WO2018043329A1 - Compresseur à spirale - Google Patents

Compresseur à spirale Download PDF

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Publication number
WO2018043329A1
WO2018043329A1 PCT/JP2017/030535 JP2017030535W WO2018043329A1 WO 2018043329 A1 WO2018043329 A1 WO 2018043329A1 JP 2017030535 W JP2017030535 W JP 2017030535W WO 2018043329 A1 WO2018043329 A1 WO 2018043329A1
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WO
WIPO (PCT)
Prior art keywords
scroll
space
refrigerant
housing
scroll compressor
Prior art date
Application number
PCT/JP2017/030535
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English (en)
Japanese (ja)
Inventor
義信 除補
永生 趙
Original Assignee
ダイキン工業株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by ダイキン工業株式会社 filed Critical ダイキン工業株式会社
Priority to CN201780052729.5A priority Critical patent/CN109642572B/zh
Publication of WO2018043329A1 publication Critical patent/WO2018043329A1/fr

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
    • F04C18/02—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents

Definitions

  • the present invention relates to a scroll compressor.
  • a low-pressure dome type scroll compressor in which the inside of a casing is mainly filled with a low-pressure gas refrigerant has been used.
  • a compressor having a relief valve for allowing the refrigerant in the compression chamber to escape to the discharge chamber when the refrigerant in the compression chamber becomes higher than the pressure in the discharge chamber is known (for example, Patent Document 1 (Japanese Patent Laid-Open No. 2013-167215).
  • An object of the present invention is to provide a scroll compressor having high compression efficiency.
  • a scroll compressor includes a casing, a scroll compression mechanism, a housing, a pressing structure, a backflow prevention mechanism, and a lead-out passage.
  • the casing is partitioned into a first space and a second space.
  • the scroll compression mechanism has a movable scroll that forms a compression chamber in combination with a fixed scroll and a fixed scroll.
  • the scroll compression mechanism compresses the refrigerant sucked from the first space in the compression chamber and discharges it to the second space.
  • the housing is attached inside the first space and is used to support the movable scroll.
  • the pressing structure presses the movable scroll against the fixed scroll using one or both of the intermediate refrigerant being compressed in the compression chamber and the compressed refrigerant compressed in the compression chamber.
  • the backflow prevention mechanism is provided in the second space and prevents backflow of the compressed refrigerant.
  • the lead-out passage takes out one or both of the intermediate refrigerant and the compressed refrigerant from the upstream side of the backflow prevention mechanism and guides it to the pressing structure.
  • the intermediate refrigerant and / or the compressed refrigerant is extracted from the upstream side of the backflow prevention mechanism and led out to the pressing structure, and the pressing structure moves the movable scroll from the first space (low pressure space) side. Press against fixed scroll. As a result, separation of the movable scroll and the fixed scroll is prevented, and a highly efficient scroll compressor can be provided.
  • the scroll compressor according to the second aspect of the present invention is the scroll compressor according to the first aspect, wherein the backflow prevention mechanism is a check valve provided at the discharge port of the fixed scroll. Further, the inlet of the outlet passage is formed in the fixed scroll.
  • the intermediate refrigerant and / or the compressed refrigerant are taken out from the upstream side of the check valve provided in the scroll compression mechanism, and led out to the pressing structure via the fixed scroll. Therefore, in the scroll compressor of the present invention, when the operation is stopped, the compressed refrigerant compressed in the compression chamber is led to the first space before being discharged to the second space. Therefore, the present invention has a structure capable of suppressing the differential pressure between the first space and the second space. Thereby, a highly reliable scroll compressor can be provided.
  • the scroll compressor according to the third aspect of the present invention is the scroll compressor according to the first aspect or the second aspect, and further includes a discharge pipe for discharging the refrigerant discharged from the compression chamber.
  • the backflow prevention mechanism is a check valve provided in the discharge pipe.
  • the outlet passage is formed with an inflow port in the fixed scroll.
  • the intermediate refrigerant and / or the compressed refrigerant is taken out from the upstream side of the check valve provided in the discharge pipe and led out to the pressing structure via the fixed scroll. Therefore, in this scroll compressor, when the operation is stopped, the compressed refrigerant compressed in the compression chamber is led to the first space without staying in the second space, so that the differential pressure between the first space and the second space is reduced. It has a structure that can be suppressed. Thereby, a highly reliable scroll compressor can be provided.
  • a scroll compressor according to a fourth aspect of the present invention is the scroll compressor according to the first to third aspects, and includes a floating member that is provided between the housing and the movable scroll and supports the movable scroll in contact therewith. Further prepare. Further, the pressing structure presses the movable scroll against the fixed scroll by pressing the floating member against the movable scroll using one or both of the intermediate refrigerant and the compressed refrigerant.
  • the pressing structure presses the floating member against the movable scroll using the intermediate refrigerant and / or the compressed refrigerant. Thereby, the movable scroll is pressed against the fixed scroll. As a result, separation of the movable scroll and the fixed scroll is prevented, and a highly efficient scroll compressor can be provided.
