Centrifugal compressor and water chilling unit having the same

Patent metadata

Field	Value
Publication number	US-2016273553-A1
Application number	US-201415037740-A
Country	US
Kind code	A1
Filing date	Jul 24, 2014
Priority date	Nov 22, 2013
Publication date	Sep 22, 2016
Grant date	—

Abstract

The invention discloses a centrifugal compressor and a water chilling unit having the same. The centrifugal compressor includes an impeller ( 2 ), a diffuser ( 3 ), a volute ( 8 ) and an exhaust diffuser pipe ( 9 ), the diffuser ( 3 ) including a pressurization passage, air flowing through the impeller ( 2 ) entering an inlet of each pressurization passage, the volute ( 8 ) being configured to collect the air pressurized by the diffuser ( 3 ), the exhaust diffuser pipe being communicated with the volute, and an extending direction of the exhaust diffuser pipe inclining downwards with respect to a horizontal plane. The extending direction of the exhaust diffuser pipe communicated with the volute inclines downwards with respect to the horizontal plane, so that noise and airflow losses of high-temperature and high-pressure air in the exhaust diffuser pipe expelled from the centrifugal compressor due to bending of the pipe can be reduced, and the noise can be effectively reduced.

First claim

1 . A centrifugal compressor, comprising:
an impeller ( 2 ); a diffuser ( 3 ), the diffuser ( 3 ) comprising a pressurization passage ( 31 ), and air flowing through the impeller ( 2 ) entering an inlet of the pressurization passage ( 31 ); a volute ( 8 ), configured to collect the air pressurized by the diffuser ( 3 ); and an exhaust diffuser pipe ( 9 ), communicated with the volute ( 8 ), an extending direction of the exhaust diffuser pipe ( 9 ) inclining downwards with respect to a horizontal plane.

2 . The centrifugal compressor according to claim 1 , wherein an angle between the extending direction of the exhaust diffuser pipe ( 9 ) and the horizontal plane is A, wherein 15°≦A≦90°.

3 . The centrifugal compressor according to claim 1 , wherein the centrifugal compressor further comprising a coolant passage ( 4 ) configured to import a coolant from the outside, the coolant passage ( 4 ) comprising a liquid spraying hole ( 41 ) provided at an inlet end of the pressurization passage ( 31 ).

4 . The centrifugal compressor according to claim 3 , wherein a liquid spraying direction of the liquid spraying hole ( 41 ) is perpendicular to a flowing direction of the air in the pressurization passage ( 31 ).

5 . The centrifugal compressor according to claim 1 , further comprising:
a drive motor; a gear box ( 5 ); a spindle ( 6 ), mounted at the gear box ( 5 ), one end of the spindle ( 6 ) being connected with the impeller ( 2 ); a first gear ( 7 ), mounted at the spindle ( 6 ); a drive shaft, mounted at the gear box ( 5 ), the drive shaft being in drive connection with the drive motor; a second gear, mounted at the drive shaft and meshing with the first gear ( 7 ); and a lubricating system, lubricating oil of the lubricating system being contained in a lower cavity of the gear box ( 5 ).

6 . The centrifugal compressor according to claim 5 , further comprising a three-oil-wedge bearing configured to mount the spindle ( 6 ) and/or the drive shaft at the gear box ( 5 ).

7 . The centrifugal compressor according to claim 5 , wherein the coolant passage ( 4 ) comprises a first flow guide hole ( 42 ) provided in an inner of a side wall of the gear box ( 5 ) and communicated with the liquid spraying hole ( 41 ).

8 . The centrifugal compressor according to claim 7 , wherein the diffuser ( 3 ) further comprises a first partition plate ( 32 ) and a second partition plate ( 33 ) parallel to the first partition plate ( 32 ), the first partition plate ( 32 ) comprising an annular base plate abutting against an outer side of the side wall of the gear box ( 5 ) and a plurality of flow guide plates vertically provided on a surface, opposites to the side wall of the gear box ( 5 ), of the base plate, the flow guide plates being uniformly provided in a circumferential direction of the base plate, and every two adjacent flow guide plates forming the corresponding pressurization passage ( 31 ); and the coolant passage ( 4 ) comprises a plurality of liquid spraying holes ( 41 ) corresponding to a plurality of pressurization passages ( 31 ), each pressurization passage ( 31 ) at least corresponding to one liquid spraying hole ( 41 ).

