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
  • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
  • F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
  • F01C17/00—Arrangements for drive of co-operating members, e.g. for rotary piston and casing
  • F01C17/06—Arrangements for drive of co-operating members, e.g. for rotary piston and casing using cranks, universal joints or similar elements
  • F01C17/063—Arrangements for drive of co-operating members, e.g. for rotary piston and casing using cranks, universal joints or similar elements with only rolling movement
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
  • F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
  • F04C18/02—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents
  • F04C18/0207—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents both members having co-operating elements in spiral form
  • F04C18/0246—Details concerning the involute wraps or their base, e.g. geometry
  • F04C18/0253—Details concerning the base
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
  • F04C23/00—Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids
  • F04C23/008—Hermetic pumps

Definitions

• the present invention relates to a scroll compressor and in particular relates to an anti-rotation mechanism for preventing rotation of a movable scroll.
• scroll compressors comprising an anti-rotation mechanism for preventing rotation of a movable scroll on itself, without impeding orbiting of the movable scroll in relation to a fixed scroll fixed to a housing.
• Anti-rotation mechanisms furthermore include what are known as pin-and-ring anti-rotation mechanisms (pin & ring anti-rotation mechanisms), comprising multiple sets of anti-rotation pins (also referred to below simply as “pins”) and restricting rings (also referred to below simply as “rings”).
• pin & ring anti-rotation mechanisms comprising multiple sets of anti-rotation pins (also referred to below simply as “pins”) and restricting rings (also referred to below simply as “rings”).
• An axial clearance is formed between the force receiving plate and a face radially inward from the sliding face.
• the face radially inward from the sliding face (referred to below as a “retreat face") is positioned with a step that becomes lower from the sliding face to the spiral wall side.
• a plurality of bottomed recesses (corresponding to ring mating portions) disposed uniformly along a predetermined pitch circle are formed in this "retreat face". Rings engaging with pins fixed to the housing are mated in these recesses.
• a clearance sufficient to allow the movable scroll to orbit in a predetermined radius of revolution is present between outer circumferential surfaces of the plurality of pins and inner circumferential surfaces of the plurality of rings, and rotation (rotation on itself) of the movable scroll is prevented as a result of the plurality of pins engaging with the plurality of rings, and a known anti-rotation mechanism is constructed by this means.
• the length of the rings is greater than the depth of the recesses. Furthermore, there is also a known configuration in which the length of the rings is smaller than the depth of the recesses, as can be seen as prior art in Patent Document 1.
• the mating between the rings and the recesses is preferably what is known as a clearance fit, with a slight clearance rather than a press-fit.
• the rings are fitted in the recesses by means of a clearance fit, so it is possible to eliminate the risk of deformation of the movable scroll or the housing which would be caused by a press-fit.
• the present invention has been devised to solve the problems above, and the objective thereof lies in providing technology to prevent the phenomenon of tilting of rings in relation to ring mating portions in a pin-and-ring anti-rotation mechanism.
• the present invention provides a scroll compressor comprising: a housing (20); a partition member (30) fixed inside the housing (20); an accommodating space (25) defined by the partition member (30) inside the housing (20); a fixed scroll (70) and a movable scroll (80) accommodated in combination inside the accommodating space (25); and an anti-rotation mechanism (120) for preventing rotation of the movable scroll (80) on itself, characterized in that
• the rings are thus mated with a clearance fit in relation to the inner circumferential surface of the ring mating portions. Consequently, there is a minute gap (clearance) between the inner circumferential surface of the ring mating portions and the outer circumferential surface of the rings.
• the retreat portion is formed on the inner circumferential surface of the rings. It is therefore possible to prevent the phenomenon of tilting of the rings in relation to the ring mating portions by setting the position at which force is transmitted between the anti-rotation pins and the rings away from the end face of the rings.
• the boundary (145b) is positioned further to the bottom face (132) side of the ring mating portions (130) than the opening-side edge (135) of the inner circumferential surface (131) of the ring mating portions (130).
• the retreat portion (145) is configured by a tapering surface which decreases in diameter from the second end face (143) toward the far side of the rings (140).
• the retreat portion (145; 245) is formed only on the second end face (143) side of the rings (140; 240).
• the rings (140; 240) are provided with a reverse-assembly preventing portion (160) for preventing the rings (140) from being assembled the opposite way round with the ring mating portions (130).
• retreat portions (145, 245) are formed along the whole circumference of the inner circumferential surface (144) of the rings (340) on both axial end faces (142, 143) of the rings (340).
• the present invention makes it possible to prevent the phenomenon of tilting of rings in relation to ring mating portions in a pin-and-ring anti-rotation mechanism.
• rotation of the drive shaft 51 enables the center of the movable scroll 80 to orbit with a preset eccentric radius (eccentric rotation) via the bush 55 and third bearing 57 mated with the eccentric shaft 54.
• a thrust member 101 capable of receiving a thrust load resulting from a compression reaction force is preferably interposed between the flat face 31a of the partition plate portion 31 and the second plate face 81b of the movable scroll 80.
• the thrust member 101 is configured by a thin plate-shaped annular thrust race, for example.
• the thrust member 101 is also referred to below as the "thrust race 101", as appropriate.
• the thrust race 101 comprises a material having excellent wear resistance, and can be sandwiched between the flat face 31a of the partition plate portion 31 and a tip end face of the cylindrical outer circumferential wall 72 of the fixed scroll 70.
