US3518032A - Compressor cylinder unloader - Google Patents

Compressor cylinder unloader Download PDF

Info

Publication number
US3518032A
US3518032A US740418*A US3518032DA US3518032A US 3518032 A US3518032 A US 3518032A US 3518032D A US3518032D A US 3518032DA US 3518032 A US3518032 A US 3518032A
Authority
US
United States
Prior art keywords
valve
piston
actuator
sleeve
cylinder
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 - Lifetime
Application number
US740418*A
Other languages
English (en)
Inventor
Richard C Degroff
Thomas L King
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.)
Dresser Rand Co
Original Assignee
Dresser Industries Inc
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 Dresser Industries Inc filed Critical Dresser Industries Inc
Application granted granted Critical
Publication of US3518032A publication Critical patent/US3518032A/en
Assigned to DRESSER-RAND COMPANY, CORNING, NEW YORK A GENERAL PARTNERSHIP OF NEW YORK reassignment DRESSER-RAND COMPANY, CORNING, NEW YORK A GENERAL PARTNERSHIP OF NEW YORK ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: DRESSER INDUSTRIES, INC., A DE. CORP.
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • 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
    • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
    • F04B39/10—Adaptations or arrangements of distribution members
    • 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
    • F04B49/24—Bypassing

Definitions

  • An unloader assembly for a gas compressor cylinder includes an open-throated suction valve and a sleeve having one end abutting the valve and communicating with the valve throat.
  • the sleeve defines a chamber for a reciprocating control piston, and has a port which communicates with the suction chamber of the compressor cylinder.
  • the piston In the unloaded position, the piston uncovers the port to provide a flow path between the suction chamber and the cylinder compression chamber through the valve throat; and in the loaded position the control piston covers the sleeve port to close this flow path.
  • the control piston is vented to equalize the pressure acting across it, and is shifted between the loaded and unloaded positions by a fluid operated actuator piston.
  • the valve assembly may become overheated due to the relatively low orifice coeflicient, the force necessary to unseat the valve closures from their valve seats may become excessive, and the valve closures may become damaged because of the high impact forces of the valve closures on the seats at the time of loading.
  • Excessive temperature is a particularproblem at higher differential pressures, due to the restricted and tortuous flow paths through valves of this type; and this condition is aggravated by the fingers of the unloader mehanism which necessarily extend through the valve passages and further restrict air flow during both the loaded and unloaded conditions.
  • An object of the present invention is to provide an improved unloader assembly for a compressor cylinder which is particularly effective at higher differential pressures, and which requires minimum force for operation.
  • An unloader assembly includes a conventional suction valve which is provided with a central passage or throat.
  • a tubular member engaging the outboard face of the valve communicates with the valve throat, and includes a wall port which communicates with the cylinder suction chamber.
  • a control piston slidable within the tubular member, closes communication between the valve throat and the port in one position and opens communication between the valve passage and port in another position.
  • a suction valve opening 15 is provided in the inner wall 11 communicating the suction chamber 14 and the compression chamber; and this opening 15 is provided with an outward facing shoulder 16 which accommodates the suction valve 18.
  • the outer wall 13 includes a larger opening 17, aligned with the valve opening 15.
  • the suction valve 18 is of conventional design, consisting of a stop plate member 19 and a seat member 20 defining a valve lift chamber 21, and a pair of concentric valve closure rings 22 urged against their respective valve seats by springs 23.
  • Radially and angularly spaced transverse passages 24 in the valve seat member communicate the valve lift chamber 21 with the suction chamben 14; and radially and anguarly spaced transverse passages 25 in the stop plate member communicate the valve lift chamber 21 with the compression chamber.
  • the valve 18 is seated on the shoulder 16, and sealed relative thereto with a suitable gasket; and the valve is provided with a transverse central passage or throat 26 which provides an alternative flow path through the valve between the suction chamber 14 and the compression chamber.
  • the outer face of the valve defined by the seat member 20 includes an inner peripheral shoulder 27, adjacent the throat 26, and an outer peripheral shoulder 28.
  • the suction valve 18 is secured against the cylinder shoulder 16 by a valve chair 29 consisting of a flange portion 30 and an integral downwardly extending sleeve portion 31.
  • the sleeve portion 31 extends through the opening 17 in the outer cylinder wall 13; and the lower end of the sleeve portion 31 seats on the valve shoulder 28.
  • the valve chair is secured to the cylinder wall .13 by means of suitable bolts 33 which pass through openings in the flange portion 30.
  • the sleeve portion provides a close fit with the cylinder wall opening 17, and is sealed relative thereto by a suitable O-ring received in an annular groove in the sleeve portion.
  • the valve chair flange portion 30 is provided with a central opening 35 which is aligned with the throat 26 of the valve 18.
  • the opening 35 accommodates tubular sleeve 38, the lower end of which seats on the inner valve shoulder 27 and is sealed to the valve by means of a of a suitable gasket.
  • the upper end of the sleeve 38 provides a close fit with the opening 35, and is provided with an externalannular groove accommodating a suitable O-ring to provide a seal between the sleeve and opening.
  • the sleeve 38 defines a cylindrical chamber 40 for an elongated cylindrical control piston 41; and is provided with one or more wall ports 42 which communicate the interior and exterior of the sleeve.
  • the piston 41 has an axial length greater than the axial span of the ports 42;
  • valve chair sleeve portion 31 is also provided with one or more ports 44, so that the sleeve ports 42 are continuously communicated with the cylinder suction chamber 14.
