EP3751143B1 - Machine hydraulique à spirale - Google Patents

Machine hydraulique à spirale Download PDF

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Publication number
EP3751143B1
EP3751143B1 EP19758318.0A EP19758318A EP3751143B1 EP 3751143 B1 EP3751143 B1 EP 3751143B1 EP 19758318 A EP19758318 A EP 19758318A EP 3751143 B1 EP3751143 B1 EP 3751143B1
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EP
European Patent Office
Prior art keywords
wall
plate
inclined part
region
peripheral side
Prior art date
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EP19758318.0A
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German (de)
English (en)
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EP3751143A1 (fr
EP3751143A4 (fr
Inventor
Hajime Sato
Youhei Hotta
Yoshiyuki Kimata
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Heavy Industries Thermal Systems Ltd
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Mitsubishi Heavy Industries Thermal Systems Ltd
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Publication of EP3751143A4 publication Critical patent/EP3751143A4/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
    • F04C18/0215—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents both members having co-operating elements in spiral form where only one member is moving
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • 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
    • F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
    • F04C29/04—Heating; Cooling; Heat insulation
    • F04C29/042—Heating; Cooling; Heat insulation by injecting a fluid

Definitions

  • the present invention relates to a scroll fluid machine.
  • a scroll fluid machine in which a fixed scroll member and an orbiting scroll member each having a spiral wall body provided on an end plate are meshed with each other and an orbiting and revolving motion is performed to compress or expand a fluid.
  • a scroll compressor in the scroll fluid machine is an apparatus that compresses a refrigerant circulating in a refrigeration cycle applied to an air conditioner, for example.
  • a two-stage compression refrigeration cycle may be used in which a refrigerant is compressed in two stages to improve performance of a heat pump and improve the coefficient of performance (COP).
  • an economizer gas-liquid separator
  • Such a refrigeration cycle is also referred to as a gas injection cycle or an economizer cycle.
  • one of the following three types is required as a structure of the compressor.
  • a two-stage compressor in which a high-stage compression portion and a low-stage compression portion are housed in a single compressor, an intermediate-pressure refrigerant is introduced between a discharge side of the low-stage compression portion and a suction side of the high-stage compression portion.
  • Two single-stage compressors with only one compression portion are connected in series, and an intermediate-pressure refrigerant is introduced between a discharge side of the low-stage compressor and a suction side of the high-stage compressor.
  • an intermediate-pressure refrigerant is introduced in the middle of a compression process of the compression portion.
  • PTL 2 discloses a scroll type compressor with fixed and orbiting scrolls provided with steps which delimit different axial height interfitting wrap zones.
  • a wall-body stepped part is formed at an upper edge of a wall body of a scroll compressor, and, on the wall body, a higher part is formed to have a higher height from the wall-body stepped part toward a center in a spiral direction and a lower part is formed to have a lower height toward an outer peripheral end.
  • An end-plate stepped part is formed on one side surface of an end plate on which the wall body is erected, and, on the one side surface, a low surface part is formed to have a lower surface from the end-plate stepped part toward a center in the spiral direction and a high surface part is formed to have a high surface toward the outer peripheral end.
  • the end-plate stepped part is formed at a position opposite to the wall-body stepped part.
  • a fluid supply portion is provided in a region of the low surface part in the vicinity of the end-plate stepped part to supply a fluid having a pressure higher than a fluid pressure in a compression chamber into the compression chamber.
  • the lower part and the higher part are switched or the high surface part and the low surface part are switched from the outer peripheral end side in the spiral direction toward the center, so that the change in volume is adjusted only by the height and position of the step. Therefore, it is difficult to provide a section where the volume is substantially constant, and the degree of freedom is low during setting of an orbiting angle range of the section where the volume is substantially constant.
  • the present invention has been made in view of such circumstances, and an object thereof is to provide a scroll fluid machine capable of reliably introducing an intermediate-pressure refrigerant during a compression process or an expansion process.
  • a scroll fluid machine of the present invention employs the following solutions.
  • a scroll compressor includes: a first scroll member in which a first wall body having a spiral shape is provided on a first end plate; and a second scroll member in which a second wall body having a spiral shape is provided on a second end plate disposed so as to face the first end plate, the second scroll member being configured to perform a relative orbiting and revolving motion such that the second wall body is meshed with the first wall body to form a sealed space, wherein after sealing of the sealed space is started, a first region is set in which a volume change of the sealed space is gradual or substantially constant, at least one of the first end plate and the second end plate includes a first wall-body inclined part in which a height of the wall body continuously increases from an outer peripheral side to an inner peripheral side in a spiral direction, at least one of the first wall body and the second wall body includes a first end-plate inclined part in which a tooth bottom opposite to a tooth tip of the first wall-body inclined part is inclined according to an inclination of the first wall-body inclined
  • the first scroll member and the second scroll member relatively perform an orbiting and revolving motion, and the second wall body is meshed with the first wall body to form the sealed space. Then, after the sealing of the sealed space is started by the orbiting and revolving motion, the first region is set in which the volume change of the sealed space is gradual or substantially constant.
