US3549280A - Screw machine - Google Patents

Screw machine Download PDF

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Publication number
US3549280A
US3549280A US788511A US3549280DA US3549280A US 3549280 A US3549280 A US 3549280A US 788511 A US788511 A US 788511A US 3549280D A US3549280D A US 3549280DA US 3549280 A US3549280 A US 3549280A
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US
United States
Prior art keywords
slide
piston
pressure
pressure equalization
inlet
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
US788511A
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English (en)
Inventor
Hans Linneken
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.)
Gutehoffnungshutte Sterkrade AG
Original Assignee
Gutehoffnungshutte Sterkrade AG
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 Gutehoffnungshutte Sterkrade AG filed Critical Gutehoffnungshutte Sterkrade AG
Application granted granted Critical
Publication of US3549280A publication Critical patent/US3549280A/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F04C28/00—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids
    • F04C28/10—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids characterised by changing the positions of the inlet or outlet openings with respect to the working chamber
    • F04C28/12—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids characterised by changing the positions of the inlet or outlet openings with respect to the working chamber using sliding valves

Definitions

  • a rotary screw compressor or pump, r helical vane compressor includes a housing having an inlet deiined at one end of the compressor rotors and an outlet adjacent the Outlet end.
  • the slide is connected to a pressure equalization piston which is charged by the exit or inlet pressure of the pump medium in a direction opposite to the charging of the slide.
  • This invention relates, in general, to the construction of a rotary compressor, and in particular, to a new and useful compressor or pump having a displaceable slide for controlling its output.
  • Screw compressors or pumps which include a means for varying the output from two interengaging rotors.
  • they may include an adjustable tap opening which leads to the compressor discharge.
  • the working spaces of the rotors, as dened by the peripheries of the rotor vanes or threads, can come into communication with this tap opening for a regulated period of time which is dependent upon the position of a slide which serves as a control member.
  • Such a slide which is movable or adjustable relative to the rotors, is subjected to forces in axial directions which correspond to the variations of the charging on the respective ends of the rotor as determined by the inlet and outlet operating pressures of the machine.
  • the drive of the slide is caused by means of a piston which is charged on one or two sides.
  • the piston is hydraulically actuated and this construction requires a constantly complicated return or recycling of the oil flow in order to maintain a predetermined slide position.
  • a construction which includes a control slide which is connected with a pressure equalization piston.
  • the pressure ICC equalization piston is charged by the inlet or discharge pressure of the medium being pumped and in a direction opposite to that at which the slide is charged.
  • the corresponding end faces of the slide and the pressure equalization piston are of the same size, or at least, almost the same size.
  • the slide and the pressure equalization piston are thus only charged by the through-put medium. No auxiliary energy is necessary and this means that both the quantity of the medium being pumped and also the pressure ratio of the machine can be charged without changing the axial thrust equalization of the slide.
  • an object of the invention to provide an improved screw compressor which includes a slide which is connected to a pressure equalization piston, the piston being charged by either the inlet or the discharge pressure in a direction opposite to that in which the slide is charged.
  • a further object of the invention is to provide a screw compressor which is simple in design, rugged in construction and economical to manufacture.
  • the invention embodied therein comprises a casing or housing 3 for a spiral lobe or screw compresor having an inlet and an outlet or discharge 2 spaced axially and vertlcally therefrom.
  • the compressor comprises a pair of rotors or lobes only one of which, rotor 4, is visible 1n the drawing.
  • the rotors cooperate to draw air or other fluid inwardly from the inlet 1 and discharge it out through the outlet or discharge 2.
  • the rotors are supported on axially spaced bearings 5 and 6 in the upper portion of the casing 3.
