WO2017002967A1 - Machine à fluide du type à spirale - Google Patents

Machine à fluide du type à spirale Download PDF

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Publication number
WO2017002967A1
WO2017002967A1 PCT/JP2016/069690 JP2016069690W WO2017002967A1 WO 2017002967 A1 WO2017002967 A1 WO 2017002967A1 JP 2016069690 W JP2016069690 W JP 2016069690W WO 2017002967 A1 WO2017002967 A1 WO 2017002967A1
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WO
WIPO (PCT)
Prior art keywords
scroll
movable
wrap
step height
base surface
Prior art date
Application number
PCT/JP2016/069690
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English (en)
Japanese (ja)
Inventor
公 塚本
尾坂　昌彦
真人 権守
Original Assignee
サンデン・エンバイロメントプロダクツ株式会社
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 サンデン・エンバイロメントプロダクツ株式会社 filed Critical サンデン・エンバイロメントプロダクツ株式会社
Publication of WO2017002967A1 publication Critical patent/WO2017002967A1/fr

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
    • F01C1/00—Rotary-piston machines or engines
    • F01C1/02—Rotary-piston machines or engines 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
    • 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

Definitions

  • the present invention relates to a scroll type fluid machine, and more particularly to a scroll type fluid machine suitable as a hermetic scroll compressor used in a heat pump type water heater using a carbon dioxide refrigerant.
  • a hermetic scroll compressor which is a scroll type fluid machine of this type, includes a scroll unit that performs a series of processes of refrigerant suction, compression, and discharge by a revolving orbit of a movable scroll relative to a fixed scroll in a housing.
  • spiral wraps are erected on the base surfaces of the movable and fixed scroll substrates, and by engaging the movable and fixed scrolls, the movable wrap and the fixed wrap cooperate to form a compression chamber.
  • the series of processes is performed by reducing the volume while the compression chamber moves to the central portion in the radial direction of the scroll unit.
  • Patent Document 1 when the operation of the scroll unit is stopped, a gap between the wrap tip surface of the movable scroll and the base surface of the fixed scroll when the movable and fixed scrolls are engaged with each other, and the base surface of the movable scroll are fixed.
  • a scroll type fluid machine in which a difference from a gap between a scroll wrap front end surface is set in accordance with a difference in coefficient of thermal expansion between a movable and fixed scroll.
  • this fluid machine by setting the difference between the respective gaps, when the operation of the scroll unit is stopped, the wrap tip surface between the movable and fixed scrolls and the base surface opposed thereto are brought into non-contact, and the movable and fixed scroll substrates are arranged. Since the compressor can be operated while the base surfaces (reference surfaces) on the outer peripheral side of the movable side and the stationary side wrap are stably in contact with each other, internal leakage of the refrigerant gas in the compressor can be suppressed.
  • the difference between the gaps is set to be larger than 3 ⁇ m, the carbon dioxide refrigerant gas is likely to leak from the compression chamber, and the compression efficiency during the operation of the scroll unit may be significantly impaired.
  • the present invention has been made in view of such a problem, and while reducing the production cost, suppresses refrigerant leakage from the compression chamber of the refrigerant during operation of the scroll unit, and friction loss such as seizure and galling in the scroll unit.
  • An object of the present invention is to provide an inexpensive and high-performance scroll type fluid machine that can reduce the above.
  • a scroll type fluid machine includes a fixed scroll and a movable scroll each provided with a spiral wrap in pairs on the base surface of a substrate.
  • a scroll type fluid machine in which a compression chamber for working fluid is formed between the laps by revolving orbiting movement, and the compression chamber moves while decreasing its volume from the outermost peripheral end portion to the innermost peripheral end portion.
  • the movable scroll has a plurality of front end step portions arranged stepwise at a step height equal to the front end surface of the wrap from the outermost peripheral end portion to the innermost peripheral end portion of the wrap of the movable scroll, And a plurality of base surface stepped portions arranged stepwise at a step height equal to the base surface of the substrate of the movable scroll.
  • the working fluid is a carbon dioxide refrigerant
  • the step heights of the tip step portion and the base surface step portion are less than 3 ⁇ m.
  • the step height of the tip step portion is equal to the step height of the base surface step portion.
  • the total step height by the tip step portion of the wrap tip surface is larger than the total step height by the base step portion of the base surface.
  • the movable scroll is made of any one of an aluminum alloy, a magnesium alloy, and cast iron.
  • a plurality of tip step portions are arranged at a step height equal to the wrap tip surface from the outermost peripheral end portion to the innermost peripheral end portion, and the base step portion also extends from the innermost peripheral end portion.
