JPH01232194A - Rotary compressor - Google Patents

Abstract

PURPOSE:To make any penetration of high pressure gas into a compression space into the smallest possible extent by installing a swing cam whose one end is pressed to the outer circumferential part of a roller, while installing an interconnecting hole, whose one end is interconnected into lubricating oil and the other end to an inner surface of a cam storage space respectively, in a cylinder. CONSTITUTION:Since a swing cam 32 is always give constant directional turning effort by a spring 35, it is pressed to the circumference of a roller 12 whose one end rolls, partitioning off a compression space 9 into both high and low pressure sides. In addition, a clearance between the swing cam 32 and a cam storage space 30 is interconnected to the low pressure chamber side of this compression space 9, so that lubricating oil 14 is absorbed out of an interconnecting hole 38, lubricating a clearance between the swing cam 32 and the cam storage space 30, and simultaneously bringing an oil seal to perfection.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a rotary compressor for a refrigeration cycle used in household refrigerators and the like.

BACKGROUND OF THE INVENTION In recent years, rotary compressors in the refrigeration and air conditioning industry have become extremely popular in the market.

An example of a conventional rotary compressor will be described below with reference to the drawings. Figures 3 and 4 show cross-sections of the rotary compressor found in Japanese Patent Publication No. 62-219491, in which 1 is a sealed container, and a motor 4 consisting of a stator 2 and a rotor 3; A compression device 16 driven by 4 is housed therein. 5 is a shaft having an eccentric portion 7; 08 is a cylinder that forms a compression chamber 9 concentrically with the center of rotation of the shaft 5; 10.11 is a shaft that airtightly closes both sides of the cylinder 8; 5, a main side housing and a sub side housing. A roller 12 is attached to the first crystal center 7 and rolls along the inner wall of the compression chamber 9. Reference numeral 6 denotes a vane groove cut out in the cylinder radial direction, and 13 is a vane fitted into the vane groove 6 and in contact with the roller 12 to partition the compression chamber 9 into a high pressure chamber side and a low pressure chamber side. A C-shaped spring 17 presses the vane 13 against the roller 12.

Reference numeral 2Q denotes a suction pipe, one end of which is press-fitted into the auxiliary side housing 11, opens to the low pressure chamber side of the compression chamber 9, and the other end is connected to the low pressure side of the system (not shown) outside the closed container 1. 2
1 is a discharge pulp provided in the sub-side housing 11, 22
is a discharge muffler having an opening 23 and is attached to the sub-side housing 11. Reference numeral 24 denotes a discharge pipe, one end of which opens into the closed container interior space 16, and the other end connected to the high pressure side of the system (not shown). 14 is lubricating oil, which is stored in the closed container 1.

In the above configuration, the rotation of the rotor 3 is transmitted to the shaft 5, and the row 212 attached to the eccentric part 7 is compressed, and the vane rolls in the return chamber 9 and is pressed against the row 212 by the C-shaped spring 17. 13 partitions the inside of the compression chamber 9 into a high pressure chamber side and a low pressure chamber side, so that gas sucked through the suction pipe 20 is continuously compressed. After the compressed gas is discharged from the discharge pulp 21 into the discharge muffler 22, it is released into the airtight container internal space 16 through the opening 23, and is discharged into the discharge pipe 24.
It is discharged from.

Problems to be Solved by the Invention However, in the above configuration, generally the vane groove 6
In forming the notch, broaching is performed, but the accuracy of the inner surface of the vane groove 6 by this process is far worse than the accuracy obtained by grinding. Therefore, if the clearance with the vane 13 inserted into the vane groove eK is not wide enough, locking due to prying will occur. However, if the clearance is wide, the compressed gas from the airtight container interior space 16 will not enter the low pressure chamber of the compression chamber 9;
This had the problem of low volumetric efficiency.

In view of the above problems, the present invention provides a rotary compressor with high volumetric efficiency.

Means for Solving the Problems In order to solve the above problems, the rotary compressor of the present invention stores lubricating oil in a closed container, and includes a motor consisting of a stator and a rotor, and a motor fitted into the rotor. A shaft that is fixed and has an eccentric portion, a cylinder that has a compression chamber formed concentrically with the center of rotation of the shaft and a circular cam storage chamber that overlaps the compression chamber, and both sides of the cylinder that are airtight. a side housing for pivotally supporting the shaft; a roller fitted in the eccentric portion and rolling along the inner wall of the compression chamber as the shaft rotates; and a notch. It has a substantially cylindrical shape and is rotatably stored in the cam storage chamber,
The compression element includes a swing cam that partitions the compression chamber into a high pressure chamber side and a low pressure chamber side by pressing one end of the outer peripheral part of the roller into contact with the rotational force applied by a spring or the like; A communication hole is bored in the cam housing, with one end communicating with the lubricating oil and the other end communicating with the inner surface of the cam housing chamber.

Effects According to the present invention, with the above-described configuration, the inner surface of the cam storage chamber has a circular cross-sectional shape, so that it is possible to finish it by cylindrical polishing, and high accuracy can be obtained.

