JP4307945B2 - Horizontal rotary compressor - Google Patents

Description

  The present invention relates to a horizontal rotary compressor including a driving element in a hermetic container, and a rotary compression mechanism unit including first and second rotary compression elements driven by the drive element.

  Conventionally, in this type of rotary compressor, for example, an internal intermediate pressure type multi-stage (two-stage) compression rotary compressor provided with first and second rotary compression elements, a drive element and a rotation driven by the drive 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 and is compressed by the operation of the roller and the vane to become an intermediate pressure from the high pressure chamber side of the cylinder through the discharge port and the discharge silencer chamber. It is discharged into a closed 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 discharged from the high-pressure chamber side through the discharge port and discharge silencer chamber to the outside of the compressor.

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 of the rotating shaft and supplied to the sliding portion of the rotary compression mechanism. Lubrication and sealing are performed (see, for example, Patent Document 1).
Japanese Patent No. 25007047

  By the way, when such a rotary compressor is used as a horizontal type, the oil supplied to the first rotary compression element is dissolved in the refrigerant gas compressed by the first rotary compression element. Not only on the pump side, but also on the bottom of the sealed container on the electric element side. For this reason, there is a fear that oil cannot be smoothly sucked by the oil pump configured at the end of the rotary shaft on the rotary compression mechanism portion side.

  The oil mixed in the refrigerant gas compressed by the first rotary compression element is discharged into the sealed container and separated to some extent from the refrigerant gas in the process of moving through the space in the sealed container. The oil mixed in the refrigerant gas compressed by the 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, the oil cannot be sucked smoothly by the oil pump, and the sliding performance and the sealing performance are deteriorated. Furthermore, 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.

  In order to prevent oil discharge outside the compressor as described above, an oil separator is connected to the refrigerant discharge pipe to separate the oil from the discharged refrigerant gas and return it to the compressor, but the installation space is expanded. There was a problem such as.

A horizontal rotary compressor according to a first aspect of the present invention comprises a sealed element containing a drive element and a rotary compression mechanism driven by the drive element, and is provided in an oil reservoir at the bottom of the sealed container. An oil supply means for supplying oil to the rotary compression mechanism, etc., an oil separation means provided in the sealed container for centrifuging the oil in the refrigerant discharged from the rotary compression mechanism, and the oil separation means An oil passage for returning the separated oil to the oil sump, a baffle plate for dividing the inside of the sealed container into a drive element side and a rotary compression mechanism part side to constitute a differential pressure, and an oil sump, A small-diameter passage that communicates the drive element side of the baffle plate and the rotary compression mechanism portion side is provided, and the oil supply means is provided on the rotary compression mechanism portion side of the baffle plate. compression The refrigerant, which is composed of raw material and is compressed by the first rotary compression element, is discharged into the sealed container, and the refrigerant in the sealed container is sucked and compressed by the second rotary compression element. The compressed refrigerant is discharged to the drive element side of the baffle plate, and the outlet of the oil passage is directed from the drive element side of the baffle plate to the small diameter passage .

According to the first aspect of the invention, the oil can be effectively separated from the refrigerant compressed by the second rotary compression element by the oil separation means . As a result, the amount of oil discharged from the compressor can be significantly reduced.

The oil separated by the oil separation means is pushed out from the oil passage by the refrigerant gas in the oil separation means. Therefore, by passing the oil separated by the oil separating means through the small diameter passage by using the speed pushed out by the refrigerant gas in the oil separating means, the small diameter passage acts like an ejector pump, and the baffle plate The oil in the oil reservoir on the drive element side can also be entrained and moved to the rotary compression mechanism portion side.

  As a result, the oil level of the oil reservoir on the rotary compression mechanism portion side of the baffle plate can be raised.

  In order to solve the technical problem, an object of the present invention is to provide a horizontal rotary compressor that can reduce the amount of oil discharged to the outside and can smoothly supply oil to a rotary compression mechanism and the like. To do. Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 shows a longitudinal sectional view of an internal intermediate pressure type multi-stage (two-stage) compression rotary compressor 10 having first and second rotary compression elements 32 and 34 as an embodiment of a horizontal rotary compressor of the present invention. Yes.

In FIG. 1, reference numeral 10 denotes an internal intermediate pressure multistage compression horizontal rotary compressor using carbon dioxide (CO ₂ ) as a refrigerant. The rotary compressor 10 includes a horizontal cylindrical sealed container 12 made of a steel plate, and the sealed container 12. The electric element 14 as a drive element disposed and housed in the internal space of the electric element 14, the first rotary compression element 32 (first stage) and the second rotary compression element 34 (2) driven by the rotary shaft 16 of the electric element 14 The rotary compression mechanism 18 is composed of a stage).

