Rotary two-stage compressor

Abstract

The invention provides a rotary two-stage compressor, providing in a sealed container with: a rotary shaft driven by a motor and having two eccentric parts; a rotary compression element wherein a low pressure compression element and a high pressure compression element with rollers provided in compression chambers respectively and put in revolving motion by the eccentric rotation of the eccentric parts are provided through an intermediate partition plate; and intermediate passages connected to the compression chamber of the low pressure compression element and the compression chamber of the high pressure compression element and separated from the internal space of the sealed container. Pressure in the sealed container is the pressure of discharge gas compressed by the high pressure compression element, and each compression chamber is provided with an end plate and the intermediate partition plate in the direction of the rotary shaft. As to the radial width of the sealing surface at theupper and lower end faces of the roller facing the end plate and intermediate plate, the radial width of the sealing surface of the roller used for the low pressure compression element is made largerthan that of the sealing surface of the roller used for the high pressure compression element. The invention can reduce power consumption of a compressor by suppressing the increase of leakage loss or sliding loss at a sealing surface of a roller.

Description

Rotary 2-Stage Compressor technical field The present invention relates to a rotary compressor used in an air conditioner having a refrigeration cycle. Background technique Conventionally, as a rotary type two-stage compressor used in a refrigeration cycle, for example, a structure disclosed in JP-A-60-128990 (hereinafter referred to as Patent Document 1) has been common. This prior art compressor has an electric motor composed of a stator and a rotor on the inside of a hermetic container. The rotating shaft connected to the motor has two eccentric parts. As a compression mechanism corresponding to these eccentric parts, a compression element for high pressure and a compression element for low pressure are provided in order from the motor side inside the airtight container. The eccentric rotation of each compression element by the eccentric portion of the rotating shaft causes the rollers to perform orbital motion. These eccentric parts have a phase difference of 180°,...

AI Technical Summary

Problems solved by technology

Regardless of whether ΔP1>ΔP2 or not, since the seal width t1<seal width t2, for example, if the sealing performance of the roller sealing surface of the high-pressure compression element is appropriate, there is a gap from the seal surface of the roller of the low-pressure compression element. Large leakage of coolant and refrigerating machine oil, and high power consumption of the compressor

Conversely, when the sealing performance of the roller sealing surface of the low-pressure compression element is adequate, there is a problem that the excessive sliding loss of the sealing surface of the roller sealing surface of the high-pressure compression element is large, and the power consumption of the compressor is large.

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