JPH0458091A - Scroll compressor - Google Patents

Abstract

PURPOSE:To lubricate a crank shaft, a main shaft, and the sliding section of an eccentric shaft bearing even if an oil pump is out of service by mounting an agitation preventing plate onto a compression mechanism while partitioning lubricant within a lubricant bank from the balance weight section of a crank shaft, and thereby providing at least more than one cut-out for the agitation prevention plate. CONSTITUTION:An agitation preventing plate 27 partitioning a lubricant bank 7 from a balance weight section 26 is provided with a cut-out 42 communicating both of the plate and the bank with each other. This thereby prevents oil from being agitated in a state that the sufficient amount of oil pools in the lubricant bank 7 when a compressor is in operation. When a compressor is out of service, lubricant flow into the agitation preventing plate 27 out of the lubricant bank 7 through the cut-out 42 provided for the agitation preventing plate 27, lubricant is thereby fed to sliding sections even in the case of a reverse rotation at the time of starting the compressor.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to the lubrication of a scroll compressor.Prior art Fig. 3 shows a longitudinal sectional view of a conventional scroll compressor. In the conventional scroll compressor, the compression mechanism 2 is fixed at the lower part of the inside of the closed container 1, and the stator 4 of the electric motor 3 that drives it is fixed at the upper part.
A crankshaft 6 for driving the compression mechanism 2 is connected to the holder, and a lubricating oil reservoir 7 is formed around the compression mechanism 2 below the closed container 1.

The compression mechanism 2 includes a fixed spiral vane component 1o having a fixed spiral vane 9 integrally formed with a fixed end plate 8, and a rotating spiral vane 11 that meshes with the fixed spiral vane 9 to form a plurality of compression work spaces 14. A rotating spiral blade component 13 formed on the end plate 12, a rotation restraining component 15 that prevents the rotating spiral blade component 13 from rotating and only allows it to rotate, and a rotating spiral blade component 15 provided on the opposite side of the rotating spiral blade 11 of the rotating end plate 12. A bearing component 21 having a swing drive shaft 16, an eccentric bearing 17 provided inside the main shaft 18 of the crankshaft 6 and into which the swing drive shaft 16 is fitted, and a main bearing I9 that supports the main shaft 18 of the crankshaft 6. , this rotating spiral vane component 13 is placed at a minute gap from the rotating mirror plate rear surface 20 on the rear surface of the rotating mirror plate 12.
An oil pump 24 is installed between the main shaft I8 of the crankshaft 6 and the rear surface 20 of the rotating head plate.
A part of the oil is sucked into this pump from 5 and lubricates the main bearing 19, and then is sucked into the space 2 in the agitation prevention plate 27 that partitions the lubricating oil in the lubricating oil reservoir 7 and the balance weight part 26 of the crankshaft 6.
After lubricating the eccentric bearing 17, the refrigerant gas sucked in from the suction pipe 30 of the compressor (passes through the accumulator 31, and enters the compression mechanism 2 from the suction port 32 of the compression mechanism 2. , the inner edge of the discharge muffler 34, the discharge passage 35 provided in the fixed head plate 8, and the discharge passage 3 provided in the bearing component 21.
6 and is discharged into the motor lower discharge chamber 37 between the motor 3 and the compression mechanism 2. This discharged refrigerant gas passes from the motor peripheral passage 38 to the discharge chamber 39 above the motor, cools the motor 3, and is guided from the discharge pipe 41 to the outside of the compressor through the discharge chamber 40. The problem we are trying to solve is a scroll compressor of the type in which the compressor is located at the bottom and is equipped with an agitation prevention plate to prevent the lubricant from being agitated by the crankshaft. When the oil pump function stops, there is a possibility that the oil in the sliding parts will run out.In order to solve the problem that lubricating oil enters the compression work space during the stoppage and causes startup failure due to liquid compression at the time of start-up. - When performing forward rotation after first performing reverse rotation and draining the lubricating oil in the compression work space (see table), the oil pump does not operate during reverse rotation, there is no lubricant in the space inside the agitation prevention plate, and the crankshaft and The sliding parts of the main bearing and eccentric bearing may suffer from poor lubrication.

Means for Solving the Problems In order to solve the problems of the conventional scroll compressor described above, the present invention has been developed. This is to provide a notch.

Operation The present invention has the above-described configuration, so that during operation, a sufficient amount of oil remains in the lubricating oil reservoir to prevent oil agitation, and when the compressor is stopped, the lubricating oil is transferred from the lubricating oil reservoir to the agitation prevention plate. Flows from the notch into the agitation prevention plate. Lubricating oil is supplied to the sliding parts even during reverse operation when starting the compressor.

EXAMPLE Hereinafter, an example of the present invention will be described with reference to FIG.

