Design method of a central guide pin, manufacturing method thereof, and assembly method of a rotating machine

Abstract

A design method for a central guide pin, a manufacturing method for a central guide pin, and an assembly method for a rotating machine. The design method for the central guide pin includes the steps of setting an imaginary central axis of a machine chamber, obtaining the central position of the central guide pin in the horizontal direction, obtaining the eccentricity of the central position of the central guide pin in the horizontal direction relative to the imaginary central axis of the machine chamber as a first eccentricity, setting an imaginary central axis of a partition plate, obtaining the central position of a groove portion in the horizontal direction, obtaining the eccentricity of the central position of the groove portion in the horizontal direction relative to the imaginary central axis of the partition plate as a second eccentricity, and designing the central guide pin based on the first eccentricity and the second eccentricity.

Description

Technical Field

[0001] The present invention relates to a design method of a center guide pin, a manufacturing method of the center guide pin, and an assembling method of a rotating machine.

[0002] This application claims priority from Japanese Patent Application No. 2021-100058 filed on June 16, 2021, the content of which is incorporated herein by reference. Background Art

[0003] In rotating machines such as steam turbines and compressors, there is a structure including a rotor that can rotate about an axis and has moving blades, a casing that covers the rotor, and a partition plate disposed between the casing and the rotor. The partition plate has a plurality of stationary blades (nozzles) arranged around the rotor on the upstream side of the moving blades. In such a rotating machine, it is necessary to position the partition plate in a horizontal direction intersecting the axis with respect to the casing that rotatably supports the rotor within a specified tolerance.

[0004] As a structure for positioning the partition plate with respect to the casing, for example, the structure of a steam turbine having a center guide pin is disclosed in Patent Document 1. The steam turbine of Patent Document 1 includes a rotor, a casing, a partition plate, and a center guide pin. In this structure, the casing extends in the circumferential direction of the rotor and is divided into upper and lower parts by a horizontal plane. The partition plate is disposed between the casing and the rotor and extends in the circumferential direction of the rotor and is divided into upper and lower parts by a horizontal plane. The center guide pin positions the partition plate in the horizontal direction perpendicular to the axis with respect to the casing. The center guide pin is inserted into groove portions formed on the outer peripheral surface of the partition plate. The groove portions are respectively disposed at positions vertically above and below the axis and extend in the axial direction.

[0005] Prior Art Documents

[0006] Patent Documents

[0007] Patent Document 1: Japanese Patent No. 6802351 Gazette

[0008] However, in the structure described in Patent Document 1, when assembling a rotating machine, it is necessary to temporarily assemble the partition plate relative to the machine chamber multiple times. Specifically, first, with the partition plate placed on the machine chamber, the gaps on both horizontal sides between the partition plate and the machine chamber are measured respectively. Then, the partition plate is removed from the machine chamber. Next, the eccentricity of the center guide pin relative to the groove portion is adjusted so that the gaps on both horizontal sides between the partition plate and the machine chamber are within the target range. The partition plate is reinstalled on the machine chamber in such a way that the center guide pin with the adjusted eccentricity is disposed inside the groove portion. Thus, in order to adjust the position of the partition plate relative to the machine chamber in the horizontal direction, it is necessary to move the partition plate, which is a heavy object, relative to the machine chamber multiple times. Therefore, there is a problem that it takes a very long time to install the partition plate and the machine chamber concentrically. Summary of the Invention

[0009] The present invention provides a design method for a center guide pin, a manufacturing method for a center guide pin, and an assembling method for a rotating machine, which can easily center the partition plate relative to the machine chamber and improve the efficiency of the operation.

