WO2018012268A1 - Compresseur à spirale étagé et son procédé de conception - Google Patents

Compresseur à spirale étagé et son procédé de conception Download PDF

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Publication number
WO2018012268A1
WO2018012268A1 PCT/JP2017/023425 JP2017023425W WO2018012268A1 WO 2018012268 A1 WO2018012268 A1 WO 2018012268A1 JP 2017023425 W JP2017023425 W JP 2017023425W WO 2018012268 A1 WO2018012268 A1 WO 2018012268A1
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WO
WIPO (PCT)
Prior art keywords
spiral
scroll
wall body
wrap wall
spiral wrap
Prior art date
Application number
PCT/JP2017/023425
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English (en)
Japanese (ja)
Inventor
創 佐藤
善彰 宮本
央幸 木全
Original Assignee
三菱重工サーマルシステムズ株式会社
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 三菱重工サーマルシステムズ株式会社 filed Critical 三菱重工サーマルシステムズ株式会社
Priority to EP17827398.3A priority Critical patent/EP3441614A4/fr
Priority to CN201780026502.3A priority patent/CN109072912B/zh
Publication of WO2018012268A1 publication Critical patent/WO2018012268A1/fr

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    • 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
    • F04C18/0246—Details concerning the involute wraps or their base, e.g. geometry
    • F04C18/0253—Details concerning the base
    • 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
    • F04C18/0246—Details concerning the involute wraps or their base, e.g. geometry
    • 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
    • F04C18/0246—Details concerning the involute wraps or their base, e.g. geometry
    • F04C18/0269—Details concerning the involute wraps
    • 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
    • F04C18/0246—Details concerning the involute wraps or their base, e.g. geometry
    • F04C18/0269—Details concerning the involute wraps
    • F04C18/0276—Different wall heights
    • 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
    • F04C28/00—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids
    • F04C28/28—Safety arrangements; Monitoring