  • the scroll compressor according to the fifth aspect of the present invention is the scroll compressor according to the fourth aspect, wherein the pressing structure has a back pressure chamber formed between the housing and the floating member. Further, the lead-out passage leads one or both of the intermediate refrigerant and the compressed refrigerant to the back pressure chamber.
  • the scroll compressor according to the fifth aspect since the intermediate refrigerant and / or the compressed refrigerant is led to the back pressure chamber formed between the housing and the floating member, the floating member becomes the movable scroll from the first space side. Pressed. Then, the movable scroll is pressed against the fixed scroll from the first space side.
  • the scroll compressor according to the sixth aspect of the present invention is the scroll compressor according to the first to third aspects, wherein the pressing structure has a back pressure chamber formed between the housing and the movable scroll. Further, the lead-out passage leads one or both of the intermediate refrigerant and the compressed refrigerant to the back pressure chamber.
  • the movable scroll becomes the fixed scroll from the first space side. Pressed.
  • a scroll compressor according to a seventh aspect of the present invention is the scroll compressor according to the first to sixth aspects, wherein a refrigerant having an intermediate pressure between the suction pressure and the discharge pressure is provided in the compression chamber in the first space. It further includes an injection mechanism for introduction.
  • the scroll compressor according to the seventh aspect is provided with an injection mechanism for introducing an intermediate pressure refrigerant into the compression chamber, so that a more efficient scroll compressor can be provided. Further, since the injection mechanism is provided in the first space, overheating of the injection mechanism is suppressed.
  • the scroll compressor which concerns on the 8th viewpoint of this invention is a scroll compressor of the 1st viewpoint to the 7th viewpoint, Comprising:
  • the partition member which can partition the inside of a casing into the 1st space and 2nd space from which pressure differs Is further provided.
  • the inside of the casing can be partitioned into the first space and the second space having different pressures by the above configuration.
  • FIG. 1 It is a mimetic diagram showing an outline of air harmony device 1 in which scroll compressor 10 concerning a 1st embodiment of the present invention is used. It is a schematic diagram which shows the structure of the longitudinal cross-section of the scroll compressor 10 which concerns on the same embodiment. It is a partial enlarged view which shows typically a part of structure of the longitudinal cross-section of the scroll compression mechanism 60 concerning the embodiment. It is a partial enlarged view which shows typically a part of structure of the housing 61 which concerns on the embodiment. 4 is a partially enlarged view schematically showing a part of the configuration of a longitudinal section of a floating member 65 according to the embodiment. FIG. It is a partially expanded view schematically showing a longitudinal section of another form of the first housing communication hole 62a according to the embodiment.
  • FIG. 10 is a partially enlarged view schematically showing a part of the configuration of a vertical cross section of a scroll compression mechanism 60 according to Modification C.
  • FIG. 10 is a partially enlarged view schematically showing a part of the configuration of a vertical cross section of a scroll compression mechanism 60 according to Modification C.
  • FIG. 10 is a partially enlarged view schematically showing a part of the configuration of a vertical cross section of a scroll compression mechanism 60 according to Modification C.
  • a scroll compressor 10 according to a first embodiment of the present invention will be described with reference to the drawings.
  • the scroll compressor 10 which concerns on the following embodiment is only an example of the compressor of this invention, and can be suitably changed in the range which does not deviate from the meaning of this invention.
  • FIG. 1 is a schematic diagram showing an outline of an air conditioner 1 using a scroll compressor 10 according to the first embodiment of the present invention.
  • the air conditioner dedicated to the cooling operation is shown, but the air conditioner using the scroll compressor 10 may be dedicated to the heating operation, or both the cooling operation and the heating operation can be performed. It may be a thing.
  • the air conditioner 1 includes an outdoor unit 2 having a scroll compressor 10, an indoor unit 3, a liquid refrigerant communication pipe 4, and a gas refrigerant communication pipe 5.
  • the outdoor unit 2 mainly includes an accumulator 6, a scroll compressor 10, an outdoor heat exchanger 7, an expansion valve 8, an economizer heat exchanger 9, and an injection valve 26.
  • the indoor unit 3 has an indoor heat exchanger 3a.
  • the liquid refrigerant communication pipe 4 and the gas refrigerant communication pipe 5 connect the outdoor unit 2 and the indoor unit 3, respectively. These devices are connected by a refrigerant pipe as shown in FIG. 1 to form a refrigerant circuit.
  • the scroll compressor 10 compresses the refrigerant sucked through the suction pipe 23 in a compression chamber Sc described later, and discharges the compressed refrigerant from the discharge pipe 24.
  • the suction pipe 23 is connected to the indoor heat exchanger 3a, and the discharge pipe 24 is connected to the outdoor heat exchanger 7.
  • so-called intermediate injection is performed in which a part of the refrigerant flowing from the outdoor heat exchanger 7 toward the expansion valve 8 is supplied to the compression chamber Sc that is being compressed.
  • the refrigerant is supplied to the injection pipe 25 of the scroll compressor 10 through the injection refrigerant supply pipe 27 branched from the pipe connecting the outdoor heat exchanger 7 and the expansion valve 8.
  • the pressure and flow rate of the refrigerant to be injected are adjusted by an injection valve 26 provided in the injection refrigerant supply pipe 27.
