EP2096311A1 - Vorrichtung und verfahren zum positionieren einer fixen spirale - Google Patents

Vorrichtung und verfahren zum positionieren einer fixen spirale Download PDF

Info

Publication number
EP2096311A1
EP2096311A1 EP07851096A EP07851096A EP2096311A1 EP 2096311 A1 EP2096311 A1 EP 2096311A1 EP 07851096 A EP07851096 A EP 07851096A EP 07851096 A EP07851096 A EP 07851096A EP 2096311 A1 EP2096311 A1 EP 2096311A1
Authority
EP
European Patent Office
Prior art keywords
fixed scroll
scroll
axis direction
wrap
orbiting
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP07851096A
Other languages
English (en)
French (fr)
Other versions
EP2096311A4 (de
Inventor
Takashi Hirouchi
Toshihiro Susa
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Daikin Industries Ltd
Original Assignee
Daikin Industries Ltd
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 Daikin Industries Ltd filed Critical Daikin Industries Ltd
Publication of EP2096311A1 publication Critical patent/EP2096311A1/de
Publication of EP2096311A4 publication Critical patent/EP2096311A4/de
Withdrawn legal-status Critical Current

Links

Images

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
    • F04C2230/00—Manufacture
    • F04C2230/60—Assembly methods
    • F04C2230/603—Centering; Aligning
    • 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
    • F04C2230/00—Manufacture
    • F04C2230/60—Assembly methods
    • F04C2230/604—Mounting devices for pumps or compressors
    • 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
    • F04C2240/00—Components
    • F04C2240/80—Other components
    • F04C2240/81—Sensor, e.g. electronic sensor for control or monitoring
    • 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
    • F04C2270/00—Control; Monitoring or safety arrangements
    • F04C2270/86—Detection
    • 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 apparatus and method for positioning a fixed scroll in assembling a scroll fluid machinery.
  • scroll fluid machineries have been widely used in compressors and the like for compressing refrigerant in refrigerant circuits in air conditioners and the like.
  • spiral wraps are provided to a fixed scroll and an orbiting scroll so that the fixed scroll wrap and the orbiting scroll wrap are meshed with each other to form fluid chambers.
  • the orbiting scroll revolves to cause change in volume of the fluid chambers. For example, in a scroll compressor, after the fluid is sucked into fluid chambers before the fluid chambers are in a closed state, the fluid chambers in the closed state reduce in their volume to compress the fluid in the fluid chambers, and the fluid is discharged when the fluid chambers are connected to a discharge port.
  • the orbiting scroll revolves with the wrap thereof meshed with the fixed scroll wrap. If the orbiting scroll wrap strikes the fixed scroll wrap hard when the orbiting scroll revolves, the orbiting scroll moves awkwardly. Therefore, for moving the orbiting scroll smoothly, it is necessary to arrange the fixed scroll accurately at a position where the wrap of the revolving orbiting scroll strikes the fixed scroll wrap not so hard (a position where a minute clearance that allows a film of the lubricant oil to form between the wraps is formed all the time when the orbiting scroll revolves). For this reason, it is required to position the fixed scroll accurately in assembling a scroll fluid machinery. For accurately positioning the fixed scroll, methods and apparatuses are disclosed, for example, in Patent Document 1.
  • an assembly is prepared which is an integrated combination of an orbiting scroll, a crank shaft engaged therewith, and a housing member forming a bearing for the crank shaft. Then, the orbiting scroll of the assembly is meshed with a fixed scroll, and the crank shaft is rotated by a motor in this state. Next, variation in torque necessary for rotating the crank shaft is detected, and the contact degree and the contact direction (contact point) between the orbiting scroll and the fixed scroll are computed based on the detection result. Then, the distance and the direction in which the fixed scroll is to be moved are computed according to the contact degree and the contact direction between the orbiting scroll and the fixed scroll.
  • Patent Document 1 Japanese Unexamined Patent Application Publication 2006-207528
  • a guide is provided which allows movement of the fixed scroll parallel to the X-axis direction and the Y-axis direction and restricts rotation of the fixed scroll by its frictional force, and the fixed scroll is pushed to the housing member with the guide interposed. With the frictional force exerted, when the fixed scroll receives the impact force, the fixed scroll is moved principally in parallel with its rotation restricted.
  • the impact force When the impact force is applied, however, to the fixed scroll in the direction in which the contact force increases in the state that the fixed scroll wrap is in contact with the orbiting scroll wrap (for example, the impact force is applied from a unit (70) on the right side in the state shown in FIG. 25 ), the impact force exceeds the frictional force to invite the fixed scroll to rotate even under restriction of rotation thereof. Rotation of the fixed scroll leads to inaccurate positioning of the fixed scroll.
  • the frictional force exceeds the impact force to cause the fixed scroll to be immovable in the X-axis direction and the Y-axis direction.
  • the present invention has been made in view of the foregoing and has its object of increasing the positioning accuracy by definitely preventing rotation of the fixed scroll in positioning the fixed scroll by moving it in the X-axis direction and the Y-axis direction in assembling a scroll fluid machinery.
  • a first aspect of the present invention provides a positioning apparatus for positioning, in a process for assembling a scroll fluid machinery (10), a fixed scroll (34) on the basis of a positional relationship between a fixed scroll wrap (35) included in the fixed scroll (34) and an orbiting scroll wrap (32) included in an orbiting scroll (34), which includes: a fixing member (63) fixing an assembly (11) as an integrated combination of the orbiting scroll (31), a crank shaft (20) engaged with the orbiting scroll (31), and a housing member (36) composing a bearing for the crank shaft (20); a phase detection mechanism (90) detecting a phase or a rotation angle of the orbiting scroll (31); a position detection mechanism (65) detecting a position of the fixed scroll (34); a moving mechanism moving the fixed scroll (34) meshed with the orbiting scroll (31); and control means (80) controlling the moving mechanism (75) on the basis of a contact state of the fixed scroll wrap (35) and the orbiting scroll wrap (32).
  • the control means includes a controller (80) which determines a direction in which the fixed scroll (34) is to be moved on the basis of the phase or the rotation angle of the orbiting scroll (31) detected by the phase detection mechanism (90) and which controls the position detection mechanism (65) to perform position detection at plural points to determine a center of the fixed scroll (34) for positioning the fixed scroll (34), the position detection being detection that in a part of the fixed scroll (34) where the outer peripheral face of the fixed scroll wrap (35) separates from the inner peripheral face of the orbiting scroll wrap (32) in movement of the fixed scroll (34) by the moving mechanism (75), when the fixed scroll (34) is pushed back against the orbiting scroll wrap (32) by contact of an outer peripheral face of the orbiting scroll wrap (32) with an inner peripheral face of the fixed scroll wrap (35) upon inversion of the orbiting scroll (31) after the fixed scroll (34) is moved, the position detection mechanism (65) detects a position of the part as a contact point of the wraps (32, 35).
  • the part of the fixed scroll (34) where the outer peripheral face of the fixed scroll rap (35) separates from the inner peripheral face of the orbiting scroll wrap (32) in movement of the fixed scroll (34) by the moving mechanism (75) ranges to some extent
  • the part preferably means a predetermined part where the wraps (32, 35) in contact with each other or forming a minimum space therebetween separate from each other. Whether or not the wraps (32, 35) are in contact with each other may be judged from displacement of the fixed scroll (34) after inversion of the orbiting scroll (32), namely, after the orbiting scroll (32) is rotated at 180° or larger.
  • control means (controller) (80) controls the moving mechanism (75) in the state that the assembly (11) is fixed to the positioning apparatus to position the fixed scroll (34).
  • the phase detection mechanism (90) detects the phase (the rotation angle) of the orbiting scroll (31) first to recognize the positional relationship between the fixed scroll wrap (35) and the orbiting scroll wrap (32). Then, the moving mechanism (75) is operated to move the fixed scroll (34) in the direction in which the outer peripheral face of the fixed scroll wrap (35) separates from the inner peripheral face of the orbiting scroll wrap (32) in the predetermine part (hereinafter referred to it for short as a direction in which the wraps (32, 35) separate from each other), and then, the orbiting scroll is inverted.
  • the position detection mechanism (65) detects the contact between the wraps (32, 35) (the contact between the outer peripheral face of the orbiting scroll wrap (32) and the inner peripheral face of the fixed scroll wrap (35)).
  • the fixed scroll (34) is pushed back against the orbiting scroll wrap (32) to shift, of which state is judged as contact between the wraps (32, 35).
  • the fixed scroll (34) shifts it is judged that the wraps (32, 35) are out of contact with each other yet, and accordingly, the movement of the fixed scroll (34) in the aforementioned direction and the inversion of the orbiting scroll (31) are repeated until the wraps (32, 35) are in contact with each other.
  • the fixed scroll (34) is moved microns by microns of approximately several microns to 10 microns, for example.
  • the same operation is performed at plural points to thus obtain the center of the fixed scroll (34), and accordingly, the moving mechanism (75) moves the fixed scroll to the thus obtained center.