[0010] The design method of the central guide pin of the present invention is a design method of the central guide pin of a rotating machine, and the rotating machine includes: a rotor that can rotate about an axis; a machine chamber that extends in the circumferential direction of the rotor and can be separated vertically at a machine chamber dividing surface that is a horizontal plane; a partition plate that is disposed between the machine chamber and the rotor, extends in the circumferential direction of the rotor, and can be separated vertically at a partition plate dividing surface that is a horizontal plane; a groove portion that is formed on the outer peripheral surface of the partition plate so as to extend in an axial direction along the axis; and a central guide pin that is fixed to the inner peripheral surface of the machine chamber facing the outer peripheral surface of the partition plate and can position the partition plate relative to the machine chamber in a horizontal direction orthogonal to the axial direction by being inserted into the groove portion. The design method of the central guide pin includes the following steps: at a plurality of measurement positions spaced apart along the axial direction, measure the inner peripheral surface of the machine chamber by three-dimensional measurement to obtain a plurality of center points of the machine chamber when viewed from the axial direction, and set an imaginary central axis of the machine chamber based on the plurality of center points of the machine chamber; measure the outer shape of the central guide pin by three-dimensional measurement to obtain the center position of the central guide pin in the horizontal direction; obtain an eccentricity of the center position of the central guide pin in the horizontal direction relative to the imaginary central axis of the machine chamber as a first eccentricity; measure the outer peripheral surface of the partition plate by three-dimensional measurement to obtain the center point of the partition plate when viewed from the axial direction, and set an imaginary central axis of the partition plate based on the center point of the partition plate; measure the shape of the groove portion by three-dimensional measurement to obtain the center position of the groove portion in the horizontal direction; obtain an eccentricity of the center position of the groove portion in the horizontal direction relative to the imaginary central axis of the partition plate as a second eccentricity; and design the central guide pin such that, in a state where the partition plate is assembled to the machine chamber, the position of the partition plate in the horizontal direction is within a specified tolerance relative to the machine chamber based on the first eccentricity and the second eccentricity.

[0011] The manufacturing method of the central guide pin of the present invention includes a step of manufacturing the central guide pin designed by the design method of the central guide pin as described above.

[0012] The assembly method of the rotating machine of the present invention includes the following steps: fixing the central guide pin manufactured by the manufacturing method of the central guide pin as described above to the inner peripheral surface of the machine chamber; and assembling the partition plate formed with the groove portion to the machine chamber and inserting the central guide pin into the groove portion.

[0013] Advantages of the Invention

[0014] According to the design method of the central guide pin, the manufacturing method of the central guide pin, and the assembly method of the rotating machine according to the present invention, it is possible to easily center the partition plate with respect to the machine chamber, thereby improving the efficiency of the operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 FIG. is a cross-sectional view showing a schematic structure of a steam turbine applying the design method of the central guide pin, the manufacturing method of the central guide pin, and the assembly method of the rotating machine according to an embodiment of the present invention.

[0016] Figure 2 is along Figure 1 sectional view taken along line II-II.

[0017] Figure 3 is Figure 2 an enlarged view of the central guide pin disposed between the upper half of the machine chamber and the upper half of the partition plate in.

[0018] Figure 4 is a top view of the central guide pin.

[0019] Figure 5 FIG. is a flowchart showing the steps of the design method of the central guide pin according to an embodiment of the present invention.

[0020] Figure 6 is a top view showing the measurement points of the three-dimensional measurement in the process of setting the reference plane of the machine chamber.

[0021] Figure 7 is along Figure 6 sectional view taken along line I-I.

[0022] Figure 8 is a top view showing the measurement points of the three-dimensional measurement in the process of setting the imaginary central axis of the machine chamber.

[0023] Figure 9 is a view of the measurement points of the three-dimensional measurement in the process of setting the imaginary central axis of the machine chamber as viewed from the axial direction.

[0024] Figure 10 is a view of the state in which the imaginary central axis of the machine chamber and the center position of the central guide pin are projected onto the reference plane of the machine chamber in the process of obtaining the first eccentricity as viewed from the axial direction.

[0025] Figure 11 is a view of the measurement points of the three-dimensional measurement in the process of setting the reference plane of the partition plate as viewed from the side of the reference plane of the partition plate.

[0026] Figure 12 is a view of the measurement points of the three-dimensional measurement in the process of setting the reference plane of the partition plate as viewed from the axial direction.

[0027] Figure 13It is a diagram of measurement points for three-dimensional measurement in the process of observing the imaginary central axis of the set partition plate axially.

[0028] Figure 14 It is a diagram of measurement points for three-dimensional measurement in the process of observing the imaginary central axis of the set partition plate from the radially outer side of the partition plate.

[0029] Figure 15 It is a diagram of measurement points for three-dimensional measurement in the process of observing the center position of the groove portion from the radially outer side of the partition plate.

[0030] Figure 16 It is a diagram of the state where the imaginary central axis of the partition plate and the center position of the groove portion are projected onto the partition plate reference plane in the process of obtaining the second eccentricity, observed axially.

[0031] Figure 17 It is a flowchart showing the steps of the manufacturing method of the center guide pin according to the embodiment of the present invention.

