JP2009209807A - Compressor and expander - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To minimize delivery of lubricating oil to the outside of a sealed vessel, by restraining mixing of the lubricating oil into a working fluid, from a viewpoint of reliability and the realization of high efficiency of a refrigerating cycle, in a compressor used for the refrigerating cycle and a fluid machine such as an expander. <P>SOLUTION: This compressor can promote centrifugation of the working fluid and the lubricating oil by a swirling flow caused by rotation of a rotor 34, by lengthening a stay time on the inside of the sealed vessel 1, by preventing the working fluid and the lubricating oil delivered from a first delivery hole 32 from immediately flowing in a second delivery hole 33, by arranging a partition plate 39 between the first delivery hole 32 and the second delivery hole 33, by arranging the second delivery hole 33 delivering the working fluid outside from the inside of the sealed vessel 1 in close vicinity to the upstream side in the rotational direction of a rotor 16, to the first delivery hole 32 for delivering the working fluid inside the sealed vessel 1 from a compression mechanism part 21. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a compressor and an expander.

  Conventionally, a compressor such as a rotary type compressor is often used as a compressor for a refrigeration cycle because of its simple structure and compactness. Generally, in a fluid machine such as a compressor, lubricating oil is supplied to mechanical sliding portions of each portion in order to reduce sliding loss of pistons, cylinders, vanes and the like. Thereafter, the lubricating oil flows into the suction chamber from the minute gaps of the respective parts, is mixed in a small amount into the working fluid passing through the respective parts, and flows out into the refrigeration cycle together with the working fluid. The lubricating oil that flows out together with the working fluid flows into the condenser and the evaporator, and causes the performance of the condenser and the evaporator to deteriorate. Further, in a fluid machine such as a compressor, a shortage of lubricating oil occurs due to the outflow of lubricating oil, resulting in a decrease in efficiency and seizure. In view of this, there has been proposed a technique that can efficiently separate the working fluid and the lubricating oil in a sealed container provided with a compressor (see, for example, Patent Documents 1 and 2).

  FIG. 12 is a longitudinal sectional view of a conventional rotary compressor 120. FIG. 13 is a longitudinal sectional view of a conventional scroll compressor 130. Note that the same or corresponding components are denoted by the same reference numerals.

  As shown in FIG. 12, the conventional rotary compressor 120 includes an electric motor 2 including a rotor 16 and a stator 17, a first compression mechanism unit 3, and a second compression mechanism unit 4 inside the hermetic container 1. A multistage rotary compression mechanism 7 and a shaft 23 are provided. The electric motor 2 and the multistage rotary compression mechanism 7 are coupled to one axis by a shaft 23. An oil sump 38 is provided at the bottom of the sealed container 1.

  An intermediate discharge pipe 5 and a refrigerant introduction pipe 6 are provided on the upper part of the multistage rotary compression mechanism section 7. A discharge pipe 13, a first suction pipe 18, and a second suction pipe 19 are connected to the side portion of the compression mechanism section 7 through the sealed container 1.

  The working fluid sucked into the first compression mechanism unit 3 from the first suction pipe 18 is compressed and discharged from the intermediate discharge pipe 5 to the internal space 12 of the sealed container 1. The working fluid discharged into the internal space 12 of the sealed container 1 flows out of the refrigerant introduction pipe 6 and is sucked into the second compression mechanism unit 4 through the second suction pipe 19 and the outside of the sealed container 1. The working fluid sucked into the second compression mechanism 4 is compressed and discharged from the discharge pipe 13 to the outside of the sealed container 1.

  Lubricating oil is supplied to each sliding part of the multistage rotary compression mechanism part 7 from the oil reservoir 38 through the inside of the shaft 23 as the electric motor 2 rotates. A part of the lubricating oil supplied to each sliding part is mixed into the working fluid and discharged together with the working fluid from the discharge pipe 13 to the outside of the sealed container 1 or into the internal space 12 of the sealed container 1. After flowing out, it returns to the oil sump 38 by gravity.

  In the internal space 12 of the sealed container 1, a rotating flow is generated by the rotation of the rotor 16, and the working fluid and the lubricating oil are separated under the influence of the centrifugal force due to the rotation of the rotor 16. Specifically, the lubricating oil having a density higher than that of the working fluid is separated from the working fluid, moves to the outside in the radial direction from the center of rotation, and adheres to the inner surface of the sealed container 1. On the other hand, the working fluid separated from the lubricating oil concentrates at the center of rotation.