  • the height of the wall body in the first wall-body inclined part continuously increases from the outer peripheral side to the inner peripheral side in the spiral direction, and the tooth bottom of the first end-plate inclined part opposite to the tooth tip of the first wall-body inclined part is inclined according to the inclination of the first wall-body inclined part.
  • the width of the sealed space decreases according to the spiral shape of the wall body during the orbiting and revolving motion, and the height of the sealed space, that is, the distance between the opposing surfaces of the end plates increases.
  • at least a part of the first region where the volume change of the sealed space is gradual or substantially constant is set by the positions and the shapes of the first wall-body inclined part and the first end-plate inclined part.
  • the height of the wall body continuously increases, so that fluid leakage can be reduced compared with the conventional stepped scroll fluid machine in which a stepped part is provided on the wall body and the tooth bottom.
  • the inclinations of the first wall-body inclined part and the first end-plate inclined part are not limited to a smoothly connected inclination, but may include a form that is visually recognized as being continuously inclined as viewed in the entire first wall-body inclined part in which small steps are connected in the form of steps.
  • the first wall-body inclined part and the first end-plate inclined part may be provided on both the first scroll member and the second scroll member, or may be provided on any one of both scroll members.
  • the other wall body and one end plate may be flat, or may have a shape combined with the stepped shape of the related art.
  • a fluid supply portion may be provided on the first end plate or the second end plate to supply a fluid having a pressure higher than a fluid pressure in the sealed space into the sealed space, and the fluid supply portion may be provided in the first region.
  • the fluid supply portion is provided on the first end plate or the second end plate, and the fluid supply portion supplies the fluid having the pressure higher than the fluid pressure in the sealed space into the compressor chamber. Then, since the fluid supply portion is provided in the first region where the volume change of the sealed space is gradual or substantially constant, the fluid can be supplied to the sealed space while the pressure difference from the fluid to be supplied is maintained at a predetermined value or more in the process where the increase in pressure in the sealed space is gradual or substantially constant.
  • a second region, in which a volume of the sealed space decreases may be set before the first region, and a third region, in which the volume of the sealed space decreases, may be set behind the first region.
  • the second region in which the volume of the sealed space decreases
  • the second region is set before the first region, so that the pressure in the sealed space increases as the fluid moves toward the inner peripheral side in the second region before the first region.
  • the pressure-increased fluid moves toward the inner peripheral side in the first region, the pressure in the sealed space is kept substantially constant.
  • the third region in which the volume of the sealed space decreases, is set behind the first region, the pressure in the sealed space increases again as the fluid moves toward the inner peripheral side in the third region behind the first region.
  • At least one of the first wall body and the second wall body may include a second wall-body inclined part in which a height of the wall body continuously decreases from the outer peripheral side to the inner peripheral side in the spiral direction
  • at least one of the first wall body and the second wall body may include a second end-plate inclined part in which the tooth bottom opposite to the tooth tip of the first wall-body inclined part is inclined according to an inclination of the second wall-body inclined part
  • at least a part of each of the second region and the third region may be set by positions and shapes of the second wall-body inclined part and the second end-plate inclined part.
  • the height of the wall body in the second wall-body inclined part decreases from the outer peripheral side to the inner peripheral side, and the tooth bottom of the second end-plate inclined part opposite to the tooth tip of the second wall-body inclined part is inclined according to the inclination of the second wall-body inclined part. Accordingly, at least a part of the each of the second region and the third region where the volume of the sealed space decreases is set by the positions and the shapes of the second wall-body inclined part and the second end-plate inclined part.
  • the fluid sucked from the outer peripheral side is not only compressed by the reduction of the width of the sealed space corresponding to the spiral shape of the wall body, but also further compressed by the reduction of the height of the sealed space, that is, the distance between the opposing surfaces of the end plates.
  • the height of the sealed space that is, the distance between the opposing surfaces of the end plates.
  • a height of a tooth tip at an outer peripheral side end of the second wall-body inclined part disposed closer to the outer peripheral side compared with the first wall-body inclined part may be equal to a height of a tooth tip at an inner peripheral side end of the first wall-body inclined part.
  • a height of a tooth bottom at an outer peripheral side end of the second end-plate inclined part disposed closer to the outer peripheral side compared with the first end-plate inclined part may be equal to a height of a tooth bottom at an inner peripheral side end of the first end-plate inclined part.
  • tip seals may be provided at the tooth tips of the first wall body and the second wall body, respectively, to seal the fluid by contacting with the tooth bottoms opposite to the tooth tips.
  • a coating may be provided on at least one of the tooth tips of the first wall body and the second wall body and the tooth bottoms opposite to the tooth tips.
  • the coating is provided on at least one of the tooth tips of the first wall body and the second wall body and the tooth bottoms opposite to the tooth tips, and thus it is possible to compensate the machining variation of the inclined part, which is difficult to obtain the machining accuracy, by the film thickness of the coating. Thereby, it is possible to further prevent the fluid leakage.
  • wall-body flat parts which do not change in height, may be provided on outermost peripheral parts and/or innermost peripheral parts of the first wall body and the second wall body, and end-plate flat parts corresponding to the wall-body flat parts may be provided on the first end plate and the second end plate.
