A two-stage compressor

Abstract

The invention discloses a double-stage compressor. The double-stage compressor comprises a low-pressure-stage air cylinder and a high-pressure-stage air cylinder, wherein the low-pressure-stage air cylinder comprises a first air cylinder and a second air cylinder, which are arranged in the axis direction of the compressor, the phase difference of the first air cylinder and the second air cylinder at an air inlet beginning time falls in a range of 120 to 240 degrees, and the phase difference of the high-pressure-stage air cylinder and one of the first air cylinder and the second air cylinder at the air inlet beginning time falls in a range of 120 to 240 degrees or -60 to 60 degrees. By adopting the double-stage compressor, not only can the problem that the gas displacement of the double-stage compressor is limited be effectively solved, but also the simultaneous occurrence of an air suction peak value of the two air cylinders in the low-pressure-stage air cylinder can be avoided; moreover, when the high-pressure-stage air cylinder stays nearby the air suction peak value position, the two air cylinders at the lower-pressure stage can successively reach an exhaust peak value position, so that the air suction process and the exhaust process of the compressor can be maintained smooth, and the severe fluctuation of the compressor in the suction and exhaust processes can be avoided.

Description

technical field [0001] The invention relates to the technical field of preparation of air-conditioning compressors, in particular to a multi-cylinder two-stage compressor. Background technique [0002] The current rolling rotor two-stage compressor generally includes a low-pressure stage cylinder and a high-pressure stage cylinder. The low-pressure stage cylinder forms a stage of compressed gas after completing the stage of compression. The compressed gas undergoes secondary compression to form a secondary compressed gas. [0003] Since the low-pressure cylinder and high-pressure cylinder of the current two-stage compression cylinder only contain one cylinder, the displacement of the entire compressor is relatively limited, which is increasingly unable to meet the use environment of large-scale temperature regulation, and the current two-stage compression cylinder The suction connection between the middle and low-pressure cylinders and the high-pressure cylinders is not rea...

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Problems solved by technology

[0003] Since the low-pressure cylinder and high-pressure cylinder of the current two-stage compression cylinder only contain one cylinder, the displacement of the entire compressor is relatively limited, which is increasingly unable to meet the use environment of large-scale temperature regulation, and the current two-stage compression cylinder The suction connection between the middle and low-pressure cylinders and the high-pressure cylinders is not reasonable enough. It often happens that when the high-pressure cylinder is at the suction peak, the low-pressure cylinder does not reach the exhaust peak position or is far away from the exhaust peak position; Or when the suction rate of the high-pressure stage cylinder is low, the low-pressure stage cylinder is already at the exhaust peak position, these situations will cause the suction and exhaust pulsation between the high and low pressure stages, and the continuity of the suction and exhaust between the low pressure stage and the high pressure stage It will directly affect the performance of the compressor. When the first-stage compressed gas cannot be inhaled by the high-pressure stage cylinder in time, the first-stage compressed gas will accumulate in the intermediate chamber and cause the pressure of the intermediate chamber to rise; and when the high-pressure stage cylinder is at the suction peak If the low-pressure stage cylinder is far from reaching the exhaust peak value, this will lead to insufficient air intake of the high-pressure stage cylinder, resulting in a decline in compressor performance

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