Dual-Valve Capacity Control for Compressor Pressure Regulation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing capacity control valves for variable displacement compressors have limitations in controllability of the control pressure due to constant flow path sectional areas and lack of efficient cooperation between CS and DC valves, resulting in suboptimal control efficiency.
Innovation Solution
A capacity control valve design that includes a solenoid-driven rod, CS valve, and DC valve, where the CS valve controls fluid flow between the suction and control ports, and the DC valve controls fluid flow between the discharge and control ports, allowing for cooperative control of the control pressure with increasing energization, enabling finer control of the control pressure based on the difference in adjustments by both valves.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a stationary orifice with constant flow path sectional area is used to control the control chamber pressure, then the valve configuration can be simple, but the controllability of the control pressure is insufficient
Solution Approach 1:
The control valve is divided into two separate valves: a CS valve that controls the connection between the control chamber and suction chamber, and a DC valve that controls the connection between the control chamber and discharge chamber. This segmentation allows independent control of pressure charging and discharge processes, significantly improving control pressure controllability while maintaining reasonable structural simplicity
Solution Approach 2:
The patent replaces the stationary orifice with movable valve elements (CS valve and DC valve) that can dynamically adjust the flow path opening area. The CS valve body and DC valve body can move relative to their respective seats to vary the connection area between the control chamber and suction/discharge chambers, enabling dynamic control pressure adjustment rather than fixed flow characteristics
2Device complexity
If only a single main valve (CS valve or DC valve) is used for control, then the valve structure is simple, but the control efficiency is insufficient
Solution Approach 1:
The control function is segmented into two independent valves: the CS valve handles the suction chamber connection while the DC valve handles the discharge chamber connection. This division of control functions allows more precise and efficient control of the control chamber pressure, improving overall control efficiency without excessive structural complexity
Solution Approach 2:
Both the CS valve and DC valve work together to provide comprehensive control over the control chamber pressure, with each valve contributing to different aspects of pressure control. This multi-functional approach enhances control efficiency by utilizing both valves in coordination rather than relying on a single valve for all control functions
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 provides improved control efficiency by allowing the control pressure to be finely controlled with varying energization current, enhancing the operational efficiency of the variable displacement compressor, particularly in the intermediate range of control currents.
Implementation Method 1
a capacity control valve to be openably driven by electromagnetic force
Data Source
Figure 1
Figure 2
Figure 3
AI summary
There is provided is a capacity control valve with a favorable control efficiency in normal control. The capacity control valve includes a valve housing 10, 11 formed with a discharge port 15, a suction port 13, and first and second control ports 14, 16, a rod 51 movably arranged in the valve housing 10, 11 and driven by a solenoid 80, a CS valve 50 configured to control a fluid flow between the first control port 14 and the suction port 13 in accordance with a movement of the rod 51, and a DC valve 53 configured to control a fluid flow between the second control port 16 and the discharge port 15 in accordance with the movement of the rod 51. In a non-energization state of the solenoid 80, the CS valve 50 is closed and the DC valve 53 is closed. As the energization of the solenoid 80 becomes larger, the CS valve 50 transitions from a closed state to an open state and the DC valve 53 transitions from a closed state to an open state. In a maximum current state of the solenoid 80, the CS valve 50 is opened and the DC valve 53 is opened.