Motor-operated compressor

Abstract

An electric compressor includes a main housing including a motor chamber. The motor chamber includes a driving motor. The compressor includes a frame fixed to one end of the main housing, a first scroll supported by one side surface of the frame, and a second scroll provided between the frame and the first scroll. The second scroll, supported by the frame, makes an orbiting motion upon receiving a rotational force from the driving motor. The second scroll also forms a compression chamber with the first scroll and a back pressure space with the frame. A rear cover coupled to the main housing forms a discharge space with the first scroll. A back pressure flow channel extends through the first scroll and the frame to guide a refrigerant and oil from the compression chamber to the discharge and back pressure spaces. The compressor also includes a plurality of decompression portions.

Description

CROSS-REFERENCE TO RELATED APPLICATION[0001]Pursuant to 35 U.S.C. § 119(a), this application claims the benefit of earlier filing date and right of priority to Korean Application No. 10-2018-0088121, filed on Jul. 27, 2018, the contents of which are incorporated by reference herein in their entirety.BACKGROUND OF THE INVENTION1. Field of the Invention[0002]The present disclosure relates to a scroll type motor-operated compressor.2. Background of the Invention[0003]Generally, compressors for compressing a refrigerant in automotive air conditioning systems have been developed in various forms. Recently, motor-operated compressors (or electric compressors) driven by electricity using motors have been actively developed as automotive parts tend to become electronic / electric components.[0004]A scroll compression method suitable for a high compression ratio operation is mainly applied to electric compressors. In a scroll type electric compressor (hereinafter, referred to as an ‘electric c...

AI Technical Summary

Benefits of technology

The patent describes an electric compressor that improves the efficiency of gas oil by increasing the decompression effect. This is achieved by increasing the length of the decompression flow channel and creating a dynamic pressure in the back pressure space to smoothly supply gas oil and reduce suction loss. The technical effect is smoother and more efficient gas oil compression.

Problems solved by technology

Furthermore, the related art decompression device is configured by inserting a component such as an orifice or a spiral bolt in the middle of the back pressure flow channel, and thus, the length of a decompression flow channel may be limited.

As a result, it is difficult to optimize the size of the decompression flow channel, which makes it difficult to maintain the back pressure space at an appropriate pressure.

Particularly, in case where a CO2 refrigerant is applied to form a discharge pressure of 100 bar or higher, a decompression effect with respect to the gas oil is further lowered compared with a case where another refrigerant (e.g., R134a or R410a) is applied, having a greater difficulty in appropriately maintaining pressure of the back pressure space.

However, as the size of the decompression flow channel is reduced to be small, the decompression flow channel may be clogged with a foreign object.

If the decompression passage is clogged, oil shortage occurs in a sliding portion to increase frictional loss or degrade performance of the compressor, or major components of the compressor may be damaged due to burning.

Further, in the related art decompression device, additional components such as an orifice or a spiral bolt are additionally provided in the back pressure flow channel to form the decompression flow channel, which, however, increases the number of components for constituting the decompression device to increase manufacturing cost.

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