JP2012052438A - Rotary compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary compressor improving workability when using an oil separation means for reducing discharge of oil to the outside of a sealed container by centrifugal separation.SOLUTION: The rotary compressor 10 is provided, wherein an electric element 14 and a rotary compression mechanism unit 18 driven by a rotary shaft 16 of the electric element 14 are housed in a sealed container 12. An oil separation mechanism 90 structured in the rotary compression mechanism unit 18 and separating the oil in the cooling medium compressed and discharged by the rotary compression mechanism unit by centrifugal separation includes: a cylindrical space part 91 having a central axis in a vertical direction; a cooling medium inlet part 95 for introducing the cooling medium into the space part 91; a cooling medium outlet part 97 communicating with the inside of the space part on the central axis of the space part 91; and a small hole 98 communicating with a lower end of the space part. The space part 91 is composed of cylindrical holes 91A to 91E having different inner diameters, and the inner diameter of any hole at the lower side is smaller than that at the upper side.

Description

  The present invention relates to a rotary compressor in which an electric element and a rotary compression mechanism portion driven by the electric element are housed in an airtight container.

  Conventionally, in this type of rotary compressor, for example, an internal intermediate pressure type multi-stage (two-stage) compression type rotary compressor provided with first and second rotary compression elements, an electric element and a rotation driven by the electric element in a hermetic container It is comprised by the compression mechanism part. Then, the refrigerant gas is sucked into the low pressure chamber side of the cylinder from the suction port of the first rotary compression element, is compressed by the operation of the roller and the vane to become an intermediate pressure, and the discharge port and the discharge silencer chamber are opened from the high pressure chamber side of the cylinder. After that, it is discharged into a sealed container. The intermediate-pressure refrigerant gas in the sealed container is sucked into the low-pressure chamber side of the cylinder from the suction port of the second rotary compression element, and the second-stage compression is performed by the operation of the roller and the vane, so that the high-temperature and high-pressure refrigerant gas. Thus, the pressure is discharged from the high pressure chamber side to the outside of the compressor through the discharge port and the discharge silencer chamber.

  Also, the bottom of the sealed container is an oil reservoir, and oil is sucked up from the oil reservoir by an oil pump (oil supply means) attached to one end (lower end) of the rotating shaft, and is transferred to the sliding portion of the rotary compression mechanism. Provided for lubrication and sealing. However, the oil mixed in the refrigerant gas compressed by the first rotary compression element as described above is discharged into the hermetic container and separated to some extent from the refrigerant gas in the process of moving through the space in the hermetic container. The oil mixed in the refrigerant gas compressed by the second rotary compression element was directly discharged to the outside of the compressor together with the refrigerant gas.

  For this reason, there has been a problem that the oil in the oil reservoir is insufficient and the sliding performance and the sealing performance deteriorate. In addition, the oil discharged to the outside of the compressor may adversely affect the refrigerant circuit, for example, hindering the refrigerant circulation in the refrigerant circuit. On the other hand, a device has been devised in which an oil separator is connected to a pipe outside the hermetic container to separate the oil from the discharged refrigerant gas and return to the compressor, but problems such as an increase in installation space arise. These are the same problems that occur in internal high-pressure (single-stage) rotary compressors in which the sealed container is the final pressure. However, the compressor is not limited to the internal intermediate pressure type, and the rotary compressor in which the final discharge pressure does not appear in the sealed container. Is a very serious problem.

  Therefore, an oil separation mechanism that separates the oil in the refrigerant gas discharged from the second rotary compression element using centrifugal force is disposed between the rotary compression mechanism and the inner surface of the sealed container, and is discharged outside the sealed container. The oil is separated from the refrigerant, and the separated oil flows down to the oil reservoir at the bottom of the closed container through the pores formed at the lower end of the oil separation mechanism (see, for example, Patent Document 1).

JP 2005-105986 A JP 2005-105985 A

  However, when an oil separation mechanism is provided between the rotary compression mechanism and the sealed container as in the prior art, at least the radial dimension of the sealed container must be increased accordingly. In addition, since the number of parts constituting the compressor is remarkably increased, there is a problem that the cost increases.

  In view of this, a proposal is made to provide an oil separation mechanism using centrifugal force in the cover that closes the recess of the support member in order to constitute the discharge silencer chamber of the second rotary compression element, not between the rotary compression mechanism and the sealed container. However, for example (see Patent Document 2 above), a space portion in which the refrigerant gas swirls in order to smoothly separate the oil from the refrigerant gas in the oil separation mechanism and to flow out the refrigerant gas from the oil separation mechanism. Since the lower part of the structure is formed so as to gradually narrow in a funnel shape toward the pores at the lower end, processing during production has become extremely troublesome. The present invention has been made to solve the conventional technical problems, and is a rotary that has improved workability when using an oil separation means that reduces oil discharge to the outside of a sealed container by centrifugation. The purpose is to provide a compressor.

  The rotary compressor according to the present invention includes an electric element and a rotary compression mechanism that is driven by a rotating shaft of the electric element in a sealed container. Oil separation means is provided for centrifuging the oil in the refrigerant compressed and discharged by the compression mechanism section. The oil separation means includes a cylindrical space portion whose central axis is set in the vertical direction, and a space in the space portion. A refrigerant introduction part for introducing the refrigerant, a refrigerant outlet part communicating with the space part on the central axis of the space part, and an oil outflow part communicating with the lower end of the space part, the space part having different inner diameters It is composed of a plurality of cylindrical holes, and the inner diameter of each hole is smaller in the lower part.

