JPH02264182A - Oil feeder for scroll fluid machine - Google Patents

Abstract

PURPOSE:To prevent the abrasion and baking of a slide bearing by providing a spiral groove on the inner peripheral face of the slide bearing or on the outer peripheral face of a drive shaft crank part and feeding oil under discharged pressure to the spiral groove. CONSTITUTION:A man bearing 10 is a roller bearing. A thrust bearing 18 for supporting a drive shaft 9 is provided at the lower end of an inner ring 10b and a groove is provided on the surface of the bearing 18. the lower end face of a turning bearing 12 is subjected to the pressure of an intermediate pressure chamber 15 and the pressure on an upper end is in a state to be discharged through an oil feed passage 13. The inner peripheral face of the bearing 12 is provided with a spiral oil groove 12b with its one end opened to an intermediate pressure side and the other end including a smooth part 12a left from a discharge pressure side at a suitable interval. Thus, a part of lubricating oil passes through the oil feed passage 13 to lubricate a lower bearing 11 and flows in the intermediate pressure chamber 15, while the other part of oil passes through the oil groove 12b formed by leaving the smooth part 12a of the bearing 12 so as to lubricate the bearing 12 and then flows in the intermediate pressure chamber 15. At this time, the oil groove 12b is directed toward a retracting direction from the discharge pressure side to the intermediate pressure side with respect to the rotating direction of the drive shaft 9.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a lubricating device for a scroll fluid machine used in a compressor, an expander, a liquid pump, or the like.

[Conventional technology]

The principle of the If compression action of a scroll fluid machine, the force acting on the drive shaft in this type of scroll fluid machine, the lubricating method, the bearing structure, etc. are described in Japanese Patent Publication No. 19808/1983. Conventionally, the method of lubricating the bearing that supports the drive shaft crank of this type of scroll fluid machine is to provide a lubricant groove parallel to the axis on the outer circumferential surface of the drive shaft crank, and lubricate using the differential pressure between the discharge pressure and the intermediate pressure. are doing.

The oil supply groove is provided at a position away from the load acting door, and the oil supply amount is adjusted by the resistance of the oil supply groove.

[Problem to be solved by the invention]

In the above conventional technology, an oil supply groove parallel to +41]J is provided on the outer peripheral surface of the drive shaft, and due to the resistance of this oil groove, the pressure difference is large in the system in which oil is supplied using the differential pressure between the discharge pressure and the intermediate pressure. Therefore, the resistance changes depending on the depth of the groove, making it difficult to stabilize the amount of oil supplied.Furthermore, when a oil supply groove is provided on the drive shaft, the resistance needs to be large, so the groove is very small. However, it is difficult to collect oil in the groove, and at the same time, one side of the groove has a discharge pressure, and the end face has a
+5 pressure, and the pressure is reduced from the discharge pressure to the intermediate pressure in the groove, so the refrigerant contained in the oil boils in the g, causing an oil cut-off L, which can cause the shaft to turn completely, causing wear and seizure. there were.

SUMMARY OF THE INVENTION An object of the present invention is to prevent wear and seizure of a sliding bearing provided in an orbiting scroll, and to provide a reliable lubrication device based on a sketch.

[Failure to solve the problem]

In order to achieve the above objective, a method for lubricating the sliding bearing provided in the orbiting scroll is to provide a spiral groove on the inner circumferential surface of the sliding bearing or the outer circumferential surface of the drive shaft crank section, and to increase the discharge pressure. This is achieved by supplying oil to this spiral groove.

[Effect]

One end of the sliding bearing provided on the orbiting scroll communicates with the discharge chamber via the oil supply passage of one drive shaft, that is, the bearing has a discharge pressure. The other end is at intermediate pressure. The slide bearing is provided with a spiral groove with one end open to the intermediate pressure side and the other end leaving a smooth portion at an appropriate interval from the discharge pressure side of the slide bearing. Therefore, oil at the discharge pressure is supplied to one end of the slide bearing through the smooth portion, so that the oil flows into the spiral groove f'L, and the groove is filled with oil at an intermediate pressure, thereby performing oil supply.

In addition, if one end of the slide bearing is opened to the discharge pressure side, and the other end is provided with a spiral groove leaving a smooth section at an appropriate interval from the intermediate pressure side of the slide bearing, the oil at the discharge pressure is The oil flows into the spiral groove, the load is filled with oil at the discharge pressure, and oil is supplied via the smooth portion at the differential pressure between the discharge pressure and the intermediate pressure.

