JP2015068262A - Rotary compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary compressor capable of solving a problem that oil is excessively supplied to a second rotary compression element, by a simple structure.SOLUTION: A rotary compressor includes: an intermediate partitioning plate 36 for partitioning rotary compression elements 32 and 34; an oil hole 13 formed on a rotary shaft 16; a through-hole 131 formed on the intermediate partitioning plate 36, and opening to the oil hole 13 side on the inner side and on a sealed container 12 side on the outer side; and a communication hole 133 for communicating the through-hole 131 and a suction side of the second rotary compression element 34. The through-hole 131 is composed of a small diameter hole portion 131A on the oil hole 13 side, and a large diameter hole portion 131B having a diameter larger than that of the small diameter hole portion 131A on the sealed container 12 side. The communication hole 133 communicates with the small diameter hole portion 131A.

Description

  The present invention includes first and second rotary compression elements driven by a rotary shaft of a drive element in a sealed container, and discharges refrigerant gas compressed by the first rotary compression element into the sealed container, Further, the present invention relates to a rotary compressor that compresses the discharged refrigerant gas having an intermediate pressure by a second rotary compression element.

  In a conventional rotary compressor of this type, particularly an internal intermediate pressure type multistage compression type rotary compressor, refrigerant gas is drawn into the low pressure chamber side of the cylinder from the suction port of the first rotary compression element, and is compressed by the operation of the roller and vane. Intermediate pressure is then discharged from the high pressure chamber side of the cylinder through the discharge port and discharge silencer chamber into the 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 The refrigerant gas is configured to flow from the high-pressure chamber side to the external radiator or the like through the discharge port and the discharge silencer chamber (see, for example, Patent Document 1).

  In addition, a vertical oil hole and a lateral oil supply hole communicating with the oil hole are formed in the center of the rotary shaft, and sealed by an oil pump (oil supply means) attached to the lower end of the rotary shaft. Oil was pumped up from the oil reservoir at the bottom of the container, and the oil hole was raised. The oil was supplied from the oil supply hole to the sliding part in the rotary shaft and the rotary compression element to perform lubrication and sealing.

When a refrigerant having a large high-low pressure difference, such as carbon dioxide (CO ₂ ), which is a natural refrigerant, is used as the refrigerant for the rotary compressor, the refrigerant pressure reaches 12 MPaG in the second rotary compression element having a high pressure, The first rotary compression element on the side is 8 MPaG (intermediate pressure).

JP 2004-108165 A

  Here, in such a rotary compressor, the pressure (high pressure) in the cylinder of the second rotary compression element is higher than the pressure (intermediate pressure) in the sealed container whose bottom is an oil reservoir. It becomes extremely difficult to supply oil into the cylinder of the second rotary compression element using the pressure difference from the oil hole or oil supply hole of the shaft, and it is lubricated exclusively by the oil dissolved in the suction refrigerant. It was.

  Therefore, conventionally, a through-hole penetrating from the oil hole side of the rotary shaft to the outer sealed container side is formed in the intermediate partition plate that partitions each rotary compression element, and the cylinder constituting the second rotary compression element is penetrated by this through-hole. A communication hole that connects the hole and the suction side of the second rotary compression element is formed, and oil is supplied from the oil hole to the suction side of the second rotary compression element using the suction pressure loss in the suction process. .

  However, since a through hole having a relatively large diameter that is easy to process has been conventionally formed, there has been a problem that oil is excessively supplied to the second rotary compression element.

  The present invention has been made in order to solve the conventional technical problem, and a rotary compressor capable of eliminating the disadvantage that oil is excessively supplied to the second rotary compression element with a simple configuration. It is to provide.

