JPH0842473A - Rotary compressor - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent wear and seizure in the sliding parts between the rollers and vanes of a rotary compressor. [Structure] In a rotary compressor, the tip of the vane has a structure that does not adversely affect the rollers.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary positive displacement machine, and more particularly to a rotary compressor suitable for use in a refrigerating cycle of a refrigerator or an air conditioner.

[0002]

2. Description of the Related Art In a conventional rotary compressor, for example, as described in Japanese Utility Model Laid-Open No. 63-112291, the arcuate portion at the tip of the vane has the same radius of curvature.

[0003]

SUMMARY OF THE INVENTION In the above conventional technique,
Since there is a line contact between the vane and the roller contact and it is difficult to form an oil film, wear is likely to occur and the reliability of the compressor is reduced.

An object of the present invention is to reduce the surface pressure between the tip of the vane and the outer circumference of the roller in the rotary compressor to reduce the wear.

[0005]

In order to achieve the above object, the present invention is configured such that a curved portion at the center of an arc portion at the tip of a vane has a peripheral portion having a radius of curvature larger than that of the curved portion at the center. , A concave curve or a plane.

[0006]

In the structure of the means for solving the above problems, the peripheral portion of the curved portion of the arc portion at the tip of the vane has a radius of curvature larger than that of the curved portion of the central portion, or a concave shape. By using a curved surface or a flat surface, it is possible to reduce the surface pressure on the outer side of the roller tip where the sliding condition is bad, and improve the wear resistance.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. 1 is a sectional view showing a rotary compressor according to an embodiment of the present invention, FIG. 2 is a sectional view taken along the line AA in FIG. 1, and FIG. 3 is a sectional view when a motor for driving the compressor is rotated by 90 °. 4 is an enlarged view of the pump portion in FIG. 1, and FIGS. 5, 6 and 7 are enlarged views of the tip of the vane.

In the embodiment of the present invention shown in FIG. 1, a cylinder 1 is formed with a cylindrical inner peripheral surface 1a at the center thereof, and the first plate member 2 and the second plate are closed so that both ends thereof are closed. The member 3 and the member 3 are fixed by bolts 4.
At that time, the central axes of the holes 2b and 3b formed in the boss portions 2a and 3a at the central portions of the first plate member 2 and the second plate member 3 are the central axes of the cylindrical inner peripheral surface 1a of the cylinder 1. It is fixed so that it is coaxial. The outer peripheral portion of the cylinder 1 to which the first plate member 2 and the second plate member 3 are fixed is fixed to the chamber 5. The stator 5 of the compressor driving motor is fixed to the chamber 5. A rotor portion 7 is present on the inner circumference of the stator portion 6 with a minute gap therebetween to form a pair of compressor motors. Further, a crankshaft 8 is fixed to the inner circumference of the rotor portion 7. Further, the crankshaft 8 is formed with a cylindrical crank pin portion 8a that is eccentric to the central axis of the crankshaft 8 at a position corresponding to the cylindrical hole portion 1a of the cylinder 1.

A vane slot 1b is formed on the outer side of the cylindrical inner peripheral surface 1a of the cylinder 1, and the space at the center of the cylinder and the outer side of the vane slot 1b are located on the cylinder center side and the opposite side of the vane slot 1b, respectively. It communicates with the spring hole 9 provided in the. Vane 10 is vane slot 1
The spring 11 inserted in the spring b is inserted in the spring hole 9b.
Is abutted against the rollers 12 and, as a result, the vane 1
0 is supported by the cylinder 1 so that it can move back and forth within the vane slot 1b.

With the above construction, when the rotor portion 7 of the compressor driving motor rotates, the crankshaft 8 fixed to this also rotates. Along with this, the crank pin portion 8a formed eccentrically on the crankshaft 8 also rotates, and the roller 12 is revolved. FIG. 3 is a diagram showing the movement of the roller 12 and the vane 10 when the rotor portion 7 of the compressor driving motor is rotated by 90 °. The roller 12 has a cylindrical inner peripheral surface 1a and a cylindrical inner peripheral surface 1a. The vane 10 abuts against the roller 12 and moves forward and backward by eccentrically rotating from the center of the surface 1a. Therefore, the cylinder 1, the roller 9, the vane 12, the first plate member 2, and the second plate member 3 form a compression chamber that is a closed space, and as the rotor portion 7 of the compressor driving motor rotates, the compression chamber shown in FIG. Repeat the increase and decrease of the volume like.

