Compressor cylinder switching control method and device, unit and air conditioning system
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Solution Overview
Problem
The existing compressor cylinder switching technologies face high failure rates and reduced energy efficiency due to fluctuations in system pressure difference and operating frequency, particularly during ultralow temperature heating and high operation frequencies, leading to unreliable cylinder switching.
Innovation Solution
A method and device that adjust the operating frequency of the compressor based on the system pressure difference to meet specific cylinder switching conditions, ensuring stable pressure and frequency for reliable switching between single-cylinder and double-cylinder operations, involving the use of electromagnetic valves to manage pressure states during switching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If cylinder switching is performed during high operation frequency, then cooling/heating capacity is improved, but system pressure fluctuates abnormally and switching reliability deteriorates
Solution Approach 1:
The control method performs preliminary assessment of switching conditions before executing cylinder switching. It evaluates multiple parameters including system pressure difference, operating frequency, and temperature differential in advance to determine whether switching should be performed, preventing switching under unsuitable conditions that would cause pressure fluctuations
Solution Approach 2:
The system continuously monitors operating parameters and uses feedback control to assess whether cylinder switching conditions are met. The control device evaluates real-time system state and adjusts switching decisions based on monitored parameters, ensuring switching only occurs when system conditions are appropriate
2Productivity
If cylinder switching is performed during ultralow temperature heating starting stage, then heating capacity is improved, but system pressure difference is insufficient and switching reliability deteriorates
Solution Approach 1:
The control method performs preliminary assessment of switching conditions before executing cylinder switching. It evaluates multiple parameters including system pressure difference, operating frequency, and temperature differential in advance to determine whether switching should be performed, preventing switching under unsuitable conditions that would cause pressure fluctuations
Solution Approach 2:
The system continuously monitors operating parameters and uses feedback control to assess whether cylinder switching conditions are met. The control device evaluates real-time system state and adjusts switching decisions based on monitored parameters, ensuring switching only occurs when system conditions are appropriate
3Use of energy by moving object
If single-cylinder and double-cylinder switching technology is implemented, then energy efficiency is improved, but system complexity increases and switching stability deteriorates
Solution Approach 1:
The control system automatically assesses switching conditions and executes switching decisions without manual intervention. The electronic expansion valve and compressor work together in a self-regulating manner, with the system automatically determining when switching is appropriate based on monitored parameters
Solution Approach 2:
The control device integrates multiple functions into a single system that can handle both single-cylinder and double-cylinder operations, as well as electronic expansion valve control, through a unified control strategy that manages complexity while maintaining energy efficiency
Data Source
AI summary
The disclosure discloses a method and a device for controlling cylinder switching of a compressor, a unit and an air conditioning system. The method includes: determining whether the compressor needs to perform cylinder switching; if so, adjusting current operating frequency according to a system pressure difference so that both the adjusted operating frequency and the system pressure difference meet a cylinder switching condition of the compressor; and controlling the compressor to perform cylinder switching. At the moment, the system pressure difference and the operation frequency are stable, and would not interfere the compressor's maintaining of the single-cylinder or double-cylinder operation state, which guarantees the energy efficiency of the unit where the compressor is located, and improves the use experience of a user.