JP2009002287A - Hermetic compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To feed an oil stably to a bearing of a crankshaft or a sliding section of a compressor mechanism when a compressor is in operation without increasing an oil sealing amount. <P>SOLUTION: Steps are formed at the bottom section of an oil sump 4 to form the deepest section, and an oil intake port 10 is arranged right above the deepest section of the oil sump 4. This can facilitate reservation of oil 5 in the oil sump 4 even when the oil 5 is pressed to a wall surface in a hermetic container 6 by centrifugal force by rotation of the crankshaft 1 since the bottom section of the oil sump 4 is in the stepped shape. Consequently, it can reduce the oil sealing amount and enable stable oil feeding to the bearing 9 of the crankshaft 1 or the sliding section of the compressor mechanism 7 during operation. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a hermetic compressor for use in commercial or household, vehicle refrigeration and air conditioning, or refrigeration equipment.

  Conventionally, this type of hermetic compressor supplies oil sucked from an oil reservoir to the bearing and compression mechanism through an oil suction port in order to prevent damage and seizure of the bearing and compression mechanism. A structure is employed in which a partition plate is provided in order to reduce oil take-out due to gas, and an oil return hole is provided in the partition plate so that the oil can be easily returned to the oil reservoir (see, for example, Patent Document 1).

FIG. 5 shows a conventional hermetic compressor described in Patent Document 1. In FIG. As shown in FIG. 5, it has the structure which provides the some oil return hole 3 in the outer periphery of the partition plate 2 which the crankshaft 1 penetrates. This prevents the oil 5 in the oil reservoir 4 from going up by the partition plate 2 during the compressor operation, and allows the oil return to the oil reservoir 4 to be smoothly returned by the oil return hole 3, thereby causing damage and seizure of the bearing. Occurrence can be prevented.
JP-A-3-47496

  However, in the conventional configuration, the oil is pressed against the outer end in the sealed container by the centrifugal force generated when the main shaft rotates, so that the oil oil level around the main shaft is lowered. Since the amount of oil supplied to the bearing and the compression mechanism is reduced due to the lowering of the oil level, and there is a risk of damage to the bearing and seizure, it is necessary to increase the amount of oil filled in advance. However, if the amount of oil is increased, the resistance increases when the main shaft rotates due to the rise in the oil level, so that the input increases, and the oil is easily blown up by the refrigerant gas. Since the discharge amount also increases, there is a problem that the performance of the system using the compressor is deteriorated.

  The present invention solves the above-described conventional problems, and provides a hermetic compressor that can stably supply oil to a bearing portion of a crankshaft and a sliding portion of a compression mechanism without increasing the amount of oil filling. For the purpose of provision.

  In order to solve the above-described conventional problems, a hermetic compressor according to the present invention includes a compression mechanism and an electric motor disposed in a hermetic container having an oil sump at the bottom, and a crank that transmits the rotational force of the electric motor to the compression mechanism. A hermetic compressor having a shaft and an oil suction port for supplying oil in the oil reservoir to a bearing portion of the crankshaft and a sliding portion of the compression mechanism, wherein a step is provided at the bottom of the oil reservoir. The deepest part is formed, and the oil suction port is provided directly above the deepest part of the oil reservoir.

  Accordingly, oil can be easily sucked from the suction port, and shortage of oil supplied to the bearing portion of the crankshaft and the sliding portion of the compression mechanism can be prevented without increasing the oil filling amount.

In the hermetic compressor of the present invention, the deepest part of the oil sump is located directly below the oil suction port even when oil is pressed to the outside of the hermetic container by centrifugal force due to rotation of the crankshaft during operation. A stable amount of oil can be supplied to the bearing portion and the sliding portion of the compression mechanism.

  According to the first aspect of the present invention, a compression mechanism and an electric motor are arranged in a closed container having an oil sump at the bottom, a crankshaft that transmits the rotational force of the electric motor to the compression mechanism, and oil in the oil sump is cranked. A hermetic compressor having an oil suction port for supplying to a shaft bearing portion and a sliding portion of a compression mechanism, forming a deepest portion by providing a step at the bottom of the oil reservoir, and the oil suction port is an oil suction port It is provided directly above the deepest reservoir. According to this configuration, even when the oil is pressed against the wall surface in the sealed container by the centrifugal force due to the rotation of the crankshaft, the bottom of the oil sump has a stepped shape, so that it is easy to secure the oil in the oil sump. The amount of oil can be reduced and the deepest part of the oil reservoir is located directly below the oil inlet, so that oil can be stably supplied to the crankshaft bearing and the sliding part of the compression mechanism during operation. It becomes.

  In the present invention described in claim 2, in particular, the step portion of the oil sump bottom portion described in claim 1 is provided with an inclination toward the deepest portion. According to this configuration, it is possible to promote the flow of oil into the deepest part of the bottom of the oil reservoir, and it is possible to supply oil more stably to the bearing portion of the crankshaft and the sliding portion of the compression mechanism during operation.