  In order to solve the above-described problems, a rotary compressor according to the present invention includes first and second rotary compression elements driven by a rotary shaft of a drive element in a sealed container, and is compressed by the first rotary compression element. The refrigerant gas discharged into the sealed container, and further, the discharged intermediate-pressure refrigerant gas is compressed by the second rotary compression element, each of which constitutes each rotary compression element, A roller provided in the cylinder and fitted in the eccentric part of the rotary shaft to rotate eccentrically, an intermediate partition plate that is interposed between each cylinder and each roller and partitions each rotary compression element, and an opening surface of each cylinder A support member that is respectively closed and has a bearing for the rotary shaft, an oil hole formed in the rotary shaft, a through hole formed in the intermediate partition plate and opened to the inner oil hole side and the outer sealed container side; Formed on the intermediate partition plate A through hole for communicating the through hole with the suction side of the second rotary compression element, the through hole having a small diameter hole portion on the oil hole side and a large diameter larger in diameter than the small diameter hole portion on the sealed container side The communication hole is characterized in that it communicates with the small-diameter hole.

  The rotary compressor according to a second aspect of the invention is characterized in that the diameter of the small diameter portion is 10% or more and 80% or less with respect to the diameter of the large diameter portion.

  A rotary compressor according to a third aspect of the present invention is characterized in that, in each of the above inventions, the length of the small diameter portion is 10% or more and 90% or less with respect to the entire length of the through hole.

  According to the present invention, in a so-called internal intermediate pressure type multi-stage compression type rotary compressor, a cylinder for constituting each rotary compression element, and a rotational rotation element provided in each cylinder and fitted to an eccentric part of a rotary shaft are rotated eccentrically. Formed on the rotating shaft, a support member having a bearing for the rotating shaft, and an intermediate partition plate that is interposed between each cylinder and each roller to partition each rotating compression element, closes the opening surface of each cylinder, and The oil hole formed in the intermediate partition plate, the through hole opening to the inner oil hole side and the outer sealed container side, the intermediate partition plate, the through hole and the second rotary compression element A through hole for communicating with the suction side, and the through hole is composed of a small-diameter hole portion on the oil hole side and a large-diameter hole portion having a diameter larger than the small-diameter hole portion on the sealed container side. Because it is connected to the small-diameter hole, The oil hole of the shaft and the suction side of the second rotary compression element are communicated with each other through the small-diameter hole portion of the through hole and the communication hole, and the amount of oil flowing into the suction side of the second rotary compression element is limited. Thus, excessive oil supply to the second rotary compression element can be eliminated.

  In addition, a large-diameter hole is opened in the sealed container, and the refrigerant in the sealed container smoothly flows into the through-hole from the large-diameter hole and enters the communication hole. Also, the amount of oil to the second rotary compression element is effectively limited by the refrigerant from.

  In this case, as in the inventions of claim 2 and claim 3, the diameter of the small diameter portion is set to 10% or more and 80% or less with respect to the diameter of the large diameter portion, and the length of the small diameter portion is set to the entire length of the through hole. With respect to 10% or more and 90% or less, it is possible to eliminate excessive oil supply to the second rotary compression element and to appropriately control the refrigerant in the sealed container over the large diameter portion. Become.

It is a vertical side view of the internal intermediate pressure type multistage compression rotary compressor of the embodiment to which the present invention is applied. It is a top view of the intermediate partition plate of the rotary compressor of FIG. It is a vertical side view of the intermediate partition plate of the rotary compressor of FIG.

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

In FIG. 1, reference numeral 10 denotes an internal intermediate pressure multistage compression rotary compressor that uses carbon dioxide (CO ₂ ) as a refrigerant. The rotary compressor 10 includes a cylindrical sealed container 12 made of a steel plate, and an interior of the sealed container 12. The electric element 14 as a driving element arranged and housed on the upper side of the space, and a first rotary compression element 32 (first stage) arranged below the electric element 14 and driven by the rotating shaft 16 of the electric element 14 And a rotary compression mechanism section 18 including a second rotary compression element 34 (second stage). In addition, the volume of the 1st rotary compression element 32 of the rotary compressor 10 of a present Example is larger than the volume of the 2nd rotary compression element 34 used as the 2nd stage.

