JP4446923B2 - compressor - Google Patents

Description

  The present invention relates to a compressor suitable for horizontal installation, and more particularly to a compressor suitable for a vehicle air conditioner or the like.

A multi-stage compression rotary compressor that uses carbon dioxide (CO ₂ ) as a refrigerant and includes a rotary compression mechanism composed of a first rotary compression element and a second rotary compression element is usually electrically driven in the upper part of a vertical sealed container. An element is arranged, and a rotary compression mechanism unit driven by a rotating shaft of the electric element is arranged below. Moreover, the rotating shaft is supported by the upper and lower bearing portions of the rotary compression mechanism portion, and does not have a bearing above the electric element.

And when using such a multistage compression type rotary compressor for a vehicle air conditioner etc., the said compressor may be arrange | positioned as a horizontal type from problems, such as installation space. For example, Patent Document 1 discloses a configuration in which a multistage compression rotary compressor is used in a horizontal type and an oil supply mechanism that uses an oil pump for smoothly lubricating a bearing portion even when the rotary type is used in a horizontal type.
JP 2003-286987 A

  By the way, in such a horizontal type multi-stage compression rotary compressor, since the rotary shaft is also placed horizontally, depending on the use conditions of the compressor, vibrations and noise may occur from the vicinity of the electric element that does not support the rotary shaft by the bearing. . Therefore, even if a bearing portion is provided near the upper part of the electric element to support the rotating shaft, the lubrication method of the bearing portion becomes a problem, and vibration or noise due to insufficient lubrication, or seizure of the bearing may occur. .

  Accordingly, an object of the present invention is to provide a compressor capable of suppressing insufficient lubrication of a bearing portion and reducing vibration and noise even when used as a horizontal type.

  The compressor according to claim 1 is provided in a hermetically sealed container, and includes a first space that houses the electric element, and a rotary compression mechanism that includes a rotary compression element that is driven by the rotary shaft of the electric element and compresses the refrigerant. A second space that is provided in the sealed container and that houses the rotary compression mechanism, a tip bearing that is provided in the first space and supports the rotating shaft, and the inside of the sealed container is A partition member partitioned into a first space and a second space, and a communication that penetrates the partition member and is formed in the rotation shaft, and communicates the first space and the second space. And a first discharge part for discharging the refrigerant compressed by the rotary compression element into the second space, and the refrigerant discharged from the first discharge part from the first space. A second discharge unit for discharging out of the sealed container; The refrigerant discharged from the first discharge part is a refrigerant containing oil, and the refrigerant is supplied to the tip end bearing through the communication part and flows into the first space. It is characterized by doing.

  ADVANTAGE OF THE INVENTION According to this invention, even when using as a horizontal type, the compressor which can lubricate a bearing part smoothly and can suppress a vibration and noise is provided.

Embodiments of a compressor according to the present invention will be described below in detail with reference to the drawings.
<Embodiment 1>
An embodiment of the present invention will be described in detail based on the drawings. FIG. 1 shows a side sectional view of a rotary compressor 10 as an embodiment of the compressor of the present invention. The rotary compressor 10 is an internal intermediate pressure type two-stage compression rotary compressor using carbon dioxide (CO ₂ ) as a refrigerant, and the rotary compressor 10 includes a horizontally long cylindrical sealed container 12 whose both ends are sealed. The bottom of the container 12 is an oil reservoir. The sealed container 12 includes an electric element 14, a first rotary compression element 32 (first stage) and a second rotary compression element 34 (second stage) driven by the rotating shaft 16 of the electric element 14. And a rotary compression mechanism 18, and a leg 110 for fixing the rotary compressor 10 is provided on the outer surface of the bottom.

  The sealed container 12 is composed of a container body 12A that houses the electric element 14 and the rotary compression mechanism 18 and an end cap (lid body) 12B that is substantially above the lid that closes the end of the container body 12A on the electric element 14 side. Composed.

  A circular mounting hole 12D is formed on the outer surface of the container body 12A, and a terminal 20 (wiring is omitted) for supplying electric power to the electric element 14 is mounted in the mounting hole 12D.

