JPS6411832B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a noise damping device for a hermetic rotary compressor equipped with an accumulator or the like in an air conditioner, etc., and aims to improve the noise characteristics of the hermetic rotary compressor. This is the purpose.

Conventionally, this type of hermetic rotary compressor, as shown in FIG. The structure was such that the accumulator f was connected to the accumulator mounting base h of the airtight container c using the attachment fitting g for the accumulator f.

In such a conventional hermetic rotary compressor, vibration components generated from the compression element a and the electric element b cause the airtight container c containing the compression element a and the electric element b, and the suction of the compression element a. A vibration system consisting of a curved pipe part e connected to the port part d, the above-mentioned accumulator f, and a right-angled part i extending into the inside of the accumulator f is connected to the straight pipe part i.
causes resonance in the direction perpendicular to the axis,
There was a problem where abnormal noise was generated at a specific frequency.

In order to prevent this, conventionally, the rigidity of the vibration system has been improved by changing the material and design dimensions of the straight pipe part i, and by pasting a damping material k or the like on the side wall part j of the accumulator f. The vibration system is designed to prevent resonance in a specific frequency range by adjusting the vibration system and making it difficult for the vibration system to radiate abnormal noise, but the performance of the compressor There are cases where these cannot be easily adjusted due to manufacturing, manufacturing, or cost issues, which has been a problem.

The present invention has been made in view of the above-mentioned conventional drawbacks, and includes a closed container containing a compression element and an electric element, a bent pipe section connected to a suction port section of the compression element, an accumulator, and a straight pipe extending into the inside of the accumulator. In a vibration system consisting of a straight pipe section, resonance in a direction perpendicular to the axis of the straight pipe section is kept away from a specific frequency range, thereby improving noise characteristics.

As a configuration for this purpose, the present invention configures a hermetic rotary compressor by incorporating a compression element and an electric element inside a hermetic container, and an accumulator is provided outside of the hermetic container near the suction port of the compression element. arranged,
A bent pipe is provided that connects the suction port of the compression element to the inside of the accumulator, the bent pipe is extended into the accumulator to provide a straight pipe part, and a constriction part extending all around the straight pipe part is provided at one or more places of the straight pipe part. It has been established.

Hereinafter, the present invention will be explained with reference to FIG. 2 of the accompanying drawings showing one embodiment thereof.

In FIG. 2, reference numeral 1 denotes a closed container, which houses a compression element 2 and an electric element 3 having a well-known structure. 4 is a bent pipe connected to the compression element 2; 5 is an accumulator having a well-known configuration; the inside of the accumulator 5 is connected to the suction port 2a of the compression element 2 via the bent pipe 4; It is fixed via an accumulator attachment fitting 7 to an accumulator attachment stand 6 which is welded to the outer periphery of the container 1 . Reference numeral 8 denotes a straight pipe part whose one end is connected to the bent pipe 4 and whose other end extends into the inside of the accumulator 5. A constricted part 9 extending all around the circumference is formed in the center of the straight pipe part 8. The part has a small diameter. Note that this straight pipe portion 8 may be formed integrally with the bent pipe 4, if necessary.

In the above configuration, the nominal output starts from 500 watts.
A 1500 watt hermetic rotary compressor is used, and an accumulator 5 made of copper with an outer diameter of about 50 mm and a plate thickness of about 0.8 mm is used. mm, the plate thickness is about 1 mm, the material is a copper tube, and the straight pipe section 8 is formed with a constricted section 9 having a diameter T of about 8 mm and a width 1 of about 5 mm approximately in the center. As a result of experiments on the vibration response characteristics of the vibration system, characteristics as shown by the solid line in FIG. 3 were obtained. This is the vibration direction when the airtight container 1 containing the compression element 2 and the electric element 3 is vibrated in the radial direction perpendicular to the axis of the airtight container 1 near the suction port 2a of the compression element 2. This is the vibration response characteristic of the side wall of the accumulator in the same direction as . Here, the broken line shows the conventional example, and the vertical axis shows the vibration response level (acceleration/
force) and the frequency is plotted on the horizontal axis.

In this vibration response characteristic, from 800Hz to 1800Hz
For frequency ranges up to 2200Hz and 3500Hz, hermetic rotary compressors are used at 50Hz and 3500Hz.
This is a particularly large frequency range of high-frequency components of 500Hz or more of the excitation force of a hermetic rotary compressor that is generated when operating at a power supply frequency of 60Hz, and is a frequency range that is considered important for noise characteristics.

However, as is clear from FIG. 3, in this embodiment, the vibration response level is generally lowered in the above frequency band, and moreover, the resonance of the vibration system is largely shifted to other frequency ranges. Also the fourth
Also in the noise frequency characteristics of the hermetic compressor shown in the figure, the frequency component of 2500 Hz is greatly attenuated compared to the broken line characteristics showing the conventional example.

That is, as in this embodiment, the airtight container 1 containing the compression element 2 and the electric element 3, the compression element 2
In a vibration system consisting of a bent pipe 4 connected to the suction port 2a, an accumulator side wall, and a straight pipe part 8 extending into the inside of the accumulator 5, the straight pipe part 8
By providing the constriction part 9 in the center of the vibration system, resonance in the direction perpendicular to the axis of the vibration system can be adjusted in a specific frequency range.

Note that the number of the aperture portions 9 is not limited to one, but may be a plurality of aperture portions, and the same effect can be expected if the positions thereof are appropriately set.

The noise attenuation device for a hermetic rotary compressor according to the present invention includes a hermetic rotary compressor that includes a compression element and an electric element built in a hermetic container, and a noise damping device for a hermetic rotary compressor in which the hermetic rotary compressor is constructed by incorporating a compression element and an electric element inside a hermetic container. An accumulator is disposed outside of the accumulator, and a bent pipe is provided to connect the suction port of the compression element and the inside of the accumulator, and this bent pipe is extended into the accumulator, and furthermore, the straight pipe is completely connected to one place or a double wave part. A closed container containing the compression element and the electric element, a straight pipe extending from the inlet of the compression element into the accumulator, and perpendicular to the axis of the vibration system consisting of the accumulator. The directional vibration response characteristics have been improved, and a quieter compression effect can be obtained.Furthermore, since a straight pipe with a constricted section formed in advance can be extended into the inside of the accumulator, it is easy to assemble and has a simple structure. It is extremely simple and has excellent effects.

[Brief explanation of drawings]

FIG. 1 is a vertical cross-sectional view of a hermetic rotary compressor equipped with a noise attenuation device in a conventional example, and FIG. 2 is a vertical cross-sectional view of a hermetic rotary compressor equipped with a noise attenuation device according to an embodiment of the present invention. Figure 3 is a comparative characteristic diagram of the vibration response level between this embodiment and the conventional example.
The figure is a noise comparison characteristic diagram of the hermetic rotary compressor of this embodiment and a conventional example. 1... Airtight container, 2... Compression element, 3... Electric element, 4... Bent pipe, 5... Accumulator, 8...
... Straight pipe section, 9... Squeezed section.

Claims (1)

[Claims] 1 A hermetic rotary compressor is constructed by incorporating a compression element and an electric element inside a hermetic container, an accumulator is disposed outside of the hermetic container near the suction port of the compression element, and the compression element A bent pipe is provided to connect the intake port of the accumulator to the inside of the accumulator, and this bent pipe is extended into the accumulator to provide a straight pipe part,
A noise damping device for a hermetic rotary compressor that is provided with a constriction section that divides this straight pipe section into a plurality of sections.