  According to the present invention, in a rotary compressor formed by housing an electric element and a rotary compression mechanism part driven by the rotary shaft of the electric element in an airtight container, the rotary compression mechanism part is configured. Oil separation means for centrifuging the oil in the discharged refrigerant that has been compressed and discharged by the section, so that the oil that has been compressed by the rotary compression mechanism section and mixed in the discharged refrigerant is centrifuged by the oil separation means. The amount of oil discharged to the outside of the rotary compressor can be reduced.

  Further, since the oil separation means is configured as the rotary compression mechanism, it is not necessary to provide a special mechanism for the oil separation means between the rotary compression mechanism and the sealed container, and an increase in the number of parts is suppressed.

  Further, the oil separating means communicates in the space portion on the central axis of the space portion, a cylindrical space portion whose center axis is set in the vertical direction, a refrigerant introduction portion for introducing the refrigerant into the space portion, and the space portion. Since the refrigerant outlet portion and the oil outflow portion communicated with the lower end of the space portion are provided, the refrigerant flowing into the space portion from the refrigerant introduction portion swirls along the inner peripheral surface of the space portion, and then the refrigerant is discharged. The oil separated from the refrigerant flows into the oil outflow portion as it flows into the portion. As a result, the refrigerant is swirled in the space of the oil separation means, the oil is efficiently separated by centrifugal force, the refrigerant flows into the refrigerant outlet, and the separated oil smoothly flows into the sealed container via the oil outlet. It becomes possible to return to etc.

  In particular, since the space portion is composed of a plurality of cylindrical holes having different inner diameters, and the inner diameter of each hole is made smaller toward the lower one, the separation of oil from the refrigerant and the refrigerant outlet portion of the refrigerant from which the oil has been separated As compared with the case where the diameter of the lower portion of the space portion is gradually reduced while smoothly flowing into the space, the processing for forming the space portion can be remarkably simplified. As a result, it is possible to prevent or suppress an increase in the size and cost of the rotary compressor.

  In the above rotary compressor, the rotary compression mechanism section includes a cylinder having a compressor in which the refrigerant is compressed, and a closing member that closes the compression chamber by having a discharge chamber into which the refrigerant compressed in the cylinder is discharged. The space portion of the oil separating means is formed from the closing member to the cylinder, and the inner diameter of the hole in the cylinder portion is smaller than the inner diameter of the hole in the closing member portion.

  According to the present invention, in addition to the above, the rotary compression mechanism section includes a cylinder having a compressor in which the refrigerant is compressed, and a discharge chamber into which the refrigerant compressed in the cylinder is discharged. Since the space portion of the oil separating means extends from the closing member to the cylinder, the vertical dimension of the oil separating means is ensured without enlarging the dimensions of the rotary compressor. Will be able to. Thereby, it is not necessary to narrow the refrigerant introduction portion in order to increase the flow rate of the refrigerant in the oil separation means, and an increase in pressure loss in the oil separation means can be effectively suppressed.

  Further, since the oil separation means is constructed from the closing member having the discharge chamber to the cylinder, the oil that is compressed in the cylinder and mixed in the refrigerant discharged to the discharge chamber is effectively centrifuged by the oil separation means. In addition to being able to separate, the path from the discharge chamber to the oil separating means can be shortened and simplified.

  Particularly, since the inner diameter of the hole of the cylinder part constituting the space part is made smaller than the inner diameter of the hole of the closing member part, the space part is formed only by changing the inner diameter of the hole formed in the cylinder and the hole formed in the closing member. Thus, the workability is further improved.

  In the above rotary compressor, the space of the cylinder part and / or the closing member part is constituted by a plurality of holes.

  According to the present invention, if the space portion of the cylinder portion and / or the closing member portion is constituted by a plurality of holes, the shape of the space portion can be tapered more gradually in the space portion. The swirling refrigerant can flow out more smoothly than the refrigerant outlet.

  In the above rotary compressor, the discharge valve disposed in the discharge chamber, the refrigerant discharge pipe connected to the hermetic container, and the closing member are connected to the discharge chamber and the refrigerant discharge pipe to be discharged into the discharge chamber. A discharge passage for discharging the refrigerant to the outside without passing through the inside of the sealed container, and the oil separation means is configured to be interposed between the discharge valve and the discharge passage.

  In the above rotary compressor, the rotary compression mechanism unit includes first and second rotary compression elements, discharges the refrigerant compressed by the first rotary compression element into the sealed container, and is discharged into the sealed container. The refrigerant is compressed by a cylinder constituting the second rotary compression element and discharged into a discharge chamber.

  According to this invention, in addition to the above, the discharge valve disposed in the discharge chamber, the refrigerant discharge pipe connected to the hermetic container, and the closing member are formed, and the discharge chamber and the refrigerant discharge pipe are communicated with each other to discharge. Since the refrigerant discharged into the chamber is provided with a discharge passage for discharging outside without passing through the sealed container, and the oil separation means is configured to be interposed between the discharge valve and the discharge passage, for example, The rotary compression mechanism is composed of first and second rotary compression elements, the refrigerant compressed by the first rotary compression element is discharged into the closed container, and the refrigerant discharged into the closed container is discharged into the second container. Like a rotary compressor that compresses with the second cylinder constituting the rotary compression element and discharges it into the discharge chamber, the refrigerant does not pass through the sealed container from the discharge chamber, that is, without separating oil in the sealed container. Rotary compressor that discharges to the outside The outflow of Tsu sub oil it is possible to effectively suppress the oil separating means.

