JP6209730B2 - Hermetic compressor - Google Patents

Description

The present invention relates to a hermetic compressor used for a refrigerator, an air conditioner, a dryer, and the like.

  Conventionally, as shown in FIG. 3, this type of hermetic compressor includes a compression mechanism 3 (including a piston or a roller) below the hermetic container 1, and the compression mechanism 3 is a compression chamber. , A top bearing and a bottom bearing fixed to the inner inner surface of the hermetic container 1, a piston inscribed in the compression chamber and rotating eccentrically, and a tip portion connected to the piston It consists of a partition plate (vane) that presses (contacts) and partitions the compression chamber into the suction side and compression chamber side.

  In addition, an electric motor unit 2 (a motor unit stator 2a and a motor unit rotor 2b in which a plurality of electromagnetic steel sheets are laminated) is housed above the sealed container 1.

  Further, a predetermined amount of refrigerating machine oil for lubricating the sliding portion of the compression mechanism portion 3 is sealed in the sealed container 1.

  Here, when the refrigerating machine oil is supplied to the compression mechanism unit 3, the refrigerating machine oil 4 in the refrigerating machine oil sump is sucked up from the lower end of the crankshaft through the refrigerating machine oil supply hole penetrating in the crankshaft direction. Refrigerating machine oil is supplied to each sliding portion of the compression mechanism portion 3 through supply holes formed in the orthogonal direction. The supplied refrigerating machine oil is finally collected in the refrigerating machine oil sump so as to obtain an escape place by gravity.

  In such a hermetic compressor, the compressed refrigerant 5 compressed in the compression chamber is discharged from the discharge hole provided in the lower bearing to the gap between the lower bearing and the lower valve cover, and then provided in the cylinder. It enters into the upper valve cover through the communication hole, is discharged from the hole provided in the upper valve cover to the high-pressure (discharge) chamber 7 in the sealed container 1, and circulates through the refrigeration cycle via the discharge pipe 6.

  In the conventional configuration, the sprayed refrigerating machine oil 4 passes directly through the high-pressure (discharge) chamber 7 including the electric motor unit 2 and is directly sent to the discharge pipe 6, which may increase the refrigerating machine oil discharge amount. there were.

  As a conventional technique for solving this problem, a refrigerating machine oil separator 8 having a refrigerating machine oil separator in a discharge pipe 6 and a path for returning the refrigerating machine oil in a high-pressure (discharge) chamber 7 as shown in FIG. The provided technology is known (for example, refer to Patent Document 1).

Japanese Patent Laid-Open No. 5-195975

  However, the conventional configuration has a problem that the amount of refrigerating machine oil separated by the compressed refrigerant that becomes a high-speed fluid during high-speed operation is re-wound and discharged into the refrigeration cycle.

  Accordingly, an object of the present invention is to provide a hermetic compressor that reduces the discharge amount of the refrigerating machine oil 4 contained in the compressed refrigerant that is compressed by the compression mechanism unit 3 and discharged from the discharge pipe 6 even during high-speed operation. Is.

In order to solve the above-described conventional problems, the hermetic compressor of the present invention is provided with a compression mechanism portion driven by an electric motor part inside the hermetic container, and the compression mechanism part is enclosed with the refrigerant inside the hermetic container. A hermetic compressor that discharges a refrigerant lubricated by refrigerating machine oil and compressed by a compression mechanism into a discharge chamber formed inside the sealed container, and then discharges it from a discharge pipe provided in the sealed container to the outside of the compressor. The hermetic compressor includes a refrigerating machine oil separator in a discharge chamber, and the refrigerating machine oil separator has a communication hole for introducing a compressed refrigerant from the discharge chamber into the separation chamber, and a refrigerating machine oil introduced from the communication hole. the content compressed refrigerant is separated into refrigerating machine oil and the compressed refrigerant by centrifugation, and the separation chamber for extracting the compressed refrigerant to the discharge pipe, made the separated refrigerating machine oil and refrigerant oil hole for dropping down from, and, prior to Separation chamber is lower top in a cylindrical shape so as to form a conical shape to reduce toward the refrigerating machine oil hole is a structure in which a tangential direction to the communication hole of the conical inner wall surface of the separation chamber top.

