GB1195993A - Centrifugal Pumps. - Google Patents
Centrifugal Pumps.Info
- Publication number
- GB1195993A GB1195993A GB36981/67A GB3698167A GB1195993A GB 1195993 A GB1195993 A GB 1195993A GB 36981/67 A GB36981/67 A GB 36981/67A GB 3698167 A GB3698167 A GB 3698167A GB 1195993 A GB1195993 A GB 1195993A
- Authority
- GB
- United Kingdom
- Prior art keywords
- pins
- impeller
- liquid
- pump
- flow
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 239000007788 liquid Substances 0.000 abstract 7
- 238000011144 upstream manufacturing Methods 0.000 abstract 3
- 230000005540 biological transmission Effects 0.000 abstract 1
- 230000015572 biosynthetic process Effects 0.000 abstract 1
- 239000012530 fluid Substances 0.000 abstract 1
- 239000000463 material Substances 0.000 abstract 1
- 239000000203 mixture Substances 0.000 abstract 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/18—Rotors
- F04D29/22—Rotors specially for centrifugal pumps
- F04D29/2261—Rotors specially for centrifugal pumps with special measures
- F04D29/2277—Rotors specially for centrifugal pumps with special measures for increasing NPSH or dealing with liquids near boiling-point
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
- F04D15/0005—Control, e.g. regulation, of pumps, pumping installations or systems by using valves
- F04D15/0011—Control, e.g. regulation, of pumps, pumping installations or systems by using valves by-pass valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D9/00—Priming; Preventing vapour lock
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
1,195,993. Centrifugal pumps. ROLLSROYCE Ltd. Aug.8, 1968 [Aug. 11, 1967], No.36981/67. Heading F1C. A centrifugal pump comprises an impeller and a rotor body mounted coaxially and upstream of the impeller and rotatable with the impeller, the pump being intended to be operated with a low flow inlet angle and at a low suction pressure, the rotor body having a number of circumferentially - spaced, rod-like, bluff projections extending therefrom transversely across the inlet passage of the pump. A centrifugal pump for liquid or a mixture of liquid and gas and operating at a low flow inlet angle, e.g. less than 3 degrees or 4 degrees, and at a low suction pressure e.g. about 1 or 2 pounds per square inch above the vapour pressure of the liquid, comprises pins 14 for preventing the formation under these conditions of vapour-filled regions in the eye 15 of the impeller 1 and consequent instability and decrease in flow. The pins 14 each produce a trailing cavity containing vapour or gas, the cavities being of helical form and merging together downstream of the plane of the pins to form an annular cavity extending downstream into at least the impeller eye 15. The annular cavity enables the pump to be operated stably and forms a region of fluid of lower viscosity than the liquid being pumped tending to prevent transmission of pre-whirl to the liquid upstream of the region. The reduction of pre-whirl assists in preventing instability. The length of the pins 14 is at least 30% of the distance across the flow passage and is preferably between one and six times the diameter of the pins. Instead of extending radially as shown, the pins may be inclined in either or both the axial and circumferential directions. The length and inclination of the pins may be adjustable. The cap 9 carrying the pins may have an annular lip of resilently deformable material which is snapped over an undercut annular rib on the impeller or impeller shaft. The flow through the pump may be varied by means of an iris diaphragm provided in the inlet passage 5. Otherwise, liquid may be returned from the volute 6 through a control valve 22 to a manifold 25 having an annular opening 26 extending around the inlet passage 5. Liquid discharged from the opening 26 forms a boundary layer having a low or reverse velocity and reducing the effective flow area in the inlet passage 5. Instead of an annular opening 26, nozzles facing in an upstream direction may be provided.
