JP2005147071A - Horizontal type multi-stage compression rotary compressor, and air conditioner having the same 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, in the horizontal type multi-stage compression rotary compressor of a so-called internal intermediate pressure type. <P>SOLUTION: A sealed vessel 2 houses a rotary compression mechanism part 10 constituted of a first-stage compression element 20 and a second-stage compression element 40 and an electric motor 3 driving the rotary compression mechanism part 10, and has a bottom part used as an oil reservoir part 2a. The sealed vessel 2 has a baffle plate 70 therein dividing the sealed vessel 2 into two sections of a compressor chamber 81 housing the rotary compression mechanism part 10 and an electric motor chamber 82 housing the electric motor 3. The baffle plate 70 is in a shape of a cup constituted of a disc partition part 71 and a wall part 72 extending from the partition part 71 to an electric motor 3 side, and a clearance part 73 is formed between the wall part 72 and an inner face of the sealed vessel 2. Gas discharged from the first-stage compression element 20 is exhausted to the electric motor chamber 82, and gaseous cooling medium of the intermediate pressure flowing from the electric motor chamber 82 to the compressor chamber 81 is taken into the second-stage compression element 40. <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 multistage compression rotary compressor using carbon dioxide (CO ₂ ) as a refrigerant, a two-stage compression rotary compressor provided with a rotary compression mechanism section composed of a first-stage compression element and a second-stage compression element, particularly an internal An intermediate pressure type two-stage compression 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 is drawn from the refrigerant circuit through 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 compressor. It discharges in the airtight container through the discharge port of 1 rotation compression element, a discharge silencer chamber, etc.

  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 tends to flow 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.

  The present invention has been made in order to solve such a technical problem. In the application in which the so-called internal intermediate pressure type multi-stage compression rotary compressor is a horizontal type, the compressor is operated in an inclined state. Another object of the present invention is to smoothly supply the refrigerating machine oil to the sliding portion.

  The horizontal multi-stage compression rotary compressor according to the present invention achieves the above-described object, and includes a sealed container having an oil reservoir portion for storing refrigerating machine oil at the bottom, a first-stage compression element, and a second-stage compression. Rotation compression mechanism section composed of elements, an electric motor arranged on the side of the rotation compression mechanism section so as to drive the rotation compression mechanism section directly connected to the rotation shaft, and provided at the end of the rotation shaft on the rotation compression mechanism section side A pump mechanism, a refrigerating machine oil suction pipe connected to the pump mechanism for pumping the refrigerating machine oil from the oil reservoir, and a compression housing the rotary compression mechanism section, which is disposed between the rotary compression mechanism section and the electric motor. A baffle plate that divides the inside of the hermetic container into a motor chamber and a motor chamber housing the motor, wherein the first stage compression element is formed to discharge a discharge gas refrigerant into the motor chamber, and the second stage The compression element uses the gas refrigerant in the compressor chamber Further, the baffle plate is formed between the disk-shaped partition that divides the sealed container, and a slight gap between the partition and the inner surface of the sealed container. It is formed from the wall part arrange | positioned and formed.

  An automobile air conditioner according to the present invention includes the horizontal multi-stage compression rotary compressor, and uses carbon dioxide refrigerant as a refrigerant.

The horizontal multistage compression rotary compressor according to the present invention houses a compressor chamber containing a rotary compression mechanism and an electric motor inside a sealed container by providing a baffle plate between the rotary compression mechanism and the electric motor. It is divided into the motor chamber, and the discharge gas refrigerant of the first stage compression element is discharged into the motor chamber, and the gas refrigerant flowing from the motor chamber into the compressor chamber is sucked into the second stage compression element. Therefore, the intermediate-pressure gas refrigerant discharged from the first stage compression element into the motor chamber is not directly sucked into the second stage compression element, and the refrigeration oil in the gas refrigerant is easily separated. Further, the pressure in the motor chamber becomes higher than the pressure in the compressor chamber, and the oil level in the compressor chamber can be raised. In addition, when the compressor is tilted toward the motor side, at least in the motor room, refrigeration oil accumulates until the oil level touches the gap, but this amount is compared to the case where the baffle plate is formed as a flat plate with only a partition. It is reduced by the partition part and the wall part of the baffle plate.
That is, the baffle plate is composed of a partition part and a wall part, and the wall part is extended to the motor side so that the tip of the gap formed between the wall part and the inner surface of the sealed container is closer to the motor side. be able to. As a result, the amount of refrigerating machine oil until the oil level touches the gap can be greatly reduced as compared to the case where the oil is formed in a flat plate shape. Therefore, the horizontal type multi-stage compression rotary compressor of the present invention can suppress the refrigerating machine oil accumulated on the motor chamber side when the compressor is inclined, and increase the refrigerating machine oil accumulated on the compressor chamber side accordingly. be able to. Moreover, the refrigerating machine oil to be filled can be reduced by increasing the refrigerating machine oil accumulated on the compressor chamber side in this way.

