Intelligent network for chemical dispensing system
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Solution Overview
Problem
Current chemical dispensing systems for commercial washing machines face challenges such as complex wiring, inaccurate chemical dispensing, high maintenance burdens, and potential pump failures due to wear and calibration requirements, leading to inefficiencies and increased costs.
Innovation Solution
A chemical dispensing system utilizing a serial data bus network for communication between controllers, pump controllers, and machine interfaces, which reduces physical connections, enables accurate dispensing through calibrated pump activation, monitors pump status and squeeze tube wear, and includes features like product level detection and alarm notifications to prevent overuse or failure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dedicated signal lines are used to connect controller to each pump and machine interface, then reliable direct control is achieved, but system complexity and wiring requirements increase significantly
Solution Approach 1:
Multiple dedicated signal lines are merged into a single serial data bus that carries all communication between the controller and multiple pumps/machine interfaces. The controller communicates with individual devices by addressing them on the shared bus, eliminating the need for separate wiring to each component while maintaining communication reliability through protocol-based data transmission.
Solution Approach 2:
The serial data bus serves multiple functions simultaneously: it carries control signals from controller to pumps, status information from pumps to controller, and communication between machine interfaces and the controller. This single communication infrastructure replaces multiple dedicated lines, reducing wiring complexity while maintaining system reliability through its multi-functional capability.
2Object-affected harmful factors
If peristaltic pumps are used to minimize chemical contact, then operator safety is improved, but pump wear and calibration requirements increase maintenance burden
Solution Approach 1:
The system incorporates feedback mechanisms where the controller communicates with each pump to receive status information about operation, wear, and calibration state. This feedback enables the controller to monitor pump health, detect when calibration is needed, and coordinate maintenance activities, reducing the burden on operators while maintaining the safety benefits of enclosed peristaltic pump design.
Solution Approach 2:
The pump system is designed to provide self-diagnosis and self-reporting capabilities, where pumps automatically monitor their own operational status and communicate maintenance needs to the controller. This self-service approach reduces manual inspection requirements and enables proactive maintenance scheduling, addressing the maintenance complexity issue while preserving the safety advantages of minimal chemical exposure.
3Manufacturing precision
If manual calibration of each pump is performed during installation, then dispensing accuracy is improved, but installation time and expense increase
Solution Approach 1:
Pump calibration data is pre-loaded into the controller during manufacturing or initial setup, eliminating the need for manual calibration measurements during installation. The controller uses these predetermined calibration parameters to accurately control pump operation from the start, achieving dispensing accuracy without time-consuming on-site calibration procedures.
Solution Approach 2:
Manual mechanical calibration procedures are replaced with electronic calibration data storage and retrieval. Instead of physically measuring and adjusting each pump during installation, the system uses pre-programmed calibration parameters stored in the controller's memory, which are automatically applied when controlling pump operation, dramatically reducing installation time while maintaining accuracy.
4Device complexity
If controller directly switches pumps on and off based on expected dispensing time, then simple control logic is maintained, but feedback on actual dispensing accuracy is lost
Solution Approach 1:
The controller receives feedback signals from pumps indicating actual operation status and dispensing completion. This feedback loop allows the controller to verify whether the pump dispensed the intended amount of chemical, enabling correction of any discrepancies between expected and actual dispensing while maintaining relatively simple control logic through basic acknowledge and correction protocols.
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 more accurate and reliable chemical dispensing, reduces installation time and maintenance, and prevents failures by using networked communication and local pump control, ensuring consistent product delivery and minimizing waste and safety risks.
Implementation Method 1
Peristaltic pumps of this type include a flexible tube (or squeeze tube) and a rotor with one or more rollers located in a pump chamber. The one or more rollers compress a section of the squeeze tube against a wall of a pump chamber, pinching off the section of squeeze tube. When the rotor is rotated, the location of the pinched section of the squeeze tube moves along the length of the tube, thereby forcing, or pumping, fluid through the tube.
Data Source
AI summary
System and method for dispensing product to a washing machine. A chemical dispensing system includes a system controller, machine interface, and pump controller that communicate through serial data buses. The system controller provides a user interface, retrieves washing machine status information from the machine interface, and issues product dispensing commands to the pump controller. The pump controller monitors pump status and dispenses product in response to commands from the system controller. The pump controller: (1) determines pump activation periods based on calibration data stored in a pump controller memory; (2) tracks pump usage and adjusts the activation period to compensate for pump wear as the pump ages; (3) disables the pump if conditions exists that preclude operating the pump; (4) monitors product levels, and (5) reports pump status to the system controller. Integral channels are included in the pump housing to provide stress relief to a squeeze tube.