JPH01301978A - Low pressure type rotary compressor - Google Patents

Abstract

PURPOSE:To limit an amount of high pressure gas invading a compression chamber to an extremely small extent by installing a swing cam whose one end is brought in pressure contact with the periphery of a roller so as to partition the compression chamber into a high pressure chamber side and a low pressure chamber side. CONSTITUTION:A swing cam 32 is provided with a notch part 33 and rotatably housed inside a cam storing chamber 30 formed in a circular shape overlapping the compression chamber 9 of a cylinder 8. A spring 35 is enclosed inside the swing cam 32 and arranged to exert turning power on the swing cam 32 always in the direction of an arrow mark. Since the cam storing chamber 30 has its sectional shape formed in a circle, it can be formed by grinding finish through cylinder polishing in the similar way to that of the compression chamber 9, thus resulting in possibility of setting extremely good surface roughness of the inner face.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an improvement in a low-pressure 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 are JP-A-62
This shows a cross section of the rotary compressor seen in Publication No. 219491, where 1 is a closed container, stator 2 and rotor 3.
A motor 4 consisting of a motor 4 and a compression device 15 driven by the motor 4 are housed. 5 is a shaft having an eccentric portion 7. 8 is a cylinder that forms a compression chamber 9 concentrically with the center of rotation of the shaft 6; 10.11 is a main side housing that airtightly closes both sides of the cylinder 8 and supports the shaft 5;

This is the secondary side housing. Reference numeral 12 denotes a collar that is attached to the eccentric portion 7 and rolls along the inner wall of the compression chamber 9.

6 is a vane groove formed with a notch in the radial direction of the cylinder, 1
A vane 3 is fitted into the vane groove 6 and is in contact with the roller 12 to partition the compression chamber 9 into a high pressure chamber and a low pressure chamber. 17
is a C-shaped spring that presses the vane 13 against the roller 12.

Reference numeral 20 denotes a suction pipe, one end of which is press-fitted into the auxiliary side housing 11 and opens into the low pressure chamber 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).

In the above configuration, the rotation of the rotor 3 is transmitted to the shaft 6, the roller 12 mounted on the eccentric part 7 rolls in the compression chamber 9, and the vane 13 is pressed against the roller 12 by the C-shaped spring 17. By partitioning the compression chamber 9 into a high-pressure chamber side and a low-pressure chamber side, 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, the gas is discharged from the opening 2.
3, it is opened to the closed container internal space 1θ, and is discharged from the discharge pipe 24.

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 fitted into the vane groove 6 is not wide enough, locking due to prying will occur. However, if the clearance is wide, the compressed gas from the closed container internal space 16 will enter the low pressure chamber of the compression chamber 9.
This had the problem of low volumetric efficiency. Also,
Due to the above-mentioned drawbacks, a low-pressure rotary that maintains a low pressure inside the closed container cannot be realized, and since the compressed gas fills the space 16 inside the closed container, the amount of sealed gas becomes large, which is uneconomical.

The present invention addresses the above problems and provides a low-pressure 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 includes a motor comprising a stator and a rotor in a closed container;
a shaft that is fitted and fixed to the rotor and has an eccentric portion; a cylinder that has a compression chamber formed concentrically with the rotation center of the shaft and a circular cam storage chamber that overlaps the compression chamber; a side housing that airtightly closes both sides and 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 notch. The cam is rotatably stored in the cam storage chamber, and one end is pressed against the outer circumference of the roller by a rotational force applied by a spring or the like, thereby applying high pressure to the compression chamber. It has a compression element equipped with a swing cam that partitions into a chamber side and a low pressure chamber side.

Function: With the above-described configuration, the inner surface of the cam storage chamber has a circular cross-sectional shape, so it is possible to finish it by cylindrical polishing, and high precision can be obtained, as well as improved sealing performance. , it becomes possible to realize a low-pressure rotary compressor.

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, 26 is a discharge muffler airtightly formed in the sub-side housing 11, and 2 is a discharge pipe, one end of which is connected to the discharge muffler, and the other end is connected to the high pressure side of the system (not shown). It is connected. 28 is a suction pipe, and one end is the space 1 inside the closed container.
The other end communicates with the low pressure side of the system (not shown) outside the closed container 1.

A cam storage chamber 30 is formed in a circular shape and 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 30. A spring 36 is built into the swing cam 32 and always applies a rotational force to the swing cam 32 in the direction of the arrow. 36 is a discharge notch provided on the high pressure chamber side of the compression chamber 9, and is opposed to the discharge pulp 21.

37 is a mark indicating a position corresponding to a suction hole (not shown) provided in the sub-side housing 11.

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 rolling roller 12, and the compression chamber 9 is divided into the high pressure chamber side and the low pressure chamber side. In order to partition the gas, the gas sucked from the suction tube 2o is sucked into the low pressure chamber side of the compression chamber 9 through the airtight container interior space 1θ through the suction hole, and the compressed gas is sucked from the discharge pulp 21 through the discharge notch 36. After being discharged into the discharge muffler 22, it is discharged from a discharge pipe 27 to a system (not shown).

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 3o can be set extremely small. Therefore, the amount of gas leaking from the high pressure chamber side to the low pressure chamber side through the gap between the swing cam 32 and the cam storage chamber 3o is very small.
Since the compressed gas is sealed by the auxiliary side housing 11 and the auxiliary side housing 11, almost no compressed gas leaks into the closed container inner chamber 16, so that a low-pressure rotary compressor with extremely high volumetric efficiency can be obtained. In addition, due to high dimensional accuracy, selective fitting is not necessary, reducing parts stock and improving productivity.

Effects of the Invention As described above, the present invention includes a motor including a stator and a rotor in a sealed container, a shaft fitted and fixed to the rotor and having an eccentric portion, and a motor compressed concentrically with the center of rotation of the shaft. a cylinder that forms a chamber and a circular cam storage chamber M in the compression chamber; a side housing that airtightly closes both sides of the cylinder and pivotally supports the shaft; and the eccentric portion. a roller that is fitted into the cam storage chamber and rolls along the inner wall of the compression chamber as the shaft rotates; The compression element includes a swing cam that partitions the compression chamber into a high-pressure chamber and a low-pressure chamber by having one end pressed against the outer circumference of the roller by the rotational force applied by the roller. The amount of intrusion into the compression chamber is minimal, and a low-pressure rotary compressor with 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, 1o...Main side housing, 11...Sub side housing, 12...
...Roller, 30...Cam storage L32...
...Swing cam, 33...Notch, 36...
····spring. Name of agent: Patent attorney Toshio Nakao and 1 other person/-
11 Isamu Shukoai 30- Cam income? Sumire, 13--! Figure 2

Claims (1)

[Claims] a motor including a stator and a rotor in a sealed container; a shaft fitted and fixed to the rotor and 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; both sides of the cylinder being hermetically closed, and the shaft being pivotally supported. a side housing that is fitted into the eccentric portion and rolls along the inner wall of the compression chamber as the shaft rotates; The compressor element includes a swing cam which is housed in a swing cam and which partitions the compression chamber into a high pressure chamber side and a low pressure chamber side by having one end pressed against the outer periphery of the roller by a rotational force applied by a spring or the like. Low pressure rotary compressor.