  • a second aspect of the present invention is an aspect according to the first aspect, wherein the moving mechanism (75) includes a striking unit (70) moving the fixed scroll (34) by applying impact force to the fixed scroll (34) in a state that the fixed scroll (34) is pressed to the housing member (36).
  • the moving mechanism (75) includes a striking unit (70) moving the fixed scroll (34) by applying impact force to the fixed scroll (34) in a state that the fixed scroll (34) is pressed to the housing member (36).
  • the fixed scroll (34) receives the impact force from the striking unit (70) to be moved.
  • the impact force is applied by the striking unit (70) to the fixed scroll (34) with the fixed scroll (34) pressed to the housing member (36)
  • the fixed scroll (34) is moved by a minute distance.
  • a third aspect of the present invention is an aspect according to the first or second aspect, wherein the moving mechanism (75) moves the fixed scroll (34) while the orbiting scroll (31) is rotated.
  • the phase detection mechanism (90) detects the rotation angle of the orbiting scroll (31) with the orbiting scroll (31) rotated, and movement of the fixed scroll (34) in the direction in which the wraps (32, 35) separate from each other and inversion of the orbiting scroll (31) thereafter are performed. This operation is performed at plural points to compute a plurality of contact points of the wraps (32, 35) for positioning the fixed scroll (34).
  • a fixed scroll positioning apparatus further includes: a guide (41) allowing parallel movement of the fixed scroll (34) in an X-axis direction and a Y-axis direction, which intersect at a right angle with each other, with posture of the fixed scroll (34) unchanged, wherein the X-axis direction and the Y-axis direction in which the guide (41) allows to the fixed scroll (34) to be moved agree with directions in which the moving mechanism (75) applies moving force (impact force) to the fixed scroll (34).
  • the X-axis direction and the Y-axis direction in which the guide (41) allows the fixed scroll (34) to be moved agree with the directions of the moving force that the moving mechanism (75) applies to the fixed scroll (34). Therefore, in combination thereof with the movement of the fixed scroll (34) in the direction in which the wraps (32, 35) separates from each other, the fixed scroll (34) is prevented definitely from being rotated.
  • a fifth aspect of the present invention is an aspect according to the fourth aspect, wherein the moving mechanism (75) moves the fixed scroll (34) in the X-axis direction, the Y-axis direction, and the X-axis direction in this order for positioning.
  • the fixed scroll (34) is centered in the X-axis direction first, in the Y-axis direction next, and in the X-axis direction again to thus position the fixed scroll (34).
  • a sixth aspect of the present invention is an aspect according to the fourth or fifth aspect, wherein after the position detection mechanism (65) detects each end of respective movable ranges in the X-axis direction and the Y-axis direction of the fixed scroll (34), the moving mechanism (75) positions the fixed scroll (34) at respective centers of the movable ranges.
  • the fixed scroll (34) is positioned at the respective centers of the movable ranges.
  • a seventh aspect of the present invention is an aspect according to any one of the first to sixth aspect, wherein a lubricant oil used for movable elements of the assembly (11) has viscosity lower than a refrigerator oil for the scroll fluid machinery (10) after assembled.
  • the oil is supplied to the bearing non-uniformly especially at low outdoor temperature to cause non-uniform thickness of the oil film formed at low rotational speed, thereby inviting assembling with the center of the crank shaft (20) displaced.
  • the use of the oil having low viscosity prevents displacement of the crank shaft at assembling.
  • An eighth aspect of the present invention provides a method for positioning, in a process for assembling a scroll fluid machinery (10), a fixed scroll (34) on the basis of a positional relationship between a fixed scroll wrap (35) included in the fixed scroll (34) and an orbiting scroll wrap (32) included in an orbiting scroll (34), which includes: a fixing step of fixing an assembly (11) which is an integrated combination of the orbiting scroll (31), a crank shaft (20) engaged with the orbiting scroll (31), and a housing (36) composing a bearing for the crank shaft (20) and in which the fixed scroll (31) and the orbiting scroll (34) are meshed with each other; and a positioning step of adjusting a position of the fixed scroll (34) on the basis of a contact state of the fixed scroll wrap (35) and the orbiting scroll wrap (32) after the fixing step.
  • a direction in which the fixed scroll (34) is to be moved is determined on the basis of a phase or a rotation angle of the orbiting scroll (31); and the position detection is performed at plural points for determining a center of the fixed scroll (34), the position detection being detection that in part of the fixed scroll (34) where the outer peripheral face of the fixed scroll wrap (35) separates from the inner peripheral face of the orbiting scroll wrap (32) in movement of the fixed scroll (34), when the fixed scroll (34) is pushed back against the orbiting scroll wrap (32) by contact of an outer peripheral face of the orbiting scroll wrap (32) with an inner peripheral face of the fixed scroll wrap (35) upon inversion of the orbiting scroll (31) after the fixed scroll (34) is moved, a position of the part is detected as a contact point of the wraps (32, 35).
  • the part of the fixed scroll (34) where the outer peripheral face of the fixed scroll rap (35) separates from the inner peripheral face of the orbiting scroll wrap (32) in movement of the fixed scroll (34) by the moving mechanism (75) ranges to some extent
  • the part preferably means a predetermined part where the wraps (32, 35) in contact with each other or forming a minimum space therebetween separate from each other. Whether or not the wraps (32, 35) are in contact with each other may be judged from displacement of the fixed scroll (34) after inversion of the orbiting scroll (32), namely, after the orbiting scroll (32) is rotated at 180° or larger.
  • the phase (the rotation angle) of the orbiting scroll (31) is detected first so that the positional relationship between the fixed scroll wrap (35) and the orbiting scroll wrap (32) is recognized. Then, the fixed scroll (34) is moved in the direction in which the outer peripheral face of the fixed scroll wrap (35) separates from the inner peripheral face of the orbiting scroll wrap (32) (the direction in which the wraps (32, 35) separate from each other) in the predetermine part, and then, the orbiting scroll is inverted.
  • the contact between the wraps (32, 35) (the contact between the outer peripheral face of the orbiting scroll wrap (32) and the inner peripheral face of the fixed scroll wrap (35)) is detected from shift of the fixed scroll (34) caused by push back by the orbiting scroll wrap (32).
  • the fixed scroll (34) shifts which means that the wraps (32, 35) are out of contact with each other yet, movement of the fixed scroll (34) in the aforementioned direction and inversion of the orbiting scroll (31) are repeated until the wraps (32, 35) are in contact with each other.
  • the same operation is performed at plural points to thus obtain the center of the fixed scroll (34), and accordingly, the fixed scroll is positioned at the thus obtained center.
  • a ninth aspect of the present invention is an aspect according to the eighth aspect, wherein in the positioning step, the fixed scroll (34) is moved in parallel to an X-axis direction and a Y-axis direction, which are intersected at a right angle with each other, with posture of the fixed scroll (34) unchanged.
  • the movement of the fixed scroll (34) is limited to the X-axis direction and the Y-axis direction for positioning the fixed scroll (34), and therefore, casual rotation of the fixed scroll (34) can be prevented.
  • a tenth aspect of the present invention is an aspect according to the ninth aspect, wherein in the positioning step, the fixed scroll (34) is moved in the X-axis direction, the Y-axis direction, and the X-axis direction in this order.
  • the fixed scroll (34) is centered in the X-axis direction once, in the Y-axis direction next, and in the X-axis direction again to thus position the fixed scroll (34).
  • An eleventh aspect of the present invention is an aspect according to the ninth or tenth aspect, wherein in the positioning step, after each end of respective movable ranges in the X-axis direction and the Y-axis direction of the fixed scroll (34) is detected, the fixed scroll (34) is positioned at respective centers of the movable ranges.
  • the fixed scroll (34) is positioned at the respective centers of the movable ranges.
  • a twelfth aspect of the present invention is an aspect according to the eleventh aspect, wherein the positioning step includes a first centering step, a second centering step, and a third centering step, which are performed in this order, the first centering step includes the steps of: detecting, as a first contact point in the X-axis direction, a point where the fixed scroll wrap (35) and the orbiting scroll wrap (32) are made in contact with each other by repetition of movement of the fixed scroll (34) in a first direction on the X-axis and inversion of the orbiting scroll (31); detecting, as a second contact point in the X-axis direction, a point where the fixed scroll wrap (35) and the orbiting scroll wrap (32) are made in contact with each other by repletion of movement of the fixed scroll (34) in a second direction on the X-axis and inversion of the orbiting scroll (31); and positioning then the fixed scroll (34) at a center between the first contact point and the second contact point, the second centering step includes the steps of:
  • the first centering step centers the fixed scroll (34) once at the center of the movable range on the X-axis
  • the second centering step centers it then at the center of the movable range on the Y-axis on the center on the X-axis
  • the third centering step adjusts the fixed scroll (34) at the more accurate point of the center on the X-axis.
