ClassID:

143659

F04C27/009 - CPC Classification

Classification description:

Sealing arrangements in rotary-piston pumps specially adapted for elastic fluids for other than working fluid, i.e. the sealing arrangements are not between working chambers of the machine Shaft sealings specially adapted for pumps

Recent Application in this class:
#1
20250389272
2025-12-25

SCREW COMPRESSOR WITH MULTI-LAYERED COATING OF THE ROTOR SCREWS

#2
20250180020
2025-06-05

Mechanical Seal Assembly with Double-Sealing Properties and Low Pressure Area

#3
20250146490
2025-05-08

Parallel connected multiple shaft roots vacuum pump

#4
20240309869
2024-09-19

SCREW COMPRESSOR WITH MULTI-LAYERED COATING OF THE ROTOR SCREWS

#5
20240102471
2024-03-28

UNIVERSAL PUMP BRACKET

#6
20230407868
2023-12-21

Mechanical seal assembly with double-sealing properties and low pressure area

#7
20230392599
2023-12-07

MOTOR-DRIVEN SCROLL ELECTRIC COMPRESSOR

#8
20230323879
2023-10-12

VACUUM PUMP

#9
20230258180
2023-08-17

Screw compressor with multi-layered coating of the rotor screws

#10
20230228268
2023-07-20

COMPRESSOR

#11
20230212976
2023-07-06

SUPERCHARGER

#12
20230184251
2023-06-15

Scroll pump with a plurality of bellows sealing a plurality of adjustment members

#13
20230175511
2023-06-08

Damping system for compressor

#14
20230013325
2023-01-19

Device for recirculating an at least partially gaseous composition containing hydrogen and fuel cell system

#15
20220186728
2022-06-16

Electric pump

#16
20220170462
2022-06-02

Liquid cooling of a scroll type compressor with liquid supply through the crankshaft

#17
20220120279
2022-04-21

ROUGH-VACUUM PUMP OF DRY TYPE

#18
20220003234
2022-01-06

Oil-free water-injected screw air compressor

#19
20210404470
2021-12-30

Axial pressure relief in slide bearings of pumps

#20
20210396230
2021-12-23

High suction pressure single screw compressor with thrust balancing load using shaft seal pressure and related methods

#21
20210396229
2021-12-23

Positive displacement machine with kinematic synchronization coupling and with driven moving parts having their own individual drives

#22
20210108638
2021-04-15

Dry vacuum pump with a pressure variation reducing expansion device between a pumping side volume and an oil sump

#23
20210071669
2021-03-11

Scroll type device having liquid cooling through idler shafts

#24
20210054843
2021-02-25

Dry vacuum pump with at least one sealing device with a deflector

#25
20210048026
2021-02-18

Method of priming a pump of an aircraft engine

#26
20200378385
2020-12-03

Screw compressor having a different pressure of the fluid applied to the seal ring on the delivery side shaft sealing unit

#27
20200256338
2020-08-13

Sealing device for oil injection-type screw compressor

#28
20200248691
2020-08-06

SCROLL COMPRESSOR

#29
20200240411
2020-07-30

Screw compressor with multi-layered coating of the rotor screws

#30
20200141410
2020-05-07

Liquid ring vacuum pump

#31
20200102881
2020-04-02

Supercharger

#32
20200025204
2020-01-23

Orbiting scroll device lubrication

#33
20190368489
2019-12-05

Pump assembly with sealing protrusion on stator bore portion

#34
20190316584
2019-10-17

Compressor having bushing

#35
20190277282
2019-09-12

Vacuum pump sealing element

#36
20190195226
2019-06-27

High suction pressure single screw compressor with thrust balancing load using shaft seal pressure and related methods

#37
20190107109
2019-04-11

Oil-free screw compressor

#38
20190072093
2019-03-07

Compression device

#39
20190032663
2019-01-31

Water lubrication air compression system

#40
20190024663
2019-01-24

Oil-free screw compressor

#41
20180372221
2018-12-27

Mechanical seal for rotary machine

#42
20180340535
2018-11-29

Dry vacuum pump with pressurized bearing and seal

#43
20180335036
2018-11-22

Scroll compressor with oil management system

#44
20180223850
2018-08-09

Compressor

#45
20180187679
2018-07-05

SCROLL COMPRESSOR

#46
20180163726
2018-06-14

Scroll type device having liquid cooling through idler shafts

#47
20180112664
2018-04-26

Screw compressor, compressor element and gearbox applied thereby

#48
20180003187
2018-01-04

Mechanical seal for rotating shaft

#49
20170321697
2017-11-09

Compressor having non-contact and contact seals

#50
20170306959
2017-10-26

Oil-free screw compressor having atmosphere open hole formed in casing and communication hole formed in shaft seal device

