EP0147928B1 - Horizontal shaft compressor with lubricating pump - Google Patents

Horizontal shaft compressor with lubricating pump Download PDF

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Publication number
EP0147928B1
EP0147928B1 EP84307383A EP84307383A EP0147928B1 EP 0147928 B1 EP0147928 B1 EP 0147928B1 EP 84307383 A EP84307383 A EP 84307383A EP 84307383 A EP84307383 A EP 84307383A EP 0147928 B1 EP0147928 B1 EP 0147928B1
Authority
EP
European Patent Office
Prior art keywords
crankshaft
crankcase
compressor
helical
annular chamber
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
Application number
EP84307383A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0147928A3 (en
EP0147928A2 (en
Inventor
Mark W. Wood
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.)
Tecumseh Products Co
Original Assignee
Tecumseh Products Co
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 Tecumseh Products Co filed Critical Tecumseh Products Co
Publication of EP0147928A2 publication Critical patent/EP0147928A2/en
Publication of EP0147928A3 publication Critical patent/EP0147928A3/en
Application granted granted Critical
Publication of EP0147928B1 publication Critical patent/EP0147928B1/en
Expired 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
    • F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
    • F04C29/02—Lubrication; Lubricant separation
    • F04C29/028—Means for improving or restricting lubricant flow
    • 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
    • F04B39/02—Lubrication

