Refrigerating air conditioner

Abstract

The object of the present invention is to obtain a refrigerating and air-conditioning apparatus, that is, there is no structural restriction in the main compression mechanism (7), and no adjustments are made to the first airtight container (8) and the second airtight container (4). The height of setting, just can adjust the oil surface height of the lubricating oil (9) of the first airtight container (8) and the second airtight container (4). The refrigerating and air-conditioning device of the present invention has a first oil equalizing pipe (21) and a second oil equalizing pipe (22), and the first oil equalizing pipe (21) is connected to a first airtight container that accommodates the main compression mechanism (7) and lubricating oil (9) (8) and the bottom of the second airtight device (4) that accommodates expansion mechanism (2), auxiliary compression mechanism (3) and lubricating oil (9), and this second oil equalizing pipe (22) links the second airtight container ( 4) The position higher than the required minimum oil level height A on the side surface and the suction side of the main compression mechanism (7), the inside of the first airtight container (8) is the suction pressure atmosphere, and the inside of the second airtight container (4) The space is separated from the expansion mechanism (2) and the auxiliary compression mechanism (3), and the pressure in the second airtight container (4) does not depend on the pressure in the expansion mechanism (2) and the pressure in the auxiliary compression mechanism (3).

Description

technical field [0001] The present invention relates to a refrigerating and air-conditioning device used in an air conditioning device or a refrigerator, having two or more airtight containers for accommodating compression mechanisms, in particular to an oil equalizing mechanism between the airtight containers. Background technique [0002] In order to improve the COP (Coefficient of Performance), some refrigerating and air-conditioning devices used in air-conditioning devices and refrigerators have a main compressor that compresses refrigerant and an expander that has an expansion mechanism that expands the refrigerant. And the auxiliary compression mechanism that converts the expansion energy of the expansion mechanism into mechanical energy for operation. In such a refrigerating and air-conditioning device, in order to prevent reliability degradation caused by sintering or abnormal wear of the sliding parts of the main compressor and expander, it is necessary to adjust th...

AI Technical Summary

Problems solved by technology

[0008] However, in the refrigerating and air-conditioning apparatus of Patent Document 1, it is necessary to install a suction pipe leading to the main compression mechanism in the airtight container for the main compressor, and the position of the suction pipe is also limited.

[0009] In addition, in the refrigerating and air-conditioning apparatuses of Patent Document 2 and Patent Document 3, unless the two compressors are installed at the same height, there is a problem that the oil level of the lubricating oil cannot be adjusted.

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