Two-cylinder positive displacement compressor and control method

Abstract

The invention provides a two-cylinder positive displacement compressor and a control method. The two-cylinder positive displacement compressor comprises a first cylinder, a second cylinder, a compressor discharge opening, an air suction port, a first solenoid valve, a second solenoid valve, a slide plate and a pin. The compressor discharge opening is communicated with an air inlet of the second cylinder. The air suction port is respectively communicated with an air inlet of the first cylinder and the air inlet of the second cylinder. The first solenoid valve is arranged between the air suction port and the air inlet of the second cylinder. The second solenoid valve is mounted between the compressor discharge opening and the air inlet of the second cylinder. The slide plate is arranged inside the second cylinder. The pin is disposed below the slide plate. A spring is arranged below the pin. The pin has a first position for clamping the slide plate and a second position for avoiding the slide plate. By clamping the slide plate with the pin, switching between a single cylinder and two cylinders is achieved, and problems of high power consumption, low energy efficiency and the like during two-cylinder low frequency operation of the compressor are solved. By the two-cylinder operating mode at high frequency, the purpose of rapid refrigeration or heating is achieved. By the single-cylinder operating mode at low frequency, compressor power is low and energy efficiency is high.

Description

Technical field [0001] The present invention relates to the field of compressors, in particular, to a double-cylinder variable capacity compressor and a control method. Background technique [0002] At present, in order to meet users' requirements for high efficiency, energy saving and comfort of air-conditioning products, the air-conditioning system mainly adopts inverter compressors. By adjusting the speed of the compressor, the cooling capacity or heating capacity of the air-conditioning can be changed with the change of the user's load. The commonly used inverter compressors There are two types of single-cylinder and double-cylinder. When the air-conditioning load is large, if a single-cylinder compressor is used, the compressor needs to run at a higher frequency due to the compressor displacement limit. At this time, the compressor noise increases and the reliability changes. Therefore, a large displacement two-cylinder compressor should be used when the load is heavy. Howev...

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Problems solved by technology

[0003] The purpose of the present invention is to provide a double-cylinder variable capacity compressor and a control method to solve the problem of high noise and low reliability of single-cylinder high-frequency operation and power consumption of double-cylinder low-frequency operation when air conditioners simply use single-cylinder or double-cylinder compressors Large, energy-inefficient technical problems

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