JPS5898679A - Noise damping device for enclosed type rotary compressor - Google Patents

Abstract

PURPOSE:To keep a resonance in the vertical directions with respect to an axis away from a specified frequency range and improve the property of the compressor against noise by a method wherein a metallic body is attached to a straight tube extending into an accumulator, in the device in which the accumulator is attached to an enclosed vessel. CONSTITUTION:The accumulator 5 is attached to the outer periphery of the enclosed vessel 1 and the straight tube 8, connected to the suction port 2a of a compression element 2, is extended into the accumulator 5. A cylindrical metallic body is provided at the tip end of the straight tube 8 by a proper means such as force fitting or the like. According to this method, the resonance of the straight tube 8 in the vertical directions with respect to the axis thereof may be adjusted in the specified frequency range and the property of the compressor against noise may be improved.

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 is as shown in Figure 1.
An accumulator f is connected to the suction port d of the compression element a through a bent pipe e, etc. to a closed container C containing a compression element a and an electric element, and the accumulator f is mounted using a fitting q. The structure was such that the accumulator f was connected to the accumulator mounting base of the closed container C using the above-described structure.

In such a conventional hermetic rotary compressor, vibration components generated from the compression element a and the electric element cause the airtight container C1 containing the compression element a and the electric element a to be damaged by the suction port of the compression element a. Bent pipe section e connected to section d, the accumulator f and accumulator f
There was a problem in that the vibration system consisting of the straight pipe part i extending into the inside of the pipe resonated in the direction perpendicular to the axis (in the straight pipe part i), and abnormal noise was generated at a specific frequency.

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

The present invention has been made in view of the above-mentioned drawbacks of the conventional art, and provides a closed container incorporating a compression element and an electric element.

In a vibration system consisting of a bent pipe part connected to a suction port part of a compression element, an accumulator, and a straight pipe part extending into the inside of the accumulator, the part extending into the accumulator which is one element constituting the bent pipe and the accumulator. By attaching a metal body to the straight pipe section, the resonance in the direction perpendicular to the axis is kept away from a specific frequency range, and the noise characteristics are improved. A hermetic rotary compressor is constructed by incorporating a compression element and an electric element,
An accumulator is disposed outside the sealed container 11t adjacent to the suction port of the compression element, and a straight pipe is provided to connect the suction port of the compression element and the inside of the accumulator, and the straight pipe is inserted into the accumulator. A cylindrical metal body is attached to the outer periphery of this straight pipe.

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 curved pipe connected to the compression element 2; 6 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 curved pipe 4; Accumulator mounting stand 6 Hair accumulator mounting bracket 7 welded to the outer periphery of the sealed container 1
8 is a straight pipe part whose one end is connected to the bent pipe 4 and the other end extends into the inside of the accumulator 6, and a cylindrical metal body is press-fitted or welded to the tip of the straight pipe part 8. It is provided by appropriate means such as. In addition, this straight pipe part 8 and the said curved pipe 4 may be integrated as needed.

In the above configuration, the nominal output is 500 watts to 15 o
A hermetic rotary compressor of O Watt is used, and an accumulator 6 made of steel with an outer diameter of approximately 50 mm and a plate thickness of approximately 0.8 mm and a straight pipe section 8 is used. The material is a steel pipe with an outer diameter of about 14 mm and a plate thickness of about 1 mm, and the metal body 9 to be attached to the straight pipe section 8 is a steel material with an outer diameter of about 15 mm and a height of about 5 mm. As a result of an experiment on the vibration response characteristics of the vibration system using a copper alloy material, characteristics as shown by the solid line in FIG. 3 were obtained.

This is a closed container 1 containing a compression element 2 and an electric element 3.
2 shows the vibration response characteristics of the accumulator side wall in the same direction as the vibration direction when the vicinity of the suction port 2a of the compression element 2 is vibrated in a radial direction perpendicular to the axis of the closed container 1.

Here, the broken line indicates the conventional example, with the vertical axis representing the vibration response level (acceleration/force) and the horizontal axis representing the frequency. In this vibration response characteristic, the frequency range from 800 Hz to 1800 Hz and the frequency range from 2200 Hz to 3500 Hz are compared to 50 Hz and 6
0H7, a high frequency component of 500 Hz or more of the excitation force of the hermetic rotary compressor generated when operating at an electric frequency, is a particularly large frequency range, and is a frequency range that is considered important as a noise characteristic.

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 has largely moved to other frequency ranges. Even in the noise frequency characteristic of the hermetic compressor shown in FIG. 4, the frequency component of 2500 Hz is greatly attenuated compared to the broken line characteristic showing the conventional example.

That is, as in the embodiment, the closed container 1 containing the compression element 2 and the electric element 3, the bent pipe 4 connected to the suction port 2a of the compression element 2, the accumulator side wall, and the straight pipe part 8 extending into the inside of the accumulator 6. By attaching a metal body 9 to the straight tube section 8, resonance in a direction perpendicular to the axis of the vibration system can be adjusted in a specific frequency range.

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 compression element, a straight pipe is provided that connects the inlet of the compression element and the inside of the accumulator, the straight pipe extends into the accumulator, and a cylindrical metal body is attached to the outer periphery of the straight pipe. A vibration response characteristic in a direction perpendicular to the axis of a vibration system consisting of an airtight container containing the compression element and electric element, a straight pipe extending from the inlet of the compression element into the accumulator, and the accumulator. , and a quieter compression effect is achieved.
Moreover, since the accumulator has a built-in metal body, the accumulator part does not become large in size, and the structure is extremely simple, resulting in 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. FIG. 3 is a comparative characteristic diagram of the vibration response level of the present embodiment, the conventional example, and the conventional example, and FIG. 4 is a comparative characteristic diagram of the noise of the hermetic rotary compressor of the present embodiment and the conventional example. 1... Airtight container, 2... Compression element, 3
...Electric element, 4...Bent pipe, 6...
...Accumulator, 8...Straight pipe section, 9...
...Metal body. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 3
Figure M ji庚fl tysz) Figure 4

Claims (1)

[Claims] A hermetic rotary compressor is constructed by incorporating a compression element and an electric element inside a hermetic container, and an accumulator is disposed outside the hermetic container in close proximity to the suction port of the compression element. A noise damping device for a hermetic rotary compressor, which includes a straight pipe connecting an inlet and the inside of an accumulator, this straight pipe extending into the accumulator, and a cylindrical metal body attached to the outer periphery of the straight pipe.