WO2019163537A1 - Machine à volutes pour fluide - Google Patents

Machine à volutes pour fluide Download PDF

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Publication number
WO2019163537A1
WO2019163537A1 PCT/JP2019/004465 JP2019004465W WO2019163537A1 WO 2019163537 A1 WO2019163537 A1 WO 2019163537A1 JP 2019004465 W JP2019004465 W JP 2019004465W WO 2019163537 A1 WO2019163537 A1 WO 2019163537A1
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WO
WIPO (PCT)
Prior art keywords
end plate
wall body
wall
region
scroll
Prior art date
Application number
PCT/JP2019/004465
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English (en)
Japanese (ja)
Inventor
創 佐藤
陽平 堀田
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.)
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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
Publication of WO2019163537A1 publication Critical patent/WO2019163537A1/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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
    • F04C29/02—Lubrication; Lubricant separation
    • 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

Definitions

  • the present invention relates to a scroll fluid machine.
  • a scroll fluid machine that compresses or expands a fluid by meshing a fixed scroll member provided with a spiral wall body in an end plate shape and a orbiting scroll member and performing a revolving orbiting motion.
  • a scroll compressor is a device that compresses a refrigerant circulating in a refrigeration cycle applied to, for example, an air conditioner.
  • a two-stage compression refrigeration cycle that compresses the refrigerant in two stages may be used in order to improve the capacity of the heat pump or COP (coefficient of performance).
  • an economizer gas-liquid separator
  • This refrigeration cycle is also called a gas injection cycle or an economizer cycle.
  • a compressor structure In order to realize the above-described two-stage compression refrigeration cycle, one of the following three types is required as a compressor structure. (1) In a two-stage compressor in which a high-stage compressor and a low-stage compressor are accommodated in a single compressor, an intermediate pressure is applied between the discharge side of the low-stage compressor and the suction side of the high-stage compressor. Introduce refrigerant. (2) Two single-stage compressors having only one compressor are connected in series, and an intermediate-pressure refrigerant is introduced between the discharge side of the low-stage compressor and the suction side of the high-stage compressor. (3) In a single-stage compressor having only one compression section, an intermediate pressure refrigerant is introduced during the compression process of the compression section.
  • a wall stepped portion is formed at the upper edge of the wall of the scroll compressor, and the wall has a higher portion on the center side in the spiral direction than the wall stepped portion.
  • a low portion having a low height is formed on the outer peripheral end side.
  • An end plate stepped portion is formed on one side surface of the end plate on which the wall body is erected.
  • a high surface portion is formed.
  • the end plate stepped portion is formed at a position facing the wall body stepped portion.
  • a fluid supply part (injection port) for supplying a fluid having a pressure higher than the fluid pressure in the compression chamber to the compression chamber is provided in a region near the end plate stepped portion in the low surface portion.
  • Patent Document 1 it is set as a section in which the rate of decrease in the volume of the compression chamber is moderate or a section in which the volume increases from when the compression chamber starts to be sealed by turning the orbiting scroll member (at the time of suction closing).
  • the interval to the section is short. For this reason, since the refrigerant is introduced into the compression chamber, the pressure in the compression chamber increases to an intermediate pressure (injection pressure) at an early stage, and therefore, the period of time during which compression is performed with the pressure after introduction becomes long, and wasteful compression power is generated.
  • the wall stepped part and the end plate stepped part as the boundary, the low part and the high part, or the high part and the bottom part are switched from the outer peripheral end side to the center side in the spiral direction, so the change in volume is Only the height and position of the step are adjusted. Therefore, it is difficult to provide a section in which the volume is substantially constant, and the degree of freedom is low when setting the turning angle range of the section in which the volume is substantially constant.
  • This invention is made in view of such a situation, Comprising: It aims at providing the scroll fluid machine which can introduce
  • a scroll fluid machine of the present invention employs the following means. That is, a scroll fluid machine according to an aspect of the present invention includes a first scroll member having a spiral first wall provided on a first end plate, and a first scroll member disposed so as to face the first end plate.
