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
  • 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
  • F04C18/0253—Details concerning the base
  • F04C18/0261—Details of the ports, e.g. location, number, geometry
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
  • F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
  • F04C29/12—Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet

Definitions

• the present invention relates to a scroll-type fluid machine.
• Patent Document 1 discloses a scroll-type compressor that is one of scroll-type fluid machines.
• the scroll-type compressor includes a fixed scroll, an orbiting scroll, and a driving shaft that causes the orbiting scroll to orbit relative to the fixed scroll.
• the fixed scroll has an end plate, a spiral-shaped wrap erected on one surface of the end plate, and a suction hole and a discharge hole bored into the end plate.
• the orbiting scroll has an end plate and a spiral-shaped wrap erected on one surface of the end plate so as to face the fixed scroll.
• the suction hole of the fixed scroll is arranged in a winding direction range of the wrap in which range the wrap of the orbiting scroll is located on the outermost peripheral side relative to the wrap of the fixed scroll between a first confinement start position (specifically, the position where the winding end of the wrap of the orbiting scroll is brought into contact with the wrap of the fixed scroll) and a second confinement start position (specifically, the position where the winding end of the wrap of the fixed scroll is brought into contact with the wrap of the orbiting scroll).
• a first confinement start position specifically, the position where the winding end of the wrap of the orbiting scroll is brought into contact with the wrap of the fixed scroll
• a second confinement start position specifically, the position where the winding end of the wrap of the fixed scroll is brought into contact with the wrap of the orbiting scroll.
• a plurality of first working chambers are formed between the inner peripheral side of the wrap of the orbiting scroll and the outer peripheral side of the wrap of the fixed scroll, and a first suction flow path is formed on the outermost peripheral side of the wrap of the orbiting scroll.
• the first working chamber moves in the winding direction of the wrap and sequentially performs a suction process, a compression process, and a discharge process.
• the first working chamber in the suction process sucks in gas through the suction hole of the fixed scroll and the first suction flow path.
• the first working chamber in the compression process compresses the gas.
• the first working chamber in the discharge process discharges the compressed gas through the discharge hole of the fixed scroll.
• a plurality of second working chambers are formed between the inner peripheral side of the wrap of the fixed scroll and the outer peripheral side of the wrap of the orbiting scroll, and a second suction flow path is formed on the outermost peripheral side of the wrap of the orbiting scroll.
• the second working chamber moves in the winding direction of the wrap and sequentially performs a suction process, a compression process, and a discharge process.
• the second working chamber in the suction process sucks in gas through the suction hole of the fixed scroll and the second suction flow path.
• the second working chamber in the compression process compresses the gas.
• the second working chamber in the discharge process discharges the compressed gas through the discharge hole of the fixed scroll.
• Patent Document 1 JP-2008-185020-A
• Patent Document 1 a suction loss is reduced by forming the groove in the non-sliding region of the end plate of the fixed scroll to expand the cross-sectional area of the first suction flow path, but the reduction is limited.
• the present invention has been made in view of the foregoing, and one of the objects thereof is to reduce a suction loss.
• the present invention includes a plurality of means for solving the above problems, and an example thereof is a scroll-type fluid machine including: a fixed scroll that has an end plate, a spiral-shaped wrap erected on one surface of the end plate, and a suction hole bored into the end plate; an orbiting scroll that has an end plate and a spiral-shaped wrap erected on one surface of the end plate so as to face the fixed scroll; and a driving shaft that causes the orbiting scroll to orbit relative to the fixed scroll, in which the suction hole of the fixed scroll is arranged in a winding direction range of the wrap in which range the wrap of the orbiting scroll is located on an outermost peripheral side relative to the wrap of the fixed scroll between a first confinement start position where a winding end of the wrap of the orbiting scroll is brought into contact with the wrap of the fixed scroll and a second confinement start position where a winding end of the wrap of the fixed scroll is brought into contact with the wrap of the orbiting scroll, the
