Three-Way Solenoid Valve Back Pressure Control
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Solution Overview
Problem
Existing three-way solenoid valves struggle to reliably switch refrigerant flow passages under large-differential pressure environments due to the possibility of the second valve element not separating from the valve seat, limiting the opening diameter of the second valve seat.
Innovation Solution
A three-way solenoid valve design incorporating a conduction hole that communicates with a back pressure chamber, a third valve seat, and a third valve element, along with an actuating member to change differential pressure and ensure the second valve element separates from its seat, allowing for a larger second valve port diameter without increasing the electromagnetic coil size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the second valve element is directly pressed and moved by actuating rods under large-differential pressure, then the valve can switch refrigerant flow passage, but the second valve element may not separate from the second valve seat and the opening diameter of the second valve seat cannot be made large
Solution Approach 1:
The valve is divided into two independent control paths: a first control path with a first valve element controlled by electromagnetic actuator for high-pressure sealing, and a second control path with a second valve element controlled by differential pressure for large-opening flow. This segmentation allows each valve to be optimized for its specific function without compromise.
Solution Approach 2:
A third valve element is introduced as an intermediary component that controls the back pressure chamber. By regulating the back pressure through the third valve element, the differential pressure acting on the second valve element can be precisely controlled, enabling reliable separation and opening of the second valve seat even under large pressure differentials.
2Productivity
If the opening diameter of the second valve seat is increased to ensure refrigerant flow rate, then the flow rate is improved, but the valve body size and electromagnetic coil size must be increased
Solution Approach 1:
The flow control function is segmented between two valves: the first valve element handles high-pressure sealing with a smaller opening, while the second valve element provides large-opening flow control. This allows the second valve seat to have a large opening diameter without requiring the entire valve body to be enlarged.
Solution Approach 2:
The invention changes the pressure parameter distribution by introducing a back pressure chamber controlled by the third valve element. By independently controlling the back pressure, the system can maintain large flow capacity through the second valve seat while keeping the overall valve compact, as the differential pressure control decouples the relationship between opening size and body dimensions.
3Adaptability or versatility
If a differential pressure mechanism is used to control valve elements, then the valve can function under small-differential pressure environments, but the structure becomes more complex
Solution Approach 1:
The third valve element serving the back pressure chamber serves multiple functions: it controls the differential pressure for the second valve element, manages pressure distribution in the valve body, and enables the system to adapt to both small and large differential pressure environments. This multi-functionality adds adaptability without proportionally increasing complexity.
Solution Approach 2:
The differential pressure mechanism serves itself by using the flow dynamics within the valve body to automatically establish the necessary pressure differentials. The back pressure chamber and third valve element work together to self-regulate the pressure distribution, eliminating the need for external complex control systems while maintaining adaptability across different operating 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
Enables reliable switching of refrigerant flow passages with ensured flow rates under large-differential pressure conditions without enlarging the electromagnetic coil, while simplifying manufacturing and reducing the valve's physical size.
Implementation Method 1
an electromagnetic actuator that drives the first valve element
Implementation Method 2
a biasing member that biases the third valve element toward the third valve seat
Implementation Method 3
differential pressure between the front and the rear sides of the second valve element is changed through the conduction hole
Data Source
AI summary
There is provided a very reliable three-way solenoid valve that can reliably switch a refrigerant flow passage while ensuring a refrigerant flow rate even under a large-differential pressure environment without increasing the size of an electromagnetic coil and the like.A valve body includes a conduction hole that communicates with a back pressure chamber formed on a side of a second valve element opposite to a second valve seat, a third valve seat that is positioned between the conduction hole and a second outlet, a third valve element that is movably disposed so as to approach and be separated from the third valve seat, a coil spring that biases the third valve element toward the third valve seat, and actuating rods that are interposed between a first valve element and the third valve element.