  In this case, since the oil separation means is provided between the discharge valve and the discharge passage, the flow of the refrigerant from the discharge valve to the discharge passage through the discharge chamber and the oil separation means is smoothed, and the path Can also be the shortest distance.

  In the above rotary compressor, the discharge chamber is composed of a recess formed on the upper surface of the closing member and a cover that closes the upper surface opening of the recess, and the refrigerant outlet portion of the oil separating means is on the lower surface of the cover. It is characterized by comprising a groove formed.

  According to this invention, in addition to the above, the discharge chamber is composed of a recess formed on the upper surface of the closing member and a cover for closing the upper surface opening of the recess, and the refrigerant outlet portion of the oil separating means Is constituted by a groove formed on the lower surface of the cover, the structure can be remarkably simplified and the production cost can be reduced as compared with the case where the refrigerant outlet portion is constituted by piping.

  In the above rotary compressor, a rectifying plate is disposed in the refrigerant outlet portion.

  According to this invention, in addition to the above, since the current plate is arranged in the refrigerant outlet, the flow of the refrigerant that rises and flows into the refrigerant outlet after turning in the space can be smoothed. As a result, it becomes possible to eliminate or reduce the direct outflow of the refrigerant from the refrigerant introduction section to the refrigerant extraction section that occurs when the turbulent flow is generated in the upward flow of the refrigerant flowing into the refrigerant extraction section. Thus, it is possible to improve the oil separation performance when the refrigerant outlet is configured.

  The rotary compressor includes a gasket interposed between the closing member and the cover. With this gasket, the communication portion between the refrigerant outlet portion and the space portion is opened in the space portion on the central axis of the space portion. Characterized by narrowing.

  According to the present invention, in addition to the above, a gasket interposed between the closing member and the cover is provided, and with this gasket, the refrigerant outlet portion and the space portion are opened in the space portion on the central axis of the space portion. Since the communication part with Narrow is narrowed, it is possible to eliminate or reduce the inconvenience that the refrigerant flows out directly from the refrigerant introduction part to the refrigerant outlet part without turning in the space part, and the groove leads out the refrigerant. It is possible to improve the oil separation performance when the part is configured.

  ADVANTAGE OF THE INVENTION According to this invention, the rotary compressor which improved the workability at the time of using the oil separation means which reduces the discharge of the oil to the exterior of a sealed container by centrifugation can be provided.

It is a schematic longitudinal cross-sectional view of the rotary compressor of the Example to which this invention is applied (Example 1). It is a schematic longitudinal cross-sectional view of the rotary compression mechanism part of the rotary compressor of FIG. It is a top view except the upper cover and gasket of the rotary compression mechanism part of the rotary compressor of FIG. It is an enlarged view of the oil separation mechanism part of FIG. It is an enlarged plan view except the upper cover and gasket of the oil separation mechanism part of the rotary compressor of the other Example of this invention (Example 2). FIG. 6 is an enlarged longitudinal sectional view of an oil separation mechanism portion of the rotary compressor in FIG. 5. FIG. 10 is an enlarged plan view of an oil separation mechanism portion of a rotary compressor according to another embodiment of the present invention excluding an upper cover (third embodiment). FIG. 8 is an enlarged longitudinal sectional view of an oil separation mechanism portion of the rotary compressor in FIG. 7.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  1 is a schematic longitudinal sectional view of a rotary compressor 10 according to an embodiment of the present invention, FIG. 2 is a schematic longitudinal sectional view of a rotary compression mechanism section 18, and FIG. 3 is a diagram excluding an upper cover 66 and a gasket 65 of the rotary compression mechanism section 18. A plan view and FIG. 4 show enlarged views of the main part. It should be noted that the positional relationship of the members in each drawing is shown in place of the actual arrangement for ease of explanation, and may be different from the actual positional relationship.

  In each figure, 10 is an internal intermediate pressure type multi-stage (two-stage) compression type vertical rotary compressor as an embodiment of the present invention. This rotary compressor 10 includes a vertical cylindrical sealed container 12 made of a steel plate, An electric element (driving element) 14 disposed and housed above the internal space of the hermetic container 12 and a first rotary compression element disposed below the electric element 14 and driven by the rotating shaft 16 of the electric element 14 32 (first stage) and the second rotary compression element 34 (second stage) located on the upper side of the rotary compression mechanism section 18.

  The sealed container 12 has an oil sump 13 at the bottom, a container body 12A that houses the electric element 14 and the rotary compression mechanism 18, and a generally bowl-shaped end cap (lid) 12B that closes the upper opening of the container body 12A. A terminal (wiring is omitted) 20 for supplying power to the electric element 14 is attached to the center of the upper surface of the end cap 12B.

  The electric element 14 includes a stator 22 attached in an annular shape along the inner peripheral surface of the upper space of the hermetic container 12, and a rotor 24 inserted and arranged with a slight gap inside the stator 22. The rotor 24 is fixed to the rotary shaft 16 that extends through the center in the vertical direction (the axial direction of the sealed container 12).

  The stator 22 has a laminated body 26 in which donut-shaped electromagnetic steel plates are laminated, and a stator coil 28 wound around the teeth of the laminated body 26 by a direct winding (concentrated winding) method. Similarly to the stator 22, the rotor 24 is also formed by a laminated body 30 of electromagnetic steel plates, and a permanent magnet MG is inserted into the laminated body 30.