  In the conventional rotary compressor 120, the opening of the intermediate discharge pipe 5 is directed in the direction of rotation of the rotor 16 and in the direction of shallowly intersecting the sealed container 1 in order to smoothly separate the rotor 16 without obstructing the rotation of the rotor 16. It is configured. Further, in order to prevent the lubricating oil adhering to the inner surface of the sealed container 1 from flowing out of the sealed container 1 from the coolant introducing pipe 6, the opening of the refrigerant introducing pipe 6 projects into the internal space 12 of the sealed container 1. I am letting.

  As shown in FIG. 13, the conventional scroll compressor 130 includes an electric motor 2 including a rotor 16 and a stator 17, a scroll compression mechanism portion 9, and a shaft 23 inside the hermetic container 1. The electric motor 2 and the scroll type compression mechanism 9 are connected to one axis by a shaft 23.

  An oil reservoir 38 is provided at the bottom of the sealed container 1, and a suction pipe 8 and a discharge pipe 13 are provided through the sealed container 1 at the side of the sealed container 1. The opening 13 a of the discharge pipe 13 communicates with the internal space 12 of the sealed container 1.

  An intermediate discharge pipe 10 is provided in the upper part of the scroll type compression mechanism section 9, and a communication pipe 11 is provided in the vicinity of the outer edge thereof. A suction pipe 8 is connected to the side of the scroll type compression mechanism 9.

  The working fluid sucked into the scroll type compression mechanism 9 from the suction pipe 8 is compressed, discharged from the intermediate discharge pipe 10, and flows out to the internal space 12 of the sealed container 1 through the communication pipe 11. The working fluid that has flowed into the internal space 12 of the sealed container 1 is discharged from the discharge pipe 13 to the outside of the sealed container 1.

  Lubricating oil is supplied to each sliding part of the scroll type compression mechanism part 9 similarly to the rotary type compressor 120 described above. A part of the lubricating oil supplied to each sliding part is mixed into the working fluid and discharged together with the working fluid from the discharge pipe 13 to the outside of the sealed container 1 or into the internal space 12 of the sealed container 1. After flowing out, it returns to the oil sump 38 by gravity.

In the conventional scroll compressor 130, the lubricating oil separated from the working fluid under the influence of the centrifugal force is reduced from flowing out from the discharge pipe 13 together with the working fluid. The inner side of the stator 17 is arranged inside.
JP 2003-28683 A JP 2002-317775 A

  However, in the conventional rotary compressor 120, the refrigerant introduction pipe 6 that guides the working fluid to the outside of the hermetic container 1 is closer to the intermediate discharge pipe 5 on the downstream side in the rotation direction of the rotor 16 than the intermediate discharge pipe 5. The working fluid discharged from the intermediate discharge pipe 5 is easily discharged from the refrigerant introduction pipe 6 to the outside of the closed container 1 immediately after flowing into the internal space 12 of the closed container 1. As a result, it is not possible to secure a time for the working fluid mixed with the lubricating oil to stay in the internal space 12 of the sealed container 1, that is, a time for separating the working fluid and the lubricating oil. Are discharged to the outside of the sealed container 1 without being sufficiently separated.

  As described above, in the conventional rotary compressor 120, in order to obtain the centrifugal separation effect by the rotation of the rotor 16 in the internal space 12 of the sealed container 1, the lubricating oil and the working fluid are placed in the internal space 12 of the sealed container 1. The amount of time that is retained is also an important factor.

  Further, in the conventional scroll compressor 130, if the opening 13a of the discharge pipe 13 is arranged inside the inner diameter of the stator 17, it is difficult to secure the distance between the opening 13a of the discharge pipe 13 and the communication pipe 11. After the working fluid mixed with the lubricating oil flows into the inner space 12 of the sealed container 1, the working fluid is easily discharged from the discharge pipe 13 to the outside of the sealed container 1. As a result, the time for separating the working fluid and the lubricating oil cannot be secured, and the working fluid and the lubricating oil are discharged to the outside of the sealed container 1 without being sufficiently separated.

  The present invention has been made to solve the above-described conventional problems, and reduces the concentration of the lubricating oil in the working fluid discharged from the compressor, suppresses the performance degradation of the evaporator and the condenser, and the sealed container. An object of the present invention is to reduce the amount of lubricating oil in the inside and prevent seizure of the mechanical sliding portion, and to improve the efficiency and durability of the compressor.