• the bevel portion 134 may or may not be present. When the bevel portion 134 is not present, the opening-side edge 135 of the inner circumferential surface 131 is aligned with the opening end 133 of the ring mating portions 130.
• a depth (first depth) from the sliding face 111 to the opening-side edge 135 of the inner circumferential surface 131 of the ring mating portions 130 is D1.
• a depth (second depth) from the edge 135 to the bottom face 132 is D2, which is greater than the first depth D1.
• the rings 140 are cylindrical members with a circular penetration which are mated with a "clearance fit" (mated with play) in relation to the ring mating portions 130.
• the extent of the clearance fit is preferably such that an outer circumferential surface 141 of the rings 140 mated with the inner circumferential surface 131 of the ring mating portions 130 is capable of axial sliding, rotational movement, and removal, and such that there is a small maximum gap (clearance).
• the thickness of the rings 140 is uniform over the circumferential direction thereof.
• first end face 142 An end face 142 of the rings 140 on the side facing the bottom face 132 of the ring mating portions 130 when the rings 140 are mated with the ring mating portions 130 will be referred to as the "first end face 142", and an end face 143 on the opposite axial side to the first end face 142 will be referred to as the "second end face 143".
• the first end face 142 and the second end face 143 are parallel to each other and are also parallel to the bottom face 132 of the ring mating portions 130.
• a retreat portion 145 that does not contact the pins 150 is provided on the rings 140 along the whole circumference on at least one axial end 143 side (second end face 143 side) of the inner circumferential surface 144.
• the retreat portion 145 is formed only on the second end face 143 side of the rings 140, as shown in fig. 5 .
• the retreat portion 145 is configured by a circumferential surface positioned radially outward from the inner circumferential surface 144 along the whole circumference of the inner circumferential surface 144 of the rings 140.
• the retreat portion 145 will also be referred to as the "circumferential surface 145", as appropriate.
• the end point 145b is positioned at a boundary of the inner circumferential surface 144 and the circumferential surface 145 (retreat portion 145) of the rings 140.
• the end point 145b will also be referred to as the "boundary 145b", as appropriate.
• the boundary 145b is positioned further to the bottom face 132 side of the ring mating portions 130 than the opening-side edge 135 of the inner circumferential surface 131 of the ring mating portions 130. That is to say, the distance L1 (length L1 of the retreat portion 145) from the flat face 31a to the boundary 145b is longer than the distance D1 (first depth D1) from the flat face 31a to the opening-side edge 135 of the inner circumferential surface 131 of the ring mating portions 130.
• the pins 150 have a cantilever structure with said one end portion 151 fixed to the partition member 30.
• the inner circumferential surface 144 of the rings 140 makes linear contact with said other end portion 152 (free end 152) of the pins 150.
• Said other end portion 152 takes the load acting from the inner circumferential surface 144 of the rings 140.
• said other end portion 152 of the pins 150 may elastically deform, as shown by the imaginary line, for example.
• the boundary 145b receives a reaction force fr from the pins 150.
• the reaction force fr has the opposite orientation to the direction of orbiting of the movable scroll 80 (the direction of the arrow Ru).
• the rings 140 that have received the reaction force fr attempt to collapse in the radial direction of the ring mating portions 130 (direction of the arrow Tr), with the opening-side edge 135 of the ring mating portions 130 as a support point. In this state, however, the outer circumferential surface 141 of the rings 140 is touching the inner circumferential surface 131 of the ring mating portions 130 in the direction in which the reaction force fr is exerted.
• the opposing face 81b comprises: the annular sliding face 111 which is provided on the outermost circumference and is capable of sliding in relation to the flat face 31a of the partition member 30; and the retreat face 112 positioned radially inside the sliding face 111 and at a predetermined depth from the sliding face 111.
• the anti-rotation mechanism 120 comprises: the ring mating portions 130 indented from the retreat face 112 along a direction orthogonal to the sliding face 111 of the movable scroll 80; the cylindrical rings 140 mated with a clearance fit in relation to the ring mating portions 130; and the anti-rotation pins 150 extending from the flat face 31a of the partition member 30 into the rings 140 so as to be capable of contacting the inner circumferential surface 144 of the rings 140.
• the rings 140 have the first end face 142 disposed on the far side of the ring mating portions 130, and the second end face 143 on the opposite side to the first end face 142 in the axial direction, and the retreat portion 145 that does not contact the anti-rotation pins 150 is provided along the whole circumference on at least the second end face 143 side of the inner circumferential surface 144.
• the retreat portions 145, 245 are thus formed along the whole circumference of the inner circumferential surface 144 of the rings 340 on both axial end faces 142, 143 of the rings 340. It is therefore possible to prevent the phenomenon of tilting of the rings 340 in relation to the ring mating portions 130, even if the rings 340 are assembled in the opposite direction in relation to the ring mating portions 130 (see fig. 5 ).
• the scroll compressor 300 according to example 3 is capable of demonstrating the same effects as the scroll compressor 10 of example 1 above, in addition to the effects of examples 2 and 3.
• the scroll compressors 10, 200, 300 are not limited to horizontal electric compressors, and may equally be configured so that the drive shaft 51 is driven by means of an external motive power source.
• the exemplary scroll compressors 10, 200, 300 from any two or more of the examples may be combined.

Landscapes

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

Applications Claiming Priority (2)

Publications (1)

Family

ID=90191034

Family Applications (1)

Country Status (4)

Family Cites Families (4)

• 2023
  • 2023-08-31 JP JP2024545621A patent/JPWO2024053541A1/ja active Pending
  • 2023-08-31 WO PCT/JP2023/031727 patent/WO2024053541A1/fr not_active Ceased
  • 2023-08-31 CN CN202380064523.XA patent/CN119768612A/zh active Pending
  • 2023-08-31 EP EP23863079.2A patent/EP4585805A1/fr active Pending

Also Published As

Similar Documents

Legal Events