  • the control piston 41 is actuated by a fluid operated actuator 48 including a generally cylindrical housing defined by a cup-shaped body 49 and a cover 50.
  • the bottom wall of the body 49 includes a downwardly extending cylindrical boss 51 which is received with a close fit within the valve chair opening 35, and is sealed relative to the opening by means of an O-ring received in an external annual groove in the boss 51.
  • the actuator 48 is secured to the valve chair flange portion by means of studs 53, which pass through the actuator body 49 and cover 50', and associated nuts. The actuator 48, then, secures the sleeve 38 against the valve shoulder 27 and closes the upper end of the sleeve.
  • the actuator body and cover define a closed cylinder chamber 56 for an actuator piston 57 which reciprocates within the chamber in sealed relation with the chamber walls.
  • the actuator piston 57 and the control piston 41 are coupled together in axially spaced relation by means of a spindle 58, the spindle passing through a bore 59 in the actuator body boss 51 and being sealed relative thereto by a suitable O-ring.
  • the spindle 58 is provided with an outer extension 61 which passes through a suitable bore 6-2 in the actuator cover 50 in sealed relation therewith.
  • Suitable passages 65 and 66 are provided in the actuator housing for directing operating fluid to and from the chamber 56, respectively above and below the actuator piston 57, for the purpose of shifting the assembly of the pistons 57 and 41 between upper and lower positions.
  • the piston assembly In the drawing the piston assembly is shown, in solid lines, in the lower position, in which the unloader assembly is in the loaded condition. The piston assembly is shifted to and maintained in this position by fluid under pressure directed to the chamber 56 through the passage 65.
  • the control piston 41 spans the sleeve ports 42; and the piston rings 43 provide seals between the piston and sleeve both above and below the ports 42.
  • the control piston 41 is provided with one or more vent passages 45 which provide communication between the opposite faces of the piston and serve to equalize the pressures acting on the opposite faces. With this arrangement, it is not necessary to overcome the compression chamber pressure in order to shift the control piston 41 to the loaded position. With the unloader assembly in the loaded condition, the suction valve 18 functions in the usual manner to admit gas to the compression chamber.
  • the stop sleeve 52 also serves as a positioning boss for one or more compression springs 67, which serve to urge the piston assembly to the lower or loaded position.
  • the spindle extension 61 serves as an external visual indicating for the position of the control piston 41.
  • the orifice coefficient of the unloaded valve is very greatly improved. This provides the advantages that the valve operates much cooler during the unloaded condition and that less engine horsepower is required during the unloaded condition because there is less restriction to the flow of air into and out of the cylinder compression chamber. Also, the orifice coefiicient of the suction valve is improved during the loaded condition because of the absence of unloader fingers in the valve passages. Because of the design wherein the pressures are balanced on the opposite sides of the control piston, the forces necessary to move the mechanism to either the loaded or unloaded position are only those necessary to overcome the seal friction. The mechanism, therefore, is particularly well adapted for operation with cylinders at higher differential pressures; and permits the design of an unloader mechanism for compressor units where it was not heretofore feasible.
  • an unloader assembly for said cylinder comprising:
  • tubular member engaging the outboard side of said suction valve; said suction valve being open-throated to define an air passage therethrough communicating with said tubular member; said tubular member having a wall opening defining a port communicating with said suction chamber;
  • control piston slidable in said tubular member; said control piston cutting off communication between said port and said air passage in a first position, and opening communication between said port and said air passage in a second position; and means for moving said control piston between said first and second positions.
  • control piston having a longitudinal extent greater than that of said port, and said piston covering said port in said first position;
  • passage means extending between the opposite faces of said control piston to equalize the pressures acting thereon.
  • an actuator for said control piston including housing defining a closure wall for the outboard end of said tubular member; an actuator piston slidable within said actuator housing; spindle means coupling said control piston and said actuator piston, said spindle means extending through said closure wall in sealed relation therewith; and means for directing an actuating fluid to the opposite faces of said actuator piston.
  • V an indicator rod extending outwardly from said actuator piston in parallel relation to said spindle; said indicator rod extending through the outboard wall of said actuator housing to visually indicate the position of said control piston within said tubular member.
  • said cylinder defining an outward facing shoulder for receiving said suction valve; the outboard face of said suction valve defining an outward facing peripheral shoulder; a valve chair engaging said valve shoulder; means securing said valve chair to said cylinder,
  • valve chair defining a wall opening axially aligned with said valve passage and axially spaced therefrom; and said tubular member engaging said suction valve in sealed relation at its inboard end and engaging said valve chair wall opening in sealed relation at its chair; said actuator housing engaging the outboard end of said tubular member to maintain said member in engagement with said valve.
  • said actuator housing defining an actuator cylinder
  • an actuator piston slidable in said actuator cylinder; a spindle coupling said actuator piston and said control piston, said spindle passing through said closure wall in sealed relation; and means for directing an actuating fluid to the opposite faces of said actuator piston to shift said control piston between said first and second positions.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Compressor (AREA)
US740418*A 1968-05-24 1968-05-24 Compressor cylinder unloader Expired - Lifetime US3518032A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US74041868A 1968-05-24 1968-05-24

