EP0276252B1 - Compresseur rotatif a vis - Google Patents
Compresseur rotatif a vis Download PDFInfo
- Publication number
- EP0276252B1 EP0276252B1 EP87904634A EP87904634A EP0276252B1 EP 0276252 B1 EP0276252 B1 EP 0276252B1 EP 87904634 A EP87904634 A EP 87904634A EP 87904634 A EP87904634 A EP 87904634A EP 0276252 B1 EP0276252 B1 EP 0276252B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- low pressure
- rotor
- working space
- compressor
- port
- 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 - Lifetime
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
- F04C29/12—Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
- F04C18/08—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
- F04C18/12—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type
- F04C18/14—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons
- F04C18/16—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons with helical teeth, e.g. chevron-shaped, screw type
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C28/00—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids
- F04C28/08—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids characterised by varying the rotational speed
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C28/00—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids
- F04C28/18—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids characterised by varying the volume of the working chamber
Definitions
- the present invention relates to a screw rotor compressor of the kind specified in the preamble of the claim.
- a screw rotor compressor is disclosed in US patent No. 4 435 139 and comprises a casing composed of a barrel portion and two end plate portions enclosing a working space generally in the shape of two intersecting bores and provided with low pressure and high pressure ports.
- a pair of intermeshing male and female rotors provided with external helical lands and grooves are rotatably mounted within the working space for sealing cooperation with each other and with the walls of the working space. During the rotation of the rotors a pair of rotor grooves are brought into communication with the low pressure port and continuously filled with low pressure gas.
- Two such grooves brought out of communication with the low pressure port are then brought into communication with each other at the low pressure end wall, as a land of the female rotor starts to enter the male rotor groove, whereby the free volume of the male rotor groove decreases to a certain value before a male rotor land starts to enter the female rotor groove.
- the total volume of the two grooves combined in a chevron-shaped chamber will thus be reduced by about 20 % before the full intermesh of the rotors completely takes over the sealing at the axial low pressure end of the chamber.
- the object of the present invention is to make it possible to reduce the volumetric capacity of a compressor running at low speed beyond the reduction corresponding to the speed reduction.
- the screw compressor shown in Figs. 1 and 2 comprises a casing 10 forming a working space 12 substantially in the form of two intersecting cylindrical bores having parallel axes.
- the casing 10 is further provided with a low pressure channel 14 and a high pressure channel 16 for the working fluid which channels communicate with the working space 12 through a low pressure port 18 and a high pressure port 20, respectively.
- the low pressure port 18 is located in its entirety in the low pressure end wall 22 of the working space 12 and extends mainly on one side of the plane containing the axes of the bores.
- the high pressure port 20 of the compressor shown is located partly in the high pressure end wall 24 of the working space 12 and partly in its barrel wall 26 and it is in its entirety located on the side of the plane through the axes of the bores opposite to the low pressure port 18.
- rotors In the working space 12 are provided two cooperating rotors, viz. a male rotor 28 and a female rotor 30, located with their axes coinciding with the axes of the bores. These rotors are joumaled in the casing 10 in cylindrical roller bearings 32 in the low pressure end wall and in pairs of ball bearings 34 with shoulders in the high pressure end wall 24.
- One rotor is further provided with a stub shaft 36 projecting outside the casing 10.
- the male rotor 28 has five helical lands 38 and intervening grooves 40 having a wrap angle of about 300°.
- the female rotor 30 has six helical lands 42 and intervening grooves 44 having a wrap angle of about 250°.
- a plurality of oil injection channels 54 opening at the intersection line 56 between the two bores forming the working space 12. These channels 54 form communications between an oil supply chamber 58 and the working space 12. Oil is supplied to this chamber from a pressure oil source not shown through a supply opening 60 under a pressure higher than the pressure prevailing in the working space 12 at the openings of the channels 54.
- a standard inlet port 18 is shown where the closing edge 64 thereof on the male rotor side is shaped correspondingly to the leading flank 62 of a male rotor land 38 which means that the groove 40 preceding the land 38 is cut off simultaneously along its complete radial extent.
- Fig.2B an inlet port 18 according to the invention is shown.
- the closing edge on the male rotor side is composed of two sections, an outer one 66 extending over about 2/3 of the radial extent of the port 18 and having a shape corresponding to that of the edge 64 in Fig. 2A and inner portion 68 providing a wedge-shaped extension 70 of the port 18 along the inner periphery thereof.
- extension 70 acts as a by-pass port at low rotor speeds whereas at high rotor speeds the extension 70 will not influence upon the function of the compressor.
- Fig. 3 the variation of the capacity as a function of the rotor speed is shown by a continuous line compared with the corresponding variation when using a standard port shown by a dashed line.
- the torque for driving the rotors with a port according to the invention will be considerably less than that with a standard port.
