JP3816211B2 - Scroll compressor centering method and centering apparatus - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a centering method and a centering device for a scroll compressor when the scroll compressor is assembled in a state where a fixed scroll and a turning scroll are engaged with each other.
[0002]
[Prior art]
FIGS. 8A to 8C are explanatory views showing a conventional centering method of the scroll compressor 81 (see Japanese Patent Application Laid-Open No. Hei 2-216993). A fixed scroll 81 and a turning scroll 82 of the scroll compressor are respectively shown in FIGS. The engaged state is shown.
[0003]
In this conventional centering method, first, as shown in FIG. 8A, the fixed scroll 82 is fixed at an angle indicated by Z1 in the drawing, and the fixed scroll 82 is rotated until it contacts the orbiting scroll 81. Move toward the center, measure the coordinates, and then return to the original position. Next, as shown in FIG. 8 (b), the fixed scroll 82 is moved and fixed to the angle indicated by Z2 in the figure, and the fixed scroll 82 is rotated until it contacts the orbiting scroll 81 as described above. Move toward the center, measure the coordinates, and then return to the original position. Further, as shown in FIG. 8C, the fixed scroll 82 is moved and fixed to the angle indicated by Z3 in the figure, and is moved toward the center of rotation until the fixed scroll 82 contacts the orbiting scroll 81. Then, after measuring the coordinates, it returns to the original position.
[0004]
Then, as shown in FIG. 9, the angle Z4 of the fixed scroll 82 with the maximum movement amount is calculated from the relationship between the coordinates of the fixed scroll 82 using the coordinates measured at the respective angles Z1 to Z3. Was centering.
[0005]
[Problems to be solved by the invention]
However, in the centering method, when the coordinates of the fixed scroll 82 are measured at the respective angles Z1 to Z3, the fixed scroll 82 is brought into contact with the orbiting scroll 81 while the fixed scroll 82 is in contact with the orbiting scroll 81. Had to wait for a certain period of time to stabilize. In addition, after the measurement, it is necessary to return the fixed scroll, and there is a problem that it takes a measurement time.
[0006]
Furthermore, in the graph 83 showing the relationship between the angle of the orbiting scroll 82 and the amount of movement of the fixed scroll 81 shown in FIG. 9, the inclination α of the increasing straight line portion 84 of the graph 83 between the angle Z1 and the angle Z4 is the angle Although it can be obtained almost accurately from the amount of movement between Z1 and angle Z2, the slope β of the decreasing straight line portion 85 of the graph 83 on the angle Z3 side from the angle Z4 cannot be obtained accurately. Therefore, the inclination β of the decreasing straight line portion 85 on the side of the angle Z3 from the angle Z4 is determined based on the inclination α of the increasing straight line portion 84 between the angle Z1 and the angle Z4, and on both sides across the angle Z4. When the slope of the graph 83 is different, there is a problem that accurate centering cannot be performed.
[0007]
The present invention has been made in view of such a conventional problem, and an object of the present invention is to provide a scroll compressor centering method and a centering device capable of performing more accurate centering in a short time. To do.
[0008]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, the scroll compressor centering method according to claim 1 of the present invention is a scroll compressor centering method comprising a fixed scroll and a orbiting scroll meshed with each other. The fixed scroll is urged toward the center of rotation, and the fixed scroll is rotated while maintaining the state where both scrolls are in contact with each other, and the urging of the fixed scroll with respect to the rotation angle of the fixed scroll The coordinate change in the direction is linearly approximated to an increasing linear portion and a decreasing linear portion, and the rotation angle indicated by the intersection of both linear portions is set as the optimum angle of the scrolls.
[0009]
That is, the coordinates of the fixed scroll with respect to the rotation angle of the fixed scroll are measured while the scrolls of the turning scroll and the fixed scroll are maintained in contact with each other. And the optimal angle of both scrolls is calculated | required from the intersection of the increase linear part and decrease linear part by which the change of the said coordinate with respect to the said rotation angle is linearly approximated.
