JP2005140371A - Horizontal type multistage compression system rotary compressor and air conditioner for automobile - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To smoothly supply refrigerating machine oil to a sliding part even when a compressor is operated in an inclined state or vibrated state when a so-called internal intermediate pressure type multistage compression system rotary compressor is used horizontally. <P>SOLUTION: A bottom part of a sealed container 2 containing a rotary compression mechanism part 10 having a first stage compression element 20 and a second stage compression element 40, and an electric motor 3 for driving the rotary compression mechanism part 10 is an oil sump 2a. The sealed container 2 includes a baffle plate 70 for dividing an inside of the sealed container 10 into a compressor chamber 71 for housing the rotary compression mechanism part 10, and an electric motor chamber 72 for housing the electric motor 3, and a gap part 80 between the baffle plate 70 and an inner surface of the sealed container 2. Furthermore, a refrigerating machine oil suction pipe 16 of a pump mechanism 15 for pumping the refrigerating machine oil from the oil sump 2a is extended to a periphery of the baffle plate 70 and is opened. A refrigerant distributing hole 73 with a check valve for distributing refrigerant and the refrigerant oil from the electric motor chamber 72 to the compressor chamber 71 may be provided on the baffle plate 70. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a horizontal multi-stage compression rotary compressor in which a rotary compression mechanism portion composed of a first-stage compression element and a second-stage compression element is housed in an airtight container.

As a multi-stage compression rotary compressor using CO ₂ as a refrigerant, a two-stage compression rotary compressor provided with a rotary compression mechanism portion composed of a first-stage compression element and a second-stage compression element, particularly an internal intermediate pressure type 2 A stage compression type rotary compressor is generally used. In this two-stage compression rotary compressor, for example, as disclosed in Patent Document 1, an electric element (electric motor) is arranged in an upper part of a vertical sealed container, and a rotary compression mechanism driven by a rotating shaft of the electric element in a lower part. The parts are arranged. In this compressor, the low-pressure gas refrigerant in the refrigerant circuit is sucked from the suction port of the first rotary compression element (first-stage compression element), and the intermediate-pressure gas refrigerant compressed by the first rotary compression element is supplied to the first rotary compression element. 1 is discharged into the sealed container through the discharge port of the rotary compression element, the discharge silencer chamber, and the like.

  The intermediate-pressure refrigerant gas in the sealed container is sucked into the second rotary compression element (second-stage compression element) and compressed to become a high-temperature and high-pressure refrigerant gas, and the discharge port of the second rotary compression element Then, it is configured to be discharged to the refrigerant circuit through a discharge silencer chamber or the like.

Further, in this vertical rotary compressor, the bottom of the hermetic container located below the rotary compression mechanism is an oil reservoir (oil reservoir), and the oil reservoir is formed from the oil reservoir by the lower end of the rotary shaft. Oil (refrigerator oil) was sucked and supplied to the rotary compression mechanism and the sliding part of the rotary shaft.
JP 2000-105005 A

By the way, when such a multistage compression rotary compressor is used as a horizontal type, the oil discharged into the hermetic container together with the refrigerant gas compressed by the first rotary compression element is not only the rotary compression mechanism section side, It also collects at the bottom of the sealed container on the electric element side. Further, when the compressor is inclined to the electric element side, the oil on the rotary compression mechanism part side easily flows to the electric element side, and the oil on the important rotary compression mechanism part side tends to be insufficient. When the oil on the rotary compression mechanism portion side is insufficient, there is a problem that oil cannot be smoothly sucked by the oil supply means configured at the end of the rotary shaft on the rotary compression mechanism portion side.
Also, when the compressor is operated with vibrations applied, if the oil level of the refrigerating machine oil fluctuates up and down and the opening of the refrigerating machine oil suction pipe is not sufficiently immersed in the oil, There is a risk that sufficient suction cannot be performed.

  The present invention has been made to solve such a technical problem. In a so-called internal intermediate pressure type multistage compression rotary compressor, the compressor is operated in an inclined or oscillating state. The purpose of the present invention is to smoothly supply the refrigerating machine oil to the sliding portion.

