JPH01253586A - Compressor - Google Patents

Abstract

PURPOSE:To prevent the seizure of a bearing by providing a machine section (compression section) driven by a motor provided at the upper section in an enclosed casing and providing a recess on the upper face of the bearing at the upper end section of a shaft connecting the machine section and the motor. CONSTITUTION:When a piston 6 is eccentrically rotated via a shaft 8 by the drive of a motor 2 stored at the upper section of an enclosed casing 1, the refrigerant gas sucked into a compression chamber 12 from an intake pipe 16 via an intake hole is compressed in a compression chamber 12 and discharged via a discharge hole 14, a space section in the enclosed casing 14, and a discharge pipe 17. In this case, a recess 20 is formed on the upper face of a bearing 19 supporting the upper end section of the shaft 8. When the refrigerant containing oil which is discharged through the discharge hole 14 flows above the bearing 19 and hits the enclosed casing 1 or an oil separator 21, oil is separated from the refrigerant, the separated oil is accumulated in the recess 20, and the oil in the recess 20 is fed to the shaft 8 to prevent the seizure of the bearing 19.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to oil supply for compressors used in refrigeration cycles and the like.

BACKGROUND OF THE INVENTION A conventional rotary compressor will be described by way of example with reference to the drawings.

FIG. 2 shows a cross section of a conventional rotary compressor. In Figure 2, 1 is the sealed casing, 2 is the motor, 3 is the lower bearing, 4 is the upper bearing, 6 is the cylinder, 6 is the piston, 7 is the vane, 8 is the shaft, and 9 is the shaft upper end bearing at the upper end of the shaft. be. Also, 10 is the shaft 8
11 is an oil supply hole provided in the shaft 8, 12 is a compression chamber formed between the cylinder 5' and the piston 6, 13 is an eccentric portion of the
14 is a suction hole that sucks refrigerant into the compression chamber 12, and 14 is an upper bearing 4.
15 is a discharge valve. 16 is suction hole 1
The suction pipe communicating with 3 is a discharge pipe provided in the sealed casing 1. 18 is a lower bearing of 3 degrees and an upper bearing of 4 degrees. cylinder 6
, and a piston 6. The motor 2 is located on the top of the mechanical part 17, and the shaft upper end bearing 9 is located on the top of the motor 2.

The operation of the rotary compressor configured as above will be explained below.

Motor 2. As the shaft 8 rotates, refrigerant gas is sucked from the suction pipe 1θ through the suction hole 13, is compressed in the compression chamber 12, is discharged from the suction hole 14 into the sealed casing 1, and then is sent from the discharge pipe 17 to the refrigeration cycle. /L/ (not shown).

Problem to be Solved by the Invention However, in the above configuration, when the refrigerant discharged from the discharge pipe 17 passes through the shaft upper end bearing 9 and is discharged from the discharge hole 14, the shaft upper end bearing 9 is damaged by the oil contained in the refrigerant. Since only the shaft is lubricated, the upper end bearing of the shaft seizes up.

The present invention solves the above problems and provides a compressor in which the upper end bearing of the shaft does not seize.

Means for Solving the Problems In order to solve the above problems, the compressor of the present invention includes a mechanical part in a sealed casing and a motor above the mechanical part, and connects the mechanical part and the motor with a shaft,
A shaft upper end bearing that supports the shaft upper end is provided, and a recess is provided on the upper surface of the shaft upper end bearing.

According to the present invention, the refrigerant containing oil discharged from the discharge hole flows above the bearing at the upper end of the shaft, and the oil separated from the refrigerant by hitting the sealed casing accumulates in the recess on the upper surface of the bearing at the upper end of the shaft. Since the upper end of the shaft is lubricated, seizing of the bearing at the upper end of the shaft can be prevented.

Example Below, regarding a rotary compressor according to an example of the present invention,
The description will be made with reference to the drawings, but the same components as those of the prior art will be given the same reference numerals and detailed description thereof will be omitted.

FIG. 1 is a sectional view of a rotary compressor in an embodiment of the present invention.

In FIG. 1, reference numeral 19 denotes a shaft upper end bearing, and a recessed portion 2° is provided on the upper surface of the shaft upper end bearing 19. Additionally, an oil separator 2 is provided above the bearing 19 at the upper end of the shaft.
1 is provided, but this is not necessary.

According to this embodiment, the refrigerant containing oil discharged from the discharge hole 14 flows above the shaft upper end bearing 19, and the oil that is separated from the refrigerant by hitting the sealed casing 1 or the oil separator 21 is released into the shaft. It collects in the recess 2o on the upper surface of the upper end bearing 19, lubricates the shaft, and prevents the upper shaft bearing 19 from seizing.

Note that the rotary compressor described above is just an example, and compressors of other compression methods may be used.

Effects of the Invention As described above, the present invention includes a mechanical part in a sealed casing and a motor above the mechanical part, and a shaft that connects the mechanical part and the motor and supports the upper end of the shaft. By providing an upper end bearing and providing a recess on the upper surface of the shaft upper end bearing, oil separated from the refrigerant collects and slides on the shaft upper end bearing, thereby preventing seizure of the shaft upper end bearing.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a rotary compressor according to an embodiment of the present invention, and FIG. 2 is a sectional view of a conventional compressor. 1... Sealed casing, 2... Motor, 8... Shaft, 18... Mechanical part,
19... Shaft upper end bearing, 20...
・Concavity, 21...Oil separator. Name of agent: Patent attorney Toshio Nakao and 1 other person1-
Beg PA Kusink 2- Motor δ-n Maft I8- Mechanical part/'? --Shaft Ezukiya Bearing □1 Figure 2°0-0a

Claims (1)

[Claims] A mechanical part is provided in a sealed casing, and a motor is provided above the mechanical part. The mechanical part and the motor are connected by a shaft, and a shaft upper end bearing is provided to support the upper end part of the shaft. A compressor with a recess on the top surface of the upper end bearing.