JPS6275092A - Rotary compressor - Google Patents

Abstract

PURPOSE:To reduce the friction loss of a main bearing and to decrease an electric current to a small value in a compressor when it is started, by cutting a crank part, so that its center of gravity is obtained on a plane containing the center axis of a main shaft and the center axis of the crank part, and reducing weight while centrifugal force or the like acting on the main shaft. CONSTITUTION:A center axis of a crank part 4 in a main a shaft 3 is eccentrically positioned in a distance 22 from a rotary axis 21 of the main shaft 3. Circular through holes 23 are provided in an eccentric direction of the crank part 4, and the center of gravity 24 of the crank part 4 is moved in the direction of the rotary axis 21 of the main shaft 3 by these through holes 23. By this constitution, an operated rotary compressor, providing the through holes 23 n the crank part 4 to decrease weight to a light value, reduces centrifugal force acting on the main shaft 3, while the compressor, forming a balancer in light weight, also reduces bending moment acting on the main shaft 3. As a result, a main bearing eliminates scuffing, seizure, etc. with less friction loss, and the compressor, when it is started, can realize a low electric current value, thus enabling the rise up time to be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a rotary compressor having a notched crankshaft.

[Technical background of the invention and its problems]

In conventional rotary compressors, the center of gravity of the crankshaft is eccentric with respect to the rotational axis of the main shaft, so in order to balance the centrifugal force generated around the main shaft during operation, a balancer is installed above and below the rotor.

However, in recent years, due to high-speed operation using inverter control, the bending moment acting on the main shaft has increased, causing the upper part of the main shaft to touch, resulting in seizing in the main bearing, occurrence of galling, input, vibration, etc.
This was causing an increase in noise, etc.

In order to reduce this bending moment, there is a roller 100 in which a palancer 101 is attached to the main shaft 102, as shown in FIG. However, this method has the disadvantage that the structure becomes complicated because the parancer 101 is attached.

[Purpose of the invention]

The present invention aims to reduce the bending moment caused by the centrifugal force acting on the inner rotating shaft by combining and reducing the centrifugal force acting on the rotating shaft, and further to simplify the manufacturing process of the compression mechanism part. .

[Summary of the invention]

The present invention relates to a rotary compressor in which a crankshaft is cut out so that the center of gravity of the crankshaft lies on a plane containing the central axis of the main shaft and the central axis of the crankshaft.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a vertical sectional view of a compressor showing an embodiment of the present invention.

Reference numeral 1 denotes a container l forming a sealed space, in which a compression mechanism section is housed in the lower part and an electric mechanism part is housed in the upper part.

The compression mechanism section includes a cylinder 2 that is press-fitted into the container 1, and
The crank part 4 of the main shaft 3 has a roller 5 that rotates inside the cylinder 2, a blade (not shown) that comes into contact with the roller 5 and partitions the compression chamber into two spaces, and a blade that is urged to come into contact with the roller 5. A spring (not shown) and cylinder 2
The main bearing 8 is attached to the upper surface of the cylinder 2 and guides the main shaft 3, and the auxiliary bearing 10 is attached to the lower surface of the cylinder 2 and guides the auxiliary shaft portion 9 of the main shaft 3.

The electric mechanism section is connected to the compression mechanism section via the main shaft 3, and the main shaft 3 and the rotor 1 press-fitted onto the outer periphery of the main shaft 3.
1, a balancer 13 fixed above and below the rotor l],
The stator 12 is press-fitted into the container 1 and is spaced apart from the outer surface of the rotor 11 at a constant distance.

2 and 3 are a horizontal sectional view and a perspective view of the crank portion 4 of the main shaft 3 according to the present invention.

The central axis of the crank portion 4 of the main shaft 3 is eccentric by a distance n from the axis of rotation 21 of the main shaft 30 times. A circular through hole n is provided in the eccentric direction of the crank portion 4. This through hole causes the center of gravity of the crank portion 4 to move in the direction of the rotation axis 21 of the main shaft.

With this configuration υ, the rotary compressor operated is
By providing a through hole in the crank part 4 to reduce weight, the centrifugal force acting on the main shaft 3 is reduced, and by making the balancer lighter, the bending moment acting on the main shaft 3 is also reduced. 8, there is no steering or seizure, and friction loss is reduced. As a result, it is possible to reduce the current at startup and shorten the rise time. The graph in FIG. 4 shows the COP for each operating frequency of the conventional compressor and the compressor of the present invention. According to the present invention, the COP can be improved by several percent at all frequencies.

FIG. 5 shows another embodiment of the crank section, in which similar effects can be obtained.

〔Effect of the invention〕

From the above, according to the present invention, the power consumption at startup can be reduced;
This results in shorter start-up times, less seizure and galling in the main bearings, improved performance at all operating frequencies, and lower noise.

[Brief explanation of drawings]

Figures 1 to 5 relate to the present invention; Figure 1 is a vertical sectional view of the rotary compressor, Figure 2 is a horizontal sectional view of the crank part, Figure 3 is a perspective view of the crank part, and Figure 4 is the main body of the rotary compressor. A graph showing the COP at each operating frequency of the compressor of the invention and a conventional rotary compressor, FIG. 5 is a perspective view of another embodiment of the crank part, and FIG. 6 is a vertical sectional view of the conventional compressor. . 3...Main shaft, 4...Crank part. Agent Patent Attorney Noriyuki Chika (and 1 other person) 1. Suno! 11 斤面口 3rd
Eye crank sound 'PI) INPIJT POWEF FF:EQt/ENCγ(
H,) 4th concave

Claims (1)

[Claims] A rotary compressor having a compression mechanism section and an electric mechanism section, characterized in that the crank section is cut out so that the center of gravity of the crank section is on a plane containing the central axis of the main shaft and the central axis of the crank section.