  • a second scroll member that is provided with a spiral second wall on the two end plates, and that relatively revolves so that the second wall engages with the first wall to form a sealed space; After the sealing of the sealed space is started, a first region in which the volume change of the sealed space becomes gentle or substantially constant is set, and at least one of the first end plate and the second end plate is
  • the first wall body and the second wall body have a first wall body inclined portion in which the height of the wall body continuously increases from the outer peripheral side to the inner peripheral side in the spiral direction, and at least one of the first wall body and the second wall body is The tooth bottom surface facing the tooth tip of the first wall inclined portion is inclined according to the inclination of the first wall inclined portion.
  • a first end plate inclined portion, and at least a part of the first region is set by the position and shape of the first wall inclined portion and the first end plate inclined portion, and the first wall inclined portion Or the first end plate inclined portion is provided over a region of 20 ° or more around the center of the first scroll member or the second scroll member.
  • the first scroll member and the second scroll member relatively revolve and rotate, and the second wall body meshes with the first wall body to form a sealed space. Then, after the sealed space is started to be sealed by the revolving and turning motion, a first region is set in which the volume change of the sealed space becomes gentle or substantially constant.
  • the height of the wall body in the first wall inclined portion continuously increases from the outer peripheral side to the inner peripheral side in the spiral direction, and faces the tooth tip of the first wall inclined portion in the first end plate inclined portion.
  • the tooth bottom surface to be inclined is inclined according to the inclination of the first wall inclined portion.
  • the height of the wall body is continuously increased, and fluid leakage can be reduced as compared with the conventional scroll fluid machine with a step provided on the wall body and the tooth bottom. .
  • the slopes of the first wall slope part and the first end plate slope part are not limited to smoothly connected slopes, but small steps are connected in a staircase pattern, and the first wall slope part is entirely If it sees, what is inclined continuously is included.
  • a 1st wall body inclination part and a 1st end plate inclination part may be provided in the both sides of a 1st scroll member and a 2nd scroll member, and may be provided in any one.
  • the first wall body inclined portion is provided on one wall body and the first end plate inclined portion is provided on the other end plate, the other wall body and one end plate may be flat, A shape combined with a stepped shape may be used.
  • the said 1st wall body inclination part or the said 1st end plate inclination part may be provided over the area
  • the first end plate or the second end plate is provided with a fluid supply unit that supplies a fluid having a pressure higher than the fluid pressure in the sealed space to the sealed space, and the fluid supply A part may be provided in the first region.
  • the fluid supply unit is provided in the first end plate or the second end plate, and the fluid supply unit supplies a fluid having a pressure higher than the fluid pressure in the sealed space into the sealed space.
  • the fluid supply unit since the fluid supply unit is provided in the first region where the volume change of the sealed space is gradual or substantially constant, the pressure difference between the fluid supplied and the pressure increase in the sealed space is gradual or substantially constant.
  • the fluid can be supplied to the sealed space while maintaining a predetermined value or more.
  • a second region in which the volume of the sealed space decreases before the first region and a third region in which the volume of the sealed space decreases after the first region are set. Good.
  • the second region in which the volume of the sealed space decreases is set in front of the first region, whereby the second region in front of the first region is set.
  • the pressure in the sealed space increases.
  • the fluid whose pressure has increased is maintained at a substantially constant pressure in the sealed space as it moves toward the inner peripheral side.
  • At least one of the said 1st wall body and the said 2nd wall body is the 2nd wall from which the height of this wall body reduces continuously toward the inner peripheral side from the outer peripheral side of a spiral direction
  • a body inclined portion, and at least one of the first wall body and the second wall body has a tooth bottom surface that faces a tooth tip of the first wall body inclined portion according to the inclination of the second wall body inclined portion.
  • a second end plate inclined portion that inclines, and at least a part of each of the second region and the third region depends on the position and shape of the second wall body inclined portion and the second end plate inclined portion. It may be set.
  • the height of the wall body in the second wall body inclined portion decreases from the outer peripheral side toward the inner peripheral side, and the second end plate inclined portion faces the tooth tip of the second wall body inclined portion.
  • the tooth bottom surface to be inclined is inclined according to the inclination of the second wall inclined portion. Therefore, at least a part of each of the second region and the third region in which the volume of the sealed space decreases is set according to the positions and shapes of the second wall body inclined portion and the second end plate inclined portion.
  • the fluid sucked from the outer peripheral side is not only compressed by the reduction of the width of the sealed space according to the spiral shape of the wall body, but also the height of the sealed space, that is, the end as it goes to the inner peripheral side. Further compression is achieved by reducing the distance between the opposing surfaces of the plates. As a result, three-dimensional compression is possible, and downsizing can be realized.
