SCROLL COMPRESSOR

Abstract

A scroll compressor includes a fixed scroll and an orbiting scroll. A base plate of at least one of the fixed scroll and the orbiting scroll includes an auxiliary discharge port and a groove. The groove is partially covered with an orbiting volute wall facing the groove, so that a compression chamber that is in a compression process and is connected to the auxiliary discharge port is not connected to other compression chambers in a compression process or to a compression chamber connected to a main discharge port. The groove is always connected to one of the compression chambers.

Description

Claims

1. A scroll compressor, comprising: a fixed scroll that includes a fixed base plate and a fixed volute wall extending from the fixed base plate; andan orbiting scroll that includes an orbiting base plate and an orbiting volute wall, the orbiting base plate facing the fixed base plate, and the orbiting volute wall extending from the orbiting base plate toward the fixed base plate and meshing with the fixed volute wall, wherein the fixed scroll and the orbiting scroll define compression chambers,the fixed base plate includes a main discharge port at a center of the fixed base plate, the main discharge port discharging a compressed fluid,at least one of the fixed base plate or the orbiting base plate includes an auxiliary discharge port located at a position different from a position of the main discharge port,the auxiliary discharge port is configured to discharge fluid in one of the compression chambers when a pressure in the compression chamber becomes greater than or equal to a preset pressure,the fixed base plate and the orbiting base plate include volute wall forming surfaces provided with corresponding volute walls,the volute wall forming surface of the base plate that includes the auxiliary discharge port includes an opening of the auxiliary discharge port, the base plate also including a groove connected to the opening,the groove is configured to be always connected to one of the compression chambers, andthe groove is configured to be partially covered with the volute wall facing the groove, so that the compression chamber that is in a compression process and is connected to the auxiliary discharge port is not connected to other compression chambers in a compression process or to the compression chamber connected to the main discharge port.

2. The scroll compressor according to claim 1, wherein a width of the groove is smaller than a width of one of the fixed volute wall and the orbiting volute wall that overlaps with the auxiliary discharge port.

3. The scroll compressor according to claim 1, wherein one of the groove or the auxiliary discharge port is configured to be connected to one of the compression chambers from a time at which fluid starts being compressed in the compression chamber.

4. The scroll compressor according to claim 1, wherein the auxiliary discharge port and the groove are formed in the fixed base plate, anda reed valve that opens and closes the main discharge port and the auxiliary discharge port is provided on a surface of the fixed base plate opposite to the volute wall forming surface.

5. The scroll compressor according to claim 1, wherein the auxiliary discharge port is one of two auxiliary discharge ports,the two auxiliary discharge ports are provided on opposite sides of the main discharge port, andthe groove is one of two grooves that are respectively connected to the two auxiliary discharge ports.

6. The scroll compressor according to claim 1, wherein the groove has a curved shape that extends along the volute wall that extends from the base plate, which includes the auxiliary discharge port.