US3790315A - Rotary piston compressors with liquid injection - Google Patents

Rotary piston compressors with liquid injection Download PDF

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Publication number
US3790315A
US3790315A US00184520A US3790315DA US3790315A US 3790315 A US3790315 A US 3790315A US 00184520 A US00184520 A US 00184520A US 3790315D A US3790315D A US 3790315DA US 3790315 A US3790315 A US 3790315A
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US
United States
Prior art keywords
rotor
hub
gate rotor
tooth
compressor
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Expired - Lifetime
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US00184520A
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English (en)
Inventor
K Emanuelsson
B Arnegard
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Atlas Copco AB
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Atlas Copco AB
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Publication date
Application filed by Atlas Copco AB filed Critical Atlas Copco AB
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Publication of US3790315A publication Critical patent/US3790315A/en
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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
    • F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
    • F04C29/0007—Injection of a fluid in the working chamber for sealing, cooling and lubricating
    • 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
    • F04C18/123—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 radially or approximately radially from the rotor body extending tooth-like elements, co-operating with recesses in the other rotor, e.g. one tooth

Definitions

  • Each rotor has a hub with a substantially constant radius hub portion and with a tooth extending radially from said portion and with a recess for passage of the tooth of the cooperating rotor.
  • the casing provides end walls for the bores with axial inlet and outlet ports for the working fluid.
  • Injection nozzles or fine openings for liquid serving as sealant and for cooling the working fluid are provided in the end walls of the gate rotor bores in such position, that they are covered by the constant radius portion of the gate rotor hub at the beginning of the compression cycle and are uncovered in the recess of said hub towards the end of the compression cycle.
  • This invention relates to a rotary piston compressor having a main rotor and a gate rotor provided each per se with a hub having a hubportion with substantially constant radius and with a tooth extending radially from said hub portion, said hub on the main rotor having a recess adjacent the main rotor tooth for the passage of the gate rotor tooth, said hub on the gate rotor having a recess adjacent the gate rotor tooth for the passage of the main rotor tooth, and said compressor having a casing with intersecting cylindrical bores, one for each rotor, said rotors being mounted for rotation in said casing and arranged to sealingly cooperate one with the other and with the casing for transportation of limited volumes of a working fluid through the compressor under simultaneous reduction of the size of said volumes, and said machine having axial inlet and outlet ports for the working fluid and means for synchronizing the rotation of the rotors.
  • One object of the invention is to provide means for liquid injection in compressors of this type which are of simple construction and such design that the injected liquid effectively serves to seal the leakage through the clearances in the compressor and furthermore coolsthe working fluid during the compression cycle.
  • a further object of the invention is to cool the working fluid in the portions of the compressor where the greatest heat generation occurs.
  • a still further object of the invention is to increase the efficiency of the compressor and to make possible compression to a high pressure
  • FIG. 1 is a section through a rotary piston compressors on a plane through the two axes of the compressor.
  • FIG. 2 a transverse section of the compressor on lines ll-II in FIG. 1'.
  • the rotary piston compressor illustrated in FIGS. 1 and 2 is a one or single stage toothed compressor provided with a main rotor and a gate rotor each provided with a single tooth.
  • the compressor casing of the machine consists of a central portion 1 and two end wall pro tions 2, 3 which are bolted together with the central portion 1 by means of bolts 4.
  • Two cylindrical bores 5, 6 with parallel axes are formed in the portion 1 which bores partially intersect.
  • the bores 5, 6 form working chambers for a main rotor 7 and a gate rotor 8 which rotors are secured on parallel shafts 9 and 10, respectively, preferably secured by shrinking or pressure fitting or they may be made integral with the shafts.
  • the shafts 9 and 10 are mounted in bearings 11a and 11b, respectively, fitted in the wall portions 2, ,3.
  • the bearings 11a are cylindrical roller bearings which permit axial displacement of the shafts whereas the bearings 1117 are angle contact ball bearings which fix the shafts with respect to the position where the bearings 11b are fixed.
  • the rotors are synchronized by means of a toothed gear transmission 12 and sealed against the working chambers in the central portion 1 of the compressor casing by sealing rings. 13, which form seals with bushings 13a which preferably may be press fitted on the shafts 9 and 10, respectively.
  • the bushings 13a also function as spacer sleeves.
  • the compressor casing is provided with an inlet pipe socket 14 which is formed partly in the central portion l'and partly in the end wall portions 2 and 3, and, furthermore, with an outlet pipe socket 15 formed in the end wall portions 2, 3.
  • the inlet pipe socket 14 forms a passage 18 to inlet ports leading to the working chamber of the machine which inlet ports comprise a radial inlet port portion 19 and two axial inlet port portions 20 one in each end wall portion 2 and 3, respectivelyQ
  • the outlet pipe socket 15 is connected to outlet ports 22 by means of outlet passages 21 one in each end wall portion 2 and 3, respectively.
  • the central portion 1 of the compressor casing is at one side of a plane 10a through the rotor axes provided with a cooling jacket 16 which together with the cylinder wall 17 forms the cooling passage 23 for cooling liquid, such as cooling 'oil, which is preferably supplied through an inlet opening 24 and expelled through an outlet opening 25 at the under side and the upper side, respectively, of the compressor casing.
  • the end wall portions 2, 3 are provided with passages 26 and 27, respectively, which constitute drain passages to the outside of the compressor for working fluid which may leak fluid from the working chambers in the central portion 1 of the compressor over the seals 13 and 13a.
  • the wall thickness may consequently be reduced and the casing as a whole may be designed lighter which also promotes more efficient cooling.