  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 at a slight interval. The rotor 24 is fixed to a rotating shaft 16 that passes through the center and extends in the axial direction of the sealed container 12. Here, the stator 22 has a laminated body (not shown) in which donut-shaped electromagnetic steel plates are laminated, and a stator coil 28 wound around the teeth of the laminated body by a direct winding method. The rotor 24 is also formed of a laminated body of electromagnetic steel plates, like the stator 22, and is formed by inserting a permanent magnet into the laminated body.

  A suction passage 101 is formed in the support member 67 at the end of the rotating shaft 16 on the electric element 14 side. The suction passage 101 introduces refrigerant discharged from an intermediate discharge pipe 65 (described later) to the electric element 14 side of the baffle plate 100 into the intermediate refrigerant discharge pipe 92 on the rotary compression mechanism portion 18 side of the baffle plate 100 and is sealed. It is provided to supply oil as lubricating oil sucked up from the oil sump at the bottom in the container 12 to each sliding portion.

  Further, a passage 82 is provided in the rotary shaft 16 so as to penetrate the shaft center in the horizontal direction, and one end of the passage 82 on the rotary compression mechanism portion 18 side is opened at the discharge port 82A. The other end on the element 14 side communicates with the suction passage 101 at the suction port 82B. The passage 82 is provided with a communication hole so that oil can be supplied to the sliding portions of the rotary compression elements 32 and 34 and the tip end bearing 3.

  The outer peripheral surface of the rotary shaft 16 in the vicinity of the suction port 82B is supported by the tip bearing 3 fixed to the center of the tip bearing support member 2.

  The tip end bearing support member 2 is provided with holes and slits in the bottom part and the inner peripheral surface of the container body, so that refrigerant and oil can be circulated.

  The first rotary compression element 32 and the second rotary compression element 34 of the rotary compression mechanism section 18 are constituted by first and second cylinders 38, 40, and an intermediate partition plate 36 is interposed between these cylinders 38, 40. It is pinched.

  The first and second rotary compression elements 32 and 34 are provided on the first and second cylinders 38 and 40 disposed on both sides (left and right in FIG. 1) of the intermediate partition plate 36 and the rotary shaft 16, respectively. First and second rollers 46 and 48 which are fitted to the first and second eccentric portions 42 and 44 having a different phase difference of 180 degrees and rotate eccentrically in the first and second cylinders 38 and 40, respectively. The first and second vanes 50 and 52 that abut against the rollers 46 and 48 and divide the cylinders 38 and 40 into a low-pressure chamber side and a high-pressure chamber side, respectively, and an opening surface of the cylinder 40 on the electric element 14 side. And supporting members 54 and 56 that also serve as bearings for the rotary shaft 16 by closing the opening surface of the cylinder 38 opposite to the electric element 14.

  On the outer side of the vanes 50 and 52 (upper side in FIG. 1), springs 74 and 76 that are in contact with the outer ends of the vanes 50 and 52 and constantly bias the vanes 50 and 52 toward the rollers 46 and 48 are provided. ing. Furthermore, metal plugs 122 and 123 are provided on the sealed container 12 side of the springs 74 and 76, and serve to prevent the springs 74 and 76 from coming off. Further, a back pressure chamber (not shown) is formed in the second vane 52, and the pressure on the high pressure chamber side in the cylinder 40 is applied as a back pressure to the back pressure chamber.

  Discharge silencing chambers 62 and 64 are formed by partially recessing the support members 54 and 56 and closing the recessed portions with baffle plates 100 and a cover 68, which will be described later, respectively. That is, the discharge silencer chamber 62 is formed by closing the recessed portion of the support member 54 with the baffle plate 100, and the discharge silencer chamber 64 is formed by closing the recessed portion of the support member 56 with the cover 68.