  • the flat parts are provided on the outermost peripheral parts and/or the innermost peripheral parts of the wall body and the end plate, so that the shape measurement is performed with high accuracy. Thereby, it becomes easy to manage the size and tip clearance of the scroll shape.
  • the wall-body flat parts and the end-plate flat parts may be provided over a region of 180° around a center of the first scroll member or the second scroll member.
  • the wall-body flat part and the end-plate flat part are preferably within the region of 180°.
  • the region of 180° is not strict, and an angle slightly exceeding 180° is allowed within a range where the fluid leakage does not increase.
  • the intermediate-pressure refrigerant can be reliably introduced during the compression process, and the pressure increase in the sealed space can be prevented.
  • the efficiency of the compressor can be improved. Since the height of the wall body continuously increases, fluid leakage can be reduced compared with the conventional stepped scroll fluid machine in which a stepped part is provided on the wall body and the tooth bottom.
  • a refrigeration cycle 10 includes a scroll compressor 1 that compresses a refrigerant (fluid), a condenser 2 that radiates heat of the compressed refrigerant to the outside, a first expansion valve 3 that is provided on a high pressure side to decompress the refrigerant flowing out from the condenser 2, an economizer (gas-liquid separator) 4 that separates the decompressed refrigerant into a liquid refrigerant and a gas refrigerant, a second expansion valve 5 that is provided on a low pressure side to further decompress a liquid refrigerant, an evaporator 6 that causes the decompressed refrigerant to absorb heat, and an injection flow passage 7 that guides the gas refrigerant from the economizer 4 to the scroll compressor 1.
  • a scroll compressor 1 that compresses a refrigerant (fluid)
  • a condenser 2 that radiates heat of the compressed refrigerant to the outside
  • a first expansion valve 3 that is provided
  • the scroll compressor 1 is a hermetic type compressor, and includes a housing 11 having a hermetically sealed space therein, a scroll compression mechanism 12 that is disposed in the housing 11 and compresses a refrigerant taken in the hermetically sealed space, a rotating shaft that transmits a rotational force to the scroll compression mechanism 12, and an electric motor that revolves an orbiting scroll 19 of the scroll compression mechanism 12 through the rotating shaft, as main components, as illustrated in Fig. 2 .
  • the housing 11 has a bottom sealed by a lower cover, and includes a vertically elongated cylindrical intermediate cover 13 at an upper part of the lower cover.
  • a discharge cover 14 and an upper cover 15 are provided at an upper part of the intermediate cover 13 to hermetically seal the housing 11, and a discharge chamber 16, from which compressed high-pressure gas is discharged, is formed between the discharge cover 14 and the upper cover 15.
  • the scroll compression mechanism 12 is incorporated in the housing 11, and the electric motor including a stator and a rotor is installed below the scroll compression mechanism.
  • the stator is fixedly installed in the housing 11, so that the electric motor is incorporated, and the rotating shaft is fixed to the rotor.
  • the scroll compression mechanism 12 includes a fixed scroll 18 fixedly installed in the housing 11 and the orbiting scroll 19 that is slidably supported and is meshed with the fixed scroll 18 to form a compression chamber 20.
  • a suction port (not illustrated), which sucks a refrigerant, is formed in a side surface of the housing 11 to communicate with the sealed space, and a discharge port 15a is formed on a top side of the upper cover 15 to communicate with the discharge chamber 16 and discharge compressed refrigerant gas.
  • the scroll compression mechanism 12 sucks refrigerant gas, which is sucked into the housing 11 through a suction pipe and the suction port, from a suction port 21 on an outer peripheral side opened to the inside of the housing 11 into the compression chamber 20, and compresses the sucked refrigerant gas.
  • the compressed refrigerant gas is discharged into the discharge chamber 16 through a discharge port 22 provided at a central part of the fixed scroll 18 and a discharge port 23 provided in the discharge cover 14, and is further sent out to the outside of the compressor through a discharge pipe 24 provided in the upper cover 15 and communicating with the discharge chamber 16.
  • the discharge cover 14 is provided with an injection pipe 25 that penetrates the upper cover 15, and an intermediate-pressure refrigerant is introduced from the outside into the compression chamber 20 of the scroll compression mechanism 12 through the injection pipe 25.
  • the refrigerant is supplied to the compression chamber 20 through the injection pipe 25 and an injection port (a fluid supply portion) 26.
  • the reed valve 27 regulates a flow of the refrigerant in only one direction.
  • the reed valve 27 is provided, so that the refrigerant flows from the compression chamber 20 toward the discharge chamber 16.
  • the fixed scroll 18 includes a substantially disk-shaped end plate (a first end plate) 18a and a spiral wall body (a first wall body) 18b erected on one side surface of the end plate 18a.
  • the orbiting scroll 19 includes a substantially disk-shaped end plate (a second end plate) 19a and a spiral wall body (a second wall body) 19b erected on one side surface of the end plate 19a.
  • the respective spiral shapes of the wall bodies 18b and 19b are defined using, for example, an involute curve or an Archimedean spiral curve.
