Compressor with a muffler

1. A compressor comprising:

a case comprising a discharge portion disposed at one side of the case, the discharge portion being configured to discharge refrigerant from the case;

a drive unit coupled to an inner circumferential surface of the case;

a rotary shaft that extends from the drive unit in a direction away from the discharge portion and that is configured to rotate about an axis;

an orbiting scroll coupled to the rotary shaft and configured to rotate based on a rotation of the rotary shaft;

a fixed scroll engaged with the orbiting scroll, the fixed scroll defining a compression space configured to receive, compress, and discharge refrigerant; and

a muffler that is coupled to the fixed scroll, and that defines a receiving space configured to guide refrigerant toward the discharge portion,

wherein the fixed scroll comprises:

a fixed head plate that is coupled to the inner circumferential surface of the case and that defines the compression space, and

a fixed shaft accommodation portion that is configured to accommodate the rotary shaft,

wherein the fixed head plate defines:

a discharge hole that extends through the fixed head plate and that is configured to discharge compressed refrigerant toward the receiving space of the muffler, and

a bypass hole that extends through the fixed head plate and that is configured to guide refrigerant in the receiving space of the muffler toward the discharge portion,

wherein the fixed shaft accommodation portion includes a protruding portion that protrudes from the fixed head plate toward the muffler,

wherein the discharge hole is spaced apart from the fixed shaft accommodation portion and extends through the fixed head plate in an axial direction, and

wherein a thickness of the fixed head plate in the axial direction is less than a thickness of the protruding portion of the fixed shaft accommodation portion in the axial direction.

2. The compressor of claim 1 , wherein the orbiting scroll comprises an orbiting wrap disposed at one surface of the orbiting scroll,

wherein the fixed head plate comprises a fixed wrap coupled to the orbiting wrap, the fixed head plate having an exposed surface facing the muffler, and

wherein a distance from the exposed surface of the fixed head plate to a distal end of the discharge hole facing the discharge portion is less than a distance from the exposed surface of the fixed head plate to a distal end of the fixed shaft accommodation portion facing the muffler.

3. The compressor of claim 1 , wherein the fixed head plate comprises a depressed portion that extends from the discharge hole toward the muffler and that penetrates a portion of the fixed head plate.

4. The compressor of claim 3 , wherein a diameter of the depressed portion is greater than a diameter of the discharge hole.

5. The compressor of claim 4 , wherein the depressed portion defines a slope with respect to the rotary shaft, and

wherein the slope of the depressed portion increases as a distance from the discharge hole to the depressed portion increases.

6. The compressor of claim 4 , wherein the depressed portion defines a slope with respect to the rotary shaft, and

wherein the slope of the depressed portion decreases as a distance from the discharge hole to the depressed portion increases.

7. The compressor of claim 1 , wherein a distance between a distal end of the bypass hole and a surface of the muffler is greater than a distance between the surface of the muffler and a distal end of the fixed shaft accommodation portion facing the muffler.

8. The compressor of claim 1 , wherein the fixed head plate further comprises:

a guide that protrudes from the fixed head plate toward the muffler, that is disposed radially outward of the bypass hole, and that is configured to guide refrigerant to the bypass hole.

9. The compressor of claim 1 , wherein the bypass hole is located radially outward of the discharge hole.

10. The compressor of claim 1 , wherein the discharge hole is disposed radially outward of the fixed shaft accommodation portion, and the bypass hole is located radially outward of the discharge hole.

11. The compressor of claim 1 , wherein the fixed head plate comprises:

a depressed portion that extends from the discharge hole through the fixed head plate in the axial direction; and

a concave portion that is recessed toward the discharge portion from an exposed surface of the fixed head plate facing the muffler.

12. The compressor of claim 11 , wherein the depressed portion is defined at a first side of the fixed head plate with respect to the rotary shaft, and

wherein the concave portion is defined at a second side of the fixed head plate with respect to the rotary shaft.

