Swash plate type compressor having improved refrigerant discharge structure

1. A swash plate type compressor, comprising:

a front head portion having

a suction chamber and a discharge chamber separated from each other by a first partition wall formed on an inner surface of the front head portion, and

at least one upper discharge guide groove and at least one lower discharge guide groove formed in an upper portion and a lower portion of the discharge chamber, respectively;

a rear head portion having

a suction chamber and a discharge chamber separated from each other by a second partition wall formed on an inner surface of the rear head portion, and

at least one upper discharge guide groove and at least one lower discharge guide groove formed in an upper portion and a lower portion of the discharge chamber, respectively, to correspond to the upper and lower discharge guide grooves of the front head portion, respectively;

a cylinder installed between the front and rear head portions and having

a plurality of bores for receiving therein a number of slidable pistons,

at least one upper discharge passageway providing fluid connection between the upper discharge guide grooves of the front and rear head portions, and

at least one lower discharge passageway providing fluid connection between the lower discharge guide grooves of the front and rear head portions;

a drive shaft installed to penetrate the cylinder and rotatable by a driving source; and

an inclined swash plate installed on the drive shaft and having the pistons installed at an end portion of the swash plate.

2. The swash plate type compressor as claimed in claim 1 , wherein the upper discharge guide groove and the lower discharge guide groove formed in any of the front head portion and the rear head portion, respectively, are positioned to have a phase difference from each other.

3. The swash plate type compressor as claimed in claim 1 , further comprising a muffler portion provided at an upper side of the compressor and having

a suction port through which refrigerant flows into the compressors, and

a discharge port through which the compressed refrigerant is discharged to an outside of the compressor,

wherein

any of the front and rear head portions is in fluid connection with the discharge port of the muffler portion, and

the upper discharge guide groove of the rear head portion is in fluid connection with the discharge port, is separated by a third partition wall from the discharge chamber of the rear head portion, and is in fluid connection with the discharge chamber of the rear head portion via an additional fluid transfer element.

4. The swash plate type compressor as claimed in claim 3 , wherein the transfer element is a through hole formed in the third partition wall which separates the discharge chamber from the upper discharge guide groove of the rear head portion.

5. The swash plate type compressor as claimed in claim 3 , wherein the transfer element is a discharge conduit extending into the discharge chamber from the third partition wall which separates the discharge chamber from the upper discharge guide groove of the rear head portion.

6. The swash plate type compressor as claimed in claim 5 , wherein a sum of the volumes of the discharge conduit and the discharge chamber of the rear head portion is the same as a sum of the volumes of the discharge chamber of the front head portion and the upper discharge passageway.

7. The swash plate type compressor as claimed in claim 5 , wherein the discharge conduit extends from the third partition wall in a longitudinal direction of said discharge conduit and terminates at a point which is equally spaced, in said longitudinal direction, from said third partition wall and said second partition wall.

8. The swash plate type compressor as claimed in claim 1 , wherein both ends of the upper and lower discharge passageways are disposed in vicinity of the upper and lower discharge guide grooves of the front and rear head portions, respectively.

9. The swash plate type compressor as claimed in claim 1 , further comprising

a muffler portion provided at an upper side of the compressor and having

a suction port through which refrigerant flows into the compressors, and

a discharge port through which the compressed refrigerant is discharged to an outside of the compressor, and

a communication channel providing fluid connection between the upper discharge guide groove of the rear head portion and the discharge port of the muffler portion.

10. The swash plate type compressor as claimed in claim 1 , wherein

the discharge chamber of the front head portion is formed at an inner side with respect to the first partition wall and the suction chamber of the front head portion is formed at an outer side with respect to the first partition wall; and

the discharge chamber of the rear head portion is formed at an inner side with respect to the second partition wall and the suction chamber of the rear head portion is formed at an outer side with respect to the second partition wall.

