JP2010121547A - Hermetic compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To discharge gas sufficiently separated into gas and liquid through an external discharge pipe 39 by substantially restricting and treating a refrigerant 27 and oil 6. <P>SOLUTION: A pipe 5 is provided from the lower section of an electric motor 3 to the upper section of a sealed vessel 1, and the upper and lower sections of the sealed vessel 1 are completely partitioned. Thereby, the refrigerant 27 is allowed to pass through only the inside of a pipe 5, and the oil 6 is prevented from being discharged outside of the sealed vessel 1 through the inner wall of the sealed vessel 1. Accordingly, the oil 6 scattered on the wall surface of the sealed vessel 1 falls into an oil sump 20 provided below the sealed vessel 1 without being collected and grown to an oil droplet and reaching an external discharge port 39, and only the refrigerant 27 is discharged outside of the sealed vessel 1. <P>COPYRIGHT: (C)2010,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. 2, 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 out of the sealed 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 in contact with the oil and entrains it, and when the gas is supplied from the sealed container 1 to the refrigeration cycle, the oil is brought in, and the 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.
JP-A-7-189963

  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.

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 hermetic compressor having a basic structure including a shaft and an oil supply mechanism that supplies oil in an oil reservoir provided in a lower portion of the sealed container to a bearing portion and a compression mechanism sliding portion of the crankshaft through the crankshaft It is about.

  In order to achieve the above object, the hermetic compressor of FIG. 1 is configured such that the gas discharged from the compression mechanism communicates with the discharge chamber in the container above the compression mechanism and from the discharge chamber in the container to the lower portion of the compression mechanism. Through the compression mechanism communication path, the communication path from the compression mechanism communication path to the rotor upper chamber, the rotor passage provided in the rotor so that the rotor upper chamber communicates with the rotor lower chamber, and the rotor lower chamber in order. Goes under the motor and passes through the stator or the stator passage provided between the stator and the hermetic container so that the lower part and the upper part of the stator communicate with each other. After that, a gas passage in the container that allows the gas to be discharged out of the sealed container through an external discharge port provided in a portion above the position of the upper chamber of the sealed container is sufficiently gas-liquid separated. To discharge the airtight container from the bottom of the motor Part installed pipes to, by the refrigerant gas passes through only the internal pipe, is obtained by preventing the oil along the sealed container inner wall is discharged to the outside of the sealed container.

  The pipe is provided from the lower part of the electric motor to the upper part of the sealed container, and further, the upper and lower parts of the sealed container are completely partitioned, so that the refrigerant passes only inside the pipe, and the oil passes through the inner wall of the sealed container and the oil is outside the sealed container. By preventing the oil from being discharged to the oil, the oil that tried to go outside the sealed container through the inner wall surface of the sealed container is completely separated from the upper part and the lower part of the sealed container, and is thus scattered on the wall surface of the sealed container The oil aggregates and grows into oil droplets and falls into an oil reservoir provided in the lower part of the sealed container without reaching the external discharge port. Thereby, 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 accompanied, the pipe is provided from the lower part of the electric motor to the upper part of the closed container, and further, the upper and lower parts of the closed container are completely partitioned, so that the refrigerant passes only inside the pipe, and the inner wall surface of the closed container is The oil to be transmitted cannot be transmitted to the upper part of the sealed container even if the oil is transmitted through the wall surface, and is not discharged outside the sealed container, and only the refrigerant is discharged outside the sealed container. .

  According to the present invention, the discharge gas from the compression mechanism 2 and the oil that is transmitted along the compression mechanism 2 that accompanies the compression mechanism and the inner wall surface of the sealed container 1 after being supplied to the bearing 66 are substantially restrained. Handling, the pipe 5 is provided from the lower part of the electric motor 3 to the upper part in the sealed container 1, and further, the upper part and the lower part are completely partitioned in the sealed container 1 so that the refrigerant gas 27 passes only inside the pipe 5. By preventing the oil 6 from being discharged out of the sealed container 1 through the inner wall of the container 1, even if the oil 6 travels through the wall surface of the sealed container 1, it cannot reach the upper part of the sealed container 1. Therefore, only the refrigerant gas 27 from which the oil 6 has been sufficiently separated can be discharged and supplied to the outside of the sealed container 1.

  According to a second aspect of the present invention, the pipe 5 can be provided easily by providing it with a copper pipe.

  According to the third aspect, by providing the pipe 5 with a plurality of pipes, it is possible to prevent the oil 6 from being discharged without increasing the flow path resistance of the refrigerant.