  • the cooling means 16, 23 may sometimes be replaced by air cooling means.
  • guide pins 28 are provided in the central portion 1 which guide pins fit in carefully machined holes 29 in the end wall portions 2, 3. Two or three such holes may be provided at suitable positions around the bores 5, 6.
  • the end wall portion 2 is provided with a flange 30 arranged for securing the compressor to a suitable driving motor which drives the compressor over a toothed gear 31 which is secured on the rotor shaft 9 by means of a pressure disk 32 and bolts 33 and a pair of conic'al spanner rings 34.
  • the outer races of the angle contact ball bearings 1112 are secured in sleeve portions 35 which are formedin the 3 end wall portions 3 and which are made elastic by the provision of radial slots 36 which also serve as oil drainage passages and extend along a portion of the periphery of the sleeve portion 35.
  • the sleeve portions 35 are also provided with axial slots 37 which are bridged by spanner bolts 38 serving to secure the outer races of the bearings 1 lb. 39 indicate oil throwing rings which also serve as puller rings for the bearings 11b. 40 indicate drain passages.
  • 41 is a pressure disk and 42 bolts for securing the synchronizing gears 12 to the shafts in adjusted positions by means ofpairs of conical spanner rings 34.
  • 43 is a cover for the synchronizing transmission which is secured by a spanner 44 and which is sealed against the end wall portion 3 by means of a sealing ring 45 so that oil is prevented from leaking from the transmission housing.
  • the compressor is provided with means for the injection of cooling liquid in the clearances between the end walls and the hub portion with substantially constant radius of the gate rotor and through the recess in the gate rotor hub, respectively. Furthermore injection may also take place according to the demand in other parts of the working chambers of the compressor.
  • the cooling liquid may, for instance, be oil or water, which for the purpose of internal cooling of the compressor takes up the major portion of the heat generated by compression from the working fluid.
  • the quantity and temperature of the cooling liquid must, of course, have a certain relation to the quantity and pressure of the working fluid and the physical properties of said fluid, which every heat technician can easily calculate.
  • the cooling liquid also serves to seal the clearances of the compressor, and, if it has lubricating properties, it may also help to lubricate the compressor. 1
  • Cooling liquid may also be injected in well known manner through nozzles 46 with openings 47 directed towards the working chamber of the main rotor.
  • a further means for injecting cooling liquid may comprise a number of fine nozzles or holes 48 in the end walls 2, 3 of the working chamber of the main rotor tooth 49, so arranged that they are never covered by the hub portion 50 with substantially constant radius of the main rotor.
  • Said means may preferably be disposed in the portion of the working chamber of the main rotor adjacent the outlet port 22.
  • injection nozzles or holes are arranged in the end walls 2, 3 as indicated at 51, which are so disposed that they are covered during a portion of a gate rotor revolution by the gate rotor hub portion with substantially constant radius which is in the beginning of the compression cycle but are uncovered in the hub recess 53 during a later portion of the gate rotor revolution towards the end of the compression cycle.
  • a preferable axial sealing effect is obtained between the gate rotor hub and the end walls during a great part of the gate rotor revolution when the pressure drop over the clearance is large and an efficient cooling is obtained during the last part of the compression cycle when the pressure drop is smaller.
  • the nozzles 51 are arranged in the half of the working chamber of the gate r'otor which is adjacent the outlet opening 22.
  • a further cooling liquid injection means may comprise nozzles or holes 57, 58 in the peripheral walls of the bores 5, 6.
  • the holes 57, 58 may lead from the cooling medium jacket 23 or from separate not illustrated conduits for injections of cooling liquid.
  • All cooling liquid nozzles or openings may be fed from a non illustrated pump in a manner well known in oil injected compressors an'dthe cooling liquid may be separated from the working fluid in a separator provided after the compressor in known manner. The separated cooling liquid may be cooled for renewed use in the compressor. Cooling liquid injected according to the invention in the gate rotor end wall clearances may be helpful to keep the rotor in correct axial position between the end walls 2, 3.
  • the illustrated compressor has a compression clearance space which gradually goes down to Zero and, in order to avoid liquid shocks in the compressor at the end of the compression cycle, it may sometimes be preferred to chamfer or round off a portion 55 of the concave gate rotor tooth flank near the base of the tooth, which has been illustrated very exaggerated in FIG. 2 atthe leading flank 56 of the gate rotor tooth 54. Passages in the gate rotor ends or the end walls 2, 3 may also serve to drain out small trapped gas and/or liquid quantities to the inlet port for avoiding liquid or working fluid shocks.
  • a rotary piston compressor with liquid injection comprising a main rotor and a gate rotor provided each per se with a hub having a hub portion with substantially constant radius and with a tooth extending radially from said hub portion, said hub of the main rotor having a recess adjacent the main rotor tooth for the passage of the gate rotor tooth, said hub of the gate rotor having a recess adjacent the gate rotor tooth for the passage of the main rotor tooth, and said compressor having a casing with intersecting cylindrical bores, one for each rotor, and end walls bounding said bores axially, said rotors being mounted for rotation in said casing and arranged to sealingly cooperate one with the other and with the casing for transportation of limited volumes of a working fluid through the compressor under simultaneous reduction of the size of said volumes, and axial inlet and outlet ports in said end walls for the working fluid and means in said compressor for synchronizing the rotation of the rotors, said compressor being characterized by the provision of injection nozzles
  • a rotary piston compressor according to claim 1 in which the liquid injection nozzles in the end wall of the gate rotor bore are situated in the half of the end wall containing the outlet port.
  • a rotary piston compressor according to claim 1 4.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)
  • Rotary Pumps (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
US00184520A 1970-10-01 1971-09-28 Rotary piston compressors with liquid injection Expired - Lifetime US3790315A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE13310/70A SE351012B (fr) 1970-10-01 1970-10-01

