JPH01203692A - Rotary type compressor - Google Patents

Abstract

PURPOSE:To prevent seizure by providing a recessed part, which decreases its area toward the direction of rotation, in a plane part coming into contact with a bottom bearing in an eccentric part of a crankshaft and a communication hole, which penetrates through the eccentric part to a contact plane part with an upper bearing, in a minimum area part of the recessed part. CONSTITUTION:A recessed part 16, which decreases its area toward the direction of rotation of a rotary motion part, is provided in a plane part brought into contact with a bottom part bearing 11 in an eccentric part of a crankshaft 4. A communication hole 17, penetrating through this eccentric part, is provided in a minimum area part of the recessed part 16. In this way, lubricating oil, infiltrating into the recessed part 16, is increased in the pressure and forced to be fed to an upper part bearing 10 passing through the communication hole 17, and a trouble of seizure or the like can be eliminated because the lubricating oil lubricates the upper part bearing.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a rotary compressor in which a cylinder rotates to perform a compression action, and particularly relates to an improvement in its oil supply device.

2. Description of the Related Art Conventionally, this type of compressor is known, as shown in Japanese Patent Laid-Open Nos. 58-77193 and 62-7793, in which a cylinder rotates to perform a compression action.

That is, to explain the above conventional technology with reference to FIGS. 3 and 4, 1 is a sealed container, 2 is a stator a of an electric motor fixed in the sealed container 1, and this rotor 3 is a rotor of the electric motor.
It incorporates a compression element described below.

4 is a crankshaft having an eccentric portion with respect to the rotor axis;
It is fixed to a closed container 1. 5 is a cylinder, which has a cylindrical hole 5a concentric with the rotor 3 and a groove 5 in which the vane 6 can freely move forward and backward.
b. A cylinder chamber 7 is formed by the cylindrical hole 5a and the eccentric portion of the crankshaft 4, and the vane 6 is
It always slides in contact with the eccentric portion of the crankshaft 4, and moves reciprocatingly as the rotor 3 rotates to partition the cylinder chamber 7 into a low pressure chamber 7a and a high pressure chamber 7b. 8 is a vane spring that presses the vane 6 against the outer peripheral surface of the eccentric part of the crankshaft 4; 9 is a suction passage provided in the crankshaft 4; 10 is an upper bearing; 11 is a lower bearing; This bearing seals the upper and lower end surfaces of the rotor 3 and rotates the rotor 3 around the crankshaft 4. Further, the upper bearing 10 is provided with a discharge hole 12 through which the working gas flows out from the high pressure chamber 7b, and a discharge valve 13 that closes the discharge hole 12 until the pressure in the high pressure chamber 7b becomes equal to or higher than the pressure in the closed container 1. A discharge pipe 14 for discharging working gas is attached to the closed container 1, and lubricating oil 15 for lubricating the sliding parts is stored in the lower part of the discharge pipe 14.

Problems to be Solved by the Invention However, in this configuration, problems occur in lubrication, and there is a high possibility that seizure may occur in the sliding portion.

That is, the cylinder 5 rotates around the crankshaft 4 fixed to the sealed container 1 by means of an upper bearing 10 and a lower bearing 11 fixed to both end faces thereof, thereby exerting a compression action. The lubricating oil 15 is applied to the lower bearing 1.
1 rotates, it rises along the spiral groove provided on the cylindrical surface facing the lower bearing 11 of the crankshaft 4 and can lubricate this sliding surface, but the lubricating oil is sent to the sliding surface of the upper bearing 10. There was a problem with the image sticking, which caused burn-in.

The present invention has been made based on the above-mentioned circumstances, and provides a cylinder-rotating compressor in which lubricating oil can be pumped to the sliding surface of the upper bearing 10, thereby eliminating seizure in this area. It is.

Means for Solving the Problems The present invention includes a motor stator, a cylinder formed integrally with the motor rotor, and a cylinder fixed to both end surfaces of the cylinder, in a closed container in which lubricating oil is stored at the bottom. comprising an upper bearing, a lower bearing, and a crankshaft supported by both bearings, and a recess whose area decreases in the direction of rotation is provided on a flat surface of an eccentric portion of the crankshaft that contacts the lower bearing;
Furthermore, a communication hole is provided in the minimum area portion of the recessed portion to communicate with the flat surface portion that contacts the upper bearing.

