WO2022145048A1 - 圧縮機およびそれを備えた冷凍サイクル装置 - Google Patents
圧縮機およびそれを備えた冷凍サイクル装置 Download PDFInfo
- Publication number
- WO2022145048A1 WO2022145048A1 PCT/JP2021/000007 JP2021000007W WO2022145048A1 WO 2022145048 A1 WO2022145048 A1 WO 2022145048A1 JP 2021000007 W JP2021000007 W JP 2021000007W WO 2022145048 A1 WO2022145048 A1 WO 2022145048A1
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- WIPO (PCT)
- Prior art keywords
- oil
- refrigerant
- compressor
- container
- pipe
- Prior art date
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- 238000005057 refrigeration Methods 0.000 title description 4
- 239000003507 refrigerant Substances 0.000 claims abstract description 119
- 230000006835 compression Effects 0.000 claims abstract description 51
- 238000007906 compression Methods 0.000 claims abstract description 51
- 238000007664 blowing Methods 0.000 claims description 3
- 238000000926 separation method Methods 0.000 abstract description 28
- 238000006243 chemical reaction Methods 0.000 description 10
- 230000007423 decrease Effects 0.000 description 7
- 238000007599 discharging Methods 0.000 description 7
- 230000005484 gravity Effects 0.000 description 7
- 238000001816 cooling Methods 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 4
- 230000002093 peripheral effect Effects 0.000 description 4
- 238000010792 warming Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005187 foaming Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000005192 partition Methods 0.000 description 2
- 238000013019 agitation Methods 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
- F04C18/02—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents
- F04C18/0207—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents both members having co-operating elements in spiral form
- F04C18/0215—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents both members having co-operating elements in spiral form where only one member is moving
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C23/00—Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids
- F04C23/008—Hermetic pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
- F04C29/02—Lubrication; Lubricant separation
- F04C29/026—Lubricant separation
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
- F04C29/02—Lubrication; Lubricant separation
- F04C29/023—Lubricant distribution through a hollow driving shaft
Definitions
- the present disclosure relates to a compressor having a frame outer wallless structure and a refrigerating cycle device equipped with the compressor.
- the oil that lubricates the sliding part of the compressor may be discharged from the discharge pipe to the outside of the compressor together with the compressed refrigerant. If the oil continues to be discharged from the compressor in this way, the oil stored in the oil storage section continues to decrease, and the oil supplied to the sliding section may be depleted and lubrication may be insufficient. Therefore, a compressor has been proposed in which the refrigerant compressed in the compression chamber and the oil are separated and the separated oil is returned to the oil storage section to suppress the decrease in the oil in the oil storage section (see, for example, Patent Document 1). ..
- Patent Document 1 the refrigerant compressed by the compression mechanism unit is swirled by the centrifugal separation unit, oil is separated from the refrigerant by the centrifugal force of the swirling flow, and the separated oil is stored from the return flow path formed by the gap of the frame. Is back to.
- the frame supporting the fixed scroll is fixed to the inner wall of the cylindrical container.
- the frame has a cylindrical outer wall extending in the axial direction of the container and located on the outer peripheral side of the spiral teeth of the fixed scroll, and is fixed to the inner wall of the container by shrink fitting or the like on the outer peripheral surface of the outer wall.
- the fixed scroll is fixed to the outer wall of the frame by fixing the contact portion between the axial end surface of the outer wall of the frame and the base plate of the fixed scroll with screws.
- the outer wall of the frame is located on the outer peripheral side of the spiral teeth of the fixed scroll, so that the refrigerant suction space is narrowed. Therefore, in recent years, in order to expand the refrigerant suction space and expand the capacity, a scroll compressor having a frame outer wallless structure without the outer wall of the frame has been proposed.
- the present disclosure has been made to solve the above problems, and even if the frame has an outer wallless structure, a compressor capable of returning the separated oil to the oil storage section and a freezer equipped with the compressor are provided. It is intended to provide a cycle device.
- the compressor according to the present disclosure includes a container having an oil storage unit, a suction pipe that sucks refrigerant from the outside of the container, and a compression mechanism unit that is arranged inside the container and compresses the refrigerant sucked by the suction pipe.
- a frame for fixing the compression mechanism to the container, a centrifugal separation section for separating oil from the refrigerant compressed by the compression mechanism, and a refrigerant passing through the centrifugal separation section are discharged from the upper part of the container to the outside.
- a compressor having a frame outer wallless structure provided with a discharge pipe for collecting oil and an oil collecting unit provided outside the centrifugal separation unit to collect oil discharged from the centrifugal separation unit, wherein the oil collection unit is provided.
- the section is provided with an oil return pipe for returning the collected oil to the oil storage section, and the centrifugal separation section is provided in a cylindrical portion having a plurality of holes on the side surface and inside the lower region of the cylindrical portion, and the compression mechanism is provided. It has a swirling mechanism portion that forms a swirling flow that flows toward the discharge pipe at the upper part of the container while swirling inside the cylindrical portion by blowing out the oil compressed by the portion.
- the oil is separated from the refrigerant by centrifugal force, the separated oil is discharged to the oil collecting section through the hole, and then discharged to the oil storage section through the oil return pipe.
- the refrigerating cycle device includes the above-mentioned compressor, condenser, drawing device, and a refrigerant circuit in which the evaporator is connected by piping and the refrigerant circulates.
