JP2004340063A - Hermetic rotary compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hermetic rotary compressor with high reliability capable of reducing oil discharge quantity to the outside of the compressor, and securing the oil quantity inside a hermetically sealed container with a relatively simple structure. <P>SOLUTION: This hermetic rotary compressor comprises a cylindrical shield member 26 concentric with the compressor installed in a space consisting of an inner wall of the hermetically sealed container 1, a motor portion 2 and a compressor mechanism portion 9, a discharge port 18 of a muffler 17 installed in the outside of the shield member 26, and a filter 23 for separating a refrigerant gas between the motor 2 and a discharge pipe 21. Therefore, the refrigerant gas carrying oil mist is filtered by the filter 23, and the filtered gas is discharged to the outside of the compressor by the discharge pipe. Thus, the oil discharge quantity to the outside of the compressor can be reduced, and a sufficient amount of oil inside the hermetic container 1 can be secured. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a hermetic rotary compressor, and more particularly to a hermetic rotary compressor that is mainly used for air conditioning or refrigeration and is particularly suitable for improving the performance of a refrigeration cycle.
[0002]
[Prior art]
Some conventional hermetic rotary compressors include a lubricating oil separator in order to reduce the amount of oil discharged to the outside of the compressor and to secure the amount of oil inside the sealed container (for example, Patent Document 1). FIG. 4 shows a conventional hermetic rotary compressor described in Patent Document 1.
[0003]
In FIG. 4, a closed container 101 has a compression mechanism 106 and an electric motor 102 installed therein. Between the rotor 103 of the electric motor unit 102 and the compression mechanism unit 106, a separation plate 108 that rotates integrally with the crankshaft 107 is provided. As a result, the lubricating oil scattered in the inner space 109 formed by the electric motor section 102, the compression mechanism section 106, and the compression mechanism section coil end 105 of the stator 104 is separated by the separation plate 108 into the compression mechanism section coil end 105. It collides with the inner circumference and separates it from the refrigerant gas.
[0004]
[Patent Document 1]
JP-A-9-264282 (page 3, FIG. 1)
[0005]
[Problems to be solved by the invention]
However, in the above-described conventional configuration, the oil discharge reduction amount is insufficient, or it is necessary to provide the separator 108 for the oil separating action. Further, a method of returning the separated lubricating oil to the lubricating oil reservoir of the closed container is not specified, and there is a possibility that the separated lubricating oil is eventually discharged to the outside of the closed container together with the refrigerant gas.
[0006]
The present invention has been made to solve such a conventional problem, and an object of the present invention is to further prevent the refrigerating machine oil from flowing out of the compressor to the refrigeration cycle as compared with the related art.
[0007]
[Means for Solving the Problems]
In order to solve the above-mentioned conventional problems, the hermetic rotary compressor of the present invention separates oil from refrigerant gas compressed in the compressor by using a filter efficiently.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
According to the first aspect of the present invention, a first shielded space and a second shielded space are formed in the closed container by an electric motor unit stored in the closed container, and the electric motor is provided in the first shielded space. A rotary compression mechanism unit driven by the unit is disposed, a discharge pipe for discharging the compressed refrigerant gas to the outside of the closed container is opened in the second shielded space, and a first pipe is provided on an outer peripheral portion of the electric motor unit. A closed rotary compressor having a notch that communicates between the shielded space and the second shielded space, wherein a filter that separates oil from refrigerant gas is provided at an opening of the notched portion on the second shielded space side. It is a thing. According to this configuration, the refrigerant gas containing the oil mist discharged from the compression mechanism passes through the notch through the first shielding space, and is filtered by the filter that separates oil from the refrigerant gas at the outlet of the notch. The mist is liquefied, and the lubricating oil that has been dropped drops from the inner wall of the closed container by gravity and returns to the lubricating oil reservoir at the bottom of the closed container.