  • a plurality of steps are arranged with a step height equal to the base surface. Therefore, since the step height and the step height can be processed with high accuracy and efficiency compared to the case where the step height and the step height are step heights different from each other, the movable scroll, As a result, it is possible to provide an inexpensive and high-performance scroll compressor that can reduce friction loss such as seizure and galling in the scroll unit 2 while reducing the production cost of the scroll unit.
  • FIG. 3 is a diagram in which a spiral cross section of the substrate along the two-dot chain line B in FIG. 2 is horizontally developed.
  • FIG. 1 is a longitudinal sectional view of a hermetic scroll compressor 1 as an example of a scroll fluid machine according to the present embodiment.
  • the scroll unit 2 of the compressor 1 is accommodated in a hermetic container 4 composed of shells of top, center, and bottom, and is driven by an electric motor 8 through a rotating shaft 6.
  • the compressor 1 is incorporated in a refrigeration circuit such as a refrigeration air conditioner or a heat pump water heater, and the refrigeration circuit includes a path through which a carbon dioxide (CO2) refrigerant (hereinafter referred to as a refrigerant) that is an example of a working fluid circulates.
  • CO2 carbon dioxide
  • the compressor 1 sucks the refrigerant from the path, compresses it, and discharges it toward the path.
  • the scroll unit 2 performs a series of processes of refrigerant suction, compression and discharge.
  • the scroll unit 2 includes a movable scroll 10 and a fixed scroll 12.
  • the movable scroll 10 is made of an aluminum alloy and includes a substrate 14.
  • a base surface 16 that forms a sliding surface for the fixed scroll 12 on the substrate 14 has a spiral movable wrap 20 extending toward the substrate 18 of the fixed scroll 12. Is erected.
  • a spiral fixed wrap 24 extending toward the substrate 14 of the movable scroll 10 is erected on a base surface 22 that forms a sliding surface with respect to the movable scroll 10 in the substrate 18 of the fixed scroll 12.
  • the movable and fixed wraps 20 and 24 cooperate with each other facing and meshing with each other, so that the refrigerant is sucked from the refrigerant suction port 26 connected to the radially outer peripheral portion of the substrate 18 of the fixed scroll 12.
  • a compression chamber 28 is formed. As the movable scroll 10 revolves around the fixed scroll 12, the compression chamber 28 moves from the outermost peripheral end portion of the movable and fixed wraps 20, 24 toward the innermost peripheral end portion, and its volume is reduced. The refrigerant in the compression chamber 28 is set to a high pressure.
  • a boss 32 is formed on the back surface 30 opposite to the base surface 16 of the substrate 14 of the orbiting scroll 10, and the boss 32 is on the upper end side of the rotary shaft 6 via a bearing.
  • the movable scroll 10 is supported by an eccentric shaft 34 formed integrally therewith, and the rotation of the movable scroll 10 is prevented by a rotation prevention mechanism 36 disposed on the back surface 30 side.
  • the fixed scroll 12 is supported and fixed to a frame 38 fixed to the inside of the hermetic container 4, and a discharge hole 40 that can communicate with the compression chamber 28 is formed at the radial center of the fixed scroll 12. Yes.
  • the movable scroll 10 revolves without rotating, so that the refrigerant sucked into the scroll unit 2 through the suction port 26 is directed toward the radial center of the scroll unit 2.
  • the refrigerant discharged from the discharge hole 40 circulates in the closed container 4 and then discharged into the discharge chamber 42 formed in the top shell of the closed container 4. Then, it is sent out of the compressor 1 through a discharge port 44 communicated with the discharge chamber 42.
  • a step is provided on the wrap tip surface 52 from the outermost peripheral end 50 to the innermost peripheral end 48 of the movable wrap 20.
  • a plurality of tip step portions 54 are arranged in a shape.
  • On the base surface 16 of the substrate 14 of the movable scroll 10, a plurality of base surface step portions 56 are arranged stepwise.
  • the suction refrigerant flows from the suction port 26 between the back surface 30 of the movable scroll 10 and the frame 38, and a refrigerant back pressure chamber 58 is formed.
  • the back pressure chamber 58 is partitioned into a central portion on the eccentric shaft 34 side and an outer peripheral portion on the rotation prevention mechanism 36 side by a seal ring 60 fixed to the frame 38.
  • a high pressure chamber 58a in which the discharge pressure of the refrigerant acts is formed at the center of the back pressure chamber 58 with the seal ring 60 as a boundary.
  • an intermediate pressure chamber 58b of the refrigerant that is slightly raised in pressure from the refrigerant sucked from the suction port 26 is formed on the outer peripheral portion of the back pressure chamber 58 with the seal ring 60 as a boundary. Since the movable scroll 10 is pressed toward the fixed scroll 12 by the pressure in the back pressure chamber 58, the magnitude of the pressing force is considered as a first factor. Further, since the movable scroll 10 is pressed from the high pressure chamber 58a toward the compression chamber 28 by the compressed refrigerant compressed along with the formation of the compression chamber 28, the magnitude of the compression force of the refrigerant in the compression chamber 28 is a second factor.
  • the movable and fixed scrolls 10 and 12 expand in the axial direction of the rotary shaft 6 with the temperature at which the scroll unit 2 is exposed during the operation of the compressor 1, the movable and fixed scrolls 10 and 12 are made of a material.
