JPH02163489A - Rotary compressor - Google Patents

Abstract

PURPOSE:To keep off any seizure or binding of a bearing by supporting an upper end of a shaft connecting a machine part to a motor installed on top of it with this bearing being situated on top of the motor, and installing an oil duct interconnecting a vane back space at the vane outer diametral side to this bearing. CONSTITUTION:A machine part 18 and a motor 2 installed on top of it are connected to each other through a shaft 8. Bearing 3, 4 supporting a cylinder 5 and a piston 6 in this machine part 18 up and down are lubricated by lubricating oil 20 via an oiling port 11. In comparison with this, an upper end of the shaft 8 is supported by a shaft upper and bearing 9 at an upper position of the motor 2. Accordingly, this bearing 9 is interconnected to a vane back space 21 at the vane outer diametral side by an oil duct 22. Therefore, the lubricating oil 20 collected in the lower part of a closed casing 1 is fed to the shaft upper bearing 9 by way of the oil duct 22 by vane pumping action being produced by reciprocating motion of a vane 7 at the vane back space 21, thereby lubricating the bearing 9, thus seizure or binding is preventable.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a rotary compressor 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 a sealed casing, 2 is a motor, 3 is a lower bearing, 4 is an upper bearing, 5 is a cylinder, e is a piston, 7 is a vane, 8 is a shaft, and 9 is a shaft upper end bearing at the upper end of the shaft. It is. Further, 10 is an eccentric portion of the shaft 8, 11 is an oil supply hole provided in the shaft 8, 12 is a compression chamber formed between the cylinder 6 and the piston 6, and 13
14 is a suction hole that sucks refrigerant into the compression chamber 12, and 14 is an upper bearing 4.
16 is a discharge valve. 16 is suction hole 1
A suction pipe 17 communicates with 3, and a discharge pipe 17 is provided in the closed casing 1. 18 is the lower bearing 3. Upper bearing 4. Cylinder 5. It is a mechanical part composed of a piston 6, a motor 2 is located at the upper part of the mechanical part 1, and a shaft upper end bearing 9 is located at the upper part of the motor 2. Also,
A refrigerant passage 19 is provided in the shaft upper end bearing 9, and lubricating oil 20 is stored in the lower part of the sealed casing 1.

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

As the motor 21 shaft rotates 80 times, refrigerant gas is sucked in from the suction pipe 16 through the suction hole 13 and is compressed in the compression chamber 12 and discharged from the discharge hole 14 into the sealed casing 1 and then passes through the refrigerant passage 19. The liquid is discharged from the discharge pipe 17 to a refrigeration cycle (not shown).

Problem to be Solved by the Invention However, in the above configuration, the lower bearing 3. The sliding parts between the upper bearing 4 and the shaft 8 are lubricated by oil supplied from the oil supply hole 11, but the sliding parts between the shaft upper end bearing 9 and the shaft 8 are lubricated by the oil that has finished lubricating the upper bearing 4 and the discharged oil. The oil discharged from the hole 14 flows upward in the form of a mist, and only a small amount of oil separated from the refrigerant on the inner wall of the sealed casing 1 is used for lubrication. It had the problem of being burned out.

In view of the above-mentioned problems, the present invention provides a compressor in which the bearing at the upper end of the shaft in the upper part of the motor does not seize.

Means for Solving the Problems In order to solve the above problems, the compressor of the present invention includes a lower bearing, an upper bearing, and a cylinder in a sealed casing.

A mechanical part consisting of a binuton, a vane, and a shaft, a motor on the upper part of the mechanical part, and a l1
The motors described in iJ are connected by a shaft, a shaft upper end bearing is provided to support the shaft upper end, and an oil guide pipe is provided to communicate the vane rear space on the outer diameter side of the vane with the shaft upper end bearing. .

According to the above-described configuration, the present invention allows the oil accumulated in the lower part of the sealed casing to be sent to the bearing at the upper end of the shaft through the oil guide pipe by the vane pump action generated by the reciprocating movement of the vane in the space behind the vane on the outer diameter side of the vane. This prevents seizure by lubricating the sliding parts with the shaft.

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 21 denotes a vane back space on the outer diameter side of the vane 7, and the vane back space 21 and the sliding portion of the shaft upper end bearing 9 are communicated through an oil guide pipe 22. Reference numeral 23 denotes an oil blow-up pipe, which communicates the lower part of the sealed casing 1 with the vane back space 21, but this is not particularly necessary.

According to this embodiment, due to the vane pump action generated by the reciprocating motion of the vane 7 in the vane back space 21 on the outer diameter side of the casing 7, the oil accumulated at the lower part of the sealed casing 1 passes through the oil guide pipe 22 and reaches the upper end of the shaft. Oil is sent to the bearing 9 to lubricate the sliding part with the shaft 8, thereby preventing seizure.

Effects of the Invention As described above, the present invention includes a mechanical part including a lower bearing, an upper bearing, a cylinder, a piston, a vane, and a shaft in a sealed casing, and a motor on the upper part of the mechanical part.
The mechanical part and the motor are connected by a shaft, the shaft upper end bearing is provided to support the upper end of the shaft, and an oil guide pipe is provided to communicate the vane rear space on the outer diameter side of the vane and the shaft upper end bearing. Due to the vane pump action generated by the reciprocating movement of the vane in the space behind the vane on the outer diameter side of the vane, the oil accumulated at the bottom of the sealed casing is sent to the bearing at the upper end of the shaft via the oil guide pipe, and the sliding part with the shaft is It can prevent seizure by lubricating the

[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...4 motor, 3
...Lower bearing, 4...Upper bearing, 6...
...Cylinder, 6...Song, Piston% 7...
・Vane, 8・Old...Shaft, 9...Shaft upper end bearing, 18...Mechanical part, 21...
・Vane back space, 22...Oil guide pipe, 23...
...Oil blow-up pipe. Name of agent: Patent attorney Shigetaka Awano and 1 other person! Figure diagram

Claims (1)

[Claims] It consists of a mechanical part consisting of a lower bearing, an upper bearing, a cylinder, a piston, a vane, and a shaft in a sealed casing, and a motor provided on the upper part of the mechanical part, and the mechanical part and the motor are connected by a shaft, and the shaft A rotary compressor comprising: a shaft upper end bearing that supports the upper end of the rotary compressor; and an oil guide pipe that communicates the vane back space on the outer diameter side of the vane with the shaft upper end bearing.