EP0105315A1 - Compressor of hermetical type. - Google Patents
Compressor of hermetical type.Info
- Publication number
- EP0105315A1 EP0105315A1 EP83901250A EP83901250A EP0105315A1 EP 0105315 A1 EP0105315 A1 EP 0105315A1 EP 83901250 A EP83901250 A EP 83901250A EP 83901250 A EP83901250 A EP 83901250A EP 0105315 A1 EP0105315 A1 EP 0105315A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- compressor
- rotor
- motor
- oil
- gear
- 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.)
- Granted
Links
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
- 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
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- 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
- F04C29/02—Lubrication; Lubricant separation
-
- 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
- F04C2240/00—Components
- F04C2240/50—Bearings
- F04C2240/51—Bearings for cantilever assemblies
Definitions
- the invention relates to a compressor of rotational type having an electric driving motor, which compressor comprises a compressor house that encloses a rotor space in which at least one compressor rotor is arranged for sucking a medium into the compressor house through an inlet in the same, to compress the medium and deliver the compressed medium through an outlet in the compressor house to an inlet in a motor chamber which is enclosed in a motor house and in which the driving motor is arranged, and which motor chamber is provided with an outlet for the compressed medium, the compressor house and the motor house being built together to a unit and the rotor of the driving motor driving the compressor rotor via gear wheels, which are arranged on a shaft of respective rotor in a gear space that is arranged separatedly from the rotor space by a wall in which a shaft of the compressor rotor is journalled and lubricated by oil.
- Such a compressor is known by Fig. 2 of the Swedish patent appli cation No 7904608-2 that discloses a compressor of a so called hermetical type in which the compressor and its driving motor are enclosed in a house from which no rotating parts project.
- Such compressors are easy to tighten and are used in those cases when the compressed medium is not allowed to leak out of the compressor.
- the electric driving motor needs cooling and in the known compressor this is brought about by conducting the warm, compressed medium which is sufficiently cold for the cooling of the driving motor through the same.
- the gear wheels are arranged for adapting the number of revolutions of the driving motor to an optimum number of revolutions of the compressor rotors.
- the known compressor has that disadvantage that lubricating points in the compressor require an oil pressure that is higher than the final pressure of the compressed medium, which requires a special oil pump. Examples of such lubricating points are the bearing of the driven screw rotor 16 in the wall towards the motor room 8, and the hearing of the two ends of the motor shaft 2, outside which lubricating points the mentioned final pressure exists and thus the oil has to be supplied with a pressure higher than the mentioned final pressure.
- the object of the invention is to bring about a compressor mentioned by way of introduction, which is constructively simple and where an oil pump for supplying oil to the compressor for lubricating, cooling and tightening purposes can be spared.
- the gear space is arranged separatedly from the motor chamber by a wall in which a shaft of the motor rotor is journailed and lubricated by oil, and besides that the gear space via an outlet is kept under a pressure which is lower than that in the motor chamber such that oil from adjacent bearings of the compressor rotor and motor rotor is sucked into the gear space and from there is removed through the mentioned outlet from the gear space.
- the oil which is mixed with outleaking, gaseous medium can, of course, be sucked away from the gear space to the suction side of the compressor, but hereby the ability of the compressor to suck in medium from outside will be correspondingly deteriorated.
- the outlet from the gear space communicates with a working chamber in the rotor space having a pressure lying between the inlet pressure and the outlet pressure of the compressor.
- the motor rotor with the shaft and gear wheels belonging to it is journalled only in the wall between the motor chamber and the gear space.
- FIG. 1 An embodiment of a compressor according to the invention is disclosed in the accompanying drawing, the figure of which shows a longitudinal section of a screw compressor having two rotors, one of which via a pair of gear wheels is driven by the rotor of an electric motor.
- a compressor house is indicated by 1 and in this house two cooperating, helicoidal rotors 2, 3 are arranged and journalled.
- the rotor 2 is by means of two shaft spindles 4, 5 journalled in radial direction by plain bearings 6, 7 and in axial direction by a rolling bearing 8.
- the rotor 3 is by means of two shaft splndels 9, 10 journalled in radial direction by plain bearings 11, 12 and in axial direction by a rolling bearing 13.
- the compressor house 1 is by means of screws 14 built together with a motor house 15, in which an electric driving motor 16 is arranged.
- the motor 16 comprises a stationary part, the stator 17, and a rotating part, the rotor 18.
- the rotor 18 comprises a shaft 19, which is journalled in the motor house 15 in radial direction by a plain bearing 20 and in axial direction by a rolling bearing 21.
- a gear space 22 into which the shaft spindle 9 and the shaft 19 project and are drivably connected to each other by means of gear wheels 23 and 24, of which the gear wheel 23 is fastened on the shaft spindle 9 and the gear wheel 24 on the shaft 19.