  • the intermediate-pressure refrigerant can be reliably introduced during the compression process or the expansion process, and the pressure in the sealed space can be further increased.
  • the rise can be suppressed.
  • the compressor efficiency can be improved.
  • the height of the wall is continuously increased, and fluid leakage can be reduced as compared with a conventional scroll fluid machine having a step provided on the wall and the tooth bottom.
  • FIG. 1 It is a block diagram which shows the refrigerating cycle which concerns on one Embodiment of this invention. It is a fragmentary longitudinal cross-section which shows the principal part of the scroll compressor which concerns on one Embodiment of this invention. It is a longitudinal cross-sectional view which shows the fixed scroll of the scroll compressor which concerns on one Embodiment of this invention, and is the III-III arrow directional view of FIG. It is a top view which shows the fixed scroll which concerns on one Embodiment of this invention. It is a top view which shows the tooth tip and end plate of the wall body of the fixed scroll which concern on one Embodiment of this invention.
  • the refrigeration cycle 10 has a scroll compressor 1 that compresses refrigerant (fluid), a condenser 2 that radiates heat of the compressed refrigerant to the outside, and decompresses the refrigerant that has flowed out of the condenser 2.
  • a first expansion valve 3 provided on the high-pressure side, an economizer (gas-liquid separator) 4 that separates the decompressed refrigerant into liquid refrigerant and gas refrigerant, and a second provided on the low-pressure side that further depressurizes the liquid refrigerant.
  • An expansion valve 5, an evaporator 6 that absorbs heat by the decompressed refrigerant, an injection flow path 7 that guides the gas refrigerant from the economizer 4 to the scroll compressor 1, and the like are provided.
  • the scroll compressor 1 is a hermetic compressor, and as illustrated in FIG. 2, a scroll 11 that compresses a housing 11 having a sealed space therein and a refrigerant that is disposed in the housing 11 and is taken into the sealed space.
  • the main elements are a mechanism 12, a rotating shaft that transmits a rotational force to the scroll compression mechanism 12, and an electric motor that orbits the revolving scroll 19 of the scroll compression mechanism 12 via the rotating shaft.
  • the housing 11 is sealed at the bottom by a lower cover, and is provided with a cylindrical intermediate cover 13 that is long in the vertical direction at the top of the lower cover.
  • a discharge cover 14 and an upper cover 15 are provided on the upper portion of the intermediate cover 13, and the housing 11 is hermetically sealed.
  • a discharge of compressed high-pressure gas is discharged between the discharge cover 14 and the upper cover 15.
  • a chamber 16 is formed.
  • a scroll compression mechanism 12 is incorporated in the housing 11, and an electric motor including a stator and a rotor is installed below the scroll compression mechanism 12.
  • the electric motor is incorporated by fixing the stator to the housing 11, and the rotating shaft is fixed to the rotor.
  • the scroll compression mechanism 12 includes a fixed scroll 18 fixedly installed on the housing 11, a slidably supported, and a revolving scroll 19 that forms a compression chamber 20 by being engaged with the fixed scroll 18.
  • a suction port (not shown) for sucking refrigerant is formed on the side surface of the housing 11 so as to communicate with the sealed space, and the top cover 15 communicates with the discharge chamber 16 and compressed on the top side.
  • a discharge port 15a is formed through which the discharged refrigerant gas is discharged.
  • the scroll compression mechanism 12 sucks the refrigerant gas sucked into the housing 11 through the suction pipe and the suction port into the compression chamber 20 through the suction port 21 on the outer peripheral side opened to the inside of the housing 11 and compresses the refrigerant gas. To do.
  • the compressed refrigerant gas is discharged into the discharge chamber 16 through the discharge port 22 provided in the center of the fixed scroll 18 and the discharge port 23 provided in the discharge cover 14, and further to the upper cover 15. It is provided and sent out of the compressor via a discharge pipe 24 communicating with the discharge chamber 16.
  • the discharge cover 14 is provided with an injection pipe 25 through which the intermediate pressure refrigerant is introduced from the outside into the compression chamber 20 of the scroll compression mechanism 12 through the upper cover 15.
  • a refrigerant is supplied to the compression chamber 20 via the injection pipe 25 and the injection port (fluid supply part) 26.