  The compressor of the present invention includes a sealed container, an electric motor provided in the sealed container, a compression mechanism that is disposed below the electric motor in the sealed container, and compresses the working fluid sucked from outside the sealed container; A first discharge hole for discharging the working fluid compressed by the compression mechanism between the compression mechanism and the electric motor; an upstream side in the rotation direction of the electric motor with respect to the first discharge hole; and It is arrange | positioned between the cylinder member of the compression mechanism, and the said electric motor, and is arrange | positioned between the said 2nd discharge hole which discharges a working fluid from the said airtight container, and the said 1st discharge hole and the said 2nd discharge hole. And a partition plate.

  The expander according to the present invention includes an airtight container, an electric motor provided in the airtight container, and an expansion that is disposed below the electric motor in the airtight container and expands the working fluid sucked from outside the airtight container. A first discharge hole for discharging the working fluid expanded by the expansion mechanism between the expansion mechanism and the electric motor; and an upstream side in the rotational direction of the electric motor with respect to the first discharge hole; and It arrange | positions between the cylinder member of the said compression mechanism, and the said electric motor, It arrange | positions between the said 2nd discharge hole which discharges a working fluid from the said airtight container, and the said 1st discharge hole and the said 2nd discharge hole. And a partition plate.

  According to the compressor of the present invention, the second discharge hole for discharging the working fluid from the inside of the sealed container to the outside of the sealed container is provided to the first discharge hole for discharging the working fluid from the compression mechanism to the inside of the sealed container. By disposing the partition plate upstream in the rotation direction and installing a partition plate therebetween, the working fluid discharged from the first discharge hole is prevented from immediately flowing into the second discharge hole, and the working fluid is sealed inside the sealed container. Can be prolonged, and the centrifugal separation of the working fluid and the lubricating oil by the swirling flow generated by the rotation of the rotor of the electric motor can be promoted. As a result, the concentration of the lubricating oil in the working fluid discharged from the sealed container is reduced, the performance of the evaporator and the condenser is suppressed, the amount of lubricating oil inside the sealed container is reduced, and the mechanical sliding part is seized. Can be prevented, and the efficiency and durability of the compressor can be improved.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The same or corresponding elements are denoted by the same reference numerals, and redundant description thereof is omitted.

(Embodiment 1)
FIG. 1 is a longitudinal sectional view of a rotary compressor 100 according to Embodiment 1 of the present invention, and FIG. 2 is an enlarged detailed view of a compression mechanism portion 21 in FIG. 3 is a cross-sectional view of the compression mechanism section 21 taken along line AA in FIG. 1, and FIG. 4 is a cross-sectional view of the rotary compressor 100 taken along line BB in FIG. 5 is a cross-sectional view of the first discharge hole 32 taken along the line Y1-Y1 in FIG. 4, and FIG. 6 is a cross-sectional view of the second discharge hole 33 taken along the line Y2-Y2 in FIG. In addition, the same reference number is attached | subjected to the component which is the same as that of the conventional rotary compressor 120, or an equivalent, and description is abbreviate | omitted.

<Configuration of Rotary Compressor 100>
As shown in FIGS. 1 to 4, the rotary compressor 100 according to the first embodiment has an electric motor 2 and a compression mechanism 21 arranged in this order from the top inside the hermetic container 1 and is connected to a single axis by a shaft 23. Is made up of. An introduction terminal 35 for energizing the electric motor 2 is provided at the top of the sealed container 1, and an oil reservoir 38 for storing lubricating oil is provided at the bottom of the sealed container 1. A suction pipe 36 that guides the working fluid to the compression mechanism 21 and a discharge pipe 37 that guides the working fluid to the outside of the sealed container 1 are provided through the side of the sealed container 1.

  The electric motor 2 includes a stator 17 fixed inside the sealed container 1 and a rotor 16 fixed to the shaft 23 and rotating together with the shaft 23.

  The compression mechanism portion 21 includes a shaft 23 having an eccentric portion 23a, a cylinder 24, a piston 25, a vane 26, a spring 27, an upper bearing member 28, a lower bearing member 29, and a muffler 30. Yes.

