JPH0333493A - Enclosed rotary compressor - Google Patents

Abstract

PURPOSE:To ensure oil supply by furnishing a throttle plate so as to be situated in the lower bearing in the neighborhood of the bottom of an oil supply hole bored in a crank shaft, installing an oil supply pipe at this throttle plate, and thereby preventing drop of the oil level due to rotation. CONSTITUTION:A cylindrical throttle plate 17 with the lower part opened is fitted in the bottom opening of a lower bearing 6 of a crank shaft 4, and an oil supply pipe 15 is penetrated in the top center of this throttle plate 17. The bottom of this oil supply pipe 15 extends to a point very near the bottom surface of an enclosed vessel 1 and is left opened. A minute gap is retained between the bottom of the crank shaft 4 and the top of the throttle plate 17. In the lower part of this vessel 1, lubricant 14 is stored. When the crank shaft 4 rotates, the pressure distribution in the surrounding area assumes a parabolic curve with its rotational center the lowest to generate a differential pressure in the oil supply pipe 15 and in the vessel 1, and thereby the lubricant 14 is led to the oil supply hole 4b in the shaft 4. At this time, the oil supply pipe 15 remains out of rotation, so that no drop of the oil level occurs, and the lubricant is held in the gap to allow utilization for lubrication.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an improved hermetic rotary compressor, that is, an a-tary compressor, and particularly to a hermetic rotary compressor with improved bearing strength. It concerns the structure of the machine.

[Prior Art] A closed rotary compressor in which a crankshaft is driven by an electric motor and gas is compressed by rotation of a rolling piston has been conventionally used, for example, in Japanese Patent Application Laid-open No. 173388-1988.
The one described in the publication No. 1 is known. FIG. 6 is a sectional view showing the structure of the closed R1 rotary compressor disclosed in the above publication.

As shown in the figure, this compressor includes an electric motor section consisting of a stator 2 and a rotor 3, and a compressor section consisting of a cylinder 7, a rolling piston 9, etc., housed inside a closed container 1. A rotor 3 of the electric motor portion is connected to the upper part of a crankshaft 4, and the crankshaft 4 is rotatably supported by an upper N bearing 5 and a lower bearing 6.

There is an eccentricity aB4a between the upper and lower bearings 5°6 of the crankshaft 4, and this eccentricity iiB4a has the following:
Rolling piston 9 rotating eccentrically within cylinder 7
is directly pronounced.

The cylinder 7 is provided with a blade (not shown) which is always kept in contact with the rolling piston 9 by a spring (not shown). The gas sucked into the cylinder 7 from the suction pipe 13 is compressed as the volume of the space surrounded by the blade, the rolling piston 9 and the cylinder 7 decreases as the rolling piston 9 rotates, and the gas is compressed through the discharge port and the discharge port. After being discharged into the discharge muffler II through a valve (both not shown), it is discharged into the closed container 1 through a small hole made in the discharge muffler 11. The gas discharged into the closed container 1 is discharged from the discharge pipe 12 to the outside of the closed container 1 through a gap between the stator 2 and the stator 3.

The bottom of the closed container 1 serves as a lubricating oil reservoir in which a lubricating oil reservoir 4 is stored. An oil supply pipe 15 is attached to the oil absorption hole at the bottom of the crankshaft 4, and as the crankshaft 4 rotates, the airtight container! The lubricating oil I4 at the bottom is sucked up into the oil absorption hole 4b through the oil supply pipe 15, and is supplied to each bearing portion.

[Problems to be Solved by the Invention] The conventional hermetic rotary compressor is constructed as described above, and the oil supply pipe is attached to the crankshaft. For this reason, foaming that occurs during startup, or refrigerant (
If the lubricating oil is taken out of the compressor and the curved surface is lowered due to overfilling (gas), etc., it may not be possible to supply sufficient oil to the bearings. Furthermore, since the oil supply pipe itself is fixed to the crankshaft and rotates, the lubricating oil is agitated by the influence of its rotation, causing the oil level to drop, resulting in insufficient oil supply and bearing seizure.

This invention aims to solve the above-mentioned problems with conventional hermetic rotary compressors, and aims to provide a more reliable hermetic rotary compressor with improved bearing strength. purpose.

[Means for Solving the Problems] In order to achieve the above object, the hermetic rotary compressor of the present invention has an electric motor that drives a crankshaft supported by an upper bearing and a lower bearing mounted in an upper part of a hermetic container. A compression element that divides the compression chamber into a low-pressure side and a high-pressure side by the rotation of a rolling piston that moves along the inner circumferential surface of the cylinder due to the eccentric portion of the crankshaft is stored and arranged in the lower part of the closed container, and the crankshaft In a hermetic rotary compressor that sucks lubricating oil from a lubricating oil reservoir through an oil suction hole provided at the lower end and supplies the oil to each sliding part, the oil supply hole of the crankshaft is located in the lower bearing near the lower end of the compressor. It is equipped with a diaphragm plate as shown in the figure, and an oil supply pipe is attached to this diaphragm plate.

[Function] In this invention, the lower bearing that supports the crankshaft is equipped with a throttle plate, the oil supply pipe is attached to this throttle plate, and the lubricating oil is sucked up by the oil supply pipe that does not rotate together with the crankshaft. Lubricating is performed without the curved surface deteriorating due to the influence of rotation. Furthermore, by keeping the gap between the throttle plate and the lower end surface of the crankshaft small, lubricating oil is retained in the gap even in an oil-depleted state.

[Example] Hereinafter, the configuration of the present invention will be described in detail based on an example shown in the drawings. In the figure, the same or corresponding parts as in FIG. 6 explaining the conventional example are given the same reference numerals.