  The second-stage rotary compression element according to the present invention achieves the above-described object, and includes a sealed container in which an oil reservoir for storing refrigerating machine oil is formed at the bottom, a first-stage compression element, and a second-stage compression element. A rotary compression mechanism portion comprising: an electric motor disposed on the side of the rotary compression mechanism portion so as to drive the rotary compression mechanism portion directly connected to the rotary shaft; and a rotary compression mechanism portion side of the rotary shaft. The rotary compression mechanism is arranged between the pump mechanism provided at the end, the refrigeration oil suction pipe connected to the pump mechanism for pumping the refrigeration oil from the oil reservoir, and the rotary compression mechanism and the electric motor. A baffle plate that divides the inside of the sealed container into a compressor chamber that houses the mechanism section and an electric motor chamber that houses the motor, and a gap formed between the outer peripheral end surface of the baffle plate and the inner peripheral surface of the sealed container The first stage compression element has a discharge gas refrigerant. The compressor is formed so as to be discharged into a motivation chamber, the second-stage compression element is formed so as to suck the gas refrigerant in the compressor chamber, and the refrigerator oil suction pipe is a compressor having an oil reservoir at its tip opening. It arrange | positions in the baffle board vicinity in a chamber, It is characterized by the above-mentioned.

  In the above invention, the baffle plate includes a refrigerating machine oil circulation hole through which the refrigerating machine oil is circulated, and a check valve that prevents a reverse flow of the refrigerating machine oil from the compressor chamber to the electric motor chamber in the refrigerating machine oil circulation hole. It may be provided.

  An automotive air conditioner according to the present invention includes the horizontal multistage compression rotary compressor and uses a carbon dioxide refrigerant as a refrigerant.

  A horizontal multi-stage compression rotary compressor according to the present invention is formed between a baffle plate that divides a sealed container into a compressor chamber and a motor chamber, and an outer peripheral end surface of the baffle plate and an inner peripheral surface of the sealed container. And a discharge gas refrigerant discharged from the first stage compression element is discharged into the motor chamber, and gas refrigerant flowing from the motor chamber into the compressor chamber is sucked into the second stage compression element. Therefore, the pressure in the electric motor chamber can be maintained higher than the compressor chamber pressure, and thereby the oil level in the compressor chamber can be raised. In addition, since the opening at the tip of the refrigerating machine oil suction pipe of the pump mechanism provided at the end of the rotary compression mechanism portion of the electric motor is disposed in the vicinity of the baffle plate of the oil reservoir, the compressor is disposed on the electric motor side. Even when inclined in the direction, the opening at the tip of the refrigerator oil suction pipe can be easily maintained below the oil level. Also, the oil level fluctuates up and down even in applications where strong vibrations are applied to the compressor from outside, but in such a case as well, the opening at the tip of the refrigerating machine oil suction pipe can be easily maintained below the oil level.

  In addition, in the lower part of the baffle plate, when a refrigerating machine oil circulation hole for circulating the refrigerating machine oil and a check valve for preventing a reverse flow of the refrigerating machine oil from the compressor room to the motor room in the refrigerating machine oil circulation hole, When the oil level on the motor chamber side rises, the refrigeration oil in the motor chamber easily moves to the compressor chamber side. Further, the refrigerating machine oil once moved to the compressor side does not return to the motor chamber side through the refrigerating machine oil circulation hole. For this reason, it becomes easier to maintain more refrigerator oil on the compressor chamber side. Therefore, when comprised in this way, the inclination range which can be used of a compressor, and the vibration state which can be endured can be expanded more.

  In addition, the automobile air conditioner according to the present invention uses a horizontal multi-stage compression rotary compressor that can be used in an inclined state or a vibration state as described above. It is possible to provide a horizontal multi-stage compression rotary compressor suitable for a commercial air conditioner. In addition, since a carbon dioxide refrigerant is used as the refrigerant, it is possible to provide an automotive air conditioner excellent in global environmental conservation.

  Next, an embodiment in which the present invention is embodied in a horizontal two-stage compression rotary compressor will be described in detail with reference to the drawings. FIG. 1 is a longitudinal side view of a horizontal two-stage compression rotary compressor according to an embodiment of the present invention, FIG. 2 is a plan sectional view of the horizontal two-stage compression rotary compressor, and FIG. It is a side view of the baffle board in a stage compression type rotary compressor.

A horizontal two-stage compression rotary compressor 1 according to this embodiment is an internal intermediate pressure type horizontal two-stage compression rotary compressor using carbon dioxide (CO ₂ ) as a refrigerant, and includes a hermetic container 2. The bottom of this is the oil reservoir 2a. In the sealed container 2, an electric motor 3 and a rotary compression mechanism unit 10 that is directly connected to and driven by the rotating shaft 4 of the electric motor 3 are housed.