Publications (1)

Publication Number Publication Date
US3790315A true US3790315A (en) 1974-02-05

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ID=20297194

Family Applications (1)

Application Number Title Priority Date Filing Date
US00184520A Expired - Lifetime US3790315A (en) 1970-10-01 1971-09-28 Rotary piston compressors with liquid injection

Country Status (4)

Country Link
US (1) US3790315A (fr)
FR (1) FR2109798A5 (fr)
GB (2) GB1365564A (fr)
SE (1) SE351012B (fr)

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4137019A (en) * 1976-02-06 1979-01-30 Rudolf Hofmann Rotary piston machine
US5149256A (en) * 1990-05-05 1992-09-22 The Drum Engineering Company Limited Rotary, positive displacement machine with specific lobed rotor profile
US20040242435A1 (en) * 2003-05-29 2004-12-02 Nissan Motor Co., Ltd. Hard-carbon coated machine tool and cutting oil composition therefor
US20050005892A1 (en) * 2003-05-23 2005-01-13 Nissan Motor Co., Ltd. Piston for internal combustion engine
US20050025975A1 (en) * 2003-07-31 2005-02-03 Nissan Motor Co., Ltd. Gear
US20050035222A1 (en) * 2003-04-15 2005-02-17 Nissan Motor Co., Ltd. Fuel injection valve
US20050037879A1 (en) * 2003-08-13 2005-02-17 Nissan Motor Co., Ltd. Chain drive system
EP1510692A1 (fr) 2003-08-21 2005-03-02 Nissan Motor Company, Limited Compresseur à réfrigération et procédé de régulation de sa friction
US20050064196A1 (en) * 2003-08-21 2005-03-24 Jean Martin Low-friction sliding member and low-friction sliding mechanism using same
US20050100701A1 (en) * 2003-08-08 2005-05-12 Nissan Motor Co., Ltd. Sliding member and production process thereof
US20050118426A1 (en) * 1999-04-09 2005-06-02 Shojiro Miyake Slidably movable member and method of producing same
US20060263604A1 (en) * 2003-08-06 2006-11-23 Martin Jean M Low-friction sliding mechanism, low-friction agent composition and method of friction reduction
US7146956B2 (en) 2003-08-08 2006-12-12 Nissan Motor Co., Ltd. Valve train for internal combustion engine
US7228786B2 (en) 2003-06-06 2007-06-12 Nissan Motor Co., Ltd. Engine piston-pin sliding structure
US7255083B2 (en) 2002-10-16 2007-08-14 Nissan Motor Co., Ltd. Sliding structure for automotive engine
US7284525B2 (en) 2003-08-13 2007-10-23 Nissan Motor Co., Ltd. Structure for connecting piston to crankshaft
US7318514B2 (en) 2003-08-22 2008-01-15 Nissan Motor Co., Ltd. Low-friction sliding member in transmission, and transmission oil therefor
US7322749B2 (en) 2002-11-06 2008-01-29 Nissan Motor Co., Ltd. Low-friction sliding mechanism
US7427162B2 (en) 2003-05-27 2008-09-23 Nissan Motor Co., Ltd. Rolling element
CN102251960A (zh) * 2010-05-17 2011-11-23 泰悉尔公司 具有现场整修构造的螺杆泵
US20150110433A1 (en) * 2013-10-18 2015-04-23 Eudes Borchardt Sealing And Bearing Unit For At Least Two Shafts Orientated In Parallel With One Another And Method For Separating A Sealing And Bearing Unit From At Least Two Shafts Orientated In Parallel With One Another
US20180106255A1 (en) * 2010-08-30 2018-04-19 Hicor Technologies, Inc. Compressor with liquid injection cooling

