Capacity Control Valve Cap Structure for Precise CS Passage Opening
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Solution Overview
Problem
The existing capacity control valve requires high suction pressure to open the CS communication passage due to a narrowed pressure receiving surface, and this design is susceptible to being influenced by the welding bead, which can affect precise seating of the cap on the valve seat.
Innovation Solution
The capacity control valve includes a recessed portion on the outer peripheral end portion of the cap to house the welding bead, ensuring a larger pressure receiving surface and preventing the welding bead from influencing the cap's seating on the valve seat.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the cap is welded to the bellows core, then the on-off valve element is sealed and structurally strengthened, but the welding bead protrudes and prevents precise seating of the cap on the valve seat
Solution Approach 1:
The recessed portion is formed inside the cap to house the welding bead, creating a nested structure where the welding bead is contained within the recessed space rather than protruding outward. This allows the cap to maintain structural strength from welding while achieving precise seating on the valve seat.
2Area of stationary object
If the pressure receiving surface is extended to the outer peripheral end portion of the cap, then the pressure receiving surface area is increased, but the welding bead influences the seating precision
Solution Approach 1:
The recessed portion houses the welding bead within the cap structure, allowing the pressure receiving surface to extend to the outer peripheral end portion without the welding bead interfering with seating precision. The nested recessed structure separates the welding zone from the seating interface.
Solution Approach 2:
The recessed portion is strategically positioned at the outer peripheral end portion of the cap, creating a localized feature that accommodates the welding bead only where needed, while the rest of the cap maintains its pressure receiving surface for precise seating.
3Manufacturing precision
If the recessed portion is formed in the cap, then the welding bead can be housed and seating precision improved, but the pressure receiving surface area is reduced
Solution Approach 1:
The recessed portion is formed only at the outer peripheral end portion of the cap, creating a localized accommodation for the welding bead. The majority of the cap's pressure receiving surface remains intact and functional, minimizing the impact on pressure receiving area while achieving precise seating.
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 design allows for precise seating of the cap on the valve seat without being influenced by the welding bead, while maintaining a large pressure receiving surface, thereby improving the valve's responsiveness and operational reliability.
Implementation Method 1
a valve element is moved in the axial direction by electromagnetic force generated in a solenoid
Implementation Method 2
by contracting the bellows core and separating the cap of the on-off valve element from the valve seat by receiving suction pressure Ps in the CS communication passage
Data Source
AI summary
A capacity control valve includes a main valve that opens and closes communication between a discharge port and a control port formed in a valve housing by movement of a rod driven by a solenoid, a CS communication passage providing communication between a control fluid supply chamber formed in the valve housing and a suction port, and an on-off valve formed by a communication passage forming member having an annular valve seat in an outer periphery of the CS communication passage and an on-off valve element biased in the valve closing direction with respect to the valve seat.