve with an integrated pressure sensor and controller that self-compensates for pressure changes, allowing for adaptive learning and independent force calculation on the spool, reducing the need for larger magnets and minimizing leakage by using a larger piston diameter for high flow without increasing the electromagnetic actuator size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If the spool diameter is increased to handle higher pressures, then the pressure capacity is improved, but the electromagnetic actuator size must be increased
Solution Approach 1:
The spool is divided into multiple lands with different surface areas. The first land has a larger surface area than the second land, allowing differential force application on the spool. This segmentation enables the system to achieve higher pressure capacity without proportionally increasing the electromagnetic actuator size, as the unequal lands create a mechanical advantage in force multiplication.
2Stress or pressure
If the pump capacity is increased to compensate for leakage, then the pressure stability is improved, but the device complexity increases
Solution Approach 1:
A sensor is integrated into the solenoid device to detect the actual pressure or position of the spool. This sensor feedback is fed to a controller that adjusts the electromagnetic actuator operation in real-time to compensate for leakage and maintain stable pressure. This closed-loop control eliminates the need for oversized pumps, maintaining pressure stability while avoiding the complexity of high-capacity pumping systems.
3Ease of manufacture
If equal area lands are used on the spool, then the manufacturing is simplified, but the pressure capacity is limited
Solution Approach 1:
Different lands on the spool are given different surface areas tailored to their specific functional requirements. The first land has a larger area optimized for high-pressure control, while the second land has a smaller area suited for its specific control function. This local differentiation of land areas enables the spool to achieve higher overall pressure capacity while remaining manufacturable, as each land's dimensions can be independently optimized.
4Measurement precision
If a sensor and controller are integrated into the solenoid device, then the measurement precision is improved, but the device complexity increases
Solution Approach 1:
The sensor and controller are integrated directly into the solenoid device housing, combining multiple functions (actuation, sensing, and control) into a single unified component. This merging eliminates the need for separate external sensors and control units, improving measurement precision by placing the sensor at the exact point of interest while managing complexity through integrated design rather than distributed components.
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 solution enables higher control pressures without increasing the electromagnetic actuator size, reduces leakage, and simplifies maintenance by integrating the pressure sensor and controller, allowing the solenoid spool valve to self-regulate and adapt to wear and changes, thus maintaining performance and efficiency.
Implementation Method 1
an electromagnetic actuator for providing an axial drive force to said spool in a first axial direction
Implementation Method 2
a sensor arranged to sense a control value of the solenoid device
Data Source
AI summary
A solenoid device including pressure altering means for altering an output pressure of the solenoid device; and an actuator for providing an actuating signal to said pressure altering means; wherein the solenoid device further includes a sensor arranged to sense a control value of the solenoid device, and a controller which receives a request and is arranged to control delivery of power to the actuator with feedback from the sensor until the control value meets the request.