- the compressor rotors 2 and 3 which in a known way form a working chamber 26 between themselves and the compressor house 1, suck a medium into a working chamber through an inlet 25, which medium shall be compressed, whereafter during the rotation of the rotors 2, 3 the working chamber is closed towards the inlet 25.
- the volume of the working chamber is reduced thereafter, the medium being compressed, whereafter the working chamber is opened towards an outlet 27, through which the compressed medium is let out of the compressor house 1.
- the outlet 27 communicates with an inlet 28 of a motor chamber 29 in the motor house 15, in which the driving motor 16 is arranged.
- the compressed medium streams through the motor chamber 29 and cools the driving motor 16, whereafter the compressed medium is delivered via an outlet 30 to an oil separator 31, in which oil is separated from the medium before it is delivered outwards through an outlet 32, for instance to a cooling circuit.
- the rotating parts of the compressor are lubricated, cooled and tightened by oil which is supplied from the oil separator 31 with an initial pressure that is equal to the final pressure of the compressed medium.
- the bearings 7 and 12 are supplied with oil from the oil separator 31 via a line 33, which oil is sucked away from the lower ends of the bearings 7, 12 through a channel 34 and from the upper ends of the bearings 7, 12 through a channel 35.
- the bearings 8 and 13 are supplied with oil during the passage of the oil from the upper ends of the bearings 7, 12 to the channel 35.
- the oil is sucked from the channels 34, 35 together with the medium, that leaks out from the working chambers and is taken care of by the channel 34, into a channel 36 and is sucked therefrom In by an opening 37 of a working chamber 26 having an intermediate pressure, which working chamber 26 neither communicates with the inlet 25 nor with the outlet 27.
- Oil is supplied to the bearings 6 and 11 from the oil separator 31 via a line 38, which oil is sucked away from the upper ends of the bearings 6, 11 through a channel 39 that communicates with the opening 37, which channel 39 also takes care of the medium leaking out from the working chambers 26 of the compressor.
- Oil is supplied to the gear wheels by a nozzle 40, which communicates with the line 38 and which sprays oil onthe teeth of the gear wheels 23, 24 at their tooth engagement.
- Oil is supplied to the bearing 20 by a line 41 ending in two positions 42, 43 along the shaft 19, wherefrom the oil is streaming along the shaft 19 to positions 44, 45, 46 which communicate with the opening 37 via the bearing 21, which is thereby supplied with oil, and the gear chamber 22.
- Oil is supplied to the bearing 20 by a line 41 ending in two positions 42, 43 along the shaft 19, wherefrom the oil is streaming along the shaft 19 to positions 44, 45, 46 which communicate with the opening 37 via the bearing 21, which is thereby supplied with oil, and the gear chamber 22.
- Medium leaking out from the motor chamber 29 along the shaft 19 is via the position 46 directly conducted up into the gear chamber 22 and due to this fact does not jeopardize the lubrication of the shaft 19.
- the compressor rotors 2, 3 are supplied with oil for lubrication, tightening and cooling by a line 47.
- the oil being supplied to the compressor can for instance be cooled by means of a cooler 48 or by spraying refrigerant into the compressor such that due to this fact the final temperature of the compressed medium and therewith the temperature of the oil obtain a suitable low value.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Applications Or Details Of Rotary Compressors (AREA)
Abstract
Un compresseur du type hermétique dans lequel le moteur électrique d'entraînement (16) est enfermé dans une chambre (29), qui est traversée par l'écoulement du milieu comprimé, est entraîné par le moteur d'entraînement au moyen d'un entraînement à engrenages (24, 23) renfermé dans un espace d'engrenages (22) qui est maintenu à une pression intermédiaire dans le compresseur. Grâce à cet agencement, l'entraînement à engrenages (24, 23) et les paliers adjacents (6, 11, 20) sont lubrifiés par l'huile à la pression régnant dans le séparateur d'huile (31) du compresseur, ce qui rend superflue l'utilisation d'une pompe à huile.A hermetic type compressor in which the electric drive motor (16) is enclosed in a chamber (29), which is traversed by the flow of the compressed medium, is driven by the drive motor by means of a drive with gears (24, 23) enclosed in a gear space (22) which is maintained at an intermediate pressure in the compressor. Thanks to this arrangement, the gear drive (24, 23) and the adjacent bearings (6, 11, 20) are lubricated by oil at the pressure prevailing in the oil separator (31) of the compressor, which eliminates the need for an oil pump.
