JP4179376B2 - Fixed scroll positioning method - Google Patents

Description

  The present invention relates to a method for positioning a fixed scroll when assembling a scroll fluid machine.

  Conventionally, scroll fluid machines are widely used in compressors and the like that are provided in a refrigerant circuit such as an air conditioner and compress refrigerant. In a scroll fluid machine, a spiral wrap is provided on each of a fixed scroll and a movable scroll, and a fluid chamber is formed by meshing the fixed and movable wraps with each other. In this scroll fluid machine, the movable scroll performs a revolving motion, and the volume of the fluid chamber changes accordingly. For example, in a scroll compressor, after the fluid is sucked into the fluid chamber before the closed state, the volume of the fluid chamber in the closed state decreases, and the fluid in the fluid chamber is compressed and discharged. .

  As described above, in the scroll fluid machine, the movable scroll revolves in a state where the wrap meshes with the wrap of the fixed scroll. Here, if the movable scroll lap strongly hits the fixed scroll wrap during the revolution of the movable scroll, the movable scroll does not move smoothly. Therefore, in order to move the movable scroll smoothly, the revolving movable scroll wrap does not hit the fixed scroll wrap strongly (corresponding to the oil film thickness between the movable scroll and the fixed scroll during the revolution). It is necessary to accurately place the fixed scroll at a position where a fine clearance is always formed. For this reason, when assembling the scroll fluid machine, it is necessary to accurately position the fixed scroll. A method for positioning such a fixed scroll is disclosed in Patent Document 1, for example.

  In the second embodiment of the positioning method described in Patent Document 1, a θ table for fixing the fixed scroll and an XY table on which the θ table is placed are provided, and the movable scroll is fixed to the drive shaft. It has become. Then, after obtaining the reference position in the θ direction while rotating the fixed scroll in the θ direction with respect to the movable scroll fixed to the drive shaft, the reference position in the XY direction is obtained by sequentially moving in the X axis direction and the Y axis direction. Thus, the fixed scroll is positioned at the center.

Further, in this Patent Document 1, as the first embodiment, it is also described that positioning is easily performed by obtaining only the reference position in the X-axis direction and the Y-axis direction without obtaining the reference position in the θ direction. Yes.
Japanese Patent Laid-Open No. 2-221893

  However, the method of Example 2 of Patent Document 1 requires a mechanism for obtaining the reference position by rotating the fixed scroll in the θ direction, which complicates the configuration and increases the cycle time required for centering. Moreover, in the method of Example 1 of Patent Document 1, since the fixed scroll is not positioned in the θ direction, the position accuracy of the fixed scroll may be deteriorated.

  The present invention has been made in view of such a point, and an object of the present invention is to enable positioning of the fixed scroll in the θ direction in a short time with high accuracy when positioning the fixed scroll during assembly of the scroll fluid machine. At the same time, it is also possible to prevent the positioning mechanism from becoming complicated.

  The first invention is based on the positional relationship between the wrap (35) of the fixed scroll (34) and the wrap (32) of the movable scroll (31) in the assembly process of the scroll fluid machine (10). Presupposes a method for positioning.

The fixed scroll positioning method includes a movable scroll (31), a crankshaft (20) engaged with the movable scroll (31), and a housing member (36) constituting a bearing of the crankshaft (20). And then, the fixed scroll (34) is positioned on the housing member (36) in the θ direction by the positioning pin (38a), and the fixed scroll (34) is engaged with the movable scroll (31). And a second positioning step in which the fixed scroll (34) is moved in the X-axis direction and the Y-axis direction after the first positioning step, and the second positioning step is performed when the fixed scroll (34) is moved. The inner peripheral surface of the fixed wrap (35) at the portion where the outer peripheral surface of the fixed wrap (35) is separated from the inner peripheral surface of the movable wrap (32) When the roll (31) is reversed and the fixed scroll (34) is pushed back to the movable wrap (32) by contacting the outer peripheral surface of the movable wrap (32), the position of the wrap (32, 35) It is a step of determining the center position of the fixed scroll (34) in the X-axis direction and the Y-axis direction by performing detection as a contact position and detecting the position at a plurality of positions . In this configuration, the X-axis direction and the Y-axis direction are usually determined in directions perpendicular to each other, but may not be completely perpendicular.

  In the first aspect of the invention, the fixed scroll (34) is placed on the housing member (36) supporting the crankshaft (20) with which the movable scroll (31) is engaged, and the fixed scroll (34) is wrapped ( 35) and the wrap (32) of the movable scroll (31) are engaged with each other. When the fixed scroll (34) is placed on the housing member (36), the fixed scroll (34) is provisionally positioned with respect to the XY axis direction using the positioning pins (38a). On the other hand, the positioning pin (38a) has a clearance of about several tens of microns in the holes (34c, 36c) for the positioning pin (38a). Due to this clearance, the fixed scroll (34) rotates in the rotational direction. Even if it shifts in the (θ direction), the influence of the shift is only a ratio of several tens of microns to 360 °, and can be substantially ignored. Therefore, the fixed scroll (34) is finally positioned by the positioning pin (38a) in the θ direction as the first positioning step, and then positioned in the X-axis direction and the Y-axis direction in the second positioning step. The positioning in the X-axis direction and the Y-axis direction may be performed after obtaining the X-axis center and Y-axis center of the fixed scroll (34), for example.

In the first invention, after the first positioning step positions the fixed scroll (34) on the housing member (36) in the θ direction with the positioning pin (38a), the fixed scroll (34) is moved to the housing member (36). ) With a fastening means (38b) and a pre-setting step for extracting the positioning pin (38a), wherein the second positioning step is performed in a state where the fixed scroll (34) is pressed against the housing member (36). A centering step of releasing the fixing by the fastening means (38b) and positioning the fixed scroll (34) in the X-axis direction and the Y-axis direction is included.

In this configuration, in the first positioning step, the fixed scroll (34) is positioned on the housing member (36) in the θ direction by the positioning pin (38a), and then the fixed scroll (34) is mounted on the housing member (36) such as a bolt. While fixing by the fastening means (38b), the work which extracts the said positioning pin (38a) is performed. Then, in the second positioning step, the fixed scroll (34) is pressed against the housing member (36), the fixing by the fastening means (38b) is released, and the fixed scroll (34) is moved in the X-axis direction and the Y-axis direction. The positioning operation is performed.

The second invention is characterized in that, in the first invention, positioning pins (38a) are provided at at least two locations on the outer peripheral edge of the fixed scroll (34).

In the second aspect of the invention, when the positioning pin (38a) is provided on the outer peripheral edge of the fixed scroll (34), the displacement of the fixed scroll (34) in the θ direction due to the clearance is larger than that provided on the inner peripheral part. The impact is reduced.

According to a third invention, in the first or second invention, the fixed scroll (34) in a state where the second positioning step detects the phase or rotational position of the movable scroll (31) by the phase detection mechanism (90). It is the process of positioning.

In the third aspect of the invention, in the second positioning step, the fixed scroll (34) is positioned in the X-axis direction and in the Y-axis direction while the phase of the movable scroll (31) is detected.

