JP2009103030A - Hermetic compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hermetic compressor which handles coolant and oil in substantially constrained manner, and discharges a gas in which a gas and a liquid are sufficiently separated. <P>SOLUTION: A refrigerant separated from unliquified mist of oil is led to a stator upper chamber 33 around the outside of a restriction area from a motor lower chamber through a stator or a stator passage between the stator and a hermetic vessel. The mist of oil is liquified by a circular-shaped collision plate oil separator 28 provided at an inner wall side of a hermetic container 1 of the space portion, and is dropped into an oil reservoir by its own weight from a space of the hermetic vessel through spaces of the stator passage 37, the hermetic vessel 1 and the stator 3a. The coolant gas is discharged to the outside the hermetic container in an upper part of the stator upper chamber, and thus the coolant gas subjected to vapor-liquid separation from oil is discharged. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a hermetic compressor used in the field of refrigeration and air conditioning.

  Conventionally, this type of hermetic compressor includes a compression mechanism in a hermetic container, an electric motor for driving the compression mechanism provided below the compression mechanism, and a crank for transmitting the rotational force of the electric motor to the compression mechanism. And an oil supply mechanism that supplies oil in an oil reservoir provided at a lower portion in the sealed container to a bearing portion of the crankshaft and a sliding portion of the compression mechanism through the crankshaft.

  As a result, the oil is forcibly supplied to the sliding portion of the bearing portion and the compression mechanism against the gravity by the oil supply mechanism, and the refrigerant gas compressed by the compression mechanism is part of the motor in the sealed container while ensuring a smooth operation. After the motor is cooled, the oil is discharged out of the sealed container, and the oil supplied to the bearing part and the sliding part of the compression mechanism moves downward by the supply pressure and gravity and is naturally recovered in the oil reservoir. Can be. However, the refrigerant gas always comes in contact with oil and entrains it, bringing in oil when it is supplied from the sealed container to the refrigeration cycle, and pipe pressure loss in the refrigeration cycle and heat from condensers, evaporators, etc. There is a problem that causes a reduction in heat exchange efficiency in the exchanger.

In order to solve this problem, conventionally, the refrigerant gas discharged from the compression mechanism into the sealed container passes through the electric motor until it is discharged to the outside of the sealed container while cooling it. Designed so that separation occurs repeatedly so that the oil does not accompany the refrigerant gas discharged outside the sealed container, or the oil discharged from the bearing and compression mechanism merges with the refrigerant discharged from the compression mechanism After passing through the rotor of the rear motor and dropping at the lower part, it is collected in the oil sump at the lower part by passing down, while the separated refrigerant gas flows between the stator and the sealed container. An orderly refrigerant flow that is discharged to the outside of the hermetic container is created by raising the passage between them so as to make it difficult to accompany the oil that drops and propagates (see, for example, Patent Document 1).
JP-A-7-189963

  However, none of the conventional methods has achieved satisfactory gas-liquid separation. The conventional method of performing collision separation and centrifugal separation by the flow of refrigerant gas regulates the flow of refrigerant gas by providing a refrigerant passage provided in the compression mechanism or the stator of the electric motor, and collides with each part, rotor and balance weight. However, the flow of refrigerant gas and oil cannot be constrained and collision and swirl are insufficient. It is not easy to prevent the oil from being mixed into the refrigerant gas discharged out of the hermetic container because it is easily contacted with repeated contact.

  In addition, in the one disclosed in Patent Document 1, the oil discharged from the bearing portion and the compression mechanism is dropped by merging with the refrigerant discharged from the compression mechanism, passing through the rotor of the electric motor, and being centrifuged at the lower part. The separated refrigerant gas rises up the passage between the stator and the hermetic container and is discharged out of the hermetic container while being collected in the lower oil sump. The oil is made difficult to accompany the oil that drops and propagates. However, since the oil is dispersed by the refrigerant gas and accompanies the flow, the refrigerant gas discharged outside the sealed container is also used. The oil has not been prevented from entering.

  An object of the present invention is to provide a hermetic compressor and a gas-liquid separation / discharge method capable of discharging gas sufficiently separated into gas and liquid by handling the refrigerant and oil almost constrained.