[0010]
Further, in the scroll compressor centering method according to claim 2 of the present invention, the two scrolls are maintained at the optimum angle, the X-ray and the Y-line orthogonal to each other are virtually assumed, and the eccentric direction of the orbiting scroll by rotating the shaft. When the fixed scroll is moved forward along the X-ray, the position where both scrolls are in contact is set as the X direction offset position, and the eccentric direction of the orbiting scroll is adjusted by rotating the shaft, and the fixed scroll is The position where both scrolls contact when moved forward along the Y line is defined as the Y-direction offset position, and is measured in advance along the X line, or the gap dimension determined based on the machining tolerance, the X The position retreated from the direction offset position is calculated as the X center position, measured in advance along the Y line, or obtained based on the machining tolerance. Gap size fraction was, the retracted from the Y direction biased position position is calculated as the Y center position, the intersection between the Y center position and the X center position, and the optimum center position of the both scrolls.
[0011]
That is, the optimum center positions of the orbiting scroll and the fixed scroll are measured in advance from the X-direction offset position and the Y-direction offset position where both scrolls are in contact with each other. It is obtained from the intersection of the center position and the Y center position.
[0012]
In the centering device according to claim 3 of the present invention, in the centering device for centering the scroll compressor having the fixed scroll and the orbiting scroll engaged with each other, the fixing for fixing the position of the orbiting scroll is fixed. Means, urging means for urging the fixed scroll toward the center of rotation, rotating means for rotating the fixed scroll, angle detecting means for detecting the rotation angle of the fixed scroll, and the position of the fixed scroll. The position detection means to detect, the detection angle detected by the angle detection means, and the detection position detected by the position detection means are input, and the change of the detection position with respect to the detection angle is represented by an increasing straight line portion and a decreasing straight line. And the rotation angle indicated by the intersection of the two straight line portions is the optimum angle of the two scrolls. It includes a optimum angle calculation means for output, the.
[0013]
That is, when measuring the optimum angle of the fixed scroll with respect to the orbiting scroll, the orbiting scroll is fixed by the fixing means, and the fixed scroll is urged toward the rotation center by the urging means while being rotated by the rotating means. The rotation angle and position of the fixed scroll are detected by the angle detection means and the position detection means. Then, the optimum angle calculation means inputs the detection angle detected by the angle detection means and the detection position detected by the position detection means, and the change of the detection position with respect to the detection angle is increased and decreased. A straight line is approximated to the straight line portion, and the rotation angle indicated by the intersection of the two straight line portions is calculated as the optimum angle of the two scrolls.
[0014]
Furthermore, in the centering device according to claim 4 of the present invention, the maintaining means for maintaining the two scrolls at the optimum angle, the rotating means for adjusting the eccentric direction of the orbiting scroll, and the fixed scroll are arranged in the X direction orthogonal to each other. The X-direction moving means and the Y-direction moving means that move forward and backward along the Y direction, and the X-direction moving means advance the fixed scroll, and detect the position where the scrolls are in contact as the X-direction shift position. X-direction shift position detection means, Y-direction shift position detection means that moves the fixed scroll forward by the Y-direction movement means and detects the position where both scrolls are in contact as the Y-direction shift position, and the X direction A position that has been measured in advance along the gap or that has been retreated from the X-direction offset position by the gap dimension determined based on the machining tolerance is defined as the X center position. X center position calculating means for calculating the Y position, and a position that is measured in advance along the Y direction or that is retreated from the Y-direction offset position by the gap dimension obtained based on the machining tolerance is calculated as the Y center position. Optimum for calculating the intersection of the X center position calculated by the center position calculating means and the X center position calculating means and the Y center position calculated by the Y center position calculating means as the optimum center position of the scrolls. Center position calculating means.
