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
  • F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
  • F04C18/02—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents
• • 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
  • F04C29/06—Silencing
  • F04C29/068—Silencing the silencing means being arranged inside the pump housing
• • 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
  • F04C23/00—Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids
  • F04C23/008—Hermetic pumps

Definitions

• the present invention relates to a scroll-type electric compressor used as a refrigerant compressor or an air compressor for refrigeration and air conditioning.
• a stator 104 of a motor 103 for driving a compression mechanism 102 is fixed inside a closed container 101, and a rotor of the motor 103 is fixed.
• a crankshaft 106 for driving a compression mechanism 102 is connected to 105, and a lower portion of the sealed container 101 is a lubricating oil reservoir 107.
• Compression mechanism 102 Fixed swirl vane member 110 integrally formed with fixed swirl vane 109 on fixed frame 108, and swirl swirl vane 111 that engages with fixed swirl vane 109 to form a plurality of compression work spaces 114.
• the swing drive shaft 116 provided on the opposite side of the blade 111 and the eccentric bearing 118 provided inside the main shaft 117 formed at one end of the crank shaft 106 are fitted into the crank shaft 106. It is supported by a main bearing member 120 having a main bearing 119 that supports the main shaft 117 and an upper bearing member 122 having a slide-shaped upper bearing 121 that supports an end of the crankshaft 106 on the opposite side of the main shaft. .
• the thrust bearing 123 fixed to the main bearing member 120 supports the turning head plate 112 in the axial direction.
• Refrigerant drawn from compressor suction pipe 124 The gas enters the compression mechanism 102 from the suction port 125 of the gas compression mechanism 102, is compressed in the compression work space 114, is discharged from the discharge port 126 through the discharge chamber 127, passes through the discharge pipe 128, and is discharged out of the compressor.
• Japanese Unexamined Patent Publication No. 1-177482 Japanese Unexamined Patent Publication No. 1-177482.
• Rolling bearings Compared to plain bearings, they can receive both radial and axial loads at the same time, and can be lubricated even with a small amount of lubricating oil.Flexibility in assembly accuracy and oil lubrication Can be provided. (JP-A-1-170779, JP-A-58-172485, JP-A-62-253982, etc.). However, there is a big problem that rolling Ik noise is generated due to vibration and resonance in the rolling bearing axial direction.
• a first object of the present invention is to improve vibration noise characteristics, and further to improve reliability and performance. Further, a second object of the present invention is to prevent the rolling-type upper bearing from being damaged due to dropping and transportation.
• an electric motor is provided in an upper portion of a closed container and a compression mechanism driven by the electric motor is provided in a lower portion thereof, and the compression is performed.
• the mechanism is a fixed spiral blade member having a fixed spiral blade formed on a fixed frame body, and a swirl having a swirl spiral blade formed on a swivel head plate which meshes with the fixed swirl blade to form a plurality of working spaces.
• a turning drive shaft formed on the opposite side of the turning end plate from the turning spiral blade is fitted into an eccentric bearing provided eccentrically inside the main shaft of the crank shaft.
• a restraining plate is arranged and fixed, and the coupling portion with the above-mentioned rotor is made thicker than the fitting portion with the above-mentioned upper bearing so as to have a stepped shape.
• a configuration is adopted in which the center of the rotor of the electric motor is shifted above the center of the stator. Things.
• the inner ring of the upper bearing and the support surface of the support member are bonded and fixed.
• the fourth means of the present invention for achieving the second object is, in addition to the first, second, and third means, an axial direction.
• the elastic member is held by the inner ring end surface of the upper bearing and the holding member. Holding member It is configured to be lifted and fixed by a fixing member.
• the initial lifting amount of the crank shaft is smaller than the elastic deflection amount of the elastic member due to a limit load of the upper bearing. This is the configuration that was adopted.
• a stepped shape in addition to the fourth and fifth means of the present invention, a stepped shape in which a portion above a fitting portion of the crankshaft with the upper bearing is narrowed.
• the support member is fitted and abutted on the stepped surface B, and the elastic member is subjected to initial deformation by the support member and the holding member, and the holding member is fixed to the crank shaft.
