JP2010106705A - Hermetic electric compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To inhibit refrigerator oil contained in refrigerant gas from being discharged into a refrigeration cycle from an electric compressor. <P>SOLUTION: A ring shape groove is provided on a hermetic vessel inner wall part and an oil return passage communicating to the same is provided on the hermetic vessel inner wall surface. Thereby, refrigerator oil is separated from refrigerant gas at the ring shape groove, and is effectively guided to a refrigerator oil reservoir at a lower part of an electric compressor through the oil return passage. Consequently, the electric compressor having excellent performances and inhibiting refrigerator oil from being discharged to an outside of the electric compressor is provided. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a hermetic electric compressor such as a scroll compressor or a rotary compressor used in an air conditioner or a refrigerator.

  Conventionally, in this type of hermetic electric compressor, refrigeration oil jumps out of the compressor along the flow of refrigerant gas circulating in the refrigeration cycle. When this pop-out amount (hereinafter referred to as discharge amount) increases, it greatly affects the performance deterioration of the refrigeration cycle. Conventionally, the refrigerating machine oil in the refrigerant gas is separated inside the compressor to reduce the discharge amount outside the compressor. Various measures have been taken (see, for example, Patent Document 2).

  FIG. 5 shows a longitudinal section of a conventional hermetic electric compressor. As shown in FIG. 5, a compression mechanism (not shown), a bearing (not shown), and an electric motor 7 are accommodated in the sealed container 1, and a refrigerating machine oil sump (not shown) is disposed below the sealed container 1. Z).

  A spiral spring (not shown) for supplying refrigeration oil to the compression mechanism is incorporated at the tip of the crankshaft 8 supported by the bearing.

  When the electric compressor is actuated, as the crankshaft 8 is rotated, this spring is also rotated, whereby the refrigerating machine oil in the refrigerating machine oil pool is pumped up to lubricate each sliding portion of the compression mechanism.

At this time, since the refrigerating machine oil that has lubricated the compression mechanism is mixed with the compressed refrigerant gas discharged from the compression mechanism and discharged to the outside of the compressor, in order to reduce the discharge amount, the motor unit 7 and the compression mechanism A recess 13 is provided at the end of the crankshaft 8 connecting the parts, the discharge pipe 5 is disposed in or above the recess, the wall surface of the recess is inclined, and the bottom of the recess penetrates the crankshaft. It is set as the structure which provides the hole and accelerates | stimulates discharge | emission of the refrigeration oil from a hollow (for example, refer patent document 1).
JP 2007-187008 A JP 2007-247443 A

  The conventional configuration described above has an effect of suppressing the refrigerating machine oil caught in the refrigerant gas flow from being discharged to the outside of the electric compressor. However, when a request for further performance improvement of the refrigerating cycle occurs. In light of this, further improvements in hermetic electric compressors are necessary.

  Specifically, since the refrigerating machine oil has the property of being dissolved in the refrigerant gas, it is necessary to take measures to separate the refrigerating machine oil before the refrigerant gas flow is discharged from the electric compressor.

  In order to solve the above-described conventional problems, an object of the present invention is to provide a sealed electric compressor having high performance and reliability by promoting the separation of refrigeration oil in refrigerant gas inside the electric compressor. .

In order to solve the conventional problems, as a first means, a hermetic electric compressor according to the present invention includes a compression mechanism section, a motor section that drives the compression mechanism section, and a crankshaft that transmits the rotational force of the motor section to the compression mechanism section. And an electric compression mechanism comprising a bearing that rotatably supports the crankshaft in a hermetic container, and a structure in which a ring-shaped groove is provided on the inner wall of the hermetic container in the upper direction of the compressor It is said.

  Further, as a second means, an oil return passage is provided on the inner wall surface of the hermetic container of the hermetic electric compressor according to the present invention, and this passage is communicated with the ring-shaped groove.

  As a third means, the hermetic electric compressor according to the present invention is configured such that the width of the oil return passage provided on the inner wall surface of the closed container is larger than the depth.

  Further, as a fourth means, the oil return passage of the hermetic electric compressor according to the present invention is configured to be covered with a lid-like member in a direction below a position where the ring-shaped groove is disposed.

