US1616987A - Three-step clearance control - Google Patents

Three-step clearance control Download PDF

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Publication number
US1616987A
US1616987A US127059A US12705926A US1616987A US 1616987 A US1616987 A US 1616987A US 127059 A US127059 A US 127059A US 12705926 A US12705926 A US 12705926A US 1616987 A US1616987 A US 1616987A
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United States
Prior art keywords
compressor
clearance
cylinder
valves
chambers
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Expired - Lifetime
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US127059A
Inventor
Prellwitz William
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Ingersoll Rand Co
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Ingersoll Rand Co
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Priority to US127059A priority Critical patent/US1616987A/en
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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
    • F04B49/16—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 adjusting the capacity of dead spaces of working chambers

Definitions

  • This invention relates to compressor unloaders, but more particularly to a clearance unloader which unloads and loads in three steps, that is, full load, half load and no load, considering the full loadcondition as one of the three steps.
  • the object of the invention is to enable a compressor to be unloaded entirely by clearance chambers, but in few steps and throughout each step pressure at each end of the cylinder is substantially the; same and the compressor is maintained in balanced condition.
  • the cylinder A 0 having the piston B receives air through the intake C and discharges it through the dis charge outlet D to the receiver E,
  • the cylinder is provided with four clearance chambers F,'G, H and J, so that by opening the chambers F and G. simultaneously at opposite ends of the cylinder, the compressor is half unloaded in one step and by opening the chambers H and .J simultaneously at opposite ends of the cylinder, the compressor runs under no loadias the final step.
  • the compressor has the usual inlet and discharge valves K and L which may be of the plate type.
  • the clearance chambers are provided withthe. clearance valves 0, P, Q, and R and valved ening mechanism comprising the pistons operating in the cylinders T and having the retracting springs U.
  • the regulationfiseffected by a suitable regulator and a simplet e of regulator is 4 shown comprising a cylin er V. having-Lethe piston W which. is subjected to receiver pressure at oneend through'the pipe Xand is provided with 'an' adjustable retracting sprlngY at the other end.
  • the piston is 15 cut away at a to cooperate with the ports I) and c in the cylinder V.
  • a compressor unloader the combination of a cylinder and p1ston, 1nlet and chscharge valves, a receiver, two clearance chambers and clearance valves for each end of the cylinder, and automatic means responsive to receiver pressure for operating the clearance valves in successive pairs, to first partially unload the compressor and then wholly unload the compressor, thereby keeping the compressor balanced.
  • valves of each pair being located at opp0-.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Compressors, Vaccum Pumps And Other Relevant Systems (AREA)

Description

' 1,616,987 1927' v w. PRELLWITZ THREE-STEP CLEARANCE CONTROL Filed Aug. 4, 1926' IN V EN TOR.
Y wuu mp Juli/9. 311% H15 ATTO I EY,
Patented Feb. 8, 19 27.- UNITED, STATES PATENT 'orrlc WILLIAM PRELLWITZ, OF EASTON, PENNSYLVANIA A SSIGNOR TO INGERSOLL-RAND COMPANY, OF JERSEY CITY, JERSEY, A CORPORATION OF NEW- JERSEY.
THREE-STEP CLEARANCE CONTROL;
Application filed Auggst 4, 1926. Serial m. 127,059.
This invention relates to compressor unloaders, but more particularly to a clearance unloader which unloads and loads in three steps, that is, full load, half load and no load, considering the full loadcondition as one of the three steps. j
The object of the invention is to enable a compressor to be unloaded entirely by clearance chambers, but in few steps and throughout each step pressure at each end of the cylinder is substantially the; same and the compressor is maintained in balanced condition.
The invention is illustrated in one of its preferred forms in the accompanying drawing which is a diagrammatic representation partly ,in longitudinal section of a simple unloadin system.
Referring to the drawings, the cylinder A 0 having the piston B receives air through the intake C and discharges it through the dis charge outlet D to the receiver E, The cylinder is provided with four clearance chambers F,'G, H and J, so that by opening the chambers F and G. simultaneously at opposite ends of the cylinder, the compressor is half unloaded in one step and by opening the chambers H and .J simultaneously at opposite ends of the cylinder, the compressor runs under no loadias the final step.
The compressor has the usual inlet and discharge valves K and L which may be of the plate type. The clearance chambers are provided withthe. clearance valves 0, P, Q, and R and valved ening mechanism comprising the pistons operating in the cylinders T and having the retracting springs U. The regulationfiseffected by a suitable regulator and a simplet e of regulator is 4 shown comprising a cylin er V. having-Lethe piston W which. is subjected to receiver pressure at oneend through'the pipe Xand is provided with 'an' adjustable retracting sprlngY at the other end. The piston is 15 cut away at a to cooperate with the ports I) and c in the cylinder V. Pipes 1 joining together and leading froin-the port I), sup-' ply pressure to thegcylinders T of the clear- 'ance valves 0 and P, while i ing' togetherandleading from the port a, supply pressure to .thecylinders T of the clearance valvesQ and R.
, ,In theoperationof the device',.iwhen-.the piston'Wof the regulator is moved'the first step to the left as the figure is viewed, then I pipes 2 join the port 6 is uncovered and subjected to re- 1. In a compressor unloader, the combination of a cylinder and piston, inlet and nation of a cylinder and piston, inlet and discharge valves, a receiver, tW.o clearance chambers and clcaran'cevalves for each end of the cylinder, and means for operating the clearance chambers in successive-pairs, to first partially unload the compressor and then wholly unload'the compressor.
3. In a compressor unloader, the combination of a cylinder and p1ston, 1nlet and chscharge valves, a receiver, two clearance chambers and clearance valves for each end of the cylinder, and automatic means responsive to receiver pressure for operating the clearance valves in successive pairs, to first partially unload the compressor and then wholly unload the compressor, thereby keeping the compressor balanced.
4 In a compressor unloader, the combi-- nation of acylinder and .piston, inlet and discharge valves, a receiver, two clearance chambers and clearance valves for each end of the cylinder, and automatic means responsive to receiver pressure for operating the clearance valves in successive pairs, the
valves of each pair being located at opp0-.
site'ends'of the cylinder, for efiecting steps of unloading, thereby keeping the pressures at each end of the cylinder substantially the same and maintaining a balanced condition in the compressor.
In testimony whereof I- have signed this specification;
WILLIAM PBELLWITZ
US127059A 1926-08-04 1926-08-04 Three-step clearance control Expired - Lifetime US1616987A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4714066A (en) * 1980-08-14 1987-12-22 Jordan Robert D Fuel injector system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4714066A (en) * 1980-08-14 1987-12-22 Jordan Robert D Fuel injector system

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