JPS5968591A - Enclosed rotary compressor - Google Patents

Abstract

PURPOSE:To improve the operational efficiency extending the life of the titled compressor by a method wherein an anti-vibration ring adheres to the periphery of a sealed container to prevent the resonance property at specified frequency from being displayed in the closed container resticting the vibration and noise sounding as well as dissipating the heat generated in case of operating a compressor. CONSTITUTION:An anti-vibration ring 4 is fixed to the periphery of a closed container 3 by pressed shrinkage fit so that the size of a seat 4a may be sufficient to encircle the entire or at least a part of cylinder block 6. Through these procedures, when external force F is exerted, a cmpression and a tension interfere with each other at the interface between the closed container 3 and the anti-vibration ring 4 finally to eliminate a neutral surface of definite force on the section of the closed container 3. Resultantly no resonance property at specified frequency may be displayed, diminishing the vibration of the closed containner 3, reducing the vibration and noise in a compressor as well as conducting the heat generated by the compressor to the anti-vibration ring 4 through the closed container 3 to dissipate the heat into the atmosphere.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a compressor that simultaneously realizes a soundproof structure for reducing the noise of a rotary hermetic compressor and a heat dissipation mechanism for heat generated by the compressor.

Conventional Structure and Problems Conventionally, the hermetic container of a rotary hermetic compressor has been constructed by combining cold-rolled steel pipes or pressed plates.

However, since the hermetic container made of a single plate exhibits unique sharp resonance characteristics, vibrations generated from the rotary complete compression mechanism element disposed inside the hermetic container are transmitted to the compression mechanism element and the hermetic container. The hermetic container resonated at the peak of the resonant frequency unique to the hermetic container, and the compressor generated loud noise.

The conventional noise reduction method for this resonance of a closed container is to make the shape of the closed container closer to a spherical shape.
There are some that are designed to suppress the resonance of the sealed container as much as possible, and others that have a damping mechanism attached to the inner wall of the sealed container.These methods suppress the vibration of the sealed container and reduce the noise of the compressor. things are known. However, when the shape of the airtight container is changed, the space inside the airtight container is restricted, resulting in various inconveniences in the shape design of the compressor. However, there were problems such as the fact that the noise reduction effect was still insufficient.

Furthermore, the principle of generation of vibration and noise due to the closed container in a conventional rotary hermetic compressor will be explained in detail with reference to FIGS. 1 and 2.

FIG. 1 shows a cross-sectional shape, and (1) shows a closed container.

This closed container (1) is made of a single homogeneous material. Therefore, the sealed container (1) is deformed as shown by the broken line (2) due to the external force F generated from the rotary compressor element (not shown) that is supported in direct contact with the inner surface of the sealed container (1). . Here, the broken line (2) schematically represents an example of a mode of deformation when the closed container (1) receives an external force F. At this time, if external force F acts at 8 points, a, c
A tensile force acts on the outer wall surface at point 0 and the inner wall surface at points bld and f, and a compressive force acts on the wall surface opposite each point. To explain this situation in more detail, Figure 2 shows the first
This is an enlarged view of point a in the figure, where the external force F is applied to the closed container (
When the external force F acts on the inner wall surface of No. 11, a compressive force acts at a point P of application of the external force F, and a tensile force acts at a point q, which is the position of point P on the outer wall surface. However, there exists a force neutral plane 0o/ where the tensile force and the compressive force cancel each other out and no force acts on either, and this always exists in a closed container made of a single, homogeneous material. However, since the external force F is a quantity that fluctuates irregularly over time, when the aforementioned neutral plane exists in the closed container, the closed container exhibits extremely clear resonance characteristics.
There is a drawback that the external force F rides on this resonant frequency and is amplified, causing vibration and noise to be generated from the closed container.

Purpose of the Invention The present invention eliminates the above-mentioned neutral plane, suppresses the resonance characteristics of the closed container, suppresses the generation of vibration and noise, and improves operating efficiency by dissipating the heat generated during compressor operation. , to extend the life of the compressor.

Structure of the Present Invention The present invention provides a rotary hermetic compressor in which an electric motor and a cylinder block of a rotary compressor element driven by the electric motor element are fixedly supported in an airtight container for the compressor, in which the cylinder block is fixed. The present invention is characterized in that a vibration isolating ring made of an alloy having vibration damping ability is provided to cover the entire circumference of a common portion at a position facing the cylinder block on the outside of the airtight container for the compressor.

Description of examples The present invention will be explained based on the drawings.

FIG. 3 is a partially cutaway sectional view of the rotary hermetic compressor of the present invention, and FIG. 4 is an enlarged sectional view taken along line IV--IV in FIG. 3.