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE8202299 | 1982-04-13 | ||
SE8202299A SE450150B (en) | 1982-04-13 | 1982-04-13 | HERMETIC TYPE COMPRESSOR |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0105315A1 true EP0105315A1 (en) | 1984-04-18 |
EP0105315B1 EP0105315B1 (en) | 1987-01-07 |
Family
ID=20346519
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP83901250A Expired EP0105315B1 (en) | 1982-04-13 | 1983-03-31 | Compressor of hermetical type |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0105315B1 (en) |
JP (1) | JPS59500572A (en) |
DE (1) | DE3368965D1 (en) |
SE (1) | SE450150B (en) |
WO (1) | WO1983003641A1 (en) |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
SE462232B (en) * | 1988-11-16 | 1990-05-21 | Svenska Rotor Maskiner Ab | SCREW COMPRESSOR WITH OIL DRAINAGE |
US4957417A (en) * | 1989-07-14 | 1990-09-18 | Kabushiki Kaisha Kobe Seiko Sho | Vertical oilless screw vacuum pump |
EP0758054B1 (en) * | 1995-08-09 | 2001-03-07 | SULZER-ESCHER WYSS GmbH | Oil circulation system for screw compressors |
BE1014642A3 (en) * | 2002-02-14 | 2004-02-03 | Atlas Copco Airpower Nv | Oil injected screw compressor component, has second groove provided in rotor shaft to improve rotor shaft bearing lubrication |
CN100387843C (en) * | 2003-12-22 | 2008-05-14 | 三菱电机株式会社 | Scroll compressor |
BE1016581A3 (en) * | 2005-02-22 | 2007-02-06 | Atlas Copco Airpower Nv | IMPROVED WATER INJECTED SCREW COMPRESSOR ELEMENT. |
BE1025222B1 (en) * | 2017-05-04 | 2018-12-13 | Atlas Copco Airpower Naamloze Vennootschap | Transmission and compressor or vacuum pump provided with such transmission |
BE1026195B1 (en) * | 2018-04-11 | 2019-11-12 | Atlas Copco Airpower Naamloze Vennootschap | Liquid injected compressor device |
JP7229720B2 (en) * | 2018-10-26 | 2023-02-28 | 株式会社日立産機システム | screw compressor |
BE1028274B1 (en) | 2020-05-07 | 2021-12-07 | Atlas Copco Airpower Nv | Compressor element with improved oil injector |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1696882A (en) * | 1925-12-16 | 1928-12-25 | Connersville Blower Co | Blower |
US2654530A (en) * | 1949-08-05 | 1953-10-06 | Eaton Mfg Co | Supercharger |
SE369097B (en) * | 1972-09-25 | 1974-08-05 | Stal Refrigeration Ab | |
FR2401338B1 (en) * | 1977-06-17 | 1980-03-14 | Cit Alcatel | |
SE422350B (en) * | 1978-04-20 | 1982-03-01 | Stal Refrigeration Ab | DRAINAGE OF A FLUID OF COMPRESSED MEDIUM THAT STRETCHES TO LEAK OUT THE LONG AXLE OF A ROTOR IN A ROTAION TYPE COMPRESSOR |
DD136758A1 (en) * | 1978-05-29 | 1979-07-25 | Alexander Pietsch | HERMETIC ENGINE COMPRESSOR UNIT WITH SCREW COMPRESSOR |
SE455719B (en) * | 1979-09-24 | 1988-08-01 | Isartaler Schraubenkompressor | COMPRESSOR SYSTEM WITH A SCRAP COMPRESSOR |
DE2948992A1 (en) * | 1979-12-05 | 1981-06-11 | Karl Prof.Dr.-Ing. 3000 Hannover Bammert | ROTOR COMPRESSORS, ESPECIALLY SCREW ROTOR COMPRESSORS, WITH LUBRICANT SUPPLY TO AND LUBRICANT DRAINAGE FROM THE BEARINGS |
-
1982
- 1982-04-13 SE SE8202299A patent/SE450150B/en not_active IP Right Cessation
-
1983
- 1983-03-31 EP EP83901250A patent/EP0105315B1/en not_active Expired
- 1983-03-31 DE DE8383901250T patent/DE3368965D1/en not_active Expired
- 1983-03-31 WO PCT/SE1983/000126 patent/WO1983003641A1/en active IP Right Grant
- 1983-03-31 JP JP50129983A patent/JPS59500572A/en active Granted
Non-Patent Citations (1)
Title |
---|
See references of WO8303641A1 * |
Also Published As
Publication number | Publication date |
---|---|
JPH056037B2 (en) | 1993-01-25 |
DE3368965D1 (en) | 1987-02-12 |
SE450150B (en) | 1987-06-09 |
EP0105315B1 (en) | 1987-01-07 |
WO1983003641A1 (en) | 1983-10-27 |
SE8202299L (en) | 1983-10-14 |
JPS59500572A (en) | 1984-04-05 |
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Legal Events
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