  • a thirteenth aspect of the present invention is an aspect according to any one of the eighth to twelfth aspects, wherein in the positioning step, the fixed scroll (34) is positioned with the orbiting scroll (31) rotated. Specifically, the orbiting scroll (31) is rotated even during the time when the fixed scroll (34) is moved, and the phase of the rotated orbiting scroll (31) is detected to judge the movement timing and the position detection timing for positioning the fixed scroll (34).
  • the phase of the orbiting scroll (31) is detected with the orbiting scroll (31) rotated. Then, when the direction in which the wraps (32, 35) separate from each other agrees with the direction in which the fixed scroll (34) is to be moved in rotating the orbiting scroll (31), the fixed scroll (34) is moved. Further, operation for detecting the position of the fixed scroll (34) is performed in a region opposite to the part where the wraps (32, 35) separate from each other. Doing the above operation plural times leads to the result that the fixed scroll (34) is positioned.
  • the orbiting scroll wrap (32) may push back the fixed scroll (34) to cause the fixed scroll (34) to shift.
  • the position detection mechanism (65) detects the shift, it is judged that the wraps (32, 35) are in contact with each other. The position detection is performed at plural points to determine the center of the fixed scroll (34) for positioning the fixed scroll (34).
  • the fixed scroll (34) In movement of the fixed scroll (34), the fixed scroll (34) is moved in the direction in which the wraps (32, 35) separate from each other, and therefore, rotation of the fixed scroll (34) by receiving the impact force in the direction in which the contact force of the wraps (32, 35) increases is prevented.
  • the center of the fixed scroll (34) can be obtained more accurately than in the conventional one to thus position the fixed scroll (34) at the thus obtained center accurately.
  • the striking unit (70) applies the impact force to the fixed scroll (34) with the fixed scroll (34) pressed to the housing member (36). This moves the fixed scroll (34) by a minute distance to achieve precise positioning of the fixed scroll (34).
  • the phase of the orbiting scroll (31) is detected with the orbiting scroll (31) rotated. Then, when the direction in which the wraps (32, 35) separate from each other agrees with the direction in which the fixed scroll (34) is to be moved in rotating the orbiting scroll (31), the fixed scroll (34) is moved. Further, operation for detecting the position of the fixed scroll (34) is performed plural times in a region opposite to the part where the wraps (32, 35) separate from each other. Whereby, the fixed scroll (34) is positioned. Specifically, the fixed scroll (34) is moved in the region where striking (movement) is capable and the position of the fixed scroll (34) is detected in the other region for judging the contact between the wraps (32, 35).
  • the X-axis direction and the Y-axis direction in which the guide (41) allows the fixed scroll (34) to be moved agree with the directions of the moving force that the moving mechanism (75) applies to the fixed scroll (34). Therefore, in combination thereof with the movement of the fixed scroll (34) in the direction in which the wraps (32, 35) separate from each other, the fixed scroll (34) is prevented definitely from being rotated. Hence, the positioning accuracy increases further.
  • the fixed scroll (34) is centered once in the X-axis direction first, in the Y-axis direction next, and in the X-axis direction again to thus position the fixed scroll (34).
  • the first centering operation in the X-axis direction which is performed with no center in the Y-axis direction obtained yet, may not be necessarily accurate.
  • the fixed scroll (34) can be positioned accurately.
  • the fixed scroll (34) is positioned at the respective centers of the movable ranges. Accordingly, the fixed scroll (34) can be positioned accurately by computing the center on the X-axis and the center on the Y-axis.
  • the center of the fixed scroll (34) is set at the respective centers of the movable ranges after each end in the respective movable ranges in the X-axis direction and the Y-axis direction of the fixed scroll (34) is detected, so that the fixed scroll (34) can be positioned accurately.
  • the oil having viscosity lower than refrigerator oil for the scroll fluid machinery (10) after assembled is used as the lubricant oil for the movable elements of the assembly (11). This prevents displacement of the center of the crank shaft in the assembling process.
  • the orbiting scroll wrap (32) may push back the fixed scroll (34) to cause the fixed scroll (34) to shift.
  • the shift it is judged that the wraps (32, 35) are in contact with each other. This operation is performed at plural points to determine the center of the fixed scroll (34) for positioning the fixed scroll (34).
  • the fixed scroll (34) is moved in the direction in which the wraps (32, 35) separate from each other, and therefore, rotation of the fixed scroll (34) by receiving the impact force in the direction in which the contact force of the wraps (32, 35) increases is prevented.
  • the center of the fixed scroll (34) can be obtained more accurately than in the conventional one to thus position the fixed scroll (34) at the thus obtained center accurately.
  • the movement of the fixed scroll (34) is limited to the X-axis direction and the Y-axis direction for preventing casual rotation of the fixed scroll (34), and accordingly, the fixed scroll (34) can be positioned accurately.
  • the fixed scroll (34) is centered in the X-axis direction first, in the Y-axis direction next, and in the X-axis direction again to thus position the fixed scroll (34).
  • the first centering operation in the X-axis direction which is performed with no center in the Y-axis direction obtained yet, may not be necessarily accurate.
  • the fixed scroll (34) can be positioned accurately.
  • the fixed scroll (34) is positioned at the respective centers of the movable ranges. Hence, accurate computation of the centers on the X-axis and the Y-axis leads to accurate positioning of the fixed scroll (34).
  • the first centering step centers the fixed scroll (34) once at the center of the movable range on the X-axis
  • the second centering step centers it at the center of the movable range on the Y-axis along the center on the X-axis
  • the third centering step adjusts the fixed scroll (34) at the more accurate point of the center on the X-axis.
  • the fixed scroll (34) can be positioned accurately.
  • the phase of the orbiting scroll (31) is detected with the orbiting scroll (31) rotated, and movement of the fixed scroll (34) in the direction in which the wraps (32, 35) separate from each other and inversion of the orbiting scroll (31) are performed at plural points, thereby positioning the fixed scroll (34). Positioning of the fixed scroll (34) during rotation of the orbiting scroll (1) shortens the cycle time for positioning.
  • the scroll compressor (10) is of generally-called hermetic type.
  • the scroll compressor (10) includes a casing (15) formed of an oblong hermetic container.
  • the casing (15) is composed of one body member (16) formed in an oblong cylindrical shape and cup-shaped heads (17, 18) mounted at the upper end and the lower end of the body member (16).
  • a lower bearing member (23), a compressor motor (25), a compression mechanism (30) are arranged in this order from the bottom to the above.
  • a vertically extending crank shaft (20) is also provided inside the casing (15).
  • a suction pipe (11) passing through the upper head (17) is fixed at the casing, (15) so as to communicate with the suction port of the compression mechanism (30). Further, a discharge pipe (12) passing through the body member (16) is provided at a part of the casing (15) between the compression mechanism (30) and the compressor motor (25). Low-pressure gas is sucked into the compression mechanism (30) through the suction pipe (11), is compressed in the compression mechanism (30) to be high-pressure gas, fills the space in the lower part of the compression mechanism (30) in the casing (15), and is then discharged from the discharge pipe (12).
  • the upper space (S1) of the compression mechanism (20) serves as a low-pressure space while the lower space (S2) thereof serves as a high-pressure space.
  • the crank shaft (20) includes a main shaft portion (21) and an eccentric portion (22).
  • the main shaft portion (21) has an upper end part of which diameter is slightly larger than that of the lower part thereof.
  • the eccentric portion (22) is in a column shape having a diameter smaller than that of the upper end part of the main shaft portion (21) and stands on the upper end face of the main shaft portion (21).
  • the axial center of the eccentric portion (22) is eccentric from the axial center of the main shaft part (21).
  • the lower bearing member (23) is fixed in the vicinity of the lower end of the body member (16) of the casing (15).
  • a sliding bearing (23a) is formed at the central part of the lower bearing member (23) to support the lower end of the main shaft portion (21) rotatably.
  • the compressor motor (25) is a generally-called brushless DC motor.
  • the compressor motor (25) includes a stator (26) and a rotor (27) to compose a driving motor.
  • the stator (26) is fixed to the body member (16) of the casing (15).
  • the stator (26) is connected electrically to a feeder terminal (19) mounted at the body member (16) of the casing (15).
  • the rotor (26) is arranged inside the stator (26) so as to be fixed to the main shaft portion (21) of the crank shaft (20).
  • the compression mechanism (30) includes an orbiting scroll (31), a fixed scroll (34), and a housing (36) as a housing member (36).
  • the housing (36) is in a comparatively thick disc shape of which central part is recessed, wherein the outer peripheral part thereof is joined to the upper end of the body member (16).
  • the main shaft portion (21) of the crank shaft (20) is inserted in the central part of the housing (36).
  • the housing (36) composes a bearing (36a) rotatably supporting the main shaft portion (21) of the crank shaft (20).