Carbon dioxide (CO ₂ ) is selected as a natural refrigerant that is friendly to the global environment and has no flammability or toxicity. In addition, as the refrigerating machine oil suitable for the natural refrigerant, for example, existing refrigerating machine oil such as mineral oil (mineral refrigerating machine oil), alkylbenzene oil, ether oil, ester oil, PAG (polyalkylglycol) is sealed in the sealed container 2. Yes.

  The sealed container 2 is a horizontally long cylindrical container sealed at both ends, and a circular mounting hole 2b is formed at the end of the motor 3 side. And the terminal 5 for supplying electric power to the electric motor 3 is attached to the attachment hole 2b.

  The electric motor 3 includes a rotating shaft 4, a stator 6 attached in a ring shape along the inner peripheral surface of the hermetic container 2, and a rotor 7 inserted and installed inside the stator 6 with a slight gap.

  A pump mechanism 15 as an oil supply means is formed at the end of the rotary shaft 4 on the rotary compression mechanism 10 side. The pump mechanism 15 sucks refrigerating machine oil from an oil reservoir 2a formed at the bottom of the sealed container 2, and supplies the refrigerating machine oil to the sliding part of the rotary compression mechanism part 10 to wear the sliding part. It is to prevent. The pump mechanism 15 includes a refrigerator oil suction pipe 16 for sucking refrigerator oil from the bottom of the sealed container 2. The refrigerating machine oil intake pipe 16 descends from the pump mechanism 15 to the oil reservoir 2a, is bent toward the electric motor 3 at the bottom of the hermetic container 2, is extended to the vicinity of a baffle plate 70 described later, and is near the baffle plate 70. An opening 16a is formed in the opening.

  The stator 6 includes a laminated body 6a in which donut-shaped electromagnetic steel plates are laminated, and a stator coil 6b wound around the teeth of the laminated body 6a by a direct winding (concentrated winding) method. Similarly to the stator 6, the rotor 7 is also formed by a laminated body 7a of electromagnetic steel sheets, and is formed by inserting a permanent magnet MG into the laminated body 7a. The rotor 7 is fixed to a rotating shaft 4 extending in the axial direction of the sealed container 2.

  The rotary compression mechanism 10 includes a first stage compression element 20 and a second stage compression element 40 that are driven by the rotating shaft 4 of the electric motor 3. The first-stage compression element 20 and the second-stage compression element 40 are arranged in the sealed container 2 in the order of the first-stage compression element 20 and the second-stage compression element 40 from one side (left side in FIGS. 1 and 2). Has been. The first-stage compression element 20 and the second-stage compression element 40 include an intermediate partition plate 60, cylinders 21 and 41 of first and second-stage compression elements disposed on the left and right of the intermediate partition plate 60, and rotation. Fitted to the eccentric parts 22, 42 of the first and second stage compression elements provided with a phase difference of 180 degrees on the shaft 4, and the eccentric parts 22, 42 of the first stage and second stage compression elements The rollers 23 and 43 that rotate eccentrically in the cylinders 21 and 41 of the first-stage and second-stage compression elements, and the cylinders 21 and 41 in contact with the rollers 23 and 43, respectively, are in the low-pressure chamber side and the high-pressure chamber, respectively. And the supporting members 25 and 45 for closing the opening surface of the cylinder 21 opposite to the electric motor 3 and the opening surface of the cylinder 41 on the electric motor 3 side, respectively. Further, bearings 25a and 45a for the rotating shaft 4 are formed on the support members 25 and 45, respectively.

  On the outside of the vanes 24 and 44 (on the lower side in FIG. 1), springs 26 and 46 that abut the outer ends of the vanes 24 and 44 and constantly bias the vanes 24 and 44 toward the rollers 23 and 43 are provided. It has been. Further, a metal plug (not shown) is provided on the side of the sealed container 2 of the springs 26 and 46, which serves to prevent the springs 26 and 46 from coming off. Further, a back pressure chamber (not shown) is formed in the vanes 24 and 44, and the pressure on the high pressure chamber side in the cylinders 21 and 41 is applied as a back pressure to the back pressure chamber.

  Further, as shown in FIG. 2, the support members 25 and 45 are provided with suction passages 29 and 49 that communicate with the low pressure chamber side inside the cylinders 21 and 41 via the suction ports 28 and 48. The support members 25 and 45 are partially recessed, and the recessed portions are closed by the covers 30 and 50, thereby forming discharge silencing chambers 31 and 51.