  • the fixed scroll 18 and the orbiting scroll 19 are meshed with each other in a state where centers O1 and O2 thereof are separated by an orbiting radius ⁇ and phases of the wall bodies 18b and 19b are shifted by 180°, and are assembled such that slight clearances (tip clearances) in a height direction are present between tooth tips and tooth bottoms of the wall bodies 18b and 19b of the both scrolls 18 and 19 at room temperature. Consequently, between the both of the scrolls 18 and 19, a plurality of pairs of the compression chambers 20 surrounded by the end plates 18a and 19a and the wall bodies 18b and 19b are symmetrically formed with respect to the centers of the scrolls.
  • the orbiting scroll 19 revolves around the fixed scroll 18 by a rotation preventing mechanism such as an oldham ring (not illustrated).
  • the inclination of the tooth tip in the wall bodies 18b and 19b and the inclination of the tooth bottom in the end plates 18a and 19a are set such that a distance L between opposing surfaces of both the end plates 18a and 19a facing each other continuously decreases or increases from the outer peripheral sides to the inner peripheral sides of the spiral wall bodies 18b and 19b.
  • a wall-body flat part 18b1 As illustrated in Figs. 3 , 5 , and 6 , on the wall body 18b of the fixed scroll 18, a wall-body flat part 18b1, a second wall-body inclined part 18b2, a wall-body flat part 18b3, a first wall-body inclined part 18b4, a wall-body flat part 18b5, a second wall-body inclined part 18b6, and a wall-body flat part 18b7 are provided in this order from the outer peripheral side to the inner peripheral side. As illustrated in Figs.
  • an end-plate flat part 18a1, a second end-plate inclined part 18a2, an end-plate flat part 18a3, a first end-plate inclined part 18a4, an end-plate flat part 18a5, a second end-plate inclined part 18a6, and an end-plate flat part 18a7 are provided in this order from the outer peripheral side to the inner peripheral side.
  • a wall-body flat part 19b1, a second wall-body inclined part 19b2, a wall-body flat part 19b3, a first wall-body inclined part 19b4, a wall-body flat part 19b5, a second wall-body inclined part 19b6, and a wall-body flat part 19b7 are provided in this order from the outer peripheral side to the inner peripheral side.
  • a wall-body flat part 19b1, a second wall-body inclined part 19b2, a wall-body flat part 19b3, a first wall-body inclined part 19b4, a wall-body flat part 19b5, a second wall-body inclined part 19b6, and a wall-body flat part 19b7 are provided in this order from the outer peripheral side to the inner peripheral side.
  • an end-plate flat part 19a1, a second end-plate inclined part 19a2, an end-plate flat part 19a3, a first end-plate inclined part 19a4, an end-plate flat part 19a5, a second end-plate inclined part 19a6, and an end-plate flat part 19a7 are provided in this order from the outer peripheral side to the inner peripheral side.
  • Each of the wall-body flat parts 19b1, 19b3, 19b5, and 19b7 provided on the wall body 19b of the orbiting scroll 19 has a constant height from the outer peripheral side to the inner peripheral side.
  • a dimension in an axial direction passing through the center 02 (see Fig. 2 ) of the orbiting scroll 19 is constant.
  • heights of the wall body and the tooth bottom mean the dimensions in the axial direction passing through the centers O1 and 02, respectively.
  • the wall-body flat parts 19b1 and 19b7 having the constant height are provided on the outermost peripheral side and the innermost peripheral side of wall body 19b of the orbiting scroll 19, respectively.
  • These wall-body flat parts 19b1 and 19b7 are provided over a region of 180° (for example, 180° or more and 360° or less, and preferably 210° or less) around the center 02 (see Fig. 2 ) of the orbiting scroll 19, as illustrated in Fig. 8 .
  • end-plate flat parts 19a1 and 19a7 having a constant height are provided on the tooth bottom of the end plate 19a of the orbiting scroll 19.
  • These end-plate flat parts 19a1 and 19a7 are also provided over a region of 180° (for example, 180° or more and 360° or less, and preferably 210° or less) around the center 02 of the orbiting scroll 19.
  • the fixed scroll 18 is also provided with the wall-body flat parts 18b1 and 18b7 and the end-plate flat parts 18a1 and 18a7.
  • the wall-body flat parts 18b1 and 18b7 and the end-plate flat parts 18a1 and 18a7 are also provided over a region of 180° (for example, 180° or more and 360° or less, and preferably 210° or less) around the center O1 of the fixed scroll 18.
  • the height of the first wall-body inclined part 19b4 provided on the wall body 19b of the orbiting scroll 19 continuously increases from the outer peripheral side to the inner peripheral side.
  • the first end-plate inclined part 18a4 is provided to be inclined according to the inclination of the first wall-body inclined part 19b4.
  • the first wall-body inclined part 18b4 provided on the wall body 18b of the fixed scroll 18 also continuously increases from the outer peripheral side to the inner peripheral side, and as illustrated in Fig.
  • the first end-plate inclined part 19a4 is provided to be inclined according to the inclination of the first wall-body inclined part 18b4.
  • the length in the spiral direction of the first wall-body inclined parts 18b4 and the 19b4 and the length in the spiral direction of the first end-plate inclined parts 18a4 and 19a4 are 20° or more, and preferably 180° or more around the centers O1 and 02, respectively.