[0009]
According to a second aspect of the present invention, there is provided the hermetic rotary compressor according to the first aspect, wherein the first shielding space includes a shielding member having a cylindrical shape concentric with the axis of the compression mechanism. According to this configuration, in addition to the operation of the first aspect of the present invention, by providing the first shielding space formed by the shielding member having a cylindrical shape concentric with the axis of the compressor, more reliable Return to the lubricating oil reservoir at the bottom of the closed vessel.
[0010]
According to a third aspect of the present invention, there is provided the hermetic rotary compressor according to the second aspect, wherein the shielding member is formed of a film having electrical insulation properties. According to this configuration, the refrigerant gas containing the oil mist discharged from the compression mechanism passes through the notch through the first shielding space, and is filtered by the filter that separates oil from the refrigerant gas at the outlet of the notch. The mist is liquefied, and the lubricating oil that has been dropped drops from the inner wall of the closed container by gravity and returns to the lubricating oil reservoir at the bottom of the closed container.
[0011]
According to a fourth aspect of the present invention, there is provided the hermetic rotary compressor according to the second aspect, wherein the shielding member is integrally formed of a resin molded product having electrical insulation properties. According to this configuration, the refrigerant gas containing the oil mist discharged from the compression mechanism passes through the notch through the first shielding space, and is filtered by the filter that separates oil from the refrigerant gas at the outlet of the notch. The mist is liquefied, and the lubricating oil that has been dropped drops from the inner wall of the closed container by gravity and returns to the lubricating oil reservoir at the bottom of the closed container.
[0012]
According to a fifth aspect of the present invention, there is provided the hermetic rotary compressor according to the first aspect, wherein the filter is formed by condensing a net formed by weaving a fine wire. According to this configuration, the refrigerant gas containing the oil mist discharged from the compression mechanism passes through the notch through the first shielding space, and is filtered by the filter that separates oil from the refrigerant gas at the outlet of the notch. The mist is liquefied, and the lubricating oil that has been dropped drops from the inner wall of the closed container by gravity and returns to the lubricating oil reservoir at the bottom of the closed container.
[0013]
The invention according to claim 6 is the hermetic rotary compressor according to claim 1, wherein the filter is formed of a sintered body having an arbitrary density. According to this configuration, the refrigerant gas containing the oil mist discharged from the compression mechanism passes through the notch through the first shielding space, and is filtered by the filter that separates oil from the refrigerant gas at the outlet of the notch. The mist is liquefied, and the lubricating oil that has been dropped drops from the inner wall of the closed container by gravity and returns to the lubricating oil reservoir at the bottom of the closed container.
[0014]
According to a seventh aspect of the present invention, there is provided the hermetic rotary compressor according to any one of the first to fourth aspects, further comprising a muffler that covers a discharge port of the compression mechanism, wherein a radial position of the muffler discharge port is a rotation of the electric motor. It is arranged outside the child and the shielding member cylindrical portion. According to this configuration, the refrigerant gas containing the oil mist discharged from the compression mechanism passes through the notch through the first shielding space, and is filtered by the filter that separates oil from the refrigerant gas at the outlet of the notch. The mist is liquefied, and the lubricating oil that has been dropped drops from the inner wall of the closed container by gravity and returns to the lubricating oil reservoir at the bottom of the closed container.
[0015]
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0016]
(Embodiment 1)
FIG. 1 is a sectional view of a hermetic rotary compressor according to Embodiment 1 of the present invention. In FIG. 1, an airtight container 1 houses an electric motor unit 2 and a compression mechanism unit 9 therein. The compression mechanism 9 forms a closed space by the cylindrical cylinder 11 and the main bearings 10 and the sub-bearings 12 arranged on both end surfaces thereof. In the closed space, a roller 13 that revolves, a crankshaft 8 that revolves the roller 13, and an outer peripheral surface and a tip of the roller 13 that are housed in grooves that are provided in the cylinder 11 in a radial direction so as to be freely retractable. A vane 22 urged to contact the parts is disposed.