In a fourth aspect based on the third aspect , the outer periphery of the movable scroll (31) is attached to the outer peripheral portion of the fixed scroll (34) in a state where the fixed scroll (34) is assembled above the movable scroll (31). A notch (34b) whose part can be observed from above the fixed scroll (34) is formed so as to penetrate the fixed scroll (31) vertically, and the phase detection of the movable scroll (31) in the second positioning step Is characterized by detecting the detection part (31b) provided on the outer periphery of the fixed scroll (34) through the notch (34b).

In the fourth aspect of the invention, when the phase of the movable scroll (31) is detected in the second positioning step, the detection part (31b) on the outer periphery of the movable scroll (31) is notched (34b) of the fixed scroll (34). ).

According to a fifth invention, in any one of the first to fourth inventions, in the state in which the second positioning step presses the fixed scroll (34) against the housing member (36), the fixed scroll (34 ) Is a step of moving the fixed scroll (34) by applying an impact force.

In the fifth aspect of the invention, when the fixed scroll (34) is positioned in the X-axis direction and the Y-axis direction in the second positioning step, the fixed scroll (34) is pressed against the housing member (36) to provide a static friction force. In addition, an impact force is applied in the X-axis direction and the Y-axis direction against this frictional force. As a result, the fixed scroll (34) is finely moved, and the position of the fixed scroll (34) is adjusted.

  According to the present invention, the first positioning step of positioning the fixed scroll (34) on the housing member (36) in the θ direction by the positioning pin (38a), and the fixed scroll (34) after the first positioning step is moved in the X-axis direction. And the second positioning step for positioning in the Y-axis direction, and positioning the fixed scroll (34) in the θ direction is a simple process using the positioning pin (38a), but the positioning pin (38a) and the positioning pin ( Since the clearance of the holes (34c, 36c) for 38a) has little influence on the deviation in the θ direction, the fixed scroll (34) can be positioned with sufficient accuracy in the θ direction. Further, the fixed scroll (34) can be accurately assembled by positioning in the X-axis direction and the Y-axis direction thereafter. Further, since the positioning in the θ direction can be performed by a simple method using the positioning pin (38a), it is possible to prevent the cycle time required for positioning from becoming long and to prevent the mechanism from becoming complicated.

In the first invention, in the first positioning step, the fixed scroll (34) is positioned in the θ direction with the positioning pin (38a) after positioning the fixed scroll (34) on the housing member (36), and then the housing member (36). In the second positioning step, the fixed scroll (34) is pressed against the housing member (36) after being fixed by the fastening means (38b) such as a bolt and extracting the positioning pin (38a). The fixing by the fastening means (38b) is released and the fixed scroll (34) is positioned in the X-axis direction and the Y-axis direction. In this method, the operation of setting the fixed scroll (34) with the positioning pin (38a) with respect to the housing member (36) can be performed manually as a preliminary setup. On the other hand, if all operations are automated, the equipment becomes complicated and the cost increases. However, in the present invention, the equipment can be prevented from becoming complicated and costly. In addition, if the positioning pin (38a) is manually set in the equipment, it is necessary to alternately perform manual work and equipment work. However, according to the present invention, a reduction in productivity can be prevented.

According to the second aspect of the invention, since the positioning pin (38a) is provided on the outer peripheral edge of the fixed scroll (34), the clearance of the fixed scroll (34) by the clearance is larger than that provided on the inner peripheral part. The influence of the direction deviation is reduced, and the positioning accuracy can be increased. In addition, positioning pins (38a) can be positioned more easily at two locations than at three locations. Positioning pins (38a) can be positioned more easily when positioning pins (38a) are provided at at least two locations. It becomes possible.

According to the third invention, in the second positioning step, the fixed scroll (34) is positioned in the X-axis direction and the Y-axis direction in a state where the phase of the movable scroll (31) is detected. 34) can be positioned more accurately.

According to the fourth aspect of the present invention, when the phase of the movable scroll (31) is detected in the second positioning step, the outer peripheral detection portion (31b) of the movable scroll (31) is notched in the fixed scroll (34). It can be detected through (34b). That is, since the phase of the movable scroll (31) can be detected during the positioning process, it is not necessary to detect the phase in advance before positioning, and the process can be simplified.

According to the fifth aspect of the invention, in the second positioning step, the fixed scroll (34) is pressed against the housing member (36) while applying an impact force to the fixed scroll (34). Since 34) is moved, positioning can be performed while finely adjusting the position of the fixed scroll (34). Therefore, the positioning accuracy can be increased.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the following, first, the structure of the scroll compressor (10) assembled using the positioning device (40) that performs the positioning method according to the present embodiment will be described, and then the positioning device (40) and the positioning method will be described. explain.

-Structure of scroll compressor-
As shown in FIG. 1, the scroll compressor (10) is configured in a so-called completely sealed type. The scroll compressor (10) includes a casing (15) formed in a vertically long sealed container shape. The casing (15) includes one body member (16) formed in a vertically long cylindrical shape, and end plate members (one each formed in a bowl shape and attached to the upper end and the lower end of the body member (16)). 17,18).

  In the casing (15), a lower bearing member (23), a compressor motor (25), and a compression mechanism (30) are arranged in order from the bottom to the top. A crankshaft (20) extending vertically is provided inside the casing (15).

  A suction pipe (11) passing through the upper end plate member (17) is fixed to the casing (15), and the suction pipe (11) communicates with the suction port of the compression mechanism (30). The casing (15) is provided with a discharge pipe (12) penetrating the body member (16) at a position 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), and the high pressure gas compressed by the compression mechanism (30) is placed in the space below the compression mechanism (30) in the casing (15). After filling, it is discharged from the discharge pipe (12). In the casing (15), the space (S1) above the compression mechanism (20) is a low-pressure space, and the space (S2) below is a high-pressure space.

  The crankshaft (20) includes a main shaft portion (21) and an eccentric portion (22). The main shaft portion (21) has a slightly larger diameter at its upper end. The eccentric portion (22) is formed in a cylindrical shape having a smaller diameter than the upper end portion of the main shaft portion (21), and is erected on the upper end surface of the main shaft portion (21). The eccentric portion (22) has an axis that is eccentric with respect to the axis of the main shaft portion (21).

  The lower bearing member (23) is fixed near the lower end of the body member (16) of the casing (15). A slide bearing (23a) is formed at the center of the lower bearing member (23), and this slide bearing rotatably supports the lower end portion of the main shaft portion (21).

  The compressor motor (25) is a so-called brushless DC motor. The compressor motor (25) includes a stator (26) and a rotor (27), and constitutes a drive motor. The stator (26) is fixed to the body member (16) of the casing (15). The stator (26) is electrically connected to a power supply terminal (19) attached to the body member (16) of the casing (15). On the other hand, the rotor (27) is disposed inside the stator (26) and is fixed to the main shaft portion (21) of the crankshaft (20).

  The compression mechanism (30) includes a movable scroll (31), a fixed scroll (34), and a housing (36) as a housing member (36).

  The housing (36) is formed in a relatively thick disk shape with a depressed central part, and the outer peripheral part thereof is joined to the upper end part of the body member (16). Further, the main shaft portion (21) of the crankshaft (20) is inserted through the central portion of the housing (36). The housing (36) constitutes a bearing (36a) that rotatably supports the main shaft portion (21) of the crankshaft (20).