On the other hand, the same effect can be achieved even if a four-helical groove is provided on the outer circumferential surface of the crank portion of the drive shaft.

In this way, the sliding bearing portion of the orbiting scroll can be reliably lubricated via the spiral groove.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to υ. FIG. 1 shows a sectional view of the entire structure of a hermetic scroll compressor embodying the present invention.

In FIG. 1, a compressor section 2 is located above and an electric motor 8 is disposed below inside a closed container 1, and a small oil reservoir for lubrication is formed at the bottom of the closed container 1. The compressor section 2 is integrated with a fixed scroll 5 having a nine-wound wrap 5a on a plywood board, an orbiting scroll 6 having a spiral lug 6a on a base plate, and the fixed scroll 5, It has a frame 7 that supports an orbiting scroll 6, and has a structure in which the wraps of the fixed scroll 5 and the orbiting scroll 6 are engaged with each other.

Further, an Oldham mechanism 8 is provided between the orbiting scroll 6 and the frame 7 to prevent the orbiting scroll 6 from rotating. The machine 3 is press-fitted into the closed container 1 and is configured to rotate the orbiting scroll O via a drive shaft 9. The drive shaft 9 is supported by a main bearing 10 and a lower bearing 11 provided on the frame 7, and its crank pin is fitted into an orbiting bearing 12 provided on the back surface of the orbiting scroll 6.

An oil supply passage 18 is provided in the drive shaft 9 to guide lubricating oil to the main bearing 10, the F section bearing 11, and the slewing bearing 12.
A lubricating device 14 is provided at the shaft end of the #L motive 8 for sucking up lubricating oil from a reservoir and feeding it into the lubricating passage 18.

In the compressor section 2, when the orbiting scroll 6 is caused to orbit through a drive shaft 9 driven by an electric motor 8,
As the space (compression chamber) formed by the orbiting scroll 6 and the fixed scroll 5 moves toward the center of the scroll, its volume decreases to compress the sucked refrigerant gas. The compressed refrigerant gas is discharged from a discharge port 16 provided at the center of the plywood of the fixed scroll into an upper space 17 in the closed container.

Furthermore, an intermediate pressure chamber 15 is formed on the back surface of the orbiting scroll to which gas for the compression stroke is guided.

The pressure in the intermediate pressure chamber 15 is between the suction pressure and the discharge pressure of the refrigerant gas, and oil supply to the sliding portion of the scroll is performed using the differential pressure between the discharge pressure and the intermediate +nj chamber pressure.

FIG. 2 is an enlarged view for explaining the swing bearing 12 according to the present invention.

The main bearing 10 is a roller bearing consisting of an outer ring 10a, an inner ring IQb, a core alOC, etc., and a drive shaft 9 is provided at the lower end of the inner ring 10b.
A thrust bearing 18 is provided to support this. A groove is provided on the surface of the thrust bearing 18.

As described above, the lower end surface of the swing bearing 12 is at the pressure of the intermediate pressure chamber 15, and the pressure at the upper end is at the discharge pressure via the oil supply passage 18.

Further, a swing bearing 12 in which the present invention is implemented will be explained with reference to FIG. The inner circumferential surface of the swing bearing 12 is provided with a spiral oil groove 12b with one end (lower end) open to the intermediate pressure side and the other end (upper end) leaving a smooth portion 12a at an appropriate distance from the discharge pressure side. There is. Additionally, the rotation direction of the drive shaft 9 is shown in the figure.

FIG. 4 describes another embodiment of the swing bearing 19.

The inner peripheral surface of the swing bearing 19 is provided with a spiral oil groove 19b having one end (upper end) open to the discharge pressure side and the other end (lower end) having a smooth portion 19a at an appropriate interval from the intermediate pressure side. . Further, the rotation direction of the drive shaft 9 is shown in the figure.

5 and 6 show another embodiment in which a spiral oil groove is provided on the outer peripheral surface 9a of the crank portion of the drive shaft 9. FIG. 5 shows a spiral oil groove 20 that opens on the discharge pressure side. Moreover, FIG. 6 shows a spiral oil groove 21 that opens on the discharge pressure side. In both figures, the rotation direction of the drive shaft 90 is shown.

The lubricating oil is supplied from the oil supply device 14 through the oil supply passage 18 on one side;
After lubricating the lower bearing 11 to the intermediate pressure chamber 15 and lubricating the slewing bearing 12 through the oil groove 12b formed by leaving the smooth portions 12a at appropriate intervals of the slewing bearing 12 in FIG. It flows into chamber 15.

