JP2009030464A - Hermetic compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To sufficiently deliver gas-liquid separated gas from an external delivery pipe 39, by substantially restricting and treating a refrigerant 27 and oil 6. <P>SOLUTION: Refrigerant gas 27 including the oil 6 is delivered from a delivery port 18, and passes through a stator passage 37 after passing through a rotor passage 36, and is delivered outside a sealed vessel 1 by passing through the external delivery pipe 39 arranged in a part above a position of a stator upper chamber 38 of a sealed vessel 1 after passing through to the stator upper chamber 38 on the outer periphery of a connecting passage 34, but the refrigerant gas 27 including the oil 6 collides with a gas-liquid separating collision wall 100 by arranging the gas-liquid separating collision wall 100 on the periphery of the external delivery pipe 39 as Fig. 1 so that the refrigerant gas 27 including the oil 6 is not delivered as it is outside the sealed vessel 1, and the oil 6 sticks to the gas-liquid separating collision wall 100, and only the refrigerant gas 27 is delivered outside the sealed vessel 1, and gas-liquid is efficiently separated. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a hermetic compressor used for refrigeration air conditioning hot water supply for business use, home use, or vehicle use, or a refrigerator.

  Conventionally, as shown in FIG. 4, this type of hermetic compressor includes a compression mechanism 2 in a hermetic container 1, an electric motor 3 for driving the compression mechanism 2 provided below the compression mechanism 2, and the electric motor 3 and a crankshaft 4 for transmitting the rotational force 3 to the compression mechanism 2, and the oil 6 of the oil sump 20 provided at the lower part in the sealed container 1 is passed through the crankshaft 4 to the bearing portion 66 of the crankshaft 4 and the compression mechanism. And an oil supply mechanism 7 that supplies the two sliding portions.

  As a result, the oil 6 is forcibly supplied to the bearing 66 and the sliding portion of the compression mechanism 2 against the gravity by the oil supply mechanism 7, and the refrigerant gas compressed by the compression mechanism 2 is sealed in a sealed container while ensuring smooth operation. After the motor 3 is cooled through the portion of the motor 3 in 1, the oil is discharged to the outside of the hermetic container 1, and the oil after being supplied to the sliding portion of the bearing portion 66 and the compression mechanism 2 is supplied by supply pressure or gravity. It can move downward and be naturally recovered in the oil sump 20. However, the refrigerant gas always comes into contact with the oil and accompanies it, and when it is supplied from the sealed container 1 to the refrigeration cycle, the oil is taken out, and piping pressure loss in the refrigeration cycle, condensers, evaporators, etc. There exists a problem which brings about the fall of the heat exchange efficiency in a heat 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. It is designed so that separation occurs repeatedly, and it is devised so that oil does not accompany the refrigerant gas discharged outside the sealed container, or as disclosed in Patent Document 1, from the bearing part or the compression mechanism to the motor part. An oil discharge path is provided independently from the flow path of the refrigerant discharged from the compression mechanism to the electric motor section, and the discharged oil is dropped on the stator of the electric motor and then collected in the lower oil sump by passing down. On the other hand, the refrigerant gas is discharged toward one side of the motor part, descends on one side passage between the stator and the sealed container and reaches the lower part of the motor, and then air between the stator and the rotor. The gap is raised and sealed Creating a flow of orderly refrigerant discharged to the outside so that to hard to entrain oil falling Tsutai dropwise.
Japanese Patent Laid-Open No. 7-189963 (1-7, FIGS. 1, 2, 3, 4 and 5)

  However, none of the conventional methods has achieved satisfactory gas-liquid separation. The conventional system does not completely restrict the flow of the refrigerant gas or oil, and does not sufficiently prevent the oil from being mixed into the refrigerant gas discharged out of the hermetic container due to insufficient collision and turning.

  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.

  A hermetic compressor of the present invention includes a compression mechanism in a hermetic container, an electric motor provided below the compression mechanism for driving the compression mechanism, a crankshaft for transmitting the rotational force of the electric motor to the compression mechanism, A hermetic compressor having an oil supply mechanism that supplies oil in an oil reservoir provided at a lower portion in a sealed container to a bearing portion of the crankshaft and a compression mechanism sliding portion through the crankshaft, and is discharged from the compression mechanism. Gas in the container above the compression mechanism, a compression mechanism communication path communicating from the discharge chamber in the container to the lower part of the compression mechanism, a communication path extending from the compression mechanism communication path to the rotor upper chamber, rotation with the rotor upper chamber The rotor passage provided in the rotor so as to communicate with the lower part of the rotor, the lower part of the rotor, and the lower part of the stator are sequentially passed to the motor, and the stator or the stator is hermetically sealed so that the lower part and the upper part of the stator are communicated. Between the container and After passing through the stator passage to the stator upper chamber around the outside of the communication path, it is discharged out of the sealed container through an external discharge port provided in a portion of the sealed container above the position of the stator upper chamber. An in-container gas passage is provided.