[0017]
Inside the closed container 1, a first shielding space 24 formed by the compression mechanism 9, the electric motor unit 2 and the inner wall surface of the closed container 1, and an upper portion of the motor unit 2 and an upper inner wall surface of the closed container 1 are formed. A second shielding space 25 is formed. A cutout 28 is formed in the stator 3 of the electric motor unit 2, and communicates the first shielded space 24 and the second shielded space 25. The opening of the notch 28 on the second shielded space side is covered with a filter 23, and the filter 23 is made of a material formed by condensing a net into which a small-diameter wire is woven or a perforated sintered body. .
[0018]
The main bearing 10 is provided with a discharge port (not shown) for discharging the refrigerant gas compressed by the compression mechanism, and a muffler 17 is attached to cover the discharge port. A shielding member 26 having a cylindrical portion is attached to the muffler 17 concentrically with the crankshaft 8, and a refrigerant discharge port 18 is provided outside the cylindrical portion and outside the outer diameter of the rotor 6. Is provided.
[0019]
With the above configuration, the low-pressure refrigerant gas sucked from the suction hole (not shown) of the compression mechanism 9 is compressed in the cylindrical cylinder 11 to become a high-pressure refrigerant gas, and is once installed in the main bearing 10. It is discharged into the muffler 17. The liquid is discharged into the first shielding space 24 from a discharge port 18 provided in the muffler 17. Thereafter, the refrigerant gas passes through the notch 28 of the stator 3, is guided to the second shielded space 25 via the filter 23, and is thereafter discharged from the discharge pipe 21 to the outside of the compressor.
[0020]
On the other hand, a lubricating oil storage chamber 14 is provided at the bottom of the sealed container 1. After being supplied to each sliding part and lubricating each sliding part, it is discharged from a lubricating oil discharge hole 16 between the main bearing 10 and the crankshaft 8, and then a communication hole 20 provided on the outer periphery of the compression mechanism part 9. And returns to the lubricating oil reservoir 14 again.
[0021]
With the above configuration, the refrigerant gas discharged from the compression mechanism 9 enters the first shielding space, and then passes through the cutout 28 and the filter 23. At this time, the refrigerant gas becomes a gas obtained by filtering the oil mist, and is discharged from the discharge pipe 21 to the outside of the compressor. On the other hand, the mist filtered by the filter is liquefied, falls down on the inner wall of the sealed container 1 by gravity, and returns to the lubricating oil reservoir 14 again through the communication hole 20 provided on the outer periphery of the compression mechanism 9. Therefore, the amount of oil discharged to the outside of the compressor can be reduced, and a sufficient amount of oil can be secured inside the closed casing 1.
[0022]
By the way, using a vertically installed single cylinder rotary compressor having a suction volume of 36 cubic cm of the compression mechanism per rotation of the crankshaft and an inner peripheral diameter of φ135 mm of the closed container, JISB8600-A classification conditions, power supply frequency applied to the electric motor Measured the amount of lubricating oil discharged to the outside of the compressor at 50 Hz. As a result, the amount of lubricating oil for the refrigerant gas was 0.5% by weight in the conventional hermetic rotary compressor, whereas the In the case of the rotary compressor, it could be reduced to 0.1% by weight.
[0023]
Although the first embodiment has been described using the vertical hermetic rotary compressor, the same operation and effect can be obtained with other types of compressors such as a vertical scroll compressor.
[0024]
FIG. 2 shows an example of the shape of the shielding member 26 in the present embodiment. That is, it has a cylindrical shape that is concentric with the crankshaft, has an outer diameter slightly smaller than the inner diameter of the compression mechanism side coil end 5 of the electric motor section 2, and is slightly smaller than the position where the discharge port 18 of the muffler 17 is installed. It has an outer diameter. Here, the shielding member shown in FIG. 2 has an integral shape, but a closed space is formed as a flow path of the discharge gas, which is constituted by a lower portion of the electric motor section 2, a compression mechanism section 9, and the closed casing 1. As long as the member has a cylindrical shape, for example, a structure including two members separated by a cylindrical shape and a stepped cylindrical shape for fixing the same may be employed. The material of the cylindrical shielding member 26 is preferably formed of an electrically insulating material because the compression mechanism side coil end 5 of the electric motor unit 2 is close to the material. By forming the first shielding space 24 formed by the shielding member 26, the electric motor 2 and the compression mechanism 9, the refrigerant gas containing oil mist discharged from the muffler 17 is separated from the first shielding space 24. The oil mist passes through the notch 28 and the filter 23 and enters the second shielded space 25 to become filtered gas, and is discharged from the discharge pipe 21 to the outside of the compressor.