  The movable scroll (31) includes a movable side end plate (31a), a spiral wall-like movable side wrap (32) erected on the front side (upper surface side in FIG. 1), and the rear side (lower surface in FIG. 1). And a cylindrical protruding portion (33) protruding to the side). Although not shown in FIG. 1, the movable scroll (31) is placed on the upper surface of the housing (36) via the Oldham ring (39) of FIG. Further, the eccentric part (22) of the crankshaft (20) is inserted into the projecting part (33) of the movable scroll (31). That is, the movable scroll (31) is engaged with the crankshaft (20).

  The fixed scroll (34) is formed in a relatively thick disk shape and has a fixed side end plate (34a). A spiral wall-like fixed side wrap (35) is provided at the center of the fixed scroll (34). The fixed side wrap (35) is formed by carving the fixed scroll (34) from the lower surface side.

  As shown in FIG. 2, in the compression mechanism (30), the fixed side wrap (35) of the fixed scroll (34) and the movable side wrap (32) of the movable scroll (31) are engaged with each other. The fixed side wrap (35) and the movable side wrap (32) mesh with each other, so that the fixed side wrap (35) is fixed between the outer peripheral surface of the fixed side wrap (35) and the inner peripheral surface of the movable side wrap (32). ) And the inner peripheral surface of the movable side wrap (32) are formed with a plurality of compression chambers (37).

-Positioning device for fixed scroll-
The positioning device (40) of the present embodiment positions the fixed scroll (34) based on the positional relationship between the fixed side wrap (35) and the movable side wrap (32) in the process of assembling the scroll compressor (10). Is to do. More specifically, the positioning device (40) is provided with a fixed scroll (34) when the fixed scroll (34) is attached to an assembly (11) to be described later formed in the process of assembling the scroll compressor (10). Is adjusted to optimize the positional relationship between the fixed scroll (34) and the movable scroll (31).

  In the assembly (11), the body member (16), the housing (36), the compressor motor (25), the lower bearing member (23), the crankshaft (20), and the movable scroll (31) are integrally assembled. Is. In this assembly (11), the housing (36), the compressor motor (25), and the lower bearing member (23) are fixed to the body member (16), and the movable scroll (31) is engaged with the crankshaft (20). It is mounted on the housing (36) in a combined state. In this assembly (11), the stator (26) of the compressor motor (25) is electrically connected to the power supply terminal (19).

  The configuration of the positioning device (40) will be described with reference to FIG. The positioning device (40) includes a first frame body (45) and a second frame body (60).

  The first frame body (45) includes a pedestal plate (46) and an upper plate (47), respectively, and four support members (48). The pedestal plate (46) is formed in a square shape and provided substantially horizontally. One support member (48) is erected one by one at the corner of the base plate (46). The support member (48) penetrates the pedestal plate (46), and the lower end of the support member (48) protrudes downward from the pedestal plate (46). The upper plate (47) is fixed to the upper ends of the four upright support members (48).

  On the upper surface of the pedestal plate (46), a cylindrical guide member (50) projects from the center thereof. The guide member (50) is for guiding the body member (16) to a predetermined position when the assembly (11) is placed on the base plate (46), and has an inner diameter of the body member (16). It is slightly larger than the outer diameter. A through hole (52) is formed in the center of the base plate (46). The through hole (52) is a circular hole formed concentrically with the guide member (50), and penetrates the base plate (46).

  A rotary encoder (53) is attached to the lower surface of the base plate (46) via a bracket (54). The rotary encoder (53) is disposed below the through hole (52), and its rotating shaft (53a) extends upward toward the through hole (52). A coupling (55) is attached to the rotary shaft (53a) of the rotary encoder (53). The coupling (55) includes a portion in which an oil pickup (20a) provided at the lower end of the crankshaft (20) projects downward from the through hole (52), and a rotary shaft (53a) of the rotary encoder (53). ). Although not shown in FIG. 1, the oil pickup (20a) is provided integrally with the crankshaft (20) as shown in FIG. This oil pickup is equipped with an oil pump (not shown), and through the oil supply passage (not shown) extending in the vertical direction at the center of the crankshaft (20), the oil pick-up is a sliding portion of the bearing and the compression mechanism (30). To supply.

  A pressing mechanism (56) for pressing the fixed scroll (34) downward is attached to the upper plate (47). The pressing mechanism (56) includes a rod (57a) that extends downward, and is disposed approximately at the center of the upper plate (47). A holding member (58) having a larger cross-sectional area than the rod (57a) is attached to the tip of the rod (57a). A guide (41) to be described later is attached to the lower surface of the pressing member (58). The pressing mechanism (56) moves the presser member (58) and the guide (41) downward by sending out the rod (57a) using an air cylinder (57) or the like, and presses the fixed scroll (34). It is configured to apply pressure.

  The configuration of the guide (41) will be described with reference to FIG. The guide (41) is linearly engaged with the base plate (59), the X-axis rail (49a) and the Y-axis rail (49b) orthogonal to each other, and the X-axis rail (49a) and the Y-axis rail (49b). A bearing (51) and three pressing rods (28) shown in FIG. 3 provided on the lower surface of the base plate (59) are provided.

  The X-axis rail (49a) is composed of two rail members having the same length. These two X-axis rails (49a) are arranged and fixed in parallel at predetermined intervals on the upper surface of the base plate (59). The Y-axis rail (49b) is composed of two rail members having the same length. These two Y-axis rails (49b) are arranged and fixed in parallel on the lower surface of the pressing member (58) at a predetermined interval.

  A spike (28a) for preventing rotation of the fixed scroll (34) is formed at the lower end of each pressing rod (28). When the fixed scroll (34) moves with the guide (41) applying a pressing force to the fixed scroll (34), the fixed rod (28) is fixed to the guide (41). It is intended to prohibit sliding. Since the spike (28a) is formed at the lower end of the holding rod (28), the contact surface between the holding rod (28) and the fixed scroll (34) is in contact with the fixed scroll (34) and the housing (36). A friction force larger than the surface is generated.

  One linear motion bearing (51) is provided at a location where the X-axis rail (49a) and the Y-axis rail (49b) intersect. That is, the guide (41) is provided with a total of four linear motion bearings (51). Each linear motion bearing (51) is a substantially rectangular parallelepiped, and a groove in the X-axis direction is formed on the lower surface, and a groove in the Y-axis direction is formed on the upper surface. Each linear motion bearing (51) has an X-axis rail (49a) fitted in the groove on the lower surface and a Y-axis rail (49b) fitted in the groove on the upper surface. (Right-angled direction) is secured. A number of ball members (not shown) are embedded in the grooves in the X-axis direction and the Y-axis direction of the linear motion bearing (51). Each linear motion bearing (51) is in contact with the X-axis rail (49a) and the Y-axis rail (49b) via a large number of ball members, and has a rolling guide structure that moves straight along the rail. Thus, the guide (41) allows the parallel movement of the fixed scroll (34) in the X-axis direction and the Y-axis direction orthogonal to each other in a state in which a pressing force is applied to the fixed scroll (34). The rotation of the fixed scroll (34) is restricted.