  • the reed valve 27 is a thin plate member and is provided at the outlet of the discharge port 22 to open and close the discharge port 22.
  • the reed valve 27 regulates the flow of the refrigerant in only one direction. By providing the reed valve 27, the refrigerant flows from the compression chamber 20 to the discharge chamber 16 side.
  • the fixed scroll 18 includes a substantially disc-shaped end plate (first end plate) 18 a and a spiral wall body (first plate) standing on one side surface of the end plate 18 a. 1 wall) 18b.
  • the orbiting scroll 19 includes a substantially disc-shaped end plate (second end plate) 19 a and a spiral wall body (first plate) erected on one side surface of the end plate 19 a. 2 walls) 19b.
  • the spiral shape of each wall 18b, 19b is defined using, for example, an involute curve or an Archimedean curve.
  • the fixed scroll 18 and the orbiting scroll 19 are meshed with their centers O1 and O2 separated by the orbiting radius ⁇ and the phases of the wall bodies 18b and 19b shifted by 180 °, and the tooth tips of the wall bodies 18b and 19b of the scrolls 18 and 19 are engaged. And the tooth bottom are assembled so as to have a slight height clearance (chip clearance) at room temperature. Accordingly, a plurality of pairs of compression chambers 20 formed between the scrolls 18 and 19 and surrounded by the end plates 18a and 19a and the wall bodies 18b and 19b are formed symmetrically with respect to the scroll center.
  • the orbiting scroll 19 revolves around the fixed scroll 18 by a rotation prevention mechanism such as an Oldham ring (not shown).
  • the distance L between the opposed surfaces 18 a and 19 a facing each other is continuously decreased or increased from the outer peripheral side to the inner peripheral side of the spiral wall bodies 18 b and 19 b.
  • the inclination of the tooth tips in the wall bodies 18b and 19b and the inclination of the tooth bottom surface in the end plates 18a and 19a are set.
  • the wall body 18 b of the fixed scroll 18 has a wall body flat part 18 b 1, a second wall body inclined part 18 b 2, and a wall body flat part from the outer peripheral side toward the inner peripheral side.
  • a portion 18b3, a first wall body inclined portion 18b4, a wall body flat portion 18b5, a second wall body inclined portion 18b6, and a wall body flat portion 18b7 are provided in this order.
  • the bottom surface of the fixed scroll 18 has an end plate flat portion 18 a 1, a second end plate inclined portion 18 a 2, and an end plate flat portion from the outer peripheral side toward the inner peripheral side.
  • 18a3, first end plate inclined portion 18a4, end plate flat portion 18a5, second end plate inclined portion 18a6, and end plate flat portion 18a7 are provided in this order.
  • the wall body 19 b of the orbiting scroll 19 has a wall body flat part 19 b 1, a second wall body inclined part 19 b 2, and a wall body flat part from the outer peripheral side toward the inner peripheral side.
  • a portion 19b3, a first wall body inclined portion 19b4, a wall body flat portion 19b5, a second wall body inclined portion 19b6, and a wall body flat portion 19b7 are provided in this order.
  • the end plate flat portion 19 a 1, the second end plate inclined portion 19 a 2, and the end plate flat portion are formed on the tooth bottom surface of the orbiting scroll 19 from the outer peripheral side toward the inner peripheral side.
  • 19a3, a first end plate inclined portion 19a4, an end plate flat portion 19a5, a second end plate inclined portion 19a6, and an end plate flat portion 19a7 are provided in this order.
  • the wall flat portions 19b1, 19b3, 19b5, 19b7 provided on the wall 19b of the orbiting scroll 19 have a constant height from the outer peripheral side toward the inner peripheral side. That is, the dimension in the axial direction passing through the center O2 (see FIG. 2) of the orbiting scroll 19 is constant.
  • the height of the wall body and the tooth bottom means the dimension in the axial direction passing through the centers O1 and O2.
  • wall body flat portions 19b1 and 19b7 having a constant height are provided on the outermost and innermost sides of the wall body 19b of the orbiting scroll 19, respectively. . As shown in FIG. 8, these wall body flat portions 19b1 and 19b7 cover a region of 180 ° (for example, 180 ° to 360 °, preferably 210 ° or less) around the center O2 (see FIG. 2) of the orbiting scroll 19. Is provided.
  • end plate flat portions 19a1 and 19a7 having a constant height.