- the oil collecting section is provided with an oil return pipe for returning the collected oil to the oil storage section
- the centrifugal separation section is provided with a swirling centrifugal force from the refrigerant.
- the oil is separated, the separated oil is discharged to the oil collecting section through the holes, and then the oil is discharged to the oil storage section through the oil return pipe. Therefore, even if the frame has an outer wallless structure, the separated oil can be returned to the oil storage unit.
- FIG. It is a schematic sectional drawing which shows the structure of the compressor which concerns on Embodiment 1.
- FIG. It is a perspective view of the swivel mechanism part in the centrifuge part of the compressor which concerns on Embodiment 1.
- FIG. It is a perspective view of the cylindrical part in the centrifuge part of the compressor which concerns on Embodiment 1.
- FIG. It is sectional drawing of the oil return pipe of the compressor which concerns on Embodiment 1, and the periphery thereof. It is a figure which shows the periphery of the spiral lap of the swing scroll and the fixed scroll of the compressor which concerns on Embodiment 1.
- FIG. It is a schematic sectional drawing which shows the structure of the compressor which concerns on Embodiment 2.
- FIG. It is a figure which shows the structural example of the refrigerating cycle apparatus which concerns on Embodiment 3.
- FIG. 1 is a schematic cross-sectional view showing the configuration of the compressor 101 according to the first embodiment.
- the double-lined arrow in FIG. 1 indicates the direction of gravity, and the dotted-lined arrow indicates the main flow of oil.
- the compressor 101 according to the first embodiment is one of the components of a refrigerating cycle device used for applications such as an air conditioner, a refrigerating device, a refrigerator, a freezer, a vending machine, and a hot water supply device. .. Further, the compressor 101 according to the first embodiment is a scroll compressor.
- the compressor 101 according to the first embodiment has a compression mechanism unit 30 for compressing a refrigerant, an electric mechanism unit 40 for driving the compression mechanism unit 30, and a rotational driving force of the electric mechanism unit 40. It includes a rotating shaft 5 that receives and transmits it to the compression mechanism unit 30, and a container 1 that houses the compression mechanism unit 30 and the electric mechanism unit 40. Further, in the container 1, a frame 4 for fixing the compression mechanism portion 30 to the container 1 is provided between the compression mechanism portion 30 and the electric mechanism portion 40.
- an HFC-based refrigerant As the refrigerant compressed by the compressor 101, an HFC-based refrigerant, an HC-based refrigerant, or a natural-based refrigerant is used. Since these refrigerants have a low global warming potential (GWP), their impact on global warming can be reduced.
- GWP global warming potential
- the compression mechanism unit 30 has a power conversion mechanism unit 6, a rocking scroll 7 that is attached to the power conversion mechanism unit 6 and swings, and a fixed scroll 8.
- the power conversion mechanism unit 6 is a mechanism that is attached to a rotation shaft 5 that is rotationally driven by the electric mechanism unit 40 and converts the rotational driving force into a compression driving force.
- a spiral wrap 7a is formed on one surface of the swing scroll 7, and a spiral wrap 8a is formed on one surface of the fixed scroll 8.
- the swing scroll 7 and the fixed scroll 8 are combined so that the spiral laps 7a and 8a mesh with each other.
- a plurality of compression chambers 9 separated from each other by the spiral lap 7a or the spiral lap 8a are formed between the swing scroll 7 and the fixed scroll 8.
- the compressor 101 has a frame outer wallless structure, and by fixing the fixed scroll 8 to the inner wall surface of the side container 1b, the frame outer wallless structure can be realized.
- the frame In compressors that do not have a frame outer wallless structure, the frame generally has an outer wall on which the fixed scroll is placed along the outer edge on one end side, because the fixed scroll is screwed to the frame. be.
- the frame comprises an outer wall
- the oscillating scroll is placed in the space within the outer wall and the size of the oscillating scroll is constrained to the outer wall of the frame. Therefore, in the conventional scroll compressor, the spiral capacity is restricted due to the restriction on the size of the swing scroll, so that the upper limit capacity of the compressor cannot be expanded.
- the frame 4 does not have an outer wall for screwing with the fixed scroll 8. Therefore, in the compressor 101, a space is formed between the side surface of the base plate (not shown) of the rocking scroll 7 and the inner wall surface of the side container 1b.
- the outer diameter of the base plate and the winding diameter of the spiral wrap 7a can be made larger than before. can. That is, the compressor 101 can expand the upper limit capacity of the compressor 101 by increasing the diameters of the spiral wraps 7a and 8a while keeping the container 1 as the conventional design.
- One end of the rotating shaft 5 is rotatably supported by the frame 4 and the power conversion mechanism unit 6, and the other end is rotatably supported by the subframe 10.
- the subframe 10 is fixed to the container 1.
- the detailed connection structure and position of the rotating shaft 5, the frame 4, and the power conversion mechanism unit 6 are not shown. Further, in FIG. 1, the detailed connection structure and position of the rotating shaft 5 and the subframe 10 are not shown.
- the rotor 11 of the electric mechanism portion 40 is attached to the portion between one end and the other end of the rotating shaft 5. Then, the stator 12 of the electric mechanism portion 40 is arranged so as to cover the outer periphery of the rotor 11, and the stator 12 is fixed to the container 1.