  The hermetic compressor of the present invention includes a compression mechanism in a hermetic container, an electric motor for driving the compression mechanism provided below the compression mechanism, and a crank for transmitting the rotational force of the electric motor to the compression mechanism unit. A gas discharged from the compression mechanism into the sealed container is provided with a shaft and an oil supply mechanism that supplies oil in an oil reservoir provided in a lower portion of the sealed container to the bearing portion of the crankshaft and the sliding portion of the compression mechanism through the crankshaft. In addition, the oil after being supplied to the compression mechanism and its bearing portion is almost restrained and guided from the rotor upper chamber through the rotor passage to the rotor lower chamber to be subjected to forced swirling by the rotation of the rotor, thereby Centrifugation is performed, and the liquefied oil adheres to the coil end of the stator and is dropped into the oil reservoir in the lower part. A circular collision plate installed on the inner wall side of the hermetic container in the space portion thereof, which is guided to the stator upper chamber outside the restraint area through a stator passage between the stator or the stator and the hermetic container The mist-like oil is liquefied by the oil separator, and the space of the stator passage, the sealed container, and the stator is dropped from the space portion of the sealed container to the oil sump due to the falling weight of the oil. It is characterized in that the refrigerant gas separated from oil and gas-liquid is discharged from the portion above the position to the outside of the sealed container.

  According to the present invention, the gas discharged from the compression mechanism and the accompanying compression mechanism and the oil after being supplied to the bearing portion thereof are substantially restrained and handled, and the rotor rotates by passing through the rotor passage. After centrifuging efficiently with a strong centrifuge, the liquefied oil is applied to the coil end of the stator to catch the oil and let it drop into the oil reservoir. It is liquefied by colliding with an oil separator, which is a circular collision plate installed on the stator on the inner wall, and dropped into the oil reservoir to discharge and supply gas that has been sufficiently gas-liquid separated to the outside of the sealed container. be able to.

  Hereinafter, a hermetic compressor according to an embodiment of the present invention and a gas-liquid separation and discharge method thereof will be described with reference to FIG. 1 for understanding of the present invention.

  This embodiment is an example of a case of a hermetic compressor for a refrigeration cycle incorporating a vertical scroll-type compression mechanism, and a compression target is a refrigerant gas. However, the present invention is not limited to this, and various compression mechanisms such as a rotary compression mechanism are compressed with respect to general gas contained in a sealed container together with an electric motor that drives the compression mechanism. A hermetic compressor that divides the upper and lower parts and accommodates an electric motor in the lower part is effective when applied to all of them and belongs to the scope of the present invention.

(Embodiment 1)
As shown in FIG. 1, the hermetic compressor according to the present embodiment includes a main bearing member 11 of a crankshaft 4 fixed by welding or shrink fitting in the hermetic container 1, and bolts on the main bearing member 11. The scroll type compression mechanism 2 is configured by sandwiching the orbiting scroll 13 meshing with the fixed scroll 12 between the fixed scroll 12 and the rotation of the orbiting scroll 13 between the orbiting scroll 13 and the main bearing member 11. A rotation restricting mechanism 14 such as an Oldham ring that guides the circular scroll to move is provided, and the orbiting scroll 13 is eccentrically driven by the main shaft portion 4a at the upper end of the crankshaft 4, thereby causing the orbiting scroll 13 to move circularly. As a result, the compression chamber 15 formed between the fixed scroll 12 and the orbiting scroll 13 becomes smaller while moving from the outer peripheral side to the center portion. The refrigerant gas that has become a predetermined pressure or higher as the refrigerant gas is compressed by sucking and compressing the refrigerant gas from the suction pipe 16 communicating with the outside of the sealed container 1 and the suction port 17 on the outer peripheral portion of the fixed scroll 12. The reed valve 19 is pushed open from the discharge port 18 at the center of the container and discharged into the sealed container 1 repeatedly.

  The lower end of the crankshaft 4 reaches the oil sump 20 at the lower end of the sealed container 1 and is supported by a secondary bearing member 21 fixed by welding or shrink fitting in the sealed container 1 and can rotate stably. The electric motor 3 is located between the main bearing member 11 and the sub-bearing member 21, and is integrally coupled to a stator 3 a fixed to the sealed container 1 by welding or shrink fitting, and an outer periphery in the middle of the crankshaft 4. Balance weights 23 and 24 fixed by pins 22 are provided on the outer peripheral portions of the upper and lower end surfaces of the rotor 3b, so that the rotor 3b and the crankshaft 4 are stabilized. By rotating, the orbiting scroll 13 can be stably moved in a circular orbit.

  The oil supply mechanism 7 includes a bearing 25 in each part of the compression mechanism 2 and a compression mechanism 2 through an oil supply hole 26 that vertically passes the oil 6 in the oil reservoir 20 by a pump 25 driven at the lower end of the crankshaft 4. To each sliding part. The supplied oil 6 flows out and drops below the main bearing member 11 through the bearing portion so as to obtain a clearance by supply pressure or gravity, and is finally collected in the oil sump 20.

