Dispenser Nozzle Pressure Control for Stable Gas-Paste Foam
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Solution Overview
Problem
Existing methods for discharging a mixture of gas and paste material from a dispenser often result in nozzle clogging or uneven bubble dispersion due to inappropriate pressure levels, leading to ineffective foam formation.
Innovation Solution
A method involving a dispenser with a nozzle part, a movable needle part, and a stopper position adjusting mechanism to control discharge pressure within a range of 4 MPa to 15 MPa, using a pressure sensor and electric motor to adjust the needle's position, ensuring appropriate bubble dispersion in the foam.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the pressure of the paste material is increased to 4 MPa or higher for efficient transport, then the material can be transported effectively through the pipe, but the flow path may become narrow causing clogging due to crushed hardening agents or temperature increase from friction
Solution Approach 1:
The invention employs a movable needle part that can dynamically adjust the flow path opening degree during material discharge. The needle part moves along the axial direction to change the gap between its tip and the nozzle opening, allowing real-time adaptation of flow resistance to prevent clogging while maintaining transport efficiency
Solution Approach 2:
The invention changes the physical parameter of flow path cross-sectional area by moving the needle part to different positions. This dynamic parameter adjustment controls the flow rate and pressure distribution, preventing the flow path from becoming too narrow and causing clogging while maintaining efficient material transport
2Reliability
If the pressure of the paste material is decreased to avoid clogging, then the flow path remains open, but the gas bubbles become larger and may break during transport, leading to uneven bubble dispersion and gas escape at discharge
Solution Approach 1:
The movable needle part dynamically adjusts the flow path opening to maintain optimal pressure conditions. By precisely controlling the needle position, the system prevents both excessive pressure (causing clogging) and insufficient pressure (causing bubble coalescence), thereby maintaining uniform bubble dispersion throughout the material
Solution Approach 2:
The invention incorporates a pressure sensor that detects the internal pressure of the material and provides feedback to the control unit. The control unit processes this pressure information and adjusts the needle part position accordingly, creating a closed-loop control system that maintains optimal pressure for bubble stability and uniform dispersion
3Device complexity
If a fixed needle position is used for simplicity, then the device structure remains simple, but the discharge pressure cannot be adjusted to maintain optimal pressure range of 4 MPa to 15 MPa
Solution Approach 1:
The invention transforms the static needle position into a dynamic, adjustable parameter. The drive unit enables the needle part to move along the axial direction, allowing the discharge pressure to be adjusted by changing the needle position, thus providing operational flexibility without significantly complicating the overall device structure
Solution Approach 2:
The control unit automatically processes pressure sensor signals and adjusts the needle part position to maintain optimal discharge pressure. This automated pressure control system reduces the need for manual intervention and simplifies operation while maintaining precise pressure adjustment capability
Data Source
AI summary
A dispenser for discharging a mixture of gas and a paste material includes: a nozzle part (2) provided in a tip end part of a body (11) and having a tip end opening; a flow path (4) for the mixture extending from an introduction part (5) for the mixture to the tip end opening through a hollow space of the nozzle part; a needle part (3) movable in the flow path of the nozzle part to open and close the flow path 4; a driving part (7, 8, and 9) that drives the needle part; and a stopper part (10, 14, and 16) that limits an operation range of the needle part. The nozzle part as a tapered section in which an inside diameter of the flow path of the nozzle part relative to an operation range of a tip end of the needle part decreases toward the tip end opening.