  The discharge silencer chamber 64 and the sealed container 12 are communicated with each other by an intermediate discharge pipe 65 that passes through the cylinders 38 and 40, the intermediate partition plate 36, and the baffle plate 100 and opens to the electric element 14 side. The intermediate-pressure refrigerant gas compressed by the first rotary compression element 32 is discharged from the pipe 65 to the electric element 14 side in the sealed container 12. At this time, the oil supplied to the first rotary compression element 32 is mixed in the refrigerant gas, but this oil is also discharged to the electric element 14 side in the sealed container 12. Here, a part of the oil mixed in the refrigerant gas is separated from the refrigerant gas and collected in the oil reservoir at the bottom of the sealed container 12.

  Further, in the sealed container 12, the refrigerant introduction pipe 94 for introducing the refrigerant gas into the first rotary compression element 32 and the refrigerant gas discharged into the sealed container 12 from the intermediate discharge pipe 65 are subjected to the second rotary compression. An intermediate refrigerant discharge pipe 92 and an intermediate refrigerant introduction pipe 93 for introducing into the element 34 and a refrigerant discharge pipe 96 for discharging the refrigerant gas compressed to a high pressure by the second rotary compression element 34 are inserted. It is connected.

  The baffle plate 100 described above is provided to divide the inside of the sealed container 12 into the electric element 14 side and the rotary compression mechanism unit 18 side, and to form a differential pressure in the sealed container 12. The baffle plate 100 is made of a donut-shaped steel plate, and is tightly fixed along the inner peripheral surface of the container body 12A.

  In this way, by installing the baffle plate 100 in close contact with the inner peripheral surface of the container main body 12A, the internal space of the sealed container 12 is placed on the electric element 14 side and the rotary compression mechanism unit 18 side via the baffle plate 100. These two sections communicate with each other only by the suction passage 101 and the passage 82 as communication portions as described above. Thereby, a desired differential pressure | voltage can be comprised between the electric element 14 side in the airtight container 12, and the rotation compression mechanism part 18 side.

  Here, the intermediate-pressure refrigerant gas compressed by the first rotary compression element 32 and discharged to the electric element 14 side in the hermetic container 12 passes through the suction passage 101 and the passage 82 as described above, and the rotary compression mechanism. However, due to the presence of the baffle plate 100, the pressure in the electric element 14 side of the baffle plate 100 is high and the differential pressure in the rotary compression mechanism portion 18 side is low in the sealed container 12. The Due to this differential pressure, in the rotary compressor 10 of the present embodiment, the refrigerant gas discharged from the intermediate discharge pipe 65 into the sealed container 12 and the oil separated from the refrigerant gas can be easily moved to the rotary compression mechanism 18 side. The oil can be supplied into the passage 82 without providing an oil pump or the like, so that the oil can be smoothly supplied to each sliding portion.

  Further, since the baffle plate 100 also serves as a cover for the discharge silencer chamber 62 formed by recessing a part of the support member 54 as described above, the structure is simplified by reducing the number of parts, the cost is reduced, and the dimensions are reduced. Can be miniaturized.

  As the refrigerant, the carbon dioxide (CO2), which is a natural refrigerant, is used in consideration of flammability and toxicity. As the oil as the lubricating oil enclosed in the sealed container 12, for example, mineral oil (mineral oil) ), Alkylbenzene oil, ether oil, PAG (polyalkylene glycol), POE (polyol ester) and the like.

  Next, the operation of the rotary compressor 10 in the present embodiment 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 upper and lower rollers 46 and 48 fitted to the upper and lower eccentric parts 42 and 44 provided integrally with the rotary shaft 16 eccentrically rotate in the upper and lower cylinders 38 and 40.

  As a result, low-pressure refrigerant gas is sucked into the low-pressure chamber side of the cylinder 38 of the first rotary compression element 32 via a suction passage (not shown) formed in the refrigerant introduction pipe 94 and the support member 56, The refrigerant gas is compressed by the operation of the vane 50 to an intermediate pressure, and is discharged from the high-pressure chamber side of the cylinder 38 to the electric element 14 side in the hermetic container 12 through the intermediate discharge pipe 65. At this time, the oil supplied from the oil passage 82 to the first rotary compression element 32 is mixed in the intermediate-pressure refrigerant gas discharged to the electric element 14 side in the sealed container 12, and this oil A part is separated and stored in an oil sump at the bottom of the sealed container 12.