  • FIG. 2 is a schematic view showing a configuration of a vertical cross section of the scroll compressor 10 according to the first embodiment of the present invention.
  • FIG. 3 is a partially enlarged view schematically showing a part of the configuration of the vertical cross section of the scroll compression mechanism 60.
  • 4 and 5 are views showing the housing 61 and the floating member 65 shown in FIG. In each drawing, hatching or the like is omitted as appropriate in order to clarify the characteristic part.
  • the scroll compressor 10 includes a casing 20, a partition member 28, a scroll compression mechanism 60 including a fixed scroll 30 and a movable scroll 40, a housing 61, a floating member 65, and a drive.
  • a motor 70, a crankshaft 80, and a lower housing 90 are provided.
  • FIG. 2 sectional drawing of the direction from which the right side differs from the left side from the center is shown. That is, in FIG. 2, the injection pipe 25 is shown on the left side, and the first fixed scroll communication hole 37a and the first housing communication hole 62a that are the discharge passages for the compressed refrigerant, and the second fixed passage that is the discharge passage for the intermediate refrigerant.
  • the scroll communication hole 37b and the second housing communication hole 62b are shown on the right side, these members and the like are actually provided at optimal positions. 2 and 3, the first fixed scroll communication hole 37a and the first housing communication hole 62a, which are compressed refrigerant outlet passages, and the second fixed scroll communication hole 37b and the second housing, which are intermediate refrigerant outlet passages.
  • the communication hole 62b is shown in parallel in the cross-sectional direction, any arrangement may be adopted as long as these lead-out passages are formed at different positions.
  • the scroll compressor 10 has a vertically long cylindrical casing 20.
  • the casing 20 includes a substantially cylindrical cylindrical member (body portion) 21 that is open at the top and bottom, and an upper lid 22 a and a lower lid 22 b provided at the upper end and the lower end of the cylindrical member 21, respectively.
  • the cylindrical member 21, and the upper lid 22a and the lower lid 22b are fixed by welding so as to keep airtightness.
  • the casing 20 accommodates the components of the scroll compressor 10 including the scroll compression mechanism 60, the drive motor 70, the crankshaft 80, and the lower housing 90.
  • the scroll compression mechanism 60 is disposed at the upper part in the cylindrical member 21.
  • An oil sump space So is formed in the lower part of the casing 20.
  • Refrigerating machine oil O for lubricating the scroll compression mechanism 60 and the like is stored in the oil reservoir space So.
  • the inside of the casing 20 is partitioned into a first space S1 and a second space S2 by a partition member 28. Thereby, during the operation of the scroll compressor 10, the first space S1 and the second space S2 have different pressures.
  • the partition member 28 is attached to the upper part of the fixed scroll 30, and the upper part of the casing 20 and the other intermediate part and lower part are partitioned into different spaces.
  • a suction pipe 23 is attached to an intermediate portion of the casing 20 so as to penetrate the cylindrical member 21a and communicate with the first space S1.
  • the low-pressure refrigerant in the refrigeration cycle before being compressed by the scroll compression mechanism 60 flows into the first space S1 through the suction pipe 23.
  • a discharge pipe 24 is attached to the upper lid 22a of the upper portion of the casing 20 so as to communicate with the second space S2.
  • a high-pressure gas refrigerant in the refrigeration cycle after being compressed by the scroll compression mechanism 60 is discharged from the second space S2 through the discharge pipe 24.
  • the scroll compression mechanism 60 includes a fixed scroll 30 having a discharge port 32a and a movable scroll 40 that forms a compression chamber Sc in combination with the fixed scroll 30. Then, the scroll compression mechanism 60 compresses the refrigerant sucked from the first space S1 in the compression chamber Sc and discharges it to the second space S2.
  • the fixed scroll 30 protrudes from the flat fixed end plate 32 and the front surface of the fixed side end plate 32 (the lower surface in FIGS. 2 and 3).
  • a spiral fixed side wrap 33 and an outer edge portion 34 surrounding the fixed side wrap 33 are provided.
  • the fixed side wrap 33 is formed so as to spirally extend from a discharge port 32a, which will be described later, to the outer edge portion 34 (see FIGS. 2 and 3).
  • a suction port (not shown) is provided in the outer edge portion 34 of the fixed scroll 30. The refrigerant flowing from the suction pipe 23 is introduced into the compression chamber Sc of the scroll compression mechanism 60 through the suction port.
  • a discharge port 32 a communicating with the compression chamber Sc of the scroll compression mechanism 60 is formed in the center of the fixed side end plate 32 so as to penetrate the fixed side end plate 32 in the thickness direction.
  • the discharge port 32a is closed by a discharge valve 35 that functions as a check valve.
  • a discharge chamber 36 is defined between the discharge valve 35 and the compression chamber Sc. The discharge valve 35 is opened when the compressed refrigerant in the discharge chamber 36 has a predetermined pressure or higher, and discharges the compressed refrigerant into the second space S2.
  • the second space S2 has a pressure atmosphere equivalent to the pressure of the compressed refrigerant discharged from the scroll compression mechanism 60.