  The second frame body (60) includes one frame-like member (61) and four support members (62), and is fixed on the base plate (46). The length of each support member (62) is slightly shorter than the height of the body member (16) constituting the assembly (11). Each of these four support members (62) is erected on the base plate (46), and is arranged at equal intervals around the guide member (50). The frame member (61) is formed in a quadrangular or circular frame shape, and is placed on the four support members (62). The frame-like member (61) is fixed to each support member (62) and is disposed so as to surround the upper part of the assembly (11).

  The frame-like member (61) is provided with a clamp mechanism (63) for fixing the assembly (11). The clamp mechanism (63) constitutes a fixing member. The clamp mechanism (63) includes a plurality of movable clamp heads (64) protruding inward of the frame-shaped member (61). Then, the clamp mechanism (63) presses the clamp head (64) against the outer peripheral surface of the body member (16) constituting the assembly (11), thereby causing the assembly (11) to move in the radial direction of the body member (16). It is comprised so that an assembly (11) may be restrained by inserting | pinching from both sides. The clamp mechanism (63) may be provided at a total of four locations on the radial lines in the X-axis direction and the Y-axis direction, for example.

  On the frame member (61), there are two position detection mechanisms (65) for detecting the position in the X-axis direction and the position in the Y-axis direction of the fixed scroll (34), and on the X-axis and the Y-axis. A total of four striking units (70) are installed two by two. For example, an electric micrometer (66) can be used as the position detection mechanism (65). The electric micrometer (66) measures the position and dimensions of a measurement object using an electric signal. The position detection mechanism (65) may be replaced with another position measuring device such as a laser displacement meter instead of the electric micrometer (66). The laser displacement meter irradiates a laser beam toward the fixed scroll (34) and measures the displacement amount of the fixed scroll (34) from the reflected light.

  Each striking unit (70) is formed in a columnar shape, and includes a head portion (74) having a protrusion formed on the tip side (see FIG. 6). These four striking units (70) constitute a moving mechanism (75) that applies an impact force to the fixed scroll (34) to move the fixed scroll (34).

  As shown in FIG. 5, the four striking units (70) are arranged radially at intervals of 90 ° around the fixed scroll (34) on the housing (36) of the assembly (11). That is, two striking units (70) are arranged along the first radial direction (X-axis direction) of the fixed scroll (34), and along the second radial direction (Y-axis direction) orthogonal to the radial direction. The remaining two striking units (70) are arranged. Each striking unit (70) has a posture in which the projection of the head portion (74) faces the fixed scroll (34) side. That is, the two striking units (70) arranged along one radial direction face each other across the fixed scroll (34).

  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). That is, the X-axis direction and the Y-axis direction in which the guide (41) allows the movement of the fixed scroll (34) coincides with the direction of the impact force applied to the fixed scroll (34) by the hitting unit (70). Yes. When an impact force in the X-axis direction is applied to the fixed scroll (34) by the hitting unit (70), the X-axis rail (49a) is guided in the X-axis groove of the linear motion bearing (51), and the fixed scroll ( 34) moves in the X-axis direction. When an impact force in the Y-axis direction is applied to the fixed scroll (34) by the striking unit (70), the Y-axis rail (49b) is guided to the groove in the Y-axis direction of the linear motion bearing (51), and the fixed scroll ( 34) moves in the Y-axis direction.

  The configuration of the striking unit (70) will be described with reference to FIG. The striking unit (70) includes one main body (71) and one air cylinder (100). The main body part (71) and the air cylinder part (100) have a generally cylindrical shape and are arranged coaxially.

  The main body portion (71) includes a base portion (72), a piezoelectric element (73), and a head portion (74), and is formed in a cylindrical shape as a whole. Specifically, in the main body portion (71), a base portion (72) and a head portion (74), both of which are formed in a cylindrical shape, are arranged coaxially, and a piezoelectric element is interposed between the base portion (72) and the head portion (74). (73) is sandwiched. Further, a protrusion is formed on the tip side of the head portion (74) (that is, the side opposite to the piezoelectric element (73)). When a voltage is applied to the piezoelectric element (73) in the main body (71), the piezoelectric element (73) expands in the axial direction of the main body (71), and the head (74) is pushed out accordingly (FIG. 6). (See (B)). On the other hand, when energization to the piezoelectric element (73) is stopped, the length of the piezoelectric element (73) returns to the original, and the head portion (74) is pulled back accordingly (see FIG. 6A).

  The air cylinder part (100) includes a cylinder (101), a piston (102), and a rod (103). The cylinder (101) is formed in a hollow cylindrical shape. The piston (102) is inserted into the cylinder (101) and is movable in the axial direction of the cylinder (101). The rod (103) is arranged coaxially with the cylinder (101). The rod (103) has a proximal end connected to the piston (102) and a distal end extending to the outside of the cylinder (101). The tip of the rod (103) is joined to the end surface of the base (72) of the main body (71). The interior of the cylinder (101) is partitioned into a first air chamber (104) and a second air chamber (105) by a piston (102). A first air pipe (106) is connected to the first air chamber (104) opposite to the rod (103). On the other hand, a second air pipe (107) is connected to the second air chamber (105) on the rod (103) side.

  In the striking unit (70), air is supplied from the first air pipe (106) to the first air chamber (104) and at the same time, air is discharged from the second air chamber (105) to the second air pipe (107). Then, the piston (102) moves to the second air chamber (105) side, and the main body (71) is sent to the tip side (left side in FIG. 6) of the striking unit (70). In addition, when air is supplied from the second air pipe (107) to the second air chamber (105) and simultaneously air is discharged from the first air chamber (104) to the first air pipe (106), the piston ( 102) moves to the first air chamber (104) side, and the main body (71) is pulled back to the base end side (right side in FIG. 6) of the striking unit (70).

  As shown in FIG. 7, the positioning device (40) is provided with an inverter (81), a driver (82) of the inverter (81), and a controller (control means) (80). Among these, the inverter (81) and the driver (82) constitute a power feeding means (83).

  The inverter (81) has an input side connected to the commercial power source (85) and an output side connected to the power supply terminal (19) of the assembly (11). On the other hand, the output signal of the rotary encoder (53) is input to the driver (82).

  Although not shown in FIG. 7, the positioning device (40) is provided with a laser displacement meter (91) for measuring the phase of the crankshaft (20) (see FIG. 18). This phase measurement laser displacement meter (91) measures the phase of the crankshaft (20) and the movable scroll (31), and includes the rotary encoder (53) and the phase detection mechanism (90) of the present invention. It is composed.

  The driver (82) calculates the rotation angle and angular velocity of the crankshaft (20) based on the output signal of the rotary encoder (53), and outputs the command value related to the output current value and output frequency of the inverter (81) accordingly. Determine. Then, the driver (82) outputs a command such as a switching timing to the inverter (81) so that the output of the inverter (81) corresponds to the command value. The inverter (81) operates in response to a command from the driver (82) and supplies an alternating current to the compressor motor (25) of the assembly (11). A command value related to the output current of the inverter (81) and information related to the rotation angle of the crankshaft (20) are input from the driver (82) to the controller (80).