Function: In the rotary compressor of the present invention configured as described above, the lubricating oil that rises between the cylindrical sliding surfaces of the crankshaft and the lower bearing due to the rotation of the lower bearing is provided at the eccentric portion of the crankshaft. Penetrates into the recesses.

The lubricating oil that has entered this recess moves in the direction of rotation due to its viscosity, but since the area of this recess gradually decreases in the direction of movement, the pressure increases. The lubricating oil is then forced to the upper bearing through the communication hole provided in the minimum area of the recess, and can lubricate the upper bearing.

Embodiment Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

An embodiment is shown in FIG. 1 and FIG. 2, and the same components as the conventional example are given the same reference numerals and the explanation thereof will be omitted, and only the structures different from the conventional example will be explained.

In FIG. 1, a recess 16 is provided in the flat part of the eccentric part of the crankshaft 4 that contacts the lower bearing 11. The area decreases in the direction of rotation, and its depth remains constant. Further, a communication hole 17 is provided in the smallest area portion of the recess 16 to allow the eccentric portion to communicate with the other.

FIG. 2 is a cross-sectional view taken along the line X in FIG. 1, and the arrow indicates the direction of rotation of the rotary motion part. With this configuration, when a rotational force is applied by the electric motor stator 2 to the cylinder 5 which is integrated with the rotor 3, the upper bearing 1 fixed to both end surfaces of the cylinder 5
The 0 and lower bearings 11 rotate together with the cylinder 5 around a crankshaft 4 fixed to the closed container 1. Then, the lubricating oil 15 stored at the bottom of the closed container 1 is transferred to the crankshaft 4.
The fluid flows upward through a spiral groove provided in the crankshaft 14 between the upper bearing 11 and the lower bearing 11, and flows into the recess 16.

The lubricating oil that has flowed into the recess 16 is caused by its viscosity.
6 in the direction of rotation. At this time, since the area of the recess 16 decreases in the direction of rotation, the pressure of the lubricating oil increases. The lubricating oil whose pressure has increased overcomes gravity through the communication hole 17 and flows toward the end face of the upper bearing. Thereafter, the lubricating oil flows between the upper bearing 10 and the crank 4 by the action of the helical groove provided in the crankshaft 4, and it becomes possible to lubricate both bearings, thereby eliminating problems such as seizure. In this embodiment, the depth of the recess 16 is kept constant and the area thereof is decreased, but the depth may be decreased in the direction of rotation, or both may be combined.

As described in detail, the rotary compressor of the present invention allows lubricating oil to flow sufficiently to the upper bearing, making it possible to provide a rotary compressor that eliminates problems such as seizure.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of a rotary compressor according to an embodiment of the present invention, FIG. 2 is a cross-sectional view taken along the line XX of FIG. 1, and FIG. 3 is a rotary compressor showing a conventional example. Longitudinal cross-sectional view, Figure 4 is y of Figure 3
-y line sectional view. DESCRIPTION OF SYMBOLS 1... Airtight container, 2... Motor stator, 4... Crankshaft, 6... Cylinder, 6... Vane, 10・・・・・・Upper bearing,
11... lower bearing, 15... lubricating oil,
16... recess, 17... communicating hole.

Claims (1)

[Claims] A motor stator, a cylinder integrally formed with the motor rotor, an upper bearing and a lower bearing fixed to both end surfaces of the cylinder, and a motor stator and a lower bearing fixed to both end surfaces of the cylinder are placed in a closed container in which lubricating oil is stored at the bottom. a crankshaft to be supported, a recess whose area decreases in the direction of rotation is provided in a contact plane part of the eccentric part of the crankshaft with the lower bearing, and a recess whose area decreases in the direction of rotation, and a minimum area part of the recess is provided with a recess that is connected to the upper bearing. A rotary compressor with a communication hole that communicates with the flat surface that comes in contact with the rotary compressor.