13. The compressor of claim 12 , wherein the fixed head plate further comprises a guide that protrudes from the fixed head plate toward the muffler, that is disposed radially outward of the bypass hole, and that is configured to guide refrigerant to the bypass hole.

14. The compressor of claim 13 , wherein the guide is disposed at the second side of the fixed head plate with respect to the rotary shaft.

15. The compressor of claim 1 , wherein a distal end of the fixed shaft accommodation portion faces and contacts an inner surface of the muffler.

16. The compressor of claim 1 , wherein the rotary shaft defines a plurality of oil holes that radially extend from an inside of the rotary shaft toward an outer circumferential surface of the rotary shaft and that are arranged along the axial direction of the rotary shaft.

17. A compressor comprising:

a case comprising a discharge portion disposed at one side of the case, the discharge portion being configured to discharge refrigerant from the case;

a drive unit coupled to an inner circumferential surface of the case;

a rotary shaft that extends from the drive unit in a direction away from the discharge portion and that is configured to rotate about an axis;

an orbiting scroll coupled to the rotary shaft and configured to rotate based on a rotation of the rotary shaft;

a fixed scroll engaged with the orbiting scroll, the fixed scroll defining a compression space configured to receive, compress, and discharge refrigerant; and

a muffler that is coupled to the fixed scroll, and that defines a receiving space configured to guide refrigerant toward the discharge portion,

wherein the fixed scroll comprises:

a fixed head plate that is coupled to the inner circumferential surface of the case and that defines the compression space, and

a fixed shaft accommodation portion that is configured to accommodate the rotary shaft,

wherein the fixed head plate defines:

a discharge hole that extends through the fixed head plate and that is configured to discharge compressed refrigerant toward the receiving space of the muffler, and

a bypass hole that extends through the fixed head plate and that is configured to guide refrigerant in the receiving space of the muffler toward the discharge portion,

wherein the fixed shaft accommodation portion includes a protruding portion that protrudes from the fixed head plate toward the muffler,

wherein the discharge hole is spaced apart from the fixed shaft accommodation portion and extends through the fixed head plate in an axial direction,

wherein the discharge hole extends from a first end facing the muffler to a second end facing the discharge portion, and

wherein an axial length of the discharge hole from the first end to the second end in the axial direction is less than a distance from the first end of the discharge hole to a distal end of the protruding portion of the fixed shaft accommodation portion facing the muffler.

18. A compressor comprising:

a case comprising a discharge portion disposed at one side of the case, the discharge portion being configured to discharge refrigerant from the case;

a drive unit coupled to an inner circumferential surface of the case;

a rotary shaft that extends from the drive unit in a direction away from the discharge portion and that is configured to rotate about an axis;

an orbiting scroll coupled to the rotary shaft and configured to rotate based on a rotation of the rotary shaft;

a fixed scroll engaged with the orbiting scroll, the fixed scroll defining a compression space configured to receive, compress, and discharge refrigerant; and

a muffler that is coupled to the fixed scroll, and that defines a receiving space configured to guide refrigerant toward the discharge portion,

wherein the fixed scroll comprises:

a fixed head plate that is coupled to the inner circumferential surface of the case and that defines the compression space, and

a fixed shaft accommodation portion that is configured to accommodate the rotary shaft,

wherein the fixed head plate defines:

a discharge hole that extends through the fixed head plate and that is configured to discharge compressed refrigerant toward the receiving space of the muffler, and

a bypass hole that extends through the fixed head plate and that is configured to guide refrigerant in the receiving space of the muffler toward the discharge portion,

wherein the fixed shaft accommodation portion protrudes from the fixed head plate toward the muffler,

wherein the discharge hole is spaced apart from the fixed shaft accommodation portion and extends through the fixed head plate in an axial direction, and

wherein the fixed head plate comprises a concave portion having a thickness in the axial direction, the thickness of the concave portion decreasing from the fixed shaft accommodation portion to the bypass hole.

19. The compressor of claim 18 , wherein the concave portion is recessed toward the discharge portion from an exposed surface of the fixed head plate facing the muffler.