JPH0326320Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Industrial application field]

This invention relates to a rotary compressor with an improved lubrication device.

[Conventional technology]

FIG. 5 is a vertical sectional view of the lower part of a conventional rotary compressor disclosed in, for example, Japanese Utility Model Application Publication No. 57-15379, and FIG. 6 is a longitudinal sectional view of the lower bearing. In (Fig. 5), 1 is a closed container, with an electric element (not shown) in the upper part and a compression element 2 in the lower part.
are respectively housed, and lubricating oil 3 is stored at the inner bottom. 4 is a crankshaft driven by an electric element; 4a is an eccentric portion of the crankshaft 4; 5 is a rolling piston that is rotatably fitted in the eccentric portion 4a and rotates eccentrically within the cylinder 6; 7 is a rolling piston of the cylinder 6; It is a lower bearing that closes the lower side, and the lower bearing 7
supports the lower end of the crankshaft 4. Reference numeral 8 denotes an upper bearing that is disposed opposite to the lower bearing 7, closes the upper side of the support 6, and forms a compression chamber inside together with the cylinder 6 and the lower bearing 7. The upper bearing 8 supports the upper part of the crankshaft 4. are doing. 9 is the bearing 7,
8, the oil drain groove is formed in a spiral shape as shown in FIG. It is designed to be discharged. Reference numeral 10 indicates a lubricating oil suction pipe that is fitted and fixed to the lower end of the crankshaft 4 and is immersed in the lubricating oil 3. Reference numeral 11 indicates a centrifugal pump consisting of a spiral blade provided within the crankshaft 4. formed in the centrifugal space of the shaft 4,
The lubricating oil 3 is sent upward by the suction action during rotation, and is delivered to each sliding part through the oil supply hole 17 provided in the crankshaft 4.
It is configured to be refueled through. Reference numeral 12 denotes an oil strainer attached to the lower end of the lower bearing 7, and this strainer 12 supplies various foreign substances mixed into the lubricating oil 3 and accumulated at the bottom of the closed container 1 to each sliding part along with the lubricating oil. This is to prevent this from happening. Reference numeral 13 denotes a suction pipe for sucking refrigerant gas into the compression chamber from outside the closed container 1. In the conventional rotary compressor configured as described above, the rotation of the crankshaft 4 by an electric element causes the rolling piston 5 to rotate within the cylinder 6 to compress gas, and the rotation of the crankshaft 4 compresses gas. 11 operates, the lubricating oil 3 at the inner bottom of the sealed container 1 is sucked into the lubricating oil suction pipe 10 through the oil strainer 12, supplied to each sliding part through the oil supply hole 17, and discharged to the outside of the bearing through the oil drain groove 9. are doing.

[Problem that the invention attempts to solve]

The conventional rotary compressor described above has a compression element 2
Because of the oil strainer 12, wear powder generated inside, especially inside the lower bearing 7, is not discharged to the outside of the lower bearing 7, but is sucked up from the lubricating oil suction pipe 10 and sent to each sliding part again. There was a problem that it caused seizure and wear of moving parts. This idea was made in order to solve the problems mentioned above, and it prevents the wear powder generated inside the lower bearing from being sent to the sliding part again, and prevents it from seizing on the sliding part. An object of the present invention is to provide a rotary compressor that can prevent wear from occurring.

[Means to solve the problem]

The rotary compressor according to this invention has an oil drain hole near the open end of an oil drain groove provided on the inner circumference of the bearing.

[Effect]

In the rotary compressor according to this invention, the wear particles generated in the bearing are discharged from the bearing through the oil drain hole provided in the bearing, and are not collected in the oil strainer provided at the lower end of the bearing. It is not sent to the sliding part again by the centrifugal pump.

【Example】

FIGS. 1 and 2 show an embodiment of this invention.
In these figures, the same reference numerals as in FIGS. 5 and 6 indicate the same or corresponding parts. In FIGS. 1 and 2, reference numeral 14 denotes an oil drain hole that communicates with the outer periphery of the lower bearing 7 from near the open end of the oil drain groove 9 of the lower bearing 7. The configuration of this embodiment other than the above is the same as that shown in FIGS. 5 and 6. In this embodiment, since the oil drain hole 14 is provided, the abrasion powder generated in the lower bearing 7 flows through the oil drain groove 9 to the open end of the oil drain groove 9, and further due to the rotation of the crankshaft 4. The oil is discharged from the lower bearing 7 through the oil drain hole 14 due to centrifugal force. FIG. 3 shows another embodiment of this invention. In FIG. 3, reference numeral 15 denotes a disk having an outer diameter larger than the outer diameter of the crankshaft 4, which is provided at the lower end of the crankshaft 4, and the abrasion powder flowing down from the oil drain groove 9 is removed from the disk 15.
At the same time, the oil is more easily discharged from the drain hole 14 to the lower bearing 7 due to the action of centrifugal force caused by four rotations of the crankshaft. FIG. 4 shows yet another embodiment of this invention.
In FIG. 4, 16 is a projection provided on the lubricating oil suction pipe 10, and the disc 15 is press-fitted to the lower end surface of the crank 4 and the lower end of the crankshaft 4. With the protrusion 16, the suction pipe 1
The disc 15 can be firmly fixed by being fitted and fixed when it is press-fitted into the crankshaft 4 of the disc 15. The configuration of the embodiment shown in FIGS. 3 and 4 other than that described above is the same as that shown in FIGS. 1 and 2, and in FIGS. The same reference numerals as in FIG. 2 indicate the same or corresponding parts.

[Effect of the idea]

As explained above, in the rotary compressor of this invention, foreign matter such as abrasion powder generated inside the bearing is removed from the bearing through the oil drain hole near the open end of the oil drain groove provided on the inner circumference of the bearing. Since it can be quickly discharged to the outside and foreign matter does not accumulate at the bottom of the oil straight, it has the effect of preventing bearing seizure and accelerated wear.

[Brief explanation of the drawing]

Fig. 1 is a vertical sectional view showing the lower part of a rotary compressor according to one embodiment of this invention, Fig. 2 is a longitudinal sectional view of the lower bearing, and Figs. 3 and 4 are different versions of this invention. FIG. 5 is a longitudinal sectional view showing the lower part of the rotary compressor according to the embodiment of the present invention, FIG. 5 is a longitudinal sectional view showing the lower part of the conventional rotary compressor, and FIG. 6 is a longitudinal sectional view of the lower bearing. 4... Crankshaft, 5... Piston, 6... Cylinder, 7, 8... Bearing, 9... Oil drain groove, 10... Lubricating oil suction pipe, 11... Centrifugal pump, 12... Oil strainer, 14... Oil drain hole, 15... Disc, 16...Protrusion, 1
7...Refueling hole. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A crankshaft that rotates a piston, a centrifugal pump installed at the bottom of the crankshaft, and a centrifugal pump installed on the crankshaft for lubricating each sliding part with this centrifugal pump. In a rotary compressor equipped with an oil supply hole, an oil strainer provided on the bearing on the suction side of the centrifugal pump, and an oil strainer provided on the tip of the bearing on the suction side of the centrifugal pump, an oil strainer provided on the inner circumference of the bearing. A rotary compressor characterized by having an oil drain hole that communicates with the outside of the bearing near the open end of the oil drain groove. (2) The rotary compressor according to claim 1, wherein the crankshaft has a disk having a larger outer diameter than the crankshaft at its lower end. (3) The rotary type compression according to claim 2 of the utility model registration claim, wherein the disc is clamped and fixed by the crankshaft and a lubricating oil suction pipe press-fitted to the lower end of the crankshaft. Machine.