At this time, the oil groove 12b is drawn in from the discharge pressure side to the intermediate pressure side with respect to the rotational direction of the drive shaft 9.

Furthermore, in the other embodiments shown in FIGS. 4, 5, and 6, the lubricating oil flows into the intermediate pressure chamber 15 through the oil groove, as described above.

The lubricating oil that has flowed into the intermediate pressure chamber 15 flows into the compression chamber through the intermediate hole 6b, and is mixed with the refrigerant gas through the discharge port 16 provided at the center of the fixed scroll 5 to the upper wall gap 17 in the closed container l. Discharge to. As described above, the oil that has supplied the swing bearing 12 and the lower bearing 11 flows into the intermediate pressure chamber 15.

〔Effect of the invention〕

According to the present invention, it is possible to supply oil to the swing bearing by storing oil in the sliding part without providing an oil groove in the axial direction of the drive shaft crank part, which prevents oil from seizing even if there is a temporary lack of oil supply. There isn't. Furthermore, it is possible to make the groove depth larger than when an oil groove is provided in the axial direction on the crankshaft, increasing the capacity for storing oil, ensuring the amount of oil supply, and preventing seizure of the bearing. Further, according to this embodiment, it is possible to supply oil without providing an oil groove in the crankshaft, thereby improving efficiency during processing and manufacturing.

On the other hand, in the case of a spiral oil groove provided in the drive shaft crank part, the groove depth can be increased, increasing the capacity for storing oil in the sliding part, ensuring a sufficient amount of oil supply, and preventing bearing seizure. be able to.

[Brief explanation of drawings]

FIG. 41 is a longitudinal cross-sectional view showing the structure of a hermetic scroll compressor according to an embodiment of the present invention, and FIG. 2 is an enlarged cross-sectional view of the bearing portion of FIG. 1. Figure g8 is an enlarged view of the swing bearing part, Figure (a) is a perspective view, and Figure (a) is a perspective view.
b) The figure is a sectional view taken along line A-A. Figure g4 is an enlarged view of the slewing bearing part showing another embodiment, and (a
) is a perspective view, and Φ) is a BB sectional view. Fig. g5 and Fig. 6 are enlarged views of the drive shaft crank part showing still other embodiments, in which Fig. (a) is a perspective view and Fig. 6 (b)
) The figures are CC and D-DtI plane views. ■... Sealed container 2... Compressor section 5... Fixed scroll 6... Orbiting scroll 7...
Frame 9... Drive shaft 10... Main bearing
11...Town bearing 12...Swivel bearing 12a・
...Interval part 12b...Oil groove 15...Intermediate pressure chamber
19...Swivel bearing 20.21...Oil groove.

Claims (3)

[Claims] 1. The pressure in the space formed by the back surface of the orbiting scroll and the frame is set to a pressure higher than the suction pressure and lower than the discharge pressure (hereinafter referred to as intermediate pressure), and the orbiting scroll is pressed tightly against the fixed scroll, and the crank of the drive shaft is attached to the orbiting scroll. In a scroll fluid machine in which the pin portions are connected via a slide bearing and the shaft portion of the drive shaft is supported by a bearing provided in a frame, one end surface is opened to an intermediate pressure on the sliding surface of the slide bearing,
The other end is provided with a smooth portion at an appropriate interval to provide a discharge pressure. Alternatively, a spiral oil groove is provided with one end opening to the discharge pressure and the other end having an intermediate pressure with smooth parts interposed at appropriate intervals.
A lubrication device for a scroll fluid machine, characterized in that lubrication is performed using a differential pressure between the discharge pressure and an intermediate pressure. 2. On the outer circumferential surface of the crank pin portion of the drive shaft, one end is opened to an intermediate pressure, and the other end is set to a discharge pressure with a smooth portion interposed at an appropriate interval. Alternatively, a spiral oil groove is provided with one end open to the discharge pressure and the other end set to an intermediate pressure with smooth parts at appropriate intervals, and oil is supplied with the differential pressure between the discharge pressure and the intermediate pressure. Lubricating device for scroll fluid machinery. 3. An oil supply device for a scroll fluid machine according to claim 1 or 2, wherein the spiral oil groove is oriented in a direction from a discharge pressure side to an intermediate pressure side with respect to the rotation direction of the scroll fluid machine. .