#51
20170306958
2017-10-26

Oil-free screw compressor

#52
20170152852
2017-06-01

Rotary fluid machinery and method for eliminating axial rotor displacement

#53
20170130719
2017-05-11

OIL SEAL APPARATUS AND BLOWER COMPRISING THE SAME

#54
20170058846
2017-03-02

Vacuum pump and system of a vacuum pump and an engine

#55
20170016446
2017-01-19

Oil-free screw compressor

#56
20160265666
2016-09-15

3 directional rotary seal for fluid handling machines

#57
20160177951
2016-06-23

Sectional sealing system for rotary screw compressor

#58
20160040668
2016-02-11

Shaft seal for an open-drive compressor

#59
20150337716
2015-11-26

Supercharger

#60
20150260187
2015-09-17

Oil-cooled screw compressor system and oil-cooled screw compressor

#61
20150139844
2015-05-21

Scroll compressor with oil management system

#62
20150110610
2015-04-23

Supercharger assembly with rotor end face seal and method of manufacturing a supercharger assembly

#63
20140341767
2014-11-20

Rotary vacuum pump with circumferential groove for a lubricating and sealing fluid

#64
20140294648
2014-10-02

Apparatus for sealing a pump chamber of a rotary lobe pump, and a rotary lobe pump having said apparatus

#65
20140127057
2014-05-08

Compressor

#66
20130319222
2013-12-05

Sealing element for a rotary piston machine

#67
20130209251
2013-08-15

SEAL ARRANGEMENT ALONG THE SHAFT OF A LIQUID RING PUMP

#68
20130108495
2013-05-02

High pressure seal vent

#69
20130089440
2013-04-11

Liquid ring pump and method for operating a liquid ring pump

#70
20130075975
2013-03-28

Seal for oil-free rotary displacement compressor

#71
20130028730
2013-01-31

COMPRESSOR

#72
20120257997
2012-10-11

Vented motor seal for a compressor

#73
20120257961
2012-10-11

Multistage vacuum pump

#74
20120251368
2012-10-04

Pump

#75
20120251301
2012-10-04

Compressor

#76
20120219407
2012-08-30

Vacuum pump

#77
20120164015
2012-06-28

Water injection type screw fluid machine

#78
20120141314
2012-06-07

VACUUM PUMP

#79
20120093673
2012-04-19

Six-blade biaxial rotary positive-displacement pump

#80
20120082578
2012-04-05

Scroll compressor including seal member and guide ring

#81
20120009077
2012-01-12

Scroll fluid machine having a communication passage between an inner periphery of lip seal and an outer periphery of drive shaft or ring

#82
20120003105
2012-01-05

Dry vacuum pump having multiple lubricant reservoirs

#83
20110256003
2011-10-20

DRY VACUUM PUMP

#84
20110135528
2011-06-09

Oil-free screw compressor

#85
20110076174
2011-03-31

Screw compression apparatus

#86
20110076172
2011-03-31

Scroll pump with isolation barrier

#87
20100189583
2010-07-29

Dry vacuum pump including a lubricating fluid sealing device and a centrifuge element equipping such a device

#88
20100183466
2010-07-22

Displacement machine with improved support

#89
20100111705
2010-05-06

Refrigerant compressor

#90
20100034685
2010-02-11

Seal for a rotary vane pump

#91
20100034682
2010-02-11

Scroll compressor with two scrolls

#92
20090246059
2009-10-01

Scroll compressor having guide ring supporting and urging seal member

#93
20090140495
2009-06-04

Shaft Seal

#94
20080240965
2008-10-02

Rotor shaft sealing method and structure of oil-free rotary compressor

#95
20080240964
2008-10-02

SHAFT SEAL DEVICE FOR OIL-FREE ROTARY COMPRESSOR

#96
20080240963
2008-10-02

ROTOR SHAFT SEALING STRUCTURE FOR OIL-FREE ROTARY COMPRESSOR

#97
20080217862
2008-09-11

Arrangement of a shaft with a mechanical face seal mounted thereon

#98
20080193313
2008-08-14

Scroll compressor with an orbiting scroll and two fixed scrolls and ring and tip seals

#99
20080138220
2008-06-12

Hydraulic pump of automatic transmission

#100
20080112832
2008-05-15

HERMETIC SCREW COMPRESSOR

#101
20080085206
2008-04-10

Fluid machine

#102
20080031753
2008-02-07

Rotary type compressor having an intermediate pressure on a surface side of its compression member

#103
20070280845
2007-12-06

Vacuum pump

#104
20070243092
2007-10-18

Compressor with continuously inclined surface

#105
20070172376
2007-07-26

Vaccum pump having shaft seal to prevent corrosion and to ensure smooth operation

#106
20070172366
2007-07-26

Screw type liquid ring pump with shaft seal arrangement

#107
20060188383
2006-08-24

Vacuum pump with a pair of screw rotors

#108
20060078440
2006-04-13

Shaft seal for rotary type compressor

#109
20060006598
2006-01-12

Seal mechanism in compressor

#110
20050147517
2005-07-07

Vacuum pump

#111
20050123415
2005-06-09

Fluid machine

#112
17965810
2023-10-31

Cantilever vertical screw vacuum pump

#113
15255617
2019-01-22

Non-contracting bidirectional seal for gaseous rotary machines