  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 substantially bowl-shaped end cap (sealed lid) 12B that closes the 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 end cap 12B.

  The electric element 14 includes a stator 22 that is annularly attached along the inner peripheral surface of the hermetic container 12 and a rotor 24 that is inserted and installed inside the stator 22 with a slight gap. The rotor 24 is fixed to a rotating shaft 16 that passes through the center and extends in the axial direction (lateral 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. The rotor 24 is also formed of a laminated body 30 of electromagnetic steel plates, like the stator 22, and is configured by inserting a permanent magnet MG into the laminated body 30.

  An oil pump 103 as an oil supply means is formed on the opposite side of the first and second rotary compression elements 32, 34 from the electric element 14, that is, on the end of the rotary shaft 16 on the rotary compression mechanism 18 side. Yes. The oil pump 103 is provided to suck up lubricating oil from an oil reservoir 13 formed at the bottom of the sealed container 12 and supply the oil to the sliding portion of the rotary compression mechanism 18 to prevent wear. The oil suction pipe 104 descends from the oil pump 103 toward the bottom of the hermetic container 12 and is opened at the oil reservoir 13.

  The first and second rotary compression elements 32 and 34 have a phase difference of 180 degrees with the cylinders 38 and 40 arranged on both sides (left and right in FIG. 1) of the intermediate partition plate 36, respectively. Rollers 46 and 48 that are fitted into the eccentric portions 42 and 44 and rotate eccentrically in the cylinders 38 and 40, and abut against the rollers 46 and 48, respectively, and the cylinders 38 and 40 are respectively in the low pressure chamber side and the high pressure. The vanes 50 and 52 partitioned on the chamber side, the opening surface of the cylinder 38 on the electric element 14 side, and the opening surface of the cylinder 40 opposite to the electric element 14 (the oil pump 103 side) are respectively closed to close the rotating shaft 16. It comprises support members 54 and 56 that also serve as bearings.

  The support member 54 and the support member 56 have a suction passage (not shown) communicating with the inside of the cylinders 38 and 40 through a suction port (not shown), and a part thereof is recessed, and the recessed portion is closed with a cover 66 and a cover 68. Discharge silencer chambers 62 and 64 defined by the operation are provided. Further, bearings 54A and 56A are formed at the centers of the support member 54 and the support member 56, respectively, and support the rotating shaft 16.

  A baffle plate 100 is formed on the outer peripheral surface of the cover 66. The baffle plate 100 is made of a steel plate having a donut shape, and is fixed by welding a connection portion with the cover 66. The baffle plate 100 is close to the inner surface of the hermetic container 12 at almost the entire circumference, and a gap through which refrigerant gas can pass is formed between the electric element 14 side and the rotary compression mechanism portion 18 side. Yes.

  The intermediate-pressure refrigerant gas compressed by the first rotary compression element 32 and discharged to the electric element 14 side in the sealed container 12 is between the outer peripheral edge of the baffle plate 100 and the inner peripheral surface of the sealed container 12. However, due to the presence of the baffle plate 100, the pressure on the electric element 14 side of the baffle plate 100 is high in the sealed container 12, and the rotary compression mechanism unit 18 side rotates. A low differential pressure is configured on the compression mechanism portion 18 side.

  In addition, as shown in FIG. 2, pores 101 are formed in the lower part of the baffle plate 100. The pore 101 is located in the oil reservoir 13 in the sealed container 12 and penetrates the baffle plate 100 in the axial direction (lateral direction). Further, since the pore 101 is immersed in the oil in the oil reservoir 13, it does not affect the above-described differential pressure.

  A small diameter passage 55 is formed in the support member 54 adjacent to the pore 101 of the baffle plate 100 so as to penetrate the support member 54 in the axial direction (lateral direction). The small-diameter passage 55 is a passage that connects the electric element 14 side of the baffle plate 100 and the rotary compression mechanism portion 18 side, and is a pore formed in the baffle plate 100 adjacent to the electric element 14 side of the support member 54. It is formed at a position substantially corresponding to 101.

