US3788776A - Compressor unloading control - Google Patents

Compressor unloading control Download PDF

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Publication number
US3788776A
US3788776A US00279408A US3788776DA US3788776A US 3788776 A US3788776 A US 3788776A US 00279408 A US00279408 A US 00279408A US 3788776D A US3788776D A US 3788776DA US 3788776 A US3788776 A US 3788776A
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United States
Prior art keywords
compressor
valve
gas
pressure
inlet
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Expired - Lifetime
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US00279408A
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English (en)
Inventor
R Post
M Herschler
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Gardner Denver Inc
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Gardner Denver Inc
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/02—Stopping, starting, unloading or idling control
    • F04B49/022—Stopping, starting, unloading or idling control by means of pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/22—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by means of valves
    • F04B49/225—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by means of valves with throttling valves or valves varying the pump inlet opening or the outlet opening
    • 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

Definitions

  • 417/295 to the Power Operated valve includes a flow restrictor 2,170,358 8/1939 Wainwright 417/295 x of Suitable Size to Provide for a 10W residual Pressure 2,787,411 4/ 1957 Hughes 417/295 in the reservoir tank to insure adequate liquid circula- 3,105,630 10/1963 Lowler et aL... 417/295 tion during compressor unloaded operation. 2,894,677 7/1959 Nash....
  • SUMMARY OF THE INVENTION ent invention includes a single power operated valve operable at a predetermined pressure in a compressed gas storage means to relieve the gas pressure in a separator-reservoir tank downstream of the compressor and provide pressure gas to at least partially close a pressure fluid actuated inlet throttling valve.
  • the compressor unloader control of the present invention provides a reliable and economical arrangement which functions to control compressor operation in a way similar to more complex control systems.
  • FIG. 1 illustrates schematically a liquid injected compressor including the unloader control system of the present invention.
  • FIG. 2 is a detail section view of the inlet throttling valve of the control system shown inFIG. 1.
  • a liquid injected air compressor unit is shown schematically and generally designated by the numeral 10.
  • the compressor unit 10 includes a positive displacement rotary compressor 12 which may be of the helical screw or sliding vane type, both well known.
  • the compressor 12 is suited for the direct injection of a liquid into the compressor working chamber for mixing with the air being compressed.
  • the liquid used is usually a suitable oil and serves as a lubricant for the compressor bearings and other parts subject to wear as well as a coolant for absorbing the heat of compression and a sealant for reducing the rotor clearances in the working chamber.
  • the compressor 12 is connected to an electric motor 14, although other types of prime movers may be used.
  • the compressor unit 10 is also characterized by discharge means including an air-oil separator and reservoir tank 16 and a discharge line 18 which is connected to the compressor 12 for conducting to the tank 16 the oil-air mixture discharged from the compressor.
  • the tank 16 includes suitable means, not shown, for separating oil from the oil-air mixture whereby substantially oil free air may be conducted through a conduit 20 to a compressed air storage means 22.
  • a check valve 24, interposed in the conduit 20, is operable to prevent the backflow of pressure air from the storage means 22 to the oil reservoir tank 16.
  • the compressed air storage means 22 includes an outlet conduit 26 for work purposes of the compressed air stored therein.
  • An oil re turn conduit 28 is connected to the tank 16 for conducting oil through a filter 30 and a heat exchanger 32 and finally to the compressor 12 for continuous reinjection.
  • the compressor unit 10 is further characterized by an inlet throttling valve generally designated by numeral 34.
  • the inlet throttling valve 34 includes a housing 36 having an opening 38 into an interior 40 which is in communication with the compressor inlet means' 41 opening into a working chamber 43.
  • a suitable air filter-silencer 42 is fitted in the opening 38.
  • the housing 36 also includes a portion forming a valve seat 44 which may be engaged by a valve closure member 46 to close off the compressor inlet.
  • the closure member 46 includes a stem 48 which is supported in a housing portion 50.
  • the housing portion 50 includes a chamber 52 in which is disposed actuating means comprising a-piston 54 engageable with the stem 48 for moving the closure member 46 toward the seat 44 to throttle the flow of inlet air into the compressor 12.
  • the valve 34 also includes a coil spring 56 in the housing portion 50 for biasing the piston toward a cover member 58.
  • a coil spring 60 is disposed between the stem 48 and piston 54 for biasing the closure member 46 against the seat 44 with light force to prevent the backflow of oil out of the compressor 12 under certain conditions on shutdown.
  • the inlet throttling valve 34 comprises part of an unloader control system for the compressor unit 10 which also includes a conduit 62 leading from the tank 16 to a power operated valve 64.
  • the valve 64 is represented schematically in the drawing as a two-position normally open valve having a solenoid actuator 66; that is the valve is open to permit the relief of pressure in the tank 16 when not energized and is closed when energized.
  • the valve 64 is commercially available in a number of conduit sizes.
  • the valve 64 is also connected to the chamber 52 by a conduit 68 and to the inlet opening 38 by a conduit 70.
  • the conduit 70 opens into the inlet opening 38 through restricted passage means 72 formed in the valve housing 36.
  • the unloader control system for the compressor unit it also includes a pressure responsive electric switch 74 in communication with the air storage means 22 by way of a conduit 76.
  • the switch 74 may be of a well known type which is adjustable to open a set of circuit contacts on increasing pressure at a first predetermined pressure and close said set of contacts to complete an electrical circuit at a second predetermined pressure less than the first pressure.