  In the present invention, a gas-liquid separation collision wall is provided around the external discharge port at the top or side of the sealed container in order to discharge the gas and liquid sufficiently separated by handling the refrigerant and oil almost in a restricted manner. Provided that the refrigerant hits the gas-liquid separation collision wall so that the oil and the refrigerant collide with each other, and the oil that has traveled along the inner wall of the sealed container is prevented from being discharged out of the sealed container by the gas-liquid separation collision wall. It is characterized by that.

  The gas-liquid separation collision wall provided around the external discharge port causes the discharged mixed gas of refrigerant and oil to collide with the gas-liquid separation collision wall before passing through the external discharge port. At this time, the gas is separated by the gas-liquid separation collision wall and serves as an oil separator. The refrigerant and the oil are separated from each other, and only the refrigerant is discharged out of the sealed container.

  By restricting and handling the gas discharged from the compression mechanism in this way, the gas discharged from the compression mechanism comes into contact with the oil supplied to them while passing through the compression mechanism and around the bearing portion. Even if it is accompanied, by providing a gas-liquid separation collision wall around the external discharge port, the mixed gas of refrigerant and oil collides with the gas-liquid separation collision wall, and the refrigerant and oil are separated into gas and liquid and sealed. Only the refrigerant is discharged out of the container.

  According to the present invention, the gas discharged from the compression mechanism and the compression mechanism that accompanies it and the oil that has been supplied to the bearing portion are substantially restrained and handled, and by providing a collision wall for gas-liquid separation, The refrigerant gas containing oil collides with the collision wall for gas-liquid separation, and the oil adheres to the collision wall for gas-liquid separation and performs gas-liquid separation, and only the refrigerant gas that has sufficiently separated the oil is discharged out of the sealed container. can do.

  In addition, since the external discharge pipe is expanded in a sealed container, the function of the gas-liquid separation collision wall can be achieved at low cost.

  In addition, when high viscosity oil used when the refrigerant is CO2 is used, the oil adhering to the inner wall of the hermetic container is directly discharged to the outside of the hermetic container along the inner wall of the hermetic container. By providing a gas-liquid separation collision wall around the oil, the oil that has risen along the inner wall of the hermetic container falls along the gas-liquid separation collision wall to the upper part of the hermetic discharge chamber. As a result, only the refrigerant gas from which the oil has been sufficiently separated can be discharged out of the sealed container.

  Hereinafter, a hermetic compressor and a gas-liquid separation and discharge method thereof according to an embodiment of the present invention will be described with reference to the drawings 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 types of compression mechanisms such as a rotary compression mechanism, as well as the gas built in the sealed container together with the electric motor that drives the compression mechanism, are compressed. 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 category 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 27 is sucked from the suction pipe 16 communicating with the outside of the hermetic container 1 and the suction port 17 on the outer peripheral portion of the fixed scroll 12 and compressed, and the refrigerant gas that exceeds the predetermined pressure is fixed to the fixed scroll. The reed valve 19 is pushed open from the discharge port 18 at the center of 12 and discharged into the sealed container 1 repeatedly.

  The lower end of the crankshaft 4 reaches an oil sump 20 at the lower end of the sealed container 1 and is supported by a secondary bearing 21 fixed by welding or shrink fitting in the sealed container 1 so that it can rotate stably. The electric motor 3 is located between the main bearing member 11 and the auxiliary bearing 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. The balance weights 23 and 24 fixed by the 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 rotate stably. Thus, the orbiting scroll 13 can be stably moved in a circular orbit.

  The oil supply mechanism 7 is driven by a pump 25 driven at the lower end of the crankshaft 4, and the oil 6 in the oil reservoir 20 is passed through the oil supply hole 26 passing through the crankshaft 4 and the bearing portions 66 and the compression mechanisms of the respective parts of the compression mechanism 2. 2 is supplied to each sliding part. The supplied oil 6 flows out and drops below the main bearing member 11 through the bearing portion 66 so as to obtain a clearance by supply pressure or gravity, and is finally collected in the oil sump 20.

  However, actually, as already described, the refrigerant gas 27 indicated by the broken line arrow in FIG. 1 discharged from the compression mechanism 2 is accompanied by the oil 6 that has contacted within the compression mechanism 2, or the main bearing member 11. There is a problem that the supplied oil 6 that is dripped down is scattered and accompanied, and the oil cannot be sufficiently separated conventionally and the oil is discharged together with the refrigerant gas discharged outside the sealed container 1.

