Capacity Control Valve Structure for Faster Differential Pressure Response
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Solution Overview
Problem
The existing capacity control valve has poor responsiveness to differential pressure due to the delayed application of the spring's urging force to the pressure-sensitive body, which hampers the opening of the differential pressure valve.
Innovation Solution
The capacity control valve incorporates a design with a first and second urging member sandwiching the differential pressure valve body, allowing it to open when the differential pressure decreases, and the urging force is transmitted to assist the pressure-sensitive body's contraction, enhancing responsiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the existing capacity control valve structure is used, then the structure is simple, but the responsiveness to differential pressure is poor
Solution Approach 1:
The valve is segmented into multiple functional components: a primary valve element for main flow control, a pressure-sensitive valve element for pressure-responsive control, and a differential pressure valve element for differential pressure control. This segmentation allows each element to respond to different pressure conditions independently, improving overall responsiveness without requiring complete redesign of the entire valve structure.
Solution Approach 2:
The differential pressure valve element is nested within the pressure-sensitive valve element, which itself is nested within the primary valve element. This nested configuration allows multiple control functions to be integrated in a compact arrangement, improving responsiveness while minimizing the increase in device complexity.
2Speed
If the spring's urging force is applied only after differential pressure valve body contacts the bottom portion, then the structure is simple, but the responsiveness is delayed
Solution Approach 1:
The spring is pre-compressed between the differential pressure valve body and the adapter bottom portion during assembly, storing urging force in advance. When differential pressure decreases, this pre-stored urging force is immediately applied to open the differential pressure valve, eliminating the delay that would occur if the spring were engaged only after contact with the bottom portion.
Solution Approach 2:
The spring acts as an intermediary element that continuously transmits urging force to the differential pressure valve body through the adapter structure. This intermediary mechanism ensures smooth and immediate transmission of the opening force, improving responsiveness while maintaining a relatively simple overall structure.
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 improves the responsiveness of the capacity control valve by ensuring the differential pressure valve opens promptly and assists in the contraction of the pressure-sensitive valve, facilitating faster fluid discharge and better control during startup and normal operation.
Implementation Method 1
a valve body which is moved in the axial direction by an electromagnetic force generated in a solenoid
Implementation Method 2
a pressure-sensitive body which selectively extends and contracts in the movement direction of the drive force transmitting body in correspondence with pressure in a pressure sensitive chamber
Implementation Method 3
a first urging member and a second urging member which are interposed in an accommodation portion of the adapter so as to sandwich the differential pressure valve body
Data Source
Figure 1
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Figure 3
AI summary
To provide a capacity control valve having good responsiveness for a differential pressure. A capacity control valve V includes a valve housing 10, a primary valve 50 opened and closed by a driving force of a solenoid 80, a pressure-sensitive valve 53 opened and closed by a pressure of a pressure-sensitive chamber 40, and a differential pressure valve 90 opened and closed by a differential pressure valve body 91 moved by a pressure. A control port 14 and a suction port 13 can communicate with each other through an intermediate communication path 55 by opening and closing the pressure-sensitive valve 53. An adapter 70 is provided with an accommodation portion 70d accommodating a differential pressure valve body 91, a pressure introduction path 70e communicating the control port 14 with the accommodation portion 70d, and a differential pressure communication path 70f communicating the control port 14 with the suction port 13 when opening the differential pressure valve 90. A first urging member 92 and a second urging member 93 are interposed in the accommodation portion 70d on both sides of the differential pressure valve 90 in an opening and closing direction with the differential pressure valve body 91 interposed therebetween.