The controller (80) detects a predetermined rotational position (phase) while the crankshaft (20) is rotating, while detecting the predetermined rotational position (phase) with the rotary encoder (53), based on the phase or rotational angle of the movable scroll (31). To determine the direction of movement of the fixed scroll (34) and the batting unit (70)
After moving the outer peripheral surface of the fixed side wrap (35) by a predetermined distance (several microns to about 10 microns) in a direction away from the inner peripheral surface of the movable side wrap (32) at a predetermined position, the movable scroll (31) Is controlled to reverse about 180 °. At this time, when the outer peripheral surface of the movable wrap (32) comes into contact with the inner peripheral surface of the fixed wrap (35), the fixed scroll (34) is moved by the repulsive force of the movable wrap (32). When the movement of the fixed scroll (34) is detected by the electric micrometer (66), the position is recognized as the limit point of the movable range of the fixed scroll (34). On the other hand, if the fixed scroll (34) does not move even if the movable scroll (31) is reversed after striking the fixed scroll (34), the laps (31, 35) are not yet in contact, and the limit of the movable range Since it is considered that the point has not been reached, the hit of the fixed scroll (34) and the reversal of the movable scroll (31) are repeated until both laps (31, 35) contact.

  If this operation is performed in the positive direction (first direction) and the negative direction (second direction) of the X axis, both ends of the movable range of the X axis of the fixed scroll (34) can be detected. Move to the center of the movable range of the shaft. Next, after the same operation is performed in the positive and negative directions of the Y axis, the movable scroll (31) is moved to the center of the movable range of the Y axis. At this time, the fixed scroll (34) is positioned substantially at the center, but since the first centering in the X-axis direction is performed without the center of the Y-axis, in this embodiment, the centering is more reliably performed. In order to carry out, the same operation is again performed in the positive direction and the negative direction of the X axis, and control is performed to set the fixed scroll (34) at the center of the movable range.

  Specific control of the batting unit (70) is as follows. When the moving direction of the fixed scroll (34) is determined from the signal of the phase detection mechanism (90), the controller (80) controls the striking unit (70) corresponding to the moving direction. Specifically, the controller (80) starts from the first air pipe (106) to the first air chamber (106) so that the protrusion of the head part (74) of the striking unit (70) contacts the fixed scroll (34). At the same time as air is supplied to 104), air is discharged from the second air chamber (105) to the second air pipe (107) to move the main body (71). When the striking unit (70) is moved, the controller (80) applies a pulse voltage to the piezoelectric element (73) of the striking unit (70). When a pulse voltage is applied to the piezoelectric element (73) of the striking unit (70), the piezoelectric element (73) expands and contracts according to the pulse waveform. At this time, the inertial force of the head portion (74) pushed along with the extension of the piezoelectric element (73) acts on the fixed scroll (34), and the fixed scroll (34) is slightly (several microns to about 10 microns). )Moving. When the fixed scroll (34) moves, the head (74) moves away from the fixed scroll (34), so the striking unit (70) moves again so that the protrusion of the head (74) contacts the fixed scroll (34). Let Then, a pulse voltage is applied again to the piezoelectric element (73) of the striking unit (70). Then, the fixed scroll (34) slightly moves due to the expansion and contraction of the piezoelectric element (73). By repeating this, the fixed scroll (34) pressed against the housing (36) gradually moves. When the movement of the fixed scroll (34) is completed, the controller (80) supplies air from the second air pipe (107) to the second air chamber (105) and at the same time from the first air chamber (104). Air is discharged to the pipe (106), and the striking unit (70) is returned to its original position.

  The operation of the controller (80) will be described with reference to FIG. Note that “right”, “left”, “upper”, and “lower” in this paragraph all mean those in FIG. For example, when moving the fixed scroll (34) to the left (or right) of the X axis, the controller (80) controls the right (or left) striking unit (70). Specifically, the controller (80) moves the main body (71) by adjusting the amount of air in the first air chamber (104) and the second air chamber (105) of the air cylinder (100). However, a pulse voltage is supplied to the piezoelectric element (73) of the main body (71), and a leftward (or rightward) impact force is applied to the fixed scroll (34). Further, when the fixed scroll (34) is moved to the lower side (or upper side) of the Y axis, the controller (80) controls the upper (or lower) striking unit (70).

-Structure of fixed scroll and movable scroll-
FIG. 8 shows an assembly (11) in which a body member (16), a housing (36), a compressor motor (25), a lower bearing member (23), a crankshaft (20), and a movable scroll (31) are assembled. FIG. 9 is a plan view of the fixed scroll (34) set. FIG. 10 is a plan view of the movable scroll (31), and FIG. 11 is a plan view of the fixed scroll (34).

  The movable scroll (31) has outer peripheral convex portions (31b) for projecting toward the outer periphery in the radial direction for dynamic balance at three locations on the outer peripheral surface of the fixed side end plate (34a). The fixed scroll (34) has notches (34b) for weight reduction at three locations on the outer peripheral edge of the fixed side end plate (34a).

  As shown in FIG. 8, the housing (36) is provided with attachment portions (36b) for attaching the fixed scroll (34) at four locations. The fixing portion (36b) is fastened with two housing-side positioning pin holes (36c) into which positioning pins (38a) (see FIG. 14) for positioning the fixed scroll (34) are driven, and the fixed scroll (34). Five bolt holes (36d) for fastening with bolts (38b) (see FIG. 15) as means are formed.

  In the fixed scroll (34), two fixed scroll side positioning pin holes (34c) are formed at positions corresponding to the housing side positioning pin holes (36c), and positions corresponding to the bolt holes (36d) of the housing (36). And five bolt through holes (34d). The fixed scroll (34) is temporarily positioned with respect to the housing (36) by the positioning pins (38a), and then fixed to the housing (36) with bolts (38b). This state is shown in FIG.

  In the state of FIG. 9, the rotation of the movable scroll (31) can be observed from the movement of the outer peripheral convex portion (31b) which is also the detection portion through the notch (34b) of the fixed scroll (34). In this way, the outer peripheral convex portion (31b) of the movable scroll (31) can be observed from the notch (34b) of the fixed scroll (34). 91) sensor part (92) (see FIG. 18) is positioned above notch (34b) to detect outer peripheral convex part (31b) of movable scroll (31), and this outer peripheral convex part (31b) This is because the phase of the crankshaft (20), that is, the phase of the movable scroll (31) is detected during the rotation of the compressor motor (25) based on the position and the rotational position signal of the rotary encoder (53).

  Each positioning pin hole (34c, 36c) is formed in the outer peripheral edge of the housing (36) and the fixed scroll (34). The clearance of the positioning pin holes (34c, 36c) with respect to the positioning pin (38a) is set to an accuracy of, for example, 30 μm ± 10 μm with respect to the diameter. Here, assuming that the pitch circle diameter of the positioning pin holes (34c, 36c) is φ130 mm, the positional deviation in the rotation (θ) direction is about 1.5 μm or less although it differs slightly depending on the basic circle diameter. Sufficient positional accuracy can be obtained.

-Positioning method for fixed scroll (34)-
Next, regarding a positioning method of the fixed scroll (34) performed using the positioning device (40), a fixing step (first positioning step) including a pre-positioning of the positioning of the fixed scroll (34), and a fixed scroll (34) ) And the positioning step (second positioning step) including centering, and these will be described in order.

