Control circuit, air conditioner, and control method
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Solution Overview
Problem
Existing air conditioner systems face issues with pressure relief valves that have poor sealing performance, leading to refrigerant leakage and potential dangers due to rising system pressure, and existing control circuits are not effective in preventing overpressure without additional hardware.
Innovation Solution
A control circuit with a drive module, switch module, and pressure detection module that directly controls the drive circuit to turn on or off, eliminating the need for a pressure relief valve and improving sealing performance by reducing components and response time, thus preventing refrigerant leakage and extending the life of the compressor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a pressure relief valve is arranged at the pressure vessel to reduce pressure when it exceeds safety pressure, then the system pressure can be controlled, but the sealing performance is poor leading to refrigerant leakage
Solution Approach 1:
The patent removes the pressure relief valve from the system entirely and replaces it with a control circuit that directly controls the compressor to stop operation when pressure exceeds safety limits. This extraction of the problematic component eliminates the sealing issue while maintaining pressure control functionality through a different mechanism.
Solution Approach 2:
The patent replaces the mechanical pressure relief valve with an electrical control circuit system. The pressure detection module detects pressure conditions and signals the control circuit, which then controls the compressor operation electronically, substituting mechanical pressure relief with electronic control.
2Device complexity
If the drive circuit is controlled to turn on or off directly by the first switch assembly, then the control circuit becomes simpler and response is faster, but the reliability must be maintained without additional components
Solution Approach 1:
The control circuit is segmented into distinct functional modules: pressure detection module, first switch assembly, and drive circuit. This segmentation allows each component to perform its specific function reliably while keeping the overall circuit simple. The direct connection between the first switch assembly and drive circuit eliminates intermediate components that could fail.
3Reliability
If the compressor is controlled to stop operation when system pressure is high, then pressure rise is prevented, but the drive module and compressor suffer impact when powered on repeatedly
Solution Approach 1:
The control circuit is designed to control the compressor to stop operation before dangerous pressure levels are reached, and to prevent repeated immediate startup when pressure returns to safe levels. This preliminary action prevents both overpressure conditions and excessive startup cycles, extending the service life of the compressor and drive module.
Data Source
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AI summary
Provided are a control circuit, air conditioner, and control method, the control circuit comprising: a drive module (102); a drive circuit (104), the drive circuit (104) being connected to the drive module (102); a first switch module (106), the first switch module (106) being arranged on the drive circuit (104); a pressure detection module (108), the pressure detection module (108) being connected to the first switch module (106) and used for controlling the first switch module (106) to turn on or off, and thus controlling the drive circuit (104) to turn on or off. There is no need to arrange an additional pressure relief valve to prevent overpressure, the tightness of a pressure vessel is improved, and the leakage of cold medium is reduced; the control circuit is simpler, the response is quicker, the probability of control failure due to component damage is reduced, and the reliability of the control circuit is improved.