  Further, as described above, the inside of the sealed container 12 is partitioned by the baffle plate 100 into the electric element 14 side and the rotary compression mechanism portion 18 side, and these sections are communicated only by the suction passage 101 and the passage 82. Yes. For this reason, the refrigerant gas discharged from the intermediate discharge pipe 65 cools the electric element 14, passes through the suction passage 101 from one end 101 </ b> A of the suction passage 101, passes from the suction port 82 </ b> B through the other end 101 </ b> B. It passes through 82 and reaches the rotary compression mechanism 18 side by the discharge port 82A.

  Since the electric element 14 side and the rotary compression mechanism 18 side are communicated with each other through the suction passage 101 and the passage 82 as described above, the pressure in the sealed container 12 is higher than that of the electric compression element portion 18 from the electric element 14 side. The oil thus separated is easily supplied into the passage 82 from one end 101A on the oil reservoir side of the suction passage 101 by this differential pressure.

  Thereby, in the rotary compressor 10 of this Embodiment, it becomes possible to supply oil to each sliding part without using an oil pump or the like. That is, the oil that has reached the passage 82 via the suction passage 101 is supplied to the tip bearing 3, the first rotary compression element 32, and the second rotary compression portion 34 to lubricate the sliding portions, The rest is discharged from the discharge port 82A and introduced into the second rotary compression element 34 at the subsequent stage.

  On the other hand, the refrigerant gas discharged from the intermediate discharge pipe 65 cools the electric element 14 as described above, passes through the passage 82 together with oil, and once passes through the outside of the sealed container 12 from the intermediate refrigerant discharge pipe 92. Then, it is introduced into the low pressure chamber side of the second rotary compression element 34 through the intermediate refrigerant introduction pipe 93. The refrigerant gas is compressed at the second stage by the action of the roller 48 and the vane 52 of the second rotary compression element 34 to become a high-temperature and high-pressure refrigerant gas, and is formed on the support member 54 from the high-pressure chamber side. Then, after passing through the discharge silencer chamber 62 and the refrigerant discharge pipe 96 via an external radiator or the like (not shown), the refrigerant is led again from the refrigerant introduction pipe 94 to the first rotary compression element 32.

  From the above, the rotary compressor 10 according to the present embodiment reliably uses the flow of the refrigerant gas flowing into the low pressure chamber side of the second rotary compression element 34 even when the rotary compression mechanism portion 18 side is inclined low, for example. The oil can be supplied to the rotary compression mechanism 18 side.

Further, the intermediate-pressure refrigerant gas compressed by the first rotary compression element 32 that is the first stage reaches the passage 82 through the suction passage 101 together with the oil. This can be performed without using a pump or the like. In particular, the tip bearing 3 that is difficult to lubricate can be easily lubricated.
<Embodiment 2>
Next, another embodiment of the present invention will be described with reference to FIG. FIG. 2 is a side sectional view of the rotary compressor 30 in this case, and components having the same reference numerals as those in FIG. 1 have the same or similar functions and effects. The rotary compressor 30 of the present embodiment is different from the rotary compressor 10 of the first embodiment in the arrangement of the support member 67, the suction passage 101, the intermediate discharge pipe 65, and the intermediate refrigerant discharge pipe 92. .

  That is, in the rotary compressor 30 of the present embodiment, the support member 67 and the suction passage 101 are provided on the rotary compression mechanism 18 side partitioned by the baffle plate, and the intermediate discharge pipe 101 is on the rotary compression mechanism 18 side. The intermediate refrigerant discharge pipe 92 is provided on the electric element 14 side.

  The rotary compressor 30 is configured as described above, and the intermediate pressure refrigerant compressed by the first rotary compression element 32 is rotated by the intermediate discharge pipe 65 and the rotary compression mechanism 18 in which the sealed container 12 is partitioned by the baffle plate 100. After being discharged to the side, the second rotary compression element 34 is reached via the suction passage 101 and the passage 82 and the intermediate refrigerant discharge pipe 92 and the intermediate refrigerant introduction pipe 93.