  The baffle plate 100 side (electric element 14 side) of the small diameter passage 55 has substantially the same diameter as the pore 101 and gradually becomes narrower from here toward the rotary compression mechanism portion 18 side. It has a shape in which the diameter is minimum near the approximate center and gradually increases from there toward the rotary compression mechanism 18 side. The small-diameter passage 55 is also located in the oil reservoir 13 in the sealed container 12 and is immersed in the oil in the oil reservoir 13 in the same manner as the pore 101 of the baffle plate 100. It has no effect on the composition of

  Here, the cover 66 is made of a steel plate, and has a substantially donut shape in which a hole through which the shaft 54 and the bearing 54A of the support member 54 penetrate is formed at the center. Further, since the cover 66 has an intermediate pressure inside the sealed container 12, the cover 66 is formed thick to prevent the high temperature and high pressure refrigerant discharged into the discharge silencer chamber 62 from leaking into the sealed container 12. Strength is raised. In particular, when carbon dioxide is used as the refrigerant as in the present embodiment, the pressure difference between the sealed container 12 and the discharge silencer chamber 62 becomes larger, so that the cover 66 has a certain degree of rigidity (thickness). This avoids inconvenience that the high-temperature and high-pressure refrigerant leaks into the sealed container 12.

  In addition, an oil separation mechanism 110 serving as an oil separation means that centrifuges the oil in the discharged refrigerant that is compressed by the second rotary compression element 34 is provided in the upper portion of the cover 66 that is formed thick. It has been. The oil separation mechanism 110 is formed in a cover 66 positioned above the rotating shaft 16. The oil separation mechanism 110 is formed in a vertically long cylindrical shape in the cover 66, and has a space portion 111 having an open top surface, the space portion 111, and a discharge silencer chamber. A communication hole 112 that communicates with 62 and an opening 113 formed below the space 111.

  And the oil separation mechanism 110 is formed by inserting the refrigerant | coolant discharge pipe 96 formed in the magnitude | size substantially the same as the internal diameter of the said space part 111 from the opening part of the upper surface of the space part 111, and welding a connection location. . The refrigerant discharge pipe 96 has a distal end portion 96A having a predetermined length and a smaller pipe thickness than other portions, and the distal end portion 96A is open downward. Further, a gap is formed between the space portion 111 and the tip end portion 96 </ b> A of the refrigerant discharge pipe 96. The communication hole 112 is located in the support member 54 substantially corresponding to the upper end of the tip end portion 96 </ b> A, and is formed so that the refrigerant from the discharge silencing chamber 62 is discharged toward the outer wall surface of the tip end portion 96 </ b> A of the refrigerant discharge pipe 96. Has been.

  In addition, the lower side of the space 111 has a substantially conical shape that gradually decreases toward the opening 113. An oil hole 115 of an oil passage 114 having a diameter substantially the same as that of the opening 113 is formed below the opening 113 of the oil separation mechanism 110. The oil passage 114 is a passage for returning the oil separated by the oil separation mechanism 110 to the oil sump 13 formed in the lower part of the sealed container 12, and includes an oil hole 115 formed in the cover 66, The communication pipe 116 is used.

  The oil hole 115 communicates with the oil separation mechanism 110 at the opening 113 as described above, and opens at the lower surface of the cover 66. A communication pipe 116 is connected to the opening on the lower surface, and is attached by fixing the connection with the cover 66 by welding or the like. The outlet of the communication pipe 116 of the oil passage 114 opens into the oil reservoir 13 at the bottom of the hermetic container 12 and is directed to the oil pump 103 side.

  That is, in this embodiment, the outlet of the communication pipe 116 of the oil passage 114 is directed from the electric element 14 side of the baffle plate 100 to the small diameter passage 55, and the oil from the oil passage 114 has the pore 101 and the small diameter passage. The baffle plate 100 is configured so as to easily move to the rotary compression mechanism portion 18 side (oil pump 103 side).

  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, which is a support member 56, a support member 54, a cover 66, cylinders 38, 40, It is a hole (not shown) that penetrates the partition plate 36. In this case, an intermediate discharge pipe 121 is formed at the end of the communication path, and an intermediate pressure refrigerant is discharged from the intermediate discharge pipe 121 to the electric element 14 side of the baffle plate 100 in the sealed container 12.

In addition, as oil as lubricating oil enclosed in the airtight container 12, existing oils, such as mineral oil (mineral oil), alkylbenzene oil, ether oil, ester oil, PAG (polyalkylene glycol), are used, for example. As the refrigerant, the aforementioned carbon dioxide (CO ₂ ), which is a natural refrigerant, is used in consideration of flammability, toxicity, and the like that are friendly to the global environment.

  Below the support member 54 on the side surface of the hermetic container 12 and above the opposite side of the rotary compression mechanism 18 from the electric element 14 (a position substantially corresponding to the top of the oil pump 103), below the support member 56, and above the cover 66. The refrigerant introduction pipe 92, the refrigerant introduction pipe 94, and the refrigerant discharge pipe 96 are inserted and connected through positions not shown in the drawings.