• the crank shaft is held by a member, and the crank shaft is lifted and supported on the inner ring surface of the upper bearing by the negative support member.
• FIGS. 1 and 2 are cross-sectional views of a conventional scroll compressor.
• FIG. 3 is a scroll compressor showing a first embodiment of the present invention.
• FIG. 4 is a partial sectional view of a scroll compressor showing a second embodiment of the present invention.
• FIG. 5 is a partial sectional view of a scroll compressor showing a third embodiment of the present invention.
• Cross section IE Fig. 6 is a partial cross section of a scroll compressor showing a fourth embodiment of the present invention
• FIG. 10 is an enlarged sectional view of a part incorporating a wave washer.
• FIG. 3 a stator 4 of a motor 3 for driving a compression mechanism 2 is fixed inside a closed container 1, and a crank shaft 6 for driving the compression mechanism 2 is coupled to a rotor 5 of the motor 3.
• the lower part of the closed container 1 is a lubricating oil reservoir 7.
• Compression mechanism 2 (a fixed swirl blade member 10 in which fixed swirl blade 9 is integrally formed with fixed frame 8 and a swivel that engages with fixed swirl blade 9 to form a plurality of compression work spaces 14 It has a swirling blade member 13 in which the swirling blade 11 is formed on a rotating head plate 12, and a rotation restricting member 15 which prevents the swirling blade member 13 from rotating and only rotates.
• Slewing drive shaft 16 provided on the opposite side of swirling vanes 11 of swivel head plate 12 (fitted into eccentric bearing 18 provided inside main shaft 17 formed at one end of crank shaft 6)
• the crankshaft 6 has a main bearing member 20 having a main bearing 19 for supporting the main shaft 17 and a crankshaft opposite to the main shaft 17.
• the shaft 6 is supported by an upper bearing member 22 having a slide-shaped upper bearing 21 that supports the end of the shaft 6.
• a supranational control plate 24 for preventing excessive lifting of the crank shaft 6 above is provided and fixed to and integrated with the upper bearing member 22; ⁇
• the crank shaft 6 is lifted and fixed by a retaining ring 26 to a support member 25 supported on an end face of the inner ring 23 of the upper bearing 21, and the crank shaft 6 3 ⁇ 4 the rotor 5
• a minute gap 28 is secured between the stepped surface A 27 of the fitting portion of the upper bearing 21 and the portion where the upper bearing 21 is joined with the floating suppressing plate 23.
• an axial direction limiting plate 29 for limiting the movement of the swirling spiral blade member 13 in the axial direction at a small gap from the back of the turning head plate 12 is integrated with the main bearing member 20.
• the back surface of the revolving head plate 12 is slidable with the back surface, the discharge pressure acts on the center of the back surface, and the lower back pressure pressure acts on the back pressure chamber 31 on the outer periphery.
• An annular back pressure partition 30 for partitioning is provided.
• the refrigerant gas sucked from the suction pipe 32 of the compressor enters the compression mechanism 2, is compressed in the compression work space 14, is discharged from the discharge port 33, passes through the discharge chamber 34, passes through the discharge pipe 35, and is discharged out of the compressor.
• the inner ring 23 of the upper bearing 21 acts as a preload in the axial direction via the own weight i support member 25 of the crankshaft system.
• the preload increases the rigidity of the bearing, and the durability is problematic, especially at high speeds.
• the refrigerant gas containing the lubricating oil passes around the upper bearing 21.
• the upper bearing 21 is devised to be lubricated, a decrease in durability can be prevented.
• the elastic member for biasing elastic force in the axial direction The buckle 38 is disposed on the inner ring 23 of the upper bearing 21, and the buckle 38 is held by the holding member 39.
• the crank shaft 6 is lifted and fixed to the holding member 39 by the retaining ring 26, and is supported by the end surface of the inner ring 23 of the upper bearing 21 via the wave sash 38.
• the elasticity of the wave sash 38 makes it possible to prevent the upper part from being dropped and transported. Since the impact on the bearing 21 is reduced, the protective effect of the upper bearing 21 can be obtained. Further, a fifth embodiment of the present invention will be described with reference to FIG.
• the initial lifting amount 40 of the crankshaft 6 is set to be smaller than the elastic bending amount 41 due to the limit load of the upper bearing 21 of the waver 38.
• the lifting amount of the crankshaft 6 is reduced before the impact force caused by dropping and transport exceeds the limit load of the upper bearing 21.
• the impact is received on the thrust surface 42 on the main shaft 17 side of the crank shaft 6, so that the upper bearing 21 does not receive an impact force exceeding the limit load.