  The horizontal two-stage compression rotary compressor 1 includes a compressor chamber 71 in which the rotary compression mechanism unit 10 is stored and a motor chamber in which the motor is stored by a circular flat plate-like baffle plate 70 made of a steel plate in the sealed container 2. 72. A small gap 80 is formed between the outer peripheral end surface of the baffle plate 70 and the inner peripheral surface of the sealed container 2.

  Further, as shown in FIGS. 1 and 3, a plurality of (in this case, three) refrigerant circulation holes 73 through which the refrigerant flows from the motor chamber 72 to the compressor chamber 71 are formed in the upper portion of the baffle plate 70. . In addition, a refrigerating machine oil circulation hole 74 through which refrigerating machine oil flows from the electric motor chamber 72 to the compressor chamber 71 is formed in the lower portion of the baffle plate 70. The refrigerating machine oil circulation hole 74 is provided with a check valve 75 for preventing the refrigerating machine oil from flowing from the compressor chamber 71 side to the motor chamber 72 side. The check valve 75 is a so-called reed valve having a plate shape, which closes the refrigerating machine oil circulation hole 74 at one end and is fixed to the compressor chamber 71 side surface portion of the baffle plate 70 by a screw 76 at the other end. ing. The plate check valve 75 is made of a soft elastic material so as to be opened by a slight pressure difference generated between the electric motor chamber 72 and the compressor chamber 71.

  The discharge silencer chamber 31 of the first stage compression element 20 passes through the cylinders 21, 41, the intermediate partition plate 60, the cover 50, and the baffle plate 70 through the intermediate discharge pipe 34 of the first stage compression element 20 and enters the motor chamber 72. It is communicated to.

  The second-stage compression element 40 is configured to suck the gas refrigerant in the compressor chamber 71 into the cylinder 41 of the second-stage compression element 40 through a suction passage 49 that opens to the compressor chamber 71.

The suction pipe 37 of the first stage compression element 20 is led out of the sealed container 2 through a sleeve 36 attached to the side of the support member 25 on the side surface of the sealed container 2. Further, the discharge pipe 58 of the second-stage compression element 40 is led out of the hermetic container 2 through a sleeve 59 attached to the side of the support member 45 on the side surface of the hermetic container 2.
In addition, the mounting base 2d is provided in the both ends of the longitudinal direction of the bottom part of the airtight container 2 (refer FIG. 1).

Next, the operation of the horizontal two-stage compression rotary compressor 1 configured as described above will be described.
First, when the stator coil 6b of the electric motor 3 is energized through the terminal 5 and a wiring (not shown), the electric motor 3 is activated and the rotor 7 is rotated. By this rotation, the eccentric parts 22 and 42 provided integrally with the rotary shaft 4 rotate, and the rollers 23 and 43 fitted to the eccentric parts 22 and 42 rotate eccentrically in the cylinders 21 and 41.

  As a result, the refrigerant in the refrigerant circuit (not shown) connected to the outside of the horizontal two-stage compression rotary compressor 1 passes through the suction pipe 37, the suction passage 29 and the suction port 28 of the first stage compression element 20. Via, it is sucked into the low pressure chamber side of the cylinder 21 of the first stage compression element 20. The gas refrigerant sucked into the low pressure chamber side of the cylinder 21 is compressed by the operation of the roller 23 and the vane 24 to become an intermediate pressure, and is discharged into the motor chamber 72 in the sealed container 2 through the intermediate discharge pipe 34.

  The intermediate pressure gas refrigerant discharged into the motor chamber 72 contains refrigeration oil. The refrigeration oil contained in the intermediate-pressure gas refrigerant is separated in the electric motor chamber 72 and stored in the oil reservoir 2 a at the bottom in the electric motor chamber 72.

The gas refrigerant discharged into the motor chamber 72 is formed in the upper portion of the gap 80 and the baffle plate 70 formed between the outer peripheral end surface of the baffle plate 70 and the inner surface of the sealed container 2 after the frozen oil is separated. The refrigerant flows into the compressor chamber 71 through the refrigerant circulation hole 73.
The intermediate-pressure gas refrigerant that has flowed into the compressor chamber 71 is sucked into the low-pressure chamber side in the cylinder 41 of the second-stage compression element 40 through the suction passage 49 that opens to the compressor chamber 71. Then, the second stage of compression is performed by the rotation of the roller 43 and the vane 44 to form a high-pressure and high-temperature gas refrigerant, and the external port passes through a discharge port (not shown), a discharge silencer chamber 51 formed in the support member 45, and a discharge pipe 58. It is discharged to a refrigerant circuit (not shown).
Since such a refrigerant flow is formed, the intermediate-pressure discharge gas from the first-stage compression element 20 is not directly sucked into the second-stage compression element 40, and the refrigerating machine oil in the electric motor chamber 82 is not drawn. Separation is performed efficiently.

