JP2007239713A - Hermetic compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To inhibit refrigerant gas discharged from a communication hole from flying up oil and being discharged to an outside of a compressor together with oil. <P>SOLUTION: A delivery pipe 11 opening at a position higher than lubricating oil level surface is provided at an opening part of a communication hole 10 provided on an upper bearing 6 and delivering refrigerant to an inner space of a hermetic vessel 1. Consequently, even if oil level surface gets higher than an upper bearing opening part of the communication hole 10 or oil stays at an upper end of the upper bearing 6, the discharged refrigerant does not fly up oil, oil discharge quantity can be surely reduced, and reliable hermetic compressor can be provided. <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. 3, 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 is contained in the hermetic container 1. Is enclosed and stored in the bottom of the sealed container. Refrigerant gas compressed by the compression mechanism portion is discharged from a discharge hole 8 a provided in the lower bearing 8 into a closed space formed by the lower bearing 8 and the valve cover 5, and is provided in the lower bearing 8, the cylinder 9, and the upper bearing 6. The refrigerant gas is discharged into the sealed container 1 through the formed communication hole 10, and is sent to the discharge pipe 7 through the notch 3 d provided in the stator 3 a of the electric motor 3.

  In the above conventional configuration, for example, when the oil level is higher than the communication hole 10 of the upper bearing 6 or when the oil stays at the upper end of the upper bearing 6, the refrigerant discharged from the communication hole 10 winds up the oil. Since it becomes sprayed, rides on the flow of the refrigerant, passes through the notch 3d provided in the stator 3a of the electric motor, and is sent to the discharge pipe 7, there is a possibility that the oil discharge amount increases. .

As a conventional technique for solving this problem, a technique in which an oil separator 12 having an oil separator 12 and a path 13 for returning oil into the sealed container 1 is provided in a discharge pipe 7 as shown in FIG. (For example, refer to Patent Document 1).
Japanese Patent Laid-Open No. 5-195975

  However, the conventional configuration has a problem that the oil separator 14 having the oil separator 12 and the path 13 for returning the oil 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 amount of oil contained in refrigerant gas that is compressed by a compression mechanism and discharged from a discharge pipe 7.

  The configuration of the hermetic compressor according to the present invention for solving the above-described conventional problems is that the compression mechanism part and the motor part are accommodated in the hermetic container, and the sliding part of the compression mechanism part is lubricated in the hermetic container. Oil is enclosed and stored in the bottom of the sealed container. Refrigerant gas compressed by the compression mechanism from the discharge hole provided in the lower bearing is discharged into the closed space formed by the lower bearing and the valve cover, and passes through the communication holes provided in the lower bearing, the cylinder, and the upper bearing. A hermetic compressor in which refrigerant gas is discharged into a hermetic container and is sent to a discharge pipe through a notch provided in the stator of the electric motor. A discharge pipe having a diameter and a length that do not contact each other is installed so that the opening is positioned higher than the lubricating oil surface.

  With this configuration, even when the oil level is higher than the communication hole of the upper bearing, or even when oil stays in the upper part of the upper bearing, the refrigerant discharged from the communication hole of the upper bearing does not lift the oil. Since it can discharge from a compression mechanism part, oil discharge amount can be reduced reliably.

A diameter that does not contact the stator and rotor so that the refrigerant does not wind up oil in the communication hole of the upper bearing.
A discharge pipe with a length is installed.

  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.

  1st invention accommodates the compression mechanism part and an electric motor part in an airtight container, the oil for lubricating the sliding part of a compression mechanism part is enclosed in an airtight container, and the airtight which is stored by the airtight container bottom part A refrigerant compressor compressed by the compression mechanism from a discharge hole provided in the lower bearing is discharged into a closed space formed by the lower bearing and the valve cover, and is provided in the lower bearing, the cylinder, and the upper bearing. The refrigerant gas is discharged into the sealed container through the formed communication hole. The refrigerant gas is a hermetic compressor that is sent to a discharge pipe through a notch provided in the stator of the electric motor, and is discharged in a size that does not contact the stator or rotor through the communication hole of the upper bearing. A pipe is installed. With this configuration, even when the oil level is higher than the communication hole of the upper bearing or when the oil stays in the upper part of the upper bearing, the refrigerant discharged from the communication hole of the upper bearing does not wind up the oil. Can be discharged from the compression mechanism, so that the oil discharge amount can be reliably reduced.