• a suction loss can be reduced.
• FIG. 1 to FIG. 5 One embodiment to which the present invention is applied will be described by using FIG. 1 to FIG. 5 .
• FIG. 1 is a side view for depicting a structure of a scroll-type compressor in the present embodiment.
• FIG. 2 is a cross-sectional view in the axial direction for depicting a structure of the scroll-type compressor in the present embodiment.
• FIG. 3A to FIG. 3D are cross-sectional views in the radial direction according to arrows III-III of FIG. 2 and depict cases where the crank angles of a driving shaft are 0 degree, 90 degrees, 180 degrees, and 270 degrees.
• FIG. 4 is a partially enlarged cross-sectional view of a part IV of FIG. 3D .
• FIG. 5 corresponds to FIG. 4 and is a diagram for explaining a relation between a suction hole of a fixed scroll and a tip seal of an orbiting scroll.
• the scroll-type compressor of the present embodiment includes a casing 10, a fixed scroll 11, an orbiting scroll 12, a driving shaft 13, a cooling fan 14, and a duct 15.
• the fixed scroll 11 is coupled to the opening side (the right side in FIG. 1 and FIG. 2 ) of the casing 10.
• the orbiting scroll 12 is housed in the casing 10.
• the driving shaft 13 is rotatably supported by bearings 16 in the casing 10.
• the cooling fan 14 rotates together with the driving shaft 13 to generate cooling air. Although only a part of the duct 15 is illustrated, the duct 15 derives the cooling air generated by the cooling fan 14.
• the fixed scroll 11 has a substantially circular-shaped end plate 17, a spiral-shaped wrap 18 erected on one surface (the left side surface in FIG. 2 ) of the end plate 17, a suction hole 19 bored into the end plate 17 and extending in a direction (the left-right direction of FIG. 2 ) perpendicular to the above-described one surface of the end plate 17, and a discharge hole 20 bored into the end plate 17 and extending in a direction perpendicular to the above-described one surface of the end plate 17.
• a suction filter 21 is connected to the suction hole 19 of the fixed scroll 11, and a discharge pipe 22 is connected to the discharge hole 20 of the fixed scroll 11.
• the fixed scroll 11 further has a plurality of cooling fins 23 erected on the opposite surface (the right side surface in FIG. 2 ) of the end plate 17 and a cover 24 attached to the tip side of the cooling fins 23. Cooling air from the duct 15 flows through a flow path formed by the cooling fins 23 and the cover 24. Thus, the fixed scroll 11 is cooled.
• the orbiting scroll 12 has a substantially circular-shaped end plate 25, a spiral-shaped wrap 26 erected on one surface (the right side surface in FIG. 2 ) of the end plate 25 so as to face the fixed scroll 11, a plurality of cooling fins 27 erected on the opposite surface (the left side surface in FIG. 2 ) of the end plate 25, and a plate 28 attached to the tip side of the cooling fins 27. Cooling air from the duct 15 flows through a flow path formed by the cooling fins 27 and the plate 28. Thus, the orbiting scroll 12 is cooled.
• the wrap 26 of the orbiting scroll 12 and the wrap 18 of the fixed scroll 11 are symmetrically arranged.
• a groove 29 (see FIG. 5 ) is formed on the tip side of the wrap 26 of the orbiting scroll 12, a tip seal (sliding material) 30 (see FIG. 5 ) is inserted into the groove 29, and the tip seal 30 is brought into contact with the end plate 17 of the fixed scroll 11.
• a groove is formed on the tip side of the wrap 18 of the fixed scroll 11, and a tip seal is inserted into the groove, and the tip seal is brought into contact with the end plate 25 of the orbiting scroll 12.
• a crank portion 31 is provided on one end side (the right side in FIG. 1 and FIG. 2 ) of the driving shaft 13.
• the center O2 of the crank portion 31 of the driving shaft 13 is made eccentric from the center O1 of the driving shaft 13, and is connected to a boss portion of the plate 28 of the orbiting scroll 12 through an orbiting bearing 32.
• the other end side (the left side in FIG. 1 and FIG. 2 ) of the driving shaft 13 projects outside the casing 10, and is provided with a pulley 33.
• a belt (not illustrated) is stretched between a pulley (not illustrated) provided at a rotating shaft (not illustrated) of an electric motor and the pulley 33.
• the rotating force of the electric motor is transmitted to rotate the driving shaft 13, and the orbiting scroll 12 orbits relative to the fixed scroll 11.