  A piston 25 is disposed in the internal space of the cylinder 24 and is fitted to the eccentric portion 23 a of the shaft 23. Further, the vane groove 20 and the back space 41 are integrally formed in the cylinder 24, and a vane 26 and a spring 27 are disposed therein. The tip of the vane 26 is in contact with the outer peripheral surface of the piston 25 by a spring 27 disposed on the back surface of the vane 26. An upper bearing member 28 is disposed on the upper surface of the cylinder 24 and the piston 25, and a lower bearing member 29 is disposed on the lower surface. The cylinder 24, the piston 25, the upper bearing member 28, and the lower bearing member 29 form a space for sucking and compressing the working fluid, and the vane 26 partitions the suction chamber 31 and the compression chamber 50. Yes. The compression chamber 50 communicates with a communication passage 41 formed through the cylinder 24 and the lower bearing member 29.

  In the vicinity of the outer edge portion of the upper bearing member 28, a lubricating oil passage 46 is formed. A muffler 30 is installed on the lower edge of the lower bearing member 29. As a result, a muffler space 42 is formed below the lower bearing member 29. The shaft 23 is disposed through the central portion of the muffler 30, and the lower end portion of the shaft 23 is immersed in the oil reservoir 38.

  An oil path 23 c is formed inside the shaft 23, one end opening to the oil reservoir 38 and the other end opening to the sliding surface between the eccentric portion 23 a and the piston 25. An oil groove 23 b is formed on the side surface of the shaft 23. Thereby, the oil which lubricated the sliding surface of the eccentric part 23a and the piston 25 rises with rotation of the shaft 23, and lubricates the sliding surface of the shaft 23 and the upper bearing member 28.

  As shown in FIGS. 5 and 6, in the first embodiment, the first discharge hole 32 and the second discharge hole 33 pass through the upper bearing member 28 and are located downstream in the rotational direction of the rotor 16. It is arranged so as to be inclined so as to open toward each other. The first discharge hole 32 communicates with the communication passage 43 formed through the cylinder 24 and the lower bearing member 29, and the second discharge hole 33 communicates with the communication passage 45 formed in the cylinder 24. is doing.

  Further, in the first embodiment, the second discharge hole 33 is disposed on the rotation center side of the rotor 16 and on the upstream side in the rotation direction of the rotor 16 with respect to the first discharge hole 32. Further, a partition plate 39 is installed on the upper surface of the upper bearing member 28 between the first discharge hole 32 and the second discharge hole 33. The partition plate 39 is θ1 when an angle formed by a line segment connecting the center of the first discharge hole 32 and the rotation center of the rotor 34 and the base line x is θ1, and an angle formed by the second discharge hole 33 and the base line x is θ2. To θ2.

<Operation of Rotary Compressor 100>
When the stator 17 is energized through the introduction terminal 35 and the rotor 16 is rotated, the piston 25 fitted to the eccentric portion 23a of the shaft 23 performs an eccentric rotational motion. Thereby, the volume of the suction chamber 31 and the compression chamber 50 changes. That is, the volume of the suction chamber 31 increases with the eccentric rotation of the piston 25 and sucks the working fluid from the suction pipe 36. On the other hand, the volume of the compression chamber 50 decreases with the eccentric rotational movement of the piston 25 and compresses the working fluid.

  Further, along with the eccentric rotational movement of the piston 25, the lubricating oil in the oil reservoir 38 is supplied to the minute gap between the eccentric portion 23 a of the shaft 23 and the piston 25 through the oil path 23 c inside the shaft 23. The lubricating oil supplied to the minute gap between the eccentric portion 23 a of the shaft 23 and the piston 25 passes through the minute gap between the upper end surface of the piston 25 and the upper bearing member 28, and the lower end surface of the piston 25 and the lower bearing member 29. Then, it flows into the suction chamber 31 and the compression chamber 50. The lubricating oil that has flowed into the suction chamber 31 and the compression chamber 50 flows into the back space 40 through a minute gap between the vane 26 and the cylinder 24.

  In the compression chamber 50, the compressed working fluid and the lubricating oil flowing in through the minute gap are mixed and discharged to the muffler space 42 through the communication path 41. The working fluid and lubricating oil discharged to the muffler space 42 are discharged from the communication path 43 through the first discharge hole 32 to the lower space 44 below the electric motor 2. At this time, the working fluid and the lubricating oil are discharged toward the downstream side in the rotation direction of the rotor 16 due to the inclination of the first discharge hole 32.

  The working fluid and lubricating oil discharged to the lower space 44 collide with the lower portion of the electric motor 2, and then the rotational movement of the rotor 16 and the flow of the working fluid and lubricating oil sequentially discharged from the first discharge holes 32. Thus, a swirling flow is obtained. The working fluid and the lubricating oil that have turned into a swirl flow are separated by centrifugal force.

