Spiral machine

Abstract

"SPIRAL MACHINE". The present invention relates to a discharge valve assembly to prevent reverse rotation of a spiral or volute compressor. The discharge valve assembly has a cup-shaped valve part, slidingly interlocked with a central column of a retaining part. The cup-shaped valve part has notches in communication between the central column of the retainer and the side walls of the cup-shaped valve part.

Claims

CLAIMS 1. Discharge valve for a spiral compressor, comprising: a valve seat surface facing downstream of a discharge passage of the spiral compressor; a valve piece having a body part for interlocking with said seat surface to close said discharge passage, said valve piece having a guide part extending axially from said body part; and a retainer that slidably interlocks with said guide part of said valve piece, said retainer having at least one passage communicating with a space between said valve piece and said retainer.

2. Discharge valve according to claim 1, wherein said guide part of said valve part has at least one vent formation communicating with said space between said valve part and said retainer.

3. Discharge valve according to claim 1, wherein said retainer has a passage extending axially, passing through it, and communicating with a space between said valve part and said retainer.

4. Discharge valve according to claim 1, wherein said valve piece has a cylindrical side wall having at least one vent formation communicating with said space between said valve piece and said retainer.

5. Discharge valve according to claim 1, which further comprises a spring between said valve part and said retainer.

6. Discharge valve according to claim 1, wherein said retainer has a cylindrical side wall portion having a plurality of holes extending radially through it.

7. Discharge valve according to claim 6, wherein said valve part has a central protruding portion received in said cylindrical side wall portion of said retainer.

8. Discharge valve according to claim 7, wherein said valve part has a cylindrical side wall portion that has received said retainer inside it.

9. Discharge valve according to claim 1, wherein said retainer has an elongated base portion and a radially extending flange portion that is received in a cylindrical side wall portion of said valve piece, said radially extending flange portion including at least one passage passing through it, in communication with a space between said valve piece and said retainer.

10. Discharge valve according to claim 9, wherein said elongated base portion of said retainer is mounted on a dividing plate, said dividing plate having at least one discharge passage extending through it.

11. Discharge valve according to claim 1, wherein said retainer has a bowl-shaped body part to receive said valve part inside.

12. Discharge valve according to claim 2, wherein said at least one vent formation has a notch in said valve part.

13. Discharge valve according to claim 4, wherein said at least one ventilation formation has a slot in the interior of said cylindrical side wall.

14. Discharge valve according to claim 2, wherein said at least one vent formation has a hole in said valve part.

15. Discharge valve for a spiral compressor, comprising: a valve seat surface disposed in a discharge passage of the spiral compressor, said valve seat surface facing downstream from the discharge passage; a valve piece having a body generally in the shape of a cup, with a cylindrical side wall and a base portion that surrounds the front end of said cylindrical side wall, said cylindrical side wall having at least one vent formed in said cylindrical side wall;and a retainer having a cylindrical outer side wall and a retainer base portion disposed at one end directed backwards, from said cylindrical outer side wall, a central rod extending axially from said retainer base portion, being received slidingly on said central rod, said central rod including a through hole extending axially through it.

16. Discharge valve according to claim 15, wherein said at least one ventilation formation has a notch in said cylindrical side wall.

17. Discharge valve according to claim 15, wherein said at least one ventilation formation has a slot in said cylindrical side wall.

18. Discharge valve according to claim 15, wherein said at least one ventilation formation has a hole in said cylindrical side wall.

19. Discharge valve for a spiral compressor, comprising: a valve seat having a conical seat surface facing downstream of a discharge passage of the spiral compressor and a first wall section generally cylindrical upstream of said conical seat surface and a second wall section generally cylindrical downstream of said conical seat surface; a valve piece having a body part that includes a seat engagement part for engaging said conical seat surface to close said discharge passage, said valve piece having a first generally cylindrical part extending axially rearward from said seat engagement part, and a second generally cylindrical part extending axially forward from said seat engagement part, wherein said seat engagement part,The aforementioned first generally cylindrical part and the aforementioned second generally cylindrical part of the aforementioned valve piece cooperate with the aforementioned conical seat surface, the aforementioned first generally cylindrical wall section and the aforementioned second generally cylindrical wall section 10 to form a seat damping cavity while the aforementioned valve piece is moved towards the aforementioned valve seat. 1 / 9 FIG I 2 / 9 FIG 2 4-24 4-20c 4-30 4-16 4-10 FIG 4 3 / 9 134 114 4 / 9 FIG 6Δ 5 / 9 FIG 7B 6 / 9 FIG 9 7 / 9 FIG II FIG 12 8 / 9 FIG 13 140 114 110 ^102 FIG 14 9 / 9 118 • .1 · · · • 99 Ο 9 9 • O Ί · · Ί · ·,