Publications (1)

Publication Number Publication Date
US3518032A true US3518032A (en) 1970-06-30

Family

ID=24976418

Family Applications (1)

Application Number Title Priority Date Filing Date
US740418*A Expired - Lifetime US3518032A (en) 1968-05-24 1968-05-24 Compressor cylinder unloader

Country Status (5)

Country Link
US (1) US3518032A (fr)
DE (1) DE1924213A1 (fr)
FR (1) FR2009235A1 (fr)
GB (1) GB1263160A (fr)
NL (1) NL162177C (fr)

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3641882A (en) * 1969-03-07 1972-02-15 Sheepbridge Stokes Ltd Cylinder liner
US4167262A (en) * 1976-10-12 1979-09-11 Hunt Valve Co., Inc. Pilot actuated valve
US4195554A (en) * 1977-04-07 1980-04-01 Kommanditbolaget United Stirling (Sweden) Ab & Co. Multi-cylinder double-acting hot gas engine
EP0009145A1 (fr) * 1978-09-20 1980-04-02 Carrier Corporation Dispositif de régulation de capacité d'un compresseur de réfrigération
US4285495A (en) * 1977-12-12 1981-08-25 King Ottis W Safety valve
US4445824A (en) * 1981-11-02 1984-05-01 Ball Value Co., Inc. Valve for compressor clearance or by-pass control
US4447193A (en) * 1981-07-20 1984-05-08 Ball Valve Co., Inc. Compressor unloader apparatus
US4566491A (en) * 1983-01-28 1986-01-28 Azionaria Costruzioni Macchine Automatiche - A.C.M.A. - S.P.A. Valve especially suitable for use in filling machines
US5580225A (en) * 1995-07-27 1996-12-03 Pettibone Corporation Pulsation causing check valve assembly for a plural piston pump system
US5632466A (en) * 1995-06-30 1997-05-27 Ochs; Paul Piston actuated pressure reducing valve
US5934870A (en) * 1996-09-10 1999-08-10 Ghh Borsig Turbomaschinen Gmbh Steam turbine control utilizing a water hydraulic drive
US20070253838A1 (en) * 2006-04-28 2007-11-01 Daniel Leiss Air compressor unloader system
US20110146813A1 (en) * 2008-04-10 2011-06-23 Paul Wadham Tamper-resistant valve and connection arrangement
US20120160344A1 (en) * 2010-01-15 2012-06-28 Ckd Corporation Vacuum control valve and vacuum control system
CN103321883A (zh) * 2013-06-24 2013-09-25 北京化工大学 一种往复压缩机气量调节***执行油缸
US20140197345A1 (en) * 2013-01-14 2014-07-17 Dayco Ip Holdings, Llc Piston actuator controlling a valve and method for operating the same
CN105545868A (zh) * 2016-01-27 2016-05-04 北京博华信智科技股份有限公司 一种往复压缩机气量调节***执行油缸
US20220403834A1 (en) * 2019-12-19 2022-12-22 Dresser-Rand Company Reciprocating compressor valve assembly

