Brushless Motor Choke Unit for Liquid Dosing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing time-pressure dosing systems, particularly in pharmaceutical and cosmetics sectors, face challenges with unpredictable and uncontrollable valve operation due to aging and wear, leading to uncertainty in dosed quantity delivery and inability to adjust for varying liquid viscosities, which is critical for high productivity and precision applications.
Innovation Solution
A time-pressure dosing system utilizing a choke unit with a brushless motor and cam element to precisely control the obstructing element's motion between disengaged and choked positions, combined with an auxiliary device to prevent dripping, allowing for accurate and reliable dosing under electronic control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If pneumatic or electromagnetic valves are used in choke units, then the system can operate in ON-OFF mode with simple control, but the motion law becomes uncontrollable and unpredictable due to aging and wear
Solution Approach 1:
The patent replaces pneumatic or electromagnetic valves with a mechanically controlled choke unit driven by a brushless motor. The motor rotates a cam element that mechanically moves the obstructing element between choked and disengaged positions. This mechanical substitution eliminates the uncontrollable motion characteristics of pneumatic/electromagnetic valves while maintaining simple ON-OFF control functionality, achieving both ease of operation and dosing precision.
2Device complexity
If traditional valves are used, then the device structure remains simple, but the opening time varies over time making dosed quantity unpredictable
Solution Approach 1:
The patent introduces a dynamic mechanical system where a brushless motor continuously adjusts the rotation angle of a cam element to precisely control the timing of the obstructing element's movement. This dynamic control mechanism replaces static traditional valves, enabling consistent dosed quantity delivery while maintaining relatively simple device structure through the use of standard motor and cam components.
3Productivity
If high productivity is required with higher pressure, then the dosing speed increases, but the valve opening time becomes even shorter and less controllable
Solution Approach 1:
The patent implements feedback control through the electronic control unit that receives signals from a pressure sensor monitoring the tank pressure. The control unit continuously adjusts the motor's rotation angle based on the actual pressure conditions, ensuring precise control of the choke unit's opening time even at high pressures. This feedback mechanism maintains measurement precision while enabling high productivity operation.
4Ease of manufacture
If fixed valve characteristics are used, then the device is simpler to manufacture, but it cannot adapt to different liquid viscosities
Solution Approach 1:
The patent employs a dynamically adjustable choke unit where the motor can vary the rotation angle of the cam element to modify the opening time and obstructing element position. This dynamic capability allows the system to adapt to different liquid viscosities by adjusting the dosing parameters, while the underlying mechanical structure remains relatively simple and easy to manufacture using standard components.
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 achieves precise and reliable dosing with predictable time intervals and adaptability to different liquids, ensuring consistent dosed quantities even under high pressure, addressing the limitations of traditional pneumatic or electromagnetic valves.
Implementation Method 1
a brushless motor (7), in particular a direct current motor, for regulating an angular position of the shaft
Implementation Method 2
a cam element (8) which moves an obstructing element (9) between two distinct operating positions
Implementation Method 3
an auxiliary device (6), situated between the nozzle of the discharge conduit and the choke unit, also acting by mechanical interference on a corresponding section of the discharge conduit to prevent dripping of liquid
Data Source
Figure 1
Figure 2A~3B
Figure 4~5
AI summary
A time-pressure system for dosing liquids, comprising: a tank (S) of liquids which communicates with at least one discharge conduit (1); organs (P) for regulating the pressure of the liquids at a predetermined level; a choke unit (5), acting on a section (T1) of the discharge conduit (1) in order to obstruct/allow passage of the pressurised liquids coming from the tank, thus determining projection of dosed quantities of liquids externally at predetermined time intervals. In particular, the choke unit (5) comprises a brushless motor (7), which cyclically moves an obstructing element (9) between a choked position (PS) and a disengaged position (PD) of the section (T1).