  • the end plate flat portions 19a1 and 19a7 are also provided over a region of 180 ° (for example, 180 ° to 360 °, preferably 210 ° or less) around the center O2 of the orbiting scroll 19.
  • the fixed scroll 18 is also provided with wall body flat portions 18 b 1 and 18 b 7 and end plate flat portions 18 a 1 and 18 a 7, similarly to the orbiting scroll 19.
  • the wall flat portions 18b1 and 18b7 and the end plate flat portions 18a1 and 18a7 are also provided over a region of 180 ° (for example, 180 ° to 360 °, preferably 210 ° or less) around the center O1 of the fixed scroll 18. .
  • the height of the first wall inclined portion 19b4 provided on the wall 19b of the orbiting scroll 19 increases continuously from the outer peripheral side toward the inner peripheral side.
  • the tooth bottom surface on the end plate 18a of the fixed scroll 18 where the tooth tips of the first wall inclined portion 19b4 face each other is inclined according to the inclination of the first wall inclined portion 19b4.
  • One end plate inclined portion 18a4 is provided.
  • the first wall inclined portion 18b4 provided on the wall 18b of the fixed scroll 18 also increases continuously from the outer peripheral side toward the inner peripheral side, as shown in FIG.
  • a first end plate inclined portion inclined according to the inclination of the first wall inclined portion 18b4. 19a4 is provided.
  • the lengths in the spiral direction of the first wall inclined portions 18b4 and 19b4 and the first end plate inclined portions 18a4 and 19a4 are set to be equivalent to 20 ° or more, preferably 180 ° or more around the centers O1 and O2. .
  • the length in the spiral direction of the first wall body inclined portions 18b4 and 19b4 and the first end plate inclined portions 18a4 and 19a4 may be a length corresponding to around 360 ° around the centers O1 and O2.
  • the width of the compression chamber 20 decreases according to the spiral shape of the wall bodies 18b and 19b, and the height of the compression chamber 20, that is, the facing between the end plates 18a and 19a.
  • the distance between surfaces increases. Therefore, the volume change of the compression chamber 20 is moderate or slow depending on the position and shape of the first wall body inclined portions 18b4 and 19b4 and the first end plate inclined portions 18a4 and 19a4 in the spiral direction (for example, the inclination angle and the length in the spiral direction).
  • At least a part of the first region that is substantially constant is set. As the fluid sucked in from the suction port 21 on the outer peripheral side moves toward the inner peripheral side, the pressure in the compression chamber 20 is maintained substantially constant in the first region.
  • the first region may be set by providing only one first wall inclined portion 18b4, 19b4 or first end plate inclined portion 18a4, 19a4 over the spiral direction, or a plurality of first wall inclined portions
  • the portions 18b4 and 19b4 or the first end plate inclined portions 18a4 and 19a4 may be set in series.
  • the respective inclination angles are different, or the wall body flat portion or the end plate flat portion is interposed therebetween. It is realized by providing.
  • the end plate 18 a of the fixed scroll 18 is provided with an injection port 26 that supplies a refrigerant having a pressure higher than the fluid pressure in the compression chamber 20 into the compression chamber 20.
  • an injection port 26 that supplies a refrigerant having a pressure higher than the fluid pressure in the compression chamber 20 into the compression chamber 20.
  • the refrigerant can be supplied to the compression chamber 20 while maintaining the pressure difference with the refrigerant supplied from the injection port 26 at a predetermined level or more in a process in which the pressure change in the compression chamber 20 is moderate or substantially constant.
  • an intermediate pressure refrigerant injection step is performed.
  • the injection port 26 is repeatedly opened and closed (communication and non-communication) according to the period (360 ° period) of the revolving orbiting motion of the orbiting scroll 19.
  • the period in which the compression chamber 20 and the injection port 26 communicate with each other is a period obtained by excluding the period in which the compression chamber 20 and the injection port 26 do not communicate with each other from the period of the revolution turning motion, and is less than 360 °.
  • the section where the compression chamber 20 and the injection port 26 communicate with each other is desirably a first region where the volume change of the compression chamber 20 is moderate or substantially constant.
  • first wall inclined portions 18b4, 19b4 and the first end plate inclined portions 18a4, 19a4 can be set.
  • the height of the second wall body inclined portions 19b2 and 19b6 provided on the wall body 19b of the orbiting scroll 19 decreases continuously from the outer peripheral side toward the inner peripheral side.
