WO2021020346A1 - Compresseur - Google Patents

Compresseur Download PDF

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Publication number
WO2021020346A1
WO2021020346A1 PCT/JP2020/028707 JP2020028707W WO2021020346A1 WO 2021020346 A1 WO2021020346 A1 WO 2021020346A1 JP 2020028707 W JP2020028707 W JP 2020028707W WO 2021020346 A1 WO2021020346 A1 WO 2021020346A1
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WO
WIPO (PCT)
Prior art keywords
balance weight
compression mechanism
refrigerant
electric motor
drive shaft
Prior art date
Application number
PCT/JP2020/028707
Other languages
English (en)
Japanese (ja)
Inventor
隆司 東田
里　和哉
努 昆
昭徳 福田
Original Assignee
パナソニックＩｐマネジメント株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by パナソニックＩｐマネジメント株式会社 filed Critical パナソニックＩｐマネジメント株式会社
Publication of WO2021020346A1 publication Critical patent/WO2021020346A1/fr

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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
    • 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

Definitions

  • the present invention relates to a compressor used in an outdoor unit of an air conditioner or a refrigerator.
  • Patent Document 1 includes a first seal member provided between the balance weight and the swivel scroll and a second seal member provided between the balance weight and the frame, thereby causing an excess inside the compressor. It suppresses the supply of oil.
  • Patent Document 1 since the gap between the balance weight press-fitted and fixed to the crankshaft and the parts formed above and below the balance weight is sealed with a sealing material, the sealing material is worn or broken due to contact between the rotating body and the sealing material. It is difficult to ensure reliability because of the risk of such problems. In addition, since the number of parts increases, it leads to an increase in assembly man-hours and costs.
  • the present invention provides a compressor that can reduce the mixing of lubricating oil discharged from the communication holes with the refrigerant by bringing the lower end surface of the balance weight closer to the electric motor portion without using a separate member such as a sealing material.
  • the purpose is to do.
  • the compressor of the present invention includes a compression mechanism unit 20 and an electric motor unit 30 in a closed container 10, the compression mechanism unit 20 is arranged above the electric motor unit 30, and the compression mechanism unit 20 is provided. And the electric motor unit 30 are connected by a drive shaft 40, a balance weight 90 is arranged above the electric motor unit 30 and below the compression mechanism unit 20, and the balance weight 90 is connected to the drive shaft 40 by the connecting unit 91.
  • An oil reservoir 15 is formed in the inner bottom portion 14 of the closed container 10 so as to be fixed, and the lubricating oil stored in the oil reservoir 15 is guided to the compression mechanism portion 20 and the bearing 61 on the drive shaft 40.
  • the electric motor unit 30 is fixed to the annular stator 31 and the drive shaft 40 and rotatably arranged inside the stator 31.
  • the present invention according to claim 3 is characterized in that, in the compressor according to claim 2, the gap dimension S is 20% or more and 60% or less of the diameter D of the communication hole 44.
  • the compressor of the present invention according to claim 4 is the compressor according to claim 2 or 3, wherein the gap dimension S is 1 mm or more and 2.7 mm or less.
  • the compressor of the present invention according to claim 5 is the compressor according to any one of claims 1 to 4, wherein the inside of the closed container 10 is divided into upper and lower partitions.
  • the low-pressure space 17 is divided into a low-pressure space 17 filled with the low-pressure refrigerant, and the electric motor unit 30, the compression mechanism unit 20, and the balance weight 90 are arranged in the low-pressure space 17, and the low-pressure space 17 is located.
  • the refrigerant is compressed by the compression mechanism unit 20.
  • the lower end surface of the balance weight can be brought close to the electric motor portion, it is possible to reduce the mixing of the lubricating oil discharged from the communication hole with the refrigerant and reduce the amount of oil discharged from the closed container. ..
  • the lower end surface of the balance weight is projected below the lower end of the connecting portion of the balance weight. According to the present embodiment, since the lower end surface of the balance weight can be brought close to the electric motor portion, it is possible to reduce the mixing of the lubricating oil discharged from the communication hole with the refrigerant, and the lubricating oil is mixed with the refrigerant and compressed. The amount of oil discharged from the closed container that flows out into the refrigeration cycle together with the refrigerant can be reduced.
  • the second embodiment of the present invention comprises an annular stator and a rotor fixed to a drive shaft and rotatably arranged inside the stator.
  • the gap between the lower end surface of the balance weight and the rotor is made smaller than the diameter of the communication hole.