- the container 1 is configured by combining three parts, a bottomed tubular upper container 1a, a cylindrical side container 1b, and a bottomed tubular lower container 1c.
- a suction pipe 2 for sucking low-pressure refrigerant from the outside of the compressor 101 is attached to the side container 1b, and a discharge pipe 3 for discharging the compressed high-pressure refrigerant to the outside of the compressor 101 is attached to the upper container 1a. ..
- the internal space of the container 1 is divided into a suction space 19 on the suction pipe 2 side and a discharge space 20 on the discharge pipe 3 side by the compression mechanism unit 30 and the frame 4, and the electric mechanism unit 40 is arranged in the suction space 19. There is.
- the suction space 19 is filled with the low-pressure refrigerant sucked from the suction pipe 2 to form a low-pressure space. Further, the discharge space 20 is filled with the high-pressure refrigerant compressed by the compression mechanism unit 30 to form a high-pressure space.
- the space between the suction space 19 and the discharge space 20 is referred to as a compression space 25.
- An oil storage unit 16 for storing oil is provided at the bottom of the container 1.
- an oil pump 18 for pumping up the oil accumulated in the oil storage unit 16 is provided at the end of the rotating shaft 5 on the subframe 10 side.
- An oil supply pipe 17 extending toward the oil storage unit 16 is connected to the oil pump 18, and a suction port 17a formed at the tip of the oil supply pipe 17 is immersed in the oil of the oil storage unit 16. Then, the oil pump 18 pumps up the oil accumulated in the oil storage portion 16 via the oil supply pipe 17, and passes through the oil supply pipeline 13 formed inside the rotary shaft 5 to each sliding portion in the compressor 101, for example. Oil is supplied to the power conversion mechanism unit 6 and the like.
- the oil level height position of the oil storage unit 16 changes depending on the usage environment or operating conditions of the compressor 101. Therefore, in order to prevent the supply of oil to each sliding portion in the compressor 101 from being interrupted, the height position of the suction port 17a is adjusted so that the suction port 17a is immersed in the oil under all conditions.
- the oil pump 18 is provided at the end of the rotary shaft 5 on the subframe 10 side, but the present invention is not limited to this, and the oil pump 18 may be provided at the end of the rotary shaft 5 on the frame 4 side. good. Further, as the oil pump 18, those having various structures can be used.
- the frame 4 is provided with a suction hole 14 that serves as a flow path for the refrigerant to flow from the suction space 19 to the compression chamber 9.
- the frame 4 and the fixed scroll 8 are provided with a discharge hole 15 that serves as a flow path for the refrigerant to flow from the compression chamber 9 to the discharge space 20.
- a check valve 21 for suppressing the backflow of the refrigerant from the discharge space 20 to the compression chamber 9 is provided at the outlet end of the discharge hole 15.
- the discharge space 20 is provided with a discharge pipe 3 for discharging the refrigerant to the outside of the compressor 101.
- a centrifugal separation unit 60 is provided between the discharge hole 15 and the discharge pipe 3, and most of the refrigerant compressed in the compression chamber 9 and discharged from the discharge hole 15 passes through the centrifugal separation unit 60. It is designed to be discharged to the outside of the compressor 101 from the discharge pipe 3. Further, an oil collecting unit 20a is provided on the outside of the centrifugal separation unit 60, and the oil separated by the centrifugal separation unit 60 is collected by the oil collecting unit 20a.
- the frame 4 is fixed to the inner surface of the side container 1b by shrink fitting or the like.
- the centrifuge 60 has a cylindrical portion 23 having a plurality of holes 23a (see FIG. 3 to be described later) on the side wall, and the direction of the refrigerant flow discharged from the discharge holes 15 is changed in the circumferential direction of the cylindrical portion 23.
- a swirling mechanism portion 22 is provided in the cylindrical portion 23 so as to flow toward the head and generate a swirling flow.
- the discharge pipe 3 is arranged so as to be located on the central axis of the cylindrical portion 23.
- the compression space 25 and the suction space 19 are provided with oil return pipes 51 and 24, respectively, which form a flow path for oil return from the oil collection unit 20a to the oil storage unit 16.
- the details of the oil return pipes 51 and 24 will be described later.
- FIG. 2 is a perspective view of the swivel mechanism unit 22 in the centrifugal separation unit 60 of the compressor 101 according to the first embodiment.
- the dotted arrow in FIG. 2 indicates the flow of the refrigerant and the oil inside the swivel mechanism portion 22.
- the swivel mechanism portion 22 is arranged so as to cover the discharge hole 15 and the check valve 21 so as to change the directions of the refrigerant and the oil discharged from the discharge hole 15 and the check valve 21 to generate a swirl flow.
- a spiral flow path 22a is formed.
- an outlet 22b for blowing out the refrigerant and the oil in the circumferential direction of the cylindrical portion 23 is provided.
- FIG. 3 is a perspective view of a cylindrical portion 23 in the centrifuge portion 60 of the compressor 101 according to the first embodiment.
- the solid arrow in FIG. 3 indicates the flow of the refrigerant, and the dotted arrow in FIG. 3 indicates the flow of oil.
- the cylindrical portion 23 is provided with a swirling mechanism portion 22 inside, so that a swirling flow is formed inside the cylindrical portion 23.