A first side chamber 13 and a second side chamber 14 are welded to the openings at both ends of the chamber 5,
A closed container is formed as a whole. The working gas flows into the compressor through the suction port 15, passes through the suction passage 1c formed in the cylinder 1, and then is sucked and compressed in the compression chamber due to the increase or decrease in the volume of the compression chamber, and is formed on the second plate member 3. Is discharged from the discharge port (not shown) through the discharge valve 18 and the discharge valve retainer 17. Then, the discharge port 1 provided in the second side chamber 14 passes through the motor chamber.
8 flows out of the compressor.

The arc at the tip of the vane 10 is constituted by a curved surface 20 having a radius of curvature larger than that of the arc portion 19 in the peripheral portion of the arc portion 19 at the central portion of the vane thickness, or the central portion of the vane thickness is convex. The curved surface 21 has a convex curved surface 21 and the peripheral portion thereof is a concave curved surface 22 having a concave shape. Alternatively, the central portion of the vane thickness is a convex curved surface 23 and the peripheral portion thereof is a flat surface 24.

According to the present embodiment, the arc of the tip of the vane 10 is constituted by a curved surface 20 having a radius of curvature larger than that of the circular arc portion 19 with respect to the circular arc portion 19 of the central portion, or a convex portion at the central portion. The convex curved surface 21 and the peripheral portion thereof are constituted by the concave curved surface 22 or the central portion of the vane thickness is constituted by the convex convex curved surface 23 and the peripheral portion thereof is constituted by the flat surface 24. When the sliding condition between the roller 12 and the roller 12 is 90 degrees or 270 degrees in the plane of FIG. 3, the contact pressure can be reduced and wear resistance can be secured.

[0014]

According to the present invention, it is possible to reduce the surface pressure of a sliding portion having a high surface pressure locally in a rotary compressor, and especially when used in a compressor for refrigeration and air conditioning. It is possible to provide a rotary compressor which is reliable not only for the above refrigerant but also for a refrigerant containing no chlorine.

[Brief description of drawings]

FIG. 1 is a side sectional view showing a rotary compressor according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA in FIG.

FIG. 3 is an explanatory view of the movement of each component in FIG. 2 when the motor for driving the compressor is rotated by 90 °.

FIG. 4 is an enlarged view of a pump portion in FIG.

FIG. 5 is an enlarged view of the tip of the vane.

FIG. 6 is an enlarged view of the tip of the vane.

FIG. 7 is an enlarged view of the tip of the vane.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Cylinder, 1a ... Cylindrical inner peripheral surface, 2 ... 1st plate member, 2a, 3a ... Boss part, 2b ... Hole part, 3 ... 2nd plate member, 3a ... Boss part, 4 ... Bolt, 5 ... Chamber ,
6 ... Motor stator part, 7 ... Motor rotor part, 8 ...
Crank shaft, 8a ... Shaft pin portion, 9 ... Spring hole, 10 ... Vane, 11 ... Spring, 12 ... Roller, 13 ...
First side chamber, 14 ... Second side chamber, 15
... Suction port, 16 ... Discharge valve, 17 ... Discharge valve retainer, 18 ...
Outlet.

Claims (1)

[Claims] 1. A cylinder having a cylindrical inner peripheral surface, a plurality of side plates closing both ends of the cylindrical inner peripheral surface of the cylinder, and a space surrounded by the cylinder and the plurality of side plates. Among them, the cylindrical outer peripheral surface of the cylinder makes an orbital motion while always maintaining a minute gap with the cylindrical inner peripheral surface of the cylinder, a driving machine that gives an orbital motion to the roller, and the cylindrical shape of the cylinder. The component has a vane for partitioning an enclosed space surrounded by the inner peripheral surface, the cylindrical outer peripheral surface of the roller and the side plates into a plurality of enclosed spaces, and the plurality of the vanes are formed along with the revolution movement of the roller. In a rotary compressor that compresses gas by utilizing the change in volume of each enclosed space, the arcuate portion of the vane tip has a peripheral portion with respect to the radius of curvature of the central portion of the vane thickness. Rotary compressor which is characterized in that a large radius of curvature.