Definitions

  • This invention pertains to an oil pump, and more particularly to an oil pump for use in a horizontal rotary compressor.
  • the crankshaft is vertically disposed in the compressor housing and has its lower end portion submerged in an oil sump.
  • a helical groove is provided in the crankshaft, and upon rotation of the crankshaft by the motor, oil is delivered upwardly through the groove along the crankshaft for lubricating bearings and other moving parts.
  • impeller means is also provided at the lower end of the crankshaft to assist in urging oil upwardly through the helical groove.
  • DE-A-2010747 comprises the combined features of the preamble of claim 1 defining this invention and discloses an arrangement for delivering lubricant upwardly to a rotating horizontal crankshaft using a disc or plate attached to the crankshaft to rotate therewith and which has its lower portion disposed in the oil sump.
  • a circular groove is provided in the flat surfaces of the disc, and upon rotation of the crankshaft, the disc rotates through the oil sump and carries lubricant in the grooves upwardly to a cavity or chamber adjacent the crankshaft.
  • the lubricant is then delivered from the chamber by means of a series of passages to the crankshaft for lubricating bearings.
  • Another type of oil pump for use with horizontal motor-compressor units utilizes a wick device disposed in the oil sump and in contact along several axial points of the crankshaft.
  • the wick device delivers oil upwardly from the oil sump and through the wick to the crankshaft for further delivery along the crankshaft and bearings.
  • An obvious drawback with this type of oiling device is that the wick may shrink down away from the crankshaft during prolonged use, thereby preventing proper lubrication of the crankshaft and bearings.
  • small pieces of the wick may eventually break off and clog oil passages or lodge between moving parts preventing proper movement.
  • crankcase In yet another type of horizontal compressor, a portion of the crankcase is submerged in the oil sump and has a passageway leading from the oil sump upwardly to a chamber provided between an eccentric reduced portion of the crankshaft and crankcase. Rotation of the crankshaft causes oil to be drawn upwardly through the crankcase passageway into the chamber and through an axially extending passage in the crankshaft.
  • One of the problems associated with this particular type of oil is that the axially extending passage in communication with the chamber does not fully utilize the centrifugal force of the rotation crankshaft to deliver efficiently desired amounts of lubrication along the crankshaft for lubricating bearings.
  • the center portion of the shaft is enlarged and tapers radially inwardly toward the remote ends.
  • a pair of oppositely angularly disposed helical grooves are provided on the respective tapering surfaces of the enlarged center portion and have their axially outermost ends in communication with an oil supply.
  • oil is delivered axially inwardly along the grooves to the center of the shaft for lubrication thereof.
  • the oil supply is required to be disposed at the same height as the ends of the rotating horizontal shaft.
  • the crankshaft is disposed above the surface of the oil sump in the compressor housing.
  • JP-A-58133495 discloses an oil feeder for a rotary vane compressor in which a horizontal rotor has spiral grooves formed in bearing sections of the rotor shaft on both sides of the rotor which are fed with a highly viscous oil from an oil sump below the rotor.
  • the spiral grooves perform a pumping function that advances the oil along the bearing sections to the rotor.
  • This invention provides a hermetic motor compressor including; a housing having an inlet, an outlet, and an oil sump in the bottom thereof, and a motor-compressor unit mounted in said housing and including a crankcase, a rotatable crankshaft rotatably mounted in two bearings, a cylinder, and means connected to said crankshaft for compressing refrigerant, said crankshaft being generally horizontally disposed and rotatably received in said crankcase, and having a reduced diameter portion between said two bearings forming between said crankshaft and said crankcase an annular chamber; wherein said crankshaft has a helical groove arranged within one of said bearings forming between said crankshaft and said crankcase a helical passage between said annular chamber and said compressing means, a generally vertically disposed oil passageway directly connecting said oil sump with said annular chamber whereby the pressure in said oil sump when said crankshaft is rotated, said helical groove constituting the only moving means for drawing lubricant upwardly through said oil passage and
  • the horizontal shaft oil pump of the present invention overcomes the general inability of many of the prior art oil pumps to efficiently supply a requisite amount of lubricant along the horizontal crankshaft for lubricating bearings and moving parts.
  • This inability is overcome in a particular advantageous manner by providing a pair of oppositely oriented helical grooves on opposite sides of the annular chamber and which form between the crankshaft and crankcase a pair of oppositely oriented helical passages in communication with and leading away from the annular chamber.
  • the helical passages are oppositely disposed to deliver oil in opposite directions from the annular chamber.
  • the low pressure area created in the annular chamber draws lubricant from the oil sump upwardly through the crankcase passageway into the annular chamber. Lubricant is then delivered by the respective helical passages along the crankshaft for lubricating bearings and other moving parts.
  • each helical groove is such as to provide adequate oil flow for sufficient lubrication of bearings and to enable self-priming of the pump upon start-up.
  • a compressor comprising a housing having an inlet, outlet, and an oil sump in the bottom thereof.
  • a motor-compressor unit is mounted in the housing and includes a crankcase with a generally vertically disposed passageway in communication with the oil sump, rotatable crankshaft, and means for compressing refrigerant.
  • the crankshaft is generally horizontally disposed and rotatably received in the crankcase, and has a reduced diameter portion forming between the crankshaft and crankcase an annular chamber in communication with the crankcase passageway.
  • the crankshaft further includes a helical groove forming between the crankshaft and crankcase a helical passage between the annular chamber and compressing means.
  • a rotary compressor is indicated at 10 incorporating horizontal shaft oil pump 11 of the present invention.
  • horizontal shaft oil pump 11 of can also be incorporated with other types of compressors requiring lubrication of rotating horizontal shafts.
  • the motor-compressor unit 8 of rotary compressor 10 comprises motor 13 having rotor 15 and stator 14 with windings 16, and cylindrical housing 12 shrunk down on stator 14.
  • the opposite ends of housing 12 are closed by end plates 18, 20 welded thereto.
  • End plate 18 includes terminal pin assembly 22 and discharge outlet 24 having discharge tube 26 connected thereto by connector 28.
  • End plate 20 includes opening 30 through which is received suction inlet tube 32 indicated in dashed lines.
  • a pair of mounting brackets 34 are welded to the opposite ends of housing 12, and each includes a pair of support members, such as resilient grommets 36, 38.
  • crankcase 42 Mounted within interior 40 of housing 12 is crankcase 42 including main bearing block 44 having oil passageway 46 generally vertically disposed therein. Housing 12 includes oil sump 48, and the lower portion of main bearing block 44 is submerged therein to provide communication between oil passageway 46 and horizontally disposed bore 50 in crankcase 42.
  • vertical disposed as it applies to passageway 46 is to be construed broadly and means that oil must flow upwardly therein from sump 48 against the force of gravity.
  • crankshaft 52 is horizontally rotatably received in bore 50, and rotor 15 is shrunk down on portion 54 of crankshaft 52 to rotate crankshaft 52 upon application of electrical current to motor 13 through terminal pin assembly 22.
  • crankshaft 52 includes eccentric 58 having slot 59 and is received in cylinder plate 60, which is connected to main bearing block 44 by screws 66.
  • Roller 62 is rotatably received about eccentric 58 in cylinder 59, and valve plate or back plate 64 is attached to cylinder 60 by means of screws 66.
  • Discharge muffler 68 is attached to back plate'64 by screws 66, and back plate 64 includes hole 70 in axial alignment with crankshaft 52 and opening 72 in muffler 68.
  • Vane 63 is slidably received in slot 67 in cylinder plate 60 and is biased against roller 62 by C-shaped spring 65, which is secured to cylinder plate 60.
  • Cylinder plate 60 has inlet 69 with which suction inlet tube 32 communicates.
  • a valve assembly 74 permits compressed refrigerant to flow from cylinder 59 through back plate 64 and into discharge muffler 68.
  • Valve assembly 74 includes opening 76 in back plate 64 which communicates between cylinder 59 and muffler 68.
  • a leaf valve 78 is secured in place over opening 76 by valve retainer 80 and screw 82 ( Figure 2) received through valve retainer 80, valve 78, and threadedly secured in back plate 64.
  • crankshaft 52 has a reduced diameter center portion 84 which forms annular chamber 86 between crankshaft 52 and crankcase 42, annular chamber 86 communicating with oil passageway 46. Disposed in crankshaft 52 are a pair of helical grooves 88, 90 on opposite sides of and in communication with annular chamber 86.
  • grooves 88 and 90 are oppositely oriented in crankshaft 52 to deliver lubricant from annular chamber 86 in opposite directions along crankshaft 52.
  • the radial dimension or depth and the axial dimension or length of each groove -88, 90 is predetermined as a function of several variables, among which are the diameter and length of the crankshaft, the vertical height of the crankshaft above the oil sump, and the like.
  • Grooves 88,90 are machined in crankshaft 52 to provide sufficient bearing surface between ridges 92 and the inner surface of crankcase bore 50, while at the same time efficiently supplying a desired amount of lubricant along crankshaft 52.
  • each groove 88, 90 has a bottom surface 94 with upwardly extending sides 96, 98 which diverge radially outwardly from bottom surface 94 to ridges 92 for ease of machining.
  • crankshaft 52 Given in the following are dimensions of a typical working embodiment of crankshaft 52 in the present invention, and are exemplary only and do not limit the scope of the invention: Compressor power:
  • crankshaft 52 lubrication is provided as soon as crankshaft 52 is rotated.
  • the rotation of crankshaft 52 creates a partial vacuum or low pressure area in annular chamber 86 which draws lubricant upwardly from oil sump 48 through oil passageway 46 into chamber 86.
  • lubricant is delivered in opposite directions by helical passages 100, 102.
  • Lubricant is discharged from helical passage 100 on to rotor 56, which will throw the lubricant outwardly against the inner surface of housing 12 for cooling and return to oil sump 48.
  • Lubricant delivered by helical passage 102 lubricates bore 50 of crankcase 42, and exits passageway 102 through slot 59 in eccentric 58.
  • Lubricant delivered to slot 59 lubricates the mutually engaging surfaces of eccentric 58 and roller 62. From slot 59, lubricant is then delivered through hole 70 in back plate 64 and opening 72 in discharge muffler 68 for return to oil sump 48.
  • an outboard bearing (not shown) may be provided with eccentric 58 to rotate within bore 70 in back plate 64. Any such outboard bearing may include an oil passage in communication with slot 59 in eccentric 58 to deliver lubricant through the outboard bearing and to oil sump 48.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)
  • Compressor (AREA)
EP84307383A 1983-11-29 1984-10-26 Horizontal shaft compressor with lubricating pump Expired EP0147928B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US55608483A 1983-11-29 1983-11-29
US556084 1983-11-29

