Displacement control valve
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Solution Overview
Problem
During continuous driving of a variable displacement compressor, the auxiliary communicating passage connects control ports and suction ports, leading to increased refrigerant flow and reduced operational efficiency.
Innovation Solution
A displacement control valve with a sliding member that connects and disconnects the control port and suction port through an intermediate communicating passage, allowing quick pressure reduction at startup and preventing fluid flow during normal operation, enhancing operational efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If an auxiliary communicating passage connects control ports and suction ports to quickly reduce control chamber pressure at startup, then startup responsivity is improved, but refrigerant flow increases during continuous driving reducing operational efficiency
Solution Approach 1:
The patent makes the auxiliary communicating passage dynamic by introducing a sliding member that can open or close the passage based on operational conditions. During startup, the passage is open to quickly reduce control chamber pressure and improve responsivity. During continuous operation, the passage is closed to prevent unnecessary refrigerant flow and maintain operational efficiency. This transforms a static structure into a dynamic one that adapts to different operational phases.
Solution Approach 2:
The sliding member is positioned in advance to block the auxiliary communicating passage during normal operation, preventing refrigerant flow before it can occur. At startup, the sliding member is moved to open the passage proactively, enabling quick pressure reduction. This preliminary positioning and proactive opening/closing action resolves the contradiction by preparing the system in advance for different operational states.
2Productivity
If the main valve remains closed to reduce control chamber pressure and maximize swash plate inclination angle, then maximum capacity is achieved, but fluid flow from control port to suction port increases through the auxiliary communicating passage
Solution Approach 1:
The patent introduces a dynamic control mechanism (sliding member) that adjusts the state of the auxiliary communicating passage based on the main valve position and operational phase. When the main valve is closed during continuous operation, the sliding member closes the auxiliary passage to prevent harmful refrigerant flow. This dynamic adjustment allows the system to maintain maximum discharge rate while avoiding energy loss from unnecessary fluid flow.
Solution Approach 2:
The sliding member acts as an intermediary element between the main valve and the auxiliary communicating passage. It mediates the interaction by opening the auxiliary passage only when needed (during startup or when main valve is open) and closing it when the main valve is closed during continuous operation. This intermediary control prevents the harmful effect of refrigerant flow while maintaining the beneficial effect of quick startup response.
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 effectively reduces refrigerant flow from the control port to the suction port during continuous operation, improving the operational efficiency of the variable displacement compressor while maintaining efficient fluid discharge at startup.
Implementation Method 1
a main valve that opens and closes communication between the discharge port and the control port by driving force of a solenoid
Implementation Method 2
a pressure-sensitive valve that opens and closes according to ambient pressure
Implementation Method 3
a sliding member that slides relatively to the pressure-sensitive valve member by fluid flow produced by opening of the main valve, for opening and closing the through hole
Data Source
AI summary
Provided is A displacement control valve which includes a valve housing, a valve element constituting a main valve that contacts and separates from a main valve seat, for opening and closing communication between discharge ports and control ports by driving force of a solenoid, a pressure-sensitive valve that opens and closes according to ambient pressure, and a pressure-sensitive valve member constituting the pressure-sensitive valve together with a pressure-sensitive element. The valve element and the pressure-sensitive valve member are formed with an intermediate communicating passage which allows communication between the control ports and the suction ports by opening and closing of the pressure-sensitive valve.