Definitions

  • the present invention relates to a stepped scroll compressor and a method for designing the same, in which a spiral wrap wall is prevented from being damaged.
  • a scroll compressor that compresses refrigerant, air, or the like, as disclosed in Patent Document 1 and the like, the tooth tip surface and the tooth bottom surface of the spiral wrap wall body standing on the end plate of the fixed scroll and the orbiting scroll are arranged.
  • a so-called stepped scroll compressor in which step portions are provided at arbitrary positions along the spiral direction, and the wrap height on the outer peripheral side of the step portions is higher than the wrap height on the inner peripheral side.
  • Such a stepped scroll compressor can compress the fluid to be compressed three-dimensionally in both the circumferential direction and the height direction of the spiral wrap wall, so that the spiral wrap is smaller than a scroll compressor without a step.
  • the compression ratio can be increased without increasing the number of turns of the wall. Therefore, the design volume ratio can be increased without increasing the outer diameter of the scroll compressor, and the scroll compressor can be reduced in size and weight.
  • Patent Document 1 in such a stepped scroll compressor, a thin wall portion is formed on the side surface of the spiral wrap wall body in the vicinity of the stepped portion formed on the bottom surface of the end plate of the fixed scroll and the orbiting scroll.
  • a thin wall portion is formed on the side surface of the spiral wrap wall body in the vicinity of the stepped portion formed on the bottom surface of the end plate of the fixed scroll and the orbiting scroll.
  • the wrap height of the spiral wrap wall decreases stepwise from the outer peripheral side toward the inner peripheral side, but the height between the outermost peripheral section and the innermost peripheral section is low.
  • the compression ratio can be increased by increasing the difference.
  • the wrap height of the spiral wrap wall body tends to be higher than the wrap height of the spiral wrap wall body in the scroll compressor without a step.
  • the thin wall portion is formed on the side surface of the spiral wrap wall body in the vicinity of the step portion formed on the bottom surface of the scroll end plate in order to prevent noise.
  • the spiral wrap wall bodies come into contact with each other on the outer peripheral side of the region where the thin wall portion is formed, there is a risk that the spiral wrap wall body is damaged.
  • the present invention has been made to solve such problems, and prevents damage to the spiral wrap wall in the stepped scroll compressor, thereby improving durability and reliability, and minimizing compression leakage. It is an object of the present invention to provide a stepped scroll compressor and a design method thereof that can suppress the compression performance from being lowered.
  • a pair of compression chambers for compressing the fluid to be compressed is formed by combining them, and the height of the tooth bottom surface of the one side surface of at least one of the fixed scroll and the orbiting scroll is the spiral wrap wall.
  • a tooth bottom step portion that increases from the outer peripheral side to the inner peripheral side in the spiral direction of the body is provided, and the spiral wrap wall body of the other scroll corresponding to the tooth bottom step portion has a tooth tip surface thereof.
  • a tooth tip step portion whose height decreases from the outer peripheral side to the inner peripheral side in the spiral direction is provided, and at least one of the fixed scroll and the orbiting scroll Only the abdominal surface of the spiral wrap wall body in the range adjacent to the tooth bottom surface on the outer peripheral side in the spiral direction with respect to the step difference portion of the tooth root and overlapping at least the opposed spiral wrap wall body is more than the original side profile. It is the one that has receded inward.
  • the fixed scroll and the orbiting scroll in which the spiral wrap wall body is erected on one side surface of each end plate are arranged in the spiral wrap wall.
  • a pair of compression chambers for compressing a fluid to be compressed is formed by meshing the bodies, and the height of the tooth bottom surface of the one side surface of at least one of the fixed scroll and the orbiting scroll is the spiral.
  • a tooth bottom step portion that increases from the outer peripheral side to the inner peripheral side of the spiral wrap wall body is provided, and the spiral wrap wall body of the other scroll corresponding to the tooth bottom step portion has its tooth
  • the spiral wrap wall has the highest wrap height, that is, the spiral adjacent to the tooth bottom surface in the spiral direction outer side than the tooth bottom step portion. Only the abdominal surface of the wrapping wall recedes inward from the original side profile. For this reason, the spiral wrap walls of the fixed scroll and the orbiting scroll are not in contact with each other in the section on the outermost circumferential side in the spiral direction where the wrap height is the highest and the risk of breakage is large. Damage due to contact can be prevented in advance.
  • the amount by which the abdominal surface of the spiral wrap wall is retracted inward is such that it does not adversely affect the compression of the fluid to be compressed, for example, about 100 ⁇ m or less. For this reason, while preventing the deterioration of compression performance by minimizing the compression leakage of the stepped scroll compressor, the spiral wrap wall is prevented from being damaged, and the durability and reliability of the stepped scroll compressor is increased. be able to.