  • Inclined portions 18a2 and 18a6 are provided.
  • the second wall body inclined portions 18b2 and 18b6 provided on the wall body 18b of the fixed scroll 18 also continuously decrease from the outer peripheral side toward the inner peripheral side, and the second wall body inclined portions 18b2 and 18b6.
  • Second end plate inclined portions 19a2 and 19a6 that are inclined in accordance with the inclination of the second wall body inclined portions 18b2 and 18b6 are provided on the tooth bottom surface of the end plate 19a of the orbiting scroll 19 that faces the tooth tips. .
  • the width of the compression chamber 20 decreases according to the spiral shape of the wall bodies 18b and 19b, and the height of the compression chamber 20, that is, the facing between the end plates 18a and 19a.
  • the distance between surfaces decreases. Therefore, the second wall body inclined portions 18b2, 18b6, 19b2, 19b6 and the second end plate inclined portions 18a2, 18a6, 19a2, 19a6 are compressed depending on the positions and shapes (for example, the inclination angle and the length in the spiral direction) of the second end plate inclined portions At least a part of each of the second region and the third region in which the volume of the chamber 20 decreases is set.
  • the refrigerant sucked from the suction port 21 on the outer peripheral side goes toward the inner peripheral side, the refrigerant is not only compressed by the reduction in the width of the compression chamber 20 according to the spiral shape of the wall bodies 18b and 19b, but also the compression chamber 20 Further compression is caused by a decrease in height, that is, a distance between the opposing surfaces between the end plates 18a and 19a. As a result, three-dimensional compression is possible, and downsizing can be realized.
  • the second region in which the volume of the compression chamber 20 decreases is set in front of the first region in the movement direction of the compression chamber 20 associated with the revolving orbiting motion of the orbiting scroll 19, and the third region is in the movement direction of the compression chamber 20. It is set after the first area.
  • the second region is a region from when the wall bodies 18b and 19b are engaged with each other on the outer peripheral side to form the compression chamber 20 and shut down until the first region starts.
  • the third region is a region from the end of the first region to the end of discharge of the compressed refrigerant from the discharge port 22.
  • a two-stage compression refrigeration cycle is realized in which the refrigerant is introduced into the middle of the compression process of the scroll compression mechanism 12 from the economizer 4 through the injection flow path 7 and the injection port 26.
  • a single stage provided with only one scroll compression mechanism 12 is provided between the second area and the third area where the volume of the compression chamber 20 decreases, and a first area in which the volume change of the compression chamber 20 is moderately or substantially constant is provided.
  • intermediate pressure refrigerant can be introduced from the economizer 4 during the compression process of the scroll compression mechanism 12.
  • 19a6 is not limited to smoothly connected slopes, but small steps that are unavoidably produced during machining or additive manufacturing (AM) are connected stepwise.
  • AM additive manufacturing
  • the inclined portion as a whole is viewed, the one that is continuously inclined is also included. However, large steps such as so-called stepped scrolls are not included.
  • a coating may be applied.
  • the coating include manganese phosphate treatment and nickel phosphorus plating.
  • the tooth tip heights at the outer peripheral side end portions 18b8 and 19b8 of the second wall inclined portions 18b2 and 19b2 arranged on the outer peripheral side with respect to the first wall inclined portions 18b4 and 19b4 are as follows.
  • the tooth tip heights at the inner peripheral side end portions 18b9 and 19b9 of the first wall body inclined portions 18b4 and 19b4 may be the same.
  • measurement can be performed at one end 18b8, 19b8 and the other end 18b9, 19b9 with the first wall inclined portions 18b4, 19b4 and the second wall inclined portions 18b2, 19b2 interposed therebetween.
  • the dimension measurement of the fixed scroll 18 or the orbiting scroll 19 can be suitably performed.
  • 19a8 may be the same as the bottom surface height at the inner peripheral side end portions 18a9, 19a9 of the first end plate inclined portions 18a4, 19a4.
  • a tip seal is provided at the tooth tip of the wall 18 b of the fixed scroll 18.
  • the tip seal is made of resin and seals the fluid by contacting the tooth bottom of the end plate 19a of the orbiting scroll 19 facing the tip seal.
  • the tip seal is accommodated in a tip seal groove 18d formed in the tooth tip of the wall 18b over the circumferential direction.