  • the width of the compression chamber 20 decreases according to the spiral shapes of the wall bodies 18b and 19b during an orbiting and revolving motion of the orbiting scroll 19, and the height of the compression chamber 20, that is, the distance between the opposing surfaces of the end plates 18a and 19a increases. Accordingly, at least a part of the first region where the volume change of the compression chamber 20 is gradual or substantially constant is set by the positions and the shapes in the spiral direction (for example, the inclination angle and the length in the spiral direction) of the first wall-body inclined parts 18b4 and 19b4 and the first end-plate inclined parts 18a4 and 19a4. As the fluid sucked from the suction port 21 on the outer peripheral side is directed toward the inner peripheral side, the pressure in the compression chamber 20 is kept substantially constant in the first region.
  • Only one first wall-body inclined part 18b4 or 19b4 or one first end-plate inclined part 18a4 or 19a4 is provided in the spiral direction, so that the first region may be set, or a plurality of first wall-body inclined parts 18b4 and 19b4 or a plurality of first end-plate inclined parts 18a4 and 19a4 are provided in series, so that the first region may be set.
  • the plurality of first wall-body inclined parts 18b4 and 19b4 or the plurality of first end-plate inclined parts 18a4 and 19a4 are provided in series, the first region is set with different inclination angles of the respective inclined parts and with the wall-body flat part or the end-plate flat part interposed therebetween.
  • the end plate 18a of the fixed scroll 18 is provided with the injection port 26 that supplies a refrigerant having a pressure higher than the pressure of the fluid in the compression chamber 20 into the compression chamber 20.
  • the injection port 26 supplies a refrigerant having a pressure higher than the pressure of the fluid in the compression chamber 20 into the compression chamber 20.
  • the heights of the second wall-body inclined parts 19b2 and 19b6 provided on the wall body 19b of the orbiting scroll 19 continuously decrease from the outer peripheral side to the inner peripheral side.
  • the second end-plate inclined parts 18a2 and 18a6 are provided to be inclined according to the inclinations of the second wall-body inclined parts 19b2 and 19b6.
  • the second wall-body inclined parts 18b2 and 18b6 provided on the wall body 18b of the fixed scroll 18 also continuously decrease from the outer peripheral side to the inner peripheral side, and on the tooth bottom on the end plate 19a of the orbiting scroll 19 facing the tooth tips of the second wall-body inclined parts 18b2 and 18b6, the second end-plate inclined parts 19a2 and 19a6 are provided to be inclined according to the inclinations of the second wall-body inclined parts 18b2 and 18b6.
  • the width of the compression chamber 20 decreases according to the spiral shapes of the wall bodies 18b and 19b during the orbiting and revolving motion of the orbiting scroll 19, and the height of the compression chamber 20, that is, the distance between the opposing surfaces of the end plates 18a and 19a decreases. Accordingly, at least a part of each of a second region and a third region where the volume of the compression chamber 20 decreases is set by the positions and the shapes in the spiral direction (for example, the inclination angles and the lengths in the spiral direction) of the second wall-body inclined parts 18b2, 18b6, 19b2, and 19b6 and the second end-plate inclined parts 18a2, 18a6, 19a2, and 19a6.
  • the refrigerant sucked from the suction port 21 on the outer peripheral side is not only compressed by the reduction of the width of the compression chamber 20 corresponding to the spiral shapes of the wall bodies 18b and 19b, but also further compressed by the reduction of the height of the compression chamber 20, that is, the distance between the opposing surfaces of the end plates 18a and 19a.
  • the compression chamber 20 corresponding to the spiral shapes of the wall bodies 18b and 19b
  • the height of the compression chamber 20 that is, the distance between the opposing surfaces of the end plates 18a and 19a.
  • the second region in which the volume of the compression chamber 20 decreases, is set before the first region in the moving direction of the compression chamber 20 accompanying the orbiting and revolving motion of the orbiting scroll 19, and the third region is set behind the first region in the moving direction of the compression chamber 20.
  • the second region is a region from when the wall bodies 18b and 19b are meshed with each other on the outer peripheral side to form the compression chamber 20 and are closed until the first region starts to be set.
  • the third region is a region from when the first region is completed until the discharge of the compressed refrigerant is finished from the discharge port 22.
  • the pressure in the compression chamber 20 increases as the refrigerant moves toward the inner peripheral side in the second region before the first region.
  • the pressure-increased refrigerant moves toward the inner peripheral side in the first region, the pressure in the compression chamber 20 is kept substantially constant.
  • the third region in which the volume of the compression chamber 20 decreases, is set behind the first region, the pressure in the compression chamber 20 increases again as the refrigerant moves toward the inner peripheral side in the third region behind the first region.
  • a low-stage compression process is performed in the second region, and a high-stage compression process is performed in the third region.
  • the gradual volume change or the substantially constant volume change of the compression chamber 20 in the first region means that the volume change is gradual or substantially constant compared with the volume change of the compression chamber 20 in the second region or the third region.
  • a two-stage compression refrigeration cycle is realized in which the refrigerant is introduced from the economizer 4 through the injection flow passage 7 and the injection port 26 during the compression process of the scroll compression mechanism 12.
