Rotary two-stage compressor

Abstract

The invention provides a rotary two-stage compressor. It has: a rotating shaft with two eccentric parts; a rotating compression element, which is provided with a low-pressure compression element and a high-pressure compression element through an intermediate partition. Rollers that rotate eccentrically to perform orbital motion; and a discharge space for low-pressure compression elements separated from the internal space of the airtight container. The above-mentioned discharge space is provided adjacent to the above-mentioned low-pressure compressing element, at least there is a space between the bearing that pivotally supports the above-mentioned rotating shaft and the wall surrounding the bearing, and the above-mentioned rotating shaft and A discharge space cover of the through hole in the internal space of the airtight container, the discharge space cover is opposed to the compression element for low pressure and isolates the discharge space from the internal space of the airtight container, and the discharge space cover and the bearing are connected by an elastic body. Accordingly, deformation of the intermediate container due to pressure load and fastening load in the rotary two-stage compressor is suppressed, and sliding loss and leakage loss of coolant or refrigerating machine oil can be reduced.

Description

technical field [0001] The present invention relates to a rotary compressor used in an air conditioner having a refrigeration cycle. Background technique [0002] 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 portions, a high-pressure compression element and a low-pressure compression element are provided in the airtight container in order from the motor side. [0003] 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°, and the phas...

AI Technical Summary

Problems solved by technology

If there is a difference in the dimensional accuracy and surface accuracy of the contact surface between the sub-bearing 19a and the outer wall 19c, there is a problem that a fastening load will be generated on the sub-bearing part 19a and deformation of the end plate part 19b will increase.

[0019] In addition, when the fastening load of the connection element 36 is strong, since the deformation of the outer wall portion 19c is also accompanied, the load is added to the above-mentioned sub-bearing portion 19a, and there is leakage of coolant or refrigerating machine oil from between the outer wall portion 19c and the cover 35. The issue of increased loss

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