JPH0792068B2 - Rotary compressor - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary compressor used in a refrigerating machine or the like.

2. Description of the Related Art In recent years, compressors used in freezers and refrigerating machines have been shifting from reciprocating type to rotating type from the viewpoint of energy saving and space saving. In these rotary compressors, a motor stator and a bearing or a cylinder of an electric compression element are usually fixed to a sealed case by welding or the like. Therefore, the vibration generated in the electric compression element is transmitted to the sealed case without being absorbed by the spring or the like, so that the sealed case may be vibrated to generate a large noise.

Hereinafter, an example of the conventional rotary compressor described above will be described with reference to the drawings.

FIG. 4 shows an example of a conventional rotary compressor.

In the figure, 1 is a rotary compressor, 2a is a shell shell, 2b is a substantially spherical front lid shell, 2c is a rear lid shell, and a shell shell is shown.
A front lid shell 2b and a rear lid shell 2c are welded and fixed to 2a to form a closed case 2. 3 is a stator and shell
It is fixed by shrinkage fitting to 2a. A motor rotor 4 is connected and fixed to the crankshaft 5. 6 is a piston,
7 is a cylinder. Reference numeral 8 denotes a rotor side bearing, which has three arms 8a radially in a radial direction, and the arms 8a are welded and fixed to the body shell 2a. Reference numeral 9 denotes a shaft end bearing, which supports the crankshaft 5 together with the rotor side bearing 8. Ten
Is press-fitted and fixed to the bearing 9 by a discharge cover.

The operation of the rotary compressor configured as described above will be described below.

Mainly in the cylinder 7, the pressure pulsation of the refrigerant generated by the compression of the refrigerant and the vibration generated by the mechanical collision are
Each component is vibrated, and the refrigerant or the like in the bearing 8 or the sealed case 2 is propagated and transmitted to the sealed case 2. Therefore, the closed case 2 vibrates and noise is generated. At that time, since the front lid shell 2b has a substantially spherical shape with a relatively large curvature, the natural vibration modes of the natural vibration mode of the front lid shell 2b deformed and vibrated in the axial direction and the natural vibration mode of the front lid shell 2b are deformed and vibrated at right angles. The numbers are staggered to reduce noise generation.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, in the above configuration, the body shell 2a in which the arm 8a portion of the bearing 8 is the node and the portion between the arms 8a and 8a is the belly
Deformation vibration in the radial direction is generated, and this vibration is generated as noise, so that noise reduction is insufficient.

In view of the above problems, the present invention prevents deformation vibration of the shell 2a in the radial direction without impairing the compactness of the compressor, and reduces the operating noise of the compressor.

Means for Solving the Problems In order to solve the above problems, a rotary compressor of the present invention is provided with a bearing having a plurality of arms radially in a radial direction, and at least one of cup-shaped lid shells is basically Is a substantially spherical shape, and extends a plurality of substantially rounded ridge lines having a relatively small curvature located between the arms of the bearing from the substantially central position of the lid shell toward the opening of the lid shell, In addition, the respective ridge lines are connected by a substantially curved surface having a relatively large curvature as compared with the radius of the ridge line.

Action The present invention is configured as described above, and suppresses the deformation vibration in the radial direction of the closed case, thereby preventing an increase in noise due to the deformation vibration of the closed case and reducing the noise.

Example A rotary compressor according to an example of the present invention will be described below with reference to the drawings. In order to avoid duplication of description, the same parts as those of the conventional example are designated by the same reference numerals and the description thereof will be omitted.

1 to 3 show an embodiment of the rotary compressor of the present invention. In the figure, 11a is a body shell, 11b is a front lid shell, 11c is a rear lid shell, and the front lid shell 11b and the rear lid shell 11c are welded and fixed to the body shell 11a to form a closed case 11. Further, although the front lid shell 11b is basically substantially spherical, it has three ridge lines 11br that are substantially rounded and have a relatively small curvature from the substantially central position toward the opening.
Each ridgeline 11br is connected by a substantially curved surface 11bh having a relatively larger curvature than that of the ridgeline, and the relative position of the ridgeline 11br is between the arms 8a of the bearing 8.

The operation of the rotary compressor configured as described above will be described below.

The pressure pulsation of the refrigerant caused by the compression of the refrigerant in the cylinder 7 or the vibration caused by the mechanical collision or the like vibrates each component and propagates the refrigerant or the like in the bearing 8 or the sealed case 11 to cause the sealed case. It is transmitted to 11. Therefore, the sealed case 11
Vibrates and generates noise. At that time, similarly to the conventional example, the front lid shell 11b basically has a substantially spherical shape with a relatively large curvature, so that the natural vibration mode of the front lid shell 11b deforms and vibrates in the axial direction and the direction perpendicular to the axial direction. The generation of noise can be suppressed by shifting the natural frequency of the natural vibration mode that deforms and vibrates. Also, the body shell 11a is the arm 8a of the bearing 8.
The front lid shell 11b vibrates in the radial direction with the parts as nodes and the belly between the arms 8a and 8a, but the front lid shell 11b deforms between the arms 8a of the bearing 8, that is, the radial vibration of the shell 11a. Since it has a ridgeline 11br at the relative position that is the abdomen of the
Will press the abdomen of the radial deformation vibration,
The radial deformation vibration of the body shell 11a is suppressed. Further, since the shape of the front lid shell 11b is a substantially spherical shape such as a substantially triangular shape, a damping action acts on the radial deformation vibration, and the peak of the radial deformation vibration is crushed. Therefore, the radial deformation vibration of the body shell 11a can be suppressed to a small extent, and the noise generated thereby can be suppressed to a small extent.

EFFECTS OF THE INVENTION As described above, the present invention relates to a rotary compressor in which an electric compression element is directly fixed and housed in a sealed case, and a bearing having a plurality of arms radially fixed in the sealed case is provided. At least one of the cup-shaped lid shells of the closed case has a substantially spherical shape, and a plurality of lid shells are located between the arms of the bearing from the substantially central position of the lid shell toward the opening of the lid shell. By extending the rounded ridgeline with a relatively small curvature and connecting each ridgeline with a substantially curved surface with a relatively larger curvature than the radius of the ridgeline, it is possible to deform and vibrate in the axial direction of the lid part. It is possible to shift the natural frequency of the vibration mode and the natural vibration mode that deforms and vibrates in the direction orthogonal to the axial direction, and suppress the deformation vibration in the radial direction.
The generation of noise caused by the deformation vibration of the closed case can be suppressed to be small, and effective noise reduction can be achieved.

[Brief description of drawings]

FIG. 1 is a perspective view of a front lid shell of a rotary compressor showing an embodiment of the present invention, FIG. 2 is a front view of the compressor, FIG. 3 is a sectional view of the compressor, and FIG. [Fig. 4] is a cross-sectional view of a conventional rotary compressor. 8 ... Bearing, 8a ... Arm, 11 ... Closed case, 11b ... Front lid shell, 11c ... Rear lid shell, 11br ... Ridge line, 11b
h ... substantially curved surface.

Claims (1)

[Claims] 1. A cup-shaped lid shell for a hermetically sealed case, comprising: a hermetically sealed case in which an electric compression element is directly fixedly housed; and a bearing fixed to the hermetically sealed case, the bearing having a plurality of radially extending arms. At least one of them has a substantially spherical shape, and has a plurality of relatively small curvatures, which are located between the arms of the bearing and extend from the substantially central position of the lid shell toward the opening of the lid shell. A rotary compressor in which the ridge lines are extended and each ridge line is connected by a substantially curved surface having a relatively large curvature compared to the radius of the ridge line.