Scroll compressor

1. A scroll compressor comprising:

a housing;

a motor provided in the housing;

a rotary shaft configured to be rotated by the motor;

an orbiting scroll configured to orbit in conjunction with the rotary shaft;

a fixed scroll configured to define a compression chamber together with the orbiting scroll; and

a discharge valve disposed on one surface of the fixed scroll and configured to open or close one or more discharge openings of the fixed scroll through which a refrigerant compressed in the compression chamber is discharged,

wherein the discharge valve further comprises:

a discharge reed plate disposed on one surface of the fixed scroll; and

a gasket retainer disposed between one surface of the fixed scroll and the housing and configured to surround the discharge reed plate,

wherein the housing further comprises:

a center housing penetrated by the rotary shaft;

a front housing configured to define a motor accommodation space together with the center housing, the motor accommodation space configured to accommodate the motor; and

a rear housing configured to define a scroll accommodation space together with the center housing, the scroll accommodation space configured to accommodate the orbiting scroll and the fixed scroll,

wherein an injection valve assembly is provided between the discharge valve and the rear housing and configured to open or close an injection flow path configured to guide a middle-pressure refrigerant to the compression chamber from outside of the housing, and

wherein the rear housing further comprises:

a first annular wall fastened to the center housing and configured to define the scroll accommodation space configured to accommodate the orbiting scroll and the fixed scroll;

a second annular wall accommodated in the first annular wall and configured to define a discharge chamber configured to accommodate the refrigerant discharged from the compression chamber; and

a third annular wall accommodated in the second annular wall and covered by the injection valve assembly, and wherein an outer peripheral portion of the gasket retainer is fixed by being pressed between the fixed scroll and the second annular wall.

2. The scroll compressor of claim 1 , wherein the discharge reed plate has one or more reed parts configured to open or close the one or more discharge openings, respectively.

3. The scroll compressor of claim 2 , wherein the one or more reed parts further comprises:

a head portion disposed to correspond to a position of the one or more discharge openings and configured to open or close the one or more discharge openings; and

a leg portion extending in one direction from the head portion.

4. The scroll compressor of claim 3 , wherein the head portion and the leg portion are formed by forming a cut-out portion in the discharge reed plate.

5. The scroll compressor of claim 2 , wherein the gasket retainer has one or more retainer parts processed to be inclined and disposed at positions corresponding to the one or more reed parts, respectively.

6. The scroll compressor of claim 5 , wherein an inclination of the one or more retainer parts restricts a position at which the one or more reed parts are opened maximally.

7. The scroll compressor of claim 1 , wherein the fixed scroll comprises one or more injection ports configured to guide the refrigerant to the compression chamber from one surface of the fixed scroll, and wherein the discharge reed plate has one or more communication ports penetratively formed to correspond to the one or more injection ports.

8. The scroll compressor of claim 7 , wherein an inner diameter of the one or more communication ports is larger than an inner diameter of the one or more injection ports or equal to the inner diameter of the one or more injection ports.

9. The scroll compressor of claim 7 , wherein the gasket retainer has one or more insertion ports penetratively formed to correspond to the one or more injection ports.

10. The scroll compressor of claim 9 , wherein an inner side of the gasket retainer is fixed by being pressed toward the fixed scroll by the injection valve assembly.

11. The scroll compressor of claim 10 , wherein the injection valve assembly further comprises:

a cover plate configured to cover the third annular wall and having an inflow port into which the middle-pressure refrigerant is introduced;

a valve plate coupled to one surface of the cover plate, which is adjacent to the discharge valve, and having an outflow port through which the refrigerant introduced into the inflow port is discharged toward the discharge valve; and

an injection valve interposed between the cover plate and the valve plate and configured to allow the inflow port and the outflow port to selectively communicate with each other.

12. The scroll compressor of claim 11 , wherein the valve plate further comprises a protruding portion protruding from one surface of the valve plate, which is adjacent to the discharge valve, toward the discharge valve and having the outflow port extending therein, and wherein at least a part of the protruding portion is inserted into the one or more insertion ports.

13. The scroll compressor of claim 12 , wherein the protruding portion further comprises:

a large diameter portion protruding from one surface of the valve plate, which is adjacent to the discharge valve, toward the discharge valve; and

a small diameter portion protruding from the large diameter portion toward the discharge valve and having an outer diameter smaller than an outer diameter of the large diameter portion, and wherein the small diameter portion is inserted into the one or more insertion ports.

14. The scroll compressor of claim 13 , wherein an axial length of the small diameter portion is shorter than an axial length of the one or more insertion ports or equal to the axial length of the one or more insertion ports.

15. The scroll compressor of claim 14 , wherein the one or more communication ports communicates with the outflow port and the one or more injection ports.