Heat Pump Compressor Overpressure Shutdown Using Dual Controls
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Solution Overview
Problem
Existing methods for turning off compression apparatuses in air conditioning and heat pump systems are inefficient, have low response speed, and are prone to failure due to reliance on multiple elements, leading to safety risks when system pressure is high.
Innovation Solution
A dual control system comprising a first control apparatus connected to a pressure switch and a drive apparatus, with a second control apparatus providing fault protection to ensure the drive apparatus stops outputting a drive signal when overpressure is detected, using a signal-driven hardware approach to directly control the compression apparatus shutdown.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a main control board collects switch signals and outputs them through a module board to control compression device shutdown, then the system can monitor pressure conditions, but the response speed is low and the shutdown success rate is reduced due to multiple elements involved
Solution Approach 1:
The control system is segmented into two independent control boards (first control board and second control board), each capable of independently controlling the compression device shutdown. This segmentation eliminates the single-point-failure issue in the traditional sequential control architecture, where multiple elements (main control board + module board) were involved, thereby improving shutdown reliability without significantly increasing overall system complexity.
Solution Approach 2:
The system changes the control parameter architecture from a sequential signal transmission model to a parallel independent control model. By implementing dual independent control boards that can directly control the compression device, the system transforms the control parameter flow to eliminate intermediate transmission steps, thereby improving both response speed and shutdown success rate.
2Speed
If multiple control elements are used to monitor and control compression apparatus shutdown, then comprehensive monitoring is achieved, but the response speed decreases and system safety is compromised
Solution Approach 1:
The system implements preliminary action by having the second control board continuously monitor the operational status of the compression device and prepare shutdown commands in advance. When overpressure conditions are detected, the pre-prepared shutdown mechanism can immediately execute, eliminating the time delay associated with sequential signal processing and ensuring rapid response while maintaining high reliability.
3Ease of operation
If a sequential control architecture with main control board and module board is used, then signal processing can be distributed, but the system fails to shut off compression device when any element is damaged
Solution Approach 1:
The control system is segmented into two independent control boards (first control board and second control board), each capable of independently controlling the compression device shutdown. This segmentation eliminates the single-point-failure issue in the traditional sequential control architecture, where multiple elements (main control board + module board) were involved, thereby improving shutdown reliability without significantly increasing overall system complexity.
Solution Approach 2:
The system implements a feedback mechanism where the second control board continuously monitors the operational status of the compression device and the pressure switch signals. This real-time feedback allows the system to detect damage or failure conditions and automatically adjust control actions to ensure shutdown assurance, maintaining both ease of operation and high reliability.
Data Source
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AI summary
The present application provides turn-off protection, driving and overpressure turn-off systems, a heat pump apparatus, and an electrical device. The turn-off protection system includes a first control apparatus and a second control apparatus. The first control apparatus is in signal connection with a pressure switch apparatus when in use to output a first drive signal, and is used for stopping outputting the first drive signal according to a pressure switch action signal, where the pressure switch apparatus is turned off when a pressure of the system is detected to be overpressure and outputs the pressure switch action signal, the first drive signal is used to instruct the drive apparatus to drive a compression apparatus to operate. The second control apparatus is used to output a fault protection signal to the drive apparatus upon obtaining the pressure switch action signal and the first drive signal from the first control apparatus, where the fault protection signal is used to control the drive apparatus to stop outputting the second drive signal to the compression apparatus. An efficiency and a success rate of turning off the compression apparatus and a safety factor of an air conditioning system and a heat pump system can be improved by the present application.