[0015]
That is, the orbiting scroll and the fixed scroll are maintained at the optimum angle by the maintaining means. In this state, the fixed scroll is advanced by the X-direction moving means until the both scrolls come into contact with each other, and the position thereof is detected as the X-direction offset position by the X-direction offset position detection means. Further, the Y-direction moving means moves forward until the both scrolls come into contact with each other, and the position is detected as the Y-direction offset position by the Y-direction offset position detecting means. Next, the X center position calculation means calculates a position that is measured in advance along the X direction or that is retreated from the X direction offset position by the gap dimension obtained based on the machining tolerance as the X center position. At the same time, the Y center position calculation means calculates a position that is measured in advance along the Y direction or that is retreated from the Y-direction offset position by the gap dimension obtained based on the machining tolerance as the Y center position. The intersection between the X center position calculated by the X center position calculation means and the Y center position calculated by the Y center position calculation means by the optimum center position calculation means is the optimum center of both scrolls. Calculated as a position.
[0016]
Embodiment
Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view showing a scroll compressor 1 that is an object according to the present embodiment.
[0017]
The fixed scroll 2 constituting the lower part of the scroll compressor 1 is formed with an inflow port 3 through which fluid flows, and an outflow port 4 through which the fluid is compressed and discharged is formed at the center. Has been. A number of pairs of crescent-shaped compression chambers 5 are connected from the inlet 3 to the outlet 4 by the spiral blades 6 of the fixed scroll 2 and the spiral blades 8 of the orbiting scroll 7 which are substantially the same in shape and shifted by 180 °. Is formed between. As shown in the schematic diagram of FIG. 2, a spiral groove 5 is formed between the inflow port 3 and the outflow port 4. Between the groove portions 5 arranged in the radial direction, The thin-walled blade 6 is formed. On this fixed scroll 2, a turning scroll 7 is arranged, and on this turning scroll 7, a thin wall-like blade 8 projecting in a spiral shape and fitted into the groove portion 5 of the fixed scroll 2 is provided. Is formed. The orbiting scroll 7 is held by a bearing 9 fixed to the fixed scroll 2 and is connected to a shaft 10 supported by the bearing 9 via a slide bush 11. As the shaft 10 rotates, It is configured to turn on the fixed scroll 2.
[0018]
3 and 4 are diagrams showing the centering device 21 according to the present embodiment. FIG. 3 shows a front view and FIG. 4 shows a side view. An XY table 25 comprising a Y table 23 and an X table 24 is fixed to the apparatus main body 22 of the centering device 21, and the Y table 23 is connected to the rear Y 1 and the front Y 1 of the apparatus main body 22. That is, a Y-direction drive unit 26 that moves in the Y direction, a Y-direction position detector 27 that detects a movement position in the Y direction, and a Y-direction biasing device 28 that biases in the Y direction are provided. . The X table 24 is fixed in a state of being stacked on the Y table 23, and the X table 24 moves in the X direction on the right side X1 and the left side X2 of the apparatus body 22. A unit 29, an X-direction position detector 30 for detecting the movement position in the X direction, and an X-direction biasing device 31 for biasing in the X direction are provided.
[0019]
At the center of the XY table 25, a θ table 41 is fixed in a stacked state. The θ table 41 includes a table rotation unit 43 having a pulse motor 42 that rotates the θ table 41. The rotation angle of the θ table 41 is determined based on the number of drive pulses input to the pulse motor 42. It can be detected. Fixed scroll clamps 44 and 44 are provided on the θ table 41 so as to contact the outer periphery of the fixed scroll 2 of the scroll compressor 1 in a state where the scroll compressor 1 is placed. 44 and 44 are configured to be advanced and retracted by air cylinders 45 and 45. Thereby, the fixed scroll clamps 44, 44 are driven by the air cylinders 45, 45 so that the fixed scroll 2 can be fixed in a state of being sandwiched from both sides. The fixed scroll 2 fixed by the fixed scroll clamps 44, 44 is moved in the X direction and the Y direction by the X direction drive unit 28 and the Y direction drive unit 26 provided on the XY table 25. And is rotationally driven by the table rotation unit 43 provided on the θ table 41.
