Pump Control Device Spool Segmentation for Precision
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Solution Overview
Problem
Conventional pump control apparatuses become structurally complex as the number of signal pressures increases, requiring a larger spool and increased complexity to manage discharge capacity effectively.
Innovation Solution
A pump control apparatus with a regulator that includes a spool with a driving pressure receiving surface inside and a signal pressure receiving surface on its outer peripheral step portion, using the average discharge pressure and signal pressure to regulate control pressure, allowing for simple structure maintenance even with multiple signal pressures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple signal pressures are introduced to control discharge capacity, then control precision is improved, but spool size and device complexity increase
Solution Approach 1:
The spool is segmented into distinct functional zones: an inner portion with a driving pressure receiving surface and an outer peripheral step portion with a signal pressure receiving surface. This segmentation allows different pressures to act on separate areas, enabling precise control without requiring a larger overall spool size.
Solution Approach 2:
The patent utilizes the radial dimension of the spool by forming the signal pressure receiving surface on the outer peripheral step portion while the driving pressure receiving surface is on the inner portion. This dimensional arrangement allows multiple pressures to be received simultaneously without increasing the spool's axial or radial size.
2Measurement precision
If multiple signal pressures are introduced to control discharge capacity, then control precision is improved, but structural complexity increases
Solution Approach 1:
The spool structure is segmented into functional zones where the inner portion receives driving pressure and the outer peripheral step portion receives signal pressure. This segmentation enables multi-pressure control while maintaining a compact, integrated structure without additional complex components.
Solution Approach 2:
The spool serves multiple functions simultaneously: it acts as both a driving pressure receiving element and a signal pressure receiving element. This multi-functionality allows the single spool structure to handle multiple control pressures without requiring separate control mechanisms, thereby reducing structural complexity.
3Adaptability or versatility
If spool size is increased to accommodate multiple signal pressures, then control capability is improved, but manufacturing complexity increases
Solution Approach 1:
The spool is designed with segmented functional surfaces: the inner portion has a driving pressure receiving surface while the outer peripheral step portion has a signal pressure receiving surface. This segmentation allows the spool to accommodate multiple control pressures without increasing its overall size, making it easier to manufacture with standard machining processes.
Solution Approach 2:
The patent utilizes the existing geometric parameters of the spool (inner radius, outer radius, step height) to create distinct pressure receiving zones. By changing how these parameters are utilized rather than increasing them, the spool maintains its original size while gaining enhanced control capability, simplifying manufacturing.
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 apparatus effectively controls discharge capacity with a simple structure, preventing spool size increase and maintaining efficient operation across varying load conditions without complex structural modifications.
Implementation Method 1
a spool that regulates the control pressure using the high pressure side discharge pressure as a source pressure by moving upon reception of the average discharge pressure and the signal pressure
Implementation Method 2
a driving pressure receiving surface that receives the average discharge pressure is formed inside the spool, and a signal pressure receiving surface that receives the signal pressure is formed in an outer peripheral step portion of the spool
Data Source
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AI summary
A pump control apparatus includes an actuator that varies a discharge capacity of a pump, and a regulator that regulates a control pressure led to the actuator. The regulator includes: a driving pressure port to which an average discharge pressure is led; a source pressure port to which a high pressure side discharge pressure is led; a signal pressure port to which a signal pressure is led; and a spool that regulates the control pressure using the high pressure side discharge pressure as a source pressure by moving upon reception of the average discharge pressure and the signal pressure. A driving pressure receiving surface that receives the average discharge pressure is formed inside the spool, and a signal pressure receiving surface that receives the signal pressure is formed in an outer peripheral step portion of the spool.