  • the orbiting scroll (31) includes an orbiting scroll end plate (31a), an orbiting scroll wrap (32) in a spiral shape standing on the front face thereof (the upper face in FIG. 1 ), and a cylindrical protrusion (33) protruding from the back face thereof (the lower face in FIG. 1 ).
  • the orbiting scroll (31) is placed on the upper face of the housing (36) with an Oldham ring (39) shown in FIG. 13 interposed.
  • the eccentric portion (22) of the crank shaft (20) is inserted in the protrusion (33) of the orbiting scroll (31). In other words, the orbiting scroll (31) is engaged with the crank shaft (20).
  • the fixed scroll (34) is in a comparatively thick disc shape and includes a fixed scroll end plate (34a).
  • a fixed scroll wrap (35) in a spiral shape is provided at the central part of the fixed scroll (34).
  • the fixed scroll wrap (35) is formed by engraving the fixed scroll (34) from the lower face thereof.
  • the fixed scroll wrap (35) of the fixed scroll (34) and the orbiting scroll wrap (32) of the orbiting scroll (31) are meshed with each other in the compression mechanism (30). Meshing of the fixed scroll wrap (35) and the orbiting scroll wrap (32) with each other forms a plurality of compression chambers (37) between the outer peripheral face of the fixed scroll wrap (35) and the inner peripheral face of the orbiting scroll wrap (32) and between the inner peripheral face of the fixed scroll wrap (35) and the outer peripheral face of the orbiting scroll wrap (32).
  • the positioning apparatus (40) of the present embodiment is provided for positioning the fixed scroll (34) on the basis of the positional relationship between the fixed scroll wrap (35) and the orbiting scroll wrap (32) in a process of assembling the scroll compressor (10). Specifically, the positioning apparatus (40) appropriates the positional relationship between the fixed scroll (34) and the orbiting scroll (31) by adjusting the position of the fixed scroll (34) in mounting the fixed scroll (34) to a later-described assembly (11) prepared in the process of assembling the scroll compressor (10).
  • the assembly (11) is an assembled integration of the body member (16), the housing (36), the compressor motor (25), the lower bearing member (23), the crank shaft (20), and the orbiting scroll (31).
  • the housing (36), the compressor motor (25), and the lower bearing member (23) are fixed to the body member (16), and the orbiting scroll (31) engaged with the crank shaft (20) is placed on the housing (36).
  • the stator (26) of the compressor motor (25) is connected electrically to the feeder terminal (19) in the assembly (11).
  • the construction of the positioning apparatus (40) will be described with reference to FIG. 3 .
  • the positioning apparatus (40) includes a first frame (45) and a second frame (60).
  • the first frame (45) includes one pedestal (46), one upper plate (47), and four poles (48).
  • the pedestal (46) is formed in a rectangular shape and is arranged substantially horizontally.
  • the poles (48) stand at the corners of the pedestal (46).
  • the poles (48) pass through the pedestal (46) and protrude at the lower ends thereof downward from the pedestal (46).
  • the upper plate (47) is fixed at the upper ends of the four standing poles (48).
  • a cylindrical guide member (50) protrudes from the central part of the upper face of the pedestal (46).
  • the guide member (50) is provided for guiding the body member (16) to a predetermined point when the assembly (11) is placed on the pedestal (46), and has an inner diameter slightly larger than the outer diameter of the body member (16).
  • a through hole (52) is formed at the center of the pedestal (46).
  • the through hole (52) is a circular hole formed coaxially with the guide member (50) and passes through the pedestal (46).
  • a rotary encoder (53) is mounted at the lower face of the pedestal (46) through a bracket (54).
  • the rotary encoder (53) is arranged under the through hole (52) and has a rotating shaft (53a) extending upward toward the through hole (52).
  • a coupling (55) is mounted at the rotating shaft (53a) of the rotary encoder (53).
  • the coupling (55) joins the rotating shaft (53a) of the rotary encoder (53) and a part of an oil pickup (20a) at the lower end of the crank shaft (20) which protrudes downward from the through hole (52).
  • the oil pickup (20a) is formed integrally with the crank shaft (20), as shown in FIG. 3 .
  • the oil pickup is fitted to an oil pump (not shown) to supply a lubricant oil to bearings and sliding elements of the compression mechanism (30) through an oil supply passage (not shown) vertically extending in the central part of the crank shaft (20).
  • a pressing mechanism (56) for pressing the fixed scroll (34) downward is mounted at the upper plate (47).
  • the pressing mechanism (56) includes a downwardly extending rod (57a) and is arranged substantially at the center of the upper plate (47).
  • a pressing member (58) larger in sectional area than the rod (57a) is mounted at the lower end of the rod (57a).
  • a guide (41), which will be described later, is mounted at the lower face of the pressing member (58).
  • the pressing mechanism (58) feeds the rod (57a) by an air cylinder (57) or the like to move the pressing member (58) and the guide (41) downward to apply the pressing force to the fixed scroll (34).
  • the guide (41) will be described with reference to FIG. 4 .
  • the guide (41) includes a base plate (59), an X-axis rail ( 49a ) and a Y-axis rail (49b) intersected at a right angle with each other, linear motion bearings (51) engaged with the X-axis rail (49a) and the Y-axis rail (49b), and three presser rods (28) provided at the lower face of the base plate (59) as shown in FIG. 3 .
  • the X-axis rail (49a) includes two rail members having the same length.
  • the two rail members of the X-axis rail (49a) are arranged and fixed in parallel to each other with a predetermined space left on the upper face of the base plate (59).
  • the Y-axis rail (49b) includes two rail members having the same length.
  • the two rail members of the Y-axis rail (49b) are arranged and fixed in parallel to each other with a predetermined space left on the lower face of the pressing member (58).
  • a spike (28a) for inhibiting rotation of the fixed scroll (34) is formed at each lower end of the presser rods (28).
  • the presser rods (28) inhibit sliding of the fixed scroll (34) on the guide (41) when the fixed scroll (34) is moved in the state that the guide (41) applies the pressing force to the fixed scroll (34).
  • Provision of the spike (28a) at each lower end of the presser rods (28) generates, at the contact face between the presser rods (28) and the fixed scroll (34), larger frictional force than the frictional force generated at the contact face between the fixed scroll (34) and the housing (36).
  • the respective linear motion bearings (51) are provided at the parts where the X-axis rail (49a) and the Y-axis rail (49b) are intersected with each other.
  • the guide (41) is provided with the linear motion bearings (51) of which number is four in total.
  • the linear motion bearings (51) are substantially in a cubic shape having a lower face in which a groove in the X-axis direction is formed and an upper face in which a groove in the Y-axis direction is formed.
  • the X-axis rail (49a) is fitted in the groove in each lower face of the linear motion bearings (51) while the Y-axis rail (49b) is fitted in the groove in each upper face thereof.
  • the linear motion bearings (51) are prevented from falling off in the Z-axis direction (the direction at a right angle with respect to the plane of the base plate (59)).
  • Multiple ball members not shown are embedded in the grooves in the X-axis direction and the Y-axis direction of the linear motion bearings (51).
  • Each linear motion bearing (51) is in contact with the X-axis rail (49a) and the Y-axis rail (49b) with the multiple ball members interposed so as to have a rolling guide structure that moves straight along the rails.
  • the guide (41) allows the parallel movement of the fixed scroll (34) in the X-axis direction and the Y-axis direction that are right-angled to each other while restricting rotation of the fixed scroll (34) under the state where the pressing force is applied to the fixed scroll (34).
  • the second frame (60) includes one frame member (61) and four poles (62) and is fixed on the pedestal (46).
  • the length of the poles (62) is slightly shorter than the height of the body member (16) composing the assembly (11).
  • the four poles (62) stand around the guide member (50) at regular intervals on the pedestal (46).
  • the frame member (61) is in a rectangular or circular frame shape and is placed on the four poles (62).
  • the frame member (61) is fixed to the poles (62) so as to surround the upper part of the assembly (11).
  • the frame member (61) is provided with a cramp mechanism (63) for fixing the assembly (11).
  • the cramp mechanism (63) serves as a fixing member.
  • the cramp mechanism (63) includes a plurality of movable cramp heads (64) protruding inward from the frame member (61).
  • the cramp mechanism (63) allows the cramp heads (64) to push the outer peripheral face of the body member (16) composing the assembly (11) to clip the sides of the assembly (11) in the radial direction of the body member (16), thereby holding the assembly (11).
  • four cramp heads (64) in total are provided on the radial lines in the X-axis direction and the Y-axis direction, for example.
  • position detection mechanisms for detecting the position of the fixed scroll (34) in the X-axis direction and the Y-axis direction and four striking units (70) arranged two by two on the X-axis and the Y-axis.
  • Electric micrometers (66) may be used as the position detection mechanisms (65).
  • the electric micrometers (66) measure the position and the dimension of a measurement target by utilizing an electric signal.
  • any other position measuring tools such as laser displacement gauges or the like may be used rather than the electric micrometers (66).
  • the laser displacement gauges measure displacement of the fixed scroll (34) from reflected light of a laser beam irradiated on the fixed scroll (34).
  • the striking units (70) are in a circular column shape and each include a head (74) at the extreme end at which a projection is formed (see FIG. 6 ).