  Part of the separated lubricating oil adheres to the inner wall of the sealed container 1 or falls downward due to gravity and accumulates on the upper surface of the upper bearing member 28, and then returns to the oil reservoir 38 through the lubricating oil flow path 46. On the other hand, the separated working fluid stays in the lower space 44 as a swirling flow, and then contains the lubricating oil that has not been separated, from the second discharge hole 33, through the communication passage 45, and from the discharge pipe 37. It is discharged outside the sealed container 1. At this time, the working fluid flows smoothly into the second discharge hole 33 due to the inclination of the second discharge hole 33 and is discharged from the discharge pipe 37.

  As described above, according to the rotary compressor 100 of the first embodiment, the lower space 44 extends from the first discharge hole 32 that is inclined so as to open toward the downstream side in the rotation direction of the rotor 16. Further, the working fluid and the lubricating oil discharged to the rotor 16 are further added to the swirl flow generated by the rotation of the rotor 16, so that the separation of the working fluid and the lubricating oil by the centrifugal force can be promoted.

  Further, the second discharge hole 33 is disposed upstream of the first discharge hole 32 in the rotation direction of the rotor 16 and close to the first discharge hole 32, so that the periphery of the hermetic container 1 is The distance that the working fluid flows along the direction and the time during which the working fluid stays in the lower space 44 can be made longer. For this reason, the working fluid and the lubricating oil can be more effectively separated by the swirling flow.

  Further, by installing a partition plate 39 between the first discharge hole 32 and the second discharge hole 33, the working fluid and the lubricating oil discharged from the first discharge hole 32 are transferred to the lower space 44. Immediately after flowing in, it can be prevented from being discharged from the second discharge hole 33 to the outside of the sealed container 1. For this reason, more working fluid and lubricating oil can be retained in the lower space 44, and centrifugal separation by a swirling flow can be performed.

  Further, a large density of lubricating oil swirling in the lower space 44 is gradually present from the rotation center portion of the rotor 16 to the radial direction by the centrifugal force, that is, as it approaches the inner peripheral surface of the sealed container 1. Become. Therefore, by installing the second discharge hole 33 on the rotation center side of the rotor 16 and the upstream side in the rotation direction of the rotor 16 with respect to the first discharge hole 32, a working fluid having a lower lubricating oil concentration can be obtained. It can be discharged from the second discharge hole 33.

  Further, by arranging the opening of the second discharge hole 33 with an inclination toward the downstream side in the rotational direction of the rotor 16, the working fluid suddenly changes its direction when flowing into the second discharge hole 33. You will be forced to change. By this rapid change of direction, it is possible to obtain a centrifugal effect of further working fluid and lubricating oil.

  Therefore, according to the rotary compressor 100 in the first embodiment, the working fluid and the lubricating oil can be more effectively separated, so that the lubricating oil discharged from the discharge pipe 37 can be further reduced. it can.

  In the present embodiment, both the first discharge hole 32 and the second discharge hole 33 are inclined toward the rotation direction of the rotor 34, but both or one of them is not inclined and is upward. Even in the case of being installed, the effect of the partition plate 39, that is, the working fluid discharged from the first discharge hole 32 is discharged from the second discharge hole 33 to the outside of the sealed container 20 immediately after flowing into the lower space 44. In this case, a large amount of working fluid that has flowed into the lower space 44 from the first discharge hole 32 can be retained in the lower space 44, and the lubricating oil and the working fluid can be separated by a swirling flow. It can be done reliably.

  Further, in the present embodiment, the partition plate 39 is disposed between θ1 and θ2. However, the partition plate 39 includes θ1 to θ2, and is disposed at an angle larger than that, the operation discharged from the first discharge holes 32. The effect of preventing the fluid from flowing into the second discharge hole 33 immediately after flowing into the lower space 44 can be further increased, and more working fluid can be retained in the lower space 44. As a result, a working fluid having a lower lubricating oil concentration can be obtained.

  Further, in the present embodiment, the partition plate 39 is arranged at the intermediate position in the radial direction between the first discharge hole 32 and the second discharge hole 33, but either the first discharge hole 32 or the second discharge hole 33 is used. Even if they are arranged close to each other or integrated with the first discharge hole 32 or the second discharge hole 33, the same effect is obtained.

