Split Liquid Supply Pipe Layout to Prevent Spray Backflow
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Solution Overview
Problem
Existing liquid supply devices struggle to maintain a consistent liquid amount on a workpiece while preventing backflow and leakage, particularly when spraying over a wide area, and are prone to siphonic phenomena.
Innovation Solution
A liquid supply device with a divided supply pipe system, comprising a pump-side and spray-side supply pipes, where the upstream end of the spray-side pipe is open to the atmosphere, and an optical sensor to control the liquid discharge, ensuring consistent liquid supply and preventing backflow and leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If liquid is sprayed from a jetting nozzle onto a workpiece, then the liquid can be supplied over a wide area, but the amount of supplied liquid cannot be kept substantially constant
Solution Approach 1:
The supply pipe is divided into two separate pipes: a pump-side supply pipe that delivers liquid from the pump to an intermediate space, and a spray-side supply pipe that delivers liquid from the intermediate space to the jetting nozzle. This segmentation allows independent control of liquid supply to the spray portion, enabling consistent liquid amount control while maintaining wide area coverage capability.
2Area of stationary object
If liquid is sprayed from a jetting nozzle, then wide area coverage is achieved, but backflow and leakage may occur due to siphonic phenomenon
Solution Approach 1:
An intermediate space is introduced between the pump-side supply pipe and the spray-side supply pipe. This intermediate space acts as a buffer that prevents direct communication between the pump outlet and the spray nozzle, thereby eliminating the siphonic phenomenon that causes backflow and leakage while preserving the spray functionality for wide area coverage.
3Manufacturing precision
If liquid is dropped from a tube tip, then constant liquid amount is supplied, but liquid can only be supplied to one point on the workpiece
Solution Approach 1:
The supply system is segmented into pump-side and spray-side pipes with an intermediate space, allowing the liquid to be supplied at a controlled rate to a spray portion rather than directly dripping onto the workpiece. This enables consistent liquid amount control while the spray mechanism distributes the liquid over a wide area.
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 device maintains a constant liquid amount on the workpiece, prevents backflow and leakage, and allows for quick and efficient liquid supply, with improved maintainability and accurate control over liquid discharge.
Implementation Method 1
a pump-side supply pipe connected to the accommodation portion, the pump-side supply pipe being configured to discharge, by a predetermined amount at a time, the liquid pumped by the pump
Implementation Method 2
a spray portion configured to suction the liquid pumped from the accommodation portion to spray the liquid onto the workpiece
Data Source
AI summary
A liquid supply device for spraying liquid onto a workpiece or a jig for the workpiece. The liquid supply device includes an accommodation portion configured to accommodate the liquid, a pump configured to pump the liquid from the accommodation portion, a spray portion configured to suction the liquid pumped from the accommodation portion to spray the liquid onto the workpiece, a pump-side supply pipe connected to the accommodation portion, the pump-side supply pipe being configured to discharge, by a predetermined amount at a time, the liquid pumped by the pump, and a spray-side supply pipe including an upstream end portion into which the liquid discharged from the pump-side supply pipe flows and that is open to an atmosphere, and a downstream end portion configured to spray the liquid flowing from the upstream end portion via the spray portion.