JP2006342674A - Scroll compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a highly reliable compressor for reducing oil exhaustion, in a scroll compressor for refrigeration and air-conditioning. <P>SOLUTION: This problem is solved by arranging a balance weight installed on a driving shaft for driving a compressor mechanism part and a partition plate for partitioning a delivery pipe positioned between the compressor mechanism part and an electric motor part, in the compressor having the compressor mechanism part, the electric motor part and an oil reservoir part in a sealed vessel. This invention can restrain the oil exhaustion, since turbulence of an air current of a lower space by the balance weight has no influence on the delivery pipe, by being divided into an intermediate lower space for positioning the balance weight under the partition plate and an intermediate upper space for positioning the delivery pipe positioned above the partition plate, in an intermediate space between a compression mechanism part and the electric motor part, by arranging the horizontal partition plate in a space between the balance weight and the delivery pipe. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a hermetic scroll fluid machine having a scroll compression mechanism.

  In a scroll fluid machine with a structure in which the drive shaft is supported by the main bearing portion and the sub-bearing portion at both ends of the motor portion, the turbulence of the airflow around the balance weight connected to the drive shaft is generated in the space between the compression mechanism portion and the motor portion. As a structure to which a cover for restraining is attached, a structure described in Japanese Patent Application Laid-Open No. 2004-293530 is known.

JP 2004-293530 A

  The structure described in Japanese Patent Application No. 2004-293530 has a balance weight cover that does not disturb the flow of refrigerant gas and oil by a balance weight connected to a drive shaft located between the main bearing and the motor unit. Around. With this structure, the disturbance of the air flow due to the balance weight is suppressed, and the oil rise is effective. However, in this structure, oil is discharged from the discharge pipe due to the turbulence of the airflow outside the balance weight cover. Further, since the balance weight and the balance weight cover are close to each other, a stirring loss is generated between the balance weight and the balance weight cover.

  In the present invention, by providing a horizontal partition plate in the space between the balance weight and the discharge pipe, the middle lower portion in which the balance weight below the partition plate is located in the middle space between the compression mechanism unit and the motor unit It can be divided into a space and a middle upper space where the discharge pipe located above the partition plate is located, and turbulence of the air flow in the lower space due to the balance weight does not affect the discharge pipe, thus suppressing oil rise Can do.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to provide the highly reliable scroll compressor which aimed at oil rise reduction.

  Embodiments of the scroll compressor according to the present invention will be described below.

  FIG. 1 is a cross-sectional view of a scroll compressor according to an embodiment of the present invention. In the hermetic container 7, a compression mechanism portion 120 is disposed above, an electric motor portion 6 is disposed in the center, and an oil sump 703 is disposed below. Therefore, the inside of the sealed container 7 by the compression mechanism unit 120 and the electric motor unit 6 includes an upper space 704 above the compression mechanism unit 120, a middle space 705 between the compression mechanism unit 120 and the electric motor unit 6, and the electric motor unit 6. It is divided into three spaces, a lower space 706 below.

  The compression mechanism 120 compresses the fixed scroll 1 with the spiral wrap 102 upright on the base plate 101 and the orbiting scroll 2 with the spiral wrap 202 upright on the base plate 201 by meshing the wraps 102 and 202 with each other. A mechanism is formed, and the fixed scroll 1 is provided with a suction port 103 and a discharge port 104. The fixed scroll 1 is fastened to the frame 4 with bolts.

  The electric motor unit 6 includes a stator 601 fixed to the hermetic container 7 and a rotor 602 fastened to the drive shaft 3.

  The drive shaft 3 includes a crank pin 301 at the tip, and the crank pin 301 is inserted into a boss protruding below the base plate 201 of the orbiting scroll 2. A slewing bearing 210 is provided in the boss and is configured to slide with the crankpin 301. The drive shaft 3 is supported by a main bearing 401 provided at the upper part of the electric motor and a sub bearing 8 provided at the lower part of the electric motor, and an oil supply pump 9 is attached to the lower end part. The oil supply pump 9 has a structure in which the oil in the oil sump 703 is sucked from the lower end of the pump and communicates with an oil passage 302 formed in the drive shaft 3.

  A main bearing 401 is fitted to the frame 4 that is in close contact with the inner wall of the sealed container, and the main bearing 401 is covered together with a thrust receiving member 403. The thrust receiving member 403 is attached to the frame 4 so as to be pressed from below the main bearing. The partition plate 405 according to the embodiment of the present invention is fastened to the frame 4 together with the thrust receiving member 403 with bolts 404 and is detachable. The partition plate 405 is horizontal and extends to near the inner wall of the sealed container. Under the main bearing at the lower part of the frame 4, an oil drain pipe 402 is fitted into the frame to return oil to the oil sump 703 after the oil passing through the oil passage 302 inside the drive shaft is supplied to the bearing by the oil pump 9. ing. Therefore, the partition plate 405 has a notch for allowing the oil drainage pipe 402 to pass through the outer periphery. FIG. 3 shows a partition plate according to an embodiment of the present invention.

  When the crankpin 301 of the drive shaft 3 rotates eccentrically by the rotation of the electric motor unit 6, the orbiting scroll 2 performs the orbiting motion without rotating with respect to the fixed scroll 1 by the rotation preventing mechanism of the Oldham joint 5 located on the back surface. In order to cancel out the unbalanced force generated by the turning motion, a balance weight 303 is provided between the main bearing 401 and the motor unit 6 on the drive shaft 3, and a rotor balance weight 304 is provided on the lower part of the rotor 602 fastened to the drive shaft 3. It is attached.