  • the teeth except for the non-involute section in the spiral wrap wall body It is good also considering the spiral length of the area of the spiral direction inner peripheral side rather than a front step part as less than 360 degrees.
  • the stepped scroll compressor according to the first aspect of the present invention, and the first aspect of the present invention it is preferable to apply the stepped scroll compressor design method according to the second aspect.
  • the abdominal surface and back surface of a spiral wrap wall body are kept with the original side surface profile, without retreating inside.
  • the swirl length of the section on the inner circumferential side of the swirl direction from the tooth tip step portion is less than 360 °, the swirl length when the section between the tooth tip step portion and the tooth bottom step portion is combined. Is over 360 °.
  • the spiral wrap wall bodies are in contact at two points in either the section on the inner peripheral side of the spiral direction or the section continuing on the outer peripheral side of the spiral direction.
  • the orbit of the orbiting scroll with respect to the fixed scroll is determined. Therefore, even if the inner and outer side surfaces of the spiral wrap wall are retracted inward in the spiral outer peripheral section of the tooth bottom step, that is, in the section where the wrap height of the spiral wrap wall is the highest, this retract is performed. Therefore, the orbiting scroll does not move in the surface direction of the end plate, and damage due to contact between the spiral wrap wall bodies can be prevented.
  • a pair of compression chambers for compressing the fluid to be compressed is formed by combining them, and the height of the tooth bottom surface of the one side surface of at least one of the fixed scroll and the orbiting scroll is the spiral wrap wall.
  • a tooth bottom step portion that increases from the outer peripheral side to the inner peripheral side in the spiral direction of the body is provided, and the spiral wrap wall body of the other scroll corresponding to the tooth bottom step portion has a tooth tip surface thereof.
  • a tooth tip step portion whose height decreases from the outer peripheral side to the inner peripheral side in the spiral direction is provided, and at least one of the fixed scroll and the orbiting scroll Ventral surface and back surface of the spiral wrap wall adjacent to the bottom land of the spiral direction outer peripheral side of the tooth bottom step portion, in which is recessed inward from its original side surface profile.
  • a method for designing a stepped scroll compressor in which a fixed scroll and an orbiting scroll in which a spiral wrap wall body is erected on one side surface of each end plate are connected to each other.
  • a pair of compression chambers for compressing a fluid to be compressed is formed by meshing the bodies, and the height of the tooth bottom surface of the one side surface of at least one of the fixed scroll and the orbiting scroll is the spiral.
  • a tooth bottom step portion that increases from the outer peripheral side to the inner peripheral side of the spiral wrap wall body is provided, and the spiral wrap wall body of the other scroll corresponding to the tooth bottom step portion has its tooth
  • a method for designing a stepped scroll compressor provided with a toothed tip step portion in which the height of the tip surface decreases from the outer peripheral side to the inner peripheral side in the spiral direction, the fixed scroll and the swivel For at least one of the scrolls, the abdominal surface and the back surface of the spiral wrap wall adjacent to the tooth bottom surface in the spiral direction outer side than the tooth bottom step portion are retreated inward from the original side profile. .
  • a section where the wrap height of the spiral wrap wall body is high i.e., adjacent to the tooth bottom surface in the spiral direction outer side than the tooth bottom step portion, and At least in the range where it overlaps the opposing spiral wrap wall, the abdominal surface and back surface of the spiral wrap wall recede inward from its original side profile.
  • the amount by which the abdominal surface and back surface of the spiral wrap wall are retracted inward is such that it does not adversely affect the compression of the fluid to be compressed, for example, about 100 ⁇ m or less. For this reason, while preventing the deterioration of compression performance by minimizing the compression leakage of the stepped scroll compressor, the spiral wrap wall is prevented from being damaged, and the durability and reliability of the stepped scroll compressor is increased. be able to.
  • the teeth except for the non-involute section in the spiral wrap wall body may be 360 ° or more.
  • the stepped scroll compressor according to the third aspect of the present invention, and the first aspect of the present invention it is preferable to apply the stepped scroll compressor design method according to the fourth aspect.
  • step-difference part except a non-involute area is 360 degrees or more,
  • the abdominal surface and back surface of a spiral wrap wall body Keeps its original side profile without retreating inward.
  • the spiral wrap wall members come into contact with each other at two points only in the section on the inner circumferential side of the spiral direction, thereby determining the orbit of the orbiting scroll with respect to the fixed scroll.