  According to a third aspect of the present invention, a compression mechanism and an electric motor are arranged in a closed container having an oil sump at the bottom, a crankshaft that transmits the rotational force of the electric motor to the compression mechanism, and oil in the oil sump is transferred to the crankshaft. A hermetic compressor having an oil suction port for supplying to a bearing portion and a sliding portion of a compression mechanism, wherein a block with a step is installed at the bottom of the oil sump, and the oil suction port is a block step portion. It is provided directly above the deepest part. According to this configuration, since the oil level can be raised by installing the block, the amount of oil filling can be reduced, and the deepest part of the stepped part of the block is located directly below the suction port, so that the crank during operation Oil can be stably supplied to the shaft bearing portion and the sliding portion of the compression mechanism.

  In the present invention described in claim 4, in particular, the step portion of the block described in claim 3 is inclined toward the deepest portion. According to this configuration, it is possible to promote the flow of oil into the bottom of the block, and it is possible to supply oil more stably to the bearing portion of the crankshaft and the sliding portion of the compression mechanism during operation.

  In the present invention described in claim 5, the material of the block described in claim 3 or claim 4 is a magnet. According to this configuration, in addition to the effects of claim 3 or claim 4, it is possible to fix with magnetic force, so that installation is facilitated, and fine foreign matter such as iron powder existing in the oil due to magnetic force. Therefore, it is possible to stably supply oil with little danger such as entrapment of foreign matter.

The present invention according to claim 6 is characterized in that, in particular, the working fluid of the hermetic compressor according to any one of claims 1 to 5 uses CO ₂ which is a high-pressure refrigerant. . When CO ₂ is used as the refrigerant, the engine operates at a high speed, so oil is often taken out and there is a concern that the amount of oil stored in the oil reservoir will decrease. In this case as well, the deepest oil reservoir is located directly below the oil inlet. Positioning the part facilitates oil suction from the oil suction port, and can stably supply oil to the bearing part of the crankshaft and the sliding part of the compression mechanism during operation.

  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 is a longitudinal sectional view of a hermetic compressor according to Embodiment 1 of the present invention. In FIG. 1, the same components as those of the conventional hermetic compressor of FIG.

  In FIG. 1, this hermetic compressor includes a compression mechanism 7 in a hermetic container 6, an electric motor 8 for driving the compression mechanism 7, and a crankshaft 1 for transmitting the rotational force of the electric motor 8 to the compression mechanism 7. An oil suction port 10 is disposed through the crankshaft 1 to supply oil 5 in an oil sump 4 provided in the lower part of the sealed container 6 to the bearing portion 9 of the crankshaft 1 and the sliding portion of the compression mechanism 7. A compression mechanism in which the refrigerant gas 11 discharged from the refrigerant 7 exits the in-container discharge chamber 14 formed by the muffler 13 provided so as to cover the discharge port 12 at the top of the compression mechanism 1 and communicates with the lower part of the compression mechanism 7. The rotor 15 enters the rotor upper chamber 17 through the communication passage 15 and the communication passage 16, reaches the motor lower chamber 20 from the rotor upper chamber 17 through the rotor lower chamber 19 through the rotor passage 18 provided in the rotor 8a. Stator 8b, or After passing through the stator passage 21 provided between the stator 8b and the hermetic container 6 and passing through the stator upper chamber 22 around the communication path 16, the compressor mechanism ascending communication passage 23 is entered into the compression mechanism upper chamber 24, The air is discharged out of the sealed container 6 through an external discharge port 25 provided in the compression mechanism upper chamber 24.

  The operation and action of the hermetic compressor configured as described above will be described below.

  The oil 5 stored in the oil reservoir 4 provided in the hermetic container 6 is sucked up from the oil suction port 10 and passes through the crankshaft 1 to the sliding portion of the compression mechanism 7 and the sliding portion of the bearing portion 9. Supplied. The oil 5 supplied to each part is mixed with the refrigerant gas 11 and discharged from the compression mechanism 7 through the discharge port 12 to the discharge port 14 in the container, passes through the compression mechanism communication path 15 and the communication path 16, and passes over the rotor 8a. Enters the rotor upper chamber 17 at. When passing through the rotor passage 18 connecting the rotor upper chamber 17 and the rotor lower chamber 19 below the rotor 8a, the refrigerant gas 11 and the oil 5 are separated again by the centrifugal force generated by the rotation of the rotor 8a. 11 enters the compression mechanism upper chamber 24 through the motor lower chamber 20, the stator passage 21, the stator upper chamber 22, and the compression mechanism ascending communication passage 23, and is discharged to the system side (not shown) through the external discharge port 25. On the other hand, the oil 5 separated from the refrigerant gas 11 is dropped into the oil reservoir 4. Part of the oil 5 not supplied into the compression mechanism 7 returns to the oil sump 4 via the outside of the crankshaft 1. When the oil level of the oil in the oil sump 4 reaches the rotating part of the crankshaft 1, the oil 5 is pressed against the wall surface of the sealed container 6 by the centrifugal force caused by the rotation of the crankshaft 1, and the oil level around the crankshaft 1 is The oil reservoir 4 has a step, and the oil 5 falls downward due to gravity, so that the oil 5 is inevitably stored in the deepest part, and the oil 5 to be supplied is secured. Can do.