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB36981/67A GB1195993A (en) | 1967-08-11 | 1967-08-11 | Centrifugal Pumps. |
US751485A US3588266A (en) | 1967-08-11 | 1968-08-09 | Low specific speed rotary pump |
FR162535A FR1576894A (en) | 1967-08-11 | 1968-08-09 | |
DE1728005A DE1728005C3 (en) | 1967-08-11 | 1968-08-12 | Rotor body for centrifugal pump |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB36981/67A GB1195993A (en) | 1967-08-11 | 1967-08-11 | Centrifugal Pumps. |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1195993A true GB1195993A (en) | 1970-06-24 |
Family
ID=10392749
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB36981/67A Expired GB1195993A (en) | 1967-08-11 | 1967-08-11 | Centrifugal Pumps. |
Country Status (4)
Country | Link |
---|---|
US (1) | US3588266A (en) |
DE (1) | DE1728005C3 (en) |
FR (1) | FR1576894A (en) |
GB (1) | GB1195993A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2234295A (en) * | 1989-07-21 | 1991-01-30 | Rolls Royce Plc | Gas turbine engine compressor assembly |
CN103062101A (en) * | 2011-10-24 | 2013-04-24 | 哈米尔顿森德斯特兰德公司 | Shaft cap |
Families Citing this family (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3707334A (en) * | 1971-01-12 | 1972-12-26 | Whirlpool Co | Water pump with air lock breaking means |
JPS5418038B2 (en) * | 1971-09-12 | 1979-07-04 | ||
GB1417549A (en) * | 1972-01-12 | 1975-12-10 | Lucas Industries Ltd | Centrifugal pumps for pumping liquids |
US4120603A (en) * | 1977-03-28 | 1978-10-17 | General Motors Corporation | Jet flap controlled fuel pump |
JP2002506174A (en) * | 1998-03-13 | 2002-02-26 | ユニテック インスティテュート オブ テクノロジー | Improved pump device and method |
NZ336855A (en) * | 1999-07-21 | 2002-03-01 | Unitec Inst Of Technology | Multi-phase flow pump with vanes having large spaces there between |
GB2443423A (en) * | 2006-11-02 | 2008-05-07 | Aqualisa Products Ltd | Water pump |
US8814499B2 (en) * | 2010-04-19 | 2014-08-26 | Korea Fluid Machinery Co., Ltd. | Centrifugal compressor |
US10119551B2 (en) * | 2015-08-07 | 2018-11-06 | Hamilton Sundstrand Corporation | Anti-icing impeller spinner |
CN107642500A (en) * | 2017-10-24 | 2018-01-30 | 广州番禺高勋染整设备制造有限公司 | A kind of small-sized low-specific-speed convection pump with flow guide system |
CN109882423B (en) * | 2019-02-26 | 2020-11-06 | 西安航天动力研究所 | Centrifugal pump device with ultralow specific speed |
US20230250823A1 (en) * | 2022-02-04 | 2023-08-10 | Spike Brewing LLC | Pump |
-
1967
- 1967-08-11 GB GB36981/67A patent/GB1195993A/en not_active Expired
-
1968
- 1968-08-09 US US751485A patent/US3588266A/en not_active Expired - Lifetime
- 1968-08-09 FR FR162535A patent/FR1576894A/fr not_active Expired
- 1968-08-12 DE DE1728005A patent/DE1728005C3/en not_active Expired
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2234295A (en) * | 1989-07-21 | 1991-01-30 | Rolls Royce Plc | Gas turbine engine compressor assembly |
US5059091A (en) * | 1989-07-21 | 1991-10-22 | Rolls-Royce Plc | Gas turbine engine compressor assembly |
GB2234295B (en) * | 1989-07-21 | 1993-07-21 | Rolls Royce Plc | Gas turbine engine compressor assembly |
CN103062101A (en) * | 2011-10-24 | 2013-04-24 | 哈米尔顿森德斯特兰德公司 | Shaft cap |
CN103062101B (en) * | 2011-10-24 | 2017-03-01 | 哈米尔顿森德斯特兰德公司 | Axle cap |
Also Published As
Publication number | Publication date |
---|---|
US3588266A (en) | 1971-06-28 |
DE1728005B2 (en) | 1974-04-04 |
FR1576894A (en) | 1969-08-01 |
DE1728005C3 (en) | 1974-10-31 |
DE1728005A1 (en) | 1973-04-19 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed [section 19, patents act 1949] | ||
PLE | Entries relating assignments, transmissions, licences in the register of patents | ||
PLNP | Patent lapsed through nonpayment of renewal fees |