  • the switch 74 is suitably connected to the solenoid valve 64 and to a source of electric energy, not shown, to energize the valve to be in the closed position when the air pressure in the storage means 22 decreases to a value below the second predetermined pressure and to remain closed until the air pressure increases to the first predetermined pressure.
  • the unloader control system herein described operates to control the compressed air output of the compressor 12 and to reduce the compressor power demand during periods of nonuse of compressed air from the storage means 22. Assuming that the compressor unit is running and the pressure in air storage means 22 is less than the pressure required to open the switch 74, the valve 64 will be in the closed position and the inlet throttling valve piston 54 will be biased toward the cover member 58 permitting the closure member 46 to be open to allow air to enter the compressor inlet. Normal use of the compressor unit .10 will result in a sufficient pressure in the tank 16 to force the oil separated therein to continuously recirculate through filter and heat exchanger 32 and back to the compressor 12. A reduction or cessation of use of compressed air for work purposes will cause a pressure increase in storage means 22.
  • valve 64 When the pressure increases to the first predetermined pressure the switch 74 will be actuated to open the circuit to valve 64 to deenergize the solenoid 66 causing the valve to open.
  • the opening of valve 64 will substantially vent pressure air in the tank 16 through conduit 70 into the inlet opening 38.
  • the check valve 24 will prevent back flow of compressed air from storage means 22 to the tank 16. Venting the tank 16 into the inlet opening 38 will not create objectionable noise due to the noise muffling ability of the air inlet filter-silencer 42.
  • the restricted passage 72 will limit the rate of bleeddown or venting of the tank 16 and, accordingly, pressure air in the conduit 68 will be conducted to the chamber 52 to cause the piston 54 to move the closure member 46 toward the seat 44 to throttle the flow of inlet air to the compressor.
  • the closure member 46 will move to throttle inlet air to the compressor 12 until a balanced or steady state condition of reduced compressor air throughput is reached.
  • This balanced operating condition is desirably one wherein the pressure in the tank 16 is on the order of 5-16 percent of the normal working pressure of the compressor unit. Under this operating condition a sufficient pressure differential will exist between the tank 16 and the compressor working chamber to assure adequate oil flow to the compressor.
  • the back pressure which the compressor must work against together with the reduced compressor inlet flow will result in suitably low power consumption while the compressor is unloaded and the small amount of air admitted to the compressor will provide quiet operation and scavenging of the oil being injected for lubrication and cooling purposes.
  • the reduced pressure and flow conditions at which the compressor unit operates while unloaded may be controlled by selection of the size of the restricted passage means 72 as well as by determining the area of the piston pressure surface 55 and the force-deflection characteristic of the spring 56.
  • the restricted passage means 72 may be formed as an orifice at any location in the conduit downstream of the junction with conduit 68, and the restriction to flow may be provided by proper selection of the internal diameter and length of the conduit 70 itself rather than the orifice formed by the passage means 72.
  • a structurally simple and reliable unloader control system is provided by the present invention which is operable to provide for reduced unloaded power consumption of a liquid injected gas compressor while maintaining suitable liquid circulation and quiet running of the compressor.
  • the'control system of the present invention is disclosed in detail in combination with a liquid injected gas compressor unit it is contemplated that certain so-called dry type compressor units may also use the disclosed arrangement.
  • the unloader control system of the present invention provides for the same functions as certain prior art control systems but with a minimum of attendant devices.
  • the electric pressure switch 74 and solenoid operated valve 64 may be replaced by equivalent fluid operated devices such as a pilot pressure valve responsive to pressure in the storage means and connected to a twoposition pilot pressure fluid actuated valve.
  • a gas compressor including gas inlet and discharge means
  • gas storage means connected to said discharge means for receiving and storing compressed gas
  • a compressor inlet throttling valve connected to said inlet means and including a closure member and pressure fluid actuating means for moving said closure member to throttle inlet gas flow to said compressor; and an unloader control system characterized by:
  • vent means connected to said conduit between said valve means and said actuating means for controlled venting of said discharge means to a gas pressure in said discharge means which is less than the gas pressure in' said storage means in response to opening of said valve means.
  • said vent means includes conduit means connected to said conduit between said valve means and said actuating means and including means for controlling the venting of said discharge means in response to the opening of said valve means.
  • said inlet throttling valve includes a housing including an inlet opening, a chamber, and piston means disposed in said chamber and movable in response to the admission of pressure fluid to said chamber to move said closure member to throttle inlet gas flow to said compressor, and said conduit opens into said chamber for admitting gas from said discharge means to exert a pressure force on said piston means.
  • biasing means for biasing said piston means to move against the pressure force exerted on said piston means by said gas in said chamber.
  • said means for controlling the venting of said discharge means comprises restricted passage means of a predetermined size which will control the venting of said discharge means to provide a reduced pressure in said conduit and said chamber for moving said closure member to a position which will provide for a reduced inlet gas flow to said compressor.
  • said restricted passage means opens into said inlet opening in said housing.
  • said compressor is liquid injected
  • said discharge means includes a gas-liquid separator tank and said vent means is operable to vent said tank to a reduced presssure less than said predetermined pressure in response to the opening of said valve means.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)
  • Compressor (AREA)
  • Control Of Positive-Displacement Pumps (AREA)
US00279408A 1972-08-10 1972-08-10 Compressor unloading control Expired - Lifetime US3788776A (en)