  The pre-setup process for positioning the fixed scroll (34) is shown in FIGS. 12, the assembly (11) before mounting the movable scroll (31) on the crankshaft (20) is placed on the transport pallet (95) with the housing (36) positioned on the upper side. In this state, refrigerating machine oil (96) used as lubricating oil is poured into the bearing (36a) of the housing (36). As the lubricating oil (96), a refrigerating machine oil (96) having a viscosity lower than that of the refrigerating machine oil (96) used in the scroll compressor (10) after assembly is used. For example, assuming that the refrigerating machine oil (96) used after assembling the compressor is VG68, a low-viscosity oil such as VG32 or VG22 is used as the lubricating oil (96) during the assembling process. When high-viscosity oil is used, the oil is not uniformly supplied to the bearing, especially at low outside temperatures, and the oil film thickness becomes non-uniform at low speed rotation, such as when performing the positioning process. While there is a risk of assembly in a shifted state, the use of low-viscosity oil in this way can avoid the risk of misalignment of the crankshaft (20) during assembly. If low-viscosity oil is supplied in advance to the bearing (23a) of the lower bearing member (23), it is possible to more effectively prevent misalignment of the crankshaft (20).

  In the second pre-setup process of FIG. 13, the Oldham ring (39) and the movable scroll (31) are assembled to the assembly (11), and lubricating oil (96) is injected into the sliding portion. The lubricating oil (96) also uses a refrigerating machine oil (96) having a lower viscosity than the refrigerating machine oil (96) of the scroll compressor (10) after assembly.

  14, the fixed scroll (34) is placed on the housing (36) and the movable scroll (31) so that the fixed wrap (35) and the movable wrap (32) are engaged with each other. Then, the fixed scroll (34) is provisionally positioned with respect to the XY axis directions using the positioning pins (38a). However, as described above, the fixed scroll (34) is positioned with sufficient accuracy in the θ direction because of the relationship between the pitch circle diameter of the positioning pin (38a) and the clearance. 38a) is the final positioning means.

  15, the fixed scroll (34) is fastened to the housing (31) with a bolt (38b) while the positioning pin (38a) is inserted into the positioning pin hole (34c, 36c), and the fixed scroll (34 ) Is temporarily fixed.

  In the fifth pre-setup step in FIG. 16, the work of extracting the positioning pin (38a) is performed. Since all the steps of the pre-setup are thus completed, the assembly (11) is carried into the centering assembly facility (positioning device (40)) as shown in FIG. In FIG. 17, the centering assembly facility (40) is shown in a simplified manner.

  Next, each centering process (second positioning process) will be described.

  FIG. 18 shows a state in which the assembly (11) is carried into the centering assembly facility (40). If this state is the first centering step, in this first centering step, the assembly (11) is placed on the base plate (46) together with the transport pallet (95) with the housing (36) positioned upward. (The conveyance pallet (95) is omitted in FIGS. 3 and 7), and around the assembly (11), a pressing mechanism (56), a clamping mechanism (63), a striking unit (70), The rotary encoder (53) and coupling (55), position detection mechanism (65), phase detection mechanism (90), nut runner (97), power supply connector (42), etc. not shown in FIG. Yes. The process drawings after FIG. 18 are diagrams showing the operation image of each process, and the specific structures of details regarding the clamp mechanism (63) and the striking unit (70) are slightly different from those of FIGS. Since there is no functional difference from that of FIG. 3 or FIG. 7, the operation will be described below using this image diagram.

  When the assembly (11) is placed on the base plate (46), the lower end of the body member (16) (or the transport pallet (95)) is located inside the guide member (50) as shown in FIGS. The lower end surface of the crankshaft (20) is positioned above the through hole (52), and the oil pickup (20a) projects downward from the through hole (52).

  In the second centering step of FIG. 19, the clamp head (64) of the clamp mechanism (63) is pressed against the outer peripheral surface of the body member (16) of the assembly (11) to fix the assembly (11) from the periphery. The power supply connector (42) is connected to the power supply terminal (19). In addition, the rotary shaft (53a) of the rotary encoder (53) is coupled to the oil pickup (20a) of the crankshaft (20) by a coupling (55) and the air cylinder (57) of the pressing mechanism (56) is operated. The fixed scroll (34) is pressed against the housing (36) of the assembly (11).

  In the third centering step of FIG. 20, the nut runner (97) is lowered and the bolt (38b) is loosened. This is because, with the bolt (38b) still tightened, the movement (position adjustment) of the fixed scroll (34) that is performed later using the striking unit (70) cannot be performed.

  When the work of loosening the bolt (38b) is finished, the fourth centering step shown in FIG. 21 is performed. In the fourth step, the nut runner (97) is raised and the laser displacement meter (91) of the phase detection mechanism (90) is advanced. At this time, the sensor part (92) of the laser displacement meter (91) is positioned above the notch (34b) (see FIG. 9) of the fixed scroll (34).

  Then, in the fifth centering step of FIG. 22, the compressor (25) is energized from the inverter (81) by the driver (82) of FIG. 7, and the crankshaft (20) is driven at a low speed of about 4 revolutions per second, for example. The outer peripheral projection (31b) of the movable scroll (31) is detected through the notch (34b) of the fixed scroll (34) with the laser displacement meter (91). Then, the driver (82) detects the phase of the crankshaft (20), that is, the phase of the movable scroll (31) based on the position of the outer peripheral convex portion (31b) and the rotational position signal of the rotary encoder (53). To do.

  When the phase detection of the movable scroll (31) is completed, the sixth centering process shown in FIG. 23 is performed. In the sixth step, the laser displacement meter (91) of the phase detection mechanism (90) is moved backward, and the striking unit (70) is moved forward. The position of the fixed scroll (34) is detected by advancing both the electric micrometer (66), which is the position detection mechanism (65), on the X axis and the Y axis. Make it ready.

  In the seventh centering step shown in FIG. 24, the fixed scroll (34) is moved by the striking unit (70) while the crankshaft (20) and the movable scroll (31) are rotated by the compressor motor (25). To position. At this time, the first centering operation for once detecting the both ends of the movable range of the fixed scroll (34) in the X-axis direction and positioning the fixed scroll (34) at the center position, and the fixed scroll (34) in the Y-axis direction. The second centering operation of detecting both ends of the movable range and positioning the fixed scroll (34) at the center position, and again detecting both ends of the movable range of the fixed scroll (34) in the X-axis direction A third centering operation for positioning the fixed scroll (34) is sequentially performed.

  In each centering operation, the phase or rotation angle of the fixed scroll (34) is detected. Based on this phase, first, the fixed-side wrap at a predetermined position (a position where the gap is narrow or is in contact). The fixed scroll (34) is moved in the minus direction (or plus direction) of the X axis so that the outer peripheral surface of (35) moves away from the inner peripheral surface of the movable wrap (32). This is because, as shown in FIG. 25, when the impact unit (70) on the right side of the figure is operated in a state where the movable scroll (31) is at the positive end of the X axis (right side end in the figure), the pressing mechanism (56) Although the rotation of the fixed scroll (34) is restricted by this, the impact force may exceed the frictional force and the fixed scroll (34) may rotate, which may result in inaccurate positioning accuracy. Because there is.