• a rotation preventing mechanism for preventing rotation of the orbiting scroll 12 is provided in the casing 10.
• the crank angle of the driving shaft 13 is the rotation angle of a straight line connecting the above-described centers O1 and O2 to each other, and as depicted in FIG. 3A , the angle at which the winding end of the wrap 26 of the orbiting scroll 12 is brought into contact with the wrap 18 of the fixed scroll 11 and the winding end of the wrap 18 of the fixed scroll 11 is brought into contact with the wrap 26 of the orbiting scroll 12 is used as a reference (0 degrees).
• the suction hole 19 of the fixed scroll 11 is arranged in a winding direction range of the wrap 18 (in other words, a circumferential direction range of the driving shaft 13) in which range the wrap 26 of the orbiting scroll 12 is located on the outermost peripheral side relative to the wrap 18 of the fixed scroll 11 between a first confinement start position A (specifically, the position where the winding end of the wrap 26 of the orbiting scroll 12 is brought into contact with the wrap 18 of the fixed scroll 11) and a second confinement start position B (specifically, the position where the winding end of the wrap 18 of the fixed scroll 11 is brought into contact with the wrap 26 of the orbiting scroll 12) depicted in FIG. 3A .
• the suction hole 19 of the fixed scroll 11 is arranged at a position in the winding direction of the wrap 18, which position is in the middle between the first confinement start position A and the second confinement start position B (in other words, a position in the circumferential direction of the driving shaft 13).
• a plurality of first working chambers 34 are formed between the inner peripheral side (specifically, an inner surface CD depicted in FIG. 3B ) of the wrap 26 of the orbiting scroll 12 and the outer peripheral side (specifically, an outer surface FG depicted in FIG. 3B ) of the wrap 18 of the fixed scroll 11, and a first suction flow path 35 is formed on the outermost peripheral side of the wrap 26 of the orbiting scroll 12.
• the first working chamber 34 moves in the winding direction of the wrap 26 and sequentially performs a suction process, a compression process, and a discharge process.
• the first working chamber performs the suction process for sucking in gas (for example, air) through the suction filter 21, the suction hole 19 of the fixed scroll 11, and the first suction flow path 35.
• the first working chamber performs the compression process for compressing (pressurizing) the gas.
• the first working chamber performs the discharge process for discharging the compressed gas through the discharge hole 20 of the fixed scroll 11 and the discharge pipe 22.
• a plurality of second working chambers 36 are formed between the inner peripheral side (specifically, an inner surface HG depicted in FIG. 3B ) of the wrap 18 of the fixed scroll 11 and the outer peripheral side (specifically, an outer surface ED depicted in FIG. 3B ) of the wrap 26 of the orbiting scroll 12, and a second suction flow path 37 is formed on the outermost peripheral side of the wrap 26 of the orbiting scroll 12.
• the second working chamber 36 moves in the winding direction of the wrap 26 and sequentially perform a suction process, a compression process, and a discharge process.
• the crank angle of the driving shaft 13 is 0 to 360 degrees (in other words, during one revolution of the driving shaft 13)
• the second working chamber performs the suction process for sucking in gas through the suction filter 21, the suction hole 19 of the fixed scroll 11, and the second suction flow path 37.
• the crank angle of the driving shaft 13 is 360 to 1170 degrees (in other words, until the crank angle of the driving shaft 13 becomes 90 degrees after the driving shaft 13 makes three revolutions)
• the second working chamber performs the compression process for compressing the gas.
• the crank angle of the driving shaft 13 is 1170 degrees or more
• the second working chamber performs the discharge process for discharging the compressed gas through the discharge hole 20 of the fixed scroll 11 and the discharge pipe 22.
• the suction hole 19 of the fixed scroll 11 is intermittently in direct communication with the first working chamber 34 in the suction process.
• the suction hole 19 of the fixed scroll 11 has an opening 19a that opens on the above-described one surface of the end plate 17, and the opening 19a partially overlaps the moving range of the wrap 26 of the orbiting scroll 12.
• the opening 19a of the suction hole 19 of the fixed scroll 11 partially overlaps the moving range of the first working chamber 34 in the suction process.