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Application Number Priority Date Filing Date Title
US27940872A 1972-08-10 1972-08-10

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US3788776A true US3788776A (en) 1974-01-29

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US (1) US3788776A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
JP (1) JPS5340965B2 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
AU (1) AU472958B2 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
BE (1) BE798920A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
CA (1) CA966465A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
GB (1) GB1415936A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
ZA (1) ZA731143B (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)

Cited By (28)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3961862A (en) * 1975-04-24 1976-06-08 Gardner-Denver Company Compressor control system
US4052135A (en) * 1976-05-11 1977-10-04 Gardner-Denver Company Control system for helical screw compressor
US4068980A (en) * 1976-10-01 1978-01-17 Gardner-Denver Company Compressor startup control
US4227380A (en) * 1979-11-09 1980-10-14 Frick Company Single casing, multiple duty valve
US4358247A (en) * 1979-07-10 1982-11-09 Hitachi, Ltd. Oil cooled compressor
US4361417A (en) * 1979-06-12 1982-11-30 Hitachi, Ltd. Oil-cooled compressor
US4388046A (en) * 1977-05-25 1983-06-14 Hydrovane Compressor Company Limited Rotary compressors
US4406588A (en) * 1980-11-03 1983-09-27 Rudolf Hofmann Compressor suction regulator
US4685310A (en) * 1986-10-14 1987-08-11 Frick Company Multi-purpose valve assembly
EP0391064A1 (en) * 1989-04-03 1990-10-10 Dresser Industries, Inc. Intake valve for vacuum compressor
EP0758055A1 (en) * 1995-08-07 1997-02-12 Ingersoll-Rand Company Apparatus and method for electronically controlling inlet flow and preventing backflow in a compressor
US6146100A (en) * 1998-03-10 2000-11-14 Atlas Copco Airpower, Naamloze Vennootschap Compressor unit and control device used thereby
EP1094222A1 (en) * 1999-10-21 2001-04-25 Virgilio Mietto Automatic regulator for sucking air in a reservoir
US6394764B1 (en) 2000-03-30 2002-05-28 Dresser-Rand Company Gas compression system and method utilizing gas seal control
US6431210B1 (en) 2001-03-27 2002-08-13 Ingersoll-Rand Company Inlet unloader valve
US20020155007A1 (en) * 2001-04-19 2002-10-24 Mietto Virgilio Intake regulator for compressed air in a reservoir
US6474953B2 (en) * 2000-02-22 2002-11-05 Atlas Copco Airpower, Naamloze Vennootschap Compressor control system and method for controlling the same
US20040261418A1 (en) * 2001-10-01 2004-12-30 Peter Sandberg Arrangement at gas turbine
US20060018769A1 (en) * 2002-08-22 2006-01-26 Wouter Van Praag Compressor with capacity control
CN103410717A (zh) * 2013-07-16 2013-11-27 山河智能装备股份有限公司 一种液压钻车空压机系统卸荷控制装置及方法
EP2960512A1 (en) * 2012-02-28 2015-12-30 Atlas Copco Airpower Compressor device, as well as the use of such an assembly
CN105443357A (zh) * 2015-12-31 2016-03-30 广东顺德孔山重工机械有限公司 一种空压机用活塞式进气控制阀
CN105443358A (zh) * 2015-12-31 2016-03-30 广东顺德孔山重工机械有限公司 一种具有空气进气控制和气路止回功能的空压机
EP3014153A1 (de) * 2013-06-28 2016-05-04 GEA AWP GmbH Rückschlagventil-filter-baugruppe
US9850896B2 (en) 2012-02-28 2017-12-26 Atlas Copco Airpower, Naamloze Vennootschap Screw compressor
US11015602B2 (en) 2012-02-28 2021-05-25 Atlas Copco Airpower, Naamloze Vennootschap Screw compressor
CN115653901A (zh) * 2022-11-29 2023-01-31 淄博水环真空泵厂有限公司 瓦斯抽采泵的流量调节系统
US20240068461A1 (en) * 2022-08-23 2024-02-29 Bauer Compressors, Inc. Compressor crankcase oil reclamation system

