Movable Center Post Valve for Compressor Refrigerant Discharge
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Solution Overview
Problem
Conventional capacity control valves for variable capacity compressors face limitations in discharging liquid refrigerant during start-up, leading to inefficient refrigerant discharge due to a fixed center post and limited passage area, which restricts the discharge rate of refrigerant.
Innovation Solution
The center post is made movable to increase the passage area for discharging liquid refrigerant, and a dedicated bypass passage is provided to further enhance the discharge area when discharging refrigerant, allowing the center post to move away from the second valve portion and function as a valve seat face, with an elastic member controlling its movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the center post is made movable to increase passage area for refrigerant discharge, then the discharge rate of refrigerant is improved, but the device complexity increases
Solution Approach 1:
The center post is transformed from a fixed component to a movable one that can shift axially in response to pressure differential between control chamber and suction chamber. This dynamic adjustment automatically enlarges the passage area for liquid refrigerant discharge during start-up when high discharge rate is needed, while maintaining normal operation with the center post in its original position.
2Productivity
If a bypass passage is added to enhance discharge area, then the discharge rate of refrigerant is improved, but the device complexity increases
Solution Approach 1:
The discharge passage is segmented into two pathways: the original suction-side passage and a new bypass passage. The bypass passage provides an additional route for liquid refrigerant discharge that activates when the center post moves, effectively doubling the discharge capacity during start-up without interfering with normal operation through the original passage.
3Area of stationary object
If the center post moves away from the second valve portion, then the passage area for refrigerant discharge is increased, but the control precision becomes more difficult
Solution Approach 1:
The center post's movement is self-regulated by the pressure differential between the control chamber and suction chamber. When liquid refrigerant accumulates in the control chamber during start-up, the pressure difference automatically pushes the center post axially to enlarge the discharge passage. When discharge is complete and pressures equalize, the center post returns to its original position, eliminating the need for external control mechanisms.
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 dramatically increases the passage area for refrigerant discharge, improving the discharge rate of refrigerant from the control chamber into the suction chamber, ensuring efficient start-up and continuous operation.
Implementation Method 1
a solenoid for exerting an electromagnetic driving force for controlling the valving element
Implementation Method 2
a pressure sensitive body disposed in the third valve chamber and exerting an urging force in a direction of extension (expansion), and contracting in accordance with pressure increase of the surroundings
Data Source
Figure 1
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AI summary
The object of the present invention is to significantly improve a function for discharging a liquid refrigerant in a control chamber at the time of start-up of a variable capacity compressor by moving a center post and increasing the area of a passage for discharging the liquid refrigerant when discharging the liquid refrigerant. The present invention is characterized by including: a first valve chamber formed in the middle of the discharge-side passages 31, 32, 33; suction-side passages for providing communication between a suction chamber for sucking the fluid and the control chamber; a second valve chamber 36 and a third valve chamber 38 formed in the middle of the suction-side passages; a solenoid 60 for exerting an electromagnetic driving force for controlling a valving element 40, and in which a suction-side passage opening/closing means has a third valve portion 43 for opening and closing the suction-side passages 33, 32, 34 by receiving the pressure of the control chamber in the third valve chamber 38, and a second valve portion 42 for opening and closing the suction-side passages by receiving the electromagnetic driving force in the second valve chamber 36, and a center post 64 which is a constituent member of the solenoid is provided movably in the axial direction in such a manner that one end face thereof is opposed to the second valve portion 42, and the center post 64 is driven to the direction away from the second valve portion 42 and controlled so that the distance between the second valve portion 42 is increased when discharging the liquid refrigerant.