[0020]
Further, the apparatus main body 22 is provided with a base table 51, and the bearing 9 of the scroll compressor 1 placed on the θ table 41 is sandwiched from the outer periphery of the base table 51. Bearing clamps 52, 52 that are fixed in a state are provided. These bearing clamps 52, 52 are configured to be driven forward and backward by air cylinders 53, 53. Both of the bearing clamps 52, 52 are driven by the air cylinders 53, 53, and the bearing 9 is moved from both sides. In a sandwiched state, the bearing 9 and the orbiting scroll 7 held in the bearing can be fixed to the apparatus main body 22 via the base base 51. Further, a column 54 is erected on the apparatus main body 22, and the shaft 10 of the scroll compressor 1 placed on the θ table 41 is attached to the column 54. A rotating shaft rotating unit 55 is provided so as to be movable up and down.
[0021]
Then, air cylinders 45, 45 that drive the fixed scroll clamps 44, 44 forward and backward, air cylinders 53, 53 that drive the bearing clamps 52, 52 forward and backward, and a shaft rotation unit that rotates the shaft 10 of the scroll compressor 1. 55 is connected to a computer (not shown) so that the computer can fix and release the fixed scroll 2 and the bearing 9 of the scroll compressor 1 and control the rotation of the shaft. The X-direction drive unit 28 and the Y-direction drive unit 26 provided on the XY table 25 and the table rotation unit 43 provided on the θ table 41 are also connected to the computer. Thus, the fixed scroll 2 fixed to the θ table 41 can be controlled to move in the X direction and the Y direction, and can be controlled to rotate at a predetermined rotation angle. Furthermore, the Y-direction position detector 27 and the X-direction position detector 29 provided on the XY table 25, the Y-direction biasing device 28, and the X-direction biasing device 31 are also connected to the computer, The computer can urge the XY table 25 in the X direction and the Y direction, and the movement position in the X direction and the movement position in the Y direction of the fixed scroll 2 fixed on the XY table 25 can be determined. It is configured so that it can be measured.
[0022]
The specific operation of this embodiment according to the above configuration will be described with reference to the flowcharts shown in FIGS. It is assumed that the scroll compressor 1 is set in the centering device 21 in advance.
[0023]
That is, the computer connected to the centering device 21 reads the program stored in the storage medium, performs the process according to the procedure of the program, and when the subroutine for the centering process is called, first, the XY table 25, the X direction drive unit 28 is brought into a brake state in accordance with the center position, and the Y direction drive unit 29 is released to prevent the movement of the XY table 25 in the X direction. The XY table 25 is urged toward the rear Y1 of the apparatus main body 22 by the urging device 28 (S2). Then, the fixed scroll 2 fixed to the XY table 25 is urged toward the center of rotation, and the blade 6 formed on the fixed scroll 2 is interposed via the bearing 9 as shown in FIG. Are moved toward the rear Y1 until they are pressed against the blades 8 of the orbiting scroll 7 fixed. While maintaining this state, the θ table 41 is rotated by a predetermined pulse N1 to a limit position in the counterclockwise direction, for example.
[0024]
Next, while maintaining the state in which the blades 6 of the fixed scroll 2 are pressed against the blades 8 of the orbiting scroll 7, the θ table 41 is rotated by a predetermined pulse N2 in the reverse direction to the above, and the total drive is performed. The rotation angle of the θ table 41 based on the number of pulses and the escape amount, that is, the movement amount in the Y direction of the XY table 25 to which the θ table 41 is fixed are continuously measured (S6). Then, as shown in FIG. 7, the change of the movement amount with respect to the measured rotation angle is graphed, and approximated to two straight lines of an increasing straight line portion 71 and a decreasing straight line portion 72. An intersection 73 of the parts 71 and 72 is obtained (S7).