  • the third embodiment of the present invention is the compressor according to the second embodiment in which the gap size is 20% or more and 60% or less of the diameter of the communication hole. According to the present embodiment, since the lubricating oil discharged from the communication hole is less likely to come out from the rotor, it is possible to reduce the mixing of the lubricating oil with the refrigerant, and the lubricating oil is mixed with the refrigerant and frozen together with the compressed refrigerant. The amount of oil discharged from the closed container that flows out into the cycle can be reduced.
  • the fourth embodiment of the present invention has a gap size of 1 mm or more and 2.7 mm or less in the compressor according to the second or third embodiment. According to the present embodiment, since the lubricating oil discharged from the communication hole is less likely to come out from the rotor, it is possible to reduce the mixing of the lubricating oil with the refrigerant, and the lubricating oil is mixed with the refrigerant and frozen together with the compressed refrigerant. The amount of oil discharged from the closed container that flows out into the cycle can be reduced.
  • a partition plate for partitioning the inside of the closed container is provided in the closed container, and the partition plate is used.
  • the inside of the closed container is divided into a high-pressure space filled with a high-pressure refrigerant after being compressed by the compression mechanism and a low-pressure space filled with a low-pressure refrigerant before being compressed by the compression mechanism.
  • the electric motor unit, the compression mechanism unit, and the balance weight are arranged, and the refrigerant in the low pressure space is compressed by the compression mechanism unit.
  • the lubricating oil discharged from the communication hole is mixed with the refrigerant in the low-pressure space, so that the lubricating oil mixed in the refrigerant in the low-pressure space is mixed.
  • FIG. 1 is a side sectional view of the compressor according to the present embodiment.
  • a scroll compressor is used as the compressor.
  • the closed container 10 has a cylindrical body shell 11 having an axis in the vertical direction, a bowl-shaped lower shell 12 that is airtightly welded to the lower end of the body shell 11, and a bowl that is airtightly welded to the upper end of the body shell 11. It is formed by the upper shell 13 in the shape.
  • An oil reservoir 15 is formed in the inner bottom 14 of the closed container 10.
  • the airtight container 10 is provided with a compression mechanism unit 20 and an electric motor unit 30.
  • the compression mechanism unit 20 is arranged above the electric motor unit 30.
  • the compression mechanism unit 20 and the electric motor unit 30 are connected by a drive shaft 40.
  • the compression mechanism unit 20 is composed of a fixed scroll 21 and a swivel scroll 22.
  • the fixed scroll 21 is composed of a end plate 21a and a spiral (involute) wrap 21b formed on the lower surface of the end plate 21a.
  • the swivel scroll 22 is composed of a end plate 22a and a spiral (involute) wrap 22b formed on the upper surface of the end plate 22a.
  • a cylindrical boss 24 is provided at the center of the lower surface of the end plate 22a of the swivel scroll 22.
  • the lap 21b of the fixed scroll 21 and the lap 22b of the swivel scroll 22 are meshed with each other, and a plurality of compression chambers 23 are formed between the fixed scroll 21 and the swivel scroll 22 by both laps 21b and 22b.
  • a discharge hole 25 is provided in the central portion of the end plate 21a of the fixed scroll 21, and a discharge valve 26 is provided in the discharge hole 25.
  • a suction unit 28 for sucking a low-pressure refrigerant is provided on the outer circumference of the fixed scroll 21.
  • the electric motor unit 30 is composed of an annular stator 31 and a rotor 32 rotatably configured inside the stator 31.
  • the stator 31 is fixed to the inner peripheral surface of the closed container 10.
  • the rotor 32 is fixed to the drive shaft 40.
  • a partition plate 50 that partitions the inside of the closed container 10 up and down is provided above the inside of the closed container 10.
  • the partition plate 50 divides the inside of the closed container 10 into a high-pressure space 16 and a low-pressure space 17.
  • the high-pressure space 16 is a space filled with the high-pressure refrigerant after being compressed by the compression mechanism unit 20
  • the low-pressure space 17 is a space filled with the low-pressure refrigerant before being compressed by the compression mechanism unit 20.
  • the closed container 10 includes a refrigerant suction pipe 18 that communicates the outside of the closed container 10 with the low pressure space 17, and a refrigerant discharge pipe 19 that communicates the outside of the closed container 10 with the high pressure space 16.
  • the compressor introduces a low-pressure refrigerant into the low-pressure space 17 from a refrigeration cycle circuit (not shown) provided outside the closed container 10 via a refrigerant suction pipe 18. Further, the high-pressure refrigerant compressed by the compression mechanism unit 20 is first introduced into the high-pressure space 16. After that, it is discharged from the high pressure space 16 to the refrigeration cycle circuit via the refrigerant discharge pipe 19.