• the opening 19a of the suction hole 19 of the fixed scroll 11 does not overlap the first working chamber 34 in the suction process. Therefore, the suction hole 19 of the fixed scroll 11 is in communication with the first working chamber 34 in the suction process through the first suction flow path 35 from the entire opening 19a.
• the crank angle of the driving shaft 13 is in a second range (for example, 225 to 315 degrees)
• a part of the opening 19a of the suction hole 19 of the fixed scroll 11 overlaps the first working chamber 34 in the suction process
• another part an outer part in the radius direction of the driving shaft 13
• the suction hole 19 of the fixed scroll 11 is in direct communication with the first working chamber 34 in the suction process from a part of the opening 19a, and is in communication with the first working chamber 34 in the suction process through the first suction flow path 35 from another part of the opening 19a.
• a suction loss can be reduced as compared with a case where the suction hole 19 of the fixed scroll 11 is not in direct communication with the first working chamber 34 in the suction process.
• the suction hole 19 of the fixed scroll 11 does not overlap the end on the winding end side (the outer end in the winding direction) of the tip seal 30 inserted into the groove 29 of the wrap 26 of the orbiting scroll 12, but intermittently overlaps another part of the tip seal 30 (see FIG. 5 ). Therefore, unlike a case where the suction hole 19 of the fixed scroll 11 overlaps the end of the tip seal 30, falling off of the tip seal 30 from the groove 29 of the wrap 26 can be prevented.
• the opening 19a of the suction hole 19 of the fixed scroll 11 has been described as an example of a case where it has a trapezoidal shape, but the present invention is not limited thereto.
• the opening 19a of the suction hole 19 of the fixed scroll 11 may have a comb-shape branched in the winding direction of the wrap.
• the area where the opening 19a overlaps the tip seal 30 inserted into the groove 29 of the wrap 26 of the orbiting scroll 12 is made small, and falling off of the tip seal 30 from the groove 29 of the wrap 26 can be further prevented.
• the suction hole 19 of the fixed scroll 11 has been described as an example of a case where it has one opening 19a that opens on one surface of the end plate 17, but the present invention is not limited thereto.
• the suction hole 19 of the fixed scroll 11 may have a plurality of openings 19b and 19c that opens on one surface of the end plate 17 and is separated from each other.
• the openings 19b and 19c of the suction hole 19 of the fixed scroll 11 do not overlap the first working chamber 34 in the suction process. Therefore, the suction hole 19 of the fixed scroll 11 is in communication with the first working chamber 34 in the suction process through the first suction flow path 35 from the openings 19b and 19c.
• the opening 19b of the suction hole 19 of the fixed scroll 11 overlaps the first working chamber 34 in the suction process, and the opening 19c does not overlap the first working chamber 34 in the suction process. Therefore, the suction hole 19 of the fixed scroll 11 is in direct communication with the first working chamber 34 in the suction process from the opening 19b, and is in communication with the first working chamber 34 in the suction process through the first suction flow path 35 from the opening 19c.
• a suction loss can be reduced as compared with a case where the suction hole 19 of the fixed scroll 11 is not in direct communication with the first working chamber 34 in the suction process.
• the area where the openings 19b and 19c overlap the tip seal 30 inserted into the groove 29 of the wrap 26 of the orbiting scroll 12 is made small, and falling off of the tip seal 30 from the groove 29 of the wrap 26 can be further prevented.
• the present invention is applied to the scroll-type compressor that is one of scroll-type fluid machines as an example, but the present invention is not limited thereto.
• the present invention may be applied to other scroll-type fluid machines (specifically, a scroll-type vacuum pump, a scroll-type expansion machine, and the like).

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

Applications Claiming Priority (1)

Publications (1)

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ID=92674559

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• 2023
  • 2023-03-09 EP EP23926338.7A patent/EP4678917A1/fr active Pending
  • 2023-03-09 CN CN202380056142.7A patent/CN119604683A/zh active Pending
  • 2023-03-09 WO PCT/JP2023/009060 patent/WO2024185128A1/fr not_active Ceased
  • 2023-03-09 JP JP2025505032A patent/JP7795685B2/ja active Active

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