Publications (3)

Publication Number Publication Date
EP0147928A2 EP0147928A2 (en) 1985-07-10
EP0147928A3 EP0147928A3 (en) 1987-05-06
EP0147928B1 true EP0147928B1 (en) 1989-12-13

Family

ID=24219838

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84307383A Expired EP0147928B1 (en) 1983-11-29 1984-10-26 Horizontal shaft compressor with lubricating pump

Country Status (11)

Country Link
EP (1) EP0147928B1 (ja)
JP (1) JPS60119388A (ja)
KR (1) KR870000135B1 (ja)
AU (1) AU560777B2 (ja)
BR (1) BR8405981A (ja)
CA (1) CA1221070A (ja)
DE (1) DE3480728D1 (ja)
IN (1) IN162764B (ja)
MX (1) MX162760A (ja)
SU (1) SU1482537A3 (ja)
ZA (1) ZA847737B (ja)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6487894A (en) * 1987-09-30 1989-03-31 Hitachi Ltd Scroll compressor
JPH01167488A (ja) * 1987-12-21 1989-07-03 Daewoo Electronics Co Ltd 水平形回転式圧縮機の給油構造
RU2578487C1 (ru) * 2014-10-14 2016-03-27 Юрий Андреевич Гребнев Бесшатунный мотор-компрессор
DE102017220437B8 (de) 2017-11-16 2019-06-19 Eagleburgmann Germany Gmbh & Co. Kg Pumpenanordnung, insbesondere zur Versorgung einer Gleitringdichtungsanordnung
EP3514384A1 (de) * 2018-01-19 2019-07-24 Nidec Global Appliance Germany GmbH Kurbelwelle

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3513476A (en) * 1967-06-21 1970-05-19 Tokyo Shibaura Electric Co Rotary compressors
FR1554858A (ja) * 1967-12-11 1969-01-24
US3499600A (en) * 1968-03-21 1970-03-10 Whirlpool Co Rotary compressor
US3630316A (en) * 1969-03-07 1971-12-28 Necchi Spa Lubricating device for enclosed motor compressor units
JPS58133495A (ja) * 1982-02-02 1983-08-09 Matsushita Electric Ind Co Ltd ベ−ン回転式圧縮機の油供給装置

Also Published As

Publication number Publication date
CA1221070A (en) 1987-04-28
DE3480728D1 (de) 1990-01-18
MX162760A (es) 1991-06-25
JPS60119388A (ja) 1985-06-26
KR850003947A (ko) 1985-06-29
ZA847737B (en) 1985-05-29
IN162764B (ja) 1988-07-09
EP0147928A3 (en) 1987-05-06
AU3588284A (en) 1985-06-06
KR870000135B1 (ko) 1987-02-12
SU1482537A3 (ru) 1989-05-23
BR8405981A (pt) 1985-08-27
EP0147928A2 (en) 1985-07-10
AU560777B2 (en) 1987-04-16
JPS6339797B2 (ja) 1988-08-08

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