Heat Pump Directional Valve With Leaf-Spring Pressure-Independent Switching
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing directional control valves for heat pump circuits are complex and require additional control valves, making them dependent on operating pressure, which limits their switching capability when pressure drops.
Innovation Solution
A directional control valve with a tiltable actuating member, designed as a V-shaped leaf spring, is operatively connected to the valve member, allowing independent switching without relying on circuit pressure, featuring a simple and cost-effective design with reduced driving force requirements and enhanced sealing due to elastic deformability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If an additional control valve is used to actuate the valve element, then the valve can be switched between operating positions, but the design becomes complex and costly
Solution Approach 1:
The invention combines the control valve functions into a single integrated unit. The valve element itself performs both the control and actuation functions by utilizing pressure differences within the circuit to switch between operating positions, eliminating the need for separate control valves while maintaining full switching capability.
Solution Approach 2:
The valve element uses the operating pressure of the heat pump circuit itself to actuate the switching mechanism. Pressure differences within the circuit automatically move the valve element between positions without requiring external control valves, making the system self-actuating and reducing complexity.
2Device complexity
If the valve element is actuated solely by operating pressure, then the design is simple, but the valve cannot be switched when operating pressure drops
Solution Approach 1:
The invention introduces an actuating element with a tilting axis that serves as an intermediary mechanism. This element translates pressure differences into reliable valve element movement, ensuring consistent switching action even when operating pressure varies or drops, while maintaining the simplicity of using only circuit pressure for actuation.
3Device complexity
If the actuating element is rigidly connected, then the structure is simple, but the sealing effect between valve element and housing is insufficient
Solution Approach 1:
The invention employs a flexible actuating element that can elastically deform during operation. This flexibility allows the element to adapt to pressure changes and maintain optimal contact between the valve element and housing surface, significantly improving the sealing effect while keeping the structure relatively simple.
Solution Approach 2:
The actuating element utilizes elastic deformation as a key operational parameter. By allowing controlled deformation of the actuating element, the system dynamically adjusts contact pressure and geometry to maximize sealing effectiveness between moving and stationary components during valve operation.
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 enables stable operation across all positions without actuator activation, reduces the complexity and cost of the actuator, and improves sealing efficiency, allowing independent switching from the operating pressure of the circuit.
Implementation Method 1
The leaf spring is elastically deformable, and in its operating positions, it deforms elastically such that it generates a force perpendicular to the direction of movement of the valve element on the valve element. This increases the sealing effect between the valve element and the surface of the valve housing
Data Source
Figure 1
Figure 2~3
Figure 4
AI summary
The invention relates to a directional control valve for a heat pump circuit, comprising: a valve housing which has at least three fluid connections (30, 32, 34, 36); a valve member which is movably mounted in the valve housing and is adjustable between at least two operating positions; and an actuator by means of which the valve member is movable in translation. To make a directional control valve which is simple and inexpensive and will work irrespective of the operating pressure of the heat pump, the actuator is operatively connected to the valve member via a pivotable actuating member, the pivot axis of the actuating member being arranged perpendicularly to the direction of movement of the valve member.