  In the embodiment shown in FIG. 1, in order to solve such a problem, the refrigerant gas 27 discharged from the compression mechanism 2 is compressed into the container discharge chamber 31 above the compression mechanism 2 and the container discharge chamber 31. A compression mechanism communication path 32 for communicating the lower part of the mechanism 2, a communication path 34 continuing from the compression mechanism communication path 32 to the rotor upper chamber 33, and the rotor 3 b so as to communicate the rotor upper chamber 33 and the rotor lower chamber 35. Between the stator 3a or the stator 3a and the hermetic container 1 so that the lower part and the upper part of the stator 3a are further communicated with each other through the rotor passage 36 and the rotor lower chamber 35 that are provided in After passing through a stator passage 37 provided between them and passing through the stator upper chamber 38 around the outside of the communication path 34, an external discharge pipe 39 provided in a portion of the hermetic container 1 beyond the position of the stator upper chamber 38. Through the sealed container 1 It is, but as the refrigerant gas 27 containing oil 6 is not directly discharged into the sealed container 1 outside provided gas-liquid separation deflector 100 around the outside discharge pipe 39 as in FIG. 1.

  After passing through the rotor passage 36, the refrigerant gas 27 containing the oil 6 passes through the stator passage 37, and is sealed from an external discharge pipe 39 located at a position above the stator upper chamber 38 around the outside of the communication path 34. 1, the gas-liquid separation collision wall 100 is provided around the external discharge pipe 39 so that the refrigerant gas 27 containing the oil 6 collides with the gas-liquid separation collision wall 100, and the oil 6 Only the refrigerant gas 27 adhering to the liquid separation collision wall 100 is discharged out of the sealed container 1 from the external discharge pipe 39.

  The oil 6 that has been gas-liquid separated and adhered to the gas-liquid separation collision wall 100 aggregates from the mist state and grows into oil droplets and drops on the inner wall of the sealed container 1 and the sub-bearing 21 to the oil reservoir 20 below. Since the refrigerant gas 27 is collected with almost no opportunity to ride, the oil 6 accompanying the refrigerant gas 27 can be separated and collected efficiently.

  The refrigerant gas 27 from which the oil 6 has been separated as described above is discharged from the external discharge pipe 39 outside the position of the stator upper chamber 38 of the closed container 1 to the outside of the closed container 1. The oil can be discharged out of the sealed container 1 and supplied to the refrigeration cycle in a state where the oil is sufficiently separated without coming into contact with the refrigerant gas 27. Accordingly, it is possible to prevent a pipe pressure loss in the refrigeration cycle and a decrease in heat exchange efficiency in a heat exchanger such as a condenser or an evaporator.

(Embodiment 2)
FIG. 2 shows that by providing a protrusion on the external discharge pipe 39 side of the gas-liquid separation collision wall 100 of the first embodiment, the number of collision separations of the refrigerant gas 27 containing the oil 6 is increased, and the gas-liquid separation effect is further increased. Can be expected.

(Embodiment 3)
In FIG. 3, when the external discharge pipe 39 is expanded in the sealed container 1, the same function as the gas-liquid separation collision wall can be made inexpensively.

  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 types of compression mechanisms such as a rotary compression mechanism, as well as the gas built in the sealed container together with the electric motor that drives the compression mechanism, are compressed. 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 category of the present invention.

Sectional drawing which shows one closed type compressor which concerns on embodiment of this invention Sectional drawing which shows Embodiment 2 of this invention Sectional drawing which shows Embodiment 3 of this invention Sectional view showing a conventional example

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Airtight container 2 Compression mechanism 3 Electric motor 3a Stator 3b Rotor 4 Crankshaft 4a Main shaft part 6 Oil 7 Oil supply mechanism 12 Fixed scroll 13 Orbiting scroll 14 Rotation restriction mechanism 15 Compression chamber 16 Suction pipe 17 Suction port 18 Discharge port 20 Oil reservoir 21 Sub-bearing 23 Balance weight 24 Balance weight 25 Pump 26 Oil supply hole 27 Refrigerant gas 31 Discharge chamber in container 33 Upper rotor chamber 34 Communication path 35 Rotor lower chamber 36 Rotor passage 37 Stator passage 38 Stator upper chamber 39 External discharge pipe 66 Bearing 100 Collision wall for gas-liquid separation

Claims (4)

A scroll compression mechanism in the hermetic 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 hermetic container And an oil supply mechanism for supplying the oil in the oil reservoir provided in the crankshaft through the crankshaft to the bearing portion of the crankshaft and the sliding portion of the compression mechanism. So that the oil hits the gas-liquid separation collision wall so that the oil and the refrigerant collide with each other, and the oil-gas-liquid separation collision wall that has traveled along the inner wall of the sealed container prevents the oil from being discharged outside the sealed container. A hermetic compressor characterized in that In the hermetic compressor according to claim 1, by providing a projection on the external discharge pipe side of the gas-liquid separation collision wall, the number of collision separations of oil and refrigerant is increased, so that the oil is not discharged outside the sealed container. A hermetic compressor characterized by that. The hermetic compressor according to claim 1, wherein the external discharge pipe is expanded in a hermetic container, and the gas-liquid separation collision can be provided at low cost by acting as a gas-liquid separation collision wall. A hermetic compressor characterized by In hermetic compressor according to any one of claims 1 to 3, a hermetic compressor, characterized in that use oil 60 m 2 / ^S or more viscosity using a CO2 refrigerant.

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