  Further, the refrigerant gas discharged from the compression mechanism 2 has an in-container discharge chamber 31 in the upper part of the compression mechanism 2, a compression mechanism communication path 32 that connects the in-container discharge chamber 31 and the lower part of the compression mechanism 2, and this compression mechanism communication path. The motor passes through the communication path 34 extending from the rotor 32 to the rotor upper chamber 33, the rotor passage 36 provided in the rotor 3b so as to communicate the rotor upper chamber 33 and the rotor lower chamber 35, and the rotor lower chamber 35 sequentially. Of the communication path 34 through the stator 3a or the stator passage 37 provided between the stator 3a and the hermetic container 1 so that the lower part and the upper part of the stator 3a communicate with each other. After passing through the outer stator upper chamber 38, the inside of the container is adapted to be discharged out of the sealed container 1 through an external discharge pipe 39 provided in a portion of the sealed container 1 that is located above the position of the stator upper chamber 38. A gas passage is provided.

  The in-container discharge chamber 31 of the in-container gas passage and the compression mechanism communication passage 32 are located outside the compression mechanism 2 and its bearing portion, and collectively collect the refrigerant gas discharged from the compression mechanism 2. It discharges to the communication path 34 below the compression mechanism 2. Subsequently, the communication path 34 guides the discharged refrigerant gas to the rotor upper chamber 33 and allows the refrigerant gas to enter the rotor passage 36 in a state where the refrigerant gas swirls loosely due to the rotation of the rotor 3b and the balance weight 23 and passes downward. The oil 6 that has been liquefied toward the outside by the centrifugal separation adheres to the coil end of the stator 3a and is dropped to the oil reservoir 20 at the bottom, while it is separated from the mist-like oil and oil that have not been liquefied. The refrigerant passes through the stator 3a or the stator passage between the stator 3a and the hermetic container 1 from the lower chamber of the motor, passes through the stator upper chamber outside the restraint area and the outer passage of the compression mechanism 2, and passes through the hermetic container 1. The mist-like oil guided to the upper part collides with the oil separator 28 provided on the inner wall of the hermetic container in the upper chamber and is liquefied and dripped into the oil reservoir 20 by the weight of the oil 6. Is it thus possible to increase the gas-liquid separation effect of the oil 6.

  As described above, the hermetic compressor according to the present invention is a hermetic type capable of suppressing the system loss by reducing the oil discharged to the system by increasing the gas-liquid separation effect with respect to the conventional hermetic compressor. A compressor can be provided.

Sectional drawing of a hermetic compressor showing an embodiment of the present invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Airtight container 2 Compression mechanism 3 Electric motor 3a Stator 3b Rotor 4 Crankshaft 6 Oil 7 Oil supply mechanism 17 Intake port 18 Discharge port 20 Oil sump 23 Balance weight 24 Balance weight 27 Refrigerant gas 28 Oil separator 31 In-vessel discharge chamber 32 Compression Mechanism communication path 33 Rotor upper chamber 34 Connecting path 35 Rotor lower chamber 36 Rotor path 37 Stator path

Claims (1)

A compression mechanism in the sealed container, an electric motor for driving the compression mechanism provided below the compression mechanism, a crankshaft for transmitting the rotational force of the electric motor to the compression mechanism, and a lower part in the sealed container A gas-liquid separation method for a hermetic compressor including an oil supply mechanism that supplies oil in a provided oil reservoir to a bearing portion of a crankshaft and a sliding portion of a compression mechanism through a crankshaft, and from the compression mechanism to a sealed container The discharged gas, the compression mechanism, and the oil supplied to the bearing are almost restrained and guided from the rotor upper chamber to the rotor lower chamber through the rotor passage to be forcedly swung by the rotation of the rotor. Centrifugation of the gas and liquid is performed, and the liquefied oil adheres to the coil end of the stator and is dropped and dropped into the oil reservoir in the lower part. A plate that is passed through a stator passage between the stator or the stator and the airtight container, leads to the stator upper chamber around the restraint area, passes through the passage outside the compression mechanism, and is installed at the top of the compression mechanism. It is liquefied by colliding with oil that has been misted by the parts of the part, and drops from the space between the compression mechanism and the sealed container to the oil reservoir due to its own weight drop, and the refrigerant gas is located in the upper chamber of the stator of the sealed container A hermetic compressor that discharges refrigerant gas separated from oil and gas-liquid by discharging from the above portion to the outside of the hermetic container.