  As described above, in the sealed container 2, the refrigerant flows through the gap 80 and the refrigerant circulation hole 73, and the sizes of the gap 80 and the refrigerant circulation hole 73 are set to appropriate sizes. Thus, an appropriate differential pressure is generated between the left and right sides of the baffle plate 70, that is, between the motor chamber 72 and the compressor chamber 71. That is, the pressure in the motor chamber 72 is configured to be higher than the pressure in the compressor chamber 71.

  Thus, when a suitable pressure difference is generated between the motor chamber 72 and the compressor chamber 71, the check valve 75 attached to the lower portion of the baffle plate 70 is opened. Therefore, the refrigerating machine oil separated in the motor chamber 72 and stored in the oil reservoir 2a on the motor chamber 72 side is bottom when the oil level 72a in the motor chamber 72 is above the refrigerating machine oil circulation hole 74. Flows into the compressor chamber 71 through the gap 80 and the refrigerator oil circulation hole 74.

  Further, since the pressure in the compressor chamber 71 is lower than that in the electric motor chamber 72 as described above, the horizontal two-stage compression rotary compressor 1 is shown in FIG. As described above, the oil level 71a of the refrigerating machine oil on the compressor chamber 71 side becomes higher than the oil level 72a on the motor chamber 72 side. As a result, the opening 16a of the refrigerating machine oil suction pipe 16 is immersed in the refrigerating machine oil without any trouble, so that the refrigerating machine oil is smoothly supplied to the sliding portion of the rotary compression mechanism 10 by the pump mechanism 15. Done.

  Next, when the horizontal two-stage compression rotary compressor 1 is tilted from the horizontal state toward the rotary compression mechanism section 10 as shown in FIG. 4B, the compressor chamber 71 is positioned at the lower portion, so that the gap portion The refrigerating machine oil in the electric motor chamber 72 further flows into the compressor chamber 71 side through 80 and the refrigerating machine oil circulation hole 74. For this reason, the oil level 71b of the compressor chamber 71 becomes higher than the state of the said FIG. 4 (a). Therefore, in this case, the pumping of the refrigerating machine oil is performed without any trouble. In addition, the code | symbol 72b in FIG.4 (b) shows the oil level of the motor chamber 72 in this inclination state.

Further, when the horizontal two-stage compression rotary compressor 1 is inclined from the horizontal state toward the electric motor 3 as shown in FIG. 4C, the compressor chamber 71 is located above the electric motor chamber 72. 71 refrigeration oil easily flows from the compressor chamber 71 to the motor chamber 72 side. However, since the check valve 75 is provided in the refrigerating machine oil circulation hole 74, the refrigerating machine oil in the compressor chamber 71 does not flow back into the motor chamber 72 at a stretch. Further, if this state is maintained for a certain period of time, the refrigeration oil in the compressor chamber 71 flows to the motor chamber 72 side through the gap 80 at the bottom of the hermetic container 2, so that the oil level 72c of the motor chamber 72 is a baffle plate. The side height rises to the height of the refrigerator oil circulation hole 74.
However, even in this state. As shown in FIG. 4 (c), the oil surface 71c in the vicinity of the baffle plate 70 on the compressor chamber 71 side is located above the refrigerating machine oil circulation hole 74, so that the opening 16a of the refrigerating machine oil suction pipe 16 has an oil level. The pump oil is smoothly pumped up without being in the upper position.

  The horizontal two-stage compression rotary compressor 1 is inclined to either the rotary compression mechanism 10 side or the electric motor 3 side, and a strong vibration is applied to the horizontal two-stage compression rotary compressor 1 from the outside. The oil surfaces 71a, 71b, 71c of the portion where the opening 16a of the refrigerating machine oil suction pipe 16 is located vary greatly in the vertical direction. However, since the oil level of the opening 16a is increased as described above, the risk of the opening 16a jumping above the oil surfaces 71a, 71b, 71c is reduced.