  In addition, since the automotive air conditioner according to the present invention uses the horizontal multi-stage compression rotary compressor that can be operated in an inclined state as described above, it can be applied to an automotive air conditioner that is severely inclined and vibrated. In addition, since carbon dioxide refrigerant is used as the refrigerant, it is possible to provide an automotive air conditioner that is excellent in global environmental conservation.

  Next, embodiments of the present invention 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, and FIG. 2 is a plan sectional view of the horizontal two-stage compression 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 rotary shaft 4 of the electric motor 3 are housed.

  Carbon dioxide is selected as a natural refrigerant that is environmentally friendly 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 that is annularly attached along the inner peripheral surface of the hermetic container 2, and a rotor 7 that is inserted inside the stator 6 with a slight gap therebetween. ing.

  A pump mechanism 15 as an oil supply means is formed at the end of the rotary shaft 4 on the rotary compression mechanism section 10 side. The pump mechanism 15 sucks refrigeration oil from an oil reservoir 2a formed at the bottom in the sealed container 2, and supplies the refrigeration oil to the sliding portion of the rotary compression mechanism portion 10 to prevent the sliding portion from being worn. To do. 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 suction pipe 16 has an opening 16a at a position vertically lowered from the pump mechanism 15 to the oil reservoir 2a.

  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 unit 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. Furthermore, metal plugs 27 and 47 that serve to prevent the springs 26 and 46 from coming off are provided on the sealed container 2 side of the springs 26 and 46. 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.

  As shown in FIG. 2, the support members 25, 45 are provided with suction passages 29, 49 communicating with the low pressure chamber side inside the cylinders 21, 41 via the suction ports 28, 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.

  Further, the sealed container 2 of the horizontal two-stage compression rotary compressor 1 is divided into a compressor chamber 81 containing the rotary compression mechanism 10 and an electric motor chamber 82 containing the motor 3 by a baffle plate 70 made of steel plate. Has been.

  The baffle plate 70 is formed in a cup shape including a disk-shaped partition 71 that divides the sealed container 2 into two and a wall 72 that extends from the partition 71 toward the electric motor 3. The baffle plate 70 is fixed by tack welding between the wall 72 and the sealed container 2, and a slight gap 73 is formed between the wall 72 and the inner surface of the sealed container 2. The tip of the wall 72 is extended as close as possible to the stator 6 of the electric motor 3.

  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 is in the motor chamber 82. It is communicated to.

  The second-stage compression element 40 is configured to suck the gas refrigerant in the compressor chamber 81 into the cylinder 41 of the second-stage compression element 40 through a suction passage 49 that opens to the compressor chamber 81.

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 82 in the sealed container 2 through the intermediate discharge pipe 34.

  The intermediate pressure gas refrigerant discharged into the motor chamber 82 contains refrigeration oil. The refrigerating machine oil contained in the intermediate-pressure gas refrigerant is separated in the motor chamber 82 and stored in the oil reservoir 2 a at the bottom of the motor chamber 82.

The gas refrigerant discharged into the motor chamber 82 is separated from the compressor chamber 81 from the gap 73 formed between the wall 72 of the baffle plate 70 and the inner surface of the sealed container 2 after the refrigeration oil is separated. Flow into.
Further, the intermediate-pressure gas refrigerant that has flowed into the compressor chamber 81 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 81. 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).
Further, 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 refrigeration in the electric motor chamber 82 is performed. The machine oil is separated efficiently.

  As described above, in the sealed container 2, the refrigerant flows through the gap 73. By setting the size of the gap 73 to an appropriate size, the left and right sides of the baffle plate 70, that is, the electric motor. An appropriate differential pressure can be generated between the chamber 82 and the compressor chamber 81. In this way, the pressure in the motor chamber 82 is configured to be higher than the pressure in the compressor chamber 81.

  Further, when an appropriate pressure difference is generated between the electric motor chamber 82 and the compressor chamber 81, the refrigerating machine oil separated in the electric motor chamber 82 and stored in the oil reservoir 2a on the electric motor chamber 82 side is Flows into the compressor chamber 81 through the gap 73.

  Therefore, in the state where the horizontal two-stage compression rotary compressor 1 is held horizontally, the oil level 81a of the refrigerating machine oil on the compressor chamber 81 side is on the motor chamber 82 side, as shown in FIG. It becomes higher than the oil level 82a. 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. Is called.

  Next, when the horizontal two-stage compression rotary compressor 1 is inclined from the horizontal state toward the rotary compression mechanism unit 10 as shown in FIG. 3B, the compressor chamber 81 is positioned at the lower portion, so that the gap portion The refrigerating machine oil in the motor chamber 82 further flows into the compressor chamber 81 side through 73. For this reason, the amount of refrigeration oil in the motor chamber 82 decreases, and the oil level 81b of the compressor chamber 81 becomes higher than the state shown in FIG. Therefore, the refrigerating machine oil is smoothly pumped in this case. In addition, the code | symbol 82b in FIG.3 (b) shows the oil level of the motor chamber 82 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. 3C, the compressor chamber 81 is located above the electric motor chamber 82. The refrigerating machine oil in the chamber 82 flows to the motor chamber 82 side through the gap 73 at the bottom of the sealed container 2, and the oil level 82 c of the motor chamber 82 rises at least at the height of the gap 73. However, in this embodiment, since the tip end portion of the gap portion 73 is formed so as to approach the vicinity of the stator 6 of the electric motor 3, the baffle plate 70 is stored on the electric motor chamber 82 side as compared with the case where the baffle plate 70 is formed in a flat plate shape. The amount of refrigerating machine oil to be used can be reduced.