(Embodiment 2)
FIG. 7 is a longitudinal sectional view of the rotary compressor 110 according to the second embodiment of the present invention. 8 is a transverse sectional view of the rotary compressor 110 taken along the line CC in FIG. 7, and FIG. 9 is a longitudinal sectional view of the compression mechanism portion 60 taken along the line DD in FIG. 10 is a cross-sectional view of the first discharge hole 61 taken along the line W1-W1 of FIG. 8, and FIG. 11 is a cross-sectional view of the second discharge hole 62 taken along the line W2-W2 of FIG. The rotary compressor 110 according to the second embodiment has the same configuration as the rotary compressor 100 according to the first embodiment except for the first discharge hole 61 and the second discharge hole 62. Therefore, the same reference numerals are given to the same or corresponding components as those in the first embodiment, and the description will be omitted.

<Configuration of Rotary Compressor 110>
As shown in FIGS. 7 to 11, the first discharge hole 61 and the second discharge hole 62 in the second embodiment are both inclined so as to open toward the downstream side in the rotation direction of the rotor 16. Are arranged. The first discharge hole 61 communicates with the communication passage 43 formed through the cylinder 24 and the lower bearing member 29, and the second discharge hole 62 communicates with the communication passage 45 formed in the cylinder 24. Yes.

  Further, the second discharge hole 62 is arranged on the rotation center side of the rotor 16 and on the upstream side in the rotation direction of the rotor 16 from the first discharge hole 61. A partition plate 39 is installed on the upper surface of the upper bearing member 28 between the first discharge hole 61 and the second discharge hole 62.

  In the second embodiment, both the first discharge hole 61 and the second discharge hole 62 are disposed so as to protrude from the upper surface of the upper bearing member 28. Further, the second discharge hole 62 is disposed closer to the upper motor 2 side than the first discharge hole 61.

  The partition plate 39 is installed so that one end on the second discharge hole 62 side enters the rotation center side of the rotor 34.

<Operation of Rotary Compressor 110>
When the stator 17 is energized through the introduction terminal 35 and the rotor 16 is rotated, the piston 25 fitted to the eccentric portion 23a of the shaft 23 performs an eccentric rotational motion. Thereby, the volume of the suction chamber 31 and the compression chamber 50 changes. That is, the volume of the suction chamber 31 increases with the eccentric rotational movement of the piston 25 and sucks the working fluid from the suction pipe 36. On the other hand, the volume of the compression chamber 50 decreases with the eccentric rotational movement of the piston 25 and compresses the working fluid.

  Further, along with the eccentric rotational movement of the piston 25, the lubricating oil in the oil reservoir 38 is supplied to the minute gap between the eccentric portion 23 a of the shaft 23 and the piston 25 through the oil path 23 c inside the shaft 23. The lubricating oil supplied to the minute gap between the eccentric portion 23 a of the shaft 23 and the piston 25 passes through the minute gap between the upper end surface of the piston 25 and the upper bearing member 28, and the lower end surface of the piston 25 and the lower bearing member 29. Then, it flows into the suction chamber 31 and the compression chamber 50. The lubricating oil that has flowed into the suction chamber 31 and the compression chamber 50 flows into the back space 40 through a minute gap between the vane 26 and the cylinder 24.

  In the compression chamber 50, the compressed working fluid and the flowing lubricating oil are mixed and discharged to the muffler space 42 through the communication path 41. The working fluid and lubricating oil discharged to the muffler space 42 are discharged from the communication path 43 to the lower space 44 below the electric motor 2 through the first discharge hole 61. At this time, the working fluid and the lubricating oil are discharged toward the downstream side in the rotation direction of the rotor 16 due to the inclination of the first discharge hole 61.

  The working fluid and lubricating oil discharged to the lower space 44 collide with the lower portion of the electric motor 2 and then the rotational movement of the rotor 16 and the flow of the working fluid and lubricating oil sequentially discharged from the first discharge hole 61. Thus, a swirling flow is obtained. The working fluid and the lubricating oil that have turned into a swirl flow are separated by centrifugal force.

  Part of the separated lubricating oil adheres to the inner wall of the sealed container 1 or falls downward due to gravity and accumulates on the upper surface of the upper bearing member 28, and then returns to the oil reservoir 38 through the lubricating oil flow path 46. On the other hand, the separated working fluid stays in the lower space 44 as a swirling flow, and then contains the lubricating oil that has not been separated, and passes through the communication passage 45 from the second discharge hole 62 and from the discharge pipe 37. It is discharged outside the sealed container 1. At this time, the working fluid flows smoothly into the second discharge hole 62 due to the inclination of the second discharge hole 62 and is discharged from the discharge pipe 37.

