Solenoid Pilot Spool Valve Internal Passage Design
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Solution Overview
Problem
Conventional solenoid-operated pilot type spool valves require complex internal structures due to the need for a pilot passage within the valve body, complicating design and fabrication.
Innovation Solution
A solenoid-operated pilot type spool valve design where the pilot passage is formed inside the spool, eliminating the need for a pilot passage within the valve body, featuring a spool with a constantly open communication passage between the spool and pilot piston, and a solenoid-operated pilot valve that controls this passage to switch flow paths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a pilot passage is formed inside the valve body to guide pilot air to piston boxes, then the spool valve can switch flow passages, but the internal structure of the valve body becomes complex
Solution Approach 1:
The pilot passage is extracted from the valve body and relocated to the spool. The spool now contains the pilot passage that guides pilot air to the piston boxes, while the valve body is relieved of this complex internal structure. This extraction resolves the contradiction by maintaining the flow passage switching capability while simplifying the valve body's internal structure.
Solution Approach 2:
The pilot passage is nested within the spool structure rather than being formed in the valve body. The spool acts as a container for the pilot passage, which in turn guides pilot air to the piston boxes. This nesting approach consolidates the pilot air guidance function within the spool, eliminating the need for complex internal passages in the valve body.
2Adaptability or versatility
If multiple ports and fitting holes are provided in the valve body, then the valve can perform multiple functions, but the design and fabrication become more difficult
Solution Approach 1:
The valve system is segmented into distinct functional components: the valve body handles main flow passages with ports, while the spool handles pilot air guidance with its own passage and piston boxes. This segmentation allows each component to be optimized independently, simplifying the design and fabrication of the valve body while maintaining multiple port functions.
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
Simplifies the internal structure of the valve body, facilitating design and fabrication by eliminating the need for a pilot passage within the valve body and allowing for efficient switching of flow passages.
Implementation Method 1
a pilot valve of a solenoid-operated type that opens and closes the opening/closing communication passage
Implementation Method 2
by supplying and discharging pilot air to and from the pilot piston with a large diameter by turning the pilot valve on and off while the pilot air is made to act on the pilot piston with a small diameter, the flow passages between a plurality of ports are switched by reciprocation of the spool using the difference in acting force according to the difference in pressure receiving areas between the two pilot pistons
Data Source
AI summary
A pilot passage that is in communication with an input port at all times is formed inside a spool, the pilot passage and a second pressure receiving chamber on one side of a pilot piston are made to be in communication with each other at all times through a constantly open communication passage formed in a continuous portion between the spool and the pilot piston, the second pressure receiving chamber and a first pressure receiving chamber on the other side of the pilot piston are made to be in communication with each other through an opening/closing communication passage that is formed in a piston box and that is opened and closed with a pilot valve, and the pilot piston is driven and the spool is switched by turning the pilot valve on and off to supply/discharge pilot air to/from the first pressure receiving chamber.