  • the linear expansion coefficient as a third factor.
  • the innermost peripheral end portion 48 of the movable wrap 20 has a higher temperature than the outermost peripheral end portion 50, a temperature difference between the innermost peripheral end portion 48 and the outermost peripheral end portion 50 is also taken into consideration.
  • the movable wrap 20 has a plurality of leading ends so as to make the stress that can be generated in the scroll unit 2 from the innermost peripheral end 48 to the outermost peripheral end 50 uniform.
  • the step portion 54 and the plurality of base surface step portions 56 are formed at unequal positions in the lapping direction shown in FIG.
  • step-difference part 56 are formed by cutting the lap
  • the base surface step portion 56 is formed to have a substantially semicircular boundary that protrudes toward the outermost peripheral end portion 50 in the circumferential direction of the movable wrap 20.
  • the width W and the height H of the movable wrap 20 have the same dimensions at each part of the movable wrap 20. Since the wrap tip surface 52 is gradually positioned at a lower position from the outermost peripheral end portion 50 side to the innermost peripheral end portion 48 in the movable scroll 10, the movable wrap 20 is entirely positioned at the innermost peripheral end.
  • the portion 48, that is, the radial central portion is formed in a concave shape.
  • FIG. 4 is a diagram in which the spiral cross section of the movable wrap 20 along the alternate long and short dash line A shown in FIG. 2 is developed horizontally.
  • the tip step portion 54 is located at the innermost end from the outermost peripheral end portion 50. It is arranged at a low position step by step so as to gradually decrease stepwise with a step height H1 equal to the wrap tip surface 52 over the peripheral end 48.
  • FIG. 5 is a diagram in which the spiral cross section of the substrate 14 along the two-dot chain line B shown in FIG. 2 is developed horizontally.
  • the step height is gradually lowered at a step height H2 equal to the base surface 16, and the step height H1 of the tip step portion 54 and the base surface are gradually lowered.
  • the step height H2 of the step portion 56 is set to a height of 1 ⁇ m.
  • the tip step portion 54 is arranged with the step height H1 equal to the wrap tip surface 52 from the outermost peripheral end portion 50 to the innermost peripheral end portion 48, and the base step portion 56 is also the innermost peripheral portion. It is arranged with a step height H2 equal to the base surface 16 over the end 48. Accordingly, the tip stepped portion 54 and the base stepped portion 56 can be processed with high accuracy and efficiency as compared with the case where the step height H1 and the step height H2 are stepped differently. Further, it is possible to provide an inexpensive and high-performance scroll compressor 1 that can reduce friction loss such as seizure and galling in the scroll unit 2 while reducing the production cost of the movable scroll 10 and consequently the scroll unit 2. .
  • the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.
  • the step height H1 of the tip step portion 54 and the step height H2 of the base step portion 56 are set to the same 1 ⁇ m, but the step height H1 and the step height H2 are different. good.
  • the movable scroll 10 is made of an aluminum alloy, but the material of the movable scroll 10 is not limited to this.
  • the movable scroll 10 may be formed of a magnesium alloy, and in this case, the linear expansion coefficient of the material is slightly larger and the Young's modulus is smaller than that of the aluminum alloy.
  • the step height H1 of the tip step portion 54 and the step height H2 of the base surface step portion 56 are set slightly larger than in the case of an aluminum alloy, for example, about 2 ⁇ m.
  • the material of the movable scroll 10 may be formed of cast iron.
  • the material has a smaller linear expansion coefficient and a higher Young's modulus than the aluminum alloy. For this reason, it is preferable to slightly reduce the number of the tip stepped portion 54 and the base surface stepped portion 56 as compared with the case of the aluminum alloy.
  • the step height H1 of the tip step portion 54 and the step height H2 of the base step portion 56 are both set to 1 ⁇ m, and the tip step portion 54 and the base step portion 56 are shown in FIG.
  • the number and position of the tip stepped portion 54 and the base surface stepped portion 56 are set based on the experimental results in consideration of the above three factors. And it is not limited to the position.
  • the step height H1 and the step height H2 are preferably small heights of less than 3 ⁇ m in order to suppress leakage of carbon dioxide refrigerant gas.
  • the scroll unit 2 is simultaneously slid while sliding the movable wrap 20 on the base surface 22 of the fixed scroll 12 with a certain level of surface pressure due to thermal expansion during operation of the scroll unit 2 using carbon dioxide refrigerant as the working fluid.
  • the step height H1 and the step height H2 are set to be relatively small 1 ⁇ m, and the total step height by the tip step portion 54 of the lap tip surface 52 is based on the total step height. It is more preferable that the height is larger than the total step height due to the base surface step portion 56 of the surface 16.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Rotary Pumps (AREA)