  According to the fourth aspect of the present invention, the method of completely partitioning the upper and lower parts of the sealed container 1 can be easily performed by removing the gap between the contact portions of the compression mechanism part 2 and the sealed container 1 so that the sealed container 1 can be easily separated from the upper part. Can be completely partitioned at the bottom.

  According to the fifth aspect of the present invention, the method of completely partitioning the upper part and the lower part of the sealed container 1 can be achieved by removing the gap between the contact portions of the bearing portion 66 and the sealed container 1 so that the sealed container 1 can be easily separated into the upper part and the lower part. Can be completely partitioned.

  According to the sixth aspect of the present invention, when oil having a high viscosity used when the refrigerant is carbon dioxide is used, the oil 6 adhering to the inner wall of the hermetic container 1 passes along the inner wall of the hermetic container 1 as it is. Although it is easy to be discharged outside, the upper and lower parts of the sealed container 1 are completely partitioned, so that it is not discharged outside the sealed container, and only the refrigerant gas 27 from which the oil 6 has been sufficiently separated is discharged out of the sealed container 1. Can be supplied.

  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 orbit to move in a circular orbit is provided, and the orbiting scroll 13 is moved in an orbit by driving the orbiting scroll 13 eccentrically by the main shaft portion 4a at the upper end of the crankshaft 4. 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 central portion. , The refrigerant gas 27 is sucked from the suction pipe 16 communicating with the outside of the sealed container 1 and the suction port 17 in 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 However, a pipe is installed from the lower part of the electric motor to the upper part of the sealed container as shown in FIG. 1 so that the oil 6 traveling on the inner wall surface of the sealed container 1 is not discharged out of the sealed container 1 as it is. Completely separate the top and bottom.

  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. Although the oil 6 is discharged outside, the oil 6 that tries to move up the inner wall surface of the hermetic container 1 by completely partitioning the hermetic container 1 into an upper part and a lower part cannot go to the upper part of the hermetic container 1. Only the refrigerant gas 27 is discharged from the external discharge pipe 39 to the outside of the sealed container 1.

  By completely partitioning the hermetic container 1 into an upper part and a lower part, the oil 6 aggregates from the scattered state and grows into oil droplets, drops along the inner wall of the hermetic container 1, drops into the lower oil reservoir 20, and rides on the refrigerant gas 27. Since the recovery is performed with almost no opportunity, the oil 6 accompanying the refrigerant gas 27 can be efficiently separated and recovered.

  The refrigerant gas 27 from which the oil 6 has been separated as described above is provided in the outside of the portion of the sealed container 1 beyond the position of the stator upper chamber 38 by providing the pipe 5 from the lower part of the motor 3 to the upper part of the sealed container 1. Since the oil is discharged from the discharge pipe 39 to the outside of the closed container 1, the oil 6 is discharged to the outside of the closed container 1 without being in contact with the refrigerant gas 27 accompanying the oil 6 and supplied to the refrigeration cycle. can do. Therefore, 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.

This embodiment is an example of a closed type 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 the hermetic compressor which concerns on embodiment 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 5 Pipe 6 Oil 7 Oil supply mechanism 12 Fixed scroll 13 Orbiting scroll 14 Rotation restriction mechanism 15 Compression chamber 16 Intake pipe 17 Inlet 18 Outlet 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 Rotor upper chamber 34 Communication path 35 Rotor lower chamber 36 Rotor passage 37 Stator passage 38 Stator upper portion Chamber 39 External discharge pipe 66 Bearing section

Claims (6)

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 that supplies the oil in the oil reservoir provided to the crankshaft bearing part and compression mechanism sliding part through the crankshaft. Pipes are installed from the lower part of the motor to the upper part of the sealed container. Is a hermetic compressor that prevents the oil from being discharged outside the hermetic container along the inner wall of the hermetic container by allowing the refrigerant to pass only inside the pipe. 2. The hermetic compressor according to claim 1, wherein the pipe provided in the hermetic container is a copper pipe. 3. The hermetic compressor according to claim 1, wherein a plurality of pipes are provided in the hermetic container. By eliminating the gap between the contact part between the compression mechanism and the sealed container, the upper and lower parts of the sealed container are completely partitioned so that the refrigerant passes only inside the pipe. The hermetic compressor according to claim 1, wherein the hermetic compressor is prevented from being discharged. By eliminating the gap between the contact part of the bearing and the sealed container, the upper and lower parts of the sealed container are completely partitioned so that the refrigerant only passes through the inside of the pipe. The hermetic compressor according to any one of claims 1 to 3, wherein discharge is prevented. 6. The hermetic compressor according to claim 1, wherein a carbon dioxide refrigerant is used and an oil having a viscosity of 60 m ² / S or more is used.