  The sealed container 12 has an oil sump OL at the bottom, a container main 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 main body 12A. A circular mounting hole 12D is formed at the center of the upper surface of the end cap 12B, and a terminal (wiring is omitted) 20 for supplying power to the electric element 14 is formed in the mounting hole 12D. Is attached.

  The electric element 14 includes a stator 22 that is annularly attached along the inner peripheral surface of the upper space of the hermetic container 12, and a rotor 24 that is inserted and arranged with a slight gap inside the stator 22. This is a direct-winding DC motor, and the rotation speed and torque control are performed by an inverter. The electric element 14 is started by the inverter at a low speed when the rotary compressor is started, and then the rotational speed is controlled so as to be increased to a desired rotational speed. The rotor 24 is fixed to a rotary shaft 16 that passes through the center and extends in the vertical direction.

  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.

  Further, an oil pump 102 as an oil supply means is formed at the lower end portion of the rotating shaft 16. The oil pump 102 sucks up lubricating oil from an oil reservoir OL formed at the bottom of the sealed container 12, and passes through an oil hole 13 formed in the vertical direction at the center of the shaft in the rotary shaft 16. Sliding between the vertical oil supply holes 82 and 84 communicating with the oil hole 13 (also formed in the upper and lower eccentric parts 42 and 44) and the upper and lower eccentric parts 42 and 44 and the first and second rotary compression elements 32 and 34. Oil is supplied to the moving part. As a result, the first and second rotary compression elements 32 and 34 are prevented from being worn and sealed.

  An intermediate partition plate 36 is sandwiched between the first rotary compression element 32 and the second rotary compression element 34. That is, the first rotary compression element 32 and the second rotary compression element 34 include an intermediate partition plate 36, upper and lower cylinders 38 and 40 disposed above and below the intermediate partition plate 36, and the upper and lower cylinders 38 and 40. The upper and lower rollers 46 and 48 are fitted to the upper and lower eccentric portions 42 and 44 provided on the rotating shaft 16 with a phase difference of 180 degrees and rotate eccentrically, and the upper and lower cylinders 38 are in contact with the upper and lower rollers 46 and 48. , 40, which are divided into a low pressure chamber side and a high pressure chamber side, respectively, and an opening surface on the upper side of the upper cylinder 38 and an opening surface on the lower side of the lower cylinder 40 to close the bearing of the rotary shaft 16. An upper support member 54 and a lower support member 56 are used as supporting members.

  The upper support member 54 and the lower support member 56 are formed with suction passages 58 and 60 that communicate with the inside of the upper and lower cylinders 38 and 40 through suction ports 161 and 162, and recessed discharge silencer chambers 62 and 64, respectively. The openings on the side opposite to the cylinders 38 and 40 of both the discharge silencing chambers 62 and 64 are respectively closed by covers. That is, the discharge silence chamber 62 is closed by an upper cover 66 as a cover, and the discharge silence chamber 64 is closed by a lower cover 68 as a cover.

  In this case, a bearing 54 </ b> A is formed upright at the center of the upper support member 54. A bearing 56 </ b> A is formed through the center of the lower support member 56. The rotating shaft 16 is held by a bearing 54A of the upper support member 54 and a bearing 56A of the lower support member 56.

  The lower cover 68 is composed of a donut-shaped circular steel plate, and is fixed to the lower support member 56 from below by main bolts 129 at four peripheral portions. The tip of the main bolt 129 is 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. The communication path includes a lower support member 56, an upper support member 54, an upper cover 66, and upper and lower cylinders. 38 and 40 are holes (not shown) penetrating 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 upper cover 66 defines a discharge silencing chamber 62 that communicates with the inside of the upper cylinder 38 of the second rotary compression element 34 through a discharge port (not shown). The electric element 14 is provided with a space. The upper cover 66 is formed of a substantially donut-shaped circular steel plate in which a hole through which the bearing 54A of the upper support member 54 passes is formed, and the upper support member 54 is surrounded by four main bolts 78 from above. It is fixed to. The tip of the main bolt 78 is screwed into the lower support member 56.

