Tube Pump Control for Pulsation Suppression via Dynamic Roller Speed
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional tube pump systems experience pulsation issues due to dynamic variations in flow rate and tube hardness, which existing methods fail to effectively suppress.
Innovation Solution
A tube pump system with a control unit that adjusts the rotation angles and angular velocities of roller units to maintain a predetermined pressure fluctuation, using a pressure detection unit to monitor and control the pressure difference between the closing and releasing positions, thereby suppressing pulsation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If the tube pump intermittently compresses the tube to supply liquid under pressure, then the liquid is discharged with required pressure, but pulsation is generated in the liquid flow
Solution Approach 1:
The control unit applies preliminary anti-action by detecting pressure fluctuations before they become significant pulsation and adjusting the roller unit's angular velocity in advance. When pressure fluctuation exceeds the threshold, the system increases the angular velocity of the roller unit to compress the tube more rapidly, preventing excessive pressure buildup and subsequent pulsation. This proactive control approach suppresses pulsation by counteracting pressure variations before they propagate through the system.
Solution Approach 2:
The invention implements dynamics by making the angular velocity of the roller unit variable rather than constant. The control unit dynamically adjusts the angular velocity based on real-time pressure fluctuation detection. When pressure fluctuation is within the threshold, the roller unit operates at normal speed; when fluctuation exceeds the threshold, the angular velocity increases to rapidly compress the tube and suppress pressure buildup. This dynamic adjustment optimizes both pressure delivery and pulsation suppression.
2Stability of the object's composition
If the pressure of liquid in the tube is increased to suppress liquid drawback, then pulsation is reduced, but the complexity of control increases
Solution Approach 1:
The control unit implements feedback control by continuously monitoring pressure fluctuations in the liquid flow and using this information to adjust the roller unit's angular velocity. The pressure sensor detects fluctuations, and when they exceed a predetermined threshold, the control unit responds by increasing the angular velocity to suppress the fluctuation. This closed-loop feedback mechanism automatically maintains stable flow without requiring complex manual intervention or multiple control components.
Solution Approach 2:
The system applies self-service by enabling the tube pump to automatically regulate its own operation through the feedback control mechanism. The pressure sensor and control unit work together to detect and correct pressure fluctuations autonomously, adjusting the roller unit's speed as needed. This self-regulating capability eliminates the need for external complex control systems or manual adjustments, allowing the system to maintain optimal performance independently.
3Adaptability or versatility
If the target flow rate is varied to meet different discharge requirements, then the system becomes more versatile, but pulsation state varies dynamically making suppression difficult
Solution Approach 1:
The control system implements dynamics by continuously adapting the roller unit's angular velocity based on real-time pressure fluctuation detection, regardless of the target flow rate setting. Whether the system operates at high or low flow rates, the control unit monitors pressure fluctuations and adjusts the angular velocity dynamically to keep fluctuations within the threshold. This dynamic adaptation ensures consistent pulsation suppression across all flow rate settings, maintaining stability while preserving versatility.
Solution Approach 2:
The invention applies parameter changes by modifying the angular velocity parameter of the roller unit in response to pressure fluctuation conditions. The control unit changes the angular velocity parameter dynamically - increasing it when pressure fluctuations exceed the threshold and maintaining normal operation when fluctuations are within acceptable ranges. This parameter adjustment strategy works effectively across different target flow rates, ensuring pulsation suppression consistency while allowing the system to adapt to various discharge requirements.
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 suppresses pulsation even with dynamic variations in flow rate and tube hardness, maintaining a stable pressure and flow rate, and promptly adjusts to minimize pulsation fluctuations.
Implementation Method 1
a pressure detection unit which is configured to detect a pressure of a liquid in a pipe connected to the other end of the tube
Implementation Method 2
a pair of roller units which are housed in the housing unit, and are rotated around the axis line from a closing position to a releasing position around the axis line in a state where the pair of roller units close the tube
Data Source
Figure 1
Figure 2
Figure 3
AI summary
Provided is a tube pump system which includes: a pair of roller units which are rotated around an axis line from a closing position to a releasing position; a pair of drive units which are configured to respectively rotate the pair of roller units; a control unit which is configured to control each of the pair of drive units; and a pressure sensor which is configured to detect a pressure of a liquid in a pipe connected to the other end of the tube, wherein the control unit controls a first rotation angle when the first roller unit passes through the closing position and a second rotation angle when the second roller unit passes through the releasing position such that fluctuation of the pressure of the liquid when the pair of roller units are rotated through at least one revolution falls within a predetermined value.