  • the amount by which the abdominal surface and back surface of the spiral wrap wall are retracted inward is such that it does not adversely affect the compression of the fluid to be compressed, for example, about 100 ⁇ m or less. For this reason, while preventing the deterioration of compression performance by minimizing the compression leakage of the stepped scroll compressor, the spiral wrap wall is prevented from being damaged, and the durability and reliability of the stepped scroll compressor is increased. be able to.
  • the range is ⁇ / ⁇ ⁇ 0.01.
  • the maximum value of the retreat amount is determined in this way, it is possible to achieve both prevention of the spiral wrap wall breakage and suppression of performance degradation due to compression leakage in stepped scroll compressors of various sizes.
  • the retracted amount of the abdominal surface and the front and back surfaces of the spiral wrap wall body may be gradually decreased from the outer peripheral side toward the inner peripheral side in the spiral direction at the position of the stepped portion of the tooth bottom.
  • the retraction amount of the abdominal surface and the front and back surfaces of the spiral wrap wall body may be increased from the root side to the tip side of the spiral wrap wall body. This prevents the spiral wrap walls from contacting each other on the tip side without reducing the thickness dimension on the base side of the spiral wrap wall and impairing the strength. It can prevent body damage.
  • the spiral wrap wall body is prevented from being damaged in the section where the lap height is high, and the durability and reliability are improved. Leakage can be minimized and compression performance can be prevented from deteriorating.
  • FIG. 1 is a longitudinal sectional view of a stepped scroll compressor according to an embodiment of the present invention.
  • the stepped scroll compressor 1 is, for example, a hermetic electric scroll compressor for HFC (hydrofluorocarbon) refrigerant, but the present invention is not limited to this type of scroll compressor.
  • the stepped scroll compressor 1 is provided with a cylindrical bottomed steel plate sealed housing 2 that is long in the vertical direction.
  • a scroll compression mechanism 3 is installed in an upper part of the hermetic housing 2, and an electric motor 4 is installed in a lower part thereof.
  • the upper side of the partition member 30 provided at the upper part of the scroll compression mechanism 3 is a discharge chamber 5 into which high-pressure gas compressed by the scroll compression mechanism 3 is discharged, and a discharge pipe 6 is connected thereto.
  • a lower side than the partition member 30 and the scroll compression mechanism 3 is a suction chamber 7 into which low-pressure suction gas is sucked, and a suction pipe 8 is connected thereto.
  • an electric motor 4 composed of a stator 9 and a rotor 10 is installed in the hermetic housing 2 by press fitting or the like, and a crank connected to the rotor 10 of the electric motor 4
  • the shaft 11 extends in the vertical direction.
  • a lower end portion of the crankshaft 11 is supported by a lower bearing 12 provided in the hermetic housing 2, and an upper end portion of the crankshaft 11 is rotatably supported by a journal bearing portion 15B of the upper bearing member 15.
  • the scroll compression mechanism 3 is fixed in the sealed housing 2 via the upper bearing member 15.
  • the scroll compression mechanism 3 includes a fixed scroll 16 that is fixed on the upper bearing member 15, and a turning scroll 20 that is supported on the upper bearing member 15 so as to be capable of revolving with respect to the fixed scroll 16. ing.
  • the fixed scroll 16 includes a fixed end plate 17 (end plate) fixed in the hermetic housing 2 and a spiral fixed wrap wall body standing on one side surface thereof. 18 (spiral wrap wall), and a discharge port 19 is provided at the center of the fixed end plate 17.
  • the orbiting scroll 20 includes an orbiting end plate 21 (end plate) and a spiral orbiting wrap wall body 22 (spiral wrap wall body) erected on one side surface thereof. ), And a swivel boss portion 23 is integrally provided on the back side of the swivel end plate 21.
  • the orbiting scroll 20 has a back surface of the orbiting end plate 21 supported on the thrust bearing portion 15A of the upper bearing member 15 and is installed on the orbiting boss portion 23 with an eccentricity ⁇ at the upper end of the crankshaft 11.
  • the pin 11 ⁇ / b> A is connected via a drive bush 25 and a swing bearing 26 that constitute a known driven crank mechanism, so that the revolution around the fixed scroll 16 can be driven.
  • the eccentric amount ⁇ of the crank pin 11 ⁇ / b> A is the turning radius of the orbiting scroll 20 with respect to the fixed scroll 16.
  • the heights of the respective tooth bottom surfaces 17a and 21a are from the outer peripheral side to the inner peripheral side in the spiral direction of the respective wrap wall bodies 18 and 22.
  • a tooth bottom step BS is provided which is stepped up toward the top.
  • the heights of the tooth tip surfaces 18a and 22a of the other scrolls 16 and 20 on the wrap walls 18 and 22 are from the outer peripheral side to the inner peripheral side in the spiral direction.
  • a lower tooth tip step TS is provided.
  • the fixed wrap wall body 18 and the orbiting wrap wall body 22 are 180 degrees out of phase and meshed in a known manner, so that a pair of compression is provided between the wrap wall bodies 18 and 22.
  • a chamber 24 is formed.
  • the pair of compression chambers 24 are configured to move while the volume is reduced from the outer peripheral position to the center portion when the orbiting scroll 20 is revolving orbited, and to perform a compression action.