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5825600A (ja) * 1982-07-19 1983-02-15 Hitachi Ltd 回転形圧縮機の容量調整装置
EP0130662B1 (en) * 1983-04-08 1988-06-29 Cash Engineering Co. Pty. Limited Compressor control system
AT403948B (de) * 1994-07-29 1998-06-25 Hoerbiger Ventilwerke Ag Ansaugregelventil für rotationsverdichter

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1863866A (en) * 1929-11-21 1932-06-21 Sullivan Machinery Co Compressor controlling mechanism
US2170358A (en) * 1936-03-25 1939-08-22 Wainwright Charles Multistep intake unloader
US2787411A (en) * 1952-04-28 1957-04-02 Joy Mfg Co Compressor unloading mechanism
US2894677A (en) * 1956-10-16 1959-07-14 Chicago Pneumatic Tool Co Rotary compressor control
US3059832A (en) * 1954-05-11 1962-10-23 Chicago Pneumatic Tool Co Unloader control for a rotary compressor
US3105630A (en) * 1960-06-02 1963-10-01 Atlas Copco Ab Compressor units
US3168236A (en) * 1963-09-05 1965-02-02 Jaeger Machine Co Oil scavenging system for a rotary compressor
US3582233A (en) * 1969-04-24 1971-06-01 Worthington Corp Rotary compressor control system
US3602610A (en) * 1970-02-19 1971-08-31 Worthington Corp Control system for rotary compressors

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1863866A (en) * 1929-11-21 1932-06-21 Sullivan Machinery Co Compressor controlling mechanism
US2170358A (en) * 1936-03-25 1939-08-22 Wainwright Charles Multistep intake unloader
US2787411A (en) * 1952-04-28 1957-04-02 Joy Mfg Co Compressor unloading mechanism
US3059832A (en) * 1954-05-11 1962-10-23 Chicago Pneumatic Tool Co Unloader control for a rotary compressor
US2894677A (en) * 1956-10-16 1959-07-14 Chicago Pneumatic Tool Co Rotary compressor control
US3105630A (en) * 1960-06-02 1963-10-01 Atlas Copco Ab Compressor units
US3168236A (en) * 1963-09-05 1965-02-02 Jaeger Machine Co Oil scavenging system for a rotary compressor
US3582233A (en) * 1969-04-24 1971-06-01 Worthington Corp Rotary compressor control system
US3602610A (en) * 1970-02-19 1971-08-31 Worthington Corp Control system for rotary compressors