  • a main bearing 60 for supporting the swivel scroll 22 is provided below the fixed scroll 21 and the swivel scroll 22, a main bearing 60 for supporting the swivel scroll 22 is provided.
  • the swivel scroll 22 is arranged between the fixed scroll 21 and the main bearing 60.
  • the main bearing 60 has a bearing 61 formed in the center thereof and is fixed to the inner wall of the closed container 10.
  • a rotation suppressing member (oldam ring) 27 is provided between the swivel scroll 22 and the main bearing 60.
  • the old dam ring 27 prevents the turning scroll 22 from rotating. As a result, the swivel scroll 22 makes a swivel motion without rotating with respect to the fixed scroll 21.
  • One end side of the drive shaft 40 is pivotally supported by the bearing 61, and the other end side is pivotally supported by the auxiliary bearing 70.
  • An eccentric shaft 41 eccentric with respect to the axis of the drive shaft 40 is provided at the upper end of the drive shaft 40.
  • the eccentric shaft 41 is slidably inserted into the boss 24 via the swing bush 41a and the swivel bearing 41b.
  • the boss 24 is swiveled by the eccentric shaft 41.
  • An oil supply passage 42 through which lubricating oil passes is formed inside the drive shaft 40.
  • the oil supply passage 42 is a through hole formed in the axial direction of the drive shaft 40.
  • One end of the oil supply passage 42 is opened in the oil reservoir 15 as a suction port 42a provided at the lower end of the drive shaft 40.
  • a paddle 43 for pumping lubricating oil from the suction port 42a to the oil supply passage 42 is provided above the suction port 42a.
  • the oil supply passage 42 guides the lubricating oil stored in the oil reservoir 15 to the compression mechanism 20 and the bearing 61.
  • the drive shaft 40 is formed with a communication hole 44 that communicates with the oil supply passage 42.
  • the communication hole 44 functions as a degassing of the oil supply passage 42, and discharges the lubricating oil guided from the oil supply passage 42.
  • the drive shaft 40 is formed with a bearing communication hole 42b that supplies lubricating oil to the main bearing 60.
  • the bearing communication hole 42b communicates with the oil supply passage 42.
  • the auxiliary bearing 70 is provided below the low pressure space 17, preferably in the oil reservoir 15.
  • the auxiliary bearing 70 includes a boss portion 71 that is formed in a cylindrical shape and into which a drive shaft 40 is inserted, and an arm portion 72 that extends from the boss portion 71 in the outer peripheral direction and is fixed to the inner peripheral surface of the closed container 10. ..
  • a balance weight 90 is provided on the drive shaft 40.
  • the balance weight 90 is located below the compression mechanism unit 20 and above the electric motor unit 30.
  • the compression mechanism unit 20, the electric motor unit 30, the main bearing 60, the sub bearing 70, and the balance weight 90 are arranged in the low pressure space 17.
  • the electric motor unit 30 and the balance weight 90 are arranged between the main bearing 60 and the auxiliary bearing 70.
  • the fixed scroll 21 and the swivel scroll 22 are arranged between the partition plate 50 and the main bearing 60.
  • the partition plate 50 and the main bearing 60 are fixed to the closed container 10.
  • At least one provided with an elastic body is at least a part between the partition plate 50 and the main bearing 60, and more specifically, the partition plate 50 and swivel. It is provided so as to be movable in the axial direction between the scroll 22 or between the fixed scroll 21 and the main bearing 60.
  • a straightening vane 100 is provided between the refrigerant suction pipe 18 and the suction portion 28 of the compression mechanism portion 20.
  • the straightening vane 100 is arranged at a position facing the suction port of the refrigerant suction pipe 18.
  • an upper closed portion 100a is formed above the refrigerant suction pipe 18 side of the rectifying plate 100, and the refrigerant suction pipe 18 of the rectifying plate 100 is formed.
  • a lower opening 100b is formed below the side.
  • the drive shaft 40 rotates together with the rotor 32 by driving the electric motor unit 30.
  • the eccentric shaft 41 and the old dam ring 27 cause the swivel scroll 22 to swivel around the central axis of the drive shaft 40 without rotating. As a result, the volume of the compression chamber 23 is reduced, and the refrigerant in the compression chamber 23 is compressed.
  • the refrigerant is introduced from the refrigerant suction pipe 18 into the low pressure space 17. Then, the refrigerant introduced into the low-pressure space 17 collides with the rectifying plate 100 and the upper closing portion 100a of the rectifying plate 100, and is rectified in the direction of the electric motor portion 30. Then, the refrigerant rectified in the direction of the electric motor unit 30 is temporarily released into the low-pressure space 17, and the refrigerant in a turbulent flow state due to the drive of the electric motor unit 30 is sucked into the compression chamber 23 and compressed in the compression chamber 23. The refrigerant is discharged from the refrigerant discharge pipe 19 via the high-pressure space 16.
  • the lubricating oil in the oil reservoir 15 is pumped into the oil supply passage 42 by the paddle 43.
