Dual-Orifice Venturi Vacuum Drawback for Coolant Drainback
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Solution Overview
Problem
Existing coolant delivery systems face challenges in draining coolant that remains in the system downstream from leak detection or during maintenance, leading to increased stop work delays due to continuous coolant discharge.
Innovation Solution
A dual orifice venturi vacuum drawback assembly is introduced, featuring a fluid supply passage, fluid return passage, bypass passage, and dual orifice venturi valve, which creates a vacuum to draw back coolant through primary and secondary orifices, and an air breather check valve to facilitate drainage by allowing air ingress, preventing further coolant discharge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the coolant supply passage is closed upon leak detection or maintenance, then coolant flow to the device is stopped, but coolant remaining downstream continues to discharge increasing stop work delay
Solution Approach 1:
The patent applies preliminary action by activating the vacuum drawback system immediately upon leak detection or maintenance initiation. The controller automatically opens the bypass valve to activate the venturi vacuum generator, which creates negative pressure to draw remaining coolant back through the return passage before maintenance work begins, preventing continuous discharge during the maintenance period.
Solution Approach 2:
The patent uses an intermediary mechanism - the vacuum drawback system with venturi valve and bypass passage - that mediates between the closed supply passage and the remaining coolant. This intermediary system creates a controlled vacuum environment that actively retrieves coolant through the return passage, bridging the gap between shutting off supply and completely draining the system.
2Object-generated harmful factors
If the coolant supply passage is closed during maintenance, then coolant discharge is prevented, but remaining coolant continues to leak requiring extended cleanup time
Solution Approach 1:
The system applies self-service by automatically initiating the coolant retrieval process through the controller that detects leaks or maintenance conditions. The controller autonomously opens the bypass valve to activate the vacuum system, which then self-regulates to draw coolant through the venturi effect and return passage, reducing the need for manual intervention and extending maintenance windows.
Solution Approach 2:
The patent extracts the remaining coolant from the downstream section of the supply passage using the vacuum drawback system. The venturi valve creates negative pressure that actively pulls coolant out through the return passage and back to the reservoir, removing the harmful discharged coolant before maintenance personnel need to perform cleanup operations.
3Ease of operation
If a simple shutoff valve is used to stop coolant flow, then the system is simple to operate, but it cannot drain remaining coolant effectively
Solution Approach 1:
The patent applies pneumatic principles through the venturi vacuum generator, which uses fluid dynamics to create negative pressure. As coolant or water flows through the venturi valve, it creates a pressure differential that draws additional coolant through the bypass passage and return passage via the shutoff valve, enhancing the draining capability beyond what a simple mechanical shutoff could achieve.
Solution Approach 2:
The system changes the pressure parameter by introducing negative pressure through the vacuum drawback mechanism. The controller opens the bypass valve to allow the venturi system to create sub-atmospheric pressure in the return passage, which reverses the pressure gradient and enables coolant to be drawn back through the shutoff valve and into the reservoir, effectively removing remaining coolant.
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 system effectively prevents coolant discharge during maintenance or leak detection, reducing stop work delays by efficiently draining coolant from the system, thereby minimizing downtime and cleanup efforts.
Implementation Method 1
dual orifice venturi valve... creates a vacuum to draw back coolant through primary and secondary orifices
Implementation Method 2
air breather check valve that introduces air into the assembly to facilitate the draining of the fluid
Data Source
AI summary
A dual orifice venturi vacuum drawback assembly includes a fluid supply passage that supplies fluid to the device, a fluid return passage that returns fluid from the device, a shutoff valve position on the fluid supply passage, a bypass passage, a bypass valve positioned on the bypass passage, and a dual orifice venturi valve. The bypass passage includes an inlet connected to the fluid supply passage upstream of the shutoff valve, and an outlet connected to the fluid return passage. The dual orifice venturi valve is positioned on the bypass passage upstream of the bypass valve. The dual orifice venturi valve includes a venturi inlet, a venturi outlet, a primary orifice, and a secondary orifice. The primary orifice is connected to a primary drawback opening on the fluid return passage. The secondary orifice is connected to a secondary drawback opening on the fluid return passage.