  • the four striking units (70) serve as a moving mechanism (75) for moving the fixed scroll (34) by applying impact force to the fixed scroll (34).
  • the four striking units (70) are arranged radially at the intervals of 90 degrees with the fixed scroll (34) on the housing (36) of the assembly (11) as a center.
  • two striking units (70) are arranged along a first radial direction (the X-axis direction) of the fixed scroll (34) while the other two striking units (70) are arranged along a second radial direction (the Y-axis direction) intersected at a right angle with the first radial direction.
  • the projection of the head (74) of each striking unit (70) faces the fixed scroll (34). Namely, each two striking units (70) arranged along one of the radial directions faces each other with the fixed scroll (34) interposed.
  • the first radial direction is parallel to the X-axis direction of the guide (41).
  • the second radial direction is parallel to the Y-axis direction of the guide (41).
  • the X-axis direction and the Y-axis direction in which the guide (41) allows the movement of the fixed scroll (34) agree with the directions of the impact force that the striking units (70) apply to the fixed scroll (34).
  • the X-axis rail (49a) is guided to the grooves in the X-axis direction of the linear motion beatings (51), thereby moving the fixed scroll (34) in the X-axis direction.
  • Each striking unit (70) includes one main body (1) and one air cylinder (100).
  • the main body (71) and the air cylinder (100) have cylindrical outer shapes and are arranged coaxially with each other.
  • the main body (71) includes a base part (72), a piezoelectric element (72), and a head (74) and is formed into a column shape as a whole. Specifically, in the main body (71), the base part (72) and the head (74), both of which are formed in column shapes are arranged coaxially with each other, and the piezoelectric element (73) is interposed between the base part (72) and the head (74). The projection is formed at the tip end (on the side opposite to the piezoelectric element (73)) of the head (74). In the main body (71), when voltage is applied to the piezoelectric element (73), the piezoelectric element (73) extends in the axial direction of the main body (71) to push out the head (74) (see FIG. 6B ). When the electric conduction to the piezoelectric element (73) is stopped, the piezoelectric element (73) returns to have the original length, thereby returning the head (74) (see FIG. 6(A) ).
  • the air cylinder (100) includes a cylinder (102), a piston (102), and a rod (103).
  • the cylinder (101) has a hollowed cylindrical shape.
  • the piston (102) is inserted in the cylinder (101) so as to be movable in the axial direction of the cylinder (101).
  • the rod (103) is arranged coaxially with the cylinder (101).
  • the rod (103) is connected at the base end thereof to the piston (102) while extending at the tip end thereof outside the cylinder (101).
  • the tip end of the rod (103) is joined to the end face of the base part (72) of the main body (71).
  • the inside of the cylinder (101) is divided by the piston (102) into a first air chamber (104) and the a second air camber (105).
  • a first air pipe (106) is connected to the first air chamber (104) located on the opposite side to the rod (103) while a second air pipe (107) is connected to the second air chamber (105) located on the rode (103) side.
  • each of the striking units (70) when the air is supplied from the first air pipe (106) to the first air chamber (104) while at the same time the air is discharged from the second air chamber (105) to the second air pipe (107), the piston (102) moves toward the second air chamber (105) to send out the main body (71) toward the tip end of the striking unit (70) (leftward in FIG. 6 ).
  • the piston (102) moves toward the first air chamber (104) to return the main body (71) backward toward the base end of the striking unit (70) (rightward in FIG. 6 ).
  • the positioning apparatus (40) includes an inverter (81), a driver (82) for the inverter (81), and a controller (control means) (80).
  • the inverter (81) and the driver (82) compose feeding means (83).
  • the inverter (81) is connected at the input side thereof to a commercial power source (85) while being connected at the output side thereof to the feeder terminal (19) of the assembly (11).
  • the driver (82) receives an output signal from the rotary encoder (53).
  • the positioning apparatus (40) includes, though not shown in FIG. 7 , a laser displacement gauge (91) for measuring the phase of the crank shaft (20) (see FIG. 18 ).
  • the laser displacement gauge (91) for phase measurement measures the phases of the crank shaft (20) and the orbiting scroll (31) and composes a phase detection mechanism (90) in the present invention in combination with the rotary encoder (53).
  • the driver (82) computes the rotation angle and the angular velocity of the crank shaft (20) on the basis of the output signal of the rotary encoder (53) and sets, according thereto, an instruction value in relation to the output current value and the output frequency of the inverter (81).
  • the driver (82) then outputs an instruction, such as switching timing or the like to the inverter (81) so that the output of the inverter (81) corresponds to the instruction value.
  • the inverter (81) is operated in accordance with the instruction from the driver (82) to supply the alternating current to the compressor motor (25) of the assembly (11).
  • the controller (80) receives an instruction value in relation to the output current of the inverter (81) and information on the rotation angle of the crank shaft (20) from the driver (82).
  • the controller (80) determines the direction in which the fixed scroll (34) is to be moved on the basis of the phase or the rotation angle of the orbiting scroll (31). Further, the controller (80) allows the striking units (70) to move the fixed scroll (35) by a predetermined distance (about several microns to ten microns) in the direction in which the outer peripheral face of the fixed scroll wrap (35) separates from the inner peripheral face of the orbiting scroll wrap (32) in a predetermined part of the fixed scroll (34) and performs then control for inverting the orbiting scroll (31) by approximately 180°.
  • the outer peripheral face of the orbiting scroll wrap (32) is in contact with the inner peripheral face of the fixed scroll wrap (35) to cause the fixed scroll (34) to shift by the repulsive force of the orbiting scroll wrap (32).
  • the position of the predetermined part thereof is recognized as a limit point of a movable range of the fixed scroll (34).
  • each end of the movable range on the X-axis of the fixed scroll (34) can be detected. Then, the fixed scroll (34) is moved to the center on the X-axis of the movable range thereof. Next, after the same operation is performed in the plus direction and the minus direction on the Y-axis, the fixed scroll (34) is moved to the center on the Y-axis of the movable range thereof. At this time point, the fixed scroll (34) is positioned almost at the center though the first centering operation in the X-axis direction was performed with no center on the Y-axis determined. Therefore, in order to perform more precise centering, in the present embodiment, control is performed so that the same operation is performed in the plus direction and the minus direction on the X-axis again for setting the fixed scroll (34) at the center of the movable range thereof.
  • the controller (80) controls a striking unit (70) corresponding to the determined direction. Specifically, the controller (80) first allows the first air pipe (106) to supply the air to the first air chamber (104) while allowing the second air chamber (105) to discharge the air to the second air pipe (107) to move the main body (71) so that the projection of the head (74) of the striking unit (70) is in contact with the fixed scroll (34). After the striking unit (70) is moved, the controller (80) applies pulse voltage to the piezoelectric element (73) of the striking unit (70).
  • the piezoelectric element (73) of the striking unit (70) Upon application of the pulse voltage to the piezoelectric element (73) of the striking unit (70), the piezoelectric element (73) extends and contracts according to the pulse waveform. Accordingly, the inertia force of the head (74) pushed out by the extension of the piezoelectric element (73) works on the fixed scroll (34) to move the fixed scroll (34) slightly (by about several microns to ten microns). Movement of the fixed scroll (34) results in separation of the head (74) from the fixed scroll (34).
  • the striking unit (70) is moved so that the projection of the head (74) is in contact with the fixed scroll (34) again, and the pulse voltage is applied again to the piezoelectric element (73) of the striking unit (70) to move the fixed scroll (34) slightly by extension and contraction of the piezoelectric element (73). Repetition of this operation moves the fixed scroll (34) pressed to the housing (36) little by little.
  • the controller (80) allows the second air pipe (107) to supply the air to the second air chamber (105) while allowing the first air chamber (104) to discharge the air to the first air pipe (106) to return the striking unit (70) to the original position.
  • the controller (80) controls the right (or left) striking unit (70).
  • the controller (80) adjusts the air amounts in the first air chamber (104) and the second air chamber (105) of the air cylinder (100) for moving the main body (71) and supplies the pulse voltage to the piezoelectric element (73) of the main body (71) for applying the leftward (or rightward) impact force to the fixed scroll (34).
  • the controller (80) controls the upper (or lower) striking unit (70).
  • FIG. 8 is a plan view showing the assembly (11) obtained by assembling the body member (16), the housing (36), the compressor motor (25), the lower bearing member (23), the crank shaft (20), and the orbiting scroll (31), and FIG. 9 is a plan view of the assembly ( 11 ) to which the fixed scroll (34) is set.
  • FIG. 10 is a plan view of the orbiting scroll (31)
  • FIG. 11 is a plan view of the fixed scroll (34).