  • a tip seal groove 19d is formed on the tooth tip of the wall 19b of the orbiting scroll 19, and a tip seal is provided in the tip seal groove 19d.
  • FIG. 11A shows that the tip clearance T is small
  • FIG. 11B shows that the tip clearance T is large. Even if the tip clearance T changes due to the turning motion, the tip seal 28 is pressed from the back to the tooth bottom side of the end plate 19a by the compressed fluid, so that it can be followed and sealed.
  • 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 shown).
  • a driving source such as an electric motor (not shown).
  • the fluid is sucked from the outer peripheral side 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 as it moves from the outer peripheral side to the inner peripheral side in the second region. Then, as shown in FIG. 12, the pressure in the compression chamber 20 increases. The compressed refrigerant moves to the first region, and in the first region, the refrigerant moves toward the inner peripheral side. Then, an intermediate pressure refrigerant is supplied from the economizer 4 to the compression chamber 20 via the injection pipe 25 and the injection port (fluid supply unit) 26. In the first region, as shown in FIG. 12, the pressure change in the compression chamber 20 is moderate or substantially constant, and the fluid is supplied to the compression chamber while maintaining the pressure difference with the refrigerant supplied from the economizer 4 at a predetermined level or more. 20 can be supplied.
  • the refrigerant moves to the third region, and in the third region, the refrigerant is compressed as it goes to the inner peripheral side, and the pressure in the compression chamber 20 rises again as shown in FIG.
  • the compressed refrigerant is finally discharged from the discharge port 22 formed in the fixed scroll 18.
  • the scroll compressor 1 of this embodiment there exist the following effects. Since the slope between the opposing surfaces of the end plates 18a, 19a is continuously reduced from the outer peripheral side to the inner peripheral side of the wall bodies 18b, 19b, three-dimensional compression is possible, and miniaturization is achieved. Can be realized.
  • the sealing of the compression chamber 20 is started.
  • a first region in which the volume change of the compression chamber 20 is gradual or substantially constant is set. Since the injection port 26 is provided in the first region, the refrigerant is supplied to the compression chamber while maintaining the pressure difference with the supplied refrigerant at a predetermined level or higher while the pressure change in the compression chamber 20 is moderate or substantially constant. 20 can be reliably supplied.
  • the inclined portion is continuously increased or decreased, and fluid leakage can be reduced as compared with the conventional scroll fluid machine with a step provided on the wall body and the tooth bottom.
  • the tip seals 28 are provided at the tooth tips of the wall bodies 18b and 19b, the tip clearance T (see FIGS. 11A and 11B) between the tooth tips and the tooth bottom in the inclined portion changes according to the turning motion.
  • the tip seal can be made to follow, and fluid leakage can be suppressed.
  • the walls 18b and 19b and / or the end plates 18a and 19a are coated. As a result, it is possible to compensate for the machining variation of the inclined portion where it is difficult to obtain machining accuracy with the film thickness of the coating, and to further suppress fluid leakage.
  • the wall body flat portions 18b1, 18b7, 19b1, 19b7 and the end plate flat portions 18a1, 18a7, 19a1, 19a7 are provided on the outermost and innermost peripheral portions of the wall bodies 18b, 19b and the end plates 18a, 19a.
  • the flat portions 18b1, 18b7, 19b1, 19b7 and the end plate flat portions 18a1, 18a7, 19a1, 19a7 can be made.
  • the shape dimension of the fixed scroll 18 or the turning scroll 19 can be performed suitably. If the range of the flat part greatly exceeds 180 °, the area of the inclined part decreases and the inclination ⁇ of the inclined part increases. When the inclination ⁇ increases, the amount of change in the tip clearance T due to the turning diameter during the revolving turning motion increases, and there is a risk that fluid leakage will increase.
  • the wall body flat portions 18b1, 18b7, 19b1, 19b7 and the end plate flat portions 18a1, 18a7, 19a1, 19a7 are defined as 180 ° regions. However, this 180 ° is not strict, and an angle slightly exceeding 180 ° (for example, about 30 °) is allowed within a range where fluid leakage does not increase.
  • the inclination ⁇ of the inclined portion is made constant with respect to the circumferential direction in which the spiral wall bodies 18b and 19b extend. Thereby, the tip clearance T resulting from the turning diameter during the revolution turning motion can be made equal at each position of the inclined portion, and fluid leakage can be suppressed.
