JP2007247443A - Hermetic compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce discharge of excessive oil unfed to a compression mechanism and coming out though the inside of a crankshaft, to an external part of a compressor. <P>SOLUTION: This hermetic compressor lubricates respective sliding parts of the compression mechanism by oil sealed in a sealed vessel by storing the compression mechanism part and an electric motor part in the sealed vessel. An oil passage outlet is arranged in the crankshaft of a range between a bearing part and a rotor instead, by blocking up the oil passage outlet on the upper end of the crankshaft. This constitution can provide the hermetic compressor capable of easily, inexpensively and surely reducing an oil delivery quantity only by regulating the oil passage outlet of the crankshaft. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an oil discharge amount reduction of a hermetic compressor used in refrigeration equipment such as an air conditioner and a refrigerator.

  As a conventional hermetic compressor, as shown in FIG. 6, a hermetic container 1 has a compression mechanism portion 2 and an electric motor portion 3, and an oil 4 for lubricating a sliding portion of the compression mechanism portion 2 in the hermetic container 1. Is enclosed and stored in the bottom of the sealed container. After the oil 4 is supplied to the bearing portion 6 by the rotation of the crankshaft 5 directly connected to the rotor 3a of the motor portion 3, excess oil that has not been used for oiling comes out from the oil passage outlet 5a at the upper end of the crankshaft. Then, it returns to the sealed container again, but part of it becomes sprayed and is discharged to the refrigeration cycle mainly from the discharge pipe 7 together with the refrigerant gas.

  Part of the excess oil that has not been used for refueling in the above-described conventional configuration passes directly through the oil passage outlet 5a at the upper end of the crankshaft and is directly sent to the discharge pipe 7, which may increase the oil discharge amount. there were.

As a conventional technique for solving this problem, there is known a technique in which an oil separator 8 having an oil separator 8 and a path 9 for returning oil into the sealed container 1 is provided in a discharge pipe 7 as shown in FIG. Yes.
Japanese Patent Laid-Open No. 5-195975

  However, the conventional structure has a problem that the oil separator 10 having the oil separator 8 and the oil return path 9 is complicated, increases the number of mounting steps, and increases the material cost.

  An object of the present invention is to provide a hermetic compressor that reliably and inexpensively reduces the discharge amount of oil contained in the refrigerant gas compressed by the compression mechanism and discharged from the discharge pipe 7.

  The configuration of the hermetic compressor according to the present invention for solving the conventional problem is that a compression mechanism and an electric motor are housed in a hermetic container, and each slide of the compression mechanism is sealed by oil sealed in the hermetic container. A hermetic compressor for lubricating a moving part, which closes the oil passage outlet at the upper end of the crankshaft, and instead provides an oil passage outlet on the crankshaft in a range between the bearing portion and the rotor. .

  With this configuration, it is possible to provide a hermetic compressor that can simply and inexpensively and reliably reduce the oil discharge amount only by regulating the oil passage outlet of the crankshaft.

  The oil passage outlet at the upper end of the crankshaft is closed, and an oil passage outlet is provided instead on the crankshaft in the range between the bearing portion and the rotor portion.

  With this configuration, it is possible to provide a highly reliable hermetic compressor with a simple structure, which can reliably and inexpensively reduce the oil discharge amount.

  A first aspect of the present invention is a hermetic compressor in which a compression mechanism portion and an electric motor portion are housed in a hermetic container, and each sliding portion of the compression mechanism portion is lubricated by oil sealed in the hermetic container, The oil passage outlet at the upper end of the shaft is closed, and an oil passage outlet is provided in the range between the bearing portion and the rotor portion of the crankshaft instead. With this configuration, after oil is supplied to the bearing portion by rotation of the crankshaft, excess oil that has not been used for oiling is prevented from being sent directly to the discharge pipe through the oil passage outlet at the upper end of the crankshaft, The oil discharge amount can be reduced.

  In the second invention, in particular, by closing the upper end of the crankshaft of the hermetic compressor of the first invention with a bolt, excess oil that has not been used for refueling passes through the oil passage outlet at the upper end of the crankshaft, and the discharge Direct delivery to the pipe is avoided, and the amount of oil discharged can be reduced. With this configuration, the oil passage can be penetrated when creating the crankshaft, so that it is easy to avoid leaving a facet.