Cited By (38)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3961862A (en) * 1975-04-24 1976-06-08 Gardner-Denver Company Compressor control system
US4052135A (en) * 1976-05-11 1977-10-04 Gardner-Denver Company Control system for helical screw compressor
US4068980A (en) * 1976-10-01 1978-01-17 Gardner-Denver Company Compressor startup control
US4388046A (en) * 1977-05-25 1983-06-14 Hydrovane Compressor Company Limited Rotary compressors
US4361417A (en) * 1979-06-12 1982-11-30 Hitachi, Ltd. Oil-cooled compressor
US4358247A (en) * 1979-07-10 1982-11-09 Hitachi, Ltd. Oil cooled compressor
US4227380A (en) * 1979-11-09 1980-10-14 Frick Company Single casing, multiple duty valve
US4406588A (en) * 1980-11-03 1983-09-27 Rudolf Hofmann Compressor suction regulator
US4685310A (en) * 1986-10-14 1987-08-11 Frick Company Multi-purpose valve assembly
EP0391064A1 (en) * 1989-04-03 1990-10-10 Dresser Industries, Inc. Intake valve for vacuum compressor
EP0758055A1 (en) * 1995-08-07 1997-02-12 Ingersoll-Rand Company Apparatus and method for electronically controlling inlet flow and preventing backflow in a compressor
US6146100A (en) * 1998-03-10 2000-11-14 Atlas Copco Airpower, Naamloze Vennootschap Compressor unit and control device used thereby
EP1094222A1 (en) * 1999-10-21 2001-04-25 Virgilio Mietto Automatic regulator for sucking air in a reservoir
US6474953B2 (en) * 2000-02-22 2002-11-05 Atlas Copco Airpower, Naamloze Vennootschap Compressor control system and method for controlling the same
US6394764B1 (en) 2000-03-30 2002-05-28 Dresser-Rand Company Gas compression system and method utilizing gas seal control
US6431210B1 (en) 2001-03-27 2002-08-13 Ingersoll-Rand Company Inlet unloader valve
US20020155007A1 (en) * 2001-04-19 2002-10-24 Mietto Virgilio Intake regulator for compressed air in a reservoir
US6715998B2 (en) * 2001-04-19 2004-04-06 Mietto Virgilio Intake regulator for compressed air in a reservoir
US20040261418A1 (en) * 2001-10-01 2004-12-30 Peter Sandberg Arrangement at gas turbine
US7051534B2 (en) * 2001-10-01 2006-05-30 Camfil Ab Gas turbine arrangement having an integrated filter housing and compressor bleed duct
US7607899B2 (en) * 2002-08-22 2009-10-27 Atlas Copco Airpower, Naamloze Vennootschap Compressor with capacity control
US20060018769A1 (en) * 2002-08-22 2006-01-26 Wouter Van Praag Compressor with capacity control
US9850896B2 (en) 2012-02-28 2017-12-26 Atlas Copco Airpower, Naamloze Vennootschap Screw compressor
US11015602B2 (en) 2012-02-28 2021-05-25 Atlas Copco Airpower, Naamloze Vennootschap Screw compressor
US10480511B2 (en) 2012-02-28 2019-11-19 Atlas Copco Airpower, Naamloze Vennootschap Screw compressor
EP2960512A1 (en) * 2012-02-28 2015-12-30 Atlas Copco Airpower Compressor device, as well as the use of such an assembly
US10197058B2 (en) 2012-02-28 2019-02-05 Atlas Copco Airpower, Naamloze Vennootschap Screw compressor
US10151313B2 (en) 2012-02-28 2018-12-11 Atlas Copco Airpower, Naamloze Vennootschap Compressor device as well as the use of such a compressor device
EP3014153A1 (de) * 2013-06-28 2016-05-04 GEA AWP GmbH Rückschlagventil-filter-baugruppe
US20160290521A1 (en) * 2013-06-28 2016-10-06 GEA AWP GmbH Non-return valve/filter unit
CN103410717B (zh) * 2013-07-16 2015-05-20 山河智能装备股份有限公司 一种液压钻车空压机系统卸荷控制装置及方法
CN103410717A (zh) * 2013-07-16 2013-11-27 山河智能装备股份有限公司 一种液压钻车空压机系统卸荷控制装置及方法
CN105443357B (zh) * 2015-12-31 2017-11-14 广东顺德孔山重工机械有限公司 一种空压机用活塞式进气控制阀
CN105443358A (zh) * 2015-12-31 2016-03-30 广东顺德孔山重工机械有限公司 一种具有空气进气控制和气路止回功能的空压机
CN105443357A (zh) * 2015-12-31 2016-03-30 广东顺德孔山重工机械有限公司 一种空压机用活塞式进气控制阀
US20240068461A1 (en) * 2022-08-23 2024-02-29 Bauer Compressors, Inc. Compressor crankcase oil reclamation system
US12241461B2 (en) * 2022-08-23 2025-03-04 Bauer Compressors, Inc. Compressor crankcase oil reclamation system
CN115653901A (zh) * 2022-11-29 2023-01-31 淄博水环真空泵厂有限公司 瓦斯抽采泵的流量调节系统

Also Published As

Publication number Publication date
BE798920A (fr) 1973-08-16
GB1415936A (en) 1975-12-03
AU472958B2 (en) 1976-06-10
ZA731143B (en) 1974-10-30
CA966465A (en) 1975-04-22
AU5243773A (en) 1974-08-22
JPS4952311A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1974-05-21
JPS5340965B2 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1978-10-30

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