JP2864675B2 - Scroll compressor - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to lubrication of a scroll type compressor.

2. Description of the Related Art FIG. 3 shows a longitudinal sectional view of a conventional scroll compressor.

As shown in FIG.
The compression mechanism 2 is fixed below the inside of the motor, the stator 4 of the electric motor 3 driving the compression mechanism 2 is fixed above, and the rotor 5 of the electric motor 3 is connected with the crankshaft 6 driving the compression mechanism 2 and hermetically sealed. A lubricating oil reservoir 7 is formed around the compression mechanism 2 below the container 1.

The compression mechanism 2 pivots a fixed spiral blade part 10 having a fixed spiral blade 9 integrally formed with a fixed head plate 8 and a swirling spiral blade 11 which meshes with the fixed spiral blade 9 to form a plurality of compression working spaces 14. A swirling spiral blade part 13 formed on a head plate 12, a rotation restraining part 15 for preventing the swirling spiral blade part 13 from rotating and only rotating, and provided on the opposite side of the swirling spiral blade 11 of the rotating head plate 12. A turning drive shaft 16, an eccentric bearing 17 provided inside the main shaft 18 of the crankshaft 6, into which the turning drive shaft 16 fits, and a bearing component 21 having a main bearing 19 for supporting the main shaft 18 of the crankshaft 6. A head plate movement limiting surface for limiting the axial movement of the swirling blade part 13 with a small gap from the swivel head back surface 20 behind the swivel head plate 12.
Arrange 23.

An oil pump 24 is provided between the main shaft 18 of the crankshaft 6 and the back face 20 of the revolving end plate, and the lubricating oil in the lubricating oil reservoir 7 is sucked into the oil pump from the oil suction passage 25, and after a part of the lubricating the main bearing 19 The lubricating oil in the lubricating oil reservoir 7 and the balance weight portion 26 of the crankshaft 6 are discharged to a space 28 in an agitation preventing plate 27 which separates the lubricating oil. Through the lubricating oil discharge port 29, it is discharged to the space 28 in the stirring prevention plate 27.

The refrigerant gas sucked from the suction pipe 30 of the compressor passes through the accumulator 31, enters the compression mechanism 2 from the suction port 32 of the compression mechanism 2, is compressed in the compression working space 14, and is discharged from the discharge port 33.
Inside the discharge muffler 34, the discharge passage 3 provided in the fixed head 8
5. Discharged to the motor lower discharge chamber 37 between the electric motor 3 and the compression mechanism 2 through the discharge passage 36 provided in the bearing part 21. The discharged refrigerant gas passes through a discharge chamber 39 above the motor from the motor peripheral passage 38 to cool the motor 3, and then is guided from the discharge pipe 41 through the discharge chamber 40 to the compressor.

Problems to be Solved by the Invention In a scroll compressor of a type in which a compressor is disposed at a lower portion and an agitation preventing plate for preventing lubricating oil from being agitated by a crankshaft is installed, lubricating oil is supplied to a sliding portion in an operating state. However, there is a possibility that the oil pump function stops at the time of stoppage and the oil in the sliding portion runs out.

Further, in order to solve the problem that the start-up failure occurs due to the liquid compression at the start due to the lubricating oil entering the compression working space during the stop, the reverse operation is performed once at the start, and after the lubricating oil in the compression working space is discharged. In case of normal rotation, the oil pump does not operate at the time of reverse rotation, there is no lubricating oil in the space inside the stirring prevention plate, and the sliding parts of the crankshaft, main bearing and eccentric bearing may cause poor lubrication. .

Means for Solving the Problems In order to solve the problems of the conventional scroll compressor described above, the present invention provides a notch formed by communicating a lubricating oil reservoir and a balance weight portion with each other to an agitation preventing plate. Is provided.

Operation The present invention, with the above-described configuration, prevents oil agitation in a state where a sufficient amount of oil has accumulated in the lubricating oil reservoir during operation,
When the compressor is stopped, the lubricating oil flows from the lubricating oil reservoir through the notch provided in the agitation preventing plate into the agitation preventing plate, and the lubricating oil is supplied to the sliding portion even during the reverse operation when the compressor is started.

Embodiment An embodiment of the present invention will be described below with reference to FIG.

