Compressor Capacity Control Valve for Rapid 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 limited design freedom and potential weakening of components like adapters and valve sections.
Innovation Solution
The design incorporates a valve housing with a first communicating passage that extends radially through a fixed core, allowing for high structural strength and efficient pressure reduction by directing fluid from the control chamber to the suction chamber, independent of the adapter's design, thus avoiding energy losses and maintaining strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the auxiliary communicating passage is formed in the adapter's annular side wall portion, then the degree of freedom in diameter is limited, but the formation of the passage impairs the strength of the adapter
Solution Approach 1:
The communicating passage function is extracted from the adapter and relocated to the valve body. The valve body now contains the communicating passage that connects the control chamber to the suction chamber, while the adapter maintains its structural integrity without having passages formed in its wall portions.
Solution Approach 2:
The valve body acts as an intermediary component that provides the communicating passage function. Instead of forming the passage in the adapter, the valve body serves as the mediating structure that enables fluid communication between chambers while maintaining the adapter's strength.
2Ease of operation
If the control pressure Pc is much higher than during continuous driving, then the discharge rate cannot be controlled properly, but reducing pressure requires discharging fluid from the control chamber
Solution Approach 1:
The communicating passage is pre-formed in the valve body structure, allowing for immediate pressure reduction when needed. The passage geometry is designed in advance to optimize fluid flow characteristics, enabling rapid pressure reduction without requiring additional components or complex assembly steps.
3Strength
If the first communicating passage is formed in the valve housing, then structural strength is maintained, but the passage must be communicable with the second valve chamber
Solution Approach 1:
The valve body is designed to serve multiple functions: it provides the first communicating passage connecting the control chamber to the suction chamber, and simultaneously provides the second communicating passage connecting the control chamber to the second valve chamber. This multi-functionality reduces the need for separate components and simplifies the overall structure.
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 solution enables rapid pressure reduction in the control chamber to levels maintained during continuous driving, ensuring efficient compressor startup while retaining high structural integrity and minimizing energy loss.
Implementation Method 1
a solenoid for exerting electromagnetic drive force on the valve body
Implementation Method 2
the first communicating passage that communicates with the pressure chamber at one end thereof and that is communicable with the second valve chamber at the other end
Data Source
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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. A displacement control valve V includes a valve housing 10 including a first valve chest 20 formed midway along a discharge-side passage, a second valve chest 30 formed midway along a suction-side passage, and a third valve chest 40 formed across the first valve chest 20 from the second valve chest 30, a valve body 50 having a first valve section 52 for opening and closing the discharge-side passage in the first valve chest 20, and a second valve section 53 for opening and closing the suction-side passage in the second valve chest 30, the first valve section 52 and the second valve section 53 being integrally formed and performing opening and closing operations in opposite directions by reciprocation thereof, and a solenoid 80 for exerting electromagnetic drive force on the valve body 50 in such a direction as to close the first valve section 52. The valve housing 10 is provided with a through hole 90a constituting a part of a first communicating passage 90 that communicates with the third valve chest 40 at one end thereof and that is communicable with the second valve chest 30 at the other end thereof.