9 . The centrifugal compressor according to claim 8 , wherein the coolant passage ( 4 ) further comprises a second flow guide hole ( 43 ) configured to communicate the liquid spraying hole ( 41 ) with the first flow guide hole ( 42 ), the second flow guide hole ( 43 ) comprising a first hole-section ( 431 ) extending from an interior of the base plate to the side wall of the gear box ( 5 ) and second hole-sections ( 432 ) configured to communicate the liquid spraying hole ( 41 ) with the first hole-section ( 431 ); and the coolant passage ( 4 ) further comprises an elongated slot which is provided at the outer side of the side wall of the gear box ( 5 ) or which is provided at the surface, abutting against the outer side of the side wall of the gear box ( 5 ), of the first partition plate ( 32 ) and configured to communicate the second hole-sections ( 432 ), the elongated slot being communicated with the first flow guide hole ( 42 ).

10 . The centrifugal compressor according to claim 5 , wherein at least some of box walls forming the gear box ( 5 ) are double-layer walls.

11 . The centrifugal compressor according to claim 10 , wherein each double-layer wall comprises an inner sound insulation wall ( 51 ) and an outer sound insulation wall ( 52 ) provided at an outer side of the inner sound insulation wall ( 51 ) at an interval, the thickness of the outer sound insulation wall ( 52 ) is D, and the thickness of the inner sound insulation wall ( 51 ) is H, where D is greater than H.

12 . The centrifugal compressor according to claim 11 , wherein D is greater than H+5 mm.

13 . The centrifugal compressor according to claim 11 , wherein D is greater than 20 mm and less than 30 mm, and H is greater than 15 mm and less than 25 mm.

14 . The centrifugal compressor according to claim 2 , further comprising:
a drive motor; a gear box ( 5 ); a spindle ( 6 ), mounted at the gear box ( 5 ), one end of the spindle ( 6 ) being connected with the impeller ( 2 ); a first gear ( 7 ), mounted at the spindle ( 6 ); a drive shaft, mounted at the gear box ( 5 ), the drive shaft being in drive connection with the drive motor; a second gear, mounted at the drive shaft and meshing with the first gear ( 7 ); and a lubricating system, lubricating oil of the lubricating system being contained in a lower cavity of the gear box ( 5 ).

15 . The centrifugal compressor according to claim 3 , further comprising:
a drive motor; a gear box ( 5 ); a spindle ( 6 ), mounted at the gear box ( 5 ), one end of the spindle ( 6 ) being connected with the impeller ( 2 ); a first gear ( 7 ), mounted at the spindle ( 6 ); a drive shaft, mounted at the gear box ( 5 ), the drive shaft being in drive connection with the drive motor; a second gear, mounted at the drive shaft and meshing with the first gear ( 7 ); and a lubricating system, lubricating oil of the lubricating system being contained in a lower cavity of the gear box ( 5 ).

16 . The centrifugal compressor according to claim 4 , further comprising:
a drive motor; a gear box ( 5 ); a spindle ( 6 ), mounted at the gear box ( 5 ), one end of the spindle ( 6 ) being connected with the impeller ( 2 ); a first gear ( 7 ), mounted at the spindle ( 6 ); a drive shaft, mounted at the gear box ( 5 ), the drive shaft being in drive connection with the drive motor; a second gear, mounted at the drive shaft and meshing with the first gear ( 7 ); and a lubricating system, lubricating oil of the lubricating system being contained in a lower cavity of the gear box ( 5 ).

17 . A water chilling unit, comprising a centrifugal compressor according to claim 1 .

18 . A water chilling unit, comprising a centrifugal compressor according to claim 2 .

19 . A water chilling unit, comprising a centrifugal compressor according to claim 3 .

20 . A water chilling unit, comprising a centrifugal compressor according to claim 4 .

Assignees

• Gree Electric Appliances Inc Zhuhai

Inventors

• Jiang Nan
• Zhong Ruixing
• Jiang Caiyun
• Xie Rong
• Wang Hongxing
• Liu Jianfei
• Chen Yuhui

Classifications

• F04D17/10 Primary

  for compressing or evacuating · CPC title

• F04D29/444

  Bladed diffusers · CPC title

• F04D29/063

  specially adapted for elastic fluid pumps · CPC title

• F04D29/4206

  especially adapted for elastic fluid pumps · CPC title

• F05B2260/96

  Preventing, counteracting or reducing vibration or noise · CPC title