  According to a third aspect of the present invention, in particular, in the compressor of the first or second aspect, the oil passage outlet position installed in a range between the bearing portion and the rotor portion of the crankshaft is set to a coil height of the stator. By installing within this range, the oil coming out from the oil passage outlet hits the coil and adheres to the coil. This configuration makes it difficult for oil to mix with the refrigerant gas discharged from the compression mechanism and passing through the notch provided on the outer periphery of the stator, reducing the amount of oil discharged from the discharge pipe to the outside of the compressor. It can be done.

  According to a fourth aspect of the present invention, in particular, in the compressor of the first or second aspect, an oil passage outlet position installed in a range between the bearing portion and the rotor portion of the crankshaft is set at a lower space of the rotor. By installing in this range, the oil coming out from the oil passage outlet hits and adheres to the lower space. This configuration makes it difficult for oil to mix with the refrigerant gas discharged from the compression mechanism and passing through the notch provided on the outer periphery of the stator, reducing the amount of oil discharged from the discharge pipe to the outside of the compressor. It can be done.

  According to a fifth aspect of the present invention, in the compressor of the first or second aspect of the invention, the oil passage outlet position installed in the range between the bearing portion and the rotor portion of the crankshaft is set to the coil height of the stator. By installing in this range and further in the range of the lower space of the rotor, the oil coming out from the oil passage outlet hits the coil and the lower space and adheres. This configuration makes it difficult for oil to mix with the refrigerant gas discharged from the compression mechanism and passing through the notch provided on the outer periphery of the stator, reducing the amount of oil discharged from the discharge pipe to the outside of the compressor. It can be done.

  In a sixth aspect of the invention, in particular, in the hermetic compressor according to any one of the first to fifth aspects, when the gas to be compressed is an alternative refrigerant that does not contain chlorine (for example, an HFC refrigerant), Since the wear-resistant iron chloride layer is not formed on the surface, it is particularly necessary to secure oil in the sealed container. However, according to the present invention, the oil discharge amount can be reduced outside the sealed container, so the reliability of the sliding part can be reduced. Sex can be secured.

  In a seventh aspect of the invention, in particular, in the hermetic compressor according to any one of the first to fifth aspects, when the gas to be compressed is a natural refrigerant such as carbon dioxide, the gas discharged from the compressor is at a high pressure. It is necessary to secure oil in the sealed container because the load physical strength of the sliding portion is large, but the present invention can reduce the oil discharge amount outside the sealed container. The reliability of the moving part can be ensured.

Embodiments of the present invention will be described below with reference to the drawings. Note that the present invention is not limited to the embodiments. Moreover, in each figure, about the same component, the same code | symbol is used and description is abbreviate | omitted.

(Embodiment 1)
FIG. 1 is a cross-sectional view of a hermetic compressor according to Embodiment 1 of the present invention. In FIG. 1, a hermetic compressor in which a compression mechanism portion 2 and an electric motor portion 3 are housed in a hermetic container 1 and each sliding portion of the compression mechanism portion 2 is lubricated by oil 4 enclosed in the hermetic container 1. The closed compressor is characterized in that the oil passage outlet 5a at the upper end of the crankshaft is closed, and an oil passage outlet 5b is provided in the crankshaft 5 in the range between the bearing portion 6 and the rotor 3a. is there.

  With this configuration, after oil is supplied to the bearing portion 6 by the rotation of the crankshaft 5, excess oil that has not been used for oiling is sent directly to the discharge pipe 7 through the oil passage outlet 5a at the upper end of the crankshaft. Is avoided, and the oil discharge amount can be reduced.

(Embodiment 2)
FIG. 2 is a cross-sectional view of the hermetic compressor according to the second embodiment of the present invention. In FIG. 2, the oil passage outlet 5a at the upper end of the crankshaft is closed with a bolt 11, and an oil passage outlet 5b is provided in the crankshaft 5 in the range between the bearing portion 6 and the rotor 3a instead. Type compressor.

  With this configuration, after oil is supplied to the bearing portion 6 by the rotation of the crankshaft 5, excess oil that has not been used for oiling is sent directly to the discharge pipe 7 through the oil passage outlet 5a at the upper end of the crankshaft. Is avoided, and the oil discharge amount can be reduced. Furthermore, since the oil passage can be penetrated when creating the crankshaft, it is easy not to leave a facet.

