Claims
- 1. In a mixed-flow compressor having a mixed-flow impeller in which a flow-out direction in a meridional plane of the impeller is leaned from a radial direction, and a pair of diffuser plates provided downstream of the mixed-flow impeller, wherein a diffuser flow passage is identical with the flow-out direction of said mixed-flow impeller at an inlet portion and is directed to the radial direction at an outlet portion, the improvement comprising:
- a diffuser with a diffuser flow passage which is curved to the radial direction in the vicinity of the outlet of said mixed-flow impeller, and
- guide vanes each having a height, defined by a projection into the diffuser flow passage in a direction substantially transverse to the direction of flow, such that a minimum inlet radius thereof is larger than a maximum radius at the outlet of said mixed-flow impeller, wherein the guide vanes are arranged in the form of a circular cascade at the curved portion on a flow passage surface of a diffuser plate located on a shroud side.
- 2. The compressor according to claim 1, wherein an inlet angle and an outlet angle of said guide vanes are equal to an average flow angle of the outlet of said mixed-flow impeller at a design point.
- 3. The compressor according to claim 2, wherein the height of said guide vanes is ranged to be at 20 to 50% of a width of the flow passage.
- 4. The compressor according to claim 3, wherein a radius of an inlet of said guide vanes is kept constant.
- 5. The compressor according to claim 2, wherein a radius of an inlet of said guide vanes is kept constant.
- 6. The compressor according to claim 1, wherein the height of said guide vanes is ranged to be at 20 to 50% of a width of the flow passage.
- 7. The compressor according to claim 6, wherein a radius of an inlet of said guide vanes is kept constant.
- 8. The compressor according to claim 1, wherein a radius of an inlet of said guide vanes is kept constant.
- 9. In a mixed-flow compressor having a mixed-flow impeller in which a flow-out direction in a meridional plane of the impeller is leaned from a radial direction, and a pair of diffuser plates provided downstream of the mixed-flow impeller, wherein a diffuser flow passage is identical with the flow-out direction of said mixed-flow impeller at an inlet portion and is directed to the radial direction at an outlet portion, the improvement comprising:
- a diffuser with a diffuser flow passage which is curved to the radial direction in the vicinity of the outlet of said mixed-flow impeller, and
- guide vanes each having a height, defined by a projection into the diffuser flow passage in a direction substantially transverse to the direction of flow, such that a minimum inlet radius thereof is larger than a maximum radius at the outlet of said mixed-flow impeller, wherein the guide vanes are arranged in the form of a circular cascade over the whole flow passage surface of the diffuser plate located on a shroud side.
- 10. The compressor according to claim 9, wherein an inlet angle and an outlet angle of said guide vanes are equal to an average flow angle of the outlet of said mixed-flow impeller at a design point.
- 11. The compressor according to claim 10, wherein the height of said guide vanes is ranged to be at 20 to 50% of a width of the flow passage.
- 12. The compressor according to claim 11, wherein a radius of an inlet of said guide vanes is kept constant.
- 13. The compressor according to claim 10, wherein a radius of an inlet of said guide vanes is kept constant.
- 14. The compressor according to claim 9, wherein the height of said guide vanes is ranged to be at 20 to 50% of a width of the flow passage.
- 15. The compressor according to claim 14, wherein a radius of an inlet of said guide vanes is kept constant.
- 16. The compressor according to claim 9, wherein a radius of an inlet of said guide vanes is kept constant.
- 17. In a mixed-flow compressor having a mixed-flow impeller in which a flow-out direction in a meridional plane of the impeller is leaned from a radial direction, and a pair of diffuser plates provided downstream of the mixed-flow impeller, wherein a diffuser flow passage is identical with the flow-out direction of said mixed-flow impeller at an inlet portion and is directed to the radial direction at an outlet portion, the improvement comprising:
- a diffuser with a diffuser flow passage which is curved radially on a part thereof immediately after an outlet portion of aid mixed-flow impeller; and
- guide vanes each having a height, defined by a projection into the diffuser flow passage in a direction substantially transverse to the direction of flow, such that a minimum inlet radius thereof is larger than a maximum radius at the outlet of said mixed-flow impeller, wherein the guide vanes are arranged in the form of a circular cascade over the whole flow passage surface of the diffuser plate located on a shroud side.
- 18. The compressor according to claim 17, wherein an inlet angle and an outlet angle of said guide vanes are equal to an average flow angle of the outlet of said mixed-flow impeller at a design point.
- 19. The compressor according to claim 18, wherein the height of said guide vanes is ranged to be at 20 to 50% of a width of the flow passage.
- 20. The compressor according to claim 19, wherein a radius of an inlet of said guide vanes is kept constant.
- 21. The compressor according to claim 18, wherein a radius of an inlet of said guide vanes is kept constant.
- 22. The compressor according to claim 17, wherein the height of said guide vanes is ranged to be at 20 to 50% of a width of the flow passage.
- 23. The compressor according to claim 22, wherein a radius of an inlet of said guide vanes is kept constant.
- 24. The compressor according to claim 17, wherein a radius of an inlet of said guide vanes is kept constant.
Priority Claims (1)
Number |
Date |
Country |
Kind |
2-060973 |
Mar 1990 |
JPX |
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Parent Case Info
This application is a continuation of application Ser. No. 07/688,130, filed Mar. 12, 1991, abandoned.
US Referenced Citations (10)
Foreign Referenced Citations (5)
Number |
Date |
Country |
201912 |
May 1986 |
EPX |
56-38240 |
Mar 1981 |
JPX |
198798 |
Aug 1988 |
JPX |
125764 |
Aug 1949 |
SEX |
693727 |
Jul 1953 |
GBX |
Non-Patent Literature Citations (2)
Entry |
Compressed Air Magazine, vol. 9, Sep. 1985, "The X-Flo Compressor, etc." pp. 30-34. |
"Proceedings of the Sixth Turbomachinery Symposium", (Oct. 1977), pp. 61-62. |
Continuations (1)
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Number |
Date |
Country |
Parent |
668130 |
Mar 1991 |
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