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
  • F04B39/02—Lubrication
  • F04B39/0223—Lubrication characterised by the compressor type
  • F04B39/023—Hermetic compressors
  • F04B39/0238—Hermetic compressors with oil distribution channels
  • F04B39/0246—Hermetic compressors with oil distribution channels in the rotating shaft
  • F04B39/0253—Hermetic compressors with oil distribution channels in the rotating shaft using centrifugal force for transporting the oil
• • 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
  • F04B39/0223—Lubrication characterised by the compressor type
  • F04B39/023—Hermetic compressors
  • F04B39/0238—Hermetic compressors with oil distribution channels
  • F04B39/0246—Hermetic compressors with oil distribution channels in the rotating shaft

Definitions

• This invention relates to a compressor wherein means are provided to improve the lubrication of moving parts.
• hermetic piston compressors preferably utilized in cooling devices
• lubrication is necessary in order to prevent the moving parts from being affected by friction during operation.
• the lubrication of the bearings in which the moving parts move is usually achieved by the crankshaft rotation at high revolutions.
• the lubrication is performed by conveying the oil inside the outer shell of the compressor by means of the oil suction pipe located below the crankshaft. Utilizing the oil inside the compressor, it is achieved to both lubricate the bearings and also to discharge the heat inside the compressor via the upper casing.
• designing the bearings correctly affects the compressor efficiency and life span directly.
• the aim of the present invention is the realization of a compressor wherein means are provided to improve the lubrication of moving parts at the startup.
• the cooling device realized in order to fulfill the object of the present invention is explicated in the first claim wherein other features are described in the dependent claims.
• part of the oil sucked via the suction channel is transferred to the bearing in which the crankshaft moves, by means of a hole on the suction pipe and of a groove located on the outer surface of the crankshaft whereas the other part is transferred to a chamber.
• the oil reaches the oil transfer channel and is able to climb up to the uppermost portions of the compressor.
• the other part of the oil passes to the transfer channel via the transfer channel inlet corresponding to the front of the suction channel and climbs up to the upper portions together with the oil coming from the groove.
• the chamber is divided into compartments.
• the oil flowing to the chamber leaks from one compartment to another via a passage located below the level of the suction channel outlet of the separator, until the oil level in the compartments at the two sides of the separator is equalized. If the oil rises above the suction pipe, excess oil returns back to the interior of the casing via the suction channel. Thereby, it is achieved that some amount of oil is left inside the chamber when the crankshaft stops moving and at the next startup of the crankshaft the initial oil necessary for the bearing and the crankshaft is easily supplied.
• the crankshaft incorporates a suction channel positioned inside the suction pipe eccentrically with respect to the middle axis wherein the amount of the oil that is transferred to the bearings via the suction channel positioned eccentrically with respect to the middle axis and the oil suction pipe and thus the efficiency of the compressor is increased.
• Increasing the flow rate of the oil pumped by the suction pipe causes the inner temperature of the compressor casing and thus the temperature of the entering gas sucked to the cylinder to decrease, improving the thermodynamic efficiency of the compressor.
• by supplying the bearings with oil rapidly at startup wear at startup is prevented.
• variable capacity compressors which may be operated at various speeds determined according to capacity needs, oil may be transferred to the bearings both at high and low speeds, improving the efficiency.
• oil may be transferred to the bearings both at high and low speeds, improving the efficiency.
• Fig.l - is a schematic view of a compressor.
• Fig.2 - is a perspective view of a crankshaft.
• FIG.3 - is a perspective view of a crankshaft incorporating a transfer channel, a chamber and a suction channel at its inner portion.
• Fig.4 - is a schematic view of detail D of a crankshaft.
• the cycling of the circulation fluid used for cooling purposes is achieved by means of a compressor (1).
• the compressor (1) comprises a motor (2) and a crankshaft (5) transferring the motion of the motor (2).
• Inside the compressor (1) preferably there is provided a fluid by which the motion of the operating parts is facilitated and the heat generated inside is transferred. In the preferred embodiment, liquid oil is utilized as the fluid.
• the crankshaft (5) incorporates a suction pipe (12) fastened to its lower portion whereby oil is sucked and transferred to the upper portions as the pipe (12) moves together with said crankshaft (5) and, a suction channel (11) located inside the suction pipe (12), preferably in a straight cylindrical form whereby the oil sucked is transferred upwards.
• the crankshaft (5) further comprises a chamber (14) in communication with the suction channel (11), in which the oil sucked via the suction channel (11) accumulates, a groove (17), preferably in helical form, located on the outer surface of the crankshaft (5), providing the oil actuated by the rotary motion to rise and proceed therein, a transfer channel (3) whereby the oil that accumulates inside the chamber (14) and the oil that is transferred by means of said groove (17) is conveyed to upper portions, at least one groove inlet (15) whereby part of the oil coming from the suction channel (11) is transferred to the groove (17) before reaching the chamber (14), a groove outlet (16) connecting the groove (17) and the transfer channel (3) and used to transfer the oil to the transfer channel (3) and, a transfer channel inlet (13) in communication with the chamber (14), whereby the oil inside the chamber (14) is transferred to the transfer channel (3).
• the chamber (14) incorporates at least one separator (4) which is used to divide the chamber (14) into more than one compartment and whereby the oil flowing therein is accumulated and, at least one passage (6) which is located at the lower-most portion of the separator (4) such that the oil accumulated inside the chamber (14) can easily pass between the compartments and which is sized so as to prevent the oil from being rapidly discharged by controlling the flow rate as the oil passes from one compartment to another.
• the passage (6) is positioned at a level lower than the end of the suction channel (11), which is communicating with said chamber (14).
• the chamber (14) that is divided into two compartments by the separator (4) comprises an accumulation compartment (7) in communication with the suction pipe (14) and a reservoir (9) into which the oil transferred to the accumulation compartment (7) passes by leaking through the passage (6) and wherein said oil is preserved when the crankshaft (5) does not move.
• the crankshaft (5) further comprises a suction channel (11), preferably in form of a straight cylinder, which is positioned inside the suction pipe (12) close to the lateral walls, said suction channel (11) being eccentrically located with respect to the middle center of the suction pipe (12).
• a suction channel (11) is eccentrically positioned with respect to the middle axis of the suction pipe (12) and the crankshaft (5), the centrifugal effect on the oil suction generated by the motion of the crankshaft (5) is increased. That situation causes the velocity components of the fluid at the inlet cross- section in radial direction to be large.
• the radial velocity components of the fluid hitting to the inner wall of the crankshaft (5) transform into axial velocity components. Since the radial velocity component is increased particularly at the inlet cross-section, it is achieved that the oil is elevated more rapidly and thus that the amount of oil sucked is increased.
• crankshaft (5) incorporating a suction channel (11) in form of a straight cylinder is utilized.

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

Applications Claiming Priority (2)

Publications (2)

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ID=37772848

Family Applications (1)

Country Status (5)

Cited By (1)

Families Citing this family (2)

Family Cites Families (5)

• 2006
  • 2006-11-29 DK DK06819841T patent/DK1954944T3/da active
  • 2006-11-29 DE DE602006004621T patent/DE602006004621D1/de not_active Expired - Fee Related
  • 2006-11-29 AT AT06819841T patent/ATE419463T1/de not_active IP Right Cessation
  • 2006-11-29 EP EP06819841A patent/EP1954944B1/fr not_active Not-in-force
  • 2006-11-29 WO PCT/EP2006/069070 patent/WO2007063077A1/fr active Application Filing

Non-Patent Citations (1)

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