JP2005113861A - Hermetic rotary compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hermetic rotary compressor of high reliability with a relatively simple construction capable of reducing an oil discharge quantity to an outside of the compressor and securing an oil quantity in an inside of a hermetically sealed container. <P>SOLUTION: The hermetic rotary compressor comprises a cylindrically-shaped shield member 26 concentric with the compressor and arranged in a space defined by an inner wall of the hermetically sealed container 1, a motor section 2 and a compression mechanism 9, a discharge port 18 of a muffler 17 arranged outside of it, a first filter in an upper part of the motor 2 for separating a refrigerant gas, and a second filter 29 inserted in a discharge pipe and separating the refrigerant gas. This allows the refrigerant gas including oil mist to be filtered by the first and second filters 23, 29 and the filtered gas is discharged outside the compressor though the discharge pipe. The oil discharge quantity to the outside of the compressor can be reduced and the sufficient oil quantity can be secured in the hermetically sealed container. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a hermetic rotary compressor, and more particularly to a hermetic rotary compressor that is used in refrigeration equipment such as an air conditioner and a refrigerator, and is particularly suitable for improving the performance of a refrigeration cycle.

  For conventional hermetic rotary compressors, a number of techniques relating to reducing the amount of oil discharged to the outside of the compressor and securing the amount of oil inside the hermetic container have been disclosed.

Among these, for example, as disclosed in Patent Document 1, as shown in FIG. 4, as shown in FIG. 4, a compression mechanism unit 106 and an electric motor unit 102 are installed inside an airtight container 101, and a rotor 103 of the electric motor unit 102 is provided. And a separation plate 108 that rotates together with the crankshaft 107 is installed between the compression mechanism 106 and the compression mechanism 106. As a result, the lubricating oil scattered in the inner space 109 between the electric motor unit 102, the compression mechanism unit 106, and the compression mechanism unit side coil end 105 of the stator 104 is separated by the separation plate 108 from the compression mechanism unit side coil end 105. It collides with the inner periphery and attempts to separate it from the refrigerant gas.
JP 9-264282 A

  However, in the conventional configuration, the oil discharge reduction amount is insufficient, or it is necessary to provide the separation plate 108 for the oil separation action as in the conventional example. Further, in any of the above conventional examples, there is no specification of a method for returning the separated lubricating oil to the lubricating oil reservoir of the sealed container, and eventually the separated lubricating oil is discharged to the outside of the sealed container together with the refrigerant gas. There was a possibility.

  This invention solves such a conventional subject, and it aims at preventing that refrigeration oil flows out into a refrigerating cycle from a compressor further than a prior art.

  In order to solve the above-described problems, the present invention separates oil from a refrigerant gas compressed in a compressor by using a filter efficiently.

  ADVANTAGE OF THE INVENTION According to this invention, the outflow of the refrigeration oil from a discharge pipe can be decreased in a sealed electric compressor.

1st invention accommodates an electric motor part and a compressor part in an airtight container, and the above-mentioned compressor part has a main bearing and a sub bearing which constitute a compression chamber in the both ends of a cylindrical cylinder and the above-mentioned cylindrical cylinder, A roller that revolves in the compression chamber, a crankshaft that is coupled to the electric motor that revolves the roller, a cylindrical inner peripheral surface of the cylinder, a cylindrical outer peripheral surface of the roller, the main bearing, and a sub-bearing; A hermetic compressor having a vane that divides the hermetically sealed space into a plurality of hermetically sealed spaces as a component, and shields the inner wall of the hermetic container between the compressor unit and the motor unit. The first shielded space, and the second shielded space formed by an upper sealed container having an upper portion of the electric motor part and a discharge pipe suction port for discharging refrigerant gas to the outside of the sealed container, The second shielding space Having a first filter for separating oil from the refrigerant gas to the upper part of the machine, in which a second filter for separating oil from the refrigerant gas to the discharge pipe.

  And according to this structure, the refrigerant gas containing the oil mist discharged from the compressor part passes through the electric motor through the first shielded space, and is then filtered by the first filter that separates the oil from the refrigerant gas. The mist that has been liquefied, and the dropped lubricating oil falls from the inner wall of the sealed container due to gravity and returns to the lubricating oil reservoir at the bottom of the sealed container. Further, the mist filtered by the second filter is liquefied at the upper part of the electric motor part, and the dropped lubricating oil falls from the inner wall of the sealed container by gravity and returns to the lubricating oil reservoir at the bottom of the sealed container.

  In the second invention, in addition to the operation of the first invention, the first shielding space is formed by a shielding member having a cylindrical shape concentric with the axial center of the compressor. According to this configuration, in addition to the operation of the invention according to claim 1, by providing the first shielding space formed by the shielding member having a cylindrical shape concentric with the axial center of the compressor, it is more reliable. Return to the lubricating oil reservoir at the bottom of the sealed container.