  Therefore, in the present embodiment, as shown in FIG. 26, the striking unit (70) on the right side of the figure is operated in a state where the movable scroll (31) is at the negative end (left side of the figure) of the X axis. Then, it is determined whether or not the fixed scroll (34) is displaced when the movable scroll (31) is reversed. If no displacement of the fixed scroll (34) is detected, both wraps (32, 35) are in contact with each other. Since there is no such thing, hitting the fixed scroll (34) and reversing the movable scroll (31) are repeated. On the other hand, when the movement of the fixed scroll (34) is detected, it is determined that both the wraps (32, 35) are in contact with each other and the fixed scroll (34) is pushed back, and that position is determined as one end of the movable range. A similar operation is performed in the positive direction (or negative direction) of the X axis to detect the other end of the movable range of both laps (32, 35). In this way, the contact position of both wraps (32, 35) is detected at two places (a plurality of places) in the minus direction and the plus direction with respect to the X axis and the Y axis, and the fixed scroll (34) is positioned at the center thereof.

  The specific contents of the first to third centering operations are as follows.

  First, in the first centering operation, the fixed side wrap (35) and the movable side wrap (32) are moved by repeating the movement of the fixed scroll (34) in the negative direction of the X axis and the reverse of the movable scroll (31). The position where contact is detected is set as the first contact position in the X-axis direction, and then the fixed scroll (34) is moved in the positive direction of the X-axis and the movable scroll (31) is reversed, so that the fixed-side wrap ( 35) and the position where the movable side wrap (32) is detected as the second contact position in the X-axis direction, and the central position between the first contact position and the second contact position is the X-axis direction of the fixed scroll (34). The center position of.

  In the second centering operation, the fixed side wrap (35) and the movable side wrap (32) are moved by repeating the movement of the fixed scroll (34) in the negative direction of the Y axis and the reverse of the movable scroll (31). After the position where the contact is detected is set as the first contact position in the Y-axis direction, the movement of the fixed scroll (34) in the plus direction of the Y-axis and the reversal of the movable scroll (31) are repeated, and the fixed-side wrap ( 35) and the position where the movable side wrap (32) is detected as the second contact position in the Y-axis direction, and the central position between the first contact position and the second contact position is the Y-axis direction of the fixed scroll (34). The center position of.

  Further, in the third centering operation, the fixed side wrap (35) and the movable side wrap (32) are moved by repeating the movement of the fixed scroll (34) in the negative direction of the X axis and the reverse of the movable scroll (31). The position where contact is detected is set as the first contact position in the X-axis direction, and then the fixed scroll (34) is moved in the positive direction of the X-axis and the movable scroll (31) is reversed, so that the fixed-side wrap ( 35) and the position where the movable side wrap (32) is detected as the second contact position in the X-axis direction, and the central position between the first contact position and the second contact position is the X-axis direction of the fixed scroll (34). The center position of.

  As described above, in the seventh centering step, after detecting both ends of the movable range of the fixed scroll (34) in the X-axis direction and the Y-axis direction, the fixed scroll (34) is positioned at the center of the movable range. By performing the first to third centering operations, the center of the fixed scroll (34) is obtained and the fixed scroll (34) is positioned.

  When the fixed scroll (34) is moved by the striking unit (70) in the seventh centering step, the moving direction of the fixed scroll (34) is changed in the X-axis direction and the Y-axis direction by the guide (41) of the pressing mechanism (56). In addition, the fixed scroll (34) does not rotate because the wrap (32, 35) is struck in the direction where the laps (32, 35) are separated from each other at a predetermined position (a position where the gap is narrow or in contact). Translate to.

  When the positioning of the fixed scroll (34) is completed, the eighth centering step shown in FIG. 27 is performed. In the eighth centering step, first, power to the compressor motor (25) is stopped, and the rotation of the crankshaft (20) and the movable scroll (31) is stopped. Then, the striking unit (70) and the electric micrometer 66) are retracted, the nut runner (97) is lowered, the bolt (38b) is tightened, and the fixed scroll (34) is fastened to the housing (36). At this time, the fixed scroll (34) is accurately positioned.

  Thereafter, the process proceeds to the ninth centering step shown in FIG. In the ninth centering step, the nut runner (97) rises and the rod (57a) of the air cylinder (57) moves backward to raise the pressing member (58) of the pressing mechanism (56). In addition, the rotary encoder (53) and the coupling (55) are integrally lowered to disengage from the oil pickup (20a) of the crankshaft (20), and the clamp mechanism (63) is retracted and the power supply connector (42) is Retreat and disengage from the power supply terminal (19).

  Thus, all the steps for positioning the fixed scroll (34) are completed. Then, as shown in FIG. 29, a workpiece unloading process is performed for unloading the assembly (11) from the positioning device (40) which is a centering assembly facility.

-Effect of the embodiment-
According to this embodiment, the first positioning step of positioning the fixed scroll (34) on the housing member (36) in the θ direction by the positioning pin (38a), and the fixed scroll (34) after the first positioning step is moved to the X axis. And the second positioning step for positioning in the Y-axis direction, positioning the fixed scroll (34) in the θ direction is a simple process using the positioning pin (38a). The positioning pin (38a) and positioning pin Since the clearance of the (38a) holes (34c, 36c) has little influence on the deviation in the θ direction, the fixed scroll (34) can be positioned with sufficient accuracy in the θ direction. Further, the fixed scroll (34) can be accurately assembled by positioning in the X-axis direction and the Y-axis direction thereafter. Further, since the positioning in the θ direction can be performed by a simple method using the positioning pins (38a), it is possible to prevent the cycle time required for positioning from becoming long and to prevent the mechanism from becoming complicated.

  Further, since the positioning pin (38a) is provided on the outer peripheral edge of the fixed scroll (34), the influence of the deviation in the θ direction of the fixed scroll (34) due to the clearance is smaller than that provided in the inner peripheral part. Thus, positioning accuracy can be increased. Note that positioning pins (38a) can be positioned more easily at two locations than at three locations, and positioning can be ensured by positioning pins (38a) at least at two locations. It becomes possible.

  Further, in the first positioning step, the fixed scroll (34) is positioned on the housing member (36) in the θ direction by the positioning pin (38a), and then the fixed scroll (34) is fixed to the housing member (36) by the bolt (38b). After fixing the positioning pin (38a) and releasing the positioning pin (38a), in the second positioning step, the fixed scroll (34) is pressed against the housing member (36), and the fixing by the bolt (38b) is released. Thus, the fixed scroll (34) is positioned in the X-axis direction and the Y-axis direction. In this method, the operation of setting the fixed scroll (34) with respect to the housing member (36) with the positioning pins (38a) can be performed manually as a pre-setup process. On the other hand, if all the operations are automated, the equipment becomes complicated and the cost increases, but in this embodiment, the equipment can be prevented from becoming complicated and costly. In addition, if the positioning pin (38a) is manually set in the equipment, it is necessary to alternately perform manual work and equipment work. However, according to the present embodiment, it is possible to prevent a decrease in productivity.

  Furthermore, in the present embodiment, in the second positioning step, the fixed scroll (34) is positioned in the X-axis direction and the Y-axis direction with the phase of the movable scroll (31) detected, so the fixed scroll (34) Can be positioned more accurately.

  Further, when detecting the phase of the movable scroll (31) in the second positioning step, the outer peripheral convex portion (31b) of the movable scroll (31) can be detected through the notch (34b) of the fixed scroll (34). it can. That is, since the phase of the movable scroll (31) can be detected during the positioning process, it is not necessary to detect the phase in advance before positioning, and the process can be simplified.