- the side wall of the cylindrical portion 23 is provided with a plurality of holes 23a for discharging the oil separated from the refrigerant by the centrifugal force of the swirling flow to the oil collecting portion 20a outside the cylindrical portion 23.
- a discharge pipe 3 for discharging the refrigerant from which the oil has been separated to the outside of the compressor 101 is arranged.
- FIG. 4 is a cross-sectional view of the oil return pipes 51 and 24 of the compressor 101 according to the first embodiment and their surroundings.
- the dotted arrow in FIG. 4 indicates the flow of oil.
- a fixed scroll oil return pipe hole is formed on the side of the fixed scroll 8.
- the fixed scroll oil return pipe hole includes a fixed scroll oil return pipe upper hole 8f formed in the upper part of the fixed scroll 8, a fixed scroll oil return pipe lower hole 8d formed in the lower part of the fixed scroll 8, and a fixed scroll oil return. It is formed between the pipe upper hole 8f and the fixed scroll oil return pipe pilot hole 8d, and is composed of a fixed scroll oil through pipe middle hole 8e that communicates with them.
- a frame oil return pipe hole is formed on the side of the frame 4.
- the frame oil return pipe holes include a frame oil return pipe upper hole 4a formed in the upper part of the frame 4, a frame oil return pipe lower hole 4c formed in the lower part of the frame 4, a frame oil return pipe upper hole 4a, and a frame. It is composed of a frame oil through hole 4b formed between the oil return pipe pilot hole 4c and communicating with them.
- the oil return pipe 51 is provided between the fixed scroll oil return pipe pilot hole 8d and the frame oil return pipe upper hole 4a. Further, the oil return pipe 24 is provided so as to extend from the frame oil return pipe pilot hole 4c toward the oil storage portion 16.
- the oil return pipe 51 and the oil return pipe 24 communicate with each other via the frame oil through hole 4b. Further, the oil return pipe 51 and the oil return pipe 24 communicate with the fixed scroll oil return pipe middle hole 8e and the fixed scroll oil return pipe upper hole 8f. In this way, the oil return pipes 51 and 24 form a flow path for oil return from the oil collection unit 20a to the oil storage unit 16.
- FIG. 5 is a diagram showing the periphery of the spiral laps 7a and 8a of the oscillating scroll 7 and the fixed scroll 8 of the compressor according to the first embodiment.
- the frame outer wallless structure it is necessary to match the rotation phases of the frame 4 and the fixed scroll 8, and at that time, it is necessary to phase and fasten the frame 4 and the fixed scroll 8 with a fixing member 80 such as a pin. be.
- a fixing member 80 such as a pin.
- the number of parts and processing points can be reduced by integrating the fixing member 80 for fastening the frame 4 and the fixed scroll 8 with the oil return pipes 51 and 24. The cost can be reduced.
- the fixing member 80 and the oil return pipes 51 and 24 are not integrated, it is necessary to secure a space for the fixing member and a space for the oil return pipes 51 and 24 outside the outer diameters of the spiral wraps 7a and 8a. There is.
- the cylindrical portion 23 is at a high position above the swivel mechanism portion 22 and extends to the vicinity of the inlet of the discharge pipe 3.
- the lower end of the cylindrical portion 23 is in close contact with the upper surface of the frame 4 and is connected without a gap.
- the hole 23a is not formed at a height at which the swirling mechanism portion 22 blows out the refrigerant, that is, at a height at which a swirling flow starts to occur, but is formed immediately above the hole 23a.
- the distance from the height of the outlet 22b of the swivel mechanism portion 22 to the height of the lower end of the region where the hole 23a is formed, that is, the height of the bottom hole 23a is preferably smaller than the height of the swivel mechanism portion 22.
- the height of the region where the plurality of holes 23a are formed is larger than the height of the swivel mechanism portion 22, and it is preferable that the height is, for example, 2 to 5 times.
- the opening ratio of the region having a plurality of holes 23a on the side surface of the cylindrical portion 23 is preferably less than, for example, 50%. This is because if the aperture ratio is too high, the amount of refrigerant gas leaking to the outside of the cylindrical portion 23 through the hole 23a may increase, and a stable swirling flow may not be formed inside the cylindrical portion 23.
- the oil collecting portion 20a is a space surrounded by the outer peripheral surface of the cylindrical portion 23, the inner wall surface of the upper container 1a, and the upper surface of the fixed scroll 8, and is centrifugally separated in the discharge space 20. It is provided on the outside of the portion 60. Then, the oil discharged from the plurality of holes 23a of the cylindrical portion 23 of the centrifugal separation portion 60 is collected by the oil collecting portion 20a.
- the lower surface of the oil collecting portion 20a functions as an oil receiving surface that receives and temporarily holds the oil discharged downward from the centrifuge section 60 to the oil collecting portion 20a and collected downward due to gravity.
- the oil return pipes 51 and 24 are used as an oil return flow path for returning the oil discharged from the centrifuge section 60 and collected in the oil collection section 20a to the oil storage section 16 of the suction space 19. Is provided in the compression space 25 and the suction space 19.
- the oil recovered in the oil collecting unit 20a flows to the oil storage unit 16 on the suction space 19 side together with a part of the refrigerant due to the pressure difference between the discharge space 20 and the suction space 19.