  A third aspect of the invention is the hermetic rotary compressor according to claim 2, wherein, in addition to the function of the first aspect of the invention, the shielding member is formed of a film having an electrical insulating property. And according to this configuration, the refrigerant gas containing the oil mist discharged from the compressor section passes through the first shielded space, and the mist filtered by the filter that separates the oil from the refrigerant gas is liquefied and dropped. The lubricating oil falls from the inner wall of the sealed container due to gravity and returns to the lubricating oil reservoir at the bottom of the sealed container.

  According to a fourth aspect of the invention, in addition to the operation of the first aspect of the invention, the shielding member is a hermetic rotary compressor according to the second aspect of the invention, wherein the shielding member is formed of a resin molded product having electrical insulation characteristics. According to this configuration, the refrigerant gas containing oil mist discharged from the compressor unit passes through the first shielded space, passes through the electric motor, and then is filtered through a filter that separates oil from the refrigerant gas. The liquefied and dropped lubricating oil falls from the inner wall of the sealed container by gravity and returns to the lubricating oil reservoir at the bottom of the sealed container.

  According to a fifth aspect of the invention, in addition to the operation of the first aspect, the first filter is a hermetic rotary compressor formed by condensing a net formed by weaving a thin wire. According to this configuration, the refrigerant gas containing the oil mist discharged from the compressor section passes through the electric motor through the first shielded space, and is then filtered by a filter that separates the oil from the refrigerant gas. The liquefied and dropped lubricating oil falls from the inner wall of the sealed container by gravity and returns to the lubricating oil reservoir at the bottom of the sealed container.

  A sixth invention is a hermetic rotary compressor in which the first filter is formed of a sintered body having an arbitrary density in addition to the first invention. According to this configuration, the refrigerant gas containing the oil mist discharged from the compressor section passes through the electric motor through the first shielded space, and is then filtered by a filter that separates the oil from the refrigerant gas. The liquefied and dropped lubricating oil falls from the inner wall of the sealed container by gravity and returns to the lubricating oil reservoir at the bottom of the sealed container.

  In a seventh invention, in addition to the first invention, a muffler provided in the compressor section in the first shielded space is provided with a muffler discharge port at a position larger than the diameter of the rotor of the motor. A hermetic rotary compressor provided at a position larger than the diameter of the shielding member.

According to an eighth aspect of the invention, in addition to the first aspect, the second filter is a hermetic rotary compressor formed by condensing a net formed by weaving thin wires. According to this configuration, the refrigerant gas containing the oil mist discharged from the compressor section passes through the electric motor through the first shielded space, and is then filtered by a filter that separates the oil from the refrigerant gas. The liquefied and dropped lubricating oil falls from the inner wall of the sealed container by gravity and returns to the lubricating oil reservoir at the bottom of the sealed container.

  A ninth invention is a hermetic rotary compressor in which, in addition to the first invention, the second filter is formed of a sintered body having an arbitrary density. And according to this configuration, the refrigerant gas containing the oil mist discharged from the compressor section passes through the electric motor through the first shielded space, and is then filtered by a filter that separates the oil from the refrigerant gas. The mist is liquefied, and the dropped lubricating oil falls from the inner wall of the sealed container by gravity and returns to the lubricating oil reservoir at the bottom of the sealed container.

  And according to this configuration, the refrigerant gas containing the oil mist discharged from the compressor section passes through the electric motor through the first shielded space, and is then filtered by a filter that separates the oil from the refrigerant gas. The mist is liquefied, and the dropped lubricating oil falls from the inner wall of the sealed container by gravity and returns to the lubricating oil reservoir at the bottom of the sealed container.

  Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1)
In FIG. 1, an electric motor unit 2 and a compression mechanism unit 9 are housed in a hermetic container 1, and the compressor unit 9 includes a cylindrical cylinder 11 and main bearings 10 constituting compression chambers at both end surfaces of the cylindrical cylinder 11. The auxiliary bearing 12, the roller 13 that revolves in the compression chamber, the crankshaft 8 that is coupled to the motor unit 2 that revolves the roller 13, the cylindrical inner peripheral surface of the cylinder 11, and the cylindrical outer peripheral surface of the roller 13 In a hermetic compressor having as a constituent element a vane 22 (not shown) that partitions a sealed space surrounded by a main bearing 10 and a sub-bearing 12 into a plurality of sealed spaces, the compressor unit 9 and the motor unit The first sealed space 24 that is shielded against the inner wall of the sealed container, the upper sealed container having the suction port of the discharge pipe 21 that discharges the refrigerant gas to the outside of the sealed container Second shielded sky formed by It has a 25, and a first filter 23 for separating oil from the refrigerant gas between the second shielded space motor 2 and the discharge pipe 21 to 25.