  • the discharge chamber 36 is formed with an inlet 36a of a first fixed scroll communication hole 37a described later.
  • the fixed scroll 30 is supported on the lower surface (that is, the thrust surface) of the outer edge portion 34 by the support surface 61s of the housing 61 described later.
  • a communication hole is formed in each of the fixed scroll 30 and the housing 61 so as to communicate with the support surface 61s.
  • the fixed scroll 30 is formed with a first fixed scroll communication hole 37a and a second fixed scroll communication hole 37b.
  • the inflow end of the first fixed scroll communication hole 37a is an inflow port 36a that opens to the discharge chamber 36, and the outflow end of the first fixed scroll communication hole 37a continues to the first housing communication hole 62a on the support surface 61s. It is an opening formed at a position.
  • the inflow end of the second fixed scroll communication hole 37b is an opening formed in the upper portion of the compression chamber Sc, and communicates with the compression chamber Sc when the turning angle of the movable scroll 40 falls within a predetermined range.
  • the outflow end of the second fixed scroll communication hole 37b is an opening formed at a position continuous with the second housing communication hole 62b on the support surface 61s.
  • the fixed side end plate 32 is formed with an injection passage 31 that opens on the side surface of the fixed side end plate 32 and communicates with the compression chamber Sc.
  • the pressure of the refrigerant supplied from the injection pipe 25 is higher than the pressure in the compression chamber Sc, the refrigerant is supplied to the compression chamber Sc.
  • the pressure of the refrigerant supplied from the injection pipe 25 is lower than the pressure of the compression chamber Sc, the reverse flow of the refrigerant is suppressed (blocked) by a check valve (not shown) provided in the injection passage 31.
  • the injection pipe 25 is attached to the fixed scroll 30 in the first space S1 below the partition member 28. Thus, the injection pipe 25 is prevented from being overheated by being attached to the first space S1 instead of the second space S2.
  • the movable scroll 40 protrudes from a flat plate-shaped movable side end plate 41 and the front surface of the movable side end plate 41 (the upper surface in FIGS. 2 and 3). It has a spiral movable wrap 42 and a cylindrical boss 43 that protrudes from the back surface (lower surface in FIGS. 2 and 3) of the movable side end plate 41.
  • the fixed side wrap 33 of the fixed scroll 30 and the movable side wrap 42 of the movable scroll 40 are combined so that the lower surface of the fixed side end plate 32 and the upper surface of the movable side end plate 41 face each other.
  • the compression chamber Sc is formed between the adjacent fixed side wrap 33 and the movable side wrap 42.
  • the volume of the compression chamber Sc changes periodically. Thereby, the refrigerant sucked from the first space S1 is compressed in the compression chamber Sc.
  • the boss portion 43 has a cylindrical shape with a closed upper end. An eccentric portion 81 of a crankshaft 80 described later is inserted into the hollow portion of the boss portion 43. Thereby, the movable scroll 40 and the crankshaft 80 are connected.
  • the boss portion 43 is disposed in the eccentric portion space Sh formed between the movable scroll 40 and the floating member 65.
  • the eccentric part space Sh communicates with the first space S1 and has the same pressure atmosphere as the suction pressure.
  • the Oldham joint 58 is a member that prevents the movable scroll 40 from rotating and enables revolution.
  • the housing 61 is a member that is press-fitted into the cylindrical member 21 and is fixed below the partition member 28. Specifically, as shown in FIGS. 3 and 4, the housing 61 includes a first housing portion 61 a and a second housing portion 61 b from above.
  • the first housing portion 61a and the second housing portion 61b are members each having a cylindrical portion having a substantially circular or substantially arc-shaped cross section, and both are integrally formed continuously.
  • the inner periphery of the first housing part 61a is larger than the inner periphery of the second housing part 61b. Therefore, the housing 61 has a shape in which the second housing portion 61b extends from the first housing portion 61a.
  • the floating member 65 is supported by the upper surface of the extension part extended from the 1st housing part 61a of the 2nd housing part 61b contacting the lower surface of the floating member 65 mentioned later.
  • the first diameter space 101b of the first back pressure chamber 101 and the second diameter of the second back pressure chamber 102 are between the upper surface of the extended portion of the second housing portion 61b and the lower surface of the floating member 65.
  • a space 102b is formed. Details will be described later.
  • a part of the upper end surface of the first housing portion 61a is in close contact with the lower surface of the outer edge portion 34 of the fixed scroll 30, and is fixed by a bolt or the like (not shown). That is, a part of the upper end surface of the housing 61 functions as a support surface 61 s that supports the fixed scroll 30. Further, in the support surface 61s, the first housing communication hole 62a and the second housing communication hole 62b are formed so as to be continuous with the first fixed scroll communication hole 37a and the second fixed scroll communication hole 37b, respectively.
  • the housing communication holes 62a and 62b communicate with back pressure chambers 101 and 102, which will be described later.
  • the floating member 65 is a member that is provided between the housing 61 and the movable scroll 40 in the first space S1, and is in contact with and supports the movable scroll 40. Specifically, as shown in FIGS. 3 and 5, the floating member 65 includes a first floating portion 65 a formed so that the center portion of the upper surface is recessed, and a second floating portion 65 b formed below the first floating portion 65 a. And a third floating portion 65c that connects the first floating portion 65a and the second floating portion 65b.