• the protection of the upper bearing 21 is completed.
• crank shaft 6 is formed in a stepped shape in which a portion above the fitting portion with the upper bearing 21 is made thinner, and the supporting member 25 is fitted into and abutted on the stepped surface B 43.
• Waveform 38 (before the initial deformation is given by the support member 25 and the holding member 39, It is fixed to the crank shaft 6 with a retaining ring 26.
• the crankshaft 6 (supported by the support member 25 so as to be suspended from the end surface of the inner ring 23 of the upper bearing 21.
• a method of imparting initial deformation to the waver 38 will be described in more detail.
• an enlarged view of the assembled part of the undulation is shown in Fig. 10.
• a undulation 38 is arranged on the upper surface of the support member 25, and the holding member is arranged axially from above. 39 is pressed into contact to apply the initial deformation to the above-mentioned wave cache 38, and is fixed to the crank shaft 6 by the retaining ring 26.
• the wave hash 38 is deformed in advance, If a load greater than the weight of the crankshaft system is applied, the wavewasher will not receive a load greater than the weight of the crankshaft system during normal operation.
• the fourth and fifth embodiments In addition to the impeachment of the impeachment, the vibration noise is further improved.
• the case where the crank shaft 6 is lifted and fixed ⁇ the retaining ring 26 is used has been described.
• Fixing elements that are not easily removed are not particularly limited as long as they are bolts, etc.
• the elastic member is a wave washer. There is no particular limitation unless the elastic limit is exceeded within the limit load of the upper bearing 21.
• the present invention is applied to the inner ring of the rolling type upper bearing as a preload in the axial direction via the self-gravity supporting member of the crankshaft system.
• Abnormal noise generated from the upper bearing due to axial vibration and resonance can be prevented as well as excessive floating above the crankshaft due to falling and transportation. This can be prevented by the stepped surface A of the rank shaft coming into contact with the floating suppression plate.
• the entire thrust of the crankshaft system is supported only by the rolling type upper bearing, the sliding loss due to the thrust force can be reduced.
• a magnetic attraction force is generated in the crankshaft system due to the displacement of the magnet center between the rotor and the stator of the motor, so that the weight of the crankshaft system is regarded as its own weight.
• the magnetic attraction also acts as a preload on the inner ring of the upper bearing. This further enhances the effect of preventing abnormal noise and the like generated from the upper bearing.
• the inner ring of the upper bearing and the support surface of the support member are bonded and fixed by bonding means to prevent slippage between the inner ring of the upper bearing and the crank shaft. In addition, wear of the fitting surface between the crankshaft and the upper bearing can be prevented, thereby improving reliability.
• the impact force on the upper bearing caused by dropping and transportation is reduced, so that the protective effect of the upper bearing can be obtained.
• the initial lifting amount of the crank shaft is smaller than the elastic deflection of the upper bearing due to the limit load of the elastic member.
• the lifting amount of the crankshaft was reduced and the crankshaft will receive the impact force.
• the upper bearing will not receive an impact force exceeding its limit load.
• complete protection of the upper bearing by applying a load greater than the weight of the crankshaft system by deforming the elastic member in advance, the elastic member does not receive a load greater than the weight of the crankshaft system during normal operation.
• the member does not act as an elastic body; consequently, it does not resonate with the operating frequency, resulting in better vibration noise. Due to the above effects, A scroll compressor with excellent sound characteristics and improved reliability and performance can be provided.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Rotary Pumps (AREA)
• Applications Or Details Of Rotary Compressors (AREA)

Priority Applications (3)

Applications Claiming Priority (2)

Publications (1)

Family

ID=17711929

Family Applications (1)

Country Status (4)

Cited By (2)

Citations (3)

• 1989
  • 1989-11-02 JP JP1287015A patent/JP2543206B2/ja not_active Expired - Fee Related
• 1990
  • 1990-11-02 KR KR1019910700671A patent/KR950004543B1/ko not_active Expired - Fee Related
  • 1990-11-02 WO PCT/JP1990/001417 patent/WO1991006769A1/ja active Application Filing
  • 1990-11-02 DE DE19904092015 patent/DE4092015T/de active Pending

Patent Citations (3)

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