  • the first region in which the volume change of the compression chamber 20 is gradual or substantially constant, is provided, and the intermediate-pressure refrigerant can be introduced from the economizer 4 during the compression process of the scroll compression mechanism 12 in the single-stage scroll compressor 1 including only one scroll compression mechanism 12.
  • the meaning of "continuous" in the first wall-body inclined parts 18b4 and 19b4, the first end-plate inclined parts 18a4 and 19a4, the second wall-body inclined parts 18b2, 18b6, 19b2, and 19b6, and the second end-plate inclined parts 18a2, 18a6, 19a2, and 19a6 is not limited to a smoothly connected inclination, but may include a form that is visually recognized as being continuously inclined as viewed in the entire inclined part in which small steps inevitably generated during manufacturing such as machining or additive manufacturing (AM) are connected in the form of steps. Note that a large step such as a so-called stepped scroll is not included.
  • a coating is provided on the first wall-body inclined parts 18b4 and 19b4, the first end-plate inclined parts 18a4 and 19a4, the second wall-body inclined parts 18b2, 18b6, 19b2, and 19b6, and the second end-plate inclined parts 18a2, 18a6, 19a2, and 19a6.
  • the coating include manganese phosphate treatment and nickel phosphor plating.
  • the height of the tooth tip at the outer peripheral side ends 18b8 and 19b8 of the second wall-body inclined parts 18b2 and 19b2 disposed closer to the outer peripheral side compared with the first wall-body inclined parts 18b4 and 19b4 may be equal to the height of the tooth tip at the inner peripheral side ends 18b9 and 19b9 of the first wall-body inclined parts 18b4 and 19b4.
  • the tooth bottom height at the outer peripheral side ends 18a8 and 19a8 of the second end-plate inclined parts 18a2 and 19a2 disposed closer to the outer peripheral side compared with the first end-plate inclined parts 18a4 and 19a4 may be equal to the tooth bottom height at the inner peripheral side ends 18a9 and 19a9 of the first end-plate inclined parts 18a4 and 19a4.
  • a tip seal is provided in the tooth tip of the wall body 18b of the fixed scroll 18.
  • the tip seal is made of resin, and contacts with the tooth bottom of the end plate 19a of the opposite orbiting scroll 19 to seal the fluid.
  • the tip seal is housed in a tip seal groove 18d formed in the tooth tip of the wall body 18b in a circumferential direction.
  • a tip seal groove 19d is also formed in the tooth tip of the wall body 19b of the orbiting scroll 19, and a tip seal is provided in the tip seal groove 19d.
  • Fig. 11A illustrates a small tip clearance T
  • Fig. 11B illustrates a large tip clearance T.
  • the scroll compressor 1 described above operates as follows.
  • the orbiting scroll 19 revolves around the fixed scroll 18 by a driving source such as an electric motor (not illustrated).
  • a driving source such as an electric motor (not illustrated).
  • the fluid is sucked from the outer peripheral side of each of the scrolls 18 and 19, and the refrigerant is taken into the compression chamber 20 surrounded by the wall bodies 18b and 19b and the end plates 18a and 19a.
  • the refrigerant in the compression chamber 20 is compressed in the second region as moving from the outer peripheral side to the inner peripheral side, and the pressure in the compression chamber 20 increases as illustrated in Fig. 12 .
  • the compressed refrigerant moves to the first region, and the refrigerant moves toward the inner peripheral side in the first region.
  • the intermediate-pressure refrigerant is supplied to the compression chamber 20 from the economizer 4 through the injection pipe 25 and the injection port (fluid supply portion) 26.
  • the pressure change in the compression chamber 20 is gradual or substantially constant, and the fluid can be supplied to the compression chamber 20 while the pressure difference from the refrigerant supplied from the economizer 4 is maintained at a predetermined value or more.
  • the refrigerant moves to the third region, the refrigerant is compressed as moving toward the inner peripheral side in the third region, and the pressure in the compression chamber 20 increases again as illustrated in Fig. 12 .
  • the compressed refrigerant is finally discharged from the discharge port 22 formed in the fixed scroll 18.
  • the first region is set in which the volume change of the compression chamber 20 is gradual or substantially constant. Since the injection port 26 is provided in the first region, it is possible to reliably supply the refrigerant into the compression chamber 20 while maintaining the pressure difference with the supplied refrigerant at a predetermined value or more in the process where the pressure change in the compression chamber 20 is gradual or substantially constant.
  • the inclined part continuously increases or decreases, so that fluid leakage can be reduced compared with the conventional stepped scroll fluid machine in which a stepped part is provided on the wall body and the tooth bottom.
  • the tip seal 28 is provided at the tooth tip of each of the wall bodies 18b and 19b, even when the tip clearance T (see Figs. 11A and 11B ) between the tooth tip and the tooth bottom in the inclined part changes according to the orbiting motion, the tip seal can be made to follow up, and fluid leakage can be prevented.
  • the coating is provided on the wall bodies 18b and 19b and/or the end plates 18a and 19a.
  • the wall-body flat parts 18b1, 18b7, 19b1, and 19b7 and the end-plate flat parts 18a1, 18a7, 19a1, and 19a7 are provided on the outermost peripheral parts and the innermost peripheral parts of the wall bodies 18b and 19b and the end plates 18a and 19a.