  • the orbiting scroll (31) includes at three parts on the outer peripheral face of the orbiting scroll end plate (31a) outer peripheral protrusions (31b) protruding outward in the radial direction for dynamic balance. Notches (34b) for weight reduction are formed at three parts on the outer peripheral edge of the fixed scroll end plate (34a) of the fixed scroll (34).
  • the housing (36) is provided with four mounting parts (36b) for mounting the fixed scroll (34).
  • each of the mounting parts (36b) there are formed two housing positioning pin holes (36c) receiving positioning pins ( 38a ) (see FIG. 14 ) for positioning the fixed scroll (34) and five bolt holes (36d) for fastening the fixed scroll (34) by means of bolts (38b) (see FIG. 15 ).
  • the fixed scroll (34) there are formed two fixed scroll positioning pin holes (34c) at points corresponding to the housing positioning pin holes (36c) and five bolt holes (34d) at points corresponding to the bolt holes (36d) of the housing (36).
  • the fixed scroll (34) is positioned provisionally by the positioning pins (38a) to the housing (36) and is then fixed to the housing (36) by means of the bolts (38b).
  • FIG. 9 shows this state.
  • the laser displacement gauge (91) composing the phase detection mechanism (90) is arranged above the notches (34b) for detecting the outer peripheral protrusions (31b) of the orbiting scroll (31), and the phase of the crank shaft (20), that is, the phase of the orbiting scroll (31) during rotation of the compressor motor (25) is detected on the basis of the detected positions of the outer peripheral protrusions (31b) and the rotation position signal of the rotary encoder (53).
  • the positioning pin holes (34c, 36c) are formed in the outer peripheral parts of the housing (36) and the fixed scroll (34), respectively.
  • the clearance of the positioning pin holes (34c, 36c) is set precisely in the range of, for example, 30 ⁇ m ⁇ 10 ⁇ m with respect to the diameter of the positioning pins (38a).
  • the pitch diameter of the positioning pin holes (34c, 36c) is ⁇ 130 mm
  • displacement in the rotation ( ⁇ ) direction is approximately 1.5 ⁇ m or smaller though it differs slightly according to the base circle diameter, and accordingly, sufficient position accuracy can be achieved in the ⁇ direction.
  • a method for positioning the fixed scroll (34) which the positioning apparatus (40) performs will be described with the method divided into a fixing step including setup steps before positioning the fixed scroll (34) and a fixed scroll (34) positioning step. The description will be given in this order.
  • FIG. 12 to FIG. 16 show the setup steps before positioning the fixed scroll (34).
  • a refrigerator oil (96) used as a lubricant oil is injected to the bearing (36a) of the housing (36) under the state that the assembly (11) before the orbiting scroll (31) is fitted to the crank shaft (20) is placed on a conveyance pallet (95) with the housing (36) located up.
  • a refrigerator oil (96) is used which has viscosity lower than the refrigerator oil (96) used for the scroll compressor (10) after assembled.
  • an oil having a low viscosity of VG32, VG22, or the like is used as the lubricant oil (96) for the assembling process.
  • An oil having high viscosity is supplied to the bearings non-uniformly especially at low outdoor temperature, so that the oil film formed becomes non-uniform in thickness at low-speed rotation, for example, at the positioning step to invite assembling with the center of the crank shaft (20) displaced.
  • the use of the oil having such low viscosity prevents displacement of the center of the crank shaft (20) in the assembling process. If an oil having low viscosity is supplied to the bearing (23a) of the lower bearing member (32) in advance, displacement of the center of the crank shaft (20) can be prevented further effectively.
  • the Oldham ring (39) and the orbiting scroll (31) are mounted to the assembly (11), and the lubricant oil (96) is injected to the sliding elements.
  • the refrigerator oil (96) is used which has viscosity lower than the refrigerator oil (96) for the scroll compressor (10) after assembled.
  • the fixed scroll (34) is placed on the housing (36) and the orbiting scroll (31) so that the fixed scroll wrap (35) and the orbiting scroll wrap (32) are meshed with each other, and the fixed scroll (34) is positioned in the X- and Y-axis directions temporarily with the use of the positioning pins (38a).
  • the fixed scroll (34) is positioned in the ⁇ direction sufficiently accurately, and accordingly, the positioning pins (38a) serve as final positioning means for positioning in the ⁇ direction.
  • the fixed scroll (34) is fastened to the housing (31) by means of the bolts (38b) with the positioning pins (38a) inserted in the positioning holes (34c, 36c ) to fixed the fixed scroll (34) provisionally.
  • a fifth setup step shown in FIG. 16 the positioning pins (38a) are taken off:
  • the assembly (11) is conveyed to a centering/assembling facility (the positioning apparatus (40)), as shown in FIG. 17 .
  • the centering/assembling facility (40) is simplified.
  • FIG. 18 shows the state where the assembly (11) is conveyed to the centering/assembling facility (40).
  • this state serves as a first centering step.
  • the assembly (11) is placed on the pedestal (46) together with the conveyance pallet (95) with the housing (36) located up (the conveyance pallet (95) is omitted in FIG. 3 and FIG. 7 ), and various members are on standby around the assembly (11), such as the pressing mechanism (56), the cramp mechanism (63), the striking units (70), the rotary encoder (53) and the coupling (55), the position detection mechanisms (65), and the phase detection mechanism (90).
  • a nut runner (97), the feeder connector (42), and the like are on standby therearound in addition.
  • FIG. 18 show operation images of the respective steps and have no difference in function from FIG. 3 and FIG. 7 though detailed specific structures of the cramp mechanism (63), the striking units (70), and the like are slightly different from those in FIG. 3 and FIG. 7 . Therefore, the operation will be described below with reference to the images.
  • the lower end of the body member (16) (or the conveyance pallet (95)) is fitted inside the guide member (50) so as to position the lower end face of the crank shaft (20) above the through hole (52) and so as to allow the oil pickup (20a) to protrude downward from the through hole (52), as shown in FIG. 3 and FIG. 7 .
  • the cramp head (64) of the cramp mechanism (63) is allowed to push the outer peripheral face of the main body (16) of the assembly (11) to fix the assembly (11) from the surrounding thereof, and the feeder terminal (19) is connected to the feeder connecter (42).
  • the rotating shaft (53a) of the rotary encoder (53) is connected to the oil pickup (20a) of the crank shaft (20) by means of the coupling (55), and the air cylinder (57) of the pressing mechanism (56) is operated to press the fixed scroll (34) to the housing (36) of the assembly (11).
  • a third centering step shown in FIG. 20 the nut runner (97) is lowered to loosen the bolts (38b). Because, with the bolts (38b) fastened, the striking units (70) cannot move the fixed scroll (34) (for position adjustment) thereafter.
  • a fourth centering step shown in FIG. 21 is performed.
  • the nut runner (97) is raised, and the laser displacement gauge (91) of the phase detection mechanism (90) advances.
  • the sensor (92) of the laser displacement gauge (91) is located above the notches (34b) of the fixed scroll (34) (see FIG. 9 ).
  • the driver (82) shown in FIG. 7 allows the compressor motor (25) to be conducted through the inverter (81) to cause the crank shaft (20) to rotate at a constant low rotation speed, for example, approximately four rotations per one second, and the laser displacement gauge (91) detects the outer peripheral protrusions (31b) of the orbiting scroll (31) through the notches (34b) of the fixed scroll (34). Then, the driver (82) detects the phase of the crank shaft (20), that is, the phase of the orbiting scroll (31) on the basis of the position of the outer peripheral protrusions (31b) and the rotation position signal of the rotary encoder (53).
  • a sixth centering step shown in FIG. 23 is performed.
  • the laser displacement gauge (91) of the phase detection mechanism (90) is retreated while the striking units (70) are allowed to advance.
  • the electric micrometers (66) on the X-axis and the Y-axis, which serve as the position detection mechanisms (65) are allowed to advance for detection of the location of the fixed scroll (34).
  • a first centering operation, a second centering operation, and a third centering operation are performed in this order, wherein: the first centering operation is performed in such a way that each end of the movable range in the X-axis direction of the fixed scroll (34) is once detected and the fixed scroll (34) is positioned at the center therebetween; the second centering operation is performed in such a way that each end of the movable range of the fixed scroll (34) in the Y-axis direction is detected next and the fixed scroll (34) is positioned at the center therebetween; and the third centering operation is performed in such a way that each end of the movable range of the fixed scroll (34) in the X-axis direction is detected again and the fixed scroll (34) is positioned at the center therebetween.
  • the phase or the rotation angle of the fixed scroll (34) has been detected, and accordingly, the fixed scroll (34) at a predetermined part thereof (where the fixed scroll wrap (35) is close to or in contact with the orbiting scroll wrap (32)) is moved in the minus direction (or the plus direction) on the X-axis first on the basis of the detected phase so that the outer peripheral face of the fixed scroll wrap (35) separates from the inner peripheral face of the orbiting scroll wrap (32).
  • the fixed scroll (34) at a predetermined part thereof where the fixed scroll wrap (35) is close to or in contact with the orbiting scroll wrap (32)
  • the right striking unit (70) in the drawing is operated when the orbiting scroll (31) is located at the end in the minus direction on the X-axis (left end in the drawing), as shown in FIG. 26 . Then, whether or not the fixed scroll (34) shifts upon inversion of the orbiting scroll (31) is judged. Unless shift of the fixed scroll (34) is detected, which means that the wraps (32, 35) are out of contact with each other yet, striking of the fixed scroll (34) and the inversion of the orbiting scroll (31) are repeated.