  Further, in the present embodiment, in the second positioning step, the fixed scroll (34) is pressed by applying an impact force to the fixed scroll (34) in a state where the fixed scroll (34) is pressed against the housing member (36). Therefore, positioning can be performed while finely adjusting the position of the fixed scroll (34). Therefore, the positioning accuracy can be increased.

<< Other Embodiments >>
About the said embodiment, it is good also as the following structures.

  For example, in the above-described embodiment, the air cylinder portion (100) is used to move the head portion (74) of the unit (70) forward and backward for striking, but a crank mechanism, a cam mechanism, or the like may be used instead. Further, the striking unit (70), which is a means for moving the fixed scroll (34), does not necessarily have a configuration using the piezoelectric element (73), but uses a moving mechanism (75) using a feed mechanism using a ball screw. It is also possible to employ other configurations. In short, the configuration of the moving mechanism (75) may be appropriately changed as long as the mechanism can adjust the position of the fixed scroll (34).

  Further, in the above embodiment, the fixed scroll (34) is positioned while rotating the movable scroll (31). However, the movable scroll (31) is stopped at a predetermined position and the fixed scroll (34) is moved. The hit and the movable scroll (31) may be reversed to perform positioning in the X-axis direction or the Y-axis direction.

  In the above embodiment, the phase of the movable scroll (31) is detected by the laser displacement meter (91) through the notch (34b) of the movable scroll (31) after the fixed scroll (34) is assembled to the assembly (11). However, before assembling the movable scroll (31) and fixed scroll (34) to the assembly (11), the eccentric part (22) of the crankshaft (20) is preliminarily connected to a phase detection mechanism (such as a laser displacement meter). 90).

  In short, the present invention is characterized in that the positioning of the fixed scroll (34) in the θ direction can be easily and accurately performed by the positioning pin (38a), and other specific configurations are appropriately changed. Also good.

  In addition, the above embodiment is an essentially preferable illustration, Comprising: It does not intend restrict | limiting the range of this invention, its application thing, or its use.

  As described above, the present invention is useful for a method for positioning a fixed scroll when assembling a scroll fluid machine.

It is a longitudinal cross-sectional view of the scroll compressor which concerns on embodiment of this invention. It is a cross-sectional view of a compression mechanism. 1 is a structural diagram of a positioning device according to an embodiment of the present invention. It is a perspective view which shows the XY guide of a positioning device. It is an arrangement plan of a hitting unit in a positioning device. It is a structural diagram of a striking unit. It is a block diagram which shows control of a positioning device. It is a top view of the assembly before attaching a fixed scroll. It is a top view of the assembly after attaching a fixed scroll. It is a top view of a movable scroll. It is a top view of a fixed scroll. FIG. 3 is a first step diagram of the pre-setup of the positioning method according to the present invention. It is a pre-setup 2nd process drawing of the positioning method which concerns on this invention. It is a pre-setup 3rd process drawing of the positioning method which concerns on this invention. It is a 4th step figure of the front setup of the positioning method which concerns on this invention. It is a pre-setup 5th process drawing of the positioning method which concerns on this invention. It is a figure which shows the process of carrying an assembly into a positioning device. It is a centering 1st process drawing of the positioning method which concerns on this invention. It is a centering 2nd process drawing of the positioning method which concerns on this invention. It is a centering 3rd process drawing of the positioning method which concerns on this invention. It is a centering 4th process drawing of the positioning method which concerns on this invention. It is a centering 5th process drawing of the positioning method which concerns on this invention. It is a 6th centering process figure of centering of the positioning method concerning the present invention. It is a centering 7th process drawing of the positioning method which concerns on this invention. It is a top view which shows the relationship between the position of a fixed scroll, and a striking unit. It is a top view which shows the relationship between the position of a fixed scroll, and a striking unit. It is a centering 8th process drawing of the positioning method which concerns on this invention. It is a centering 9th process drawing of the positioning method which concerns on this invention. It is a figure which shows the process of carrying out an assembly from a positioning device.

Explanation of symbols

10 Scroll fluid machinery (scroll compressor)
20 crankshaft
31 Moveable scroll
31b Peripheral convex part (detection part)
32 wraps
34 Fixed scroll
34b cutout
35 wraps
36 Housing (housing member)
38a Locating pin
38b bolt (fastening means)
90 Phase detection mechanism

Claims (5)

In the assembly process of the scroll fluid machine (10), the fixed scroll (34) is based on the positional relationship between the fixed side wrap (35) of the fixed scroll (34) and the movable side wrap (32) of the movable scroll (31). A method for positioning
After combining the movable scroll (31), the crankshaft (20) engaged with the movable scroll (31), and the housing member (36) constituting the bearing of the crankshaft (20), the housing member (36 ), The first positioning step of positioning the fixed scroll (34) in the θ direction with the positioning pin (38a) and meshing the fixed scroll (34) with the movable scroll (31);
A second positioning step of positioning the fixed scroll (34) in the X-axis direction and the Y-axis direction after the first positioning step,
In the second positioning step, the inner peripheral surface of the fixed side wrap (35) in a portion where the outer peripheral surface of the fixed side wrap (35) is separated from the inner peripheral surface of the movable side wrap (32) when the fixed scroll (34) is moved. When the movable scroll (31) is reversed after the fixed scroll (34) is moved and the fixed scroll (34) is pushed back to the movable wrap (32) by contacting the outer peripheral surface of the movable wrap (32) The position is detected as a contact position between the laps (32, 35), and the position is detected at a plurality of locations, thereby determining the center positions of the fixed scroll (34) in the X-axis direction and the Y-axis direction and performing positioning. Process ,
In the first positioning step, the fixed scroll (34) is positioned on the housing member (36) in the θ direction by the positioning pin (38a), and then the fixed scroll (34) is fixed to the housing member (36) by the fastening means (38b). Including a pre-setting step of fixing and extracting the positioning pin (38a),
In the second positioning step, the fixed scroll (34) is released from the fastening means (38b) while the fixed scroll (34) is pressed against the housing member (36), and the fixed scroll (34) is moved in the X-axis direction and the Y-axis direction. A fixed scroll positioning method comprising a centering step of positioning. In claim 1,
A positioning method for a fixed scroll, wherein positioning pins (38a) are provided at at least two locations on the outer peripheral edge of the fixed scroll (34). In claim 1 or 2,
The second positioning step is a step of positioning the fixed scroll (34) in a state where the phase or rotational position of the movable scroll (31) is detected by the phase detection mechanism (90). Method. In claim 3,
The outer periphery of the fixed scroll (34) is observed from above the fixed scroll (34) while the fixed scroll (34) is assembled above the movable scroll (31). A possible notch (34b) is formed through the fixed scroll (31) up and down,
The phase detection of the movable scroll (31) in the second positioning step is performed by detecting a detection portion (31b) provided on the outer periphery of the fixed scroll (34) through the notch (34b). Scroll positioning method. In any one of Claims 1-4,
The second positioning step is a step of moving the fixed scroll (34) by applying an impact force to the fixed scroll (34) in a state where the fixed scroll (34) is pressed against the housing member (36). A fixed scroll positioning method characterized by the above.

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