- the end of the oil return pipe 51 on the side of the oil collection section 20a is collected by the oil collection section 20a and flows by gravity so that the oil collected at the lower position of the oil collection section 20a flows into the oil collection section 51.
- the portion 20a is arranged at a lower position, preferably at a position lower than the upper surface of the fixed scroll 8. Further, it is preferable that the diameter of the internal flow path of the oil return pipes 51 and 24 is adjusted so that the oil does not accumulate too much in the oil collecting portion 20a and flows smoothly to the oil storage portion 16. Moreover, the diameter of the internal flow path of the oil return pipes 51 and 24 does not decrease the compression efficiency or the volumetric efficiency because the amount of the refrigerant flowing from the discharge space 20 to the suction space 19 side through the oil return pipes 51 and 24 is too large. It should be adjusted to the size.
- oil return pipes 51 and 24 join the oil flow path that lubricates the power conversion mechanism unit 6 through the oil supply pipe line 13 and flows out while flowing from the oil collection unit 20a to the oil storage unit 16 and sucks the oil. Oil may be discharged to the space 19.
- the frame 4 or the fixed scroll 8 is supplied with oil to the power conversion mechanism unit 6 through the oil supply pipeline 13 in order to lubricate the spiral wrap 7a of the swing scroll 7 and the spiral wrap 8a of the fixed scroll 8.
- a flow path (not shown) may be provided to allow a part of the above to flow to the suction hole 14 or the compression chamber 9.
- the refrigerant containing oil that has flowed into the compression chamber 9 is compressed and flows into the swirling mechanism portion 22 of the centrifugal separation portion 60 through the discharge hole 15 and the check valve 21. Further, the oil that has flowed into the compression chamber 9 lubricates the swirl wrap 7a of the swing scroll 7 and the swirl wrap 8a of the fixed scroll 8, and flows into the swirl mechanism portion 22 together with the refrigerant.
- the refrigerant and the oil form a swirling flow and flow into the inside of the cylindrical portion 23, and in the cylindrical portion 23, the refrigerant and the oil are separated by the centrifugal force of the swirling flow.
- the oil separated from the refrigerant rises while swirling inside the cylindrical portion 23, and is discharged from the discharge pipe 3 to the outside of the compressor 101.
- the oil separated from the refrigerant is discharged from the plurality of holes 23a formed in the wall surface of the cylindrical portion 23 to the oil collecting portion 20a outside the cylindrical portion 23, and reaches the oil storage portion 16 through the oil return pipes 51 and 24. It flows.
- the swirling mechanism portion 22 generates a swirling flow at the lower part of the cylindrical portion 23. Then, the generated swirling flow rises while flowing along the inner wall surface of the cylindrical portion 23, and is eventually discharged to the outside of the container 1 from the discharge pipe 3 near the center of the cylindrical portion 23.
- a strong centrifugal force acts on the oil having a higher density than the refrigerant gas (oil droplets and oil mist contained in the refrigerant gas), and the oil flies toward the inner wall of the cylindrical portion 23. It will be like.
- the oil discharged to the oil collecting portion 20a falls due to gravity, or after adhering to the outer wall surface of the cylindrical portion 23 or the inner wall surface of the upper container 1a, flows by gravity and is fixed to the lower surface of the oil collecting portion 20a. Gather on the top of the scroll 8.
- the oil collected on the upper surface of the fixed scroll 8 flows through the oil return pipes 51 and 24 together with a part of the refrigerant due to gravity and the pressure difference between the discharge space 20 and the suction space 19, and is discharged to the suction space 19.
- a part of the oil discharged to the suction space 19 becomes oil droplets and flows into the compression chamber 9 again through the suction hole 14, but most of the oil flows to the lower oil storage portion 16 due to gravity.
- the oil adhering to the inner wall surface of the cylindrical portion 23 due to the centrifugal force of the swirling flow in the centrifugal separation portion 60 is discharged from the plurality of holes 23a formed in the wall surface of the cylindrical portion 23.
- the oil is quickly discharged to the oil collecting portion 20a on the outside of the portion 23.
- the amount of oil discharged from the discharge pipe 3 to the outside of the compressor 101 can be significantly reduced.
- the amount of oil discharged to the outside of the compressor 101 can be sufficiently reduced. It will be possible.
- the lower end of the cylindrical portion 23 is connected to the lower surface of the oil collecting portion 20a without a gap, and a hole 23a is formed in the lower region of the side surface of the cylindrical portion 23 adjacent to the lower end of the cylindrical portion 23. It is preferable that there is no such thing. That is, it is preferable that the hole 23a is not formed at a certain height from the lower end of the cylindrical portion 23. For example, it is preferable that the hole 23a is not formed below the height of the outlet 22b of the swivel mechanism portion 22. As a result, the lower region of the side wall of the cylindrical portion 23 becomes a partition, so that the oil collected on the lower surface of the oil collecting portion 20a is suppressed from entering the inside of the cylindrical portion 23.
- the swirling flow inside the cylindrical portion 23 does not blow out to the outside of the cylindrical portion 23, it is possible to prevent the oil collected on the lower surface of the oil collecting portion 20a from being wound up. As a result, the amount of oil discharged to the outside of the compressor 101 can be further reduced.