11. The swash plate type compressor as claimed in claim 10 , wherein the upper and lower discharge guide grooves of the front and rear head portions are in fluid connection with the discharge chambers of the front and rear head portions, respectively.

12. A swash plate type compressor, comprising:

front and rear head portions, each having a suction chamber and a discharge chamber which are separated from each other by a partition wall formed on an inner surface of said head portion;

a cylinder installed between the front and rear head portions and having

a plurality of bores for receiving therein a number of slidable pistons, and

at least two discharge passageways located in upper and lower portions of the cylinder, respectively, and providing fluid connection between the discharge chambers of the front and rear head portions;

a drive shaft installed to penetrate the cylinder and rotatable by a driving source; and

an inclined swash plate installed on the drive shaft and having the pistons installed at an end portion of the swash plate.

13. The swash plate type compressor as claimed in claim 12 , further comprising a muffler portion provided at an upper side of the compressor and having

a suction port through which refrigerant flows into the compressor, and

a discharge port through which the compressed refrigerant is discharged to an outside of the compressor;

wherein a discharge passageway disposed at a most upper portion of said at least two discharge passageways is in fluid connection with the discharge port of the muffler portion.

14. The swash plate type compressor as claimed in claim 12 , wherein, in each of the front and rear head portions, the discharge chamber is formed at an inner side with respect to the partition wall and the suction chamber is formed at an outer side with respect to the partition wall.

15. The swash plate type compressor as claimed in claim 14 , wherein at least two discharge guide grooves in fluid connection with the discharge chambers are formed on the inner surfaces of the front and rear head portions, and the discharge guide grooves of the front and rear head portions are in fluid connection with each other via the discharge passageways.

16. The swash plate type compressor as claimed in claim 15 , further comprising a muffler portion provided at an upper side of the compressor and having

a suction port through which refrigerant flows into the compressors, and

a discharge port through which the compressed refrigerant is discharged to an outside of the compressor;

wherein the discharge guide groove of the rear head portion is in fluid connection with the discharge port of the muffler portion, is separated by a further partition wall from the discharge chamber of the rear head portion, and is in fluid connection with the discharge chamber of the rear head portion via an additional fluid transfer element.

17. The swash plate type compressor as claimed in claim 16 , wherein the transfer element is a through hole formed in the further partition wall which separates the discharge chamber of the rear head portion from the discharge guide groove.

18. The swash plate type compressor as claimed in claim 16 , wherein the transfer element is a discharge conduit extending into the discharge chamber from the further partition wall which separates the discharge chamber of the rear head portion from the discharge guide groove.

19. The swash plate type compressor as claimed in claim 18 , wherein a sum of the volumes of the discharge conduit and the discharge chamber of the rear head portion is the same as a sum of the volumes of the discharge chamber of the head portion and a discharge passageway in fluid connection with the discharge guide groove that is in fluid connection with the discharge conduit.

20. The swash plate type compressor as claimed in claim 18 , wherein the discharge conduit extends from said further partition wall in a longitudinal direction of said discharge conduit and terminates at a point which is equally spaced, in said longitudinal direction, from said further partition wall and the partition wall that separates the suction chamber and the discharge chamber of the rear head portion.

21. The swash plate type compressor as claimed in claim 12 , wherein, in each of the front and rear head portions, the discharge chamber is formed at an outer side with respect to the partition wall and the suction chamber is formed at an inner side with respect to the partition wall.

22. The swash plate type compressor as claimed in claim 21 , further comprising:

a muffler portion provided at an upper side of the compressor and having

a suction port through which refrigerant flows into the compressor, and

a discharge port through which the compressed refrigerant is discharged to an outside of the compressor;

a communication channel providing fluid connection between the discharge chamber of any of the front and rear head portions and the discharge port of the muffler portion.

23. The swash plate type compressor as claimed in claim 12 , wherein at least one of the discharge passageways is disposed at a lower side of the front and rear head portions.