  As described above, in the present embodiment, the deepest part is formed by providing a step at the bottom of the oil sump 4, and the oil suction port 10 is provided directly above the deepest part of the oil sump 4. Even when the oil 5 is pressed against the wall surface in the sealed container 6 by the centrifugal force due to the rotation of the shaft 1, the oil can be stably supplied to the bearing portion 9 of the crankshaft 1 and the sliding portion of the compression mechanism 7 during operation. It becomes possible.

(Embodiment 2)
FIG. 2 is a longitudinal sectional view of a hermetic compressor according to the second embodiment of the present invention.

  As shown in FIG. 2, an inclination is provided at the step portion at the bottom of the oil sump 4 toward the deepest portion. According to this configuration, since the flow of the oil 5 to the deepest part of the bottom of the oil sump 4 can be promoted, the oil 5 is more stably supplied to the bearing portion 9 of the crankshaft 1 and the sliding portion of the compression mechanism 7 during operation. It becomes possible to do.

(Embodiment 3)
FIG. 3 shows a longitudinal sectional view of a hermetic compressor according to Embodiment 3 of the present invention.

  As shown in FIG. 3, a block 26 is provided at the bottom of the oil sump 4. According to this configuration, since the oil level of the oil 5 can be raised by installing the block 26, the amount of oil filling can be reduced, and the oil suction port 10 is provided directly above the deepest part of the block 26. Even when the oil 5 is pressed against the wall surface in the sealed container 6 by the centrifugal force generated by the rotation of the crankshaft 1, the oil is stably supplied to the bearing portion 9 of the crankshaft 1 and the sliding portion of the compression mechanism 7 during operation. It becomes possible.

(Embodiment 4)
FIG. 4 shows a longitudinal sectional view of a hermetic compressor according to Embodiment 4 of the present invention.

  As shown in FIG. 4, the stepped portion of the block is inclined toward the deepest part. According to this configuration, the flow of the oil 5 into the deepest portion of the block 26 can be promoted, and the oil 5 can be supplied more stably to the bearing portion 9 of the crankshaft 1 and the sliding portion of the compression mechanism 7 during operation. It becomes possible. Further, since the block 26 is made of a magnet, it can be easily fixed to the oil sump 4 by a magnetic force, and fine foreign matters such as iron powder existing in the oil 5 can be adsorbed. It is possible to stably supply oil with less danger.

  As described above, the hermetic compressor according to the present invention can prevent a shortage of oil supplied to the bearing portion of the crankshaft and the sliding portion of the compression mechanism. It can also be applied to other uses.

1 is a longitudinal sectional view of a hermetic compressor according to Embodiment 1 of the present invention. Vertical sectional view of a hermetic compressor according to Embodiment 2 of the present invention Vertical sectional view of a hermetic compressor according to Embodiment 3 of the present invention Vertical sectional view of a hermetic compressor according to Embodiment 4 of the present invention Vertical section of a conventional hermetic compressor

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Crankshaft 2 Partition plate 3 Oil return hole 4 Oil reservoir 5 Oil 6 Sealed container 7 Compression mechanism 8 Electric motor 8a Rotor 8b Stator 9 Bearing part 10 Oil inlet 11 Refrigerant gas 12 Discharge port 13 Muffler 14 Discharge chamber 15 in container Compression mechanism communication path 16 Communication path 17 Rotor upper chamber 18 Rotor passage 19 Rotor lower chamber 20 Motor lower chamber 21 Stator passage 22 Stator upper chamber 23 Compression mechanism ascending communication path 24 Compression mechanism upper chamber 25 External discharge port 26 block

Claims (6)

A compression mechanism and an electric motor are arranged in an airtight container having an oil sump at the bottom, a crankshaft that transmits the rotational force of the electric motor to the compression mechanism, and oil in the oil sump for the bearing portion of the crankshaft and the compression A hermetic compressor having an oil suction port for supplying to a sliding portion of a mechanism, wherein a deepest portion is formed by providing a step at a bottom portion of the oil reservoir, and the oil suction port is a deepest portion of the oil reservoir. A hermetic compressor characterized by being provided directly above. 2. The hermetic compressor according to claim 1, wherein an inclination is provided toward a deepest portion at a step portion of the oil sump bottom. A compression mechanism and an electric motor are arranged in an airtight container having an oil sump at the bottom, a crankshaft that transmits the rotational force of the electric motor to the compression mechanism, and oil in the oil sump for the bearing portion of the crankshaft and the compression A hermetic compressor having an oil suction port for supplying to a sliding portion of a mechanism, wherein a block having a step is installed at the bottom of the oil reservoir, and the oil suction port is a deepest portion of the block step portion. A hermetic compressor characterized by being provided directly above. The hermetic compressor according to claim 3, wherein an inclination is provided toward a deepest portion at a step portion of the block. The hermetic compressor according to claim 3 or 4, wherein a material of the block is a magnet. The hermetic compressor according to any one of claims 1 to 5, wherein the working fluid uses CO ₂ which is a high-pressure refrigerant.

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