  • the first floating portion 65a is formed so as to surround the side surface of the eccentric portion space Sh in which the boss portion 43 of the movable scroll 40 is disposed.
  • the first floating part 65a is formed so that the side surface is surrounded by the first housing part 61a.
  • the second floating portion 65b is formed in a cylindrical shape, and a bearing 66 that supports the main shaft 82 of the crankshaft 80 is provided. A main shaft 82 is inserted into the bearing 66, and the main shaft 82 is rotatably supported.
  • the third floating portion 65c is a cylindrical member, and connects the inside of the first floating portion 65a and the outside of the second floating portion 65b.
  • the third floating portion 65c is formed so that the side surface is surrounded by the second housing portion 61b.
  • the above-mentioned floating member 65 is disposed so as to be fitted inside the housing 61.
  • the first back pressure chamber 101 and the second back pressure chamber 102 are formed between the floating member 65 and the housing 61.
  • the first back pressure chamber 101 communicates with the discharge chamber 36 via the first fixed scroll communication hole 37a and the first housing communication hole 62a.
  • the “compressed refrigerant” discharged from the compression chamber Sc is introduced into the first back pressure chamber 101.
  • the second back pressure chamber 102 communicates with the compression chamber Sc via the second fixed scroll communication hole 37b and the second housing communication hole 62b. Then, an “intermediate refrigerant” being compressed in the compression chamber Sc is introduced into the second back pressure chamber 102.
  • the first back pressure chamber 101 includes the first axial space 101a extending in the axial direction between the inner peripheral surface of the second housing portion 61b and the outer peripheral surface of the third floating portion 65c, and the second housing portion 61b.
  • a first radial space 101b extending in the radial direction is formed between the upper surface and the lower surface of the first floating portion 65a.
  • the first housing communication hole 62a is formed to communicate with the first shaft space 101a.
  • the inner peripheral surface of the second housing portion 61b and the outer peripheral surface of the third floating portion 65c are sealed by an O-ring 64a.
  • the upper surface of the second housing part 61b and the lower surface of the first floating part 65a are sealed by an annular seal member 64c having a C-shaped cross section.
  • the seal member 64c has an opening inside.
  • the second back pressure chamber 102 includes a second axial space 102a extending in the axial direction between the inner peripheral surface of the first housing portion 61a and the outer peripheral surface of the first floating portion 65a, and the upper surface of the second housing portion 61b. And a second radial space 102b extending in the radial direction between the lower surface of the first floating portion 65a.
  • the inner peripheral surface of the first housing portion 61a and the outer peripheral surface of the first floating portion 65a are sealed by the O-ring 64b.
  • the upper surface of the second housing part 61b and the lower surface of the first floating part 65a are sealed by an annular seal member 64c having a C-shaped cross section.
  • the first diameter space 101b and the second diameter space 102b are partitioned by the seal member 64, and the C-shaped seal member 64c is arranged to have an opening on the first diameter space 101b side.
  • the drive motor 70 is accommodated in an annular stator 71 fixed to the inner wall surface of the cylindrical member 21 and rotatably inside the stator 71 with a slight gap (air gap passage). And a rotor 72.
  • the rotor 72 is connected to the movable scroll 40 via a crankshaft 80 disposed so as to extend in the vertical direction along the axial center of the cylindrical member 21. As the rotor 72 rotates, the movable scroll 40 revolves with respect to the fixed scroll 30.
  • crankshaft 80 (drive shaft) is disposed in the cylindrical member 21 and drives the scroll compression mechanism 60. Specifically, the crankshaft 80 transmits the driving force of the driving motor 70 to the movable scroll 40.
  • the crankshaft 80 is disposed so as to extend in the vertical direction along the axial center of the cylindrical member 21, and connects the rotor 72 of the drive motor 70 and the movable scroll 40 of the scroll compression mechanism 60.
  • the crankshaft 80 has a main shaft 82 whose center axis coincides with the axis of the cylindrical member 21, and an eccentric portion 81 that is eccentric with respect to the axis of the cylindrical member 21.
  • the eccentric portion 81 is inserted into the boss portion 43 of the movable scroll 40 as described above.
  • the main shaft 82 is rotatably supported by the bearing 66 of the floating member 65 and the lower bearing 91.
  • the main shaft 82 is connected to the rotor 72 of the drive motor 70 between the floating member 65 and the lower housing 90.
  • an oil supply path 83 for supplying the refrigerator oil O to the scroll compression mechanism 60 and the like is formed in the crankshaft 80.
  • the lower end of the main shaft 82 is located in an oil sump space So formed in the lower part of the casing 20, and the refrigerating machine oil O in the oil sump space So is supplied to the scroll compression mechanism 60 and the like through the oil supply path 83.
  • the lower housing 90 is provided at the lower part in the cylindrical member 21 and supports the crankshaft 80. Specifically, the lower housing 90 has a lower bearing 91 on the lower end side of the crankshaft 80. Thereby, the main shaft 82 of the crankshaft 80 is rotatably supported. Note that an oil pickup communicating with the oil supply path 83 of the crankshaft 80 is fixed to the lower housing 90.
