Capacity Control Valve Structure for Low-Leakage Pressure Control
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Solution Overview
Problem
The existing capacity control valve in air conditioning systems experiences significant fluid leakage and a narrow control range due to communication between the back pressure chamber and pressure-sensitive chamber, leading to insufficient closure between the suction and control chambers.
Innovation Solution
A capacity control valve design where the fluid from the suction port is supplied to the back pressure side of the main valve body through the gap between the valve housing and main valve body, reducing leakage and enhancing the control range by seating the main valve portion on the main valve seat, and incorporating a pressure-sensitive valve body with a hollow hole for rapid pressure release.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the back pressure chamber and pressure-sensitive chamber communicate through a communication passage, then the valve structure is simplified, but fluid leakage increases and control range becomes narrow
Solution Approach 1:
The patent divides the communication path into two separate passages: one for normal control operation and another for rapid pressure release. This segmentation allows the valve to achieve both simplified structure and effective closure by preventing fluid leakage through the gap portion while maintaining communication functionality.
Solution Approach 2:
The pressure-sensitive chamber acts as an intermediary between the back pressure chamber and the control chamber. By introducing this intermediate chamber, the patent enables controlled fluid communication while preventing direct leakage paths, thus improving closure performance without significantly complicating the overall structure.
2Reliability
If the main valve body is seated on the main valve seat to close communication, then fluid leakage is reduced, but control responsiveness decreases
Solution Approach 1:
The patent applies different qualities to different regions of the valve system: the main valve portion provides tight sealing for leakage prevention, while the pressure-sensitive chamber with its communication passage enables rapid pressure equalization. This local differentiation allows the valve to achieve both effective closure and fast responsiveness.
Solution Approach 2:
The pressure-sensitive chamber is pre-configured with a communication passage that allows rapid pressure release before the main valve closes. This preliminary action prepares the system for quick response by enabling advance pressure equalization, reducing the time needed for the main valve to achieve full closure.
3Reliability
If the gap portion between valve housing and main valve body is reduced to prevent leakage, then manufacturing precision requirements increase, but assembly ease decreases
Solution Approach 1:
The pressure-sensitive chamber serves as an intermediary that compensates for gaps between the valve housing and main valve body. By routing fluid through this intermediate chamber rather than relying solely on tight gap clearance, the patent reduces manufacturing precision requirements while maintaining effective leakage prevention.
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 minimizes fluid leakage from the control to the suction side, widens the control pressure range, and improves the cooling efficiency and responsiveness of the air conditioning system by ensuring effective closure and accurate pressure control.
Implementation Method 1
a main valve body that is inserted into the valve housing and includes a main valve portion which is capable of seating on the main valve seat to open and close a communication between a suction port through which a suction fluid with a suction pressure passes and a control port through which a control fluid with a control pressure passes, using a driving force of a solenoid
Implementation Method 2
a pressure-sensitive body that applies a biasing force to the main valve body in an opening direction according to pressure of a fluid surrounding the pressure-sensitive body
Data Source
AI summary
A capacity control valve includes a valve housing provided with a main valve seat; a main valve body that is inserted into the valve housing and includes a main valve portion which is capable of seating on the main valve seat 10a to open and close a communication between a suction port and a control port using a driving force of a solenoid; and a pressure-sensitive body that applies a biasing force to the main valve body in an opening direction according to pressure of a fluid surrounding the pressure-sensitive body. The fluid is supplied from the control port to around the pressure-sensitive body, and the fluid is supplied from the suction port to a back pressure side of the main valve body.