FIG. 1 shows the structure of a first embodiment of a hermetic rotary compressor of the present invention. In the figure, the overall structure of the compressor and the action of gas compression are the same as those of the conventional example described above, so repeated explanation will be omitted.

In this embodiment, a throttle plate 17 is formed within the lower end opening of the lower bearing 6 of the crankshaft 4. This aperture plate 17 is formed in a cylindrical shape with an open bottom, and is arranged so that its lower end is close to the bottom surface of the closed container. The oil supply pipe I is connected to the center of the upper end of this aperture plate 17.
5 is penetrated and fitted, and the lower end of this oil supply pipe 15 extends to very close to the bottom surface of the closed container I and is open. A small gap is maintained between the lower end of the crankshaft 4 and the upper end of the aperture plate 17.

The lubricating oil I4 stored in the lower part of the closed container 1 is sucked up from the oil supply pipe 15 as the Taranokun Yaft 1 rotates, and is supplied to each bearing portion. The effect at this time is explained in the second
This will be explained using figures. When the crankshaft 4 (when rotated), the pressure distribution line around it becomes a parabola with the center of rotation being the lowest, as shown by A-A in the figure. A pressure difference is created between
Lubricating to the oil absorption hole 4b in the crankshaft 4 #tII14
is guided. When the inner diameter of the oil absorption hole 4b is D1 and the inner diameter of the oil supply pipe 5 is d, by narrowing the diameter to about d/D≦0.3, the lubricant M14 stored in the lower part of the sealed container 1 is reduced to the sealed volume R''b 1 It is possible to reduce the amount of liquid that is carried upward, and furthermore, it is possible to suppress the foaming phenomenon that occurs at the time of startup.

Since the oil supply pipe 15 extends to the vicinity of the bottom surface of the closed container l, it is possible to supply the lubricant even if the lubricating oil 14 is small. Also, the oil supply pipe 15 is a diaphragm plate! 7 together with the lower bearing 6
Since it is attached to the cylinder and does not have a rotating opening, the oil level will not drop due to the influence of rotation, making it possible to refuel reliably.

Furthermore, crankshaft 4 and aperture plate! Since the gap between the lubricating oil 14 and the lubricating oil 14 is very small, the viscosity of the lubricating oil 14 allows a small amount of the lubricating oil to be retained and used for lubrication.

FIG. 3 shows the second embodiment of the hermetic rotary compressor of the present invention horizontally. The oil supply pipe I5 extends from the center of the upper end of the throttle plate 17 into the oil absorption hole 4b of the crankshaft 4. The operation in this case will be explained with reference to FIG. The lubricant Ih+4 supplied to the lower bearing 6 and the upper bearing 5 through the oil absorption hole 4b of the crankshaft 4 is discharged to the lower part of the closed container 1 through the oil drain groove I8. At this time, since the lubricating vibrator I5 extends into the oil absorption hole 4b of the crankshaft 4, the lubricating oil +4 is applied to the gap between the lower end surface of the crankshaft 4, the outer circumferential surface of the lubricating vibrator I5, and the upper end surface of the aperture 117. ! 9 and if the inside of sealed container 1 is depleted of oil, it is a sealed container!
The lubricating oil 14 is supplied to the upper oil absorption hole 4b by the gas flow from the lower part.
be lifted up towards. In this way, sufficient lubricating oil is always supplied to the bearing portion even in an oil-starved state.

FIG. 5 shows a third embodiment of the hermetic rotary compressor of the present invention. In this embodiment, the oil supply pipe 15 is
Its lower end extends to the vicinity of the bottom of the closed container 1, and at the same time its upper end extends to the oil absorption hole 4b of the crankshaft 4.
extends inside.

That is, this embodiment is a combination of the configurations of the first embodiment and the second embodiment, and has a combined effect of both.

In each of the above embodiments, the oil supply pipe 15 and the aperture plate 17 are made separately and attached to each other. In this case, there is an advantage that the number of parts can be reduced.

[Effects of the Invention] As is clear from the above explanation, the hermetic rotary compressor of the present invention is equipped with a throttle plate on the lower bearing, and the oil supply pipe is attached to this throttle plate, so that the oil supply pipe itself cannot rotate. First, it is possible to prevent a drop in the lubricating oil level due to rotation, and moreover, even when the lubricating oil is in a small amount, sufficient lubrication can be carried out.

As described above, according to the present invention, it is possible to provide a hermetic rotary compressor with high reliability due to the improved bearing strength.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing a first embodiment of the invention, Fig. 2 is an explanatory diagram of its operation, Fig. 3 is a sectional view showing a second embodiment of the invention, and Fig. 4 is an explanation of its operation. 5 is a sectional view showing a third embodiment of the present invention, and FIG. 6 is a sectional view showing a conventional hermetic rotary compressor. Oil hole, 5 is upper bearing, 6 is lower bearing, 14 is lubricating oil, 1
5 is an oil supply pipe, and 17 is a throttle plate. Note that the same reference numerals in each figure indicate the same or corresponding parts. Figure 2 Crane

Claims (1)

[Claims] The electric motor that drives the crankshaft supported by the upper and lower bearings is mounted on the upper part of the sealed container, and the rotation of the rolling piston that rolls along the inner circumferential surface of the cylinder by the eccentric part of the crankshaft causes the compression chamber to be moved to the low pressure side. A closed type in which a compression element divided into a high-pressure side and a high-pressure side is housed in the lower part of the sealed container, and the lubricating oil from the lubricating oil reservoir is sucked in from the oil absorption hole provided at the lower end of the crankshaft to supply oil to each sliding part. A rotary compressor, characterized in that a throttle plate is provided in the lower bearing so as to be located near the lower end of the oil supply hole of the crankshaft, and an oil supply pipe is attached to the throttle plate. Machine.