[0025]
At this time, it is determined whether or not there is a problem such that the two straight portions 71 and 72 cannot be linearly approximated, or the two linear portions 71 and 72 subjected to linear approximation do not intersect within a set range. If there is a problem (S8), an error is displayed (S9), the origin of the XY table 25 and the θ table 41 is returned (S10), and the process returns to the main routine. If not, the rotation angle indicated by the intersection 73 between the increasing linear portion 71 and the decreasing linear portion 72 is calculated and displayed as the optimum angle of the scrolls 2 and 7 (S11). Then, the urging device in the Y-direction urging device 28 is retracted, the urging of the XY table 25 to the rear Y1 is released (S12), and the θ table 41 is moved to the calculated rotation angle ( S13) The brakes of the X direction drive unit 28 and the Y direction drive unit 29 of the XY table 25 are released.
[0026]
As described above, in the centering device 21 according to the present embodiment, while maintaining the state in which the fixed scroll 2 is pressed against the orbiting scroll 7 fixed via the bearing 9, As shown in FIG. 2, while maintaining the state in which the blade 6 of the fixed scroll 2 is in contact with the blade 8 of the orbiting scroll 7, the biasing direction of the fixed scroll 2 with respect to the rotation angle of the fixed scroll 2 is maintained. Since the fixed scroll 2 is moved to a preset angle, the fixed scroll 2 is moved until it contacts the orbiting scroll 7, and in this state, The waiting time can be reduced as compared with the prior art in which the coordinates of the fixed scroll 2 had to be measured after waiting for a fixed time until the fixed scroll 2 is stabilized. Further, every time the fixed scroll 2 is moved to a preset angle, it is not necessary to move the fixed scroll 2 forward until the scrolls 2 and 7 come into contact with each other, or to move back to the original position. It can be shortened.
[0027]
The optimum angles of the scrolls 2 and 7 are obtained by the increasing linear portion 71 and the decreasing linear portion 72 obtained by linearly approximating the change in coordinates with respect to the continuously measured rotation angle, so that the fixed scroll at a preset angle is used. Compared with the conventional method in which the increase straight line portion 71 and the decrease straight line portion 72 are calculated based only on the position data 2 and the optimum angles of the scrolls 2 and 7 are obtained from these straight line portions 71 and 72, centering is achieved. Accuracy is improved. Furthermore, while the increasing linear portion 71 is calculated from the position data of the fixed scroll 2 at two different rotation angles, the inclination of the decreasing linear portion 72 is virtually set based on the inclination of the increasing linear portion 71. Even when the slopes of the straight portions 71 and 72 are different from those of the conventional art, the intersection 73 of the straight portions 71 and 72 and the optimum angle obtained based on the intersection 73 can be obtained accurately. .
[0028]
FIG. 6 is a flowchart subsequent to FIG. 5, and with the scrolls 2 and 7 maintained at the calculated optimum angle, the X-direction drive unit 28 of the XY table 25 is brought into a brake state in accordance with the center position. At the same time, after releasing the brake of the Y-direction drive unit 29 and preventing the movement of the XY table 25 in the X direction, the Y-direction biasing device 28 attaches the XY table 25 toward the rear Y1 of the apparatus main body 22. Then, the fixed scroll 2 fixed to the XY table 25 is urged toward the center of rotation (S22), and the blade 6 formed on the fixed scroll 2 is fixed via the bearing 9. Waiting for t1 seconds in a state of being in contact with the blade 8 of the orbiting scroll 7 (S23). Then, with the Y-direction biasing device 28 retracted and the biasing force to the rear Y1 is released (S24), the system waits for t2 seconds (S25), and the amount of movement in the Y1 direction, that is, the position in the Y-direction After the measurement value is detected from the detector 27 as the Y-direction offset position (S26), the brake state of the X-direction drive unit 28 is released.