  • the drive motor 70 is activated. Thereby, the rotor 72 rotates with respect to the stator 71, and the crankshaft 80 to which the rotor 72 is fixed rotates.
  • the crankshaft 80 rotates, the movable scroll 40 connected to the crankshaft 80 revolves with respect to the fixed scroll 30.
  • the low-pressure gas refrigerant in the refrigeration cycle is introduced into the first space S ⁇ b> 1 inside the casing 20 through the suction pipe 23.
  • the gas refrigerant introduced into the first space S1 is sucked into the compression chamber Sc from the suction port of the fixed scroll 30.
  • the movable scroll 40 revolves, the first space S1 and the compression chamber Sc are not in communication.
  • the pressure inside the compression chamber Sc increases.
  • the gas refrigerant in the compression chamber Sc is compressed as the volume of the compression chamber Sc decreases, and finally becomes a high-pressure gas refrigerant.
  • the high-pressure gas refrigerant is discharged from the compression chamber Sc to the discharge chamber 36, and pushes up the discharge valve 35 to flow into the second space S2. Then, the high-pressure gas refrigerant is discharged to the outside of the casing 20 through the discharge pipe 24.
  • the second space S2 is maintained in a high pressure state by the check valve provided in the discharge valve 35.
  • the compression chamber Sc and the second fixed scroll communication hole 37b are intermittently communicated with each other as the movable scroll 40 turns. Therefore, part of the intermediate refrigerant that is being compressed in the compression chamber Sc is led out to the second back pressure chamber 102 via the second fixed scroll communication hole 37b and the second housing communication hole 62b. As a result, pressure is applied to the floating member 65 upward. The floating member 65 applies pressure upward to the movable scroll 40. As a result, the movable scroll 40 is pressed against the fixed scroll 30.
  • the scroll compressor 10 includes the casing 20, the scroll compression mechanism 60, the housing 61, the first back pressure chamber 101 and the second back pressure chamber 102 (pressing structure), A discharge valve 35 (backflow prevention mechanism), a first fixed scroll communication hole 37a and a second fixed scroll communication hole 37b (lead-out passage) are provided.
  • the inside of the casing 20 is partitioned into a first space S1 and a second space S2.
  • the scroll compression mechanism 60 includes a fixed scroll 30 and a movable scroll 40 that forms a compression chamber Sc in combination with the fixed scroll 30. Then, the scroll compressor 10 compresses the refrigerant sucked from the first space S1 in the compression chamber Sc and discharges it to the second space S2.
  • the housing 61 is attached inside the first space S ⁇ b> 1 and is used for supporting the movable scroll 40.
  • the first back pressure chamber 101 and the second back pressure chamber 102 use the movable scroll 40 using one or both of an intermediate refrigerant being compressed in the compression chamber Sc and a compressed refrigerant discharged from the compression chamber Sc. Is pressed against the fixed scroll 30.
  • the discharge valve 35 is provided in the second space S2, and prevents the backflow of the compressed refrigerant.
  • the first fixed scroll communication hole 37a and the second fixed scroll communication hole 37b take out one or both of the intermediate refrigerant and the compressed refrigerant from the upstream side with respect to the discharge valve 35 (backflow prevention mechanism), and the first back pressure It leads to the chamber 101 and the second back pressure chamber 102.
  • the intermediate refrigerant (intermediate pressure refrigerant) and / or the compressed refrigerant (high pressure refrigerant) is taken out from the upstream side of the discharge valve 35 (backflow prevention mechanism) and the first back pressure is obtained.
  • the first back pressure chamber 101 and the second back pressure chamber 102 move the movable scroll 40 to the fixed scroll 30 from the first space S1 (low pressure space) side. Press.
  • the highly efficient scroll compressor 10 can be provided.
  • the scroll compressor 10 when the operation is stopped, the compressed refrigerant compressed in the compression chamber Sc is led out to the first space S1 before flowing out downstream from the discharge valve 35 (backflow prevention mechanism). Is done.
  • the discharge valve 35 backflow prevention mechanism
  • the discharge valve 35 since the discharge valve 35 (backflow prevention mechanism) is provided in the second space S2, it has a structure capable of suppressing the differential pressure between the first space S1 and the second space S2. Thereby, a highly reliable scroll compressor can be provided.
  • a differential pressure is generated between the first space S1 and the second space S2 inside the scroll compression mechanism 60 when the operation is stopped. Become. If the state in which such differential pressure occurs is prolonged, problems such as shortening of the life of the seal member between various members and occurrence of liquid compression upon restarting occur.
  • the compressed refrigerant compressed in the compression chamber Sc flows out into the second space S2 downstream of the discharge valve 35 (backflow prevention mechanism). Therefore, it is possible to suppress the occurrence of a differential pressure between the scroll compression mechanism 60 and the second space S2.
  • the scroll compressor 10 has a floating member 65 between the housing 61 and the movable scroll 40 that supports the movable scroll 40 in contact therewith.
