JPH045838B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a noise attenuation device for a hermetic rotary compressor equipped with an accumulator or the like in an air conditioner, etc. The purpose is to measure.

Conventional structure and problems thereof Conventionally, as shown in FIG. 1, in this type of hermetic rotary compressor, a suction port portion of the compression element 1 is placed in a closed container 3 containing a compression element 1 and an electric element 2. 4 is connected to an accumulator 6 via a bent pipe 5 or the like, and the accumulator 6 is connected to an accumulator mounting base 8 of the sealed container 3 using a mounting fitting 7 for the accumulator 6.

In such a conventional hermetic compressor, vibration components generated from the compression element 1 and the electric element 2 cause damage to the airtight container 3 containing the compression element 1 and the electric element 2, and the suction port of the compression element 1. A vibration system consisting of a bent pipe 5 connected to the section 4, the accumulator 6, and a straight pipe section 9 extending into the inside of the accumulator 6 causes resonance in the direction perpendicular to the axis in the straight pipe section 9, causing a specific vibration. There was a problem with the frequency causing abnormal noise.

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 section 9 and by pasting damping material 11 or the like on the side wall section 10 of the accumulator 6. The vibration system is designed to prevent resonance in a specific frequency range by adjusting the vibration system, etc., to make it difficult for the vibration system to radiate abnormal noise. In terms of performance and manufacturing,
Alternatively, there are cases where these cannot be easily adjusted due to cost issues, which is a problem.

OBJECTS OF THE INVENTION The present invention has been made in view of the above-mentioned conventional drawbacks, and an object of the present invention is to suppress resonance in a direction perpendicular to the axis and improve noise characteristics.

Structure of the Invention As a structure for achieving the above-mentioned object, the present invention constitutes a hermetic rotary compressor by incorporating a compression element and an electric element inside a hermetic container. An accumulator is disposed outside the airtight container, a bent pipe is provided to connect the inlet of the compression element and the inside of the accumulator, the bent pipe extends into the accumulator, and at least a portion of the inner circumference of the bent pipe is provided. A coiled metal wire that absorbs vibrations is attached closely to the top.

DESCRIPTION OF EMBODIMENTS The present invention will be described below with reference to FIG. 2 of the accompanying drawings showing one embodiment thereof.

In FIG. 2, reference numeral 3 denotes a closed container, which houses a compression element 1 and an electric element 2 having a well-known structure. 5 is a bent pipe connected to the compression element 1; 6 is an accumulator having a well-known configuration; the inside of the accumulator 6 is connected to the suction port 4 of the compression element 1 via the bent pipe 5; It is fixed via an accumulator attachment fitting 7 to an accumulator attachment stand 8 which is welded to the outer periphery of the airtight container 3 . Reference numeral 9 denotes a straight pipe portion whose one end is connected to the curved pipe 5 and whose other end extends into the inside of the accumulator 6, and a coiled metal wire 12 is tightly attached to the inner peripheral portion of the straight pipe portion.

In the above configuration, the nominal output starts from 500 watts.
A 1500 watt hermetic rotary compressor is used, and an accumulator 6 made of copper with an outer diameter of about 50 mm and a plate thickness of about 0.8 mm is used. The metal wire is made of a copper tube with a plate thickness of about 1 mm, and is wound around the outer periphery of the straight pipe section 9 in a coil shape, with an outer diameter of about 0.5 mm and a coiled length of about 150 mm. As a result of an experiment on the vibration response characteristics of the vibration system using a piano wire of approximately millimeter size, characteristics as shown in FIG. 3 were obtained.

This is the vibration when the airtight container 3 containing the compression element 1 and the electric element 2 is vibrated in the radial direction perpendicular to the axis of the airtight container 3 in the vicinity of the suction port 4 of the compression element 1. This is the vibration response characteristic of the side wall of the accumulator in the same direction as the direction. Here, the broken line indicates the conventional example, and the vertical axis represents the vibration response level (acceleration/force).
The horizontal axis shows the frequency. In this vibration response characteristic, the frequency range from about 800Hz to 1800Hz and the frequency range from about 2200Hz to about 3500Hz correspond to the stress of the hermetic rotary compressor that occurs when the hermetic rotary compressor is operated at 50Hz and 60Hz, the power frequency. This is a particularly large frequency range among the high frequency components of vibration force above 500Hz, and is a frequency range that is considered important as a noise characteristic.

However, as is clear from Figure 3,
In this embodiment, the overall vibration response level is lowered in the above frequency band due to the damping effect of the metal wire closely attached to the straight pipe section in the accumulator.
Furthermore, the noise frequency characteristics of the hermetic compressor shown in Fig. 4 are 2500% higher than the broken line characteristics of the conventional example.
The Hz frequency component is greatly attenuated.

That is, as in the embodiment, the closed container 3 containing the compression element 1 and the electric element 2, the bent pipe 5 connected to the suction port 4 of the compression element 1, the side wall of the accumulator, and the straight pipe part 9 extending into the inside of the accumulator 6.
By bringing a coiled metal wire into close contact with the outer periphery of the straight pipe portion 9, resonance in the direction perpendicular to the axis of the vibration system can be adjusted in a specific frequency range.

Effects of the Invention As described above, the noise attenuating 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 inside a hermetic container.
An accumulator is disposed outside the airtight container near the suction port of the compression element, a bent pipe is provided to connect the suction port of the compression element and the inside of the accumulator, and the bent pipe is extended into the accumulator. ,
A coiled metal wire is tightly attached to the inner periphery of this curved pipe, and vibrations occur in a direction perpendicular to the axis of the vibration system consisting of the straight pipe extending from the suction port of the compression element into the accumulator and the accumulator. The response characteristics have been improved and a quieter compression effect can be obtained. Moreover, since it is built into the accumulator, the accumulator part does not need to be large, and the structure is extremely simple. It is something that plays.

[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... Compression element, 2... Electric element, 3... Airtight container, 5... Bent pipe, 6... Accumulator, 9...
...Straight pipe section, 12...Metal wire.

Claims (1)

[Claims] 1 A hermetic rotary compressor is constructed by incorporating a compression element and an electric element inside a hermetic container, and a curved pipe connecting the inside of the accumulator is provided outside the hermetic container near the suction port of the compression element. A noise damping device for a hermetic rotary compressor, wherein the curved pipe extends into the accumulator, and a metal wire for absorbing vibrations is tightly attached to at least a portion of the inner circumference of the curved pipe.