  Thus, according to the horizontal two-stage compression rotary compressor 1 according to the embodiment of the present invention, even if the horizontal two-stage compression rotary compressor is inclined to the rotary compression mechanism portion side or the electric motor side, Furthermore, even if strong vibration is applied from the outside in addition to such an inclination, the refrigeration oil can be pumped up unless it is an extreme inclination or vibration.

  Therefore, the horizontal two-stage compression rotary compressor 1 according to the embodiment of the present invention can sufficiently pump refrigeration oil even when applied to an automotive air conditioner that is severely inclined or vibrated. Further, it is possible to sufficiently supply the refrigerating machine oil to the rotary compression mechanism unit 10 without increasing the amount of the refrigerating machine oil sealed in the sealed container 2.

  In the above embodiment, the refrigerant circulation hole 73 is formed in the baffle plate 70. However, if the gap 80 is sufficiently large, the refrigerant circulation hole 73 can be omitted.

  In the above embodiment, CO2 (carbon dioxide) is used as the refrigerant. However, the present invention is not limited to these refrigerants, and is implemented using HC (hydrocarbon), NH3 (ammonia), or the like. Is also possible.

  In the above embodiment, the horizontal two-stage compression rotary compressor 1 has been described as an example. However, the present invention is not limited to this, and the horizontal multistage compression in which the rotary compression mechanism 10 has three, four, or more stages. It is also possible to apply to a rotary compressor.

  The multistage compression rotary compressor according to the present invention includes a home air conditioner, a commercial air conditioner (package air conditioner), an automotive air conditioner, a heat pump hot water supply device, a home refrigerator, a commercial refrigerator, a commercial freezer, and a commercial freezer. It can also be used for refrigerators and vending machines.

1 is a longitudinal side view of a horizontal two-stage compression rotary compressor according to an embodiment of the present invention. It is a plane sectional view of the same horizontal type two-stage compression type rotary compressor. It is a side view of the baffle board in the same horizontal two-stage compression type rotary compressor. It is an oil level state figure of the oil reservoir part in the horizontal type two-stage compression type rotary compressor, (a) is an oil level state figure when the horizontal type two-stage compression type rotary compressor is in a horizontal state, and (b) is the same figure. Oil level diagram when the horizontal two-stage compression rotary compressor is tilted toward the rotary compression mechanism, (c) is an oil level diagram when the horizontal two-stage compression rotary compressor is tilted toward the motor side It is.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Horizontal 2 step | paragraph compression type rotary compressor 2 Sealed container 2a Oil reservoir 3 Electric motor 10 Rotary compression mechanism part 15 Pump mechanism 16 Refrigerating machine oil suction pipe 16a (Refrigerating machine oil suction pipe) opening 20 1st stage compression element 40 1st Two-stage compression element 70 Baffle plate 71 Compressor chamber 71a Oil surface 71b Oil surface 71c Oil surface 72 Motor chamber 72a Oil surface 72b Oil surface 72c Oil surface 73 Refrigerant flow hole 74 Refrigerating machine oil flow hole 80 Gap

Claims (3)

A hermetic container having an oil reservoir for storing refrigerating machine oil at the bottom, a rotary compression mechanism composed of a first stage compression element and a second stage compression element, and a rotary compression mechanism connected directly to a rotary shaft An electric motor arranged on the side of the rotary compression mechanism section, a pump mechanism provided at the end of the rotary shaft on the rotary compression mechanism section side, and a pump mechanism for pumping refrigeration oil from the oil reservoir The inside of the sealed container is divided into a compressor room containing the rotary compression mechanism and a motor room containing the motor. And a gap formed between the outer peripheral end surface of the baffle plate and the inner peripheral surface of the sealed container,
The first stage compression element is formed to discharge a discharge gas refrigerant into the electric motor chamber, the second stage compression element is formed to suck the gas refrigerant in the compressor chamber, and the refrigerator oil suction pipe is The horizontal multi-stage compression rotary compressor is characterized in that its front end opening is disposed in the vicinity of the baffle plate in the compressor chamber of the oil reservoir. The baffle plate includes a refrigerating machine oil circulation hole for circulating refrigerating machine oil in a lower portion, and a check valve for preventing a reverse flow of the refrigerating machine oil from the compressor chamber to the motor chamber in the refrigerating machine oil circulation hole. The horizontal multistage compression rotary compressor according to claim 1. An automotive air conditioner comprising the horizontal multi-stage compression rotary compressor according to claim 1 or 2 and using a carbon dioxide refrigerant as a refrigerant.

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