  The rotary compression mechanism 18 constitutes first and second rotary compression elements 32 and 34, respectively, and has a lower cylinder (first cylinder) 40 and an upper cylinder (first cylinder) having compression chambers in which refrigerant is compressed. 2 cylinders) 38, upper and lower rollers 46 and 48 which are fitted in upper and lower eccentric portions 42 and 44 provided in the upper and lower cylinders 38 and 40, respectively, and are rotated eccentrically, and upper and lower cylinders 38 and 40 and rollers 46 and 48. Between the first and second rotary compression elements 32 and 34, and the rollers 46 and 48 in contact with the compression chambers in the upper and lower cylinders 38 and 40, respectively. The vanes 50 and 52 partitioned on the chamber side, the upper opening surface of the compression chamber of the upper cylinder 38, and the lower opening surface of the compression chamber of the lower cylinder 40 are respectively closed, and the bearings 54A and 56A of the rotary shaft 16 are closed. Are composed of an upper support member as closing member is a supporting member having (upper closing member) 54 and a lower support member (lower closing member) 56.

  The upper support member 54 and the lower support member 56 include suction passages 60 (FIG. 3) and 61 that communicate with the inside of the upper and lower cylinders 38 and 40 through suction ports (not shown), and the upper and lower support members of the upper support member 54. A discharge silencer having a certain volume as a discharge chamber formed by recessing a part of the lower surface of each of the 56 and closing the upper surface opening and the lower surface opening of each recess by the upper cover 66 and the lower cover 68, respectively. Chambers 62 and 64 are provided. That is, the upper support member 54 and the lower support member 56 have a certain thickness dimension so as to form the recesses in the discharge silencer chambers 62 and 64. The bearings 54A and 56A may be formed on the upper cover 66 and the lower cover 68.

  In this case, a sealing gasket 65 is interposed between the upper support member 54 and the upper cover 66 (although not illustrated, it is also interposed between the lower support member 56 and the lower cover 68). . Further, the lower cover 68 is fixed to the lower support member 56 from the bottom by a main bolt 129. The front ends of the main bolts 129 are screwed into the upper support member 54.

  The discharge silencer chamber 64 of the first rotary compression element 32 and the inside of the sealed container 12 are communicated with each other through a communication path. This communication path is a hole (not shown) that passes through the lower support member 56, the upper support member 54, the upper cover 66, the upper and lower cylinders 38 and 40, and the intermediate partition plate 36. In this case, an intermediate discharge pipe 121 is erected at the upper end of the communication path, and an intermediate pressure refrigerant is discharged from the intermediate discharge pipe 121 into the sealed container 12.

  The electric element 14 is provided above the upper cover 66 in the sealed container 12 with a predetermined interval. The periphery of the upper cover 66 is fixed to the upper support member 54 from above by main bolts 78. The front ends of the main bolts 78 are screwed into the lower support member 56.

  On the other hand, a vertical oil hole 80 is formed in the rotary shaft 16 at the center of the shaft, and the oil hole 80 communicates with an oil pump 84 at the lower end. The oil pump 84 sucks up the oil in the oil reservoir 13 into the oil hole 80 by the rotation of the rotating shaft 16. The rotary shaft 16 is further formed with a lateral oil supply hole 82 (upper and lower eccentric parts 42 and 44 and a plurality of upper and lower parts thereof) communicating with the oil hole 80, from which the rotary compression mechanism part 18 is formed. The oil is supplied to the bearings 54A, 56A and other sliding portions.

  In this case, carbon dioxide (CO2) is used as the refrigerant, and the final pressure of the rotary compressor 10 is extremely high. As the lubricating oil, existing oils such as mineral oil (mineral oil), PAG (polyalkylene glycol), alkylbenzene oil, ether oil and ester oil are used.

  On the side surface of the container body 12 </ b> A of the sealed container 12, the suction passages 60 and 61 of the upper support member 54 and the lower support member 56, and a position corresponding to the upper side of the upper cover 66 (a position substantially corresponding to the lower end of the electric element 14). The sleeves 141, 142, 143 and 144 are fixed by welding. The sleeves 141 and 142 are adjacent to each other in the vertical direction, and the sleeve 143 is shifted from the sleeve 144 by approximately 90 degrees.

  One end of a refrigerant introduction pipe 92 for introducing refrigerant gas into the upper cylinder 38 is inserted into and connected to the sleeve 141, and one end of the refrigerant introduction pipe 92 communicates with the suction passage 60 of the upper cylinder 38. The refrigerant introduction pipe 92 passes through the upper side of the sealed container 12 to reach the sleeve 144, and the other end is inserted and connected into the sleeve 144 to communicate with the sealed container 12.

  One end of a refrigerant introduction pipe 94 for introducing refrigerant gas into the lower cylinder 40 is inserted into and connected to the sleeve 142, and one end of the refrigerant introduction pipe 94 communicates with the suction passage 61 of the lower cylinder 40. In addition, a refrigerant discharge pipe 96 is inserted and connected in the sleeve 143 and communicates with a discharge passage 70 (FIG. 3) provided in the upper support member 54.

  The rotary compression mechanism portion 18 is configured with an oil separation mechanism 90 as an oil separation means of the present invention for separating the oil in the refrigerant compressed and discharged by the second rotary compression element 34, The oil separation mechanism 90 extends from the upper support member 54 of the second rotary compression element 34 to the upper cylinder (second cylinder) 38 and the intermediate partition plate 36 to the lower cylinder (first cylinder) 40. Yes.

  Next, the oil separation mechanism 90 will be described. As shown in FIG. 3, a recess is formed around the bearing 54 </ b> A of the upper support member 54. As described above, the upper surface opening of the recess is blocked by the upper cover 66 via the gasket 65. Thus, the inside of the recess is the discharge silencer chamber 62 of the second rotary compression element 34. A discharge valve 72 for closing a discharge port (not shown) communicating with the inside of the upper cylinder 38 is disposed in the discharge silencer chamber 62. The discharge valve 72 opens the discharge port when the high pressure chamber of the upper cylinder 38 rises to a specified discharge pressure.