  Further, as a fifth means, the oil return passage of the hermetic electric compressor according to the present invention is configured by disposing another member on the inner wall surface of the hermetic container in a portion close to the ring-shaped groove.

  The hermetic electric compressor of the present invention promotes the separation of refrigeration oil in the refrigerant gas inside the compressor before the refrigerant gas flow is discharged from the compressor, and is a hermetic type with high performance and reliability. An electric compressor is provided.

  1st invention seals the electric compression mechanism which consists of a bearing which supports the crankshaft which transmits the rotational force of a compression mechanism part, a compression mechanism part, and a motor part to a compression mechanism part, and a crankshaft rotatably. A hermetic electric compressor housed in a container is provided with a ring-shaped groove on the inner wall of the hermetic container in the upper direction of the compressor.

  Refrigerant gas containing refrigerating machine oil blows up in the sealed container of the electric compressor, collides with this ring-shaped groove, and the refrigerating machine oil adheres to the inner wall surface of the sealed container when the gas flow direction is suddenly changed. Thus, the effect of separating the refrigerating machine oil from the refrigerant gas is obtained.

  In the second invention, an oil return passage is provided on the inner wall surface of the hermetic container of the hermetic electric compressor, and this passage is communicated with the ring-shaped groove.

  As a result, the refrigerating machine oil separated from the refrigerant gas and deposited in the ring-shaped groove is returned to the refrigerating machine oil reservoir provided at the lower portion of the hermetic container using the oil return passage as a flow path.

  When the refrigerating machine oil falls along the inner wall surface of the sealed container in the form of a bowl-shaped lump, it is again taken into the refrigerant gas that blows up inside the sealed container.

  On the other hand, according to the oil return passage according to the present invention, the refrigeration oil separated and deposited in the ring-shaped groove flows down through the oil return passage as a flow passage for the refrigeration oil. For this reason, since the falling speed is also increased due to the effect of the weight of the refrigeration oil itself, the frequency of re-mixing into the blown-up refrigerant gas in the sealed container is reduced, and as a result, the amount of refrigeration oil discharged outside the electric compressor Can be reduced.

  In a third aspect of the invention, the hermetic electric compressor is configured such that the width of the oil return passage provided on the inner wall surface of the hermetic container is larger than the depth.

  Thereby, even when the thickness of the member of the sealed container is thin, an oil return passage having a sufficient cross-sectional volume can be configured, and the suction action of the refrigerating machine oil to the oil return passage is increased.

  In a fourth aspect of the invention, the oil return passage of the hermetic electric compressor is covered with a lid-like member in a direction below the position where the ring-shaped groove is disposed.

  As a result, even if the refrigeration oil flowing down the oil return passage accumulates due to a decrease in the flow velocity in the middle of the passage and overflows from the passage, the refrigeration oil is fed into the refrigeration oil reservoir without being caught in the blowing up of the refrigerant gas in the sealed container I can guide you.

  In a fifth aspect of the invention, the oil return passage of the hermetic electric compressor is configured by disposing another member on the inner wall surface of the hermetic container at a portion near the ring-shaped groove.

  As a result, the ring-shaped groove shape can be set wider and larger in size, so that the separation of the refrigerating machine oil in the refrigerant gas is further promoted, and at the same time, the refrigerating machine oil that moves the oil return passage toward the refrigerating machine oil reservoir Remixed in the refrigerant gas.

  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)
FIG. 1 shows a vertical partial cross-sectional view of a hermetic electric compressor according to first to third embodiments of the present invention. FIG. 3 is a partially enlarged view showing the ring-shaped groove 3 and the oil return passage 4 in FIG.

  FIG. 1 shows a compression mechanism section 9, an electric motor section 7 that drives the compression mechanism section, a crankshaft 8 that transmits the rotational force of the electric motor section 7 to the compression mechanism section 9, and a bearing 10 that rotatably supports the crankshaft 8. A hermetic electric compressor 1 in which an electric compression mechanism made of

  1 and 3, a ring-shaped groove 3 is provided in the inner wall portion of the hermetic container 2 in the upper direction of the hermetic electric compressor 1, and an oil return passage 4 is provided so as to communicate with the ring-shaped groove 3. The oil return passage 4 is disposed on the inner wall surface of the sealed container 2 so that the depth dimension is smaller than the width dimension.

