JPS61187588A - Noise damper of enclosed rotary compressor - Google Patents

Abstract

PURPOSE:To prevent vibrations of an intake pipe and reduce noises of a rotary compressor by winding a coil-like metal wire in close contact with the outer periphery of the intake pipe extending into an intake accumulator. CONSTITUTION:An intake accumulator 6 is fitted to the outside of an enclosed container 3 near the intake port 4 of a rotary compressor, and a straight pipe 9 communicated to a bent pipe 5 connected to the intake port 4 of the compressor is extended into this accumulator 6. A coil-like metal wire 12 is wound in close contact with the outer periphery of this straight pipe 9 so as to damp vertical vibrations of the straight pipe 9. Accordingly, noises of the rotary compressor can be effectively reduced.

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 Conventionally, this type of hermetic rotary compressor, as shown in FIG. 4 was connected to an accumulator 6 via a bent pipe 5 or the like, and the accumulator 6 was connected to an accumulator mounting base 8 of the closed 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. Bent pipe 5 connected to section 4
, a vibration system consisting of the accumulator 6 and a straight pipe 9 extending into the inside of the accumulator 6 causes resonance in the straight pipe 9 in a direction perpendicular to the axis, and generates abnormal noise at a specific frequency. was there.

In order to prevent this, conventional methods have been used to improve the rigidity of the vibration system by changing the material and design dimensions of the straight pipe 9, and by pasting a damping material 11 or the like on the side wall 1o of the accumulator 6. The vibration system is designed to make it difficult for the vibration system to radiate abnormal noise by adjusting the There are cases where these cannot be easily adjusted due to manufacturing, manufacturing, or cost issues, which is a problem.

OBJECTS OF THE INVENTION The present invention has been made in view of the above-mentioned drawbacks of the prior art, and an object thereof 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 hermetically sealed container. An accumulator is disposed outside the airtight container, and a bent pipe is provided to connect the inlet of the compression element and the inside of the accumulator,
This curved tube extends into the accumulator, and a coiled metal wire is tightly wound around part or the entire outer circumference of the curved tube.

DESCRIPTION OF EMBODIMENTS The present invention will now be described with reference to FIG. 2 of the accompanying drawings, which shows 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; An accumulator mounting stand 8 welded to the outer periphery of the airtight container 3 is fixed via a hair accumulator mounting metal fitting 7. Reference numeral 9 denotes a straight pipe part whose one end is connected to the bent pipe 5 and the other end extends into the inside of the accumulator 6, and a coiled metal wire 12 is tightly wound around the outer circumference of the straight pipe part.

In the above configuration, the nominal output is from 500 watts to 150 watts.
A 0 watt hermetic rotary compressor is used, and an accumulator 6 made of steel with an outer diameter of about 50 mm and a plate thickness of about 0.8 mm is used, and the straight pipe section 9 is removed. The material is a steel pipe with a diameter of about 14 mm and a plate thickness of about 1 mm, and a metal wire coiled around the outer periphery of the straight pipe section 9 is made of a metal wire with an outer diameter of about 0.0 mm.
As a result of an experiment on the vibration response characteristics of the vibration system using piano wire with a length of 5 mm and a coiled length of approximately 150 mm, characteristics as shown in FIG. 3 were obtained.

This is a closed container 3 containing a compression element 1 and an electric element 2.
, when the vicinity of the suction port 4 of the compression element 1 is vibrated in a radial direction perpendicular to the axis of the closed container 3, the vibration response characteristics of the accumulator side wall in the same direction as the vibration direction are shown. 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 approximately 800 Hz to 51,800 Hz and the frequency range from 2,200 Hz to approximately 3,500 Hz corresponds to the hermetic rotation that occurs when a hermetic rotary compressor is operated at 50 Hz and 60 Hz, the power frequency. This is a particularly large frequency range of high frequency components of 500 Hz or more of the excitation force of the compressor, and is a frequency range that is considered important as a noise characteristic.

However, as is clear from FIG. 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 tightly wound around the straight pipe portion in the accumulator. Also, 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 compression element 1 and the electric element 2
In a vibration system consisting of a closed container 3 containing a compressor, a curved pipe 5 connected to the suction port 4 of the compression element 1, an accumulator side wall, and a straight pipe part 9 extending into the inside of the accumulator 6,
By closely winding a coiled metal wire around the outer circumference of the straight pipe section 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 damping device for a hermetic rotary compressor according to the present invention comprises a hermetic rotary compressor with a compression element and an electric element built into a hermetic container, and an inlet of the compression element. An accumulator is disposed outside the sealed container in close proximity to the compressor, a curved pipe is provided to connect the inlet of the compression element to the inside of the accumulator, the curved pipe extends into the accumulator, and the outer periphery of the curved pipe is A coiled metal wire is wound around the compressor element, which improves the vibration response characteristics in the direction perpendicular to the axis of the vibration system consisting of the straight pipe extending from the inlet of the compression element into the accumulator and the accumulator. As a result, a quieter compression effect can be obtained, and since it is built into the accumulator, the accumulator part does not need to be enlarged, and the structure is extremely simple, resulting in excellent effects.

[Brief explanation of the drawing]

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 between the present embodiment and the conventional example, and FIG. 4 is a comparative characteristic diagram of the noise of the hermetic rotary compressor between the present embodiment and the conventional example. 1...Compression element, 2...Electric element, 3
... airtight container, 5 ... bent pipe, 6 ...
...Accumulator, 9...Straight pipe section, 12...
...Metal wire. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 3 Hakugan (u/hl) Figure 4 Tsukasa Lingso (H2)

Claims (1)

[Claims] A hermetic rotary compressor is constructed by incorporating a compression element and an electric element inside a hermetic container, an accumulator is disposed outside the hermetic container near the suction port of the compression element, and A closed type rotary device in which a bent pipe is provided to connect the intake port and the inside of the accumulator, this bent pipe is extended into the accumulator, and a coiled metal wire is tightly wound around part or the entire outer circumference of the bent pipe. Compressor noise attenuation device.