  Further, the discharge passage 70 is formed on the substantially opposite side across the discharge valve 72 and the bearing 54A, and communicates with the discharge silencer chamber 62. The discharge silencing chamber 62 is divided into a discharge valve 72 side (62A) and a discharge passage 70 side (62B) by partition walls 54B and 54C formed on the upper support member 54 at a position substantially opposite to the bearing 54A. The oil separation mechanism 90 according to the present invention is configured within one partition wall 54C.

  The oil separation mechanism 90 includes a cylindrical first hole 91A formed through the upper support member 54, and a cylindrical second hole formed in the upper cylinder (second cylinder) 38 corresponding to the lower side thereof. 91B, a third cylindrical hole 91C formed in the upper cylinder 38 corresponding to the lower side thereof, and a fourth cylindrical hole 91D formed in the intermediate partition plate 36 corresponding to the lower side thereof. And a cylindrical fifth hole 91E formed in the intermediate partition plate 36 corresponding to the lower side thereof, and as a whole, a cylindrical space portion 91 whose central axis is the vertical direction, and this A refrigerant introducing portion 95 that is formed in the upper edge of the space 91 opposite to the bearing 54A of the hole 91A, and one end located in the space 91 (hole 91A) is positioned on the central axis of the space 91. Opened and the other end is a discharge silencing chamber 62 on the suction passage 70 side (shown by 62B in FIGS. 3 and 4). ) Opening the refrigerant outlet portion 97, the oil reservoir 104 formed in the upper surface of the lower cylinder (first cylinder) 40 corresponding to the lower end of the hole 91 </ b> E constituting the space portion 91, and the oil reservoir 104. It is composed of a pore 98 as an oil outflow portion formed in the lower cylinder (first cylinder) 40 in communication.

  The space 91 has a cylindrical shape as a whole by holes 91A, 91B, 91C, 91D, and 91E that are continuous in the vertical direction, but the inner diameter of the second hole 91B is smaller than the inner diameter of the first hole 91A. The inner diameter of the third hole 91C is smaller than the inner diameter of the second hole 91B. The inner diameter of the fourth hole 91D is the same as the inner diameter of the third hole 91C, but the inner diameter of the fifth hole 91E is smaller than the inner diameter of the fourth hole 91D. That is, the inner diameters of the plurality of holes 91 </ b> A to 91 </ b> E constituting the space portion 91 are configured so as to be smaller toward the lower portion, whereby the lower portion of the space portion 91 is directed toward the oil reservoir 104 and the pores 98. It has a shape in which the inner diameter gradually decreases.

  In this case, the first hole 91A is formed through by cutting the upper support member 54 with the first drill having the maximum diameter. The second hole 91B is formed by cutting the upper cylinder (second cylinder) 50 from above to the middle with a second drill having a smaller diameter than the first drill. The third hole 91C is formed by cutting the upper cylinder (second cylinder) 50 from above or below with a third drill having a diameter smaller than that of the second drill and communicating with the second hole 91B. These holes 91B and 91C are formed by passing through the upper cylinder 38. That is, in the embodiment, a plurality of holes 91B and 91C having different inner diameters are formed in the upper cylinder 38.

  The fourth hole 91D is formed by cutting the intermediate partition plate 36 from above to the middle with the third drill. The fifth hole 91E is a fourth drill having a diameter smaller than that of the third drill, and the intermediate partition plate 36 is cut from above or below, and communicated with the fourth hole 91D so as to communicate with the holes 91D and 91E. Is formed by penetrating the intermediate partition plate 36. That is, in the embodiment, a plurality of holes 91D and 91E having different inner diameters are formed in the intermediate partition plate 36.

  Further, the pore 98 as the oil outflow portion extends from the oil reservoir 104 in the lower cylinder (first cylinder) 40 toward the sealed container 12, and opens into and communicates with the sealed container 12. Thereby, the pore 98 communicates the lower end of the space portion 91 (hole 91E) and the inside of the sealed container 12 through the oil reservoir 104.

  Further, the refrigerant introduction part 95 communicates with the discharge silencer chamber 62 (shown by 62A in FIGS. 3 and 4) via the introduction passage 99, and the refrigerant in the discharge silencer chamber 62 is refrigerant. The introduction portion 95 is introduced into the space portion 91 from a tangential direction of a circle centering on the central axis of the space portion 91, and is configured to turn along the inner surface of the space portion 91. The space 91 (hole 91A) and the upper surface of the refrigerant introduction part 95 are closed by the upper cover 66.

  The refrigerant lead-out portion 97 is a groove formed by excavating the lower surface of the upper cover 66 (the upper cover 66 is not actually present in FIGS. 3 and 4, but the groove is indicated by a virtual line (refrigerant lead-out portion 97)). Are shown). That is, one end of the groove extends to the central axis of the space portion 91 (hole 91A) and opens downward at the upper end portion, and the other end is the discharge silencer chamber 62 (62B) on the suction passage 70 side. ) And open downward. And the lower surface opening of the groove | channel between these one ends and the other end is obstruct | occluded from the bottom by the partition wall 54C. As a result, the oil separation mechanism 90 is interposed between the discharge valve 72 and the discharge passage 70.

