JPS5898677A - Noise attenuating device for enclosed type rotary compressor - Google Patents

Abstract

PURPOSE:To keep resonance in vertical directions with respect to an axis away from a specified frequency range and improve a property against noise by a method wherein a choked part is provided in a straight tube extended 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 while the straight tube 8, connected to the suction port 2a of a compression element 2, is extended into the accumulator 5. The choked part 9 is formed on the whole periphery of the central part of the straight tube 8 so as to be decreased in the diameter thereof at a part by the choked part 9. According to this method, the resonance in the vertical directions with respect to the axis of the straight tube 8 may be adjusted in the specified frequency range and the property of the device 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.
The accumulator fi is connected to the airtight container C containing the compression element & and the electric element via the bent pipe 0 to the suction port d of the compression element, and the accumulator f is attached using the metal fitting g. Accumulator fi said sealed container G
The structure was connected to the accumulator mount.

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 b2 to Bent pipe section 0 connected to d, the accumulator f and the accumulator f
There was a problem in that the vibration system consisting of the right-angled section 1 extending into the inside of the tube resonated in the direction perpendicular to the wound in the straight tube section 1, generating abnormal noise at a specific frequency.

In order to prevent this, conventionally, the vibration system has been improved by changing the material and design dimensions of the straight pipe section 1, and by pasting damping material etc. on the side wall section j of the accumulator 'f. The vibration system is designed to prevent resonance in a specific frequency range by adjusting the rigidity, etc., 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 is a problem.

The present invention has been made in view of the above-mentioned drawbacks of the conventional art, and includes a closed container containing a compression element and an electric element, a curved pipe section connected to a suction port section of the compression element, an accumulator tube, and a container 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 to improve noise characteristics.

To achieve this, the present invention configures a hermetic rotary compressor by incorporating a compression element and an electric element inside a hermetic container,
An accumulator is disposed outside the closed container close to the suction port of the compression element, a straight pipe is provided that connects the suction port of the compression element and the inside of the accumulator, and the straight pipe extends into the accumulator. Furthermore, a constriction portion extending all the way around the straight pipe is provided at one or more locations of the 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 6 is connected to the suction port 2a of the compression element 2 via the curved pipe 4; An accumulator mounting stand 6 is welded to the outer periphery of the container 1 and is fixed via a hair accumulator mounting fitting 7. Reference numeral 8 denotes a straight pipe part whose one end is connected to the curved pipe 4 and whose other end extends into the inside of the accumulator 6. 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. In addition,
This straight pipe portion 8 may be formed integrally with the bent pipe 4, if necessary.

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 6 mm and a plate thickness of about 0.8 mm is used. is about 14 mm, the plate thickness is about 1 mm, and the material is a steel pipe, and this straight pipe section 8. The results of an experiment on the vibration response characteristics of the vibration system when a constriction part 9 with a diameter T of approximately 8 mm and a width 1 of approximately 6 mm was formed approximately in the center of the vibration system were as shown by the solid line in FIG. These characteristics 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. is the vibration response characteristic of the accumulator side wall in the same direction as . 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, from 800Hz to 1800H
Frequency range up to about z and from 2200Hz to 3500Hz
The frequency range up to about H2 is the hermetic rotary compressor' ((5Q
Hz and 60HzQ The high frequency component of the excitation force of the hermetic rotary compressor generated when operating at a power frequency of 600Hz or more 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. 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 this embodiment, the airtight container 1 containing the compression element 2 and the electric element 3, the compression element 2] the bent pipe 4 connected to the suction port 2a, the accumulator side wall, and the straight pipe extending into the inside of the accumulator 5. In the vibration system consisting of the section 8, by providing a constriction section 9 in the center of the straight tube section 8, 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 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 the straight pipe is further connected to one or multiple plate locations of the straight pipe. It is provided with a constriction part extending around the entire circumference, and is perpendicular to the axis of the vibration system consisting of 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 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 pre-drawn section can be extended into the accumulator, it is easy to assemble and has a simple structure. It is extremely simple and has excellent effects.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view of a hermetic one-four-turn compressor equipped with a conventional noise attenuation device, and FIG. 2 is a longitudinal sectional view of a hermetic N-four-turn compressor equipped with a noise attenuation device according to an embodiment of the present invention. A vertical cross-sectional view, FIG. 3 is a comparison characteristic diagram of the vibration response level between the present embodiment and the conventional example, and FIG. 4 is a noise comparison characteristic diagram 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, 5. River.
・Accumulator, 8... Straight pipe section, 9...
...Aperture section. Name of agent: Patent attorney Toshio Nakao Haga 1 person No. 3
Figure 5: yet Figure 4: moon) also (<Hg+

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. Noise of a hermetic rotary compressor that is provided with a straight pipe that connects the suction port and the inside of the accumulator, this straight pipe extends into the accumulator, and is further provided with a constriction part extending around the entire circumference at one or more places on the straight pipe. damping device.