  • the wall-body flat parts 18b1, 18b7, 19b1, and 19b7 and the end-plate flat parts 18a1, 18a7, 19a1, and 19a7 are provided over the region of 180°, the flat parts on both sides from the centers 01 and 02 of the scrolls 18 and 19 can be measured.
  • the shape dimension of the fixed scroll 18 or the orbiting scroll 19 can be favorably measured.
  • the wall-body flat parts 18b1, 18b7, 19b1, and 19b7 and the end-plate flat parts 18a1, 18a7, 19a1, and 19a7 are within the region of 180°.
  • the region of 180° is not strict, and an angle slightly (for example, about 30°) exceeding 180° is allowed within a range where the fluid leakage does not increase.
  • the slope angle ⁇ of the inclined part is set to be constant in the circumferential direction in which the spiral wall bodies 18b and 19b extend.
  • first wall-body inclined parts 18b4 and 19b4, the first end-plate inclined parts 18a4 and 19a4, the second wall-body inclined parts 18b2, 18b6, 19b2, and 19b6, and the second end-plate inclined parts 18a2, 18a6, 19a2, and 19a6 are provided on both the scrolls 18 and 19, but may be provided on any one of both the scrolls.
  • one wall body for example, the wall body 19b of the orbiting scroll 19
  • the other end plate for example, the end plate 18a of the fixed scroll 18
  • the other wall body 18b and one end plate 19a are flat.
  • the wall-body flat parts 18b1, 18b7, 19b1, and 19b7 and the end-plate flat parts 18a1, 18a7, 19a1, and 19a7 are provided, the flat part on the inner peripheral side and/or the outer peripheral side may not be provided, and the second wall-body inclined parts 18b2 and 19b2 may be provided to extend over the entire wall bodies 18b and 19b.
  • the present invention is applicable to a scroll expander used as an expander.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Rotary Pumps (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)

Claims (10)

  1. Machine hydraulique à spirale comprenant :
    un premier élément de spirale (18) dans lequel un premier corps de paroi (18b) ayant une forme de spirale est prévu sur une première plaque d'extrémité (18a) ; et
    un second élément de spirale (19) dans lequel un second corps de paroi (19b) ayant une forme de spirale est prévu sur une seconde plaque d'extrémité (19a) disposée afin de faire face à la première plaque d'extrémité (18a), le second élément de spirale (19) étant configuré pour réaliser un mouvement relatif de révolution et de rotation de sorte que le second corps de paroi (19b) est engrené avec le premier corps de paroi (18b) pour former un espace scellé (20), caractérisée en ce que :
    après le début du scellement de l'espace scellé, on détermine une première région dans laquelle un changement de volume de l'espace scellé est progressif ou sensiblement constant,
    au moins un corps de paroi parmi le premier corps de paroi (18b) et le second corps de paroi (19b) comprend une première partie inclinée de corps de paroi (18b4) dans laquelle une hauteur du corps de paroi (18b) augmente de manière continue d'un côté périphérique externe à un côté périphérique interne dans une direction de spirale,
    au moins une plaque d'extrémité parmi la première plaque d'extrémité (18a) et la seconde plaque d'extrémité (19a) comprend une première partie inclinée de plaque d'extrémité (18a4) dans laquelle un fond de dent opposé à une pointe de dent de la première partie inclinée de corps de paroi (18b4) est incliné selon une inclinaison de la première partie inclinée de corps de paroi (18b4), et
    au moins une partie de la première région est déterminée par des positions et des formes de la première partie inclinée de corps de paroi (18b4) et de la première partie inclinée de plaque d'extrémité (18a4).
  2. Machine hydraulique à spirale selon la revendication 1, dans laquelle :
    une partie d'alimentation en fluide (26) est prévue sur la première plaque d'extrémité (18a) ou la seconde plaque d'extrémité (19a) pour fournir un fluide ayant une pression supérieure à une pression de fluide dans l'espace scellé, dans l'espace scellé (20), et
    la partie d'alimentation en fluide (26) est prévue dans la première région.
  3. Machine hydraulique à spirale selon la revendication 1 ou 2, dans laquelle :
    une deuxième région dans laquelle un volume de l'espace scellé (20) diminue, est placée devant la première région, et une troisième région dans laquelle le volume de l'espace scellé (20) diminue, est placée derrière la première région.
  4. Machine hydraulique à spirale selon la revendication 3, dans laquelle :
    au moins l'un parmi le premier corps de paroi (18b) et le second corps de paroi (19b) comprend une seconde partie inclinée de corps de paroi (18b2, 18b6) dans laquelle une hauteur du corps de paroi (18b) diminue de manière continue du côté périphérique externe au côté périphérique interne dans la direction de spirale,
    au moins l'un parmi le premier corps de paroi (18b) et le second corps de paroi (19b) comprend une seconde partie inclinée de plaque d'extrémité (18a2, 18a6), dans laquelle le fond de dent opposé à la pointe de dent de la première partie inclinée de corps de paroi (18b4) est inclinée selon une inclinaison de la seconde partie inclinée de corps de paroi (18b2, 18b6), et
    au moins une partie de chacune parmi la deuxième région et la troisième région est déterminée par des positions et des formes de la seconde partie inclinée de corps de paroi (18b2, 18b6) et la seconde partie inclinée de plaque d'extrémité (18a2, 18a6).