[0029]
Next, the Y-direction drive unit 26 of the XY table 25 is brought into a brake state in accordance with the center position, and the brake of the X-direction drive unit 29 is released to prevent the movement of the XY table 25 in the Y direction. The X-direction biasing device 31 biases the XY table 25 toward the right side X1 of the apparatus main body 22, and the fixed scroll 2 fixed to the XY table 25 is biased toward the rotation center ( In S32, the blade 6 formed on the fixed scroll 2 is in contact with the blade 8 of the orbiting scroll 7 fixed via the bearing 9, and waits for t1 seconds (S33). Then, with the X-direction biasing device 31 retracted and the biasing force to the right X1 is released (S34), the system waits for t2 seconds (S35), and the amount of movement in the X1 direction, that is, the X direction The measurement value from the position detector 30 is detected as the X-direction offset position (S36). Then, the clearance is measured in advance along the X direction or obtained based on the machining tolerance, that is, the clearance between the blade 6 and the blade 8 in the X direction, and the position moves backward from the X-direction offset position. The calculated position is calculated as the X center position (S37), and is measured in advance along the Y direction or obtained based on a processing tolerance, that is, between the blade 6 and the blade 8 in the Y direction. The position retreated from the Y-direction offset position by the clearance is calculated as the Y center position (S38), and the intersection of the X center position and the Y center position is calculated as the optimum center position of the scrolls 2 and 7. Thereafter, the scrolls 2 and 7 are aligned with the optimum center position (S40), and the scrolls 2 and 7 are bolted (S41).
[0030]
In this way, the optimum center position of the orbiting scroll 7 and the fixed scroll 2 is measured in advance from the X-direction offset position and the Y-direction offset position where both the scrolls 2 and 7 are in contact, or based on processing tolerances. It can be determined from the intersections of the X center position and the Y center position that have been retracted by the determined gap size. Accordingly, the fixed scroll 2 is moved to the right X1 side and the left X2 side of the apparatus main body 22 to detect the position on the right X1 side and the position on the left X2 side where the scrolls 2 and 7 are in contact with each other. The process of calculating the midpoint between the two positions to obtain the X center position, and the fixed scroll 2 is moved to the rear Y1 side and the front Y2 side of the apparatus main body 22 so that the scrolls 2 and 7 are in contact with the rear Y1 side. And a position on the front Y2 side are calculated, a middle point between the two positions is calculated to obtain a Y center position, and the scrolls 2, 2 are calculated from the intersection of the X center position and the Y center position. Compared with the case where the optimal center position of 7 is obtained, the moving time of the fixed scroll 2, the standby time at the time of stopping, and the measuring time can be greatly shortened.
[0031]
【The invention's effect】
As described above, in the centering method of the scroll compressor according to claim 1 of the present invention, the scrolls of the orbiting scroll and the fixed scroll are maintained in contact with each other and the rotation angle of the fixed scroll is maintained. Since the coordinates of the fixed scroll can be continuously measured, each time the fixed scroll is moved to a preset angle, the fixed scroll is moved until it contacts the orbiting scroll, and in this state, the fixed scroll is stable. The waiting time can be reduced as compared with the conventional method that had to wait for a certain period of time. In addition, each time it moves to a preset angle, it is not necessary to move the fixed scroll forward until both scrolls come into contact with each other, or to move back to the original position, thereby shortening the measurement time. Can do.
[0032]
Since the optimum angle of both scrolls is obtained from an increasing straight line portion and a decreasing straight line portion obtained by linearly approximating the change in the movement amount with respect to the continuously measured rotation angle, only the fixed scroll position data at a preset angle is obtained. Thus, the increase straight line portion and the decrease straight line portion are calculated, and the centering accuracy is improved as compared with the conventional method in which the optimum angle of both scrolls is obtained from these straight line portions. Further, the increase linear portion is calculated from fixed scroll position data at two different rotation angles, while the inclination of the decrease linear portion is virtually set based on the inclination of the increase linear portion. Thus, even when the slopes of the two straight line portions are different, it is possible to accurately obtain the intersection between the two straight line portions and the optimum angle degree obtained based on the intersection.