- the oil adhering to the inner wall surface of the lower cylindrical portion 23 in which the hole 23a is not formed or the bottom surface of the cylindrical portion 23 is inside the cylindrical portion 23 due to the rising refrigerant gas flow while swirling. It is pushed up to the hole 23a along the wall surface, and is pushed out of the cylindrical portion 23 from the hole 23a. Therefore, a large amount of oil does not collect inside the cylindrical portion 23.
- the hole 23a provided on the side surface of the cylindrical portion 23 is not formed at the same height as the outlet 22b of the swivel mechanism portion 22.
- the refrigerant gas ejected from the outlet 22b of the swirling mechanism portion 22 can be reliably flowed along the inner wall surface of the cylindrical portion 23 to form a strong and stable swirling flow.
- the "same" height does not have to be exactly the same, but means that the height is substantially the same so that the refrigerant gas ejected from the outlet 22b of the swivel mechanism portion 22 directly hits the height. ing.
- the strength of the swirling flow is strongest immediately after exiting from the outlet 22b of the swirling mechanism portion 22, and tends to weaken as it rises from the outlet 22b of the swirling mechanism portion 22 toward the discharge pipe 3. Therefore, if the region forming the hole 23a exists at the height immediately above the outlet 22b of the swivel mechanism portion 22, the oil can be more efficiently discharged to the outside of the cylindrical portion 23.
- the distance from the height of the outlet 22b of the swivel mechanism portion 22 to the height of the lower end of the region where the hole 23a is formed, that is, the height of the bottom hole 23a may be smaller than the height of the swivel mechanism portion 22. ..
- the total ratio of the opening areas of the holes 23a in the region is preferably less than 50%, for example. If the ratio of the opening area of the hole 23a is too large, the amount of the refrigerant leaking to the outside of the cylindrical portion 23 through the hole 23a increases, the amount of the refrigerant inside the cylindrical portion 23 decreases, the swirling flow weakens, and oil separation occurs. Efficiency may decrease. By reducing the ratio of the opening area, the amount of the refrigerant leaking to the outside of the cylindrical portion 23 through the hole 23a can be reduced, and a strong swirling flow can be formed inside the cylindrical portion 23.
- the amount of oil discharged from the compressor 101 can be reduced even when starting from a state in which a large amount of liquefied refrigerant is accumulated inside the compressor 101.
- the compressor 101 When the compressor 101 is stopped, the refrigerant gas inside the compressor 101 may be liquefied, and a large amount of the liquefied refrigerant may be accumulated in the suction space 19 inside the compressor 101.
- a large amount of oil flows into the compression chamber 9 through the suction hole 14 and is discharged by foaming of the oil storage unit 16 due to sudden vaporization of the refrigerant or stirring by the rotor 11. It flows into the discharge space 20 through the hole 15. At this time, if the oil cannot be returned to the oil storage unit 16 by the oil return pipe 51, the oil will temporarily accumulate in the discharge space 20.
- a large amount of oil that has flowed into the discharge space 20 is discharged to a wide oil collecting portion 20a outside the cylindrical portion 23 through the plurality of holes 23a and is accumulated. Therefore, a large amount of oil is not continuously exposed to the violent swirling flow of the refrigerant inside the cylindrical portion 23, and the oil level is not rolled up.
- the lower portion of the cylindrical portion 23 is connected to the upper surface of the fixed scroll 8 which is the lower surface of the oil collecting portion 20a without a gap, and the hole 23a is not formed in the lower region of the side wall of the cylindrical portion 23.
- this portion serves as a partition, and the oil held in the oil collecting portion 20a on the outside of the cylindrical portion 23 does not infiltrate into the inside of the cylindrical portion 23. Moreover, since the swirling flow inside the cylindrical portion 23 does not come out from the lower part of the cylindrical portion 23 to the outside of the cylindrical portion 23, it is possible to prevent the oil accumulated in the low position of the oil collecting portion 20a from being wound up.
- the refrigerant compressed in the compression chamber 9 immediately flows into the swirling mechanism portion 22 through the discharge hole 15 to form a swirling flow, and then rises and discharges while swirling inside the cylindrical portion 23. It is discharged from the pipe 3 to the outside of the compressor 101. Therefore, bending, sudden expansion, and sudden contraction of the flow path can be minimized. Therefore, the pressure loss is small and the decrease in compression efficiency is suppressed.
- the first embodiment can reduce the noise generated during the operation of the compressor 101.
- the discharge space 20 of the compressor 101 is separated into an outer space and an inner space by a cylindrical portion 23, and both spaces communicate with each other through a plurality of holes 23a.
- This structure has a resonance type muffling structure, and can significantly reduce noise in a specific frequency band in particular.
- the thickness or cross-sectional area of the cylindrical portion 23 and the number or cross-sectional area of the plurality of holes 23a provided in the cylindrical portion 23 are adjusted to reduce noise in the frequency band to be reduced. You may adjust.
- the amount of oil discharged to the outside of the compressor 101 can be reduced by separating the oil by the centrifuge 60 even without the outer wall of the frame, aiming at low cost and space saving. be able to.