  • the pressure equalization piston 10 is mounted in a guide cylmderll which can be detached from the casing 3 by removing securing bolts 20, 20.
  • the guide cylinder 11 is closed by a detachable cover 12 which mounts a drive element or motor 13 for rotating a threaded spindle 14.
  • the threaded spindle 14 is threadably engaged with the pres sure equalization piston 10 and rotation of the spindle will eiect axial movement of the pressure equalization piston within the guide cylinder 11.
  • the pressure equalization piston 10 in accordance with the invention, is located opposite the end face of the slide 7 which is charged by the discharge pressure.
  • the end face of the pressure equalization piston 10 which faces away from the slide 17 is located within the guide cylinder 11 and communicates through bores 15 in the pressure equalization piston 15 in the slide 7 to the inlet 'side so that the inlet pressure acts on the pressure equalization piston 10 and on one end of the slide 7 in the direction opposite to the outlet pressure which acts on the slide 7 and the reception piece 9 at the location of the outlet 2.
  • the reception piece 9 which is connected with this piston has a slightly smaller diameter than the pressure equalization piston itself.
  • the slide 7 alsohas a diameter which is equal to that of the reception piece '9 so that it is small enough to be removed with the equalization piston to the end of the guide cylinder after the cover 1'2 is removed.
  • the construction of the slide and the pressure equalization is such that they are charged by the inlet or discharge pressure of the throughput medium itself and in a manner such that the system is balanced. No auxiliary medium is necessary for loading of the parts in order to overcome unbalancing forces. With the construction, both the quantity of the throughput medium and also the nominal or rate of pressure ratio of ⁇ the machine can be changedy without changing the axial thrust balance of the slide.
  • a compressor comprising a housing having an inlet opening and a discharge spaced from said inlet opening, cooperative rotor means mounted in said housing between said inlet and said outlet for drawing a medium in through said inlet and discharging it out through said outlet, a slide mounted in said housing for axial movement ⁇ and having an end face communicating with said' inletand an opposite end face communicating with said outlet, said-slide being located between said rotor and said outlet and being movable to vary the ow area lfrom,
  • a pressure equalization piston in sealing engagement with said housing and connected to and movable in the same axial directions of said slide, and means for communicating the side of said piston opposite to said slide to said inlet.
  • a compressor according to claim 1, wherein said housing includes a guide cylinder extension facing away from said slide, said pressure equalization piston being movable in said guide cylinder extension, said means for communicating the side of said piston opposite to said 'slide to said inlet comprising a connecting rod extending from said slide to said pressure equalization piston and a through passage defined through said pressure equalization piston, said connecting rod and said slide to communicate said inlet to the opposite side of said pressure equalization piston from said slide.
  • a compressor according to claim 3, wherein said guide cylinder comprises a removable cylindrical extension of said housing.
  • a compressor including a motor mounted on said extension cylinder, a threaded spindle rotated by said motor, said threaded spindle being threadably engaged with said pressure equalization piston fork shifting said piston within said guide cylinder.
  • a compressor according to claim 5, wherein said pressure equalization and said slide are connected together by'a connecting rod, said connecting rod, said pressure equalization piston and said slide having a through passage therethrough for communicating the inlet side of said slide with the opposite side of said pressure equalization piston from said slide.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)
  • Rotary Pumps (AREA)
  • Rotary-Type Compressors (AREA)
  • Compressors, Vaccum Pumps And Other Relevant Systems (AREA)
US788511A 1968-01-03 1969-01-02 Screw machine Expired - Lifetime US3549280A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1628274 1968-01-03

Publications (1)

Publication Number Publication Date
US3549280A true US3549280A (en) 1970-12-22

Family

ID=5683150

Family Applications (1)

Application Number Title Priority Date Filing Date
US788511A Expired - Lifetime US3549280A (en) 1968-01-03 1969-01-02 Screw machine

Country Status (5)