  • the point of the predetermined part is judged as one end of a movable range of the fixed scroll (34).
  • the same operation is performed in the plus direction (or the minus direction) on the X-axis to detect the other end of the movable range of the fixed scroll (34).
  • the contact position of the fixed scroll (34) is detected at each two (plural) points in the respective minus directions and the respective plus directions on the X-axis and the Y-axis, and the fixed scroll (34) is positioned at the respective centers.
  • movement of the fixed scroll (34) in the minus direction on the X-axis and inversion of the orbiting scroll (31) are repeated to set, as a first contact point in the X-axis direction, the point where contact between the fixed scroll wrap (35) and the orbiting scroll wrap (32) is detected, and then, movement of the fixed scroll (34) in the plus direction on the X-axis and inversion of the orbiting scroll (31) are repeated to set, as a second contact point in the X-axis direction, the point where contact between the fixed scroll wrap (35) and the orbiting scroll wrap (32) is detected. Accordingly, the center between the first contact point and the second contact point is set as the center in the X-axis direction.
  • movement of the fixed scroll (34) in the minus direction on the Y-axis and inversion of the orbiting scroll (31) are repeated to set, as a first contact point in the Y-axis direction, the point where contact between the fixed scroll wrap (35) and the orbiting scroll wrap (32) is detected, and then, movement of the fixed scroll (34) in the plus direction on the Y-axis and inversion of the orbiting scroll (31) are repeated to set, as a second contact point in the Y-axis direction, the point where contact between the fixed scroll wrap (35) and the orbiting scroll wrap (32) is detected. Accordingly, the center between the first contact point and the second contact point is set as the center in the Y-axis direction.
  • movement of the fixed scroll (34) in the minus direction on the X-axis and inversion of the orbiting scroll (31) are repeated to set, as a first contact point in the X-axis direction, the point where contact between the fixed scroll wrap (35) and the orbiting scroll wrap (32) is detected, and then, movement of the fixed scroll (34) in the plus direction on the X-axis and inversion of the orbiting scroll (31) are repeated to set, as a second contact point in the X-axis direction, the point where contact between the fixed scroll wrap (35) and the orbiting scroll wrap (32) is detected. Accordingly, the center between the first contact point and the second contact point is set as the center in the X-axis direction.
  • the fixed scroll (34) is positioned at the respective centers of the movable ranges.
  • the center of the fixed scroll (31) can be obtained to lead to positioning of the fixed scroll (34).
  • the direction in which the fixed scroll (34) is to be moved is restricted to the X-axis direction and the Y-axis direction by the guide (41) of the pressing mechanism (56), and the impact force is applied in the direction in which the wraps (32, 35) separate from each other in the predetermined part of the fixed scroll (34) (where the fixed scroll wrap (35) is closed to or in contact with the orbiting scroll wrap (32)). Accordingly, the fixed scroll (34) is moved in parallel without being rotated.
  • an eighth centering step shown in FIG. 27 is performed.
  • the conduction to the compressor motor (25) is stopped first to stop each rotation of the crank shaft (20) and the orbiting scroll (34).
  • the striking units (70) and the electric micrometers (66) are retreated, and the nut runner (97) is lowered to fasten the bolts (38b), thereby fastening the fixed scroll (34) to the housing (36).
  • the fixed scroll (34) is positioned accurately.
  • the routine proceeds to a ninth centering step shown in FIG. 28 .
  • the ninth centering step the nut runner (97) is raised, and the rod (57a) of the air cylinder (57) is retreated to raise the pressing member (58) of the pressing mechanism (56).
  • the rotary encoder (53) and the coupling (55) are integrally lowered to be taken off from the oil pickup (20a) of the crank shaft (20).
  • the cramp mechanism (63) is retreated, and the feeder connector (42) is retreated to be taken off from the feeder terminal (19).
  • a work conveying step is performed for conveying the assembly (11) out from the positioning apparatus (40) as the centering/assembling facility.
  • the fixed scroll (34) when the orbiting scroll (31) is inverted after the moving mechanism (75) is operated on the basis of the rotation angle of the fixed scroll (34) detected by the phase detection mechanism (90) to move the fixed scroll (34) in the direction in which the wraps (32, 35) separate from each other, the fixed scroll (34) may shift by being pushed back against the orbiting scroll wrap (32).
  • the position detection mechanism (65) detects the shift, it is judged that the wraps (32, 35) are in contact with each other.
  • the position detection is performed at plural points to determine the center of the fixed scroll (34) for positioning the fixed scroll (34).
  • the fixed scroll (34) In movement of the fixed scroll (34), the fixed scroll (34) is moved in the direction in which the wraps (32, 35) separate from each other, and therefore, rotation of the fixed scroll (34) by receiving the impact force in the direction in which the contact force of the wraps (32, 35) increases is prevented.
  • the center of the fixed scroll (34) can be obtained more accurately than in the conventional one to thus position the fixed scroll (34) at the thus obtained center accurately.
  • the striking unit (70) applies the impact force to the fixed scroll (34) with the fixed scroll (34) pressed to the housing member (36). This moves the fixed scroll (34) by a minute distance to achieve precise positioning of the fixed scroll (34).
  • the phase detection mechanism (90) detects the phase of the orbiting scroll (31) with the orbiting scroll (31) rotated. Then, when the direction where the wraps (32, 35) separate from each other agrees with the direction where the fixed scroll (34) is to be moved in rotating the orbiting scroll (31), the fixed scroll (34) is moved. Further, operation for detecting the position of the fixed scroll (34) is performed plural times in a region opposite to the part where the wraps (32, 35) separate from each other. Whereby, the fixed scroll (34) is positioned. Specifically, the fixed scroll (34) is moved in the region where striking (movement) is capable and the position of the fixed scroll (34) is detected in the other region for judging the contact between the wraps (32, 35).
  • the X-axis direction and the Y-axis direction in which the guide (41) allows the fixed scroll (34) to be moved agree with the directions of the impact force that the moving mechanism (75) applies to the fixed scroll (34). Therefore, in combination thereof with the movement of the fixed scroll (34) in the direction in which the wraps (32, 35) separate from each other, the fixed scroll (34) is prevented definitely from being rotated. Hence, the positioning accuracy increases further.
  • the fixed scroll (34) is centered once in the X-axis direction first, in the Y-axis direction next, and in the X-axis direction again to thus position the fixed scroll (34).
  • the first centering operation in the X-axis direction which is performed with no center in the Y-axis direction obtained yet, may not be necessarily accurate.
  • the fixed scroll (34) can be positioned accurately.
  • the fixed scroll (34) is positioned at the respective centers of the movable ranges. Accordingly, the fixed scroll (34) can be positioned accurately by computing the center on the X-axis and the center on the Y-axis.
  • the center of the fixed scroll (34) is set at the respective centers of the movable ranges after each end in the respective movable ranges in the X-axis direction and the Y-axis direction of the fixed scroll (34) is detected, so that the fixed scroll (34) can be positioned accurately.
  • the oil having viscosity lower than refrigerator oil for the scroll compressor (10) after assembled is used as the lubricant oil for the movable elements of the assembly (11). This prevents displacement of the center of the crank shaft in the assembling process.
  • the above embodiment may have any of the following aspects.
  • the air cylinder (100) is used for advancing/retreating the head (74) of the striking units (70), but a crank mechanism or a cam mechanism may be used instead.
  • the striking units (70) as means for moving the fixed scroll (34) may not necessarily include the piezoelectric elements (73), and another elements may be used, such as a moving mechanism (75) using a feeding mechanism by means of ball screws.
  • the moving mechanism (75) may be any mechanism only if it can adjust the position of the fixed scroll (34).
  • the fixed scroll (34) is positioned with the orbiting scroll (31) rotated in the above embodiment.
  • the fixed scroll (34) may be positioned by striking of the fixed scroll (34) and inverting the orbiting scroll (31) in the X-axis direction and the Y-axis direction with the orbiting scroll (31) stopped at a predetermined position.
  • the laser displacement gauge (91) detects the phase of the orbiting scroll (31) through the notches (34b) of the orbiting scroll (31) after the fixed scroll (34) is mounted to the assembly (11).
  • the phase detection mechanism (90) such as a laser displacement gauge may detect the eccentric portion (22) of the crank shaft (20) before the orbiting scroll (31) and the fixed scroll (34) are mounted to the assembly (11).
  • the present invention is useful for apparatus and method for positioning a fixed scroll in assembling a scroll fluid machinery.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Rotary Pumps (AREA)
EP07851096.3A 2006-12-28 2007-12-21 Vorrichtung und verfahren zum positionieren einer fixen spirale Withdrawn EP2096311A4 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2006354303A JP4135028B2 (ja) 2006-12-28 2006-12-28 固定スクロールの位置決め装置及び位置決め方法
PCT/JP2007/074744 WO2008081759A1 (ja) 2006-12-28 2007-12-21 固定スクロールの位置決め装置及び位置決め方法

