JPS6316179A - Noise damping device for compressor - Google Patents

Abstract

PURPOSE:To reduce the extent of noise, by installing a bent pipe, extending as a straight pipe part, in the inner part of an accumulator, connecting one end to a suction port of a compression element and installing the other end at the outside of a hermetically sealed vessel. CONSTITUTION:The inside of an accumulator 6 is connected to a suction port 4 of a compression element 1 via a bent pipe 5. A straight pipe part 9 is connected to the bent pipe at its one end, and the other end is extended to the inside of the accumulator 6. A coil-form spring material 12 is wound on an outer circumferential part of the accumulator 6 and it being fixed there. Therefore, improvement in a vibro-responsive characteristic in a direction orthogonal with the shaft of a vibration system is well promoted.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a noise damping device for a compressor equipped with an accumulator used in an air conditioner or the like.

2. Description of the Related Art Conventionally, as shown in FIG. 4, this type of hermetic rotary compressor has a hermetic container 3 containing a compression element 1 and an electric element 2, and a bent pipe 5 connected to the suction port 4 of the compression element 1. The accumulator 6 was connected to the accumulator mounting base 8 of the closed container 3 using a metal fitting 7 to attach the accumulator 6.

Problems to be Solved by the Invention In such a conventional 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,
A vibration system consisting of a bent pipe section 5 connected to the suction port section 4 of the compression element 1, the accumulator 6, and a straight pipe section 9 extending into the inside of the accumulator 6 is configured to vibrate at right angles to the axis in the straight pipe section 9. There was a problem in that it caused resonance in the direction and generated abnormal noise and sound at specific frequencies.

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 1o of the accumulator 6. etc., or to make it difficult for the vibration system to radiate abnormal noise so that the vibration system does not resonate in a specific frequency range (
Although this design has been implemented, there is a problem in that these cannot be easily adjusted due to problems in the performance, manufacturing, or cost of the compressor.

The present invention has been made in view of the above-mentioned drawbacks of the conventional art, and it is an object of the present invention to reduce noise and vibration generated from an accumulator by extremely simple means.

Means for Solving the Problems To achieve this object, the present invention incorporates a compression element and an electric element inside a closed container, one end of which is connected to the suction port of the compression element, and the other end of which is connected to the inlet of the compression element. A curved pipe extending as a straight pipe is provided inside the accumulator provided outside the airtight container, and a coiled spring material is wound and fixed around the outer periphery of the accumulator.

Operation With the above configuration, it is possible to improve the vibration response characteristics in the direction perpendicular to the axis of the vibration system consisting of the accumulator and the straight pipe extending from the airtight container and the inlet of the compression element into the accumulator.

EXAMPLE Hereinafter, the present invention will be explained with reference to FIG. 1 of the accompanying drawings showing one example thereof.

In FIG. 1, 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 is a straight pipe portion whose one end is connected to the bent pipe 5 and the other end extends into the inside of the accumulator 6. Reference numeral 12 is a coiled spring material that is wound around the outer periphery of the accumulator 6 and fixed thereto.

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 5 made of steel with an outer diameter of about 50 mm and a plate thickness of about 0.8 mm is used, and a straight pipe section 8 is used.
is made of a steel pipe with an outer diameter of about 14 mm, a plate thickness of about 1 mm, and a coiled spring material 12 with a wire diameter of about 1 mm is wound around the outer periphery of the accumulator 6 and fixed. As a result of conducting an experiment on the vibration response characteristics of the vibration system, the characteristics shown by the solid line in FIG. 2 were obtained. This is done by connecting the vicinity of the suction port 4 of the compression element 1 to the airtight container 3 that contains the compression element 1 and the electric element 2.
This is the vibration response characteristic of the accumulator side wall in the same direction as the excitation direction when the vibration is applied in the radial direction perpendicular to the axis of . 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
For the frequency range up to about Hz, the hermetic rotary compressor can be used at 50Hz.
and 60 Hz, which is a particularly large frequency range of high frequency components of 500 Hz or more of the excitation force of the hermetic rotary compressor that is generated when operating at an electric frequency, and is a frequency range that is considered important as a noise characteristic.

However, as is clear from FIG. 2, 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 the embodiment, the airtight 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 accumulator side wall, and the straight pipe part 8 extending into the inside of the accumulator 6. In a vibration system consisting of
A coiled spring material 12 is provided on the outer periphery of the accumulator 6.
By winding and fixing the vibration system, resonance in a direction perpendicular to the axis can be adjusted in a specific frequency range.

Effects of the Invention The compressor noise attenuation device according to the present invention has a compression element and an electric element built into a sealed container, one end of which is connected to the suction port of the compression element, and the other end of which is connected to the outside of the sealed container. A bent pipe extending as a straight pipe part is provided inside the provided accumulator, and a coiled spring material is wound and fixed around the outer periphery of the accumulator, and the airtight container contains the compression element and the electric element; The vibration response characteristics in the direction perpendicular to the axis of the vibration system consisting of the accumulator and the straight pipe extending from the suction port of the compression element into the accumulator have been improved, resulting in quieter compression effects and even lower Because a coiled spring material is wrapped around the
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 longitudinal cross-sectional view showing a noise damping device for a compressor according to an embodiment of the present invention, Fig. 2 is a comparative characteristic diagram of vibration response levels between this embodiment and a conventional example, and Fig. 3 is a comparison characteristic diagram of the vibration response level of this embodiment and a conventional example. FIG. 4 is a longitudinal sectional view showing a noise damping device for a conventional compressor. 1... Compression element, 2... Electric element, 3...
... airtight container, 5 ... bent pipe, 6 ... accumulator, 9 ... straight pipe section, 12 ... coiled spring material. Name of agent: Patent attorney Toshio Nakao and 1 other person1-
-Ichihiki Basho Deception 5--Ikunori Tube 6--Ayayumuratano 2--Coil: Medical Spring Main O Figure 2 (d8) Kurokoro (KHz) Figure 3 Fan Selection a (Hy-)

Claims (1)

[Claims] A compression element and an electric element are built into the airtight container, one end of which is connected to the inlet of the compression element, and the other end of which extends as a straight pipe into an accumulator provided outside of the airtight container. A noise damping device for a compressor, in which a pipe is provided, and a coiled spring material is wound and fixed around the outer periphery of the accumulator.