[0032] Figure 18 It is a flowchart showing the steps of the assembly method of the rotating machine according to the embodiment of the present invention.

[0033] Explanation of reference numerals:

[0034] 1... Steam turbine (rotating machine);

[0035] 2... Rotor;

[0036] 3... Partition plate;

[0037] 4... Casing;

[0038] 5... Vertical position defining portion;

[0039] 7... Center guide pin;

[0040] 21... Rotor shaft;

[0041] 22... Moving blade;

[0042] 30... Stationary blade;

[0043] 31... Upper half partition plate (partition plate);

[0044] 31X, 32X... Partition plate split surface;

[0045] 31a... Outer peripheral surface;

[0046] 31b... Insertion recess;

[0047] 32... Lower half partition plate (partition plate);

[0048] 41... Upper machine chamber (machine chamber);

[0049] 41X, 42X... Machine chamber dividing surface;

[0050] 41a... Inner circumferential surface;

[0051] 41b... Mounting recess;

[0052] 42... Lower machine chamber (machine chamber);

[0053] 51... Restricting piece;

[0054] 52... Bolt;

[0055] 71... Pin base portion;

[0056] 72... Positioning portion;

[0057] 74... Positioning surface;

[0058] 73... Fastening member;

[0059] 73a... External thread portion;

[0060] 90A, 90B... Sealing member;

[0061] 91A, 91B... Sealing fixing surface;

[0062] 312... Groove portion;

[0063] 312a... Inner side surface;

[0064] 312b... Bottom surface;

[0065] 412... Pin mounting portion;

[0066] 412a... Recess;

[0067] 412b... Internal thread portion;

[0068] 412c... Hole;

[0069] Ar... Axis;

[0070] Da... Axial direction;

[0071] Dc... Circumferential direction;

[0072] Dh... Horizontal direction;

[0073] Dr... Radial direction;

[0074] Dv... Vertical direction;

[0075] F... Flange portion;

[0076] G1, G2... central positions;

[0077] H1... first eccentricity;

[0078] H2... second eccentricity;

[0079] J1, J2, J11, J12... center points;

[0080] K1, K2... imaginary central axes;

[0081] O1... pin shaft;

[0082] P1... reference plane of the machine chamber;

[0083] P2... reference plane of the partition board;

[0084] Sh... horizontal plane;

[0085] Sv... plumb line;

[0086] S100... design method of the central guide pin;

[0087] S110... process of setting the reference plane of the machine chamber;

[0088] S120... process of setting the imaginary central axis of the machine chamber;

[0089] S130... process of obtaining the central position of the central guide pin;

[0090] S140... process of obtaining the first eccentricity;

[0091] S150... process of setting the reference plane of the partition board;

[0092] S160... process of setting the imaginary central axis of the partition board;

[0093] S170... process of obtaining the central position of the groove part;

[0094] S180... process of obtaining the second eccentricity;

[0095] S190... process of designing the central guide pin;

[0096] S200... manufacturing method of the central guide pin;

[0097] S210... process of manufacturing the central guide pin;

[0098] S300... assembly method of the rotating machinery;

[0099] S310...Process of fixing the center guide pin to the machine chamber;

[0100] S320...Process of assembling the partition plate to the machine chamber. Detailed implementation mode

[0101] Hereinafter, with reference to the drawings, a method for designing the center guide pin for implementing the present invention, a method for manufacturing the center guide pin, and a method for manufacturing a rotating machine will be described. However, the present invention is not limited to this embodiment.

[0102] (Structure of steam turbine (rotating machine))

[0103] As Figure 1 and Figure 2 shown, the steam turbine 1 of the rotating machine in this embodiment includes a rotor 2, a machine chamber 4, a partition plate 3, a vertical position defining portion 5 (refer to Figure 2 ), and a center guide pin 7 (refer to Figure 2 ).

[0104] The rotor 2 can rotate about the axis Ar. In the following description, the direction in which the axis Ar extends is defined as the axial direction Da. The radial direction of the rotor 2 (steam turbine 1) centered on the axis Ar is simply referred to as the radial direction Dr. One of the radial directions Dr perpendicular to the axis Ar is defined as the vertical direction Dv. The direction in the radial direction Dr perpendicular to the vertical direction Dv and orthogonal to the axis Ar is defined as the horizontal direction Dh. The direction around the rotor 2 centered on the axis Ar is defined as the circumferential direction Dc of the rotor 2 (steam turbine 1).