  • the compression chamber 24 is configured such that the height in the axial direction of the crankshaft 11 is higher than the height on the inner peripheral side on the outer peripheral side of each wrap wall 18, 22.
  • a scroll compression mechanism 3 capable of three-dimensional compression capable of compressing gas in both height directions is configured.
  • Tip seals 18b and 22b (see FIG. 5) for sealing between the tooth bottom surfaces 17a and 21a of the counterpart scroll are provided on the tooth tip surfaces 18a and 22a of the wrap wall bodies 18 and 22, respectively. , 22a are fitted in grooves.
  • Rotation prevention means 27 including an Oldham ring or the like for preventing the rotation of the orbiting scroll 20 is incorporated between the rear surface of the orbiting end plate 21 of the orbiting scroll 20 and the thrust bearing portion 15A of the upper bearing member 15.
  • the fixed end plate 17 of the fixed scroll 16 is provided with a discharge cover 28 on the back side thereof and a reed valve type discharge valve 29 for opening and closing the discharge port 19.
  • a low-pressure refrigerant gas (HFC refrigerant) is sucked into the hermetic housing 2 through the suction pipe 8, and this refrigerant gas Is sucked into the compression chamber 24 of the scroll compression mechanism 3 through the refrigerant flow path provided in the upper bearing member 15 and the like.
  • the refrigerant gas sucked into the compression chamber 24 is driven at a high temperature and high pressure while the orbiting scroll 20 is driven to revolve around the fixed scroll 16 and the compression chamber 24 is moved from the outer peripheral position to the center side while reducing its volume. Is compressed.
  • the compressed refrigerant gas opens the discharge valve 29 to flow into the discharge chamber 5 and is supplied from the discharge pipe 6 to the heat exchanger such as a condenser through an external pipe.
  • FIG. 6 is a development view of the wrap wall bodies 18 and 22 in the fixed scroll 16 and the orbiting scroll 20 showing the first embodiment of the present invention.
  • the angle numerical values displayed in FIG. 6 match the positions of the same numerical values in the fixed wrap wall body 18 and the swirl wrap wall body 22 shown in FIG.
  • the radially inner peripheral surface is referred to as an “abdominal surface” and the radially outer peripheral surface is referred to as a “rear surface”.
  • the abdominal surfaces of the wrap wall bodies 18 and 22 are, along the circumferential direction, a non-involute section from the start point SP to 0 °, a section A1 from 0 ° to 450 °, and a section A2 from 450 ° to 630 °. , And can be divided into three sections, the section A3 from the end point EP just before 630 ° to 900 °.
  • the wrap heights from the tooth bottom surfaces 17a and 21a to the tooth tip surfaces 18a and 22a are H1, H2 and H3, respectively, and the magnitude relationship is H1 ⁇ H2 ⁇ H3. It has become.
  • the back surfaces of the wrap walls 18 and 22 are, along the circumferential direction, a non-involute section from the start point SP to 0 °, a section B1 from 0 ° to 270 °, and a section B2 from 270 ° to 450 °.
  • a section B3 from 450 ° to 720 ° before point P1 and a section B4 from point P1 to 900 ° before this end point EP can be divided into four sections.
  • the abdominal surface of the opposing wrap wall body does not overlap in the section B4.
  • the lap heights from the tooth bottom surfaces 17a, 21a to the tooth tip surfaces 18a, 22a are H1, H2, H3, respectively, and the magnitude relationship is H1 ⁇ H2 ⁇ . H3.
  • the fixed wrap wall 18 and the swirl wrap wall 22 are excluded from the effective spiral length of the section on the inner peripheral side in the spiral direction from the tooth tip step portion TS, that is, the non-involute section from the start point SP to 0 °.
  • the spiral length of the section A1 on the abdominal surface and the section B1 + B2 on the back surface is 360 ° or more. That is, when the fixed wrap wall 18 and the swivel wrap wall 22 are combined, the abdominal surface section A1 and the back section B1 + B2 of both the wrap wall bodies 18 and 22 make one round in the spiral direction. It is supposed to overlap.
  • the surfaces of the abdominal surface side section A3 and the back side sections B2 and B3 adjacent to the tooth bottom surface 17a and 21a on the outer peripheral side in the spiral direction with respect to the tooth bottom stepped portion BS are It is slightly inwardly retracted from the original abdominal and back surface profiles to the extent that it does not adversely affect the compression of the refrigerant that is the compressed fluid.
  • the thickness of the wrap wall bodies 18 and 22 is made thinner than before.
  • the range in which the surface is retracted is indicated by symbol xxx
  • the range in which the surface is retracted is shaded.
  • the rear side section B4 may also be retracted inward, but the opposing spiral wrap wall bodies 18 and 22 do not overlap each other (there is no concern of contact), so the surface is not retracted. May be.
  • This reverse amount is set to be in the range of ⁇ / ⁇ ⁇ 0.01, where ⁇ is the maximum value and ⁇ is the turning radius of the orbiting scroll 20. Specific numerical values are, for example, 100 ⁇ m or less, preferably about 10 to 20 ⁇ m.
  • a method of retreating the surface it is conceivable to manufacture with a shape retreated from the beginning, or to post-process the lapped walls 18 and 22 that have not been retreated.
  • a post-processing method a mechanical method such as polishing or cutting, or a chemical method such as etching can be considered.