  The hermetic compressor of the present invention can reduce the amount of refrigeration oil discharged even during high-speed operation.

Sectional drawing of the principal part of the hermetic compressor in Embodiment 1 of this invention. Sectional drawing of the principal part 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 compression chamber

1st invention provides the compression mechanism part driven by an electric motor part in the inside of an airtight container, and the compression mechanism part was lubricated with the refrigeration oil enclosed with the refrigerant | coolant inside the airtight container, and was compressed by the compression mechanism part A hermetic compressor that discharges refrigerant into a discharge chamber formed inside a sealed container and then discharges the refrigerant from a discharge pipe provided in the sealed container to the outside of the compressor. A refrigerating machine oil separator, the refrigerating machine oil separator having a communication hole for introducing compressed refrigerant from the discharge chamber into the separation chamber; and a refrigerating machine oil-containing compressed refrigerant introduced from the communication hole into a compressed refrigerant and refrigerating machine oil by centrifugation. separated, and the separation chamber for extracting the compressed refrigerant to the discharge pipe, and the refrigerating machine oil hole for dropping the separated refrigerating machine oil downward, consists, and the lower separation chamber is at the top of cylindrical the refrigerating machine oil And forming a conical shape to reduce towards the located in the tangential direction of the conical inner wall surface of the separation chamber upper as structure provided with the communication hole, it is possible to refrigerating machine oil is reduced by discharging the discharge pipe .

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
1 is a cross-sectional view of main parts of a hermetic compressor according to Embodiment 1 of the present invention.

  In FIG. 1, the upper part of the high pressure (discharge) chamber 7 of the hermetic compressor in the vicinity of the discharge pipe 6 is cylindrical, and the lower part is formed in a conical shape toward the communication hole 12, and the separated refrigerating machine oil. Refrigerator oil holes 11 for dropping 4 downward, and communication holes 12 for connecting the high pressure (discharge) chamber 7 and the separation chamber 10 in the tangential direction of the circumferential inner wall surface of the upper portion of the separation chamber 10 are provided. The refrigerating machine oil separator 9 is configured such that the outlet of the refrigerating machine oil hole 11 on the high pressure (discharge) chamber 7 side is disposed close to the electric motor unit stator 2a. Thereby, the refrigerating machine oil 4 in the compressed refrigerant 5 discharged from the compression mechanism unit 3 is separated by the centrifugal force due to the swirling flow in the separation chamber 10, and the separated refrigerating machine oil 4 has a higher pressure (discharge) than the refrigerating machine oil hole 11. By discharging into the chamber 7, a hermetic compressor with a low refrigerating machine oil discharge rate can be provided.

Here, the configuration of the separation chamber 10 has a cylindrical shape at the top and a conical shape at the bottom toward the refrigerating machine oil hole, and a conical shape as shown in FIG. A communication hole 12 that guides the compressed refrigerant discharged from the compression mechanism 3 in the tangential direction of the inner wall surface of the portion into the separation chamber 10, and the separated refrigerating machine oil to the high pressure (discharge) chamber 7 at the bottom of the separation chamber 10. There is a refrigerating machine oil hole 11 to be discharged, and the outlet of the refrigerating machine oil hole 11 on the high pressure (discharge) chamber 7 side is disposed close to the motor unit stator 2a. As a result, the outlet of the refrigerator oil hole 11 on the high pressure (discharge) chamber 7 side is disposed close to the motor unit stator 2a, and therefore has a certain resistance to the flow of the compressed refrigerant to be discharged. Therefore, the backflow of the compressed refrigerant from the high pressure (discharge) chamber 7 side outlet side of the refrigerator oil hole 11 can be prevented.