  Here, as shown in FIGS. 2 and 3, the intermediate partition plate 36 has a through hole 131 that communicates the inside of the roller 46 on the inner oil hole 13 side and the outer sealed container 12 side (inside the sealed container 12). Are drilled by drilling. Here, a slight gap is formed between the intermediate partition plate 36 and the rotary shaft 16, and the upper side is the space inside the roller 46 (the space around the eccentric portion 42 inside the roller 46. The communication oil supply hole 82 is located). Further, the gap between the intermediate partition plate 36 and the rotary shaft 16 communicates with the inner side of the roller 48 (the space around the eccentric portion 44 inside the roller 48).

  That is, the through-hole 131 passes through the intermediate partition plate 36 from the oil hole 13 side of the inner rotary shaft 16 to the inner side of the outer sealed container 12, and the oil hole 13 side of the rotary shaft 16 and the inner side of the sealed container are opened. Yes. The through-hole 131 has a small-diameter hole portion 131A (2.2 mm in the embodiment) on the oil hole 13 side (inner side) and a large-diameter hole whose diameter is larger than that of the small-diameter hole portion 131A on the sealed container 12 side (outer side). The portion 131B (3.0 mm in the embodiment) is configured such that the small diameter hole portion 131A opens on the rotating shaft 16 side, and the large diameter hole portion 131B opens in the sealed container 12. The diameter of the large diameter hole 131B is the same as that of the conventional through hole.

  When drilling such a through-hole 131, for example, drills of two types of diameters are prepared, and first, the middle of the intermediate partition plate 36 in the radial direction is drilled from the outside of the intermediate partition plate 36 with a large diameter drill. Cut to part. Thereby, the large-diameter hole 131B is drilled. Next, the drill is changed into one having a small diameter and inserted into the large-diameter hole portion 131B, and the small-diameter hole portion 131A is formed by cutting from the terminal end to the rotating shaft 16 side.

  In addition, a communication hole (vertical hole) 133 extending upward is formed in a portion of the through hole 131 corresponding to the small diameter hole portion 131A. The communication hole 133 is cut from the upper portion of the intermediate partition plate 36 corresponding to the small-diameter hole portion 131A with a very small-diameter drill. Moreover, the diameter is made into a still smaller diameter (1.0 mm in an Example) than the small diameter hole part 131A.

  On the other hand, the upper cylinder 38 is formed with an injection communication hole 134 that allows communication between the communication hole 133 of the intermediate partition plate 36 and the suction port 161 (the suction side of the second rotary compression element 34).

As described above, the opening on the rotating shaft 16 side of the small diameter hole portion 131A of the through hole 131 of the intermediate partition plate 36 communicates with the oil hole 13 via the oil supply holes 82 and 84. As will be described later, since the inside of the sealed container 12 is at an intermediate pressure, it is difficult to supply oil into the upper cylinder 38, which is at a high pressure in the second stage. The oil that has been pumped up from the oil sump OL at the inner bottom 12 of the oil tank 12 rises through the oil holes 13 and exits from the oil supply holes 82 and 84 enters the small-diameter hole 131A of the through hole 131 of the intermediate partition plate 36, and the communication holes 133 and 134 Then, the oil is supplied to the suction side (suction port 161) of the upper cylinder 38.

  In this case, the pressure (suction pressure) on the suction side of the upper cylinder 38 is lower than the pressure on the rotary shaft 16 side of the intermediate partition plate 36 due to suction pressure loss in the suction process. During this period, through the oil hole 13 of the rotating shaft 16, the oil supply holes 82, 84, the small diameter hole portion 131 A of the through hole 131 of the intermediate partition plate 36, the communication hole 133, and the upper cylinder 38 through the communication hole 134. Oil is injected into the tank and refueling is performed.

  However, since the small diameter hole portion 131A has a smaller diameter than the conventional one (the same diameter as the large diameter hole portion 131B), and the communication hole 133 has a smaller diameter than the small diameter hole portion 131A, the second rotational compression is performed. The amount of oil supplied into the upper cylinder 38 of the element 34 will be more limited than before.