- the compressor 101 is arranged inside the container 1 having the oil storage unit 16, the suction pipe 2 for sucking the refrigerant from the outside of the container 1, and the suction pipe 2 for sucking. It passes through a compression mechanism unit 30 that compresses the refrigerant, a frame 4 that fixes the compression mechanism unit 30 to the container 1, a centrifugal separation unit 60 that separates oil from the refrigerant compressed by the compression mechanism unit 30, and a centrifugal separation unit 60.
- a frame outer wall provided with a discharge pipe 3 for discharging the generated refrigerant from the upper part of the container 1 to the outside, and an oil collecting unit 20a provided on the outside of the centrifugal separation unit 60 for collecting the oil discharged from the centrifugal separation unit 60.
- the compressor 101 has a less structure and includes oil return pipes 51 and 24 for returning the oil recovered in the oil collecting unit 20a to the oil storage unit 16.
- the centrifuge section 60 is provided inside a cylindrical portion 23 having a plurality of holes 23a on the side surface and a lower region of the cylindrical portion 23, and blows out a refrigerant compressed by the compression mechanism portion 30 to blow out the cylindrical portion 23.
- It has a swirling mechanism portion 22 that forms a swirling flow that flows toward the discharge pipe 3 at the upper part of the container 1 while swirling inside the container 1, and separates oil from the refrigerant by the centrifugal force of the swirling flow. Is discharged to the oil collecting section 20a through the hole 23a, and then discharged to the oil storage section 16 through the oil return pipes 51 and 24.
- the oil collecting unit 20a includes oil return pipes 51 and 24 for returning the collected oil to the oil storage unit 16, and the centrifugal separation unit 60 provides a refrigerant by the centrifugal force of the swirling flow.
- the oil is separated from the oil, and the separated oil is discharged to the oil collecting section 20a through the holes 23a, and then the oil is discharged to the oil storage section 16 through the oil return pipes 51 and 24. Therefore, even if the frame has an outer wallless structure, the separated oil can be returned to the oil storage unit 16.
- an HFC-based refrigerant an HFC-based refrigerant, an HC-based refrigerant, or a natural-based refrigerant is used as the refrigerant.
- an HFC-based refrigerant, an HC-based refrigerant, or a natural-based refrigerant is used as the refrigerant, and these refrigerants have a low global warming potential (GWP), resulting in global warming. The effect on can be reduced.
- GWP global warming potential
- Embodiment 2 Hereinafter, the second embodiment will be described, but the points where the second embodiment is different from the first embodiment will be mainly described.
- FIG. 6 is a schematic cross-sectional view showing the configuration of the compressor 101 according to the second embodiment.
- the dotted arrow in FIG. 6 indicates the main oil flow.
- the compressor 101 has a first oil return outer pipe 52 for discharging the oil of the oil collecting portion 20a in the high pressure space to the outside of the compressor 101, and a first oil return outer pipe.
- a second oil return outer pipe 53 for returning the oil discharged from the pipe 52 to the suction pipe 2 is provided. Then, the compressor 101 returns the oil in the oil collecting portion 20a in the high pressure space from the first oil return outer pipe 52 facing the outside of the compressor 101 to the suction pipe 2 via the second oil return outer pipe 53. There is.
- the oil temperature was high because the high pressure oil was returned to the low pressure.
- the compressor 101 according to the second embodiment in order to return the high-pressure oil to the suction pipe 2 by using the first oil return outer pipe 52 and the second oil return outer pipe 53, the refrigerant flowing through the suction pipe 2 is cooled. Therefore, the oil temperature can be reduced.
- the performance and reliability can be further improved by reducing the oil noise.
- the oil collected in the oil collecting unit 20a is discharged from the side portion of the container 1 to the outside from the first oil return outer pipe 52 and the first oil return outer pipe 52. It is provided with a second oil return outer pipe 53 for returning the discharged oil to the suction pipe 2.
- the oil collected in the oil collecting portion 20a is discharged from the side portion of the container 1 to the outside from the first oil return outer pipe 52 and the first oil return outer pipe 52. It is equipped with a second oil return outer pipe 53 that returns the discharged oil to the suction pipe 2, and in order to return the high-pressure oil to the suction pipe 2, the oil temperature is reduced by cooling the refrigerant flowing through the suction pipe 2. Can be done.
- Embodiment 3 Hereinafter, the third embodiment will be described, but the differences between the third embodiment and the first and second embodiments will be mainly described.
- FIG. 7 is a diagram showing a configuration example of the refrigeration cycle apparatus according to the third embodiment. Note that FIG. 7 shows an air conditioner as a refrigeration cycle device. Further, the solid line arrow in FIG. 7 indicates the flow of the refrigerant during the cooling operation, and the broken line arrow indicates the flow during the heating operation.
- the air conditioner shown in FIG. 7 comprises a refrigerant circuit in which the outdoor unit 100 and the indoor unit 200 are connected by a gas refrigerant pipe 300 and a liquid refrigerant pipe 400 to circulate the refrigerant.
- the outdoor unit 100 has the compressor 101 described in the first embodiment and the second embodiment. Further, the outdoor unit 100 has a flow path switching device 102, an outdoor heat exchanger 103, and a throttle device 104. Further, the indoor unit 200 has an indoor heat exchanger 201.
- the compressor 101 compresses and discharges the sucked refrigerant.
- the compressor 101 may be capable of arbitrarily changing the operating frequency by, for example, an inverter circuit or the like.