EXAMPLES Hereinafter, examples of the present invention will be described with reference to the drawings. Note that parts that are the same as those in the conventional example will be described using the same reference numerals, and parts that are the same in structure and operation will be omitted. In FIGS. 1 and 2, numeral 30 is a cam storage chamber formed in a circular shape that overlaps the compression chamber 9 of the cylinder 8. A swing cam 32 is approximately cylindrical in shape with a notch 33, and is rotatably housed in the cam storage chamber 3Q. 36 is a spring, one end of which is connected to the white end surface of the cylinder, and the other end of which is connected to the swing cam 3.
2, and by pulling it in the direction of the arrow, it always applies an oral force in a constant direction to the swing cam 32.

36 is a discharge notch provided on the high pressure chamber side of the compression chamber 9 and faces the discharge pulp 21.

3 is a mark indicating the position where the suction tube 2o communicates. 38 is a communication hole bored in the cylinder 8;
One end communicates with the lubricating oil 14 stored at the bottom of the closed container 1, and the other end communicates with the inner surface of the cam storage chamber 30.

In the above configuration, since the swing cam 32 is always given a rotational force in a fixed direction by the spring 35, one end is pressed against the outer periphery of the rotating roller 12, and the compression chamber 9 is partitioned into a high pressure chamber side and a low pressure chamber side. Therefore, the gas sucked from the suction tube 20 is sucked into the low pressure chamber side of the compression chamber 9, passes through the discharge notch 36, is discharged from the discharge pulp 21 into the discharge muffler 22, and then passes through the opening 23 into the closed container. It is opened to the space 16 and discharged from the discharge pipe 24.

Since the cam storage chamber 3o has a circular cross-sectional shape, it can be formed by cylindrical polishing, similar to the compression chamber 9, and it is possible to obtain a very good inner surface roughness. Since high dimensional accuracy is obtained, the clearance between the swing cam 32 and the cam storage chamber 30 can be set extremely small. Also swing cam 32
The gap between the cam storage chamber 3o and the low pressure chamber side of the compression chamber 9 lubricates the low pressure chamber side of the compression chamber 9, and also ensures that the oil seal is complete and that the high pressure gas in the airtight container interior space 16 enters the compression chamber 9 in a small amount. Extremely high volumetric efficiency can be obtained. In addition, the high dimensional accuracy eliminates the need for selective fitting, reducing stock of parts and improving productivity.

Effects of the Invention As described above, the present invention includes a motor that stores lubricating oil in a closed container C and is composed of a stator and a rotor, a shaft that is fitted and fixed to the rotor and has an eccentric portion, and a motor that stores lubricating oil in a closed container C. A cylinder having a compression chamber formed concentrically with the center of rotation and a circular cam storage chamber overlapping the compression chamber; a side that pivotally supports the shaft; housing and
a roller that is fitted in the eccentric portion and rolls along the inner wall of the compression chamber as the shaft rotates; One end is pressed against the outer circumference of the roller by the rotational force applied by the roller, etc.
A compression element is provided with a swing cam that partitions the compression chamber into a high pressure chamber side and a low pressure chamber side, and a communication hole is bored in the cylinder, one end communicating with the lubricating oil and the other end communicating with the inner surface of the cam storage chamber. As a result, the amount of high-pressure gas that enters the compression chamber is minimized, and extremely high volumetric efficiency can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a rotary compressor according to an embodiment of the present invention, FIG. 2 is a sectional view taken along line A-A in FIG. 1, FIG. 3 is a sectional view of a conventional rotary compressor, and FIG. FIG. 3 is a sectional view taken along line BB in FIG. 3; 1... Airtight container, 6... Shaft, 7
...Eccentric part, 8...Cylinder, 9...
...Compression chamber, 10...Main case, 11...Sub-suite case, 12...
...Roller, 14...Lubricating oil, 3o...
...Cam storage room, 32...Swing cam, 33
...Notch, 35...Spring, 3
8...Communication hole. Name of agent: Patent attorney Toshio Nakao, 1 person, 9-
-Is it a good idea? -Roller Fig. 4 digging b

Claims (1)

[Claims] A motor comprising a stator and a rotor, which stores lubricating oil in an airtight container, and is fitted and fixed to the rotor,
A shaft having an eccentric portion, a cylinder having a compression chamber formed concentrically with the center of rotation of the shaft and a circular cam storage chamber overlapping the compression chamber, and both sides of the cylinder being airtightly closed. and a side housing that pivotally supports the shaft; a roller that is fitted in the eccentric portion and rolls along the inner wall of the compression chamber as the shaft rotates; and a substantially cylindrical shape having a notch; a swing cam rotatably housed in the cam storage chamber and having one end pressed against the outer periphery of the roller by a spring to partition the compression chamber into a high pressure chamber side and a low pressure chamber side; is in the lubricating oil,
A rotary compressor having a communication hole whose other end communicates with the inner surface of the cam storage chamber.