  On the other hand, since the large-diameter hole portion 131B of the intermediate partition plate 36 opens into the sealed container 12, the intermediate-pressure refrigerant in the sealed container 12 flows into the through-hole 131 from the opening of the large-diameter hole portion 131B. Then, after passing through a part (short distance) of the small-diameter hole 131A outside the communication hole 133, it flows from the communication hole 133 to the suction side (suction port 161) of the upper cylinder 38. That is, the refrigerant in the sealed container 12 smoothly reaches the communication hole 133 through the large-diameter hole portion 131B having a larger diameter than the small-diameter hole portion 131A, so that the oil amount into the upper cylinder 38 is also limited by this. It becomes a shape.

  As described above, when the electric element 14 is controlled by the inverter, the rotation speed is controlled so that it is started at a low speed when the compressor is started. Even if oil is sucked in from the oil reservoir OL at the bottom, adverse effects due to liquid compression are suppressed.

In this case, the refrigerant is environmentally friendly, uses the carbon dioxide (CO ₂ ) which is a natural refrigerant in consideration of flammability and toxicity, and the oil as the lubricating oil enclosed in the sealed container 12 is For example, existing oils such as mineral oil (mineral oil), alkylbenzene oil, ether oil, ester oil, and PAG (polyalkyl glycol) are used.

  On the side surface of the container main body 12A of the sealed container 12, the suction passages 58, 60 of the upper support member 54 and the lower support member 56, the upper side of the discharge silencer chamber 62, and the upper cover 66 (position substantially corresponding to the lower end of the electric element 14). The sleeves 141, 142, 143, and 144 are fixed by welding at positions corresponding to. The sleeves 141 and 142 are adjacent to each other vertically, and the sleeve 143 is substantially diagonal to the sleeve 141. Further, the sleeve 144 is located at a position shifted by approximately 90 degrees from the sleeve 141.

  One end of a refrigerant introduction pipe 92 for introducing refrigerant gas into the upper cylinder 38 is inserted and connected into the sleeve 141, and one end of the refrigerant introduction pipe 92 is communicated with the suction passage 58 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.

  Also, one end of a refrigerant introduction pipe 94 for introducing refrigerant gas into the lower cylinder 40 is inserted and connected into the sleeve 142, and one end of the refrigerant introduction pipe 94 is communicated with the suction passage 60 of the lower cylinder 40. A refrigerant discharge pipe 96 is inserted and connected into the sleeve 143, and one end of the refrigerant discharge pipe 96 is communicated with the discharge silencer chamber 62.

  Next, the operation of the above configuration will be described. When the stator coil 28 of the electric element 14 is energized from the inverter via the terminal 20 and a wiring (not shown), the electric element 14 is activated and the rotor 24 rotates. The start-up in this case is performed at a low speed as described above, and then the speed is increased. 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 rotate eccentrically in the upper and lower cylinders 38 and 40.

  As a result, the low-pressure (4 MPaG) refrigerant gas sucked from the suction port 162 to the low-pressure chamber side of the lower cylinder 40 via the refrigerant introduction pipe 94 and the suction passage 60 formed in the lower support member 56 is The intermediate pressure (8 MPaG) is compressed by the operation of a vane (not shown) from the high pressure chamber side of the lower cylinder 40 to the discharge port 41, from the discharge silencer chamber 64 formed in the lower support member 56, through the communication passage 63, and from the intermediate discharge pipe 121. It is discharged into the sealed container 12.

  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 passes from the suction port 161 to the low pressure chamber side of the upper cylinder 38. Inhaled.

