Scroll compressor

A scroll compressor, comprising:

• a casing having a hermetic inner space divided into a low-pressure portion and a high-pressure portion;
• an orbiting scroll coupled to a rotational shaft in the inner space of the casing to perform an orbiting motion, and having an orbiting wrap on one side surface of an orbiting end plate thereof;
• a non-orbiting scroll having a non-orbiting wrap formed on one side surface of a non-orbiting end plate thereof facing the orbiting end plate and engaged with the orbiting wrap to form a compression chamber;
• a back pressure chamber assembly disposed on a rear surface of the non-orbiting scroll to form a back pressure chamber;
• and
• a back pressure passage that provides communication between the compression chamber and the back pressure chamber to guide a portion of refrigerant compressed in the compression chamber to the back pressure chamber, wherein the back pressure passage comprises:
• a first back pressure passage recessed by a predetermined depth in a front end surface of the non-orbiting wrap;
• and
• a second back pressure passage that communicates with the first back pressure passage and extends from inside of the non-orbiting wrap toward the back pressure chamber assembly, and wherein a cross-sectional area of the first back pressure passage is larger than a cross-sectional area of the second back pressure passage.

A scroll compressor, comprising:

• a casing having a hermetic inner space divided into a low-pressure portion and a high-pressure portion;
• an orbiting scroll coupled to a rotational shaft in the inner space of the casing to perform an orbiting motion, and having an orbiting wrap on one side surface of an orbiting end plate thereof;
• a non-orbiting scroll having a non-orbiting wrap formed on one side surface of a non-orbiting end plate thereof that faces the orbiting end plate and engaged with the orbiting wrap to form a compression chamber;
• a back pressure chamber assembly disposed on a rear surface of the non-orbiting scroll to form a back pressure chamber;
• a back pressure passage that provides communication between the compression chamber and the back pressure chamber to guide a portion of refrigerant compressed in the compression chamber to the back pressure chamber, wherein the back pressure passage is formed within a back pressure passage protrusion that extends radially inward from at least one of the non-orbiting scroll or the back pressure chamber assembly;
• and
• a back pressure regulation passage that provides communication between the compression chamber and the back pressure chamber to guide refrigerant in the back pressure chamber to the compression chamber, wherein the back pressure regulation passage is disposed on a suction side compared to the back pressure passage.