(Embodiment 3)
FIG. 3 is a cross-sectional view of a hermetic compressor according to Embodiment 3 of the present invention. In FIG. 3, the oil passage outlet 5b is provided, and its position is restricted to the same height range as the coil 3c of the stator 3b. By doing so, the oil that has jumped out of the oil passage outlet 5b by the centrifugal force caused by the rotation of the crankshaft 5 hits the coil 3c and adheres to the coil. According to this configuration, since it is difficult for oil to be mixed with the refrigerant gas discharged from the compression mechanism and passing through the notch 3e provided on the outer periphery of the stator 3b, the oil goes out of the compressor through the discharge pipe 7. The oil discharge amount can be reduced.

(Embodiment 4)
FIG. 4 is a cross-sectional view of a hermetic compressor according to Embodiment 4 of the present invention. In FIG. 4, the oil passage outlet 5b is provided, and its position is restricted to the same height range as the lower space 3d of the rotor 3a. The oil that has jumped out of the oil passage outlet 5b by the centrifugal force generated by the rotation of the crankshaft 5 hits the lower space 3d of the rotor 3a and adheres to the wall surface. According to this configuration, since it is difficult for oil to be mixed with the refrigerant gas discharged from the compression mechanism and passing through the notch 3e provided on the outer periphery of the stator 3b, the oil goes out of the compressor through the discharge pipe 7. The oil discharge amount can be reduced.

(Embodiment 5)
FIG. 5 is a sectional view of a hermetic compressor according to the fifth embodiment of the present invention. In FIG. 5, the oil passage outlet 5b is provided and its position is restricted to the same height range as the coil 3c of the stator 3b. Furthermore, by installing it in the range of the lower space 3d of the rotor 3a, the oil coming out from the oil passage outlet hits both the coil 3c and the lower space 3d and adheres. This configuration makes it difficult for oil to be mixed with the refrigerant gas discharged from the compression mechanism and passing through the notch 3e provided on the outer periphery of the stator 3b, so that the oil discharged from the discharge pipe 7 to the outside of the compressor. The amount can be reduced.

  As described above, the hermetic compressor according to the present invention has a simple structure and can reduce the oil discharge amount inexpensively and reliably, so that it can be used for refrigeration equipment such as an air conditioner and a refrigerator. Applicable.

Sectional drawing of the hermetic compressor in Embodiment 1 of this invention Sectional drawing of the hermetic compressor in Embodiment 2 of this invention Sectional drawing of the hermetic compressor in Embodiment 3 of this invention Sectional drawing of the hermetic compressor in Embodiment 4 of this invention Sectional drawing of the hermetic compressor in Embodiment 5 of this invention Cross section of a conventional hermetic compressor Cross section of the main part of a conventional hermetic compressor

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Airtight container 2 Compression mechanism part 3 Electric motor part 3a Rotor 3b Stator 3c Coil 3d Rotor lower space 3e Notch of outer periphery of stator 4 Oil 5 Crankshaft 5a Crankshaft upper end oil passage outlet 5b Crankshaft oil passage outlet 6 Bearing 7 Discharge Pipe 8 Oil Separator 9 Path 10 Oil Separator 11 Bolt

Claims (7)

In a compressor that houses a compression mechanism in a sealed container and lubricates each sliding part of the compression mechanism with oil sealed and stored in the sealed container, the upper end of the crankshaft is blocked, and a bearing for the crankshaft A hermetic compressor characterized in that an oil passage outlet is provided in a range located between the rotor portion and the rotor portion. 2. The hermetic compressor according to claim 1, wherein the upper end of the crankshaft is sealed with a bolt. The hermetic compressor according to claim 1, wherein the oil passage outlet position is installed within a range of a coil height of the stator. 3. The hermetic compressor according to claim 1, wherein the oil passage outlet position is installed in a range not in contact with the crankshaft in the lower space of the rotor. 3. The hermetic compression according to claim 1, wherein the oil passage outlet position is installed at two locations within a range of the coil height of the stator and within a range not in contact with the crankshaft in the lower space of the rotor. Machine. The hermetic compressor according to any one of claims 1 to 5, wherein the gas to be compressed is an alternative refrigerant that does not contain chlorine. The hermetic compressor according to any one of claims 1 to 5, wherein the gas to be compressed is a natural refrigerant such as carbon dioxide.

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