JPH0267493A - Rotary compressor - Google Patents

Abstract

PURPOSE:To enhance the extent of volumetric efficiency by installing a cylinder, provided with a circular cam storage chamber being superposed on a compression space, and a swing can partitioning this compression space into both high and low pressure chambers, respectively. CONSTITUTION:Since a cam storage chamber 30 is formed into circular sectional form, it is formable through grinding finish by means of cylindrical grinding like a compression space, and high dimensional accuracy is securable so that a clearance between a swing cam 32 and the cam storage chamber 30 can be set to be very little. Moreover since this clearance between the cam 32 and the cam storage chamber 30 is interconnected to the side of a low pressure chamber of the compression space 9, lubricating oil 14 is sucked out of an oil filler port 38, and the clearance between the cam 32 and the storage chamber 30 is lubricated, and simultaneously penetration of high pressure gas in a space 16 of a hermetically sealed vessel into the compression space 9 comes to very little in quantity, thus extremely high volumetric efficiency is securable.

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 4 and 5 are JP-A-62
This figure shows a cross section of the rotary compressor seen in No. 219491, in which 1 is a closed container in which a motor 4 consisting of a stator 2 and a rotor 3, and a compression device 15 driven by this motor 4 are housed. 6 is the shaft and eccentric part 7
have. 8 is a cylinder that forms a compression chamber 9 concentrically with the center of rotation of the shaft 5; 10.11 hermetically closes both sides of the cylinder 8;
The main side housing and the sub side housing support the main side housing. A roller 12 is attached to the eccentric portion 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. 17 is a C-shaped spring,
The vane 13 is pressed against the roller 12. Reference numeral 2o designates a suction pipe, one end of which is press-fitted into the sub-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. 21 is a discharge pulp provided in the sub-side housing 11; 22 is an opening 23;
This is a discharge muffler having a structure, 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). Reference numeral 14 denotes 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 6, and 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 valve 21 into the discharge muffler 22, the compressed gas is discharged from the opening 2.
3, it is opened to the closed container internal space 16, 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 order to form the notch, broaching is performed, but the accuracy of the inner surface of the vane groove 6 obtained by this process is far worse than the accuracy obtained by finishing by grinding. Therefore vane 1
If the clearance with the vane 13 fitted into the ft6 is not wide enough, locking will occur due to prying. However, if the clearance is wide, the space inside the closed container 1
Since the compressed gas enters the low pressure chamber of the compression chamber 9, there is a problem in that the volumetric efficiency becomes low.

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 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; The cam has a substantially cylindrical shape with a notch of curvature, is rotatably stored in the cam storage chamber, and has one end pressed against the outer circumference of the roller by a rotational force applied by an elastic member such as a spring. The compression element includes a swing cam that partitions the compression chamber into a high pressure chamber side and a low pressure chamber side.

Effect of the Invention 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 the grinding by cylindrical polishing, and high precision can be obtained. Immediately after the discharge stroke ends, low pressure Since the side is occluded, re-expansion losses are reduced.

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 have the same structure and # construction will be omitted. In FIGS. 1 and 2, 3o is a cam storage chamber formed in a circular shape that overlaps the compression chamber 9 of the cylinder 8. A swing cam 32 has a substantially cylindrical shape with a notch 33 having the same curvature as the outer diameter of the roller 12, and is rotatably housed in the cam housing chamber 30. A spring 36 has one end fixed to the end surface of the cylinder 8 and the other end fixed to the outer surface of the swing cam 32, and by being pulled in the direction of the arrow, always applies a rotational force in a fixed direction to the swing cam 32.

