Capacity Control Valve for Variable Compressor
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Solution Overview
Problem
Existing capacity control valves for variable capacity compressors face challenges in maintaining efficient discharge of liquid refrigerant during startup and maximum capacity operations, while also ensuring rapid control speed during regular and minimum capacity operations, due to limitations in aperture surface area and pressure discharge efficiency.
Innovation Solution
The capacity control valve incorporates a slit in the adapter with the third valve part, an introduction hole for control chamber pressure to act on the valve body, and a Y-ring for sealing, along with a tapered contact surface between the valve body and the third valve part, to enhance discharge efficiency and control speed by adjusting the seal diameter and applying pressure differences effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the aperture surface area is increased to enhance discharge efficiency during startup and maximum capacity operations, then the discharge rate of liquid refrigerant is improved, but the control speed during regular and minimum capacity operations deteriorates
Solution Approach 1:
The patent divides the discharge control function into two separate passages: a first discharge passage with a first valve part for startup and maximum capacity operations, and a second discharge passage with a second valve part for regular and minimum capacity operations. This segmentation allows each passage to be optimized independently - the first passage provides large aperture for high discharge rate, while the second passage provides precise control for normal operations, thereby resolving the contradiction between discharge efficiency and control speed.
2Productivity
If the pressure discharge efficiency is enhanced during maximum capacity operations, then the discharge performance is improved, but the device complexity increases
Solution Approach 1:
The patent combines multiple functions into the single valve body structure. The valve body integrates both the first valve part and second valve part, along with their respective sealing surfaces and pressure regulation mechanisms, into one unified component. This merging approach achieves high pressure discharge efficiency through optimized aperture design while avoiding the complexity of completely separate valve assemblies, as the shared structure provides common support, sealing, and control mechanisms.
3Productivity
If the seal diameter is adjusted to optimize discharge efficiency, then the discharge rate is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The patent applies different seal diameter specifications to different regions of the valve structure. The first sealing surface has a first seal diameter optimized for startup and maximum capacity discharge efficiency, while the second sealing surface has a second seal diameter optimized for regular operation control. This local differentiation of quality parameters allows each sealing region to be manufactured to its specific performance requirements rather than requiring uniform high precision across the entire valve, thereby improving discharge efficiency while managing manufacturing precision requirements.
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 configuration maintains enhanced discharge efficiency during startup and maximum capacity, while improving control speed during regular and minimum capacity operations by optimizing aperture surface areas and responsiveness to pressure changes.
Implementation Method 1
a pressure-sensitive body disposed in the third valve chamber, the pressure-sensitive body exerting an urging force in a direction for opening the first valve part by elongation, and undergoing constriction in accordance with an increase in the surrounding pressure
Implementation Method 2
a solenoid for exerting electromagnetic driving force on the valve body in a direction for closing the first valve part
Data Source
Figure 1
Figure 2
Figure 3(a)~3(c)
AI summary
The present invention provides a capacity control valve capable of enhancing the function of discharging liquid refrigerant in a control chamber during startup of a variable capacity compressor, and improving the control speed of a swash plate during control. The capacity control valve is characterized in comprising an adapter that has an annular bearing surface and is provided to a free end of a pressure-sensitive body in the elongation and constriction direction, and a valve body for discharging liquid refrigerant, moveably provided inside the adapter, wherein a slit is provided to an engaging part of the adapter with a third valve part, an introduction hole for causing the control chamber pressure to act on a bottom surface of the valve body for discharging the liquid refrigerant is provided to the base part side, and urging means is provided whereby the valve body for discharging the liquid refrigerant is urged in a valve-opening direction away from the third valve part.