  Next, the operation of the above configuration will be described. When the stator coil 28 of the electric element 14 is energized through the terminal 20 and a wiring (not shown), the electric element 14 is activated and the rotor 24 rotates. By this rotation, the upper and lower rollers 46 and 48 fitted to the upper and lower eccentric portions 42 and 44 provided integrally with the rotary shaft 16 are eccentrically rotated in the upper and lower cylinders 38 and 40 as described above.

  As a result, the low-pressure refrigerant gas sucked into the low-pressure chamber side of the lower cylinder (first cylinder) 40 from the suction port (not shown) via the suction passage 61 formed in the refrigerant introduction pipe 94 and the lower support member 56 is The intermediate pressure is compressed by the operation of the roller 48 and the vane 52, and is intermediated from the discharge port (not shown) from the high pressure chamber side of the lower cylinder 40 and the discharge muffler chamber 64 formed in the lower support member 56 through the communication path (not shown). It is discharged from the discharge pipe 121 into the sealed container 12. Thereby, the inside of the sealed container 12 becomes an intermediate pressure. In addition, since the discharge silencing chamber 64 is formed so that the flow path through which the refrigerant flows becomes wider or narrower, a silencing effect can be obtained.

  Then, the intermediate-pressure refrigerant gas in the sealed container 12 exits from the sleeve 144, passes through the refrigerant introduction pipe 92 and the suction passage 58 formed in the upper support member 54, and then enters the upper cylinder (second cylinder) from the suction port 60. ) 38 is sucked into the low pressure chamber side. The suctioned intermediate-pressure refrigerant gas is compressed in the second stage by the operation of the roller 46 and the vane 50 to become a high-temperature high-pressure (final pressure) refrigerant gas, and passes through the discharge port (not shown) from the high-pressure chamber side. The discharge valve 72 discharges into a discharge silencer chamber 62 (62A) formed in the upper support member 54. Since the discharge silencing chamber 62 is formed so that the flow path through which the refrigerant flows becomes wider or narrower, a silencing effect can be obtained. The refrigerant discharged into the discharge silencer chamber 62 is discharged from the refrigerant introduction portion 95 into the space portion 91 of the oil separation mechanism 90 through the introduction passage 99 as shown by arrows in FIGS.

  At this time, the refrigerant gas and the oil mixed in the refrigerant gas are discharged along the inner surface of the space portion 91, and the discharged refrigerant gas and oil move along the inner peripheral surface of the space portion 91 due to the momentum at the time of discharge. While descending spirally, the inside of the space portion 91 is lowered to the holes 91A, 91B, 91C, 91D, 91E (FIG. 2).

  At this time, the oil mixed in the refrigerant gas by centrifugal force due to the turning is separated from the refrigerant gas, adheres to the inner surface of the space portion 91, travels along the inner surface, and forms an oil reservoir formed corresponding to the lower end of the space portion 91. It flows into 104 and is stored there. The oil stored in the oil reservoir 104 flows down to the oil reservoir 13 at the lower part of the hermetic container 12 through the pores 98 as indicated by broken line arrows in FIG.

  On the other hand, the refrigerant gas from which the oil has been separated is guided in a stepwise tapered shape in the space portion 91 and gathers at the center, and flows into the inside through an opening at one end of the refrigerant outlet portion 97 as an ascending current. The refrigerant gas that has flowed into the refrigerant outlet 97 passes through a groove (refrigerant outlet 97) formed in the upper cover 66 as shown by a solid arrow in each drawing, and is discharged from the opening at the other end to the discharge passage 70 side. It enters the silencing chamber 62 (62B) and reaches the discharge passage 70 through the discharge silencing chamber 62. And since it flows out into the refrigerant | coolant discharge pipe 96 and is discharged outside, the refrigerant gas discharged by the discharge silencer chamber 62 is discharged outside without passing through the inside of the airtight container 12 by this.

  Thus, the oil mixed in the refrigerant gas compressed by the second rotary compression element 34 is centrifuged by the oil separation mechanism 90, so that the oil mixed in the refrigerant gas can be effectively separated. it can. As a result, the amount of oil discharged from the compressor 10 can be reduced, so that the disadvantage that the compressor 10 is short of oil and the disadvantage that adversely affects the refrigerant circuit can be avoided.

  Further, since the oil separation mechanism 90 is configured in the rotary compression mechanism portion 18, it is not necessary to provide a special mechanism for the oil separation mechanism 90 between the rotary compression mechanism portion 18 and the sealed container 12, and the number of parts is reduced. The increase of is also suppressed.

  Further, the oil separation mechanism 90 includes a cylindrical space portion 91 whose central axis is set in the vertical direction, a refrigerant introduction portion 95 for introducing the refrigerant into the space portion 91, and the central axis of the space portion 91. Since the refrigerant outlet portion 97 communicated with the space portion 91 and the pores 98 communicated with the lower end of the space portion 91 are provided, the refrigerant flowing into the space portion 91 from the refrigerant introduction portion 95 is contained in the space portion 91. Then, the oil flows into the refrigerant outlet 97 and the oil separated from the refrigerant flows down into the pores 98. Thereby, the refrigerant is swirled in the space 91 of the oil separation mechanism 90, the oil is efficiently separated by centrifugal force, the refrigerant flows into the refrigerant outlet 97, and the separated oil is smoothly passed through the pores 98. It becomes possible to return to the sealed container 12.

