Scroll compressor with bypass holes

A scroll compressor employing therein a single-component refrigerant mainly comprising hydrofluoroolefin having a carbon-carbon double bond or a mixture refrigerant containing this refrigerant, the scroll compressor comprising:

• a stationary scroll having a stationary end plate and a stationary scroll wrap rising up from the stationary end plate, the stationary end plate having a discharge port defined therein at a central portion thereof so as to open into a discharge chamber;
• and
• an orbiting scroll having an orbiting end plate and an orbiting scroll wrap rising up from the orbiting end plate, the orbiting scroll being held in engagement with the stationary scroll to define a plurality of compression chambers therebetween, wherein
• the stationary end plate has a plurality of bypass holes defined therein to allow the compression chambers to communicate with the discharge chamber before the compression chambers communicate with the discharge port,
• a check valve is provided on at least one of the bypass holes to allow the refrigerant to flow from the compression chambers to the discharge chamber, and
• at least one of the bypass holes is a circular communication hole having a diameter D, a length L in a thickness direction of the stationary end plate, and a ratio D/L that ranges from 2.4 to 7.2.