  According to a second aspect of the invention, in particular, in the compressor according to the first aspect of the present invention, the direction in which the refrigerant in the discharge pipe is discharged is restricted to the same height range as the coil end of the stator. Since the refrigerant coming out of the pipe hits the coil end and oil adheres to the coil end, the refrigerant with a small amount of oil passes through the notch provided on the outer periphery of the stator and goes out of the compressor from the discharge pipe. As a result, the amount of oil discharged to the outside of the compressor can be reduced.

  In the third aspect of the invention, in particular, in the hermetic compressor according to any one of the first and second 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 the fourth aspect of the invention, in particular, in the hermetic compressor according to any one of the first and second aspects, when the gas to be compressed is a natural refrigerant such as carbon dioxide, the gas discharged from the compressor has a high pressure. It is necessary to secure a large amount of oil in the sealed container because the sliding part must have a large load bearing capacity, but the present invention can reduce the amount of oil discharged outside the sealed container. The reliability of the sliding 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, the compression mechanism part 2 and the motor part 3 are accommodated in the airtight container 1, and the oil 4 for lubricating the sliding part of the compression mechanism part 2 is enclosed in the airtight container 1, and the bottom part of the airtight container is filled. Stored.

  Refrigerant gas compressed by the compression mechanism portion 2 is discharged from a discharge hole 8 a provided in the lower bearing 8 into a closed space formed by the lower bearing 8 and the valve cover 5, and is discharged to the lower bearing 8, the cylinder 9, and the upper bearing 6. A hermetic compressor in which refrigerant gas is discharged into the hermetic container 1 through the provided communication hole 10 and is sent to the discharge pipe 7 through a notch 3d provided in the stator 3a of the electric motor. A discharge pipe 11a is provided in the communication hole 10 of the upper bearing 6 so as not to contact the stator 3a or the rotor 3b, and the opening is positioned higher than the oil level of the lubricating oil.

  With this configuration, even when the oil level is higher than the communication hole 10 of the upper bearing 6 or when the oil stays in the upper part of the upper bearing 6, the oil is not wound up and is discharged from the discharge pipe 11 a installed in the upper bearing. The refrigerant is discharged, and the refrigerant with a small amount of oil passes through the notch 3d provided on the outer periphery of the stator 3a and exits from the discharge pipe 7 to the outside of the compressor. The 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. The hermetic compressor according to the first embodiment is characterized in that the direction in which the refrigerant in the discharge pipe installed in the upper bearing is discharged is regulated to a height in the same range as the coil 3c of the stator 3a. It is a hermetic compressor.

  According to this configuration, the sprayed oil contained in the refrigerant discharged from the upper bearing installation discharge pipe 11b hits the coil 3c, and the oil adheres to the coil 3c. Since the oil flows out of the compressor through the discharge pipe 7 through the notch 3d provided on the outer periphery of 3a, the oil discharge 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 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 Stator 3b Rotor 3c Coil end 3d Notch part provided in outer periphery of stator 4 Oil 5 Valve cover 6 Upper bearing 7 Discharge pipe 8 Lower bearing 8a Discharge hole 9 Cylinder 10 Communication hole 11a Discharge pipe 11b in the first embodiment 11b Discharge pipe in the second embodiment 12 Oil separator 13 Oil return path 14 Oil separator

Claims (4)

An electric motor and a compression mechanism are housed in a substantially cylindrical closed container that stores lubricating oil at the bottom, and the compression mechanism is sandwiched between an upper bearing provided on the motor side and a lower bearing provided on the counter-motor side. A valve cover that forms a closed space facing the discharge hole that opens in the lower bearing, and the refrigerant gas discharged into the closed space passes through the cylinder from the lower bearing to the upper bearing through the interior. A hermetic compressor that is discharged through a discharge pipe that opens to a position higher than the oil level of the lubricating oil via a hole and then discharged to the outside from a discharge pipe provided in the hermetic container. The hermetic compressor according to claim 1, wherein the refrigerant discharge direction of the discharge pipe is a direction in which the refrigerant collides with the coil end of the motor stator. The hermetic compressor according to claim 1, wherein the refrigerant gas is an alternative refrigerant that does not contain chlorine. The hermetic compressor according to claim 1 or 2, wherein the refrigerant gas is a natural refrigerant such as carbon dioxide.

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