- Fig. 4 the variation of the torque as a function of the rotor speed is shown by a continuous line compared with the corresponding variation when using a standard port shown by a dashed line.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Applications Or Details Of Rotary Compressors (AREA)
Abstract
Claims (1)
- Compresseur à rotor hélicoïdal relié en rotation à un appareil moteur à vitesse variable et comprenant un corps (10) avec un espace de travail (12), muni d'un cylindre (26) et une paroi d'extrémité à basse pression (22) et à' haute pression (24) et pourvu d'orifices à basse pression (22) et à haute pression (20) espacés l'un de l'autre et disposés, tout au moins partiellement, dans lesdites parois d'extrémité (22, 24) et une paire de rotors mâle (28) et femelle (30) engrenant ayant des parties en relief hélicoïdales extérieures (38, 42) et des rainures (40, 44) disposées dans ledit espace de travail (12), caractérisé en ce que le bord de fermeture (66, 68) de l'orifice axial à basse pression (18), du côté du rotor mâle, a une partie radialement à l'extérieur (66) et une partie radialement à l'intérieur (68), de telle sorte que la partie radialement à l'extérieur (66) suit une courbe correspondant sensiblement à la forme du flanc d'attaque (62) de la partie en relief (38) du rotor mâle et que la partie radialement à l'intérieur (68) fait saillie dans la zone de la paroi à basse pression (22) reliant la phase de compression du compresseur, de manière à former ainsi une encoche en forme de coin (70) s'étendant à l'intérieur de cette zone.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT87904634T ATE49265T1 (de) | 1986-07-08 | 1987-06-26 | Rotierender schraubenverdichter. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB8616596 | 1986-07-08 | ||
GB868616596A GB8616596D0 (en) | 1986-07-08 | 1986-07-08 | Screw rotor compressor |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0276252A1 EP0276252A1 (fr) | 1988-08-03 |
EP0276252B1 true EP0276252B1 (fr) | 1990-01-03 |
Family
ID=10600719
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP87904634A Expired - Lifetime EP0276252B1 (fr) | 1986-07-08 | 1987-06-26 | Compresseur rotatif a vis |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0276252B1 (fr) |
GB (1) | GB8616596D0 (fr) |
WO (1) | WO1988000294A1 (fr) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5246357A (en) * | 1992-07-27 | 1993-09-21 | Westinghouse Electric Corp. | Screw compressor with oil-gas separation means |
US5228301A (en) * | 1992-07-27 | 1993-07-20 | Thermo King Corporation | Methods and apparatus for operating a refrigeration system |
US5857683A (en) * | 1996-04-03 | 1999-01-12 | Carl Clark Auel Living Will | Creeper having lever arms providing variable mechanical advantage for inclining a back portion |
US6705849B2 (en) * | 2002-07-22 | 2004-03-16 | Carrier Corporation | Discharge porting design for screw compressor |
US6821098B2 (en) * | 2003-02-11 | 2004-11-23 | Carrier Corporation | Screw compressor having compression pockets closed for unequal durations |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4435139A (en) * | 1981-02-06 | 1984-03-06 | Svenska Rotor Maskiner Aktiebolag | Screw rotor machine and rotor profile therefor |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2457314A (en) * | 1943-08-12 | 1948-12-28 | Jarvis C Marble | Rotary screw wheel device |
US2474653A (en) * | 1945-04-26 | 1949-06-28 | Jarvis C Marble | Helical gear compressor or motor |
US2642003A (en) * | 1949-12-16 | 1953-06-16 | Read Standard Corp | Blower intake port |
GB966529A (en) * | 1959-09-01 | 1964-08-12 | Svenska Rotor Maskiner Ab | Screw rotor compressor |
US3622256A (en) * | 1969-10-14 | 1971-11-23 | Alexandr Ivanovich Borisoglebs | Screw-rotor machine |
SE428043C (sv) * | 1981-09-15 | 1989-12-14 | Stal Refrigeration Ab | Kompressor med radiellt inlopp till en skruvformig rotor |
SE428312B (sv) * | 1982-09-20 | 1983-06-20 | Svenska Rotor Maskiner Ab | Rotorpar for skruvrotormaskin |
-
1986
- 1986-07-08 GB GB868616596A patent/GB8616596D0/en active Pending
-
1987
- 1987-06-26 WO PCT/SE1987/000305 patent/WO1988000294A1/fr active IP Right Grant
- 1987-06-26 EP EP87904634A patent/EP0276252B1/fr not_active Expired - Lifetime
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4435139A (en) * | 1981-02-06 | 1984-03-06 | Svenska Rotor Maskiner Aktiebolag | Screw rotor machine and rotor profile therefor |
Also Published As
Publication number | Publication date |
---|---|
GB8616596D0 (en) | 1986-08-13 |
WO1988000294A1 (fr) | 1988-01-14 |
EP0276252A1 (fr) | 1988-08-03 |
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