[0033]
Further, in the centering method of claim 2, the optimum center position of the orbiting scroll and the fixed scroll is obtained based on the machining tolerance measured in advance from the X-direction offset position and the Y-direction offset position where both scrolls contact. It can be obtained from the intersection of the X center position and the Y center position which are respectively set back by the gap size. Therefore, the fixed scroll is moved in two directions on the one side and the other side in the X direction to detect the position on one side and the other side where both the scrolls are in contact, and calculate the intermediate point between the two positions. The process of obtaining the X center position, and the fixed scroll is moved in two directions, one side and the other side in the Y direction, to detect the position on one side where the scrolls are in contact with each other and the position on the other side. Compared with the case where the optimum center position of both scrolls is obtained from the intersection of the X center position and the Y center position by performing a process of calculating the point and obtaining the Y center position, the fixed scroll moving time and the stop time The waiting time and the measurement time can be greatly shortened.
[0034]
In the centering device according to claim 3 of the present invention, after the turning scroll is fixed by the fixing means, the fixed scroll is rotated by the rotating means while being urged toward the rotation center by the urging means. However, the rotation angle and position of the fixed scroll can be continuously detected by the angle detection means and the position detection means. For this reason, as in the case of claim 1, each time the fixed scroll is moved to a preset angle, the fixed scroll is moved until it comes into contact with the orbiting scroll, and in this state, the fixed scroll is constant until the fixed scroll is stabilized. The waiting time can be reduced as compared with the conventional case where the waiting time has been required. In addition, each time it moves to a preset angle, it is not necessary to move the fixed scroll forward until both scrolls come into contact with each other, or to move back to the original position, thereby shortening the measurement time. Can do.
[0035]
The optimum angle calculation means inputs the detection angle detected by the angle detection means and the detection position detected by the position detection means, and changes in the detection position with respect to the detection angle are increased linearly and decreased linearly. And the rotation angle indicated by the intersection of the two straight line portions is calculated as the optimum angle of the two scrolls. For this reason, as in the case of claim 1, the increase straight line portion and the decrease straight line portion are calculated only from the fixed scroll position data at a preset angle, and the optimum angle of both scrolls is obtained from these straight line portions. Compared to conventional devices, the centering accuracy is improved. Further, the increase linear portion is calculated from fixed scroll position data at two different rotation angles, while the inclination of the decrease linear portion is virtually set based on the inclination of the increase linear portion. Thus, even if the slopes of the two straight line portions are different, the intersection point between the two straight line portions and the optimum angle obtained based on the intersection point can be obtained accurately.
[0036]
Further, in the centering device of claim 4, as in the case of claim 2, the optimum center position of the orbiting scroll and the fixed scroll is determined from the X-direction and Y-direction offset positions where both scrolls are in contact with each other. It can be obtained from the intersection of the X center position and the Y center position that are measured in advance or retreated by the gap dimension determined based on the machining tolerance. Therefore, the fixed scroll is moved in two directions on the one side and the other side in the X direction to detect the position on one side and the other side where both the scrolls are in contact, and calculate the intermediate point between the two positions. The process of obtaining the X center position, and the fixed scroll is moved in two directions, one side and the other side in the Y direction, to detect the position on one side where the scrolls are in contact with each other and the position on the other side. Compared with the case where the optimum center position of both scrolls is obtained from the intersection of the X center position and the Y center position by performing a process of calculating the point and obtaining the Y center position, the fixed scroll moving time and the stop time The waiting time and the measurement time can be greatly shortened.
[0037]
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a scroll compressor according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view showing a main part of the scroll compressor in the same embodiment.
FIG. 3 is a front view showing the same embodiment;
FIG. 4 is a side view showing the same embodiment;
FIG. 5 is a flowchart showing the operation of the embodiment.
FIG. 6 is a flowchart following FIG. 5;
FIG. 7 is an explanatory diagram showing a measurement result of the same embodiment.
FIG. 8 is an explanatory diagram showing a conventional example.