  • the fixed scroll 16 and the orbiting scroll 20 are configured as described above. According to this, in the section where the wrap height of the wrap wall bodies 18 and 22 is high, that is, the section A3 (abdominal surface side) and B2 and B3 (rear surface side) on the outer peripheral side in the spiral direction with respect to the tooth bottom stepped portion BS. In addition, since both surfaces of the wrap wall bodies 18 and 22 are retracted inward from the surface profile of the original abdominal surface, the wrap wall bodies 18 and 22 swirl with the fixed wrap wall body 18 in the section in the spiral direction outer peripheral side where the wrap heights H2 and H3 are high. There is no contact with the wrap wall 22. Therefore, damage due to contact between the wrap wall bodies 18 and 22 can be prevented in advance.
  • the spiral length in the section A1 (abdominal surface side) and B1, B2 (rear surface side) on the inner circumferential side of the tooth tip step portion TS is 360 ° or more.
  • the wrap wall 18 , 22 are kept in the original side profile without retreating inwardly on both the abdominal and back sides. For this reason, when the stepped scroll compressor 1 is operated, the lap wall bodies 18 and 22 are in contact with each other at two points only in the sections A1, B1, and B2 on the inner peripheral side in the spiral direction. Twenty turning trajectories are established.
  • the orbiting scroll 20 is moved by the amount of the retraction. It does not move in the surface direction of the end plate 21, and can be prevented from being damaged by contact between the wrap wall bodies 18 and 22.
  • the amount by which the abdomen and back surfaces of the wrap walls 18 and 22 are retracted inward is set to an extent that does not adversely affect the compression of the refrigerant, for example, about 100 ⁇ m or less, and therefore, the compression leakage of the stepped scroll compressor 1 is minimized. While preventing the compression performance from being reduced to the limit, the wrap wall bodies 18 and 22 can be prevented from being damaged, and the durability and reliability of the stepped scroll compressor 1 can be improved. In the sections A1 and B1 on the inner peripheral side in the spiral direction where the compression pressure is highest, the abdominal surface and the back surface of the wrap wall bodies 18 and 22 are not retracted, and no gap is generated between the wrap wall bodies 18 and 22. For this reason, it is possible to prevent the refrigerant from being compressed and leaked.
  • the receding amount of the abdominal surface and the rear surface of the wrap wall bodies 18 and 22 is the maximum value so that the maximum value is ⁇ and the turning radius of the orbiting scroll 20 is ⁇ , and is within the range of ⁇ / ⁇ ⁇ 0.01. ⁇ is set. For this reason, in the stepped scroll compressor of various sizes, it is possible to achieve both prevention of breakage of the wrap wall bodies 18 and 22 and suppression of performance deterioration due to compression leakage.
  • the receding of the abdominal surface and the back surface of the wrap wall bodies 18 and 22 is not necessarily performed uniformly over the entire height direction of the abdominal surface and the back surface, and is directed from the base side to the distal end side of the wrap wall bodies 18 and 22.
  • the retraction amount may be increased.
  • the vertical cross-sectional shape of the wrap wall bodies 18, 22 is tapered from the base side toward the tip side, or the lap wall bodies 18, 22 are vertically cut as shown in FIG. 8. It is conceivable that the surface shape is gradually reduced from the base side to the tip side.
  • wrap wall bodies 18 and 22 prevents the wrap wall bodies 18 and 22 from contacting each other on the tip side without reducing the thickness dimension on the base side of the wrap wall bodies 18 and 22 and impairing the strength. Damage to the bodies 18 and 22 can be prevented. If the opposing fixed wrap wall 18 and the swirl wrap wall 22 are both the same taper cross-sectional shape or stepped cross-sectional shape, the cross-sectional shapes of both wrap wall bodies 18 and 22 are equal and opposite to each other. Therefore, it is possible to prevent refrigerant leakage by minimizing the meshing interval between the wrap wall bodies 18 and 22.
  • FIG. 9 is an enlarged longitudinal sectional view of the fixed scroll 16 according to the second embodiment of the present invention
  • FIG. 10 is a bottom view of the fixed scroll 16.
  • FIG. 11 is a diagram in which a fixed scroll and a turning scroll are combined.
  • FIG. 12 is an expanded view of the wrap wall bodies 18 and 22 in the fixed scroll and the orbiting scroll showing the second embodiment of the present invention.
  • the fixed scroll 16 and the orbiting scroll 20 shown here are different only in the number of turns (angle numerical value) of the wrap wall bodies 18 and 22 from those of the first embodiment.
  • the basic structure is the same. Accordingly, parts having the same configuration are denoted by the same reference numerals and description thereof is omitted.
  • the abdominal surfaces of the wrap walls 18 and 22 are, along the circumferential direction, a non-involute section from the start point SP to 0 °, a section A1 from 0 ° to the tooth tip step portion TS (point P1), and a tooth tip step. It can be divided into three sections, a section A2 from the part TS (P1) to the root step part BS (point P2) and a section A3 from the root step part BS (P2) to the end point EP.
  • the wrap heights from the tooth bottom surfaces 17a and 21a to the tooth tip surfaces 18a and 22a are H1, H2 and H3, respectively, and the magnitude relationship is H1 ⁇ H2 ⁇ H3. It has become.
