JPS6069295A - Rotary shaft structure for rotary compressor - Google Patents

Abstract

PURPOSE:To reduce unbalanced load acting on the rotary shaft and decrease a load for a motor by a method wherein an eccentric shaft is provided with an annular groove of a predetermined width, which is located at the opposite side of the rotary main shaft from the central part of shaft length, at the outer periphery thereof. CONSTITUTION:The eccentric shaft section 17 of the rotary shaft 14 is provided with the annular groove 23 having a predetermined width and located at the opposite side of the rotary main shaft 16 from the central part of the shaft length thereof at the outer periphery thereof. The center line 24 of the width of the annular groove is located so as to be approximated to the side of an auxiliary shaft 18 with respect to the center line 25 of the shaft length of the eccentric shaft section 17, therefore, a rotary mass, omnipresenting on the eccentric shaft section 17, is approximated to the center of mass of the whole of rotary shaft. Accordingly, the unbalanced loads for the rotary shaft and the motor may be decreased.

Description

Detailed Description of the Invention [Technical Field of the Invention] The present invention relates to a rotary shaft structure of a rotary compressor, and particularly to a rotary shaft structure of a rotary compressor that can reduce mechanical vibration of the compressor and its power consumption. Regarding.

[Technical Background and Problems of the Invention] Conventionally, in the rotating shaft of a rotary compressor, both ends of an eccentric shaft portion 1 are cut off to form a stepped portion 2, as shown in FIGS. An annular groove 3 is formed in the center of its axial length.
was formed.

These stepped portions 2 and annular grooves 3 reduce the contact area between the eccentric shaft portion 1 and the piston row 54 of the compressor section fitted into this eccentric shaft portion, thereby reducing wear resistance such as viscous resistance of lubricating oil. This was designed to reduce the load on the motor and reduce its power consumption.

On the other hand, one of the causes of vibration in a rotary compressor is the unevenly distributed rotating mass on the eccentric shaft, and the centrifugal force acting on this unevenly distributed rotating mass and the couple generated by this centrifugal force create an unbalanced load. It was causing mechanical vibration. Further, the unbalanced load acts as local pressure on the rotating system parts, that is, on each part of the rotating shaft, and there is a possibility that the sliding parts such as between the piston roller 4 and the eccentric shaft part 1 may seize.

Therefore, in order to reduce mechanical vibration and prevent seizure of the sliding parts of the rotating system, it is necessary to reduce the unbalanced load as much as possible. Furthermore, if the unbalanced load is reduced, the balance weight for balancing the rotating mass can also be lightened, and the load on the electric motor can be reduced, making it possible to reduce its power consumption.

However, the annular groove 3 of the eccentric shaft part 1 described above is formed so that its center line and the center line of the axial length of the eccentric shaft part 1 coincide, and the center is also shown in FIG. As shown in FIG. Met.

Furthermore, a proposal regarding a rotating shaft of a rotary electric compressor is disclosed in Utility Model Application Publication No. 4-23812, but even in the proposal described in this publication, the annular shape formed on the eccentric shaft portion The groove is provided in the center of the eccentric shaft, and by bringing the center of the rotating mass unevenly distributed in the eccentric shaft closer to the center of mass of the entire rotating shaft, the couple component as an unbalanced load can be reduced. Such an attempt had not been made.

[Object of the Invention] The present invention has been devised in view of the problems mentioned above and to improve them as much as possible.

An object of the present invention is to provide a rotary compressor that can reduce the mechanical vibration of the compressor and reduce the load on the electric motor to reduce its power consumption by reducing the unbalanced load acting on the rotary shaft of the rotary compressor. The purpose of this invention is to provide a rotating shaft structure.

[Summary of the Invention] The present invention provides a rotating shaft of a rotary compressor in which one end of the rotating main shaft is connected to a rotor of an electric motor and an eccentric shaft portion is formed at the other end. By forming a groove from the center of this shaft length on the side opposite to the main rotating shaft, and configuring the center of the rotating mass unevenly distributed in this eccentric shaft portion to be close to the center of mass of the rotating shaft, the eccentric shaft The above object is achieved by reducing the unbalanced load by reducing the couple generated in the parts.

[Embodiments of the Invention] A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 4 shows an outline of the rotary compressor 11.

As shown in the figure, the rotary compressor 11 mainly includes a motor 12 section and a compressor 13 section, and the motor 12 section and the compressor 13 section are connected by a rotating shaft 14.

The rotating shaft 14 includes a rotor 15 of the electric motor 12, a rotating main shaft 16 connected at one end to the rotor 15, an eccentric shaft portion 17 formed at the other end of the rotating main shaft 16, and an eccentric shaft coaxial with the rotating main shaft 16. It is composed of a subshaft 18 formed on the opposite side of the portion 17. A balance weight 19.19 is added to the rotor 15 in order to balance the rotating mass unevenly distributed on the eccentric shaft 17.

Reference numeral 20 denotes a cylinder housing of the compressor 13, and within the cylinder housing 20 is provided a piston roller 21 that is fitted onto and driven by the eccentric shaft portion 17.