  As a result, also in the present embodiment, the electric element 14 side and the rotary compression mechanism portion 18 side are communicated only by the passage 82 and the like with the baffle plate 100 interposed therebetween. Easy to be supplied.

  In the above embodiments, the present invention has been described using a multistage compression rotary compressor. However, the present invention is not limited to this, and the present invention can also be used in a compressor such as a reciprocating compressor.

  In each of the above embodiments, the inner surface of the sealed container 12 and the outer edge of the baffle plate 100 are brought into close contact with each other, and the electric element 14 side and the rotary compression mechanism unit 18 side of the baffle plate 100 are connected to the suction passage 101 and In this configuration, the oil passage and the refrigerant gas passage are completely shared, so that it may be difficult to suck oil at one end 101A of the suction passage 101 or the like. .

  Therefore, when the above-described problem occurs, the gap as the refrigerant gas passage is not close to the upper part of the baffle plate 100 or more than the center line without completely contacting the inner surface of the sealed container 12 and the outer edge of the baffle plate 100. It may be formed at this position. Note that the gap needs to be within a range in which a difference in the oil head on both sides of the baffle plate 100 can be secured, for example, 1 mm or less.

  In each of the above embodiments, the baffle plate 100 also serves as the cover of the discharge silencer chamber 62. Regardless of this, the baffle plate 100 and the cover of the discharge silencer chamber 62 are different. However, the present invention is effective.

  Furthermore, in each of the above embodiments, it is not necessary to provide an oil pump. However, an oil pump or the like may be disposed in the vicinity of the support member 67 depending on the use conditions of the compressor of the present invention.

  In each of the above embodiments, carbon dioxide (CO2) is used as a refrigerant. However, the present invention is effective even when a refrigerant such as hydrocarbon (HC) or ammonia (NH3) is used.

It is a side sectional side view of the rotary compressor which is one Embodiment of the compressor of this invention. It is a side sectional side view of the rotary compressor which is other embodiment of the compressor of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 2 Tip part bearing support member 3 Tip part bearing 10, 30 Rotary compressor 12 Sealed container 12A Container main body 12B End cap 12D Mounting hole 14 Electric element 16 Rotating shaft 18 Rotation compression mechanism part 20 Terminal 22 Stator 24 Rotor 28 Stator coil 32 1st Rotational compression element 34 Second rotational compression element 36 Intermediate partition plate 38, 40 Cylinder 42, 44 Eccentric part 46, 48 Roller 50, 52 Vane 54, 56 Support member 62, 64 Discharge silencer chamber 65 Intermediate discharge pipe 66 Baffle Plate 67 Support member 68 Cover 74, 76 Spring 82 Passage 82A Discharge port 82B Suction port 92 Intermediate refrigerant discharge tube 93 Intermediate refrigerant introduction tube 94 Refrigerant introduction tube 96 Refrigerant discharge tube 100 Baffle plate 101 Suction passage 110 Legs 122, 123 Plug

Claims (1)

A first space that is provided in the sealed container and that houses the electric element; a rotary compression mechanism that includes a rotary compression element that is driven by a rotating shaft of the electric element to compress the refrigerant; and is provided in the sealed container. A second space for housing the rotary compression mechanism, a tip bearing provided in the first space and supporting the rotating shaft, and the first space and the second space in the sealed container A partition member that divides the first space and the second space, and a communication member that penetrates the partition member and communicates with the first space and the second space, and is compressed by the rotary compression element. A first discharge section for discharging the refrigerant into the second space, and a first discharge section for discharging the refrigerant discharged from the first discharge section from the first space to the outside of the sealed container. 2 discharge portions, and discharged from the first discharge portion. The refrigerant is a refrigerant containing oil, the refrigerant is supplied to the tip bearing through the communicating portion, characterized in that it flows into the first space compressor.

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