  On the other hand, when the rotary compressor 10 is activated, oil that has entered from the opening on the closed container 12 side of the large-diameter hole 131B of the through hole 131 passes through the communication hole 133 and the communication hole 134, and the upper cylinder 38 of the second rotary compression element 34 is Inhaled into the low-pressure chamber. The intermediate pressure refrigerant gas and oil sucked into the low pressure chamber side of the upper cylinder 38 are compressed in the second stage by the operation of the roller 46 and a vane (not shown). Therefore, the refrigerant gas becomes a high temperature and a high pressure (12 MPaG).

  In this case, the oil that has entered through the opening on the closed container 12 side of the large-diameter hole 131B of the through-hole 131 is also compressed together with the refrigerant gas at the intermediate pressure, but the rotary compressor 10 is operated at a low speed when activated by the inverter. Since the rotational speed is controlled so that the torque is small, there is almost no influence on the rotary compressor 10 even if oil compression is performed, and normal operation is performed.

  Then, the rotational speed is increased in a predetermined control pattern, and finally the electric element 14 is operated at a desired rotational speed. The oil level during operation is below the through hole 131, but oil is supplied from the small diameter hole 131 </ b> A of the through hole 131 to the suction side of the second rotary compression element 34 through the communication hole 133 and the communication hole 134. Therefore, the shortage of oil in the sliding portion of the second rotary compression element 34 can be avoided.

  As described above, the cylinders 38 and 40 for configuring the rotary compression elements 32 and 34 and the cylinders 38 and 40, respectively, are fitted into the eccentric portions 42 and 44 of the rotary shaft 16 and rotate eccentrically. Rollers 46, 48, intermediate partition plates 36 that partition between the rotary compression elements 32, 34 interposed between the cylinders 38, 40 and the rollers 46, 48, and the oil holes 13 formed in the rotary shaft 16, A through hole 131 formed in the intermediate partition plate 36 and opened to the inner oil hole 13 side and the outer sealed container 12 side, and formed in the intermediate partition plate 36, the through hole 131 and the second rotary compression element 34. In the internal intermediate pressure type multi-stage compression rotary compressor 10 having a communication hole 133 for communicating with the suction side, the through hole 131 is connected to the small diameter hole part 131A on the oil hole 13 side and the closed container 12 side. The large-diameter hole portion 131B having a larger diameter than the radial hole portion 131A and the communication hole 133 communicated with the small-diameter hole portion 131A, so that the oil hole 13 of the rotary shaft 16 and the second rotary compression element 34 are sucked in. Side is communicated with the small-diameter hole portion 131A of the through-hole 131 and the communication hole 133, the amount of oil flowing into the suction side of the second rotary compression element 34 is limited, and the second rotary compression element The excessive oil supply to 34 can be eliminated.

  In addition, a large-diameter hole 131B is opened in the sealed container 12, and the refrigerant in the sealed container 12 smoothly flows into the through-hole 131 from this large-diameter hole 131B and enters the communication hole 133. Therefore, the amount of oil to the second rotary compression element 34 is also effectively limited by the refrigerant from the inside of the sealed container 12.

  In this case, not all the diameters of the through-holes are reduced, but the closed container 12 side has a large-diameter hole portion 131B. Therefore, the deterioration of workability for forming the through-hole 131 in the intermediate partition plate 36 is also minimized. It can be suppressed to the limit. In particular, after the large-diameter hole 131B is drilled from the outside of the intermediate partition plate 36 to the midway portion in the radial direction of the intermediate partition plate 36, the small-diameter hole 131A is drilled from the end of the large-diameter hole 131B. Therefore, two types of drills with different diameters for cutting work are prepared, and after cutting the large-diameter hole 131B from the outside of the intermediate partition plate 36 with a large-diameter drill, the small-diameter drill is It is only necessary to insert into the diameter hole portion 131B and to cut the small diameter hole portion 131A from the end, and the workability is remarkably improved.

