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
  • F04C27/00—Sealing arrangements in rotary-piston pumps specially adapted for elastic fluids
  • F04C27/005—Axial sealings for working fluid
• • 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

Definitions

• the present invention relates to a scroll compressor.
• the back pressure partition 2 1 (a lubricating oil force having a pressure equal to the discharge pressure of the compression mechanism acting on the center side of the back surface of the swivel end plate 11 ⁇ a bearing that accommodates the back pressure partition 21) By flowing into the back pressure partition band receiving groove 22 formed in the member, it is pressed against the back surface of the turning head 11.
• the back pressure divider band force tends to become unstable, especially immediately after starting or depending on operating conditions, and the back pressure divider band is pressed against the back of the turning head plate. Without this, lubricating oil with excessive pressure flows into the back pressure chamber, which increases power loss due to sliding of the rotating end plate, reduces the efficiency of the compressor, and also reduces reliability. It is.
• the present invention solves the above-mentioned problems.
• the back pressure partitioning band operates so as to be constantly pressed against the rear surface of the turning head plate in a stable state.
• the discharge pressure of the compression mechanism acts on the center side of the back of the cylinder, and an appropriate intermediate pressure between the discharge pressure and the suction pressure acts on the outside of the compression mechanism, with the aim of realizing stable operation.
• a spring member is provided between the back pressure partition and a ring-shaped groove formed in a bearing member for accommodating the back pressure partition so that the back pressure partition is always pressed against the back surface of the turning head plate.
• a ring-shaped member is provided between the spring member and the back pressure partition band in order to make the force of the spring member pressing the back pressure partition band uniform.
• the lubricating oil having a pressure equal to the discharge pressure of the compression mechanism acting on the center of the back surface of the turning head plate more reliably flows into the groove formed in the bearing member accommodating the back pressure partition band.
• a step is provided between the inner and outer axial support portions of a groove formed in a bearing member accommodating the back pressure partition so as to be pressed against the back surface of the turning head plate.
• FIGS. 5 and 6 are longitudinal sectional views of another embodiment of the back pressure divider band.
• FIG. 2 is a longitudinal section El of the scroll compressor according to one embodiment of the present invention.
• FIG. 3 is an enlarged view of a compression mechanism of the compressor.
• a stator 4 of an electric motor 3 for driving a compression mechanism 2 is fixed inside the closed casing 1, and a crank shaft 6 for driving the compression mechanism 2 is connected to a rotor 5 of the motor 3.
• the compression mechanism 2 includes a fixed scroll 8 on a fixed frame 7, and a swiveling scroll blade 10 that engages with the fixed scroll 8 to form a plurality of compression work spaces 12.
• a turning scroll 9 formed on a turning head plate 11 and an Oldham ring 13 that prevents the turning scroll 9 from rotating and only turns.
• the turning drive shaft 14 provided on the side opposite to the blades 10 and the eccentric bearing 16 provided inside the main shaft 15 formed at one end of the crank shaft 6 are inserted into the crank shaft 6. Is supported by a bearing member 18 having a main bearing 17 for supporting the main shaft 15.
• the back surface of the turning head plate 11 is slidable with the back surface of the turning head plate 11 to block the minute gap 19, and the discharge pressure of the compression mechanism 2 acts on the center side of the back surface of the turning head plate 11, and the outer side thereof is
• a ring-shaped back pressure partition 21 is provided in the back pressure chamber 20 so as to apply an appropriate intermediate pressure between the discharge pressure and the suction pressure.
• a spring member 23 that presses the back pressure partition band 21 against the back surface of the revolving end plate 11 is provided between the back pressure partition band 21 and a groove 22 formed in the bearing member 18. .
• the pressure of the back pressure chamber 20 is determined by minute holes and gaps communicating with the back pressure chamber 20. Refrigerant sucked from the suction pipe 26 of the compressor, enters the compression mechanism 2 from the suction inlet 27 of the compression mechanism 2, and is compressed and discharged in the compression work space 12 From the outlet 28, it enters the discharge space 29 provided in the lower part of the compression mechanism 2, passes through the discharge communication hole 30 penetrating the fixed frame 7 and the outer periphery of the bearing member 18, passes through the space in the sealed container, and It is discharged outside the compressor from 31.
• the refrigerant sucked in from the suction port 27 of the compression mechanism 2 is sequentially compressed in the compression work space 12 and discharged from the discharge port 28.
• an axial thrust force is applied from the compression work space 12 to the turning head 11 of the turning scroll 9, so that the rear surface of the turning head 11 is pressed by the axial support 24 of the bearing member 18.
• the minute gap 19 on the back side of the revolving head plate 11 is partitioned by a back pressure partition band 21, the discharge pressure of the compressor mechanism 2 acts on the center side, and the discharge pressure and suction pressure on the outside.
• FIG. 5 shows a second embodiment of the present invention.
• the spring member 23 is The force pressing the back pressure partition 21 acts uniformly.
• FIG. 6 shows a third embodiment of the present invention, in which a shaft accommodating the back pressure partition 21 is shown.
• the back pressure partitioning band is always pressed against the back surface of the turning head plate by the spring member and acts on the center side of the turning head plate immediately after start-up or irrespective of operating conditions.
• the axial pressure added to the swivel head of the swivel scroll from the compression working space by the discharge pressure of the air and the appropriate intermediate pressure between the discharge pressure and the suction pressure acting on the outside. Alleviates the lasting force, reduces power loss due to sliding on the plane of the revolving head, and improves the efficiency of the compressor.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Rotary Pumps (AREA)

Priority Applications (1)

Applications Claiming Priority (2)

Publications (1)

Family

ID=17711986

Family Applications (1)

Country Status (4)

Cited By (1)

Families Citing this family (5)

Citations (3)

Family Cites Families (6)

• 1989
  • 1989-11-02 JP JP1287019A patent/JPH03149382A/ja active Pending
• 1990
  • 1990-11-02 KR KR1019910700686A patent/KR920701685A/ko not_active Ceased
  • 1990-11-02 DE DE19904092013 patent/DE4092013T1/de not_active Withdrawn
  • 1990-11-02 WO PCT/JP1990/001421 patent/WO1991006773A1/ja active Application Filing

Patent Citations (3)

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