JPH0129993B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a hermetically sealed enclosure for a motor-compressor unit, particularly for reducing the noise generated by the motor-compressor unit and transmitted to the outside through the enclosure. This relates to a container designed to have a special shape.

The worst condition is when the natural vibrational frequency of the container is equal to or close to the vibrational frequency of the motor-compressor unit or its harmonics, since noise amplification occurs. Therefore,
The main considerations when designing a motor compressor unit are to install a silencer in the suction and exhaust pipes, to mechanically balance the rotating mass, and to mix lubricating oil to reduce noise generation. It is clear that by suspending the compressor unit within the container by means of a spring, the noise at the noise source (i.e., the motor-compressor unit itself) is reduced.

Previous theoretical and practical studies have been conducted to reduce noise in motor compressor units. As a result of these studies, it has been proposed that the container should have a spherical or elliptical or oval or other similar shape.
In other words, containers with these shapes and structures are different from the traditional cylindrical containers (with both upper and lower ends slightly curved) used in normal motor compressor units. It has been confirmed that it has a natural vibration frequency that is very different from the vibration frequency of .

Recently, it has been proposed to make the structure of the container asymmetric both in its cross-section and in its longitudinal section in order to achieve noise reduction.

The object of the invention is to make the construction of the motor-compressor unit vessel special on the basis of the technical features achieved heretofore and other original features.

The present invention relates to a container for a hermetically sealed motor-compressor unit used in a cooling device, the container comprising a lower part and an upper part welded together. comprising a wall asymmetrical in the horizontal and vertical directions and a recess in the shape of a spherical cup located at the top of the upper part, the line of intersection of the recess and the wall of the upper part; The center of the circle formed by the above-mentioned upper part and the center of the ellipse at the bottom of the upper part are arranged eccentrically with respect to the long axis of the ellipse.

The invention will be explained with reference to the drawings.

The container 10 shown in the drawings comprises a lower part 12 and an upper part 14, which parts are welded together along a line 16.

Bracket 1 welded to the lower part of the container 10
8 is provided for fixing the container to the housing of the application device.

According to the invention, consideration is given to the overall dimensions of the motor-compressor unit housed within the container 10 and the shape that maximizes the rigidity of the container in relation to the vibration characteristics produced by the motor-compressor unit. Then, the shape of this container is optimally designed. When using a vertical motor-compressor unit with the compressor located at the bottom, a spherical part with a large curvature is provided at the bottom of the lower part of the container (first
(Fig.), this spherical shaped part is made to continue to the top of the lower part so as to be asymmetrical about the longitudinal axis.

This asymmetry about the longitudinal axis is enhanced by providing a longitudinal straight section 20 at a position corresponding to an electrical connector box 23 secured to the container in a hermetically sealed electrical connection area.

In the central part, that is, the position corresponding to the stator and stator winding forming a cylindrical body, the curvature of the container is made small, and this part of the small curvature points to the center of the ellipse shown in Figure 3, which is a plan view of the container. It continues upward to a spherical cup-shaped recess 22 provided offset to the left side of the vertical axis through which it passes.

In this way, an asymmetry about the longitudinal axis is obtained in which the shape on the right in FIG. 1 is more bent than the shape on the left.

In FIG. 2 showing a side view of the container 10, the shape on the right side and the shape on the left side are symmetrical about the vertical axis, and the lower portion 12 is provided with a portion extending linearly, The upper portion 14 is provided with a curved extending portion, and the radius of curvature of this curved extending portion increases upwardly and is continuous with the recess 22 at the upper portion.

Figure 4 shows the upper part 14 of the container at 4-4 in Figure 1.
A cross-sectional view taken along a line is shown, and this cross-section shows that it has a circular shape.

The container according to the invention, which has all the above-mentioned structural features, has a motor compressor that is more compact than conventional containers in which the plate members used to construct the container are uniform in thickness and all dimensions are equal. The noise caused by the operation of the unit can be significantly attenuated.

[Brief explanation of drawings]

FIG. 1 is a front view showing an example of the container according to the present invention, FIG. 2 is a side view of the container shown in FIG. 1, FIG. 3 is a plan view of the upper part of the container shown in FIG. FIG. 2 is a cross-sectional view of the container and motor compressor unit shown in FIG. 1 taken along line 4--4 in FIG. 1; 10...container, 12...lower part of 10, 14...1
0 upper part, 18...bracket, 22...recess.

Claims (1)

[Claims] 1 Containers for motor-compressor units used in cooling devices and hermetically sealed, consisting of a lower part and an upper part welded together, in which said container has horizontal and vertical a circle comprising a wall asymmetrical in direction and a recess in the form of a spherical cup located at the top of said upper part, and formed by the line of intersection of said recess and the wall of said upper part; and the center of the ellipse at the bottom of the upper portion are arranged eccentrically with respect to the long axis of the ellipse.