Fixed scroll and scroll compressor

A non-orbiting scroll of a scroll compressor, comprising:

• a non-orbiting scroll end plate;
• a non-orbiting scroll wrap extending from a first side surface of the non-orbiting scroll end plate;
• and
• a peripheral wall extending from the first side surface, located radially outside the non-orbiting scroll wrap and surrounding the non-orbiting scroll wrap, wherein an air inlet is provided in the peripheral wall,
• wherein the non-orbiting scroll wrap comprises a starting end connected to the peripheral wall and an engagement position to be engaged with a radial outermost tail end of an orbiting scroll wrap of an orbiting scroll of the scroll compressor, and the non-orbiting scroll wrap comprises a wrap section extending from the starting end to the engagement position,
• wherein the non-orbiting scroll further comprises a flow-guiding passage in fluid communication with the air inlet, the flow-guiding passage extends from the starting end and extends along at least a part of the wrap section,
• the wrap section comprises a first side wall located in the flow-guiding passage, the first side wall comprises a first section extending from the starting end and having a first curvature center and a second section extending from the first section and having a second curvature center, and the first curvature center and the second curvature center are respectively located on radially opposite sides of the first side wall, and
• wherein a distance between the peripheral wall and the non-orbiting scroll wrap at the engagement position is a first radial width Xm, the starting end is formed as a filleted corner, and a radius of curvature Rc of the filleted corner satisfies:
• 2 mm≤Rc≤0.4Xm.

A non-orbiting scroll of a scroll compressor, comprising:

• a non-orbiting scroll end plate;
• a non-orbiting scroll wrap extending from a first side surface of the non-orbiting scroll end plate;
• and
• a peripheral wall extending from the first side surface, located radially outside the non-orbiting scroll wrap and surrounding the non-orbiting scroll wrap, wherein an air inlet is provided in the peripheral wall,
• wherein the non-orbiting scroll wrap comprises a starting end connected to the peripheral wall and an engagement position to be engaged with a radial outermost tail end of an orbiting scroll wrap of an orbiting scroll of the scroll compressor, and the non-orbiting scroll wrap comprises a wrap section extending from the starting end to the engagement position,
• wherein the non-orbiting scroll further comprises a flow-guiding passage in fluid communication with the air inlet, the flow-guiding passage extends from the starting end and extends along at least a part of the wrap section,
• the wrap section comprises a first side wall located in the flow-guiding passage, the first side wall comprises a first section extending from the starting end and having a first curvature center and a second section extending from the first section and having a second curvature center, and the first curvature center and the second curvature center are respectively located on radially opposite sides of the first side wall,
• wherein the flow-guiding passage comprises a recessed portion recessed relative to the first side surface, the recessed portion comprises a recessed bottom wall, and a recessed depth L of the recessed bottom wall relative to the first side surface satisfies:
• L≤0.3H, wherein H is an axial height of the non-orbiting scroll wrap.