  Next, the operation of the rotary compressor 10 with 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 rollers 46 and 48 fitted to the eccentric portions 42 and 44 provided integrally with the rotary shaft 16 are eccentrically rotated in the cylinders 38 and 40.

  As a result, the refrigerant gas sucked into the low pressure chamber side of the cylinder 40 of the first rotary compression element 32 from the refrigerant introduction pipe 94 through a suction passage and a suction port (not shown) is compressed by the operation of the roller 48 and the vane 52. After being discharged from the high pressure chamber side of the cylinder 40 through the discharge port to the discharge silencer chamber 64, the pressure is discharged from the intermediate discharge pipe 121 to the electric element 14 side of the baffle plate 100 in the sealed container 12 through the communication path. The Thereby, the inside of the airtight container 12 becomes an intermediate pressure.

  The intermediate-pressure refrigerant gas discharged to the electric element 14 side of the baffle plate 100 in the sealed container 12 passes through a gap formed between the outer peripheral edge of the baffle plate 100 and the inner peripheral surface of the sealed container 12. The baffle plate 100 flows into the rotary compression mechanism 18 side.

  At this time, the pressure on the electric element 14 side of the baffle plate 100 due to the action that the refrigerant gas passes through a gap formed between the outer peripheral edge of the baffle plate 100 in the sealed container 12 and the inner peripheral surface of the sealed container 12. The differential pressure is high and the pressure on the rotary compression mechanism 18 side of the baffle plate 100 is low. Due to this differential pressure, the oil in the sealed container 12 easily flows into the rotary compression mechanism 18 side of the baffle plate 100.

  Further, the intermediate-pressure refrigerant gas flowing into the rotary compression mechanism 18 passes through a refrigerant introduction pipe 92 connected to the upper side of the oil pump 103 on the side surface of the hermetic container 12 and is formed in a suction passage (not shown) formed in the support member 54. The air is sucked into the low pressure chamber side of the cylinder 38 through the suction port.

  Then, the second stage compression is performed by the operation of the roller 46 and the vane 50 to form a high-temperature and high-pressure refrigerant gas, which is discharged from the high-pressure chamber side to a discharge silencer chamber 62 formed in the support member 54 through a discharge port (not shown). After that, the oil is separated from the communication hole 112 of the oil separation mechanism 110 into the space 111. At this time, the refrigerant gas and the oil mixed in the refrigerant gas are discharged from the communication hole 112 to the outer wall surface of the distal end portion 96A of the refrigerant discharge pipe 96 in the space 111, and the discharged refrigerant gas and oil are discharged. Due to the momentum, the inside of the space portion 111 is lowered while spiraling around the gap formed between the outer wall surface of the distal end portion 96A and the inner peripheral surface of the space portion 111.

  In this process, the oil mixed in the refrigerant gas is centrifuged from the refrigerant gas and adheres to the outer wall surface of the space portion 111, and is transmitted through the outer wall surface from the opening 113 formed on the lower side of the space portion 111. The oil hole 115 enters the oil passage 114. At this time, since the oil separation mechanism 110 has a high pressure and the sealed container 12 has an intermediate pressure, the separated oil is pushed out from the communication pipe 116 by the high-pressure refrigerant gas in the oil separation mechanism 110.

  Since the communication pipe 116 is directed to the small diameter passage 55 as described above, the extruded oil passes through the small diameter passage 55 through the pore 101 as shown by the arrow in FIG. Move to.

  At this time, the oil from the oil passage 114 passes through the small-diameter passage 55 by using the speed pushed out by the high-pressure refrigerant gas in the oil separation mechanism 110, and thus in the process of passing through the small-diameter passage 55 having a small diameter. Oil is accelerated. As a result, the oil in the oil sump 13 on the electric element 14 side of the baffle plate 100 is also caught and sucked into the small diameter passage 55 from the pore 101. That is, the small-diameter passage 55 acts like an ejector pump, and the oil in the oil reservoir 13 on the electric element 14 side of the baffle plate 100 moves to the rotary compression mechanism portion 18 side of the baffle plate 100 (arrow in FIG. 2).

  Thus, in addition to the effect of the differential pressure by the baffle plate 100, the oil on the electric element 14 side of the baffle plate 100 moves to the rotary compression mechanism portion 18 side due to the ejector effect of the small diameter passage 55. The oil level of the oil reservoir 13 on the 18 side increases. Accordingly, the opening of the oil suction pipe 104 is immersed in the oil without any trouble, so that the oil is smoothly supplied to the sliding portion of the rotary compression mechanism portion 18 by the oil pump 103. .