  • the lubricating oil pumped up into the oil supply passage 42 flows out from the communication hole 44, is supplied to the main bearing 60 from the bearing communication hole 42b, and is supplied into the boss 24 from the upper end opening of the drive shaft 40.
  • the lubricating oil supplied into the boss 24 is supplied to the sliding surface of the compression mechanism portion 20.
  • the lubricating oil flowing out of the communication hole 44 is mainly discharged into the low pressure space 17 through the gap between the balance weight 90 and the rotor 32.
  • FIG. 2 is an enlarged cross-sectional view of a main part of the compressor.
  • the balance weight 90 is formed in an arc shape in a plan view, and is fixed to the drive shaft 40 by the connecting portion 91.
  • the drive shaft 40 is formed with an enlarged diameter portion 40a, the rotor 32 is positioned by the lower end of the enlarged diameter portion 40a, and the balance weight 90 is positioned by the upper end of the enlarged diameter portion 40a.
  • the rotor 32 has a protrusion 32b at the end of the iron core portion 32a.
  • the communication hole 44 is formed in the enlarged diameter portion 40a. Therefore, the communication hole 44 is located below the balance weight 90 and above the iron core portion 32a of the rotor 32. Further, the communication hole 44 is located on the inner circumference of the protrusion 32b of the rotor 32.
  • the balance weight 90 projects the lower end surface 90d of the balance weight 90 below the lower end 91d of the connecting portion 91 of the balance weight 90. Further, the balance weight 90 projects the upper end surface 90u of the balance weight 90 upward from the upper end 91u of the connecting portion 91 of the balance weight 90. The upper end 91u of the connecting portion 91 of the balance weight 90 is positioned above the lower end surface 61d of the main bearing 60.
  • the lower end surface 90d of the balance weight 90 is projected downward from the lower end 91d of the connecting portion 91 of the balance weight 90, so that the lower end surface 90d of the balance weight 90 is used as the rotor 32 of the electric motor unit 30. Since they can be brought close to each other, the lubricating oil discharged from the communication hole 44 can be reduced from being mixed with the refrigerant existing in the low pressure space 17, and the amount of oil discharged from the closed container 10 can be reduced.
  • the upper end surface 90u of the balance weight 90 is positioned above the upper end 91u of the connecting portion 91 of the balance weight 90 and above the lower end surface 61d of the main bearing 60, whereby the main bearing 60 It is possible to reduce the amount of lubricating oil dripping from the surface being mixed with the refrigerant existing in the low pressure space 17, and to reduce the amount of oil discharged from the closed container 10.
  • the gap dimension S between the lower end surface 90d of the balance weight 90 and the rotor 32 is smaller than the diameter D of the communication hole 44.
  • the balance weight 90 according to this embodiment is used to set the gap size S.
  • the oil discharge amount was changed to 2.7 mm, the oil discharge amount could be reduced to 26%, and when the gap size S was changed to 1 mm, the oil discharge amount could be reduced to 22%.
  • the amount of oil discharged can be significantly reduced by setting the gap dimension S to 20% or more and 60% or less of the diameter D of the communication hole 44.
  • the gap size S is preferably 1 mm or more and 2.7 mm or less.
  • the refrigerant in the low pressure space 17 is compressed by the compression mechanism unit 20, the refrigerant is discharged from the communication hole 44. Since the lubricating oil mixed in the refrigerant in the low pressure space 17 is mixed with the refrigerant in the low pressure space 17, the lubricating oil mixed in the refrigerant in the low pressure space 17 is likely to be discharged together with the high pressure refrigerant discharged from the compression mechanism unit 20, but according to this embodiment. For example, since it is possible to reduce the mixing of the refrigerant in the low pressure space 17, the amount of oil discharged from the closed container 10 can be reduced.
  • the present invention is particularly suitable for low-pressure scroll compressors.
  • Airtight container 11 Body shell 12 Lower shell 13 Upper shell 14 Inner bottom 15 Oil reservoir 16 High pressure space 17 Low pressure space 18 Refrigerant suction pipe 19 Refrigerant discharge pipe 20 Compression mechanism 21 Fixed scroll 21a End plate 21b Wrap 22 Swivel scroll 22a End plate 22b Wrap 23 Compression chamber 24 Boss 25 Discharge hole 26 Discharge valve 27 Rotation suppression member (old dam ring) 28 Suction part 30 Electric motor part 31 Stator 32 Rotor 32a Iron core part 32b Protrusion part 40 Drive shaft 40a Diameter expansion part 41 Eccentric shaft 41a Swing bush 41b Swing bearing 42 Oil supply passage 42a Suction port 42b Bearing oil supply hole 43 Paddle 44 Plate 60 Main bearing 61 Bearing 61d Lower end surface 70 Sub-bearing 71 Boss part 72 Arm part 90 Balance weight 90d Lower end surface 90u Upper end surface 91 Connecting part 91d Lower end 91u Upper end 100 Straightening plate 100a Upper closing part 100b Lower opening D Diameter S Gap Size