  Now, when the compression mechanism 9 is operated via the crankshaft 8 by the rotational force of the electric motor 7, the refrigerant gas (not shown) sucked from the external refrigeration cycle (not shown) of the hermetic electric compressor 1 is compressed. After being compressed by the mechanism unit 9 to become high-pressure gas, it is discharged into the sealed container 2. At this time, since the refrigerating machine oil is supplied from the refrigerating machine oil reservoir 11 provided in the lower part of the hermetic container 2 to the compression mechanism unit 9 and used for lubrication, the high-pressure gas is in a state where the refrigerant gas and the refrigerating machine oil are mixed. Yes.

  The refrigerant gas mixed with the refrigerating machine oil is returned again into the refrigeration cycle through the discharge pipe 5, but the main flow of the refrigerant gas inside the sealed container 2 at this time is discharged from the compression mechanism 9, After passing through the bearing 10, passing through a gas flow path (not shown) provided between the electric motor unit 7 and the hermetic container 2, the refrigeration oil is scraped to some extent at the winding part 6 of the electric motor unit stator, and then sealed. It rises along the inner wall surface of the container 2 and collides with the ring-shaped groove 3.

  Since the refrigerant gas mixed with the refrigerating machine oil after the refrigerating machine oil is scraped off to some extent by the winding part 6 collides with the ring-shaped groove 3, the direction of the flow is rapidly changed. As a result, the refrigerating machine oil is separated from the refrigerant gas, and only the refrigerant gas having a small amount of oil goes out of the sealed container 2 through the discharge pipe 5.

The refrigerating machine oil accumulated in the ring-shaped groove 3 falls inside the hermetic container 2 through the oil return passage 4 communicating with the groove, and finally the refrigerating machine oil reservoir provided in the lower part of the container. 11 is returned.

  On the other hand, the oil return passage 4 is configured to be engraved in the inner wall surface of the sealed container 2 in this embodiment, and the width dimension is sufficiently large with respect to the depth dimension thereof. It is excellent in adsorbing property, falls by its own weight along the wall surface, and reaches the refrigerator oil sump 11.

  Therefore, the refrigerating machine oil that is separated and flows through the oil return passage 4 is not involved in the flow of the refrigerant gas that blows up again in the sealed container 2.

(Embodiment 2)
FIG. 2 is a vertical partial sectional view of a hermetic electric compressor according to the first to fifth embodiments of the present invention. FIG. 4 is a partially enlarged view showing the ring-shaped groove 3, the oil return passage 4 and the member 12 constituting the passage in FIG.

  2 and 4, a ring-shaped groove 3 is provided in the inner wall portion of the hermetic container 2 in the upper direction of the hermetic electric compressor 1, and the thin resin-based separate member 12 is communicated with the ring-shaped groove 3. The oil return passage 4 is provided by using the oil return passage 4, and the oil return passage 4 is disposed on the inner wall surface of the hermetic container 2 so that the width dimension is larger than the depth dimension.

  Furthermore, an oil return passage 4a is provided in a structure engraved on the inner wall surface of the sealed container 2 from the middle to the lower part of the sealed container 2, and the bottom portion of the separate member 12 is configured to cover the oil return passage 4a. Yes.

  Now, when the compression mechanism 9 is operated via the crankshaft 8 by the rotational force of the electric motor 7, the refrigerant gas (not shown) sucked from the external refrigeration cycle (not shown) of the hermetic electric compressor 1 is compressed. After being compressed by the mechanism unit 9 to become high-pressure gas, it is discharged into the sealed container 2. At this time, since the refrigerating machine oil is supplied from the refrigerating machine oil reservoir 11 provided in the lower part of the hermetic container 2 to the compression mechanism unit 9 and used for lubrication, the high-pressure gas is in a state where the refrigerant gas and the refrigerating machine oil are mixed. Yes.