Abstract

La présente invention concerne une machine à fluide du type à volute (1) comprenant une spirale mobile (10) ayant, depuis une section (50) d'extrémité circonférentielle la plus à l'extérieur jusqu'à une section (48) d'extrémité circonférentielle la plus à l'intérieure d'un tour (20) de la spirale mobile (10), plusieurs sections (54) étagées d'extrémité avant agencées de façon à être progressivement décroissantes selon une marche d'égale hauteur (H1) sur une surface (52) d'extrémité avant de tour, et plusieurs sections (56) étagées de surface de base agencées de façon à être progressivement décroissantes selon une marche d'égale hauteur (H2) sur une surface de base (16) d'une plaque de base (14) de la spirale mobile (10).
PCT/JP2016/069690 2015-07-01 2016-07-01 Machine à fluide du type à spirale WO2017002967A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2015132674A JP2017015000A (ja) 2015-07-01 2015-07-01 スクロール型流体機械
JP2015-132674 2015-07-01

Publications (1)

Publication Number Publication Date
WO2017002967A1 true WO2017002967A1 (fr) 2017-01-05

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PCT/JP2016/069690 WO2017002967A1 (fr) 2015-07-01 2016-07-01 Machine à fluide du type à spirale

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WO (1) WO2017002967A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP7221752B2 (ja) 2019-03-20 2023-02-14 サンデン株式会社 スクロール圧縮機
JP2021076070A (ja) * 2019-11-11 2021-05-20 パナソニックＩｐマネジメント株式会社 スクロール圧縮機

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0886287A (ja) * 1994-09-16 1996-04-02 Hitachi Ltd スクロール流体機械
JP2002303281A (ja) * 2001-02-02 2002-10-18 Mitsubishi Heavy Ind Ltd スクロール圧縮機
JP2005009332A (ja) * 2003-06-17 2005-01-13 Matsushita Electric Ind Co Ltd スクロール圧縮機
JP2007046582A (ja) * 2005-08-12 2007-02-22 Sanden Corp スクロール型流体機械、及び該流体機械を用いた冷凍サイクル
WO2008081906A1 (fr) * 2006-12-28 2008-07-10 Mitsubishi Heavy Industries, Ltd. Compresseur à spirale
JP2014009593A (ja) * 2012-06-27 2014-01-20 Mitsubishi Heavy Ind Ltd スクロール圧縮機

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0886287A (ja) * 1994-09-16 1996-04-02 Hitachi Ltd スクロール流体機械
JP2002303281A (ja) * 2001-02-02 2002-10-18 Mitsubishi Heavy Ind Ltd スクロール圧縮機
JP2005009332A (ja) * 2003-06-17 2005-01-13 Matsushita Electric Ind Co Ltd スクロール圧縮機
JP2007046582A (ja) * 2005-08-12 2007-02-22 Sanden Corp スクロール型流体機械、及び該流体機械を用いた冷凍サイクル
WO2008081906A1 (fr) * 2006-12-28 2008-07-10 Mitsubishi Heavy Industries, Ltd. Compresseur à spirale
JP2014009593A (ja) * 2012-06-27 2014-01-20 Mitsubishi Heavy Ind Ltd スクロール圧縮機

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