  • the back surfaces of the wrap wall bodies 18 and 22 are, along the circumferential direction, a non-involute section from the start point SP to 0 °, a section B1 from 0 ° to the root step portion BS, and a tip from the bottom step portion BS. It can be divided into three sections, a section B2 up to the stepped portion TS (point P1) and a section B3 from the tooth tip stepped portion TS (P1) to the end point EP.
  • the lap heights from the tooth bottom surfaces 17a, 21a to the tooth tip surfaces 18a, 22a in these three sections B1, B2, B3 are also H1, H2, H3, respectively, and the magnitude relationship is H1 ⁇ H2 ⁇ H3. ing.
  • the fixed wrap wall 18 and the swirl wrap wall 22 are excluded from the effective spiral length of the section on the inner peripheral side in the spiral direction from the tooth tip step portion TS, that is, the non-involute section from the start point SP to 0 °.
  • the spiral length of the section B1 from 0 ° to the tooth tip step portion TS is less than 360 °. That is, when the fixed wrap wall body 18 and the swirl wrap wall body 22 are combined, the circumferential length in which the sections A1 and B1 + B2 on the inner peripheral side of the respective wrap wall bodies 18 and 22 overlap is less than one round. , And the turning radius ⁇ of the orbiting scroll is set larger.
  • the tooth bottom surface 17a on the outer circumferential side of the spiral step portion BS Only the abdominal surfaces of the spiral wrap walls 18 and 22 adjacent to 21a are made to recede slightly inward from the original side profile to the extent that the refrigerant compression is not adversely affected. That is, the surface is retracted in the section A3 on the abdominal surface side of the wrap wall bodies 18 and 22.
  • the range in which the surface is retracted is indicated by symbol xxx
  • the range in which the surface is retracted is shaded.
  • the setting conditions for the reverse amount are the same as those in the first embodiment.
  • the lap wall bodies 18 and 22 are in contact with each other in the sections A3 and B3 on the outermost circumference side in the spiral direction because the lap height H3 is the highest and the risk of breakage is greater. Therefore, it is possible to prevent damage due to contact between the wrap wall bodies 18 and 22.
  • the side surfaces of the spiral wrap wall bodies (18, 22) are retracted inward in the section A1 + A2 on the inner circumferential side in the spiral direction with respect to the stepped portion BS on the abdominal surface side and in all sections B1 + B2 + B3 on the rear side.
  • the original side profile is maintained.
  • the section on the inner peripheral side in the spiral direction with respect to the tooth step portion TS that is, the section A1 on the abdominal surface side and the section B1 + B2 on the back side, both have a spiral length of less than 360 °.
  • the spiral length exceeds 360 °.
  • the spiral length exceeds 360 ° (see also FIG. 11).
  • the present configuration and design method only the abdominal surface side of the entire circumference of the wrap wall bodies 18 and 22 is retracted in the outermost circumferential side section A3 where the wrap height is the highest, and the other sections A1 and A2 and the rear side In the sections B1, B2 and B3, neither the ventral side nor the back side is retracted.
  • coolant can be suppressed and it can prevent the fall of the compression efficiency in a scroll compressor with a small number of winding of the wrap wall bodies 18 and 22 especially. it can.
  • the amount of retreat of the abdominal surface of the wrap wall bodies 18 and 22 may be gradually decreased from the outer peripheral side in the spiral direction toward the inner peripheral side at the position of the tooth bottom step portion BS. This prevents the generation of noise due to interference between the wrap wall bodies 18 and 22 of the opposing scrolls 16 and 20 with the burrs that are likely to occur when the bottom plate step BS is processed and formed on the end plates 17 and 21. be able to.
  • the spiral wrap wall body is prevented from being damaged in the section where the wrap height is high, and durability and reliability are improved. Therefore, it is possible to prevent the compression performance from being lowered by minimizing the compression leakage.
  • the present invention is not limited to the configuration of the above-described embodiment, and can be appropriately changed or improved. Embodiments with such changes and improvements are also included in the scope of the right of the present invention.
  • the internal configuration of the stepped scroll compressor 1 the posture arrangement such as the vertical type and the horizontal type, the application, the type of fluid to be compressed, and the detailed shape of the fixed scroll 16 and the orbiting scroll 20 are not necessarily described above. It is not necessary to conform to the embodiment.
  • the tooth bottom surface portions 17a and 21a of both the fixed scroll 16 and the orbiting scroll 20 are provided with a tooth bottom step portion BS, and both the tooth tip surfaces 18a and 22a are provided with a tooth tip step portion TS.
  • the present invention can also be applied to a model in which only one tooth bottom step portion BS is provided on one scroll and only the tooth tip step portion TS is provided on the other scroll.
  • both the fixed wrap wall body 18 of the fixed scroll 16 and the orbiting wrap wall body 22 of the orbiting scroll 20 have their abdominal surfaces and back surfaces retreated. It is also conceivable that only the lap wall is retreated. In this case, contact with the opposite wrap is prevented only for either the abdominal surface or the back surface of the wrap wall.