  The discharge pipe 21 has a second filter that separates oil from the refrigerant gas. Further, the first shielding space 24 is constituted by a shielding member 26 having a cylindrical shape concentric with the axial center of the compressor, and this shielding member is a film 27 having an electric insulation characteristic or a resin molded product (not shown). ). And in the 1st shielding space 24, in the muffler 17 provided in the compressor part 9, the discharge port 7 is provided in the position larger than the diameter of the rotor 6 of the electric motor part 2, and it is larger than the diameter of the shielding member 26. Configured in position. The first filter 23 and the second filter 29 are formed by condensing a net formed by weaving thin wires, or a sintered body having an arbitrary density.

  With the above configuration, the low-pressure refrigerant gas sucked from the suction hole (not shown) of the compression mechanism unit 9 is compressed in the cylindrical cylinder 11 to become high-pressure refrigerant gas, and is once installed in the main bearing 10. The muffler 17 is discharged. It is discharged into the first shielding space 24 from the discharge port 7 provided in the muffler 17.

  Thereafter, the refrigerant gas passes through the notch 28 of the stator 3, passes through the first filter 23 provided between the electric motor 2 and the second shielded space 25, and then passes through the second filter to be discharged. It is discharged from the pipe 21 to the outside of the compressor.

  On the other hand, a lubricating oil reservoir chamber 14 is provided at the bottom of the sealed container 1, and the lubricating oil stored therein passes through an oil hole 15 provided in the crankshaft 8 as the crankshaft 8 rotates. Then, after each sliding portion of the compression mechanism portion 9 is lubricated, it is discharged from the lubricating oil discharge hole 16 between the main bearing 10 and the crankshaft 8, and then the communication hole 20 provided on the outer periphery of the compression mechanism portion 9 is provided. Then, it returns to the lubricating oil reservoir 14 again.

With the above configuration, the refrigerant gas discharged from the compression mechanism unit 9 enters the first shielded space, then passes through the notch 28 of the stator 3 of the motor 2, and is provided between the motor 2 and the second shielded space 25. Pass through the first filter 23. At this time, the refrigerant gas becomes a gas in which the oil mist is filtered, and further passes through the second filter 29 to become a gas in which the oil mist is further filtered, and is then discharged from the discharge pipe 21 to the outside of the compressor. .

  On the other hand, the mist filtered by the first and second filters is liquefied, falls on the inner wall of the sealed container 1 by gravity, and again passes through the communication hole 20 provided on the outer periphery of the main compression mechanism 9 to again lubricate the lubricating oil. Return to reservoir 14. 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 sealed container 1.

  By the way, using a vertical single-cylinder rotary compressor with a suction volume of 36 cubic cm of the compression mechanism per revolution of the crankshaft and an inner diameter φ135 mm of the sealed container, JIS B8600-A classification conditions, power applied to the motor The amount of lubricating oil discharged to the outside of the compressor at a frequency of 50 Hz was measured. As a result, the amount of the lubricating oil with respect to the refrigerant gas was 0.5% by weight, whereas in the example of the present invention, it could be reduced to 0.1% by weight. In addition, although the said Example 1 demonstrated using the vertical installation sealed rotary compressor, the same effect can be acquired also with other types of compressors, such as a vertical installation scroll compressor, for example.

  FIG. 2 shows an example of the shape of the shielding member 26 in the present embodiment. That is, it is concentric with the shaft center of the hermetic electric compressor, has a cylindrical shape having an outer diameter slightly smaller than the inner diameter of the compression mechanism side coil end 5 of the electric motor unit 2, and is provided with the discharge hole 16 of the muffler 17 It has an outer diameter that is slightly smaller than the formed position. Here, the shielding member shown in FIG. 2 has an integral shape, but a closed space is formed as a discharge gas flow path including the lower part of the electric motor unit 2, the compression mechanism unit 9, and the sealed container 1. As long as it is a thing, it is good also as a structure which consists of two members divided, for example by the cylindrical thing and the stepped cylindrical step which fixes it. The cylindrical shielding member 26 is preferably made of an electrically insulating material because the compression mechanism side coil end 5 of the motor unit 2 is close to the material. By forming the first shielding space 24 formed by the shielding member 26, the electric motor unit 2, and the compression mechanism unit 9, the refrigerant gas containing the oil mist discharged from the muffler 17 is discharged from the first shielding space 24. The oil mist passes through the first filter 23 and enters the second shielded space 25 to become filtered gas, which is discharged from the discharge pipe 21 to the outside of the compressor through the second filter.

