JPH04265488A - Rotary type enclosed compressor - Google Patents

Abstract

PURPOSE:To restrain a rotating shaft thrust receiving surface and a lower shaft receiving surface from sliding. CONSTITUTION:A groove 4 for holding lubricating oil is provided in the thrust receiving surface of a rotating shaft in a rotary type compressor and lubricating oil sucked through the hollow part 20 of the rotating shaft 13 is led in the groove 4 from an oil supply part 3 to form an oil film on a boundary surface between a thrust receiving surface and a thrust surface and restrain the rotating shaft thrust receiving surface and the lower shaft receiving thrust surface from sliding. It is thus possible to improve machine efficiency and sliding noise and prevent occurrence of objectionable noise Men the rotational speed of the compressor changes suddenly in starting the compressor.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary hermetic compressor used in air conditioners, refrigerators, etc.

0002

[Prior Art] Japanese Patent Publication No. 62-11200 discloses a rotary hermetic compressor in which an electric element and a compression element rotationally driven by the electric element are housed in an airtight container having a suction pipe and a discharge pipe. Are listed.

Its structure is as shown in FIGS. 5 and 6. The airtight container 10 includes a suction pipe 10a and a discharge pipe 10.
A stator 11 and a rotor 12 constituting electric elements and a cylinder 14 constituting a compression element are housed in this closed container 10. A rotating shaft 13 press-fitted into the rotor 12 is supported by an upper bearing 15 and a lower bearing 16. The upper bearing 15 and the lower bearing 16 are bolted to the cylinder 14. A valve cover 17 forms a discharge muffler chamber, and is bolted to the lower bearing 16. A piston 18 arranged inside the cylinder 14 is fixed to the rotating shaft 13.

[0004] In the compressor configured as above,
The refueling will be explained. At the bottom of the airtight container 10,
Lubricating oil 19 is stored. As the rotating shaft 13 rotates, the lubricating oil 19 is supplied from the oil inlet 22 provided at the bottom of the rotating shaft 13 by a spiral blade 21 attached to the hollow part 20 of the rotating shaft 13. 19 is pumped. The lubricating oil 19 that has been pumped up and stored in the hollow part 20 of the rotary shaft is attached to the bearings 15 and 16 on the end surface of the rotary shaft 13.
Oil is supplied from the hollow portion 20 through the oil supply hole 24 to a portion A that faces the end face of the rotating shaft 13 and a portion B where the crank portion 23 of the rotating shaft 13 and the piston 18 make sliding contact.

[0005]

[Problems to be Solved by the Invention] The thrust receiving surface 13a of the rotating shaft 13 and the thrust surface 16a of the lower bearing 16 are designed to absorb the weight of the rotor 12 of the stator 11 and rotor 12 that constitute the motor and the weight of the rotating shaft 13. It supports its own weight and has the largest sliding movement among rotary hermetic compressors.

In fact, when a rotary hermetic compressor is disassembled after several hours of operation, the metal scratches caused by sliding at the contact portion between the thrust receiving surface 13a and the thrust surface 16a are the most severe among the compression mechanism parts.

[0007] For this reason, there is a problem that not only does the mechanical efficiency decrease, but also abnormal noise is generated when the compressor is started or when the compressor rotational speed changes suddenly, and sliding noise is generated even during steady rotation. .

[0008] The present invention provides a rotary hermetic compressor that can improve the mechanical efficiency of the compressor and suppress abnormal noise and sliding noise that occur when the compressor is started or when the compressor rotational speed changes suddenly. The purpose is to

[0009]

[Means for Solving the Problems] The rotary hermetic compressor of the present invention houses a rotary compression mechanism section and a motor for driving the rotary compression mechanism section in a closed container, and drives the rotary compression mechanism. A rotating shaft is supported with the thrust receiving surface of the rotating shaft in contact with a lower bearing, and the lower end of the rotating shaft is immersed in lubricating oil stored at the bottom of the sealed container, and as the rotating shaft rotates, In a rotary hermetic compressor that pumps up the lubricating oil through the hollow part of the rotating shaft and supplies the pumped lubricating oil to each part from an oil supply hole drilled in the rotating shaft,
The present invention is characterized in that a groove is provided in the thrust receiving surface of the rotating shaft, and an oil supply hole is provided that communicates the groove with the hollow portion of the rotating shaft.

