Inverter Integrated Controller for Constant-Pressure Pump Control
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Solution Overview
Problem
Existing constant-pressure water supply systems face challenges in integrating and setting up controllers between pressure gauges and inverters, leading to increased costs and difficulty in maintaining constant-pressure conditions, which results in frequent pump startups and shutdowns, increasing power consumption and reducing pump lifespan.
Innovation Solution
An inverter with a built-in PID controller measures pressure feedback values to determine operation conditions, such as abnormal handling, deceleration standby, or acceleration, allowing for controlled pump speed adjustments to avoid frequent startups and shutdowns, thereby reducing power consumption and extending pump life while maintaining constant-pressure control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate controller is connected between the pressure gauge and inverter, then constant-pressure control can be implemented, but the device complexity increases and integration becomes difficult
Solution Approach 1:
The patent integrates the controller directly into the inverter, merging two previously separate components (controller and inverter) into a single unified device. This eliminates the need for separate controller units and their complex interconnections, while maintaining the constant-pressure control function through the integrated controller's ability to process pressure feedback and regulate pump operation
2Reliability
If the controller adjusts pump rotation speed frequently to maintain constant pressure, then pressure stability is improved, but the pump lifespan is reduced due to frequent startups and shutdowns
Solution Approach 1:
The patent implements dynamic control strategies that adapt the pump's operation mode based on system conditions. The controller monitors pressure feedback continuously and adjusts rotation speed smoothly rather than through frequent on/off cycling. This dynamic adjustment maintains pressure stability while reducing mechanical stress on the pump, thereby extending its operational life
Solution Approach 2:
The controller incorporates preliminary detection and judgment functions that anticipate pressure variations and adjust pump operation in advance. By detecting pressure trends and predicting future deviations, the system can make proactive adjustments to rotation speed, preventing large pressure fluctuations that would require aggressive pump cycling and reducing the frequency of startup/shutdown events
Data Source
AI summary
A method for controlling a constant-pressure fluid enables an inverter with a build-in controller to control rotation speed of a pump to achieve constant-pressure control thereof. In the control method, a pressure feedback value of output flow of the pump is measured and is compared with a pressure reference value to produce an error pressure value. Afterward, an operation condition of the pump, such as an abnormal handling condition, a deceleration standby handling condition, or an acceleration condition, is determined according to the pressure error value to shut down or re-start up the pump after a delay time. Hence, the control method can avoid frequently starting up or shutting down the inverter. Therefore, the power consumption and the operation cost are reduced. The use life of the pump prolongs and constant-pressure control for the pump can be implemented.