  As described above, according to the rotary compressor 110 of the second embodiment, the lower space 44 extends from the first discharge hole 61 that is inclined so as to open toward the downstream side in the rotation direction of the rotor 16. Further, the working fluid and the lubricating oil discharged to the rotor 16 are further added to the swirl flow generated by the rotation of the rotor 16, so that the separation of the working fluid and the lubricating oil by the centrifugal force can be promoted.

  Further, by arranging the second discharge hole 62 upstream of the first discharge hole 61 in the rotation direction of the rotor 16 and close to the first discharge hole 61, the circumferential direction of the sealed container 1 is achieved. The distance along which the working fluid flows and the time during which the working fluid stays in the lower space 44 can be made longer. For this reason, the working fluid and the lubricating oil can be more effectively separated by the swirling flow.

  Furthermore, by installing the partition plate 39 between the first discharge hole 61 and the second discharge hole 62, the working fluid and the lubricating oil discharged from the first discharge hole 61 can enter the lower space 44. Immediately after flowing in, it can be prevented from being discharged from the second discharge hole 62 to the outside of the sealed container 1. For this reason, more working fluid and lubricating oil can be retained in the lower space 44, and centrifugal separation by a swirling flow can be performed.

  Further, a large density of lubricating oil swirling in the lower space 44 is gradually present from the rotation center portion of the rotor 16 to the radial direction by the centrifugal force, that is, as it approaches the inner peripheral surface of the sealed container 1. Become. Therefore, by installing the second discharge hole 62 on the rotation center side of the rotor 16 and the upstream side in the rotation direction of the rotor 16 with respect to the first discharge hole 61, a working fluid having a lower lubricating oil concentration can be obtained. It can be discharged from the second discharge hole 62.

  Furthermore, by arranging the opening of the second discharge hole 62 with an inclination toward the downstream side in the rotation direction of the rotor 16, the working fluid suddenly changes its direction when flowing into the second discharge hole 62. You will be forced to change. By this rapid change of direction, it is possible to obtain a centrifugal effect of further working fluid and lubricating oil.

  Further, in the second embodiment, the first discharge hole 61 and the second discharge hole 62 are arranged so as to protrude upward from the upper bearing member 28, so that the lower space 44 than the first discharge hole 61. When the working fluid is discharged, it is possible to prevent the lubricating oil temporarily accumulated on the upper surface of the upper bearing member 28 from being rolled up. Further, when the working fluid flows out from the second discharge hole 62 to the outside of the sealed container 1, it is possible to prevent the lubricating oil accumulated on the upper surface of the upper bearing member 28 from being caught and flown out. Lubricating oil discharged to the outside can be reduced.

  Further, the density of lubricating oil swirling in the lower space 44 is reduced toward the upper side of the lower space 44 due to gravity. That is, a working fluid having a low lubricating oil concentration stays above the lower space 44, and a working fluid having a high lubricating oil concentration stays below. In this way, by disposing the second discharge hole 62 above the first discharge hole 61, the working fluid having a relatively low concentration of lubricating oil staying in the lower space 44 is supplied to the second discharge hole 62. Since it can introduce | transduce, the lubricating oil discharged to the exterior of the airtight container 1 can be reduced.

  Therefore, according to the rotary compressor 100 in the first embodiment, the working fluid and the lubricating oil can be more effectively separated, and therefore the lubricating oil discharged from the discharge pipe 37 to the outside of the sealed container 1. Can be further reduced.

  Further, by arranging the end of the partition plate 39 on the rotation center side of the rotor 34, the working fluid having a lower lubricating oil concentration present on the rotation center side of the rotor 34 can be introduced into the second discharge hole 62. Furthermore, the working fluid having a reduced lubricating oil concentration can be discharged to the outside of the sealed container 20.

  In the first and second embodiments, the openings of the first discharge hole and the second discharge hole are inclined toward the downstream side in the rotation direction of the rotor 16. Even when both or one of the second discharge hole and the second discharge hole are disposed upward without being inclined, the working fluid discharged from the first discharge hole by the partition plate 39 is allowed to flow into the lower space. An effect of preventing discharge from the second discharge hole to the outside of the sealed container 1 immediately after flowing into 44 can be obtained. As a result, more working fluid that has flowed into the lower space 44 from the first discharge hole can be retained in the lower space 44, and centrifugal separation between the working fluid and the lubricating oil by the swirling flow is performed more effectively. be able to.