(Embodiment 2)
FIG. 2 is a cross-sectional view of a main part of the hermetic compressor according to the second embodiment of the present invention. In the first embodiment, the separation chamber 10 is configured in series with the sealed container 1, but in this embodiment, as shown in FIG. 2, a pipe 13 that forms the separation chamber 10 and the communication hole 12 is provided in the discharge pipe 6. The other end of the refrigerating machine oil hole 11 is connected to the other end, and the outlet of the refrigerating machine oil hole 11 on the high pressure (discharge) chamber 7 side is disposed close to the motor unit stator 2a. In the second embodiment, the same effect as in the first embodiment can be obtained. In particular, in this configuration, by bending the pipe 13, the outlet of the high-pressure (discharge) chamber 7 side of the refrigerator oil hole 11 of the pipe 13 can be opened at an arbitrary position regardless of the position of the discharge pipe 6. The degree of freedom in layout of the compressor configuration is improved.

(Embodiment 3)
As described above, the refrigerating machine oil 4 in the compressed refrigerant 5 discharged from the compression mechanism unit 3 is separated by the centrifugal force due to the swirling flow in the separation chamber 10, so that this separation can be performed efficiently. A spiral groove or a convex object may be formed along the inner wall surface of the separation chamber 10. Thereby, the refrigerating machine oil-containing compressed refrigerant that has entered from the communication hole 12 can easily change the direction in the direction of the swirl flow after once colliding with the groove or the convex object. Can be easily separated.

  In this embodiment, the rotary type compressor has been described. However, the present invention is not limited to the type (type) of the compressor, and it can be applied to a scroll type compressor, a swing type rotary compressor, and the like. Absent.

  As described above, the hermetic compressor according to the present invention can be applied to an application using a heat pump because the discharge amount of refrigerating machine oil can be reduced.

DESCRIPTION OF SYMBOLS 1 Airtight container 2 Electric motor part 2a Electric motor part stator 2b Electric motor part rotor 3 Compression mechanism part 4 Refrigerating machine oil 5 Compressed refrigerant 6 Discharge pipe 7 High pressure (discharge) chamber 9 Refrigerating machine oil separator 10 Separation room 11 Refrigerating machine oil hole 12 Communication hole 13 pipe

Claims (3)

A compression mechanism driven by an electric motor is provided inside the sealed container, and the compression mechanism is lubricated by refrigerating machine oil enclosed with the refrigerant in the sealed container, and the refrigerant compressed by the compression mechanism is A hermetic compressor that discharges to the outside of the compressor from a discharge pipe provided in the hermetic container after being discharged into a discharge chamber formed inside the hermetic container,
The hermetic compressor comprises a refrigerator oil separator in the discharge chamber,
The refrigerating machine oil separator separates the compressed refrigerant and the refrigerating machine oil into a compressed refrigerant and a refrigerating machine oil by centrifugal separation through a communication hole for introducing the compressed refrigerant from the discharge chamber into the separation chamber, and the refrigerating machine oil-containing compressed refrigerant introduced from the communication hole. The separation chamber to be extracted into the discharge pipe, and a refrigerator oil hole for dropping the separated refrigerator oil downward,
The separation chamber is formed in a cylindrical shape in the upper part and the lower part is formed in a conical shape that decreases toward the refrigerator oil hole, and the communication hole is provided in the tangential direction of the conical inner wall surface in the upper part of the separation chamber. Compressor. The hermetic compressor according to claim 1, wherein a spiral groove or a convex object is formed along the inner wall surface of the separation chamber. The motor unit has a motor unit stator disposed below the refrigerator oil separator,
3. The hermetic compressor according to claim 1, wherein the outlet of the refrigerator oil hole on the discharge chamber side is disposed close to the electric motor unit stator.