- the flow path switching device 102 is, for example, a four-way valve, and switches between cooling operation and heating operation by switching the flow direction of the refrigerant.
- a combination of a two-way valve and a three-way valve may be used instead of the four-way valve.
- the outdoor heat exchanger 103 exchanges heat between the refrigerant and air (outdoor air). For example, it functions as an evaporator during heating operation to evaporate and vaporize the refrigerant. In addition, it functions as a condenser during cooling operation to condense and liquefy the refrigerant.
- the drawing device 104 decompresses and expands the refrigerant. For example, in the case of an electronic expansion valve or the like, the opening degree is adjusted based on an instruction from a control device (not shown) or the like.
- the indoor heat exchanger 201 exchanges heat between, for example, air to be air-conditioned and a refrigerant. During heating operation, it functions as a condenser and condenses and liquefies the refrigerant. It also functions as an evaporator during cooling operation to evaporate and vaporize the refrigerant.
- the compressor 101 described in the first embodiment and the second embodiment since the compressor 101 described in the first embodiment and the second embodiment is provided as an apparatus, the first embodiment and the second embodiment are provided. The same effect as that of the compressor 101 described in the above can be obtained.
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Abstract
Description
図1は、実施の形態1に係る圧縮機101の構成を示す概略断面図である。なお、図1の二重線の矢印は重力方向を示し、点線の矢印は油の主な流れを示している。
図1に示すように、実施の形態1に係る圧縮機101は、冷媒を圧縮する圧縮機構部30と、圧縮機構部30を駆動する電動機構部40と、電動機構部40の回転駆動力を受け取って圧縮機構部30に伝達する回転軸5と、圧縮機構部30および電動機構部40を収容する容器1と、を備えている。容器1内にはさらに、圧縮機構部30を容器1に固定するフレーム4が圧縮機構部30と電動機構部40との間に設けられている。なお、圧縮機101が圧縮する冷媒としては、HFC系冷媒、HC系冷媒または自然系冷媒が用いられる。これらの冷媒は地球温暖化係数(GWP)が低いため、地球温暖化への影響を少なくすることができる。
以下、実施の形態2について説明するが、実施の形態2が実施の形態1と異なる点を中心に説明する。
以下、実施の形態3について説明するが、実施の形態3が実施の形態1および2と異なる点を中心に説明する。
Claims (5)
- 貯油部を有する容器と、
前記容器の外部から冷媒を吸入する吸入配管と、
前記容器の内部に配置され、前記吸入配管が吸入した冷媒を圧縮する圧縮機構部と、
前記圧縮機構部を前記容器に固定するフレームと、
前記圧縮機構部で圧縮された冷媒から油を分離する遠心分離部と、
前記遠心分離部を通過した冷媒を前記容器の上部から外部に吐出する吐出配管と、
前記遠心分離部の外側に設けられ、前記遠心分離部から排出された油を回収する集油部と、を備えたフレーム外壁レス構造を有する圧縮機であって、
前記集油部に回収された油を前記貯油部へ戻す油戻し管を備え、
前記遠心分離部は、
側面に複数の孔を有する円筒部と、
前記円筒部の下部領域の内側に設けられ、前記圧縮機構部で圧縮された冷媒を吹き出すことにより、前記円筒部の内側を旋回しながら前記容器の上部の前記吐出配管に向かって流れる旋回流を形成する旋回機構部と、を有し、
前記旋回流の遠心力により冷媒から油を分離し、分離された油を、前記孔を通じて前記集油部へ排出した後、前記油戻し管にて前記貯油部へ排出する
圧縮機。 - 前記圧縮機構部は固定スクロールを有し、
前記油戻し管は、
前記固定スクロールの側部に形成された固定スクロール油戻し管穴と前記フレームの側部に形成されたフレーム油戻し管穴との間に設けられており、さらに、前記フレーム油戻し管穴から前記貯油部に向かって延びるように設けられている
請求項1に記載の圧縮機。 - 前記集油部に回収された油を前記容器の側部から外部に吐出する第一油戻し外配管と、
前記油戻し管から吐出された油を前記吸入配管へ戻す第二油戻し外配管と、を備えた
請求項1または2に記載の圧縮機。 - 前記冷媒としてHFC系冷媒、HC系冷媒または自然系冷媒が用いられる
請求項1~3のいずれか一項に記載の圧縮機。 - 請求項1~4のいずれか一項に記載の圧縮機、凝縮器、絞り装置、および、蒸発器が配管で接続され、冷媒が循環する冷媒回路を備えた冷凍サイクル装置。
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JP2009074485A (ja) * | 2007-09-21 | 2009-04-09 | Mitsubishi Electric Corp | スクロール圧縮機 |
WO2019102673A1 (ja) * | 2017-11-27 | 2019-05-31 | 三菱電機株式会社 | 圧縮機および冷凍サイクル装置 |
WO2020157792A1 (ja) * | 2019-01-28 | 2020-08-06 | 三菱電機株式会社 | スクロール圧縮機 |
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JP2009074485A (ja) * | 2007-09-21 | 2009-04-09 | Mitsubishi Electric Corp | スクロール圧縮機 |
WO2019102673A1 (ja) * | 2017-11-27 | 2019-05-31 | 三菱電機株式会社 | 圧縮機および冷凍サイクル装置 |
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