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0370117B1 (fr) * 1988-10-24 1994-01-12 Leybold Aktiengesellschaft Pompe à vide avec deux arbres et méthode de fonctionnement
EP0365695B1 (fr) * 1988-10-24 1992-11-25 Leybold Aktiengesellschaft Pompe à vide à déplacement positif avec deux arbres
GB8825284D0 (en) 1988-10-28 1988-11-30 Boc Group Plc Improvements in mechanical pumps
GB2557681A (en) * 2016-12-15 2018-06-27 Edwards Ltd A claw pump and method of operation

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1953253A (en) * 1931-03-04 1934-04-03 Ogilvie Henry Rotary compressor or pump
US2455297A (en) * 1943-02-13 1948-11-30 Thompson Prod Inc Sliding vane air pump lubrication
US3535060A (en) * 1969-03-21 1970-10-20 Arthur E Brown Rotary displacement machines
US3610787A (en) * 1970-03-10 1971-10-05 Alexandr Ivanovich Borisoglebs Rotary screw machine

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1953253A (en) * 1931-03-04 1934-04-03 Ogilvie Henry Rotary compressor or pump
US2455297A (en) * 1943-02-13 1948-11-30 Thompson Prod Inc Sliding vane air pump lubrication
US3535060A (en) * 1969-03-21 1970-10-20 Arthur E Brown Rotary displacement machines
US3610787A (en) * 1970-03-10 1971-10-05 Alexandr Ivanovich Borisoglebs Rotary screw machine

