Rotary two-stage compressor

Abstract

The invention provides a rotary two-stage compressor, having: a rotary shaft including two eccentric parts; a rotary compression element provided with a low pressure compression element and a high pressure compression element by a partition plate, with a roller revolved by eccentric rotation of the eccentric parts in each compression chamber; and a delivery space of the low pressure compression chamber separated from an inner space of a hermetic vessel. The said delivery space is arranged adjoining the low pressure compression element, including at least a bearing supporting a rotary shaft, a space between walls surrounding the bearing; opposing to the low pressure compression element, a delivery space cover provided with a through hole keeping communication of the rotary shaft separating the delivery space and an inner space of the hermetic vessel and supported by the bearing; the delivery space cover and the bearing are connected through an elastic body. Consequently, the invention can suppress deformation of an intermediate vessel accompanying pressure load and fastening load in a rotary two stage compressor and reduce slide loss and leak loss of refrigerant or refrigerator oil.

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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