  That is, when the baffle plate 70 is formed in a circular flat plate shape, as shown in FIG. 3C, the oil level on the motor chamber 82 side is increased to 172c and the amount of refrigerating machine oil accumulated on the motor chamber 82 side is increased. . For this reason, the oil level on the compressor chamber 81 side is as low as 171c, and the amount of oil accumulated on the compressor chamber 81 side is reduced. On the other hand, when the baffle plate 70 is formed in a cup shape as in the present embodiment, the oil level on the motor chamber 82 side is lowered to 72c, the amount of oil is reduced, and the oil level on the compressor chamber 81 side is 71c. The amount of oil on the compressor chamber 81 side can be increased. As a result, the opening 16a of the refrigerating machine oil suction pipe 16 can be maintained below the oil surface 81c, and the refrigerating machine oil can be pumped up smoothly.

  In addition, the horizontal type two-stage compression rotary compressor 1 is inclined to either the rotary compression mechanism 10 side or the electric motor 3 side depending on applications, and the horizontal type two-stage compression rotary compressor 1 is subjected to strong vibration from the outside. In addition, the oil surfaces 81a, 81b, 81c on the compressor chamber 81 side may fluctuate greatly in the vertical direction. However, as described above, since the oil surfaces 81a, 81b, 81c on the compressor chamber 81 side are configured to be higher, the opening 16a of the refrigerator oil suction pipe 16 jumps out above the oil surfaces 81a, 81b, 81c. The risk is reduced.

  Thus, according to the horizontal two-stage compression rotary compressor 1 according to the present embodiment, even if the horizontal two-stage compression rotary compressor 1 is inclined to the rotary compression mechanism portion 10 side or the electric motor 3 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 present embodiment can sufficiently pump refrigeration oil even when applied to an automotive air conditioner that is severely inclined or vibrated. In addition, 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, carbon dioxide is used as the refrigerant. However, the present invention is not limited to these refrigerants, and can be carried out using HC (hydrocarbon), NH3 (ammonia), or the like. is there.

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

  Moreover, in the said Example, although the baffle board 70 is formed in the cup shape provided with the disk-shaped partition part 71 and the wall part 72 extended from the partition part 71 to the electric motor 3 side, it is a wall part. About 72, it does not need to be formed along the perimeter of the inner wall of the airtight container 2, and it is sufficient if it is high enough to be immersed in refrigerating machine oil. Therefore, it is not always necessary to form the cup shape. In addition, when the baffle plate 70 is formed in a cup shape as described above, the positioning of the angle in the inner peripheral direction of the sealed container 2 can be made unnecessary when the baffle plate 70 is mounted in the sealed container 2. Easy to manufacture. Further, when the baffle plate 70 is cup-shaped, the object of the present invention can be achieved even if the partition 71 rotates for some reason.

  The horizontal multi-stage compression rotary compressor according to the present invention described above includes a home air conditioner, a commercial air conditioner (package air conditioner), an automotive air conditioner, a heat pump hot water supply device, a household refrigerator, a commercial refrigerator, a commercial freezer, a commercial service. It can also be used for refrigerator-freezers 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 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. is there.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Horizontal type 2 stage compression type rotary compressor 2 Sealed container 2a Oil reservoir part 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 2nd Stage compression element 70 Baffle plate 71 Partition part 72 Cylindrical part 73 Gap part 81 Compressor chamber 81a-81c Oil level 82 Electric motor chamber 82a-82c Oil level

Claims (2)

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 that is directly connected to a rotary shaft and driven. An electric motor disposed on the side of the rotary compression mechanism, a pump mechanism provided at the rotary compression mechanism side end of the rotary shaft, and a refrigeration unit connected to the pump mechanism for pumping refrigeration oil from the oil reservoir. A machine oil suction pipe, and a baffle plate that is disposed between the rotary compression mechanism and the electric motor and divides the inside of the sealed container into a compressor chamber containing the rotary compression mechanism and an electric motor chamber containing the electric motor. 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 baffle plate Is a disk-shaped dividing the sealed container A horizontal multi-stage characterized in that it is formed of a cut portion and a wall portion that extends from the partition portion toward the electric motor and is disposed with a slight gap between the inner surface of the sealed container. Compression type rotary compressor. 2. A vehicle air conditioner equipped with a horizontal multistage compression rotary compressor according to claim 1, wherein carbon dioxide refrigerant is used as the refrigerant.

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