FIG. 9 is an explanatory diagram showing measurement results of the conventional example.
[Explanation of symbols]
1 Scroll compressor
2 Fixed scroll
6 Fixed scroll blades
8 Orbiting scroll blade
9 Bearing
10 Shaft
11 Slide bush
21 Centering device
23 Y table
24 X table
25 XY table
27 Y direction position detector
28 Y direction biasing means
29 X direction drive unit
30 X direction position detector
31 X-direction position biasing device
41 θ table
43 Table rotation unit
44 Fixed scroll clamp
52 Bearing clamp
55 Shaft rotation unit
71 Increase straight line
72 Decreasing linear part
73 Intersection

Claims (4)

In the centering method of the scroll compressor comprising the fixed scroll and the orbiting scroll engaged with each other,
While fixing the orbiting scroll, urging the fixed scroll toward the center of rotation, maintaining the state where both scrolls are in contact with each other, rotating the fixed scroll, the fixed scroll relative to the rotation angle of the fixed scroll. The change in the amount of movement in the urging direction is linearly approximated to an increasing linear portion and a decreasing linear portion, and the rotation angle indicated by the intersection of both linear portions is the optimum angle of both scrolls. Scroll compressor centering method. While maintaining both the scrolls at the optimum angle, virtual X-rays and Y-lines orthogonal to each other, and by rotating the shaft, the fixed scroll is moved forward along the X-rays according to the eccentric direction of the orbiting scroll. When the two scrolls are in contact with each other in the X direction, the position where both scrolls are in contact with each other when the fixed scroll is moved forward along the Y line.
A gap dimension that is measured in advance along the X-ray or calculated based on a processing tolerance, a position that is retreated from the X-direction offset position is calculated as an X center position, and is measured in advance along the Y-line, Alternatively, a position retreated from the Y-direction offset position by the gap dimension obtained based on the machining tolerance is calculated as the Y center position, and the intersection of the X center position and the Y center position is determined as the optimum center of the two scrolls. The centering method of the scroll compressor according to claim 1, wherein the position is a position. In a centering device for centering a scroll compressor having a fixed scroll and a turning scroll meshed with each other,
Fixing means for fixing the position of the orbiting scroll;
Biasing means for biasing the fixed scroll toward the center of rotation;
Rotating means for rotating the fixed scroll;
Angle detecting means for detecting a rotation angle of the fixed scroll;
Position detecting means for detecting the position of the fixed scroll;
The detection angle detected by the angle detection means and the detection position detected by the position detection means are input, and the change of the detection position with respect to the detection angle is linearly approximated to an increasing linear portion and a decreasing linear portion. And an optimum angle calculation means for calculating the rotation angle indicated by the intersection of the two straight line portions as the optimum angle of the scrolls,
A centering device characterized by comprising: Maintaining means for maintaining the scrolls at the optimum angle;
A rotating means for adjusting the eccentric direction of the orbiting scroll by rotating the shaft;
An X direction moving means and a Y direction moving means for moving the fixed scroll forward and backward along the X direction and the Y direction orthogonal to each other;
X-direction shift position detection means for moving the fixed scroll forward by the X-direction movement means and detecting the position where both scrolls are in contact as the X-direction shift position;
Y-direction shift position detection means for moving the fixed scroll forward by the Y-direction movement means and detecting the position where both scrolls are in contact as the Y-direction shift position;
X center position calculation means for calculating, as an X center position, a position that is measured in advance along the X direction or that is a gap dimension obtained based on a processing tolerance, and a position retracted from the X direction offset position;
Y center position calculation means for calculating a position that is measured in advance along the Y direction or that is retreated from the Y-direction offset position by a gap dimension obtained based on a processing tolerance, as a Y center position;
Optimal center position calculating means for calculating the intersection of the X center position calculated by the X center position calculating means and the Y center position calculated by the Y center position calculating means as the optimum center position of the scrolls;
The centering device according to claim 3, further comprising:

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