In the figure, (3) is a hermetic container forming the outer shell of the rotary hermetic compressor, and its horizontal cross section is circular. (4) is a vibration isolating ring that is tightly fixed to the closed container (3) for thermal conduction, and includes an annular pedestal (4a) that is in close contact with the closed container (3), and a cross-sectional shape extending outward from this pedestal. It consists of a trapezoidal protrusion (4b). (5) is a closed container (
3) The stator of the electric motor housed in the container (3), whose outer periphery is in close contact with the inner surface of the closed container (3) and fixedly supported by welding. (6) is a cylinder block that is driven by the electric motor and forms a part of a normal rotary compressor element that compresses refrigerant, and is tightly supported by welding on the inner surface of the closed container (3). has been done. Anti-vibration ring (4)
is fixed to the outer periphery of the closed container (3) by shrink-fitting with a size that surrounds the base portion (4a) or the cylinder block (6) in its entirety or at least a common part thereof.

Next, the relationship between the closed container (3) and the vibration isolation ring (4) of the present invention will be explained with reference to FIG. 4. Now, airtight container (3)
When an external force F acts on the inner wall surface from the inside of the airtight container (3),
is the point of application of the external force F, and a compressive force is generated on the inner wall surface or a tensile force is generated on the outer wall surface. Similarly, compressive force is generated on the inner wall side of the pedestal portion (4a) of the vibration isolating ring (4), and tensile force is generated on the outer wall side. However, since the vibration isolating ring (4) is installed in the closed container (3) by shrink fitting,
When the external force F acts, the compressive force and the tensile force interfere with each other at the interface between the two, and as a result, there is no clear neutral force plane in the cross section of the closed container (3), and the first Figure dashed line (2
) will not be deformed as shown. Therefore, the anti-vibration ring (
4) does not exhibit clear resonance characteristics at a specific frequency, and the vibrational energy due to the relative motion between the two is converted into thermal energy at the interface.
The vibrations of the closed container (3) are attenuated, and as a result, the vibrations and noise of the rotary compressor are reduced.

When the rotary compressor configured as described above is operated, vibrations generated in the rotary compressor element are transmitted from the cylinder block (6) to the closed container (3), but the vibration isolating ring (4) Due to the laminated structure consisting of the sealed container (3) and the sealed container (3), the sealed container (3) no longer exhibits resonance characteristics at a specific frequency, so it does not resonate, and furthermore, the vibration energy is converted into thermal energy by friction. Vibrations are further reduced.

Moreover, the heat generated from the compression mechanism element is transferred to the closed container (
3) to the vibration isolating ring (4), and is radiated into the atmosphere together with the aforementioned frictional heat by the protrusion (4b) of the vibration isolating ring (4).

The material of the vibration isolating ring (4) can be any metal as long as it has good thermal conductivity, but the material of the sealed container (3)
If the material is different from that of the material, the neutral plane of force will be less likely to exist, and even better results will be obtained.

Furthermore, in order to prevent the vibration isolating ring (4) from having resonance characteristics, the material is made of a vibration isolating alloy such as a nickel titanium alloy that has a very large vibration damping ability, thereby achieving even better vibration damping and soundproofing effects. is obtained.

Effects of the Invention As is clear from the embodiments described above, the hermetic rotary compressor according to the present invention has a stator of an electric motor element and a rotary compressor element driven by the electric motor element on the inner wall surface of the hermetic container. A cylinder block is fixedly supported, and a vibration isolating ring that covers the entire cylinder block or a small portion thereof is tightly fixed to the outer periphery of the closed container,
In addition to preventing the occurrence of resonance characteristics in a sealed container at a specific frequency, it can also damp vibrations generated by the compressor and dissipate heat generated from inside the compressor, thereby increasing the efficiency of the compressor. It has the effect of increasing the lifespan.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of the hermetic container of a conventional rotary hermetic compressor, Figure 2 is a partially enlarged sectional view of the hermetic container, and Figure 3
The figure shows a partially cutaway sectional view of a rotary hermetic compressor according to an embodiment of the present invention, and FIG. 4 shows an enlarged sectional view taken along the line 2-IV shown in FIG. 3. 3: Airtight container 4: Anti-vibration ring 5: Stator 6: Cylinder block Patent applicant Matsushita Electric Industrial Co., Ltd. Representative patent attorney
Isao Abe Figure 1 ``Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] In a rotary one-piece hermetic compressor in which an electric motor and a cylinder block of a rotary one-piece compressor element driven by the electric motor element are fixedly supported in a hermetically sealed container for the compressor, the above-mentioned rotary one outside the compressor container to which the cylinder block is fixed is provided. A rotary hermetic compressor equipped with a vibration-isolating ring made of an alloy with vibration damping ability that covers the entire circumference of a small common area facing the cylinder block.