5- Also, the rotating shaft 14 has a bearing portion 22.2 formed in the cylinder housing 20 by the rotating main shaft 16 portion and the sub-shaft 18 portion.
2 and is rotatably supported.

By the way, the feature of the present invention is that the rotating shaft 1
4, and as shown in the figure, an annular groove 23 having a predetermined width is provided on the outer periphery of the eccentric shaft 17, located from the center of the axial length on the opposite side to the rotational main shaft 16. There is a particular thing.

In other words, the annular groove 23 is formed at a position where the center line 24 of the groove width is closer to the counter shaft 18 side than the center line 25 of the axial length of the eccentric shaft portion 17, as shown in FIG. By being formed at this position, the center of the rotating mass unevenly distributed in the eccentric shaft portion 17 is configured to be close to the center of mass of the rotating shaft 14 as a whole.

Next, the operation of the present invention will be described.

In FIG. 4, the annular groove 23 is designed to reduce the contact area between the eccentric shaft portion 17 and the piston roller 21, thereby reducing the frictional resistance generated between them. By being formed at such a position, the mechanical vibration of the rotating shaft 14 and the load on the electric motor 12 can be reduced.

That is, since the rotating mass unevenly distributed on the eccentric shaft portion 17 approaches the center of mass of the rotating shaft 14 as a whole, the eccentric shaft portion 17
This will reduce the couple caused by the centrifugal force acting on the Therefore, the unbalanced load such as the vibration-exciting force of the rotating shaft 14 is reduced, and the mechanical vibration of the compressor 11 is reduced. Since the couple of forces applied to the rotating shaft 14 is reduced, galling of the rotating shaft 14 due to bending of the rotating shaft 14 can be prevented, and the sliding parts of the rotating shaft 14, such as the piston 21 and the eccentric shaft part 17, can be prevented from galling. Can prevent seizure. In addition, the local pressure applied to these sliding parts is also reduced, the frictional resistance is reduced, the load on the electric motor 12 is reduced, and its power consumption is suppressed.

Furthermore, as shown in FIGS. 6 and 7, if the center of the annular groove 23 is formed concentrically with respect to the main rotating shaft 16 and the sub-shaft 18, the mass of the eccentric shaft portion 17 can be reduced, and
Uneven distribution of rotating mass in this annular groove 23 portion is eliminated, and the unbalanced load is further reduced. As a synergistic effect, the mass of the balance weights 19 and 19 shown in FIG. 4 can also be reduced, and the mass of the entire rotating shaft 14 can be significantly reduced, making it possible to reduce the load on the electric motor 12. Also, since the balance weight 19.19 is made lighter and smaller, its windage loss is reduced, and the electric motor 1
The load on the motor 2 is also reduced, and the power consumption of the electric motor is reduced.

[Effects of the Invention] In summary, the present invention exhibits the following excellent effects.

(1) Since the rotating mass unevenly distributed on the eccentric shaft is brought closer to the center of mass of the entire rotating shaft, the couple acting as an unbalanced load generated on the eccentric shaft is reduced, and the vibrational force of the rotating shaft is reduced. Therefore, the mechanical vibration of the compressor can be reduced as much as possible.

(2) Since the couple of forces applied to the rotating shaft is reduced, galling due to bending of the rotating shaft can be prevented, and the sliding parts of the rotating shaft, such as the piston roller and eccentric shaft, can be prevented from seizing.

(3) The local pressure applied to the sliding part of the rotating shaft is reduced,
The frictional resistance is reduced and the load on the electric motor is reduced.
The power consumption of the electric motor can be reduced.

(4) It has a simple structure, can be provided at low cost, and is highly useful.

[Brief Description of the Drawings] Fig. 1 is a partial plan view showing the eccentric shaft portion of a conventional rotary compressor, Fig. 2 is a partial plan view showing the eccentric shaft portion of another conventional rotary compressor, and Fig. 3 is a view taken along the line ■-■ in Fig. 2, Fig. 4 is a schematic side sectional view showing a rotary compressor in which the rotating shaft of the present invention is adopted, and Fig. 5 shows the eccentricity of the rotating shaft shown in Fig. 4. FIG. 6 is a partial enlarged view showing the eccentric shaft portion of the rotating shaft of the modified embodiment. FIG.
It is a line arrow view. In the figure, 1.17 is an eccentric shaft, 3.23 is an annular groove, 11 is a rotary compressor, 12 is an electric motor, 19-4 is a rotating shaft, 15 is a rotor, 16 is a rotating main shaft, and 21 is a piston roller. . Representative Patent Attorney Kensuke Chika (1 other person) 10- Figure 1 Figure 2 Figure 3 Figure 4

Claims (2)

[Claims] (1) In the rotating shaft of a rotary compressor, which is formed by connecting one end of the rotating main shaft to the rotor of an electric motor and forming an eccentric shaft portion on the other end side for driving a piston roller, this A rotating shaft structure for an 0-tary compressor, characterized in that an annular groove having a predetermined width is provided at the center of the shaft length on the opposite side of the main rotating shaft. (2) The rotating shaft structure of a rotary compressor according to claim 1, wherein the annular groove is formed concentrically with respect to the main rotating shaft.