EP0105315B1 - Compressor of hermetical type - Google Patents

Compressor of hermetical type Download PDF

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Publication number
EP0105315B1
EP0105315B1 EP83901250A EP83901250A EP0105315B1 EP 0105315 B1 EP0105315 B1 EP 0105315B1 EP 83901250 A EP83901250 A EP 83901250A EP 83901250 A EP83901250 A EP 83901250A EP 0105315 B1 EP0105315 B1 EP 0105315B1
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.)
Expired
Application number
EP83901250A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0105315A1 (en
Inventor
Rune Glanvall
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Stal Refrigeration AB
Original Assignee
Stal Refrigeration AB
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Stal Refrigeration AB filed Critical Stal Refrigeration AB
Publication of EP0105315A1 publication Critical patent/EP0105315A1/en
Application granted granted Critical
Publication of EP0105315B1 publication Critical patent/EP0105315B1/en
Expired legal-status Critical Current

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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
    • 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 hermetical compressor of rotational type according to the introductory part of claim 1.
  • a hermetical compressor of rotational type is known from Figure 2 of the DE-A-2 914 726.
  • the compressor disclosed in the DE-A-2914726 is of a so called hermetical type in which the compressor and its driving motor are enclosed in a housing from which no rotating parts project. Such compressors are easy to tighten and are used in those cases in which 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 cooling 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 bearing 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.
  • an open-air com- p ressor is known, the driving motor of which is connected via gear wheels to the shaft of one of two screw-shaped compressor rotors meshing with one another.
  • the driving motor is surrounded by the open air and sucks in the air to be compressed with the help of a fan.
  • This compressor unit is of a special compact design, incorporating in one constructional unit an air filter, an oil separator and a cooler for the compressed air.
  • the gear wheels between compressor and driving motor are housed in a chamber that is closed towards the open air and thereby towards the driving motor.
  • This gear chamber is supplied with lubricating oil via a pipe opening into the gear chamber, and the gear chamber is connected via a second pipe to a compartment of the pressure chamber in which the pressure is lower than in the gear chamber.
  • the bearings on the pressure side of the compressor rotors are lubricated by oil, being injected at an intermediate point between the inlet and the outlet of the compressor and being squeeezed through the bearings whereupon the oil is led back to the pressureless outside of one of the rotors.
  • a compressor where lubrication of the rotor bearings is achieved by feeding oil at output pressure of the compressor to grooves surrounding the bearings and by discharging the oil after being squeezed through the bearing surfaces via a pipe to a point in the compressor chamber positioned between the inlet and the outlet of the compressor.
  • the invention aims at developing a hermetical compressor of the above-mentioned kind, 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 invention suggests a hermetical compressor according to the introductory part of claim 1, which is characterized by the features of the characterizing part of claim 1.
  • oil having an initial pressure equal to the final pressure of the compressed medium, i.e. equal to the pressure in the motor chamber, is forced to circulate through the shaft bearings being adjacent to the gear chamber, and through the gear chamber and lubricate and cool the mentioned shaft bearings and the gear wheels in the gear chamber.
  • 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 drawings, 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 spindels 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 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 on the 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 by 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)
EP83901250A 1982-04-13 1983-03-31 Compressor of hermetical type Expired EP0105315B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8202299 1982-04-13
SE8202299A SE450150B (sv) 1982-04-13 1982-04-13 Kompressor av hermetisk typ

Publications (2)

Publication Number Publication Date
EP0105315A1 EP0105315A1 (en) 1984-04-18
EP0105315B1 true 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 (enrdf_load_stackoverflow)
JP (1) JPS59500572A (enrdf_load_stackoverflow)
DE (1) DE3368965D1 (enrdf_load_stackoverflow)
SE (1) SE450150B (enrdf_load_stackoverflow)
WO (1) WO1983003641A1 (enrdf_load_stackoverflow)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE462232B (sv) * 1988-11-16 1990-05-21 Svenska Rotor Maskiner Ab Skruvkompressor med oljedraenering
US4957417A (en) * 1989-07-14 1990-09-18 Kabushiki Kaisha Kobe Seiko Sho Vertical oilless screw vacuum pump
DE59509083D1 (de) * 1995-08-09 2001-04-12 Escher Wyss Gmbh Schmiersystem für Schraubenverdichtern
BE1014642A3 (nl) * 2002-02-14 2004-02-03 Atlas Copco Airpower Nv Oliegeinjecteerd schroefcompressorelement.
US20060182647A1 (en) * 2003-12-22 2006-08-17 Masaaki Kamikawa Screw compressor
BE1016581A3 (nl) * 2005-02-22 2007-02-06 Atlas Copco Airpower Nv Verbeterd watergeinjecteerd schroefcompressorelement.
BE1025276B1 (nl) * 2017-05-04 2019-01-07 Atlas Copco Airpower Naamloze Vennootschap Overbrenging en compressor of vacuümpomp voorzien van dergelijke overbrenging
BE1026195B1 (nl) * 2018-04-11 2019-11-12 Atlas Copco Airpower Naamloze Vennootschap Vloeistof geïnjecteerde compressorinrichting
JP7229720B2 (ja) * 2018-10-26 2023-02-28 株式会社日立産機システム スクリュー圧縮機
BE1028274B1 (nl) 2020-05-07 2021-12-07 Atlas Copco Airpower Nv Compressorelement met verbeterede olie-injector

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2914726A1 (de) * 1978-05-29 1979-12-06 Luft U Kaeltetechnik Veb K Hermetische motorverdichtereinheit mit schraubenverdichter

Family Cites Families (7)

* Cited by examiner, † Cited by third party
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 (enrdf_load_stackoverflow) * 1972-09-25 1974-08-05 Stal Refrigeration Ab
FR2401338B1 (enrdf_load_stackoverflow) * 1977-06-17 1980-03-14 Cit Alcatel
SE422350B (sv) * 1978-04-20 1982-03-01 Stal Refrigeration Ab Drenering av ett flode av komprimerat medium som strevar efter att lecka ut lengs axeln hos en rotor i en kompressor av rotaionstyp
SE455719B (sv) * 1979-09-24 1988-08-01 Isartaler Schraubenkompressor Kompressoranleggning med en i ett holje anordnad skruvkompressor
DE2948992A1 (de) * 1979-12-05 1981-06-11 Karl Prof.Dr.-Ing. 3000 Hannover Bammert Rotorverdichter, insbesondere schraubenrotorverdichter, mit schmiermittelzufuhr zu und schmiermitteldrainage von den lagern

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2914726A1 (de) * 1978-05-29 1979-12-06 Luft U Kaeltetechnik Veb K Hermetische motorverdichtereinheit mit schraubenverdichter

Also Published As

Publication number Publication date
SE8202299L (sv) 1983-10-14
SE450150B (sv) 1987-06-09
JPS59500572A (ja) 1984-04-05
JPH056037B2 (enrdf_load_stackoverflow) 1993-01-25
EP0105315A1 (en) 1984-04-18
DE3368965D1 (en) 1987-02-12
WO1983003641A1 (en) 1983-10-27

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