  FIG. 3 shows an example of the shape of the porous filter 23 in the present embodiment. The porous filter 23 has an annular shape concentric with the hermetic electric compressor, and the width thereof is between the compression mechanism side coil end of the stator 3 and the inner wall of the hermetic container 1, and the thickness is It is an arbitrary dimension lower than the coil end height on the compression mechanism side. The filter 23 is manufactured by condensing a net formed by weaving a thin wire, or a sintered alloy formed by appropriately forming a powder having a particle size.

  According to such a configuration, the refrigerant gas mixed with oil mist is filtered, and the filtered gas passes through the discharge pipe from the second shielding space and is discharged to the outside of the compressor. Therefore, it is possible to reduce the outflow of refrigerating machine oil from the discharge pipe, reduce the amount of refrigerating machine oil adhering to the pipe inner wall of the associated refrigerating cycle, and achieve a significant improvement in heat exchange performance. .

FIG. 4 shows an example of the shape of the porous filter 29 in the present embodiment. The porous filter 29 has a cylindrical shape concentric with the discharge pipe of the hermetic electric compressor, and the discharge pipe is inserted into the center thereof. The second filter 29 is a thin wire
Made by condensing a mesh formed by weaving, or a sintered alloy or the like obtained by forming a powder having an appropriate particle size.

  According to such a configuration, the refrigerant gas mixed with oil mist is filtered, and the filtered gas is discharged from the second shielded space through the discharge pipe to the outside of the compressor. Therefore, it is possible to reduce the outflow of refrigerating machine oil from the discharge pipe, reduce the amount of refrigerating machine oil adhering to the pipe inner wall of the associated refrigerating cycle, and achieve a significant improvement in heat exchange performance. .

  As described above, the hermetic rotary compressor according to the present invention can reduce the outflow of refrigerating machine oil from the discharge pipe, and thus can be applied to uses of refrigerating equipment such as an air conditioner and a refrigerator.

1 is a side sectional view showing an example of a hermetic electric compressor according to an embodiment of the present invention. The perspective view of the shielding member which is one Embodiment of this invention The perspective view of the 1st filter which is one Embodiment of this invention The perspective view of the 2nd filter which is one Embodiment of this invention Side sectional view showing an example of a hermetic electric compressor showing the conventional example

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Airtight container 2 Electric motor part 3 Stator 6 Rotor 7 Discharge port 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 hole 20 communication hole 21 discharge pipe 22 vane 23 first filter 24 first shielding space 25 second shielding space 26 shielding member 27 film 28 notch 29 second filter
DESCRIPTION OF SYMBOLS 101 Airtight container 102 Electric motor part 103 Rotor 104 Stator 105 Compression mechanism part side coil end 106 Compression mechanism part 107 Crankshaft 108 Separator 109 Inner space

Claims (9)

An electric motor part and a compressor part are housed in a hermetic container, and the compressor part revolves in a cylindrical cylinder, a main bearing and a secondary bearing that form a compression chamber on both end faces of the cylindrical cylinder, and a revolving motion in the compression chamber. A sealed space surrounded by a rotating roller, a crankshaft coupled with the electric motor that gives a revolving motion to the roller, a cylindrical inner peripheral surface of the cylinder, a cylindrical outer peripheral surface of the roller, and the main bearing and the auxiliary bearing And a vane for partitioning into a plurality of sealed spaces as a constituent element, the first shield shielded against the inner wall of the sealed container between the compressor part and the motor part A second shielded space formed by an upper sealed container having a space, an upper portion of the electric motor section, and a discharge pipe suction port for discharging refrigerant gas to the outside of the sealed container; The top of the motor is cold It has a first filter to separate the oil from the gas, the sealed type rotary compressor having a second filter for separating oil from the refrigerant gas to the discharge pipe. The hermetic rotary compressor according to claim 1, wherein the first shielding space is formed by a shielding member having a cylindrical shape concentric with the axial center of the compressor. 3. The hermetic rotary compressor according to claim 2, wherein the shielding member is formed of a film having electrical insulation properties. The hermetic rotary compressor according to claim 3, wherein the shielding member is formed of a resin molded product having electrical insulation characteristics. 2. The hermetic rotary compressor according to claim 1, wherein the first filter is formed by condensing a mesh formed by weaving thin wires. The hermetic rotary compressor according to claim 1, wherein the first filter is formed of a sintered body having an arbitrary density. The muffler provided in the compressor section in the first shielding space is provided with a muffler discharge port at a position larger than the diameter of the rotor of the electric motor and at a position larger than the diameter of the shielding member. The hermetic rotary compressor described. 2. The hermetic rotary compressor according to claim 1, wherein the second filter is formed by condensing a net formed by weaving thin wires. The hermetic rotary compressor according to claim 1, wherein the second filter is formed of a sintered body having an arbitrary density.

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