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

Abstract

La présente invention concerne un compresseur à spirale étagé selon laquelle afin d'empêcher l'endommagement des parois de recouvrement dans un compresseur à spirale étagé et d'augmenter la durabilité et la fiabilité, une partie d'étage de base de dents (BS), dont la hauteur augmente du côté circonférentiel extérieur au côté circonférentiel intérieur dans la direction de la spirale d'une paroi de recouvrement en spirale (18, 22), est ménagée sur une surface latérale d'une plaque d'extrémité (17, 21) d'une spirale fixe (16) et/ou d'une spirale rotative (20). Une partie étagée en pointe de dent (TS), qui s'abaisse du côté circonférentiel extérieur au côté circonférentiel intérieur dans la direction de la spirale, est ménagée dans la paroi de recouvrement en spirale (18, 22) de l'autre spirale correspondante (16, 20). Parmi ces parois de recouvrement en spirale (18, 22), seule la surface ventrale de la paroi de recouvrement en spirale (18, 22) qui est adjacente à la surface de base de dent (17a, 21a), plus proche du côté circonférentiel externe dans la direction de la spirale que la partie d'étage de base de dent (BS), et qui se trouve dans une plage chevauchant au moins la paroi de recouvrement en spirale correspondante (18, 22) est évidée plus vers l'intérieur que le profil de surface latérale d'origine de cette dernière.
PCT/JP2017/023425 2016-07-15 2017-06-26 Compresseur à spirale étagé et son procédé de conception WO2018012268A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP17827398.3A EP3441614A4 (fr) 2016-07-15 2017-06-26 Compresseur à spirale étagé et son procédé de conception
CN201780026502.3A CN109072912B (zh) 2016-07-15 2017-06-26 阶梯式涡旋压缩机及其设计方法

Applications Claiming Priority (2)

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JP2016-140551 2016-07-15
JP2016140551A JP6758969B2 (ja) 2016-07-15 2016-07-15 段付きスクロール圧縮機およびその設計方法

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WO2020234988A1 (fr) * 2019-05-21 2020-11-26 三菱電機株式会社 Compresseur à spirales
EP3754197A4 (fr) * 2018-02-21 2021-07-28 Mitsubishi Heavy Industries Thermal Systems, Ltd. Machine à fluide à spirale et procédé d'usinage d'élément à spirale

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JP6599099B2 (ja) * 2014-12-15 2019-10-30 三菱重工サーマルシステムズ株式会社 スクロール流体機械

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JP2007224775A (ja) 2006-02-22 2007-09-06 Mitsubishi Heavy Ind Ltd スクロール圧縮機
JP2007255191A (ja) * 2006-03-20 2007-10-04 Mitsubishi Heavy Ind Ltd スクロール圧縮機
JP2011074884A (ja) * 2009-10-01 2011-04-14 Mitsubishi Heavy Ind Ltd スクロール流体機械
JP2014152748A (ja) * 2013-02-13 2014-08-25 Panasonic Corp スクロール圧縮機

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JP4658381B2 (ja) * 2001-05-31 2011-03-23 三菱重工業株式会社 スクロール圧縮機
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JP5622473B2 (ja) * 2010-07-30 2014-11-12 三菱重工業株式会社 スクロール圧縮機
JP5888897B2 (ja) * 2011-08-05 2016-03-22 三菱重工業株式会社 スクロール部材及びスクロール型流体機械

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JP2000170671A (ja) * 1998-09-29 2000-06-20 Tokico Ltd スクロ―ル式流体機械
JP2007224775A (ja) 2006-02-22 2007-09-06 Mitsubishi Heavy Ind Ltd スクロール圧縮機
JP2007255191A (ja) * 2006-03-20 2007-10-04 Mitsubishi Heavy Ind Ltd スクロール圧縮機
JP2011074884A (ja) * 2009-10-01 2011-04-14 Mitsubishi Heavy Ind Ltd スクロール流体機械
JP2014152748A (ja) * 2013-02-13 2014-08-25 Panasonic Corp スクロール圧縮機

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3754197A4 (fr) * 2018-02-21 2021-07-28 Mitsubishi Heavy Industries Thermal Systems, Ltd. Machine à fluide à spirale et procédé d'usinage d'élément à spirale
WO2020234988A1 (fr) * 2019-05-21 2020-11-26 三菱電機株式会社 Compresseur à spirales
JPWO2020234988A1 (ja) * 2019-05-21 2021-10-21 三菱電機株式会社 スクロール圧縮機

Also Published As

Publication number Publication date
JP6758969B2 (ja) 2020-09-23
EP3441614A1 (fr) 2019-02-13
EP3441614A4 (fr) 2019-06-05
CN109072912A (zh) 2018-12-21
CN109072912B (zh) 2021-05-07
JP2018009553A (ja) 2018-01-18

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