  On the other hand, the refrigerant gas enters the refrigerant discharge pipe 96 from the refrigerant discharge pipe 96 opened to the lower side of the space portion 111 and is discharged to the outside of the compressor 10.

  In this way, by discharging the refrigerant gas compressed by the second rotary compression element 34 to the oil separation mechanism 110, the oil mixed in the refrigerant gas can be effectively centrifuged, The oil discharge amount can be significantly reduced. As a result, it is possible to avoid the disadvantage that the compressor 10 is short of oil and the disadvantage that adversely affects the refrigerant circuit.

  As a result, the amount of oil discharged to the outside of the compressor 10 can be reduced, and the oil can be smoothly supplied to the sliding portion of the compressor 10 to improve the performance and reliability of the compressor 10. It becomes possible to plan.

  Further, by providing the oil separation mechanism 110 in the cover 66 of the second rotary compression element 34 formed with a large thickness, it is possible to avoid an increase in the overall length of the compressor. Thereby, size reduction of the compressor 10 can be achieved.

  Similarly, by forming the oil hole of the oil passage 114 communicating with the oil separation mechanism 110 in the cover 66, it is possible to avoid an increase in the overall length of the compressor and to suppress an increase in the number of parts due to the formation of the oil passage 114 as much as possible. It becomes possible to reduce the production cost.

  In the present embodiment, the small-diameter passage is formed in the support member 54. However, the present invention is not limited to this, and the small-diameter passage is formed in the baffle plate 100 or formed in other places in the sealed container 12. It does not matter.

  Further, in the present embodiment, the horizontal rotary compressor 10 has been described using a two-stage compression type rotary rotary compressor including the first and second rotary compression elements 32 and 34. You may apply to the horizontal rotary compressor provided with the compression element, and the multistage compression type horizontal rotary compressor provided with the rotation compression element of 3 stages, 4 stages, or more.

  Further, although carbon dioxide is used as the refrigerant in this embodiment, the refrigerant is not limited thereto, and various refrigerants such as hydrocarbon refrigerants and nitrous oxide can be applied.

It is a longitudinal cross-sectional view of the vertical rotary compressor of this invention. It is a figure which shows the flow of the oil in the oil sump by the side of the electric element of a baffle board.

DESCRIPTION OF SYMBOLS 10 Rotary compressor 12 Airtight container 12A Container main body 12B End cap 13 Oil sump 14 Electric element 16 Rotating shaft 18 Rotation compression mechanism part 20 Terminal 22 Stator 24 Rotor 26 Lamination body 28 Stator coil 30 Lamination body 32 1st rotation compression element 34 1st Rotational compression element 2 36 Intermediate partition plate 38, 40 Cylinder 42, 44 Eccentric part 46, 48 Roller 50, 52 Vane 54, 56 Support member 54A, 56A Bearing 62, 64 Discharge silencer 66, 68 Cover 92, 94 Introduction of refrigerant Pipe 96 Refrigerant discharge pipe 96A Tip part 100 Baffle plate 101 Fine hole 103 Oil pump 104 Oil suction pipe 110 Oil separation mechanism 111 Space part 112 Communication hole 113 Opening part 114 Oil passage 115 Oil hole 116 Communication pipe

Claims (1)

In a horizontal rotary compressor in which a driving element and a rotary compression mechanism driven by the driving element are housed in an airtight container,
Oil supply means for supplying the oil in the oil reservoir at the bottom of the sealed container to the rotary compression mechanism and the like;
An oil separating means provided in the sealed container for centrifuging oil in the refrigerant discharged from the rotary compression mechanism;
An oil passage for returning the oil separated by the oil separation means to the oil reservoir ;
A baffle plate for dividing the inside of the sealed container into the drive element side and the rotary compression mechanism part side to constitute a differential pressure;
A small-diameter passage located in the oil sump and communicating the drive element side of the baffle plate and the rotary compression mechanism portion side;
The oil supply means is provided on the baffle plate on the rotary compression mechanism portion side, the rotary compression mechanism portion includes first and second rotary compression elements, and the refrigerant compressed by the first rotary compression element is It is discharged into a sealed container, and the refrigerant in this sealed container is sucked and compressed by the second rotary compression element,
The refrigerant compressed by the first rotary compression element is discharged to the drive element side of the baffle plate, and the outlet of the oil passage is directed from the drive element side of the baffle plate to the small diameter passage. This is a horizontal rotary compressor.

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