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 suction chain 2
0 indicates a communicating hole. Reference numeral 38 denotes an oil supply hole formed in the cylinder 8, the negative end of which communicates with the lubricating oil 14 stored at the bottom of the closed container 1, and the other end of which 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 36, one end is pressed against the outer periphery of the rolling roller 12, and the compression chamber 9 is divided into a high pressure chamber side and a low pressure chamber side. The gas sucked in from the suction tube 20 for partitioning is sucked into the low pressure chamber side of the compression chamber 9, and after being compressed, it passes through the discharge notch 36 to the discharge pulp 21.
It is discharged from the discharge muffler 22 into the discharge muffler 22. Cam storage chamber 30
Since it has a circular cross-sectional shape, it can be formed by cylindrical polishing like the compression chamber 9, making it possible to obtain a very good inner surface roughness and a high dimensional accuracy. Therefore, the clearance between the swing cam 32 and the cam storage chamber 3o can be set extremely small.

Further, since the gap between the swing cam 32 and the cam storage chamber 30 communicates with the low pressure chamber side of the compression chamber 9, the lubricating oil 14 is sucked through the oil supply hole 38, and the gap between the swing cam 32 and the cam storage chamber 3o is In addition, since the oil seal is perfect and only a small amount of high-pressure gas from the closed container interior space 16 enters the compression chamber 9, 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.

FIG. 3 shows a part of the suction-compression stroke of this embodiment, and continuously represents the state from the end of the compression stroke to the start of the next compression stroke. In FIG. 3, in the present invention, since the curvature of the notch 33 of the swing cam 32 is made to match the curvature of the outer diameter of the roller 12, the discharge notch 36 communicates with the low pressure chamber side. Since the cam 32 is almost in close contact and the through hole 37 is closed, the discharge notch 3
The re-expansion portion of the portion 6 does not affect the intake gas amount, and the volumetric efficiency can be improved.

In this embodiment, a horizontal rotary compressor has been described, but according to the present invention, a vertical rotary compressor may be used, and the same effect can be obtained whether the compressor is of a high pressure type or a low pressure type in a closed container.

Effects of the Invention As described above, the present invention includes a motor that stores lubricating oil in a closed container 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 cylinder having a compression chamber formed concentrically with the center of rotation and a circular cam storage chamber overlapping the compression chamber, and a side housing that airtightly closes both sides of the cylinder and pivotally supports the shaft. and,
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 with the same curvature as the outer diameter of the roller;
The cam is rotatably stored in the cam storage chamber, and one end is pressed against the outer circumference of the roller by the rotational force applied by an elastic member such as a spring, thereby separating the compression chamber into a high-pressure chamber and a low-pressure chamber. By having a compression element equipped with a swing cam that partitions, only a small amount of high-pressure gas can enter the compression chamber, and at the end of the discharge stroke, the low-pressure side is closed, reducing re-expansion loss and achieving 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, and FIG. 3 is a suction--
FIG. 4 is a sectional view of a conventional rotary compressor, and FIG. 5 is a sectional view taken along line BB in FIG. 4. 1... Airtight container, 6... Shaft, 7
...Eccentric part, 8...Cylinder, 9...
...Compression chamber, 1o...Main side housing, 11...Sub side housing, 12...
...Roller, 14...Lubricating oil, 30...
・Cam storage chamber, 32... Swing cam, 33.
...Notch, 35...Spring. Name of agent: Patent attorney Shigetaka Awano and 1 other person!
- Swamp Container 5-・Shaft 7-1 Leakage tji La θ・-Schilling? -・-Pressure IIai! 10-...Main size ID housing 1j--91 Side housing 12-〇-Ra 14...Bullet bulge 32...-Suisora Dum 30- Cam accommodation MA difference 33--1 Possible part 35-- -Spring Diagram 8 8″ I Diagram

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. Also, a side housing that pivotally supports the shaft, a roller that is fitted in the eccentric part and rolls along the inner wall of the compression chamber as the shaft rotates, and a notch that has the same curvature as the outer diameter of the roller. The cam has a substantially cylindrical shape having a section, is rotatably stored in the cam storage chamber, and has one end pressed against the outer circumference of the roller by an elastic member, thereby partitioning the compression chamber into a high pressure chamber side and a low pressure chamber side. A rotary compressor having a compression element with a swing cam.