  5. Machine hydraulique à spirale selon la revendication 4, dans laquelle :
    une hauteur d'une pointe de dent au niveau d'une extrémité du côté périphérique externe (18b8) de la seconde partie inclinée de corps de paroi (18b2) disposée plus à proximité du côté périphérique externe par rapport à la première partie inclinée de corps de paroi (18b4) est égale à une hauteur d'une pointe de dent au niveau d'une extrémité du côté périphérique interne (18b9) de la première partie inclinée de corps de paroi (18b4).
  6. Machine hydraulique à spirale selon la revendication 4 ou 5, dans laquelle :
    une hauteur d'un fond de dent au niveau d'une extrémité du côté périphérique externe (18a8) de la seconde partie inclinée de plaque d'extrémité (18a2) disposé plus à proximité du côté périphérique externe par rapport à la première partie inclinée de plaque d'extrémité (18a4) est égale à une hauteur d'un fond de dent au niveau d'une extrémité du côté périphérique interne (18a9) de la première partie inclinée de plaque d'extrémité (18a4).
  7. Machine hydraulique à spirale selon l'une quelconque des revendications 1 à 6, dans laquelle :
    des joints d'étanchéité de pointe (28) sont prévus au niveau des pointes de dent du premier corps de paroi (18b) et du second corps de paroi (19b), respectivement, pour sceller le fluide en étant en contact avec les fonds de dent opposés aux pointes de dent.
  8. Machine hydraulique à spirale selon l'une quelconque des revendications 1 à 7, dans laquelle :
    un revêtement est prévu sur au moins un élément parmi les pointes de dent du premier corps de paroi (18b) et du second corps de paroi (19b) et les fonds de dent opposés aux pointes de dent.
  9. Machine hydraulique à spirale selon l'une quelconque des revendications 1 à 8, dans laquelle :
    des parties plates de corps de paroi (18b1, 18b3, 18b5, 19b1, 19b3, 19b5) qui ne changent pas de hauteur, sont prévues sur les parties périphériques les plus à l'extérieur et/ou les parties périphériques le plus à l'intérieur du premier corps de paroi (18b4) et du second corps de paroi (18b2), et
    des parties plates de plaque d'extrémité (18a1, 18a3, 18a5, 19a1, 19a3, 19a5) correspondant aux parties plates de corps de paroi (18b1, 18b3, 18b5, 19b1, 19b3, 19b5) sont prévues sur la première plaque d'extrémité (18a) et la seconde plaque d'extrémité (19a).
  10. Machine hydraulique à spirale selon la revendication 9, dans laquelle :
    les parties plates de corps de paroi (18b1, 18b3, 18b5, 19b1, 19b3, 19b5) et les parties plates de plaque d'extrémité (18a1, 18a3, 18a5, 19a1, 19a3, 19a5) sont prévues sur une région de 180° autour d'un centre du premier élément de spirale (18) ou du second élément de spirale (19).
EP19758318.0A 2018-02-21 2019-02-06 Machine hydraulique à spirale Active EP3751143B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2018028957A JP7134641B2 (ja) 2018-02-21 2018-02-21 スクロール流体機械
PCT/JP2019/004254 WO2019163516A1 (fr) 2018-02-21 2019-02-06 Machine hydraulique à spirale

Publications (3)

Publication Number Publication Date
EP3751143A1 EP3751143A1 (fr) 2020-12-16
EP3751143A4 EP3751143A4 (fr) 2021-04-21
EP3751143B1 true EP3751143B1 (fr) 2022-03-02

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4219947A3 (fr) * 2023-06-15 2024-02-07 Pfeiffer Vacuum Technology AG Pompe à spirales à géométrie hélicoïdale optimisée

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6037320B2 (ja) * 1981-10-12 1985-08-26 サンデン株式会社 スクロ−ル型圧縮機
JP3881861B2 (ja) * 2001-02-02 2007-02-14 三菱重工業株式会社 スクロール圧縮機
JP4754869B2 (ja) 2005-05-09 2011-08-24 三菱重工業株式会社 スクロール型圧縮機および冷凍サイクル
JP4576306B2 (ja) * 2005-08-29 2010-11-04 三菱重工業株式会社 スクロール圧縮機および空気調和機
JP2010196663A (ja) 2009-02-26 2010-09-09 Mitsubishi Heavy Ind Ltd 圧縮機
GB0912162D0 (en) * 2009-07-14 2009-08-26 Edwards Ltd Scroll compressor
CN204003446U (zh) 2014-06-04 2014-12-10 恒升精密科技股份有限公司 压缩机涡卷

Also Published As

Publication number Publication date
EP3751143A1 (fr) 2020-12-16
WO2019163516A1 (fr) 2019-08-29
JP2019143548A (ja) 2019-08-29
EP3751143A4 (fr) 2021-04-21
JP7134641B2 (ja) 2022-09-12

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