  The balance weight 303 is located below the partition plate 405.

  The sealed chamber formed by the wrapping of the fixed scroll 1 and the orbiting scroll 2 by the orbiting motion reduces the volume while moving to the center, compresses the gas, and discharges the compressed gas from the discharge port 104 to the discharge chamber. The gas discharged into the discharge chamber circulates around the compression mechanism portion 120 and the electric motor portion 6 and then is discharged from the discharge pipe 701 attached to the hermetic container to the outside of the compressor.

  The discharge pipe 701 is located between the compression mechanism part 120 and the electric motor part 6, and is located above the partition plate 405.

  The sub-bearing 8 is located on the opposite side of the electric motor unit 6 with respect to the compression mechanism unit 120 and has a structure in which the sub-bearing 8 is provided in the housing 801. The auxiliary bearing 8 is fixed to the hermetic container 7 via the lower frame 801.

  Next, the flow of gas and oil discharged from the compression mechanism 120 in FIG. 2 will be described.

  The refrigerant gas flows from the suction pipe 702 into the compression mechanism 120 through the suction port 103 of the fixed scroll 1. The refrigerant gas compressed by the compression mechanism 120 is discharged from the discharge port 104 to the upper space 704, and moves to the middle space 705 from the gap between the outer periphery of the frame 4 and the inner wall of the sealed container 7. A part of the refrigerant gas in the middle space 705 moves to the middle lower space 708 and the lower space 706 through the gap between the outer periphery of the partition plate 405 and the sealed container 7 and is used for cooling the motor unit 6. It is discharged out of the compressor through a discharge pipe 701 located at 707.

  The oil in the oil sump 703 is sucked up from the oil supply pump 9 by the rotation of the drive shaft 3, and supplied to the swivel bearing 210 through the oil passage 302. After passing through the slewing bearing 210, oil is supplied to the main bearing 410, and most of the oil is returned to the oil sump 703 through the oil drain pipe 402. A part of the oil passes through the gap between the inner diameter of the thrust receiving member 403 and the outer diameter of the drive shaft 3 and moves to the middle lower space 708 where the balance weight 303 under the partition plate 405 is located.

  Therefore, in the middle lower space 708 below the partition plate 405, the refrigerant gas and oil are agitated by the balance weight 303 to create a turbulent air flow. In the lower space 706 below the motor unit, oil is blown up from the oil sump 703 by the momentum of the refrigerant gas that has passed through the inner wall of the sealed container 7 and the stator outer peripheral passage 603. The refrigerant gas and oil blown up are agitated by the rotor balance weight 304 and the balance weight 303. Due to the above agitation, turbulence of the airflow is generated in various forms in the space below the partition plate 405.

  In this structure, by providing the partition plate 405 horizontally to the vicinity of the inner wall of the hermetic container 7, the turbulence of the air flow generated in the middle lower space 708 and the lower space 706 is blocked by the partition plate 405, and only the refrigerant gas having a low specific gravity is used. Passes between the outer periphery of the partition plate and the inner wall of the sealed container, shifts to the middle upper space 707, is discharged from the discharge pipe 701, and oil having a high specific gravity remains in the lower space 706. Therefore, in the middle upper space 707 where the discharge pipe 701 is located, the influence of the turbulence of the air flow caused by the refrigerant gas and the oil by the balance weight 303 and the rotor balance weight 304 in the middle lower space 708 and the lower space 706 is extremely reduced. It is possible to reduce oil that flows out together with the refrigerant gas, and so-called oil rise.

  As a result, it is possible to provide a highly reliable compressor by reducing oil rising.

1 is a sectional view of a scroll compressor according to a first embodiment of the present invention. It is a 1st Example of this invention, is a figure of a scroll compressor, and shows the flow of refrigerant gas and oil. FIG. 2 is a first embodiment of the present invention and shows a partition plate.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Fixed scroll, 101 ... Base plate, 102 ... Lap, 103 ... Inlet, 104 ... Discharge port, 120 ... Compression mechanism part, 2 ... Orbiting scroll, 201 ... Base plate, 202 ... Wrap, 210 ... Swivel bearing, 3 DESCRIPTION OF SYMBOLS ... Drive shaft, 301 ... Crank pin, 302 ... Oil passage, 303 ... Balance weight, 304 ... Rotor balance weight, 4 ... Frame, 401 ... Main bearing, 402 ... Oil drain pipe, 403 ... Thrust receiving member, 404 ... Bolt, 405: Partition plate, 5: Oldham joint, 6: Electric motor unit, 601: Stator, 602: Rotor, 603: Stator outer peripheral passage, 7: Sealed container, 701: Discharge pipe, 702 ... Suction pipe, 703 ... Oil sump, 704 ... Upper space, 705 ... Middle space, 706 ... Lower space, 707 ... Middle upper space, 708 ... Middle lower space, 8 ... Secondary bearing, 801 ... Howdin , 802 ... the lower frame, 9 ... oil supply pump.

Claims (1)

Inside the closed container, a compression mechanism part formed by combining a fixed scroll, a turning scroll and a frame, and an electric motor part consisting of a stator having a coil end and a rotor, and connecting the crank part of the drive shaft to the turning scroll, A drive shaft is supported by a main bearing portion and a sub-bearing portion provided at the lower end of the motor portion between the electric motor and the orbiting scroll, and a balance weight connected to the drive shaft is disposed below the main bearing, and above the balance weight. A scroll compressor comprising a discharge pipe for discharging a compressed gas fluid, wherein a partition plate is provided between the balance weight and the discharge pipe.

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