Three-Way Flow Control Valve With Multistage Orifice for Cavitation Control
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Solution Overview
Problem
In mold temperature control systems, the variation of supply pressure due to changes in set flow rate causes interference among piping systems, and the existing solutions struggle to effectively manage pressure loss and cavitation, leading to unstable flow rate control and potential internal damage.
Innovation Solution
A flow rate control device utilizing a three-way valve with a multistage throttle orifice on the A port side, which decompresses fluid pressure in stages, maintaining symmetrical flow rate characteristics and preventing cavitation by ensuring adequate back pressure, is implemented to suppress supply pressure variation and pressure loss influence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a two-way valve is used for flow rate control, then the flow rate can be regulated, but the supply pressure varies along the Q-H curve causing interference among piping systems
Solution Approach 1:
The patent inverts the conventional two-way valve approach by using a three-way valve with symmetrical flow rate characteristics. Instead of regulating flow by restricting one path (causing pressure variation), the three-way valve divides flow between two paths while maintaining constant total flow rate, thereby keeping supply pressure constant and eliminating interference among piping systems.
Solution Approach 2:
The patent applies local quality by creating symmetrical flow rate characteristics on both A port and B port sides of the three-way valve. By ensuring equal pressure loss characteristics on both sides through carefully designed flow paths, the valve maintains balanced flow distribution and constant total flow rate, resolving the pressure variation issue.
2Productivity
If the set flow rate is varied to improve heating speed, then energy saving effect is achieved, but pressure adjustment cannot be completely corresponded when flow rate becomes extremely small
Solution Approach 1:
The patent inverts the conventional approach by using a three-way valve that maintains constant total flow rate regardless of individual port flow rates. This allows the system to achieve high heating speed when needed while maintaining reliable pressure control even at extremely small flow rates, as the constant total flow ensures pressure stability across the entire operating range.
3Speed
If pump rotational speed is varied rapidly to control flow rate, then response speed improves, but mutual interference occurs between pressure control and flow rate control
Solution Approach 1:
The patent inverts the control strategy by using a three-way valve with symmetrical characteristics that decouples pressure control from flow rate control. The constant total flow rate characteristic eliminates mutual interference between pressure and flow rate control, allowing rapid response without compromising control stability.
4Stability of the object's composition
If a throttle orifice is provided to balance pressure loss, then flow rate characteristics become symmetrical, but cavitation occurs on the secondary side due to low back pressure
Solution Approach 1:
The patent segments the single-stage throttle orifice into a multi-stage structure with multiple throttle orifices arranged in series. This segmentation allows progressive pressure reduction across multiple stages, maintaining adequate back pressure at each stage to prevent cavitation while still achieving symmetrical flow rate characteristics through careful design of each stage's pressure loss.
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 effectively stabilizes flow rate control by maintaining constant supply pressure and preventing cavitation, ensuring precise control and reducing the risk of internal damage in the piping system.
Implementation Method 1
a multistage throttle orifice for decompressing the pressure of the fluid in stages is provided on the A port side
Implementation Method 2
there is a problem that the pressure adjustment cannot be completely corresponded... influence of pressure loss and cavitation on a secondary side
Data Source
AI summary
Provided is a flow rate control device capable of suppressing variation of supply pressure caused by variation of set flow rate and suppressing influence of pressure loss and cavitation on a secondary side. The flow rate control device (18) includes: a flow rate regulating valve (19) that regulates a flow rate of fluid flowing in a flow path; a flow meter (20) that measures the flow rate of the fluid flowing in the flow path; and a control portion (21) that controls an opening degree of the flow rate regulating valve (19) based on a measurement result of the flow meter (20), the flow rate regulating valve (19) is a three-way valve for dividing to regulate fluid flowing in from an inflow port (24) to a first outflow port (25) and a second outflow port (26), the flow meter (20) is connected to the second outflow port (26) side, and a multistage throttle orifice (22) for decompressing the pressure of the fluid in stages is provided on the first outflow port (25) side.