As shown in the figure, in the scroll compressor of this embodiment, a compression mechanism 2 is fixed at the lower part of the inside of a closed container 1, and a stator 4 of an electric motor 3 that drives the compressor mechanism 2 is fixed at the upper part. A crankshaft 6 that drives the compression mechanism 2 is connected to a lubricating oil reservoir 7 around the compression mechanism 2 below the closed container 1. A spiral vane component 10, a spiral vane component 13 in which a spiral vane 11 that engages with the fixed spiral vane 9 to form a plurality of compression work spaces 14 is formed on a swirl mirror plate 12; A rotation restraining component 15 that prevents rotation and allows only rotation, a rotation drive shaft 16 provided on the opposite side of the rotation spiral blade 11 of this rotation end plate 12, and a rotation drive shaft 16 provided inside the main shaft 18 of the crankshaft 6 to prevent this rotation. A bearing part 21 having an eccentric bearing 17 into which the drive shaft 16 is fitted, and a main bearing 19 that supports the main shaft 18 of the crankshaft 6, and a bearing part 21 having a small gap from the back surface 20 of the swing head plate 12 on the back side of the swing head plate 12. This swirling spiral blade part 13
An end plate movement limiting surface 23 is arranged to limit movement in the axial direction.

An oil pump 24 is installed between the main shaft 18 of the crankshaft 6 and the rear surface 20 of the rotating head plate, and the lubricating oil in the lubricating oil reservoir 7 is supplied to the oil suction passage 2.
Part of the oil is sucked into this pump 24 from main bearing 1
After lubricating the lubricating oil 9, the lubricating oil in the lubricating oil reservoir 7 is discharged into the space 28 in the agitation prevention plate 27 that partitions the balance weight part 26 of the crankshaft 6, and then to other parts ζ.
The lubricated oil is discharged into the space 28 in the agitation prevention plate 27 through the lubricating oil outlet 29 of the crankshaft 6. The agitation prevention plate 27 has a notch 42 as shown in FIG. The gas enters, is compressed in the compression work space 14, and enters the discharge port 33. The inner plate of the discharge muffler 34. Electric motor lower discharge chamber 37
is discharged. This discharged refrigerant gas (from the motor peripheral passage 38 passes through the discharge chamber 39 above the motor to the motor 3
After being cooled, it is guided to the outside of the compressor through a discharge chamber 40 and a discharge pipe 41.

Effects of the Invention When the scroll compressor of the present invention is stopped, the lubricating oil in the lubricating oil reservoir flows into the space inside the agitation prevention plate through the notch provided in the agitation prevention plate and accumulates, causing reverse operation at the time of startup. If the oil pump does not operate, the sliding parts of the crankshaft and eccentric bearing will be filled with lubricating oil, providing sufficient lubrication.

In addition, when normal rotation is stable, the refrigerant mixes with the lubricating oil, and the liquid level rises.The area of the agitation prevention plate above the hole or notch is sufficiently larger than the area of the hole or notch, so it prevents agitation during operation. Since lubricant oil is prevented from flowing into the space inside the prevention plate and lubricant agitation by the balance weight is prevented, performance is not affected and the compressor becomes highly reliable.

Furthermore, by positioning the notch above the lubricating oil level, oil can be prevented from being discharged.

[Brief explanation of drawings]

FIG. 1 is a vertical cross-sectional view of an embodiment of a scroll compressor according to the present invention. FIG. 2 is a perspective view of essential parts showing an embodiment of a scroll compressor according to the present invention. FIG. In the top view, it shows: Airtight container 2... Compression mechanism 3... Electric a 24... Pump, 27... Stirring prevention plate, 42... Notch. Agent Name: Patent attorney Shigetaka Awano (1 person) Figure 2

Claims (2)

[Claims] (1) An electric motor is disposed in the upper part of the inside of the sealed container, a compression mechanism driven by the electric motor is disposed in the lower part, a lubricating oil reservoir is disposed in the upper part of the compression mechanism, and the compression mechanism is connected to the fixed blade frame. A fixed spiral vane component having a fixed spiral vane that is fixed or formed integrally with the body, and a swirling spiral vane component that has a swirling spiral vane that engages with the fixed spiral vane to form a plurality of compressed spaces fixed or formed on a rotating head plate. and a rotation restraint component that restrains the rotation of the swirling spiral vane component, a crankshaft that eccentrically rotates the swirling spiral vane component, and a bearing component that supports the main shaft of the crankshaft, and An agitation prevention plate is attached to the mechanism and partitions the lubricating oil in the lubricating oil reservoir and the balance weight portion of the crankshaft,
A scroll compressor, wherein the agitation prevention plate is provided with at least one notch. (2) The scroll compressor according to claim 1, wherein the notch of the agitation prevention plate is located above the lubricating oil level.