  • first wall body inclined portions 18b4, 19b4, the first end plate inclined portions 18a4, 19a4, the second wall body inclined portions 18b2, 18b6, 19b2, 19b6, and the second end plate inclined portions 18a2, 18a6, 19a2 are used.
  • 19a6 are provided on both scrolls 18, 19, but may be provided on either one of them.
  • the first wall body inclined portion 19b4 and the second wall body inclined portions 19b2 and 19b6 are provided on one wall body (for example, the wall body 19b of the orbiting scroll 19), and the other end plate (for example, the fixed scroll 18 of the fixed scroll 18).
  • the other wall body 18b and the one end plate 19a are flat.
  • the shape combined with the conventional stepped shape that is, the end plate 18a of the fixed scroll 18 is provided with the first end plate inclined portion 18a4 and the second end plate inclined portions 18a2, 18a6, while the end plate 19a of the orbiting scroll 19 is provided with the end plate 19a. You may combine with the shape in which the step part was provided.
  • the wall flat portions 18b1, 18b7, 19b1, 19b7 and the end plate flat portions 18a1, 18a7, 19a1, 19a7 are provided, but the inner peripheral side and / or the outer peripheral side flat portions are omitted. You may make it provide the 2nd wall body inclination part 18b2, 19b2 extending in the whole wall body 18b, 19b.
  • the present embodiment has been described as a scroll compressor, the present invention can also be applied to a scroll expander used as an expander.

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

Abstract

Le présent compresseur (1) à volutes comporte une volute fixe (18) et une volute (19) en mouvement orbital. Une première région est configurée, dans laquelle, après que le confinement d'une chambre (20) de compression a commencé, une variation de capacité de la chambre (20) de compression devient graduelle ou approximativement constante. Une paroi (18b) et une paroi (19b) comportent une section inclinée de première paroi dans laquelle la hauteur des parois (18b), (19b) augmente continûment du côté périphérique extérieur vers le côté périphérique intérieur dans la direction de la spirale. Des plaques (18a), (19a) d'extrémités comportent une section inclinée de première plaque d'extrémité dans laquelle une surface de fond de dent opposée à la pointe de dent de la section inclinée de première paroi est inclinée selon l'inclinaison de ladite section inclinée de première paroi, et au moins une partie de la première région est configurée par la position et la forme de la section inclinée de première paroi et de la section inclinée de première paroi. La section inclinée de première paroi ou la section inclinée de première plaque d'extrémité est réalisée à travers une région d'au moins 20° autour du centre de la volute fixe (18) ou de la volute (19) en mouvement orbital.
PCT/JP2019/004465 2018-02-21 2019-02-07 Machine à volutes pour fluide WO2019163537A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2018-028953 2018-02-21
JP2018028953A JP7023739B2 (ja) 2018-02-21 2018-02-21 スクロール流体機械

Publications (1)

Publication Number Publication Date
WO2019163537A1 true WO2019163537A1 (fr) 2019-08-29

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JP (1) JP7023739B2 (fr)
WO (1) WO2019163537A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002303281A (ja) * 2001-02-02 2002-10-18 Mitsubishi Heavy Ind Ltd スクロール圧縮機
JP2006312898A (ja) * 2005-05-09 2006-11-16 Mitsubishi Heavy Ind Ltd スクロール型圧縮機および冷凍サイクル
JP2007064005A (ja) * 2005-08-29 2007-03-15 Mitsubishi Heavy Ind Ltd スクロール圧縮機および空気調和機
JP2012533028A (ja) * 2009-07-14 2012-12-20 エドワーズ リミテッド スクロール圧縮機
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

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002303281A (ja) * 2001-02-02 2002-10-18 Mitsubishi Heavy Ind Ltd スクロール圧縮機
JP2006312898A (ja) * 2005-05-09 2006-11-16 Mitsubishi Heavy Ind Ltd スクロール型圧縮機および冷凍サイクル
JP2007064005A (ja) * 2005-08-29 2007-03-15 Mitsubishi Heavy Ind Ltd スクロール圧縮機および空気調和機
JP2012533028A (ja) * 2009-07-14 2012-12-20 エドワーズ リミテッド スクロール圧縮機
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

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JP7023739B2 (ja) 2022-02-22

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