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2319569A (en) * 1996-11-22 1998-05-27 Knorr Bremse Systeme Unloading gas compressors
CN104481846A (zh) * 2014-12-12 2015-04-01 贵州中电振华精密机械有限公司 双作用平衡进气阀

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US770784A (en) * 1903-11-02 1904-09-27 Edwin H Steedman Pressure control for air-compressors.
US1291854A (en) * 1917-03-02 1919-01-21 Ingersoll Rand Co Unloader for compressors.
US1948907A (en) * 1931-04-18 1934-02-27 Egli Eugen Compressor
US2751143A (en) * 1953-02-02 1956-06-19 Westinghouse Electric Corp Unloading mechanisms for refrigerant compressors
US2831625A (en) * 1956-06-29 1958-04-22 Worthington Corp Unloader for compressor
US3076593A (en) * 1958-09-15 1963-02-05 Alwin B Newton Flow regulator for piston-equipped cylinder
US3294314A (en) * 1965-03-24 1966-12-27 Hoerbiger Ventilwerke Ag Lifting device for compressor valves

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US770784A (en) * 1903-11-02 1904-09-27 Edwin H Steedman Pressure control for air-compressors.
US1291854A (en) * 1917-03-02 1919-01-21 Ingersoll Rand Co Unloader for compressors.
US1948907A (en) * 1931-04-18 1934-02-27 Egli Eugen Compressor
US2751143A (en) * 1953-02-02 1956-06-19 Westinghouse Electric Corp Unloading mechanisms for refrigerant compressors
US2831625A (en) * 1956-06-29 1958-04-22 Worthington Corp Unloader for compressor
US3076593A (en) * 1958-09-15 1963-02-05 Alwin B Newton Flow regulator for piston-equipped cylinder
US3294314A (en) * 1965-03-24 1966-12-27 Hoerbiger Ventilwerke Ag Lifting device for compressor valves