  • the first back pressure chamber 101 and the second back pressure chamber 102 press the floating member 65 against the movable scroll 40 using either one or both of the intermediate refrigerant and the compressed refrigerant, thereby fixing the movable scroll 40 to the fixed scroll 30. Press on.
  • the floating member 65 that is separate from the housing 61
  • a pressing force can be applied to the movable scroll 40 with a simple structure.
  • the back pressure chamber can be formed with a high degree of freedom by using the floating member 65.
  • the movable scroll 40 can be pressed against the fixed scroll 30 with an optimal pressing force.
  • the scroll compressor 10 includes an injection pipe 25 (injection mechanism) in the first space S1 for introducing a refrigerant having an intermediate pressure between the suction pressure and the discharge pressure into the compression chamber Sc. .
  • injection pipe 25 injection mechanism
  • the scroll compressor 10 includes an injection pipe 25 (injection mechanism) in the first space S1 for introducing a refrigerant having an intermediate pressure between the suction pressure and the discharge pressure into the compression chamber Sc.
  • the fixed scroll In the conventional low-pressure dome type scroll compressor, if the fixed scroll is pressed against the movable scroll from above (the second space S2), the fixed scroll moves in the axial direction, making it difficult to install the injection mechanism.
  • the fixed scroll 30 In the configuration of the scroll compressor 10 according to the present embodiment, since the movable scroll 40 is pressed against the fixed scroll 30 from below (first space S1), the fixed scroll 30 may be moved in the axial direction. Absent. As a result, it is possible to provide the scroll compressor 19 in which the injection pipe 25 can be easily installed and the compression efficiency can be further increased.
  • the scroll compressor 10 since the scroll compressor 10 according to the present embodiment includes the partition member 28, the inside of the casing 20 can be easily partitioned into the first space S1 and the second space S2 having different pressures.
  • the first back pressure chamber 101 is formed in the radial direction, continuous with the first axial space 101a formed in the axial direction, and the first axial space 101a.
  • a first diameter space 101b is provided. 2 and 3 described above, the first housing communication hole 62a is formed to communicate with the first shaft space 101a, so that the first housing communication hole 62a can be easily processed.
  • the form of the first housing communication hole 62a is not limited to this, and the hole may be bent in the middle as shown in FIG. 6 to communicate with the first diameter space 101b.
  • the first housing communication hole 62a does not interfere with the space for installing the O-ring 64a and the like formed between the second housing portion 61b and the third floating portion 65c.
  • the thickness of the second housing part 61b can be reduced.
  • the compressed refrigerant is introduced into the first back pressure chamber 101 and the intermediate refrigerant is led into the second back pressure chamber 102.
  • the first back pressure chamber 101 is formed inside the second back pressure chamber 102, the pressure distribution of the entire back pressure chamber is directed toward the center in the radial direction during the operation of the scroll compressor 10. Configured to be high.
  • the scroll compressor 10 according to the present embodiment is configured such that the pressure in the back pressure chamber increases according to the pressure distribution in the compression chamber Sc during operation. With such a configuration, the movable scroll 40 can be pressed against the fixed scroll 30 with an optimal pressing force.
  • first space S1 and the second space 62 are partitioned by the partition member 28, but the configuration of the scroll compressor 10 according to the present embodiment is not limited to this.
  • the first space S ⁇ b> 1 and the second space S ⁇ b> 2 may be formed by fitting a part of the constituent members of the fixed scroll 30 along the inner wall of the casing 20.
  • the first back pressure chamber 101 into which the compressed refrigerant is introduced and the second back pressure chamber 102 into which the intermediate refrigerant is introduced are configured.
  • the configuration of the scroll compressor 10 according to the present embodiment is as follows. However, it is not limited to this.
  • an intermediate refrigerant may be introduced into the first back pressure chamber 101 and a compressed refrigerant may be introduced into the second back pressure chamber 102.
  • the number of back pressure chambers may not be two. For example, it is possible to adopt a configuration in which a single back pressure chamber is provided and a compressed refrigerant and an intermediate refrigerant are introduced into the back pressure chamber.
  • the scroll compressor 10 may have a configuration in which a check valve 24a is simply provided in the discharge pipe 24 as shown in FIG. That is, regardless of whether or not the discharge valve 35 is provided at the discharge port 32 a of the fixed scroll 30, the check pipe 24 a is provided in the discharge pipe 24, and the first fixed scroll communication hole 37 a is provided at a predetermined position of the fixed scroll 30. If this is the case, when the operation is stopped, the compressed refrigerant compressed in the compression chamber Sc is led out to the first space S1 before flowing out downstream of the check valve 24a (backflow prevention mechanism) of the discharge pipe 24. Further, it is possible to suppress the occurrence of a differential pressure between the scroll compression mechanism 60 and the second space S2.
  • the discharge chamber 36 may not be provided with the inlet 36a of the first fixed scroll communication hole 37a.
  • a configuration in which the inlet 34a of the first fixed scroll communication hole 37a is provided on the upper surface of the fixed scroll may be employed.
  • the place where the first fixed scroll communication hole 37a is formed can be provided at any place without changing the gist of the invention.