  In particular, the space portion 91 is composed of a plurality of cylindrical holes 91A to 91E having different inner diameters, and the inner diameters of the holes 91A to 91E are made smaller toward the lower part, so that the oil is separated from the refrigerant and the oil is separated. Thus, the flow of the refrigerant into the refrigerant outlet 97 can be performed smoothly. In this case, when the diameter of the lower portion of the space portion 91 is gradually reduced, processing becomes troublesome. However, if the plurality of holes 91A to 91E having different inner diameters are configured as in the present invention, the holes are formed. Therefore, it is only necessary to change the drill for this purpose, so that the processing for configuring the space portion 91 can be remarkably simplified. As a result, it is possible to prevent or suppress an increase in the size of the rotary compressor 10 and an increase in cost.

  Further, since the space portion 91 of the oil separation mechanism 90 extends from the upper support member 54 to the intermediate partition plate 36 through the upper cylinder (first cylinder) 38, the dimensions of the rotary compressor 10 are increased. Therefore, the vertical dimension of the oil separation mechanism 90 can be secured. Accordingly, it is not necessary to narrow the refrigerant introduction part 95 in order to increase the flow rate of the refrigerant in the oil separation mechanism 90, and an increase in pressure loss in the oil separation mechanism 90 can be effectively suppressed.

  Further, since the oil separation mechanism 90 is configured to extend from the upper support member 54 in which the discharge silencing chamber 62 is configured to the upper cylinder 38, the oil is compressed in the upper cylinder 38 and mixed into the refrigerant discharged into the discharge silencing chamber 62. The oil can be effectively centrifuged by the oil separation mechanism 90, and the path from the discharge silencing chamber 62 to the oil separation mechanism 90 can be shortened and simplified.

  In particular, the inner diameters of the holes 91B and 91C of the upper cylinder 38 part constituting the space 91 are made smaller than the inner diameters of the holes 91A of the upper support member 54 part, and the inner diameter of 91E of the intermediate partition plate 36 part is set to the upper cylinder 38 part. 91C formed in the intermediate partition plate 36, the inner diameter of the hole 91C formed in the upper cylinder 38, the hole 91B formed in the upper cylinder 38, and the hole 91A formed in the upper support member 54. The space portion 91 can be configured simply by changing the inner diameter of the material, and the workability is further improved.

  In particular, if the space 91 of the upper cylinder 38 and the intermediate partition plate 36 is configured with a plurality of holes 91B, 91C, 91D, 91E as in the embodiment, the shape of the space 91 is tapered more gradually. Thus, the refrigerant swirling in the space portion 91 can be more smoothly discharged from the refrigerant outlet portion 97.

  Further, since the oil separation mechanism 90 is configured to be interposed between the discharge valve 72 and the discharge passage 70, the rotary compression mechanism portion 18 is made up of the first and second rotary compression elements 32, 34 as in the embodiment. The refrigerant compressed by the first rotary compression element 32 is discharged into the sealed container 12, and the refrigerant discharged into the sealed container 12 is discharged by the upper cylinder 38 constituting the second rotary compression element 34. Like the rotary compressor 10 that compresses and discharges into the discharge silencing chamber 62, the refrigerant is discharged to the outside without passing through the inside of the sealed container 12 from the discharge silencing chamber 62, that is, without separating oil in the sealed container 12. The oil separation mechanism 90 can effectively suppress the oil outflow of the rotary compressor 10 to be performed.

  In this case, since the oil separation mechanism 90 is provided between the discharge valve 72 and the discharge passage 70, the refrigerant separating from the discharge valve 72 to the discharge passage 70 through the discharge silencing chamber 62 and the oil separation mechanism 90 is provided. The flow can be smoothed, and the route can also be the shortest distance.

  Further, since the refrigerant lead-out portion 97 of the oil separation mechanism 90 is configured by a groove formed on the lower surface of the upper cover 66, the structure is significantly simplified as compared with the case where the refrigerant lead-out portion 97 is configured by piping, Production costs can be reduced.

  5 and 6 show another embodiment of the present invention. In this case, a rectifying plate 105 is disposed in the refrigerant outlet portion 97. The rectifying plate 105 hangs down from the upper cover 66 constituting the upper wall of the groove constituting the refrigerant lead-out portion 97, and extends a predetermined distance in the extending direction at the center of the groove. Other structures are the same as those shown in FIGS.

  Here, when the refrigerant outlet portion 97 is configured by the groove of the upper cover 66 as in the embodiment without using a pipe, there is no portion that enters the space portion 91, and therefore the inner peripheral surface of the space portion 91 is swirled. Then, turbulent flow is likely to occur in the flow of the refrigerant gas that rises and flows into the refrigerant outlet portion 97. When turbulent flow occurs, the refrigerant that has flowed into the space portion 91 from the refrigerant introduction portion 95 is likely to travel directly to the refrigerant outlet portion 97 on the rising airflow. However, as in this embodiment, the refrigerant outlet portion 97 If the rectifying plate 105 is provided inside, the flow of the refrigerant that rises in the space portion 91 and flows into the refrigerant outlet portion 97 can be smoothed. Thereby, it is possible to eliminate or reduce the direct outflow of the refrigerant from the refrigerant introduction part 95 to the refrigerant outlet part 97, and it is possible to improve the oil separation performance.

  7 and 8 show another embodiment of the present invention. In this case, the hole on one end side of the refrigerant lead-out portion 97 of the gasket 65 interposed between the upper support member 54 and the upper cover 66 is made smaller as a circle indicated by 65A in FIG. Thereby, the communication part of the refrigerant | coolant derivation | leading-out part 97 and the space part 91 will be in the state narrowed rather than the case of said each Example in the state opened in the said space part 91 on the central axis of the space part 91. FIG.