Cited By (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3641882A (en) * 1969-03-07 1972-02-15 Sheepbridge Stokes Ltd Cylinder liner
US4167262A (en) * 1976-10-12 1979-09-11 Hunt Valve Co., Inc. Pilot actuated valve
US4195554A (en) * 1977-04-07 1980-04-01 Kommanditbolaget United Stirling (Sweden) Ab & Co. Multi-cylinder double-acting hot gas engine
US4285495A (en) * 1977-12-12 1981-08-25 King Ottis W Safety valve
EP0009145A1 (fr) * 1978-09-20 1980-04-02 Carrier Corporation Dispositif de régulation de capacité d'un compresseur de réfrigération
US4447193A (en) * 1981-07-20 1984-05-08 Ball Valve Co., Inc. Compressor unloader apparatus
US4445824A (en) * 1981-11-02 1984-05-01 Ball Value Co., Inc. Valve for compressor clearance or by-pass control
US4566491A (en) * 1983-01-28 1986-01-28 Azionaria Costruzioni Macchine Automatiche - A.C.M.A. - S.P.A. Valve especially suitable for use in filling machines
US5632466A (en) * 1995-06-30 1997-05-27 Ochs; Paul Piston actuated pressure reducing valve
US5580225A (en) * 1995-07-27 1996-12-03 Pettibone Corporation Pulsation causing check valve assembly for a plural piston pump system
US5934870A (en) * 1996-09-10 1999-08-10 Ghh Borsig Turbomaschinen Gmbh Steam turbine control utilizing a water hydraulic drive
US20070253838A1 (en) * 2006-04-28 2007-11-01 Daniel Leiss Air compressor unloader system
US20110146813A1 (en) * 2008-04-10 2011-06-23 Paul Wadham Tamper-resistant valve and connection arrangement
US8899262B2 (en) * 2008-04-10 2014-12-02 Linde Aktiengesellschaft Tamper-resistant valve and connection arrangement
US20120160344A1 (en) * 2010-01-15 2012-06-28 Ckd Corporation Vacuum control valve and vacuum control system
US8573560B2 (en) * 2010-01-15 2013-11-05 Ckd Corporation Vacuum control valve and vacuum control system
US20140197345A1 (en) * 2013-01-14 2014-07-17 Dayco Ip Holdings, Llc Piston actuator controlling a valve and method for operating the same
US9671034B2 (en) * 2013-01-14 2017-06-06 Dayco Ip Holdings, Llc Piston actuator controlling a valve and method for operating the same
CN103321883A (zh) * 2013-06-24 2013-09-25 北京化工大学 一种往复压缩机气量调节***执行油缸
CN103321883B (zh) * 2013-06-24 2015-07-15 北京化工大学 一种往复压缩机气量调节***执行油缸
CN105545868A (zh) * 2016-01-27 2016-05-04 北京博华信智科技股份有限公司 一种往复压缩机气量调节***执行油缸
CN105545868B (zh) * 2016-01-27 2017-12-08 北京博华信智科技股份有限公司 一种往复压缩机气量调节***执行油缸
US20220403834A1 (en) * 2019-12-19 2022-12-22 Dresser-Rand Company Reciprocating compressor valve assembly
US11788525B2 (en) * 2019-12-19 2023-10-17 Siemens Energy, Inc. Reciprocating compressor valve assembly

Also Published As

Publication number Publication date
GB1263160A (en) 1972-02-09
NL162177B (nl) 1979-11-15
NL162177C (nl) 1980-04-15
FR2009235A1 (fr) 1970-01-30
DE1924213A1 (de) 1970-08-20
NL6907574A (fr) 1969-11-26

Similar Documents

Publication Publication Date Title
US3518032A (en) Compressor cylinder unloader
US2191458A (en) Valve
JP4392615B2 (ja) パイロット式２ポート弁
US5503537A (en) Gas compressor
US3405606A (en) Control of double-acting pressure medium energized servo-motors
US4640309A (en) Pilot operated poppet valve with speed control
US2745387A (en) Reciprocating fluid motor and valve mechanism therefor
US2763425A (en) Compressor unloader
US3262464A (en) Drain valve
US20020179146A1 (en) Pneumatic snap pilot
US4326839A (en) Cylinder unloading mechanism for refrigeration compressor
US3101187A (en) Fluid pressure operated piston valve
CA1047010A (fr) Purge/detente de compresseur
EP0150615A1 (fr) Soupape pneumatique
US2036846A (en) Compressor
US1708171A (en) Compressor-unloading means
US1528086A (en) Compressor
EP3415757B1 (fr) Soupape à géométrie variable pour compresseurs alternatifs
US2526922A (en) Compressor
US2036847A (en) Compressor
US2025294A (en) Compressor unloader
US2652033A (en) Pressure fluid actuated valve operating mechanism
US727484A (en) Valve.
US3181567A (en) Four port reversing valve
US1377981A (en) Compressor-controlling mechanism

Legal Events

Date Code Title Description
AS Assignment

Owner name: DRESSER-RAND COMPANY, CORNING, NEW YORK A GENERAL

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:DRESSER INDUSTRIES, INC., A DE. CORP.;REEL/FRAME:004720/0833

Effective date: 19861231