Abstract

La présente invention concerne un compresseur dans lequel : un poids d'équilibrage (90) est disposé au-dessus d'une partie moteur électrique (30) et au-dessous d'une partie mécanisme de compresseur (20) ; le poids d'équilibrage (90) est fixé à un arbre d'entraînement (40) au moyen d'une partie de liaison (91) ; une partie réservoir d'huile (15) est formée dans une partie inférieure interne (14) d'un contenant hermétiquement scellé (10) ; un passage d'alimentation en huile (42) pour guider l'huile de lubrification stockée dans la partie réservoir d'huile (15) vers la partie mécanisme de compresseur (20) et vers un palier (61), et un trou de communication (44) qui communique avec le passage d'alimentation en huile (42) sont formés dans l'arbre d'entraînement (40) ; le trou de communication (44) est positionné au-dessous du poids d'équilibrage (90) ; l'huile de lubrification guidée à partir du passage d'alimentation en huile (42) est évacuée du trou de communication (44) ; et en amenant une surface d'extrémité inférieure (90d) du poids d'équilibrage (90) à faire saillie au-dessous d'une extrémité inférieure (91d) de la partie de liaison (91) du poids d'équilibrage (90), de manière à s'approcher de la partie moteur électrique (30), la contamination d'un fluide frigorigène par l'huile de lubrification évacuée par le trou de communication (44) peut être réduite.
PCT/JP2020/028707 2019-07-29 2020-07-27 Compresseur WO2021020346A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2019-138449 2019-07-29
JP2019138449A JP7369934B2 (ja) 2019-07-29 2019-07-29 圧縮機

Publications (1)

Publication Number Publication Date
WO2021020346A1 true WO2021020346A1 (fr) 2021-02-04

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Application Number Title Priority Date Filing Date
PCT/JP2020/028707 WO2021020346A1 (fr) 2019-07-29 2020-07-27 Compresseur

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JP (1) JP7369934B2 (fr)
WO (1) WO2021020346A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05157079A (ja) * 1991-06-10 1993-06-22 Carrier Corp 駆動軸の製造方法
US20080175738A1 (en) * 2007-01-19 2008-07-24 Jung Chul-Su Compressor and oil blocking device therefor
US20130251543A1 (en) * 2012-03-23 2013-09-26 Bitzer Kuehlmaschinenbau Gmbh Compressor with Oil Return Passage Formed Between Motor and Shell

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110998094B (zh) 2017-07-27 2022-03-25 松下知识产权经营株式会社 涡旋式压缩机

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05157079A (ja) * 1991-06-10 1993-06-22 Carrier Corp 駆動軸の製造方法
US20080175738A1 (en) * 2007-01-19 2008-07-24 Jung Chul-Su Compressor and oil blocking device therefor
US20130251543A1 (en) * 2012-03-23 2013-09-26 Bitzer Kuehlmaschinenbau Gmbh Compressor with Oil Return Passage Formed Between Motor and Shell

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JP7369934B2 (ja) 2023-10-27
JP2021021363A (ja) 2021-02-18

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