Compressor Displacement Control Valve for Fast Startup Pressure Relief
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Solution Overview
Problem
Existing displacement control valves for variable displacement compressors face challenges in quickly reducing control chamber pressure during startup while maintaining structural strength, due to limitations in forming auxiliary communicating passages that impair the adapter's strength.
Innovation Solution
The displacement control valve incorporates a first communicating passage within the valve housing that connects the pressure chamber to the suction chamber, allowing for high-strength formation and quick pressure reduction by directing fluid from the control chamber into the suction chamber during startup, with the passage being either axial or radial and formed within a rigid valve housing or fixed core.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If an auxiliary communicating passage is formed in the adapter to connect the pressure chamber and the intermediate communicating passage, then the control chamber pressure can be reduced quickly during startup, but the adapter's structural strength is impaired
Solution Approach 1:
The auxiliary communicating passage is extracted from the adapter and relocated to the valve housing. This separates the flow path function from the adapter structure, allowing the adapter to maintain its structural integrity while the valve housing provides the additional communication path for rapid pressure reduction during startup.
Solution Approach 2:
The valve housing serves as an intermediary structure that houses the auxiliary communicating passage. Instead of modifying the adapter directly, the invention uses the valve housing as a mediator to provide the additional flow path, thereby protecting the adapter's strength while achieving rapid pressure reduction.
2Ease of manufacture
If the auxiliary communicating passage is formed with limited degree of freedom in diameter, then the adapter structure is simplified, but the pressure reduction capability is compromised
Solution Approach 1:
The auxiliary communicating passage is extracted from the adapter and placed in the valve housing, which provides greater design freedom. This allows the passage to be optimized for pressure reduction capability without being constrained by the adapter's manufacturing limitations.
Solution Approach 2:
The invention moves the auxiliary communicating passage to a different spatial location (the valve housing) where there is more freedom in determining the passage diameter and configuration, thereby improving pressure reduction capability without compromising adapter manufacturing simplicity.
3Speed
If multiple flow paths are used to discharge fluid from the control chamber, then the pressure reduction speed is improved, but energy losses from interfering flow paths increase
Solution Approach 1:
The discharge function is segmented into two independent flow paths: the intermediate communicating passage and the auxiliary communicating passage. These segmented paths operate independently without interfering with each other, allowing rapid pressure reduction while minimizing energy losses from flow interference.
Solution Approach 2:
The invention provides continuous and independent flow paths for fluid discharge. The auxiliary communicating passage operates continuously alongside the intermediate passage, ensuring uninterrupted and efficient fluid discharge from the control chamber without the energy losses associated with interfering flow paths.
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 enables rapid pressure reduction in the control chamber to levels maintained during continuous driving, while retaining high structural strength and avoiding energy losses associated with interfering flow paths, thus enhancing the compressor's efficiency and reliability.
Implementation Method 1
a solenoid for exerting electromagnetic drive force on the valve body in such a direction as to close the first valve section
Implementation Method 2
a pressure-sensitive element that is disposed in the third valve chest, and exerts an urging force in such a direction as to open the first valve section by its extension and contracts with an increase in ambient pressure
Data Source
AI summary
Provided is a displacement control valve capable of quickly reducing pressure in a control chamber to a level of pressure kept during continuous driving, at the time of the startup of a variable displacement compressor. The valve housing is provided with a through hole constituting a part of a first communicating passage that communicates with a pressure chamber at one end thereof and that is communicable with a second valve chest at the other end thereof.