  In view of this workability improvement, elimination of excessive supply of oil from the small diameter part 131A to the upper cylinder 38 through the communication hole 133, and appropriate control of the intermediate pressure refrigerant applied to the large diameter part 131B, Depending on the position of the communication part 133 in the small diameter part 131A, the relationship between the total length L1 of the through hole 131, the length L2 and the diameter D1 of the small diameter part 131A, and the diameter D2 of the large diameter part 131B is the same as that of the small diameter part 131A. The diameter D1 is 10% to 80% with respect to the diameter D2 of the large diameter portion 131B, and the length L2 of the small diameter portion 131A is such that the pressure loss is constant with respect to the diameter D1 of the small diameter portion 131A. It is considered that 10% or more and 90% or less with respect to the total length L1 of the through hole 131 is good.

  That is, the diameter D1 of the small diameter part 131A of the through hole 131 is set to 10% or more and 80% or less with respect to the diameter D2 of the large diameter part 131B, and the length L2 of the small diameter part 131A is set to the full length L1 of the through hole 131. On the other hand, by setting it to 10% or more and 90% or less, it is possible to eliminate excessive oil supply to the second rotary compression element 34 and to appropriately control the intermediate pressure refrigerant (in the sealed container 12) applied to the large diameter portion 131B. It can be realized.

  In the present embodiment, the upper side of the gap formed between the intermediate partition plate 36 and the rotating shaft 16 communicates with the inside of the roller 46, and the lower side communicates with the inside of the roller 48. Not only, but only when the upper side of the gap formed between the intermediate partition plate 36 and the rotary shaft 16 communicates with the inside of the roller 46 (when the lower side does not communicate with the inside of the roller 48). good. The inner side of the roller 46 and the inner side of the roller 48 may be partitioned by the intermediate partition plate 36. Even in this case, by forming a hole in the axial direction communicating with the inside of the roller 46 in the middle portion of the small diameter hole portion 131A of the through hole 131 of the intermediate partition plate, the second rotational compression element is formed from the oil supply hole 82. Oil can be supplied to the 32 suction side.

  In this embodiment, the rotary compressor has been described as a two-stage compression rotary compressor including the first and second rotary compression elements. However, the rotary compressor is not limited to this, and the rotary compression elements may be three stages, four stages or more. The present invention can be applied to a multistage compression rotary compressor having a rotary compression element.

OL Oil sump 10 Rotary compressor 12 Sealed container 13 Oil hole 14 Electric element 16 Rotating shaft 18 Rotation compression mechanism 22 Stator 24 Rotor 32 First rotation compression element 34 Second rotation compression element 36 Intermediate partition plates 38 and 40 Cylinder 54 Upper support member 56 Lower support member 82, 84 Oil supply hole 131 Through hole 131A Small diameter hole part 131B Large diameter hole part 133 Communication hole 134 Communication hole

Claims (3)

First and second rotary compression elements driven by the rotary shaft of the drive element are provided in the sealed container, and the refrigerant gas compressed by the first rotary compression element is discharged into the sealed container. In the rotary compressor for compressing the discharged intermediate-pressure refrigerant gas by the second rotary compression element,
A cylinder for constituting each of the rotary compression elements;
A roller provided in each cylinder and fitted in an eccentric portion of the rotary shaft to rotate eccentrically;
An intermediate partition plate that is interposed between the cylinders and the rollers and partitions the rotary compression elements;
A support member that closes the opening surface of each cylinder and has a bearing for the rotating shaft;
An oil hole formed in the rotating shaft;
A through hole formed in the intermediate partition plate and opened to the inner oil hole side and the outer sealed container side;
Formed in the intermediate partition plate, and provided with a communication hole for communicating the through hole and the suction side of the second rotary compression element,
The through-hole is composed of a small-diameter hole portion on the oil hole side and a large-diameter hole portion having a diameter larger than that of the small-diameter hole portion on the closed container side,
The rotary compressor is characterized in that the communication hole communicates with the small diameter hole portion.   2. The rotary compressor according to claim 1, wherein a diameter of the small diameter portion is 10% or more and 80% or less with respect to a diameter of the large diameter portion.   3. The rotary compressor according to claim 1, wherein a length of the small diameter portion is 10% or more and 90% or less with respect to a total length of the through hole.

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