Air conditioner, and shutdown control method and device for compressor thereof

Solution Overview

Problem

Inverter air conditioners experience high vibration and stress on piping when the compressor is stopped directly at high frequency, leading to a risk of piping breakage, as existing methods to reduce vibration by lowering frequency do not adequately address the issue.

Innovation Solution

A method and device for controlling the compressor shutdown by acquiring the rotor phase corresponding to the minimum load, determining the current orientation of the rotor, and stopping the compressor when it reaches this phase, thereby reducing vibration and stress on the piping.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If the compressor is stopped directly at high frequency, then the shutdown time is short and productivity is maintained, but the vibration and stress of the piping becomes too large causing danger of breakage

Engineering Contradiction:

Improveshutdown timeVSAvoidvibration and stress of piping

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The system performs preliminary detection of the rotor's instantaneous phase before shutdown, and preliminarily determines the optimal shutdown moment when the rotor is at the exhaust stroke position. This preliminary action allows the system to plan the shutdown timing in advance, ensuring that the compressor stops at the most favorable moment to minimize piping stress while maintaining quick shutdown capability.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system continuously monitors the rotor's instantaneous phase through feedback from the inverter and motor parameters, and uses this feedback information to dynamically determine the optimal shutdown moment. The feedback mechanism ensures that the shutdown decision is based on real-time rotor position data, allowing the system to stop the compressor when the rotor is at the exhaust stroke position, thereby minimizing vibration and stress on the piping.

Inventive Principle:

Principle #23Feedback

2Object-affected harmful factors

If the frequency is reduced to control the compressor to stop, then the vibration and stress of the piping is reduced at shutdown moment, but the shutdown time increases and productivity decreases

Engineering Contradiction:

Improvevibration and stress of pipingVSAvoidshutdown time

Core Design Contradiction:

Object-affected harmful factorsVSProductivity

Solution Approach 1:

The system performs preliminary detection of the rotor's instantaneous phase before shutdown, and preliminarily determines the optimal shutdown moment when the rotor is at the exhaust stroke position. This preliminary action allows the system to plan the shutdown timing in advance, ensuring that the compressor stops at the most favorable moment to minimize piping stress while maintaining quick shutdown capability.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system continuously monitors the rotor's instantaneous phase through feedback from the inverter and motor parameters, and uses this feedback information to dynamically determine the optimal shutdown moment. The feedback mechanism ensures that the shutdown decision is based on real-time rotor position data, allowing the system to stop the compressor when the rotor is at the exhaust stroke position, thereby minimizing vibration and stress on the piping.

Inventive Principle:

Principle #23Feedback

3Device complexity

If the compressor is stopped directly at high frequency, then the shutdown process is simple and device complexity is low, but the reliability of the piping system deteriorates due to high stress

Engineering Contradiction:

Improveshutdown control complexityVSAvoidpiping system reliability

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The system continuously monitors the rotor's instantaneous phase through feedback from the inverter and motor parameters, and uses this feedback information to dynamically determine the optimal shutdown moment. The feedback mechanism ensures that the shutdown decision is based on real-time rotor position data, allowing the system to stop the compressor when the rotor is at the exhaust stroke position, thereby minimizing vibration and stress on the piping.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The system replaces traditional mechanical shutdown control with an intelligent control method that uses electronic detection of rotor phase and computational determination of optimal shutdown timing. By substituting the simple mechanical stop with an electronically controlled timed shutdown, the system achieves improved piping reliability while maintaining relatively simple device complexity.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Data Source

PatentEP3258182B1Air conditioner, and shutdown control method and device for compressor thereof

Publication Date: 2021.01.27 GD MIDEA AIR CONDITIONING EQUIP CO LTD

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AI summary

A method and a device for controlling a compressor to stop are disclosed in the present disclosure. The method includes: acquiring a rotor phase corresponding to a minimum load of the compressor; during a shutdown process of the air conditioner, acquiring a current orientation of the rotor of the compressor and determining whether a phase of the rotor is the rotor phase corresponding to the minimum load according to the current orientation of the rotor; and controlling the compressor to stop if determining that the phase of the rotor is the rotor phase corresponding to the minimum load. Therefore, a generated vibration and stress of a piping is smaller than that generated by directly stopping the compressor, to effectively reduce the vibration and stress of the piping at the moment that the compressor is stopped and to avoid a danger of breaking the piping.