Country Link
US (1) US3549280A (enrdf_load_stackoverflow)
JP (1) JPS4925734B1 (enrdf_load_stackoverflow)
FR (1) FR1600014A (enrdf_load_stackoverflow)
GB (1) GB1255971A (enrdf_load_stackoverflow)
SE (1) SE351267B (enrdf_load_stackoverflow)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3869227A (en) * 1974-03-08 1975-03-04 Vilter Manufacturing Corp Variable capacity rotary screw compressor having variable high pressure suction fluid inlets
DE3403690A1 (de) * 1984-02-03 1985-08-14 Hans-Joachim 3036 Bomlitz Cohrs Windenergiekonverterangetriebene, schiebergeregelte schraubenverdichterwaermepumpe
US4622717A (en) * 1981-12-10 1986-11-18 Hollymatic Ag. Ingenbohl Portioning machine to fill molds with plastic food material and use of same
US4678406A (en) * 1986-04-25 1987-07-07 Frick Company Variable volume ratio screw compressor with step control
US9850902B2 (en) 2009-03-26 2017-12-26 Johnson Controls Technology Company Compressor with a bypass port

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1922639A (en) * 1931-03-13 1933-08-15 Worthington Pump & Mach Corp Unloading mechanism for rotary compressors
US1948907A (en) * 1931-04-18 1934-02-27 Egli Eugen Compressor
US2079375A (en) * 1936-06-09 1937-05-04 Orla H Mccollum Pump
US2331127A (en) * 1943-10-05 Fluid pressure apparatus
US2477003A (en) * 1942-07-25 1949-07-26 Joy Mfg Co Rotary helical gear air pump with discharge pressure regulator
US3045447A (en) * 1958-02-27 1962-07-24 Svenska Rotor Maskiner Ab Rotary device, such as refrigerating machine or similar device
US3314597A (en) * 1964-03-20 1967-04-18 Svenska Rotor Maskiner Ab Screw compressor
US3432089A (en) * 1965-10-12 1969-03-11 Svenska Rotor Maskiner Ab Screw rotor machine for an elastic working medium

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2331127A (en) * 1943-10-05 Fluid pressure apparatus
US1922639A (en) * 1931-03-13 1933-08-15 Worthington Pump & Mach Corp Unloading mechanism for rotary compressors
US1948907A (en) * 1931-04-18 1934-02-27 Egli Eugen Compressor
US2079375A (en) * 1936-06-09 1937-05-04 Orla H Mccollum Pump
US2477003A (en) * 1942-07-25 1949-07-26 Joy Mfg Co Rotary helical gear air pump with discharge pressure regulator
US3045447A (en) * 1958-02-27 1962-07-24 Svenska Rotor Maskiner Ab Rotary device, such as refrigerating machine or similar device
US3314597A (en) * 1964-03-20 1967-04-18 Svenska Rotor Maskiner Ab Screw compressor
US3432089A (en) * 1965-10-12 1969-03-11 Svenska Rotor Maskiner Ab Screw rotor machine for an elastic working medium

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3869227A (en) * 1974-03-08 1975-03-04 Vilter Manufacturing Corp Variable capacity rotary screw compressor having variable high pressure suction fluid inlets
US4622717A (en) * 1981-12-10 1986-11-18 Hollymatic Ag. Ingenbohl Portioning machine to fill molds with plastic food material and use of same
DE3403690A1 (de) * 1984-02-03 1985-08-14 Hans-Joachim 3036 Bomlitz Cohrs Windenergiekonverterangetriebene, schiebergeregelte schraubenverdichterwaermepumpe
US4678406A (en) * 1986-04-25 1987-07-07 Frick Company Variable volume ratio screw compressor with step control
US9850902B2 (en) 2009-03-26 2017-12-26 Johnson Controls Technology Company Compressor with a bypass port

Also Published As

Publication number Publication date
GB1255971A (en) 1971-12-08
JPS4925734B1 (enrdf_load_stackoverflow) 1974-07-03
FR1600014A (enrdf_load_stackoverflow) 1970-07-20
SE351267B (enrdf_load_stackoverflow) 1972-11-20

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