  Here, when the refrigerant lead-out portion 97 is configured by the groove of the upper cover 66 as in the embodiment without using a pipe, there is no portion that enters the space portion 91, so that the refrigerant introduction portion 95 is inevitably used as described above. The refrigerant that has flowed into the space portion 91 is likely to travel directly to the refrigerant outlet portion 97 on the rising airflow. However, as in this embodiment, the communication portion between the refrigerant outlet portion 97 and the space portion 91 is provided by the gasket 65. Can be eliminated or reduced without causing the refrigerant to flow directly from the refrigerant introduction part 95 to the refrigerant outlet part 97 without turning in the space 91, and the oil separation performance can be reduced. It becomes possible to improve.

  In the embodiment, the present invention is applied to a so-called internal intermediate pressure type multi-stage (two-stage) compression type rotary rotary compressor. However, the present invention is not limited to this, and so-called single-stage or three-stage or more multi-stage compression rotary compressors are used. In particular, the present invention is extremely effective when applied to the refrigerant discharged to the discharge muffler chamber and discharged to the outside without passing through the sealed container.

  That is, in the case of a single stage, the space portion 91 may be configured so as to extend from the upper support member to the cylinder (from the upper support member 54 of the embodiment to the upper cylinder 38). In that case, the oil reservoir 104 and the pores 98 may be configured as a cylinder, or may be configured as a lower support member (the position of the intermediate partition plate 36 of the embodiment).

  Also in the case of a two-stage compression type rotary compressor as in the embodiment, the oil separating mechanism 90 extends from the upper support member 54 to the upper cylinder (first cylinder) 38 or to the intermediate partition plate 36. In this case, the oil reservoir 104 and the pore 98 may be configured in the upper cylinder (first cylinder) 38 or the intermediate partition plate 36.

  In the embodiment, the oil separated by the oil separation mechanism 90 is returned to the oil reservoir 13 in the sealed container 12 through the pores 98, but is not limited thereto, and is returned to the sliding portion of the rotary compression mechanism portion 18 or the like. It does n’t matter.

  Further, in the embodiment, holes 91B, 91C, 91D, 91E having different diameters are formed in the upper cylinder (first cylinder) 38 and the intermediate partition plate 36, but not limited thereto, holes having different diameters are formed in the upper support member 54. A plurality of may be formed.

DESCRIPTION OF SYMBOLS 10 Rotary compressor 12 Airtight container 14 Electric element 16 Rotating shaft 18 Rotation compression mechanism part 32 1st rotation compression element 34 2nd rotation compression element 36 Intermediate partition plate 38 Upper cylinder (2nd cylinder)
40 Lower cylinder (first cylinder)
54 Upper support member (occlusion member)
56 Lower support member 62 Discharge silencer chamber (discharge chamber)
65 Gasket 66 Upper cover 70 Discharge passage 72 Discharge valve 90 Oil separation mechanism (oil separation means)
91 Space part 91A-91E Hole 95 Refrigerant introduction part 97 Refrigerant outlet part 98 Fine hole (oil outflow part)
105 Current plate

Claims (8)

In a rotary compressor formed by housing an electric element and a rotary compression mechanism unit driven by a rotating shaft of the electric element in a sealed container,
The rotary compression mechanism unit is configured to include oil separation means for centrifuging oil in the refrigerant compressed and discharged by the rotary compression mechanism unit,
The oil separating means communicates in the space portion on the center axis of the space portion, a cylindrical space portion whose center axis is set in the vertical direction, a refrigerant introduction portion for introducing the refrigerant into the space portion, and the space portion. The refrigerant outlet portion and an oil outflow portion communicating with the lower end of the space portion are provided, and the space portion is constituted by a plurality of cylindrical holes having different inner diameters, and the inner diameter of each hole is smaller as it is lower. Rotary compressor characterized by The rotary compression mechanism has a cylinder having a compressor in which the refrigerant is compressed, and a closing member having a discharge chamber for discharging the refrigerant compressed in the cylinder and closing the compression chamber. And
The space portion of the oil separating means is formed from the closing member to the cylinder, and an inner diameter of the hole of the cylinder portion is smaller than an inner diameter of the hole of the closing member portion. Item 2. The rotary compressor according to Item 1.   The rotary compressor according to claim 2, wherein the space portion of the cylinder portion and / or the closing member portion is configured by a plurality of the holes. A discharge valve disposed in the discharge chamber;
A refrigerant discharge pipe connected to the sealed container;
A discharge passage formed in the closing member, communicating with the discharge chamber and the refrigerant discharge pipe, and discharging the refrigerant discharged into the discharge chamber to the outside without passing through the sealed container; ,
4. The rotary compressor according to claim 2, wherein the oil separation unit is configured to be interposed between the discharge valve and the discharge passage. 5.   The rotary compression mechanism unit includes first and second rotary compression elements, discharges the refrigerant compressed by the first rotary compression element into the sealed container, and discharges the refrigerant discharged into the sealed container. The rotary compressor according to claim 4, wherein the rotary compressor is compressed by the cylinder constituting the second rotary compression element and discharged to the discharge chamber. The discharge chamber is composed of a recess formed on the upper surface of the closing member, and a cover for closing the upper surface opening of the recess,
The rotary compressor according to any one of claims 2 to 5, wherein the refrigerant lead-out portion of the oil separation means is configured by a groove formed in the lower surface of the cover.   The rotary compressor according to claim 6, wherein a rectifying plate is disposed in the refrigerant outlet portion. A gasket interposed between the closing member and the cover;
The rotary compressor according to claim 6, wherein the communication portion between the refrigerant outlet portion and the space portion is narrowed by the gasket in a state where the gasket is opened in the space portion on the central axis of the space portion.

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