Capacity control valve
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Solution Overview
Problem
Existing capacity control valves for variable-capacity compressors face challenges in efficiently discharging liquid refrigerant from the control chamber during startup, due to complex structures and high discharge resistance, limiting the discharge flow and requiring a clutch mechanism for capacity control.
Innovation Solution
The capacity control valve is redesigned with completely separated discharge-side and intake-side passages, featuring a liquid-refrigerant discharge valve supported by a pressure-sensitive body and an elastic body, allowing for adjustable bore and improved discharge flow, preventing unintended opening during continuous operation, and ensuring reliable discharge even with low solenoid thrust force and bellows load.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a complex discharge valve structure with integrated passages is used, then the valve can control both discharge and intake functions, but the discharge resistance increases and discharge flow decreases
Solution Approach 1:
The patent divides the discharge valve into separate discharge-side and intake-side passages, with independent valve elements (first valve 76 and second valve 75) for each passage. This segmentation eliminates the flow resistance caused by integrated passages while maintaining the dual function of controlling both discharge and intake flows separately, thereby resolving the contradiction between versatility and productivity.
2Productivity
If the discharge valve structure is simplified, then the discharge flow improves, but the ability to prevent unintended opening during continuous operation may be compromised
Solution Approach 1:
The patent introduces a pressure-sensitive body (bellows 78) as an intermediary mechanism that responds to pressure differential between discharge chamber and intake chamber. This bellows provides automatic feedback control to the valve elements, ensuring stable closure during continuous operation while allowing simplified discharge passages to maintain high discharge flow capability, thus resolving the contradiction between productivity and reliability.
3Device complexity
If the solenoid thrust force is reduced, then the valve structure becomes simpler, but the ability to open the valve against bellows load decreases
Solution Approach 1:
The patent extracts the primary opening force requirement from the solenoid by utilizing the pressure differential between discharge chamber and intake chamber acting on the bellows. The solenoid only needs to provide sufficient force to overcome the reduced bellows resistance during startup, rather than needing high thrust to open the valve against full bellows load continuously. This extraction resolves the contradiction between device complexity and opening force capability.
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 simplified discharge valve structure and adjustable bore enhance the compressor's ability to discharge liquid refrigerant efficiently at startup, expanding the control range and reliability of liquid refrigerant discharge, while preventing unintended valve opening and ensuring effective operation under varying pressure conditions.
Implementation Method 1
a pressure-sensitive body (bellows) 78 placed in the third valve chamber to apply a biasing force in the extending (expanding) direction while contracting as the ambient pressure increases
Implementation Method 2
a solenoid S, etc., that applies an electromagnetic drive force to the valve element 81
Data Source
AI summary
A capacity control valve includes: intake-side passages connecting an intake chamber that takes in fluid and a control chamber; a pressure-sensitive chamber formed midway along the intake-side passages; a liquid-refrigerant discharge valve that receives the pressure of the control chamber to open and close the intake-side passages; a pressure-sensitive body placed in the pressure-sensitive chamber, which extends to apply a biasing force to the liquid-refrigerant discharge valve in the direction of closing the valve, while contracting as the ambient pressure increases; and a solenoid that applies an electromagnetic drive force to control the main valve; wherein the pressure-sensitive body is supported on one side by the driving rod of the solenoid in a manner permitting relative motion, while connected on the other side to the liquid-refrigerant discharge valve, wherein the discharge valve structure and discharge flow passages for discharging liquid refrigerant are simplified.