As shown in the figure, in the scroll compressor of the present embodiment, a compression mechanism 2 is fixed below the inside of a closed container 1, a stator 4 of a motor 3 for driving the compressor is fixed above, and a rotor of the motor 3 is fixed. 5 is connected to a crankshaft 6 for driving the compression mechanism 2, and a lubricating oil reservoir 7 is provided around the compression mechanism 2 below the closed casing 1.
To

The compression mechanism 2 pivots a fixed spiral blade part 10 having a fixed spiral blade 9 integrally formed with a fixed head plate 8 and a swirling spiral blade 11 which meshes with the fixed spiral blade 9 to form a plurality of compression working spaces 14. A swirling spiral blade part 13 formed on a head plate 12, a rotation restraining part 15 for preventing the swirling spiral blade part 13 from rotating and only rotating, and provided on the opposite side of the swirling spiral blade 11 of the rotating head plate 12. A turning drive shaft 16, an eccentric bearing 17 provided inside the main shaft 18 of the crankshaft 6, into which the turning drive shaft 16 fits, and a bearing component 21 having a main bearing 19 for supporting the main shaft 18 of the crankshaft 6. A head plate movement limiting surface for limiting the axial movement of the swirling blade part 13 with a small gap from the swivel head back surface 20 behind the swivel head plate 12.
Arrange 23.

An oil pump 24 is provided between the main shaft 18 of the crankshaft 6 and the back surface 20 of the revolving end plate, and the lubricating oil in the lubricating oil reservoir 7 is sucked into the oil pump 24 from the oil suction passage 25 and partially lubricates the main bearing 19. Thereafter, the lubricating oil is discharged to a space 28 in an agitation preventing plate 27 that separates the lubricating oil in the lubricating oil reservoir 7 and the balance weight portion 26 of the crankshaft 6. Through the lubricating oil discharge port 29 to the space 28 in the stirring prevention plate 27. The stirring prevention plate 27 has a notch 42 as shown in FIG.

The refrigerant gas sucked from the suction pipe 30 of the compressor passes through the accumulator 31, enters the compression mechanism 2 from the suction port 32 of the compression mechanism 2, is compressed in the compression working space 14, and is discharged from the discharge port 33 to the discharge muffler 34. The gas is discharged into a motor lower discharge chamber 37 between the motor 3 and the compression mechanism 2 through a discharge passage 35 provided inside the fixed end plate 8 and a discharge passage 36 provided in the bearing component 21. The discharged refrigerant gas passes through a discharge chamber 39 above the motor from the motor peripheral passage 38 to cool the motor 3, and then is guided from the discharge pipe 41 through the discharge chamber 40 to the compressor.

Effect of the Invention The scroll compressor of the present invention, when stopped, the lubricating oil in the lubricating oil reservoir flows into the space inside the agitation prevention plate from the notch provided in the agitation prevention plate, and there is a reverse rotation operation at the time of starting, Even when the oil pump does not operate, the sliding portions of the crankshaft, the main shaft, and the eccentric bearing are filled with the lubricating oil, and sufficient lubrication can be performed. In addition, when the normal rotation operation is stable, the refrigerant mixes with the lubricating oil and the liquid level rises, but the area of the stirring prevention plate portion above the hole or the notch is sufficiently larger than the hole or the notch area. By preventing the lubricating oil from flowing into the space inside the agitation preventing plate and hindering the agitation of the lubricating oil by the balance weight, there is no effect on the performance, and a highly reliable compressor is obtained.

Further, by setting the notch position above the lubricating oil level, oil discharge can be prevented.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of one embodiment of a scroll compressor according to the present invention, FIG. 2 is a perspective view of a main part showing an embodiment of the scroll compressor of the present invention, and FIG. It is a longitudinal cross-sectional view. 1 ... closed container, 2 ... compression mechanism, 3 ... motor, 24 ...
... Pump, 27 ... Stirring prevention plate, 42 ... Notch.

Claims (2)

(57) [Claims] An electric motor is disposed in an upper part of an inside of a closed container, a compression mechanism driven by the electric motor is disposed in a lower part, a lubricating oil reservoir is disposed in an upper part of the compression mechanism, and the compression mechanism is provided with fixed blades. A fixed spiral blade component having a fixed spiral blade fixed or formed integrally with a frame, and a swirl spiral blade fixed or formed on a swivel head plate, the swirl spiral blade meshing with the fixed spiral blade to form a plurality of compression spaces. Components, a rotation restraining component for restraining rotation of the swirling spiral blade component, a crankshaft for driving the swirling spiral blade component eccentrically rotating, and a bearing component for supporting a main shaft of the crankshaft, A stirring prevention plate mounted on the compression mechanism and partitioning the lubricating oil in the lubricating oil reservoir and the balance weight portion of the crankshaft; and at least one hole or notch is provided in the stirring prevention plate. Roll compressor. 2. The scroll compressor according to claim 1, wherein the hole or notch of the agitation preventing plate is located above a lubricating oil level.