[0025]
FIG. 3 shows an example of the shape of the porous filter 23 in the present embodiment. The porous filter 23 is arranged concentrically with the crankshaft, has an annular shape, and has a thickness such that it is between the coil end of the stator 3 on the discharge pipe 21 side and the inner wall of the closed casing 1. Is an arbitrary dimension lower than the compression mechanism side coil end height. The filter 23 is manufactured by condensing a net in which fine wires are woven, or a perforated sintered alloy formed from powder having an appropriate particle size.
[0026]
According to this configuration, the refrigerant gas mixed with the oil mist is filtered, and the filtered gas is discharged from the second shielding space to the outside of the compressor through the discharge pipe. Therefore, it is possible to reduce the flow of the refrigerating machine oil from the discharge pipe, to reduce the amount of refrigerating machine oil adhering to the inner wall of the piping of the associated refrigerating cycle, and to significantly improve the heat exchange performance. .
[0027]
【The invention's effect】
As described above, according to the present invention, it is possible to reduce the outflow of the refrigerating machine oil from the discharge pipe in the hermetic electric compressor.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view illustrating an example of a hermetic electric compressor according to an embodiment of the present invention. FIG. 2 is a perspective view of a shielding member according to an embodiment of the present invention. FIG. FIG. 4 is a cross-sectional view of a hermetic electric compressor showing a conventional example.
DESCRIPTION OF SYMBOLS 1 Closed container 2 Electric motor part 3 Stator 6 Rotor 8 Crankshaft 9 Compression mechanism part 10 Main bearing 11 Cylindrical cylinder 12 Sub bearing 13 Roller 14 Lubricating oil reservoir 15 Oil hole 16 Discharge hole 17 Muffler 18 Discharge port 20 Communication hole DESCRIPTION OF SYMBOLS 21 Discharge pipe 22 Vane 23 Filter 24 First shielding space 25 Second shielding space 26 Shielding member 28 Notch 101 Sealed container 102 Motor unit 103 Rotor 104 Stator 105 Compression mechanism side coil end 106 Compression mechanism unit 107 Crankshaft 108 Separator 109 inside space

Claims (7)

A first shielded space and a second shielded space are formed in the closed container by a motor unit housed in the closed container, and a rotary compression mechanism driven by the motor unit is provided in the first shield space. A discharge pipe for discharging the compressed refrigerant gas to the outside of the closed vessel is opened in the second shielded space, and a first shielded space and a second shielded space are provided on an outer peripheral portion of the electric motor unit. A closed rotary compressor having a notch that communicates with a closed-type rotary compressor, wherein a filter that separates oil from refrigerant gas is provided at a second shielded space-side opening of the notch. Type compressor. 2. The hermetic rotary compressor according to claim 1, wherein the first shielded space includes a shielding member having a cylindrical shape concentric with the axis of the compression mechanism. 3. The hermetic rotary compressor according to claim 2, wherein the shielding member is formed of a film having an electrical insulating property. 3. The hermetic rotary compressor according to claim 2, wherein the shielding member is integrally formed of a resin molded product having an electrical insulating property. 2. The hermetic rotary compressor according to claim 1, wherein the filter is formed by condensing a net formed by weaving a thin wire. 2. The hermetic rotary compressor according to claim 1, wherein the filter is formed of a sintered body having an arbitrary density. 5. The hermetic rotary compressor according to claim 1, further comprising a muffler that covers a discharge port of the compression mechanism, wherein a radial position of the muffler discharge port is larger than a rotor and a cylindrical member of the shielding member of the electric motor. A hermetic rotary compressor, which is disposed outside.

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