  • the floating member 65 is provided between the housing 61 and the movable scroll 40, and the first back pressure chamber 101 and the second back pressure chamber 102 are formed between the housing 61 and the floating member 65.
  • the configuration of the scroll compressor 10 according to the present embodiment is not limited to this. That is, in the scroll compressor 10 according to this embodiment, the communication hole formed in the fixed scroll takes out one or both of the intermediate refrigerant and the compressed refrigerant from the upstream side of the discharge valve 35 (backflow prevention mechanism). Any configuration can be adopted as long as the configuration leads to the back pressure chamber.
  • the scroll compressor 10 according to this embodiment may have a back pressure chamber between the housing 61 and the movable scroll 40. In this case, the floating member 65 becomes unnecessary.
  • Scroll compressor 20 Casing 24 Discharge pipe 24a Check valve (backflow prevention mechanism) 25 Injection piping (injection mechanism) 28 Partition member 30 Fixed scroll 32a Discharge port 34a Inlet port 35 Discharge valve (backflow prevention mechanism) 36a Inflow port 37a First fixed scroll communication hole (lead-out passage) 37b Second fixed scroll communication hole (lead-out passage) 40 movable scroll 60 scroll compression mechanism 61 housing 61a first housing part 61b second housing part 62a first housing communication hole 62b second housing communication hole 65 floating member 65a first floating part 65b second floating part 65c third floating part 101 1st back pressure chamber (pressing structure) 101a First shaft space 101b First diameter space 102 Second back pressure chamber (pressing structure) 102a Second shaft space 102b Second diameter space S1 First space S2 Second space Sc Compression chamber

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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

La présente invention concerne un compresseur à spirale présentant un rendement de compression élevé. Un compresseur à spirale (10) est pourvu d'un carter (20), d'un mécanisme de compression à spirale (60), d'un logement (61), d'une première chambre de contre-pression (101), une seconde chambre de contre-pression (102), d'une soupape d'évacuation (35), d'un premier trou de communication à spirale fixe (37a), et d'un second trou de communication à spirale fixe (37b). Dans la présente invention, la soupape d'évacuation (35), qui est disposée dans un second espace (S2), inhibe le reflux du fluide frigorigène comprimé. De plus, le premier trou de communication à spirale fixe (37a) et le second trou de communication à spirale fixe (37b) extraient l'un ou les deux d'un fluide frigorigène intermédiaire et du fluide frigorigène comprimé depuis l'amont de la soupape d'évacuation (35), et guident le fluide frigorigène vers la première chambre de contre-pression (101) et la seconde chambre de contre-pression (102).
PCT/JP2017/030535 2016-08-31 2017-08-25 Compresseur à spirale WO2018043329A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201780052729.5A CN109642572B (zh) 2016-08-31 2017-08-25 涡旋压缩机

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JP2016169772A JP6779712B2 (ja) 2016-08-31 2016-08-31 スクロール圧縮機
JP2016-169772 2016-08-31

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WO2018043329A1 true WO2018043329A1 (fr) 2018-03-08

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2020193575A (ja) * 2019-05-27 2020-12-03 ダイキン工業株式会社 スクロール圧縮機およびそれを備えた冷凍装置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09310687A (ja) * 1996-05-20 1997-12-02 Nippon Soken Inc スクロール型圧縮機
JP2000297770A (ja) * 1999-04-15 2000-10-24 Mitsubishi Heavy Ind Ltd クラッチレススクロール型流体機械
JP2001336485A (ja) * 2000-05-29 2001-12-07 Mitsubishi Electric Corp スクロール圧縮機
JP2015038327A (ja) * 2013-08-19 2015-02-26 株式会社豊田自動織機 電動スクロール型圧縮機

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Publication number Priority date Publication date Assignee Title
JPH0378586A (ja) * 1989-08-21 1991-04-03 Daikin Ind Ltd スクロール型流体装置
JPH0658268A (ja) * 1992-08-10 1994-03-01 Kubota Corp スクロール圧縮機
JPH10325396A (ja) * 1997-05-27 1998-12-08 Mitsubishi Heavy Ind Ltd スクロール圧縮機及びその背圧制御弁
JP2008101559A (ja) * 2006-10-20 2008-05-01 Hitachi Appliances Inc スクロール圧縮機およびそれを用いた冷凍サイクル
US20140271302A1 (en) * 2013-03-18 2014-09-18 Suchul Kim Scroll compressor with a bypass
JP2016011650A (ja) * 2014-06-30 2016-01-21 ダイキン工業株式会社 スクロール型流体機械

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09310687A (ja) * 1996-05-20 1997-12-02 Nippon Soken Inc スクロール型圧縮機
JP2000297770A (ja) * 1999-04-15 2000-10-24 Mitsubishi Heavy Ind Ltd クラッチレススクロール型流体機械
JP2001336485A (ja) * 2000-05-29 2001-12-07 Mitsubishi Electric Corp スクロール圧縮機
JP2015038327A (ja) * 2013-08-19 2015-02-26 株式会社豊田自動織機 電動スクロール型圧縮機

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JP6779712B2 (ja) 2020-11-04
CN109642572B (zh) 2020-12-25
CN109642572A (zh) 2019-04-16

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