Solenoid Capacity Control Valve for Finer Compressor Pressure Control
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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, leading to suboptimal control efficiency.
Innovation Solution
A capacity control valve with a solenoid-driven configuration, featuring a CS valve and a DC valve that transition in opposite directions at low energization, with the CS valve being primary and the DC valve auxiliary, allowing for finer control of the control pressure based on the energization current, enhancing controllability and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
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 invention divides the single valve control function into two separate valves: a CS valve (suction side) and a DC valve (discharge side). Each valve independently controls pressure by opening/closing its respective port (suction port or discharge port) to the control chamber, enabling finer and more flexible control pressure adjustment while maintaining reasonable structural complexity
Solution Approach 2:
The invention replaces the stationary orifice with constant flow path area with dynamically controllable valves whose opening degrees can be adjusted by solenoid actuation. The CS valve and DC valve can vary their effective flow area by moving their valve bodies axially, allowing the control pressure to be dynamically adjusted according to different operating conditions
2Productivity
If only a single main valve (CS valve or DC valve) is used for control, then the device complexity is low, but the control efficiency is suboptimal
Solution Approach 1:
The invention combines the functions of a suction-side pressure control valve (CS valve) and a discharge-side pressure control valve (DC valve) into a single integrated capacity control valve assembly. Both valves work cooperatively to control the control chamber pressure, with the CS valve controlling suction pressure input and the DC valve controlling discharge pressure input, achieving enhanced control efficiency through their combined action
Solution Approach 2:
The invention introduces a shared control chamber as an intermediary that receives pressure inputs from both the suction port (via CS valve) and discharge port (via DC valve). The control chamber pressure, which is the average of suction and discharge pressures, serves as the swash plate control pressure, providing a balanced and efficient control mechanism that responds to both suction and discharge conditions
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 solution provides improved control efficiency and finer control of the control pressure with increasing energization current, broadening the control range and ensuring reliable operation of the variable displacement compressor.
Implementation Method 1
a rod arranged in the valve housing and driven by the solenoid; a CS valve configured to control a fluid flow between the first control port and the suction port in accordance with a movement of the rod
Data Source
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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 16, a suction port 13, and first and second control ports 14, 15, a rod 51 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 15 and the discharge port 16 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 opened. 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 is throttled from an open state and thereafter transitions to the open state. In a maximum current state of the solenoid 80, the CS valve 50 is opened and the DC valve 53 is opened.