[0105] The rotor 2 includes a rotor shaft 21 and multiple stages of moving blades 22. The rotor shaft 21 is formed in a cylindrical shape centered on the axis Ar and extends along the axial direction Da. The multiple stages of moving blades 22 are arranged at intervals along the axial direction Da. Each stage of moving blade 22 extends from the rotor shaft 21 toward the outside in the radial direction Dr. Each stage of moving blade 22 is fixed to the outer peripheral surface of the rotor shaft 21. Multiple pieces of each stage of moving blade 22 are arranged in a row in the circumferential direction Dc centered on the axis Ar.

[0106] The machine chamber 4 is formed to cover the rotor 2 from the outside in the radial direction Dr. More specifically, the machine chamber 4 is formed in a cylindrical shape extending along the circumferential direction Dc centered on the axis Ar. As Figure 2 shown, the machine chamber 4 is vertically divided into upper and lower halves by a horizontal plane Sh that is perpendicular to the vertical direction Dv and includes the axis Ar. The machine chamber 4 includes an upper half machine chamber (machine chamber) 41 disposed above the vertical direction Dv with respect to the axis Ar, and a lower half machine chamber (machine chamber) 42 disposed below the vertical direction Dv.

[0107] The upper machine chamber 41 has chamber dividing surfaces 41X at both ends in the circumferential direction Dc, which are horizontal planes Sh extending in the horizontal direction Dh. Similarly, the lower machine chamber 42 has chamber dividing surfaces 42X at both ends in the circumferential direction Dc, which are horizontal planes Sh extending in the horizontal direction Dh. The upper machine chamber 41 and the lower machine chamber 42 each have a flange portion F that protrudes in such a way as to extend the chamber dividing surfaces 41X and 42X outward in the horizontal direction Dh. The flange portion F of the upper machine chamber 41 and the flange portion F of the lower machine chamber 42 are fixed by fastening members (not shown) such as bolts and nuts in a state where the chamber dividing surface 41X of the upper machine chamber 41 and the chamber dividing surface 42X of the lower machine chamber 42 are in contact with each other.

[0108] The partition plate 3 is disposed between the machine chamber 4 and the rotor 2. A plurality of partition plates 3 are arranged at intervals along the axial direction Da. Each partition plate 3 is formed to extend in the circumferential direction Dc. Each partition plate 3 is formed to cover the ring-shaped portion of the rotor 2 centered on the axis Ar from the outside in the radial direction Dr. The partition plate 3 is disposed separately on one side (upstream side) in the axial direction Da with respect to each stage of moving blades 22. The partition plate 3 has a plurality of stationary blades (nozzles) 30 for rectifying the steam supplied to the moving blades 22 (not shown in Figure 2 ). These stationary blades 30 are arranged in the circumferential direction Dc centered on the axis Ar.

[0109] The partition plate 3 is divided into upper and lower parts by the horizontal plane Sh. The partition plate 3 has two half partition plates, namely, an upper half partition plate 31 disposed above the axis Ar in the vertical direction Dv and a lower half partition plate 32 disposed below the axis Ar in the vertical direction Dv. The upper half partition plate 31 has partition plate dividing surfaces 31X at both ends in its circumferential direction Dc, which are the horizontal plane Sh. The upper half partition plate 31 can be accommodated inside the upper machine chamber 41. Similarly, the lower half partition plate 32 has partition plate dividing surfaces 32X at both ends in its circumferential direction Dc, which are the horizontal plane Sh. The lower half partition plate 32 can be accommodated inside the lower machine chamber 42.

[0110] As Figure 1 shown, in order to seal between the inner peripheral surface of the machine chamber 4 and the outer peripheral surface of the rotor 2, the steam turbine 1 has sealing members 90A and 90B at both ends in the axial direction Da. The sealing members 90A and 90B are disposed outside the partition plate 3 and the moving blades 22 in the axial direction Da. The sealing members 90A and 90B are respectively fixed to sealing fixing surfaces 91A and 91B formed on the inner peripheral surface of the machine chamber 4.

[0111] In addition, as Figure 2As shown, a groove portion 312 extending in the axial direction Da is formed on the outer peripheral surface of the partition plate 3. The groove portions 312 are respectively formed on the upper half partition plate 31 and the lower half partition plate 32. The groove portion 312