  In the first and second embodiments, the compression mechanism is a rotary type compressor. However, the present invention is not limited to this, and the working fluid and lubricating oil can be effectively separated in the scroll type and the reciprocating type as well. Since it can isolate | separate, the lubricating oil discharged from the discharge pipe 37 can be reduced. Moreover, even if it is not a compressor but an expander, it has the same effect.

  The fluid machine of the present invention is applied to a compressor or an expander having lubricating oil, and is useful for a refrigeration cycle such as a refrigerator-freezer, an air conditioner, a water heater, or a car air conditioner.

1 is a longitudinal sectional view of a rotary compressor according to Embodiment 1 of the present invention. Enlarged view of the compression mechanism in FIG. 1 is a cross-sectional view of the compression mechanism section taken along line AA in FIG. 1 is a cross-sectional view of the rotary compressor taken along line BB in FIG. 4 is a cross-sectional view of the first discharge hole taken along line Y1-Y1 in FIG. FIG. 4 is a cross-sectional view of the second discharge hole taken along line Y2-Y2. Longitudinal sectional view of a rotary compressor according to Embodiment 2 of the present invention Cross section of rotary compressor taken along line CC in FIG. FIG. 8 is a longitudinal sectional view of the compression mechanism section taken along line DD in FIG. FIG. 8 is a cross-sectional view of the first discharge hole taken along line W1-W1. Cross-sectional view of the second discharge hole taken along line W2-W2 in FIG. Longitudinal section of a conventional rotary compressor Vertical section of a conventional scroll compressor

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Airtight container 2 Electric motor 3 1st compression mechanism part 4 2nd compression mechanism part 5,10 Intermediate | middle discharge pipe 6 Refrigerant introduction pipe 7 Multistage rotary type compression mechanism part 8,36 Suction pipe 9 Scroll type compression mechanism part 11 Communication pipe 12 Internal space 13, 37 Discharge pipe 13a Opening part 16 Rotor 17 Stator 18 First suction pipe 19 Second suction pipe 20 Vane groove 21, 60 Compression mechanism part 23 Shaft 23a Eccentric part 23b Oil groove 23c Oil path 24 Cylinder 25 Piston 26 Vane 27 Spring 28 Upper bearing member 29 Lower bearing member 30 Muffler 31 Suction chamber 32, 61 First discharge hole 33, 62 Second discharge hole 35 Introduction terminal 38 Oil reservoir 39, 70 Partition plate 40 Back space 41, 43, 45 Communication path 42 Muffler space 44 Lower space 46 Lubricating oil flow path 50 Compression chamber 100, 110, 20 rotary compressor 130 scroll compressor

Claims (7)

A sealed container;
An electric motor provided in the sealed container;
A compression mechanism that is disposed below the electric motor in the sealed container and compresses the working fluid sucked from outside the sealed container;
A first discharge hole for discharging the working fluid compressed by the compression mechanism between the compression mechanism and the electric motor;
A second discharge hole that is disposed upstream of the first discharge hole in the rotation direction of the electric motor and between the cylinder member of the compression mechanism and the electric motor, and discharges the working fluid from the sealed container;
A partition plate disposed between the first discharge hole and the second discharge hole;
Equipped with a compressor. The compressor according to claim 1, wherein the second discharge hole is disposed closer to a rotation center side of the electric motor than the first discharge hole. The compressor according to claim 1 or 2, wherein the opening of the first discharge hole is arranged toward the downstream side in the rotation direction of the electric motor. The compressor according to any one of claims 1 to 3, wherein the second discharge hole has an opening disposed toward a downstream side in a rotation direction of the electric motor. The compressor according to any one of claims 1 to 4, wherein the first discharge hole and the second discharge hole are arranged to protrude toward the electric motor. The compressor according to any one of claims 1 to 5, wherein the second discharge hole is disposed closer to the electric motor than the first discharge hole. A sealed container;
An electric motor provided in the sealed container;
An expansion mechanism that is disposed below the electric motor in the sealed container and expands the working fluid sucked from outside the sealed container;
A first discharge hole for discharging the working fluid expanded by the expansion mechanism between the expansion mechanism and the electric motor;
A second discharge hole that is disposed upstream of the first discharge hole in the rotation direction of the electric motor and on the cylinder member of the compression mechanism and the electric motor, and discharges a working fluid from the sealed container;
A partition plate disposed between the first discharge hole and the second discharge hole;
Equipped with an expander.

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