Capacity Control Valve Restrictor Layout for Stable Coolant Discharge
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Solution Overview
Problem
Conventional capacity control valves for variable capacity compressors face challenges in efficiently discharging liquid coolant during startup and maintaining control stability due to pressure fluctuations caused by blow-by gases, leading to inefficient cooling operations and unstable control.
Innovation Solution
A capacity control valve design featuring a restrictor portion that maintains a fully opened state for efficient coolant discharge and stabilizes crank chamber pressure by separating the pressing portion from the valve element through an intermediate communication passage, allowing coolant to flow independently of suction chamber pressure, and utilizing a biasing mechanism to ensure reliable valve operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the capacity control valve uses a conventional design with communication between discharge chamber and control chamber, then the structure is simple, but the liquid coolant cannot be discharged efficiently from the control chamber at startup
Solution Approach 1:
The valve body is divided into multiple independent valve chambers (first valve chamber for suction pressure control, second valve chamber for discharge pressure control, third valve chamber for control chamber pressure control). Each chamber has dedicated communication passages and valve elements, allowing independent control of coolant flow paths. This segmentation enables efficient liquid coolant discharge from the control chamber while maintaining clear functional separation.
Solution Approach 2:
An intermediate communication passage is introduced to connect the third valve chamber (control chamber) with the first valve chamber (suction chamber), serving as a dedicated discharge path for liquid coolant. This intermediary passage allows the liquid coolant to be discharged from the control chamber through the suction chamber to the discharge chamber, improving discharge efficiency without requiring direct communication between discharge and control chambers.
2Stability of the object's composition
If the valve element directly contacts the pressing portion, then the structure is simple, but blow-by gases cause pressure fluctuations that destabilize control
Solution Approach 1:
The valve interior is segmented into separate functional zones with dedicated communication passages. The first communication passage allows suction pressure to act on the valve element independently, while the second communication passage allows discharge pressure to act on the valve element independently. This segmentation isolates the valve element from direct exposure to blow-by gases in the control chamber, stabilizing pressure control.
Solution Approach 2:
The suction pressure and discharge pressure serve as intermediary forces that indirectly control the valve element's position. Instead of directly exposing the valve element to control chamber pressure fluctuations from blow-by gases, the design uses the pressure differential between suction and discharge chambers (transmitted through dedicated communication passages) to stabilize valve operation.
3Manufacturing precision
If the valve opening degree is determined by suction pressure alone, then the control is simple, but the discharge amount cannot be precisely controlled
Solution Approach 1:
The pressure control system is segmented into two independent control loops: one controlled by suction pressure (first valve chamber) and another by discharge pressure (second valve chamber). Each loop has its own communication passage and valve element, allowing precise control of the valve opening degree by combining both pressure inputs. This dual-pressure control achieves precise discharge amount control while maintaining relatively simple individual control mechanisms.
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 efficient and rapid coolant discharge, maintaining control stability by preventing pressure increases from blow-by gases, ensuring consistent cooling operations and set discharge amounts.
Implementation Method 1
a pressure-sensitive body 178 arranged in the third valve chamber, the pressure-sensitive body to be extended and contracted by peripheral pressure
Implementation Method 2
a solenoid portion 190 which applies electromagnetic drive force to the valve element 181
Implementation Method 3
the high-pressure liquid coolant accumulated in the control chamber (crank chamber) flows into the third valve chamber 184 from the third communication passage 174
Data Source
Figure 1
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AI summary
An object is to provide a capacity control valve capable of efficiently discharging a liquid coolant irrespective of pressure of a suction chamber and improving control stability. A capacity control valve (1) includes a valve main body (10) having a first communication passage (11), a second communication passage (12), a third communication passage (13), and a main valve seat (15a), a pressure-sensitive body (24), a valve element (20) having an intermediate communication passage (29), a main valve portion (21c), and a restrictor portion (25), and a solenoid (30) that drives a rod (36). The rod (36) is relatively moved with respect to the valve element (20) so as to control an opening degree of the restrictor portion (25) .