Cited By (41)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4137019A (en) * 1976-02-06 1979-01-30 Rudolf Hofmann Rotary piston machine
US5149256A (en) * 1990-05-05 1992-09-22 The Drum Engineering Company Limited Rotary, positive displacement machine with specific lobed rotor profile
US7273655B2 (en) 1999-04-09 2007-09-25 Shojiro Miyake Slidably movable member and method of producing same
US20050118426A1 (en) * 1999-04-09 2005-06-02 Shojiro Miyake Slidably movable member and method of producing same
US7255083B2 (en) 2002-10-16 2007-08-14 Nissan Motor Co., Ltd. Sliding structure for automotive engine
US20110028361A1 (en) * 2002-11-06 2011-02-03 Nissan Motor Co., Ltd. Low-friction sliding mechanism
US7322749B2 (en) 2002-11-06 2008-01-29 Nissan Motor Co., Ltd. Low-friction sliding mechanism
US8152377B2 (en) 2002-11-06 2012-04-10 Nissan Motor Co., Ltd. Low-friction sliding mechanism
US20050035222A1 (en) * 2003-04-15 2005-02-17 Nissan Motor Co., Ltd. Fuel injection valve
US7500472B2 (en) 2003-04-15 2009-03-10 Nissan Motor Co., Ltd. Fuel injection valve
US20050005892A1 (en) * 2003-05-23 2005-01-13 Nissan Motor Co., Ltd. Piston for internal combustion engine
US7406940B2 (en) 2003-05-23 2008-08-05 Nissan Motor Co., Ltd. Piston for internal combustion engine
US7427162B2 (en) 2003-05-27 2008-09-23 Nissan Motor Co., Ltd. Rolling element
US20040242435A1 (en) * 2003-05-29 2004-12-02 Nissan Motor Co., Ltd. Hard-carbon coated machine tool and cutting oil composition therefor
US7228786B2 (en) 2003-06-06 2007-06-12 Nissan Motor Co., Ltd. Engine piston-pin sliding structure
US8096205B2 (en) 2003-07-31 2012-01-17 Nissan Motor Co., Ltd. Gear
US20050025975A1 (en) * 2003-07-31 2005-02-03 Nissan Motor Co., Ltd. Gear
US20080276755A1 (en) * 2003-07-31 2008-11-13 Nissan Motor Co., Ltd. Gear
US8206035B2 (en) 2003-08-06 2012-06-26 Nissan Motor Co., Ltd. Low-friction sliding mechanism, low-friction agent composition and method of friction reduction
US20060263604A1 (en) * 2003-08-06 2006-11-23 Martin Jean M Low-friction sliding mechanism, low-friction agent composition and method of friction reduction
US20050100701A1 (en) * 2003-08-08 2005-05-12 Nissan Motor Co., Ltd. Sliding member and production process thereof
US8575076B2 (en) 2003-08-08 2013-11-05 Nissan Motor Co., Ltd. Sliding member and production process thereof
US20090054277A1 (en) * 2003-08-08 2009-02-26 Nissan Motor Co., Ltd. Sliding member and production process thereof
US7458585B2 (en) 2003-08-08 2008-12-02 Nissan Motor Co., Ltd. Sliding member and production process thereof
US7146956B2 (en) 2003-08-08 2006-12-12 Nissan Motor Co., Ltd. Valve train for internal combustion engine
US7284525B2 (en) 2003-08-13 2007-10-23 Nissan Motor Co., Ltd. Structure for connecting piston to crankshaft
US7572200B2 (en) 2003-08-13 2009-08-11 Nissan Motor Co., Ltd. Chain drive system
US20050037879A1 (en) * 2003-08-13 2005-02-17 Nissan Motor Co., Ltd. Chain drive system
US20050064196A1 (en) * 2003-08-21 2005-03-24 Jean Martin Low-friction sliding member and low-friction sliding mechanism using same
US7134381B2 (en) 2003-08-21 2006-11-14 Nissan Motor Co., Ltd. Refrigerant compressor and friction control process therefor
US7771821B2 (en) 2003-08-21 2010-08-10 Nissan Motor Co., Ltd. Low-friction sliding member and low-friction sliding mechanism using same
US20050084390A1 (en) * 2003-08-21 2005-04-21 Nissan Motor Co., Ltd. Refrigerant compressor and friction control process therefor
EP1510692A1 (fr) 2003-08-21 2005-03-02 Nissan Motor Company, Limited Compresseur à réfrigération et procédé de régulation de sa friction
US7650976B2 (en) 2003-08-22 2010-01-26 Nissan Motor Co., Ltd. Low-friction sliding member in transmission, and transmission oil therefor
US20080236984A1 (en) * 2003-08-22 2008-10-02 Nissan Motor Co., Ltd. Low-friction sliding member in transmission, and transmission oil therefor
US7318514B2 (en) 2003-08-22 2008-01-15 Nissan Motor Co., Ltd. Low-friction sliding member in transmission, and transmission oil therefor
CN102251960A (zh) * 2010-05-17 2011-11-23 泰悉尔公司 具有现场整修构造的螺杆泵
US20180106255A1 (en) * 2010-08-30 2018-04-19 Hicor Technologies, Inc. Compressor with liquid injection cooling
US10962012B2 (en) * 2010-08-30 2021-03-30 Hicor Technologies, Inc. Compressor with liquid injection cooling
US20150110433A1 (en) * 2013-10-18 2015-04-23 Eudes Borchardt Sealing And Bearing Unit For At Least Two Shafts Orientated In Parallel With One Another And Method For Separating A Sealing And Bearing Unit From At Least Two Shafts Orientated In Parallel With One Another
US9422985B2 (en) * 2013-10-18 2016-08-23 Netzsch Pumpen & Systeme Gmbh Sealing and bearing unit for at least two shafts orientated in parallel with one another and method for separating a sealing and bearing unit from at least two shafts orientated in parallel with one another

Also Published As

Publication number Publication date
GB1365564A (en) 1974-09-04
SE351012B (fr) 1972-11-13
GB1365563A (en) 1974-09-04
FR2109798A5 (fr) 1972-05-26

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