0010

[Operation] According to this configuration, the oil supply hole provided in the rotating shaft and the groove provided in the thrust receiving surface of this rotating shaft are provided at the boundary surface where the thrust surface of the lower bearing and the thrust receiving surface of the rotating shaft come into contact. By forcibly injecting lubricating oil and forming an oil film on this interface (sliding surface), the mechanical efficiency of the compressor is improved, and the problem that occurs when starting the compressor or when the compressor rotation speed changes suddenly. Suppresses abnormal noise and sliding noise caused by sliding of the thrust receiving surface and thrust surface.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 to 4. It should be noted that the same reference numerals are given to the parts having the same functions as those of the conventional example.

In addition to the conventional oil supply hole 24, the rotary shaft 13 of the rotary hermetic compressor of the present invention has a boundary surface C where the thrust surface 16a of the lower bearing 16 and the thrust receiving surface 13a of the rotary shaft 13 come into contact. A refueling hole 3 and a groove 4 are formed for refueling.

The lubricating oil 19 pumped up by the blade body 21 is pumped into the hollow part A where the end face of the rotary shaft 13 faces the end faces of the bearings 15 and 16 and a part B where the crank part 23 of the rotary shaft 13 and the piston 18 are in sliding contact. Part 20 and oil supply hole 2
It is lubricated after step 4. The lubrication method for sliding contact parts A and B is the same as in conventional compressors.

Furthermore, the lubricating oil 19 passes through the oil supply hole 3.
It reaches the thrust receiving surface 13a of the rotating shaft 13. As shown in FIGS. 1(a) and 3, a groove 4 is formed in the thrust receiving surface 13a, and the groove 4 continues to the oil supply hole 3. The thrust receiving surface 13a and the thrust surface 1 due to the centrifugal force of
6a, an oil film 5 is formed as shown in FIG. D indicates the rotation direction of the rotating shaft 13.

When the oil film 5 is formed on the interface between the thrust receiving surface 13a and the thrust surface 16a due to forced oil supply in this way, the metallic sliding between the two is suppressed and the compressor is Mechanical efficiency is improved, and sliding noise can be reduced to suppress compressor noise. moreover,
When the lubricating oil between the two is insufficient at startup or due to sudden changes in the compressor rotation speed, it plays the role of supplying lubricating oil and uses the cushioning effect of the lubricating oil to suppress abnormal vibrations and noise of the rotating shaft. can do.

[0016]

As described above, according to the present invention, a groove is provided in the thrust receiving surface of the rotating shaft, and an oil supply hole is provided that communicates this groove with the hollow part of the rotating shaft. It is possible to forcibly inject lubricating oil into the shaft thrust bearing surface and form an oil film on both sliding surfaces, improving the mechanical efficiency of the compressor, and when starting the compressor or when the compressor rotation speed changes suddenly. It is possible to suppress the abnormal noise generated by the thrust receiving surface and the sliding noise generated by the sliding of the thrust receiving surface and the thrust surface.

[Brief explanation of the drawing]

FIG. 1 is a front view and a side view showing details of a thrust surface of a rotating shaft in a rotary hermetic compressor of the present invention.

FIG. 2 is a sectional view of the rotary compressor mechanism of the device.

FIG. 3 is an enlarged view showing the positions of oil supply holes and grooves of the device.

FIG. 4 is an explanatory diagram showing an oil film formed between the thrust surface of the rotating shaft and the thrust surface of the lower bearing of the device.

FIG. 5 is a sectional view of a conventional rotary hermetic compressor.

FIG. 6 is a sectional view of a rotary compressor mechanism of a conventional rotary hermetic compressor.

[Explanation of symbols]

3 Oil supply hole 4 Groove 5 Oil film 10 Sealed container 11 Stator 12 Rotor 13 Rotating shaft 13a Thrust surface 14 of rotating shaft 13
Cylinder 16 Lower bearing 16a Thrust surface 18 of lower bearing 16
Piston 19 Lubricating oil 20 Hollow part 21 Vane body 22 Oil injection port 23 Crank part 24 Oil supply hole

Claims (1)

[Claims] Claim 1: A rotary compression mechanism and a motor that drives the rotary compression mechanism are housed in a sealed container, and a rotary shaft that drives the rotary compression mechanism is placed with the thrust receiving surface of the rotary shaft facing downward. The rotating shaft is supported in contact with a bearing, and the lower end of the rotating shaft is immersed in lubricating oil stored at the bottom of the sealed container, and as the rotating shaft rotates, the lubricating oil is pumped up through the hollow part of the rotating shaft. In the rotary hermetic compressor, the pumped lubricating oil is supplied to various parts from the oil supply hole drilled in the rotating shaft, and a groove is provided in the thrust receiving surface of the rotating shaft, and the groove and the hollow part of the rotating shaft are connected to each other. A rotary hermetic compressor with an oil supply hole that communicates with the