Publications (2)

Publication Number Publication Date
EP2096311A1 true EP2096311A1 (de) 2009-09-02
EP2096311A4 EP2096311A4 (de) 2014-12-10

Family

ID=39588443

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07851096.3A Withdrawn EP2096311A4 (de) 2006-12-28 2007-12-21 Vorrichtung und verfahren zum positionieren einer fixen spirale

Country Status (4)

Country Link
EP (1) EP2096311A4 (de)
JP (1) JP4135028B2 (de)
CN (1) CN101573536B (de)
WO (1) WO2008081759A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020217065A1 (en) * 2019-04-26 2020-10-29 Edwards Limited Adjustable scroll pump

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2934185A1 (fr) * 2008-07-28 2010-01-29 Adel Procede de realisation d'une virole de compresseur
CN109014264A (zh) * 2018-06-29 2018-12-18 江西佳时特数控技术有限公司 涡旋盘柔性生产线用静盘底面加工工装

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1182352A2 (de) * 2000-08-25 2002-02-27 Fujitsu General Limited Vorrichtung und Verfahren zum Ausrichten eines Spiralverdichters
JP2002081385A (ja) * 2000-09-06 2002-03-22 Nidec Tosok Corp スクロールコンプレッサーの芯出し方法及び芯出し装置
JP2006207528A (ja) * 2005-01-31 2006-08-10 Daikin Ind Ltd 固定スクロールの位置決め装置および位置決め方法

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63295886A (ja) * 1987-05-26 1988-12-02 Toshiba Corp スクロ−ル圧縮機の調心位置決め方法
JP4120764B2 (ja) * 2001-12-21 2008-07-16 株式会社富士通ゼネラル スクロール圧縮機の調芯装置およびその調芯方法
JP2006207529A (ja) * 2005-01-31 2006-08-10 Daikin Ind Ltd 固定スクロールの位置決め装置

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1182352A2 (de) * 2000-08-25 2002-02-27 Fujitsu General Limited Vorrichtung und Verfahren zum Ausrichten eines Spiralverdichters
JP2002081385A (ja) * 2000-09-06 2002-03-22 Nidec Tosok Corp スクロールコンプレッサーの芯出し方法及び芯出し装置
JP2006207528A (ja) * 2005-01-31 2006-08-10 Daikin Ind Ltd 固定スクロールの位置決め装置および位置決め方法

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of WO2008081759A1 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020217065A1 (en) * 2019-04-26 2020-10-29 Edwards Limited Adjustable scroll pump
CN113710873A (zh) * 2019-04-26 2021-11-26 爱德华兹有限公司 可调节的涡旋泵

Also Published As

Publication number Publication date
JP2008163836A (ja) 2008-07-17
WO2008081759A1 (ja) 2008-07-10
EP2096311A4 (de) 2014-12-10
JP4135028B2 (ja) 2008-08-20
CN101573536B (zh) 2012-05-30
CN101573536A (zh) 2009-11-04

Similar Documents

Publication Publication Date Title
US8006379B2 (en) Fixed scroll positioning apparatus and fixed scroll positioning method
US8061028B2 (en) Fixed scroll positioning apparatus and fixed scroll positioning method
EP2096313B1 (de) Vorrichtung zum positionieren einer fixen spirale
EP2096311A1 (de) Vorrichtung und verfahren zum positionieren einer fixen spirale
EP2096312B1 (de) Verfahren zum positionieren einer fixen spirale
US4649611A (en) Method of and apparatus for positioning compressor scroll member
US8166655B2 (en) System for component positioning during assembly of scroll-type fluid machine
JP4735674B2 (ja) 固定スクロールの位置決め方法
JP3894679B2 (ja) スクロール圧縮機の組立方法および組立装置
US20060159578A1 (en) Apparatus and method for aligning scroll compressor
JP2008163847A (ja) 固定スクロールの位置決め装置
JPH09250476A (ja) 回転機械の組み立て方法および組み立て装置
JPS62203901A (ja) スクロ−ル流体機械のスクロ−ル位置決め装置およびその位置決め方法
JP3794231B2 (ja) スクロール流体機械の位置決め方法およびその装置、並びにスクロール流体機械の組み立て方法およびその装置
JP2009056557A (ja) スクリューロータ加工方法及び加工装置

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 20090506

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC MT NL PL PT RO SE SI SK TR

DAX Request for extension of the european patent (deleted)
A4 Supplementary search report drawn up and despatched

Effective date: 20141110

RIC1 Information provided on ipc code assigned before grant

Ipc: F04C 18/02 20060101AFI20141104BHEP

Ipc: F04C 23/00 20060101ALI20141104BHEP

17Q First examination report despatched

Effective date: 20171012

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION HAS BEEN WITHDRAWN

18W Application withdrawn

Effective date: 20190307