  The refrigerant gas mixed with the refrigerating machine oil is returned again into the refrigeration cycle through the discharge pipe 5, but the main flow of the refrigerant gas inside the sealed container 2 at this time is discharged from the compression mechanism 9, After passing through the bearing 10, passing through a gas flow path (not shown) provided between the electric motor unit 7 and the hermetic container 2, the refrigeration oil is scraped to some extent at the winding part 6 of the electric motor unit stator, and then sealed. It rises along the inner wall surface of the container 2 and violently collides with the ring-shaped groove 3.

  Since the refrigerant gas mixed with the refrigerating machine oil after the refrigerating machine oil is scraped off to some extent by the winding part 6 collides with the ring-shaped groove 3, the direction of the flow is rapidly changed. As a result, the refrigerating machine oil is separated from the refrigerant gas, and only the refrigerant gas having a small amount of oil goes out of the sealed container 2 through the discharge pipe 5.

  The refrigerating machine oil separated in the ring-shaped groove 3 flows down through the oil return passage 4 communicating with the groove, and further falls inside the sealed container 2 using the oil return passage 4a as a flow path. Finally, it is returned to the refrigerating machine oil sump 11 provided at the lower part of the sealed container 2.

  At this time, since the bottom part of the separate member 12 constituting the oil return passage 4 covers the oil return passage 4a at the connecting portion from the oil return passage 4 to 4a, the refrigerating machine oil flowing through the passage passes through the inside of the hermetic container 2. There is no re-engagement in the flow of refrigerant gas that blows up.

On the other hand, the oil return passage 4 has a sufficiently large width dimension with respect to its depth, so that it has excellent refrigerating machine oil adsorbing properties on the wall surface of the passage, falls down along its wall surface, and reaches the refrigerating machine oil sump 11. To do.

  For this reason, the refrigerating machine oil flowing through the oil return passage 4 after being separated is never caught in the flow of the refrigerant gas that blows up inside the sealed container 2.

  As described above, the hermetic electric compressor according to the present invention can effectively separate the refrigerating machine oil contained in the refrigerant gas inside the electric compressor, so that it is used for an air conditioner, a refrigerator, a washing dryer, and the like. Applicable to various products, such as scroll compressors and rotary compressors, that stabilize the performance of the refrigeration cycle by suppressing the amount of refrigeration oil discharged into the refrigeration cycle and ensure excellent performance. it can.

Sectional drawing of the hermetic type electric compressor in Embodiment 1 of this invention Sectional drawing of the hermetic type electric compressor in Embodiment 2 of this invention 1 is a partially enlarged view of FIG. 1 showing Embodiment 1 of the present invention. The elements on larger scale of FIG. 2 which show Embodiment 2 of this invention Cross-sectional view of hermetic electric compressor according to conventional technology

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Sealing type electric compressor 2 Sealing container 3 Ring-shaped groove 4 Oil return path 4a Oil return path 5 Discharge pipe 6 Winding 7 Motor part 8 Crankshaft 9 Compression mechanism 10 Bearing 11 Refrigerating machine oil reservoir 12 Separate member 13 Indentation

Claims (5)

An electric compression mechanism comprising a compression mechanism section, an electric motor section that drives the compression mechanism section, a crankshaft that transmits the rotational force of the electric motor section to the compression mechanism section, and a bearing that rotatably supports the crankshaft is housed in an airtight container. A hermetic electric compressor, characterized in that a ring-shaped groove is provided on the inner wall of the hermetic container in the upper direction of the compressor. 2. The hermetic electric compressor according to claim 1, wherein an oil return passage is provided on the inner wall surface of the hermetic container, and the passage is communicated with the ring-shaped groove. 3. The hermetic electric compressor according to claim 2, wherein a width dimension of the oil return passage is larger than a depth dimension. 4. The hermetic electric compressor according to claim 2, wherein the oil return passage is covered with a lid-like member in a direction below a position where the ring-shaped groove is disposed. A hermetic electric compressor. 4. The hermetic electric compressor according to claim 2, wherein the oil return passage is configured by disposing another member on the inner wall surface of the hermetic container at a portion close to the ring-shaped groove. A sealed electric compressor.