Switching Method of Single and Double Cylinders for Variable Frequency and Variable Capacity Compressors

Abstract

The invention provides a method for switching single and double cylinders of variable frequency and variable capacity compressors. The single and double cylinder switching method of the variable frequency and variable capacity compressor includes: step S1: determine the operating frequency range of the compressor when the single cylinder is switched to double cylinder; step S2: determine the compressor operating frequency range when the double cylinder is switched to single cylinder; step S3: Detect the current operating state and operating frequency of the compressor, and when the detected operating state and operating frequency of the compressor meet the condition for cutting cylinders, quickly execute the action of switching from single cylinder to double cylinders or switching from double cylinders to single cylinder. According to the single-cylinder and double-cylinder switching method of the frequency conversion and variable capacity compressor of the present invention, the single-cylinder and double-cylinder switching of the compressor can be realized quickly, and the reliability of the single-cylinder and double-cylinder switching can be guaranteed.

Description

technical field [0001] The invention relates to the field of air conditioners, in particular to a method for switching between single and double cylinders of variable frequency and variable capacity compressors. Background technique [0002] There is an air conditioner on the market that uses a compressor with frequency conversion and variable capacity functions. Through the opening and closing of the reversing solenoid valve and the function of the one-way valve, the lower cylinder of the compressor is selectively connected to the high-pressure side or the low-pressure side. When the lower cylinder is connected to the high-pressure side, the lower cylinder is idling. At this time, only the upper cylinder of the compressor performs compressor work, and the compressor is in a single-cylinder operation state; when the lower cylinder is connected to the low-pressure side, the lower cylinder can perform compression work. At this time, the compressor In the state of double cylind...

AI Technical Summary

Problems solved by technology

[0004] 1. Regardless of the current operating frequency of the compressor, the cylinder will be cut immediately after reaching the condition of cutting cylinder. This switching method will easily cause drive protection when the frequency of the compressor is too high or too low, and the reliability cannot be guaranteed.

[0005] 2. After the compressor reaches the cylinder cut-off condition, the operating frequency of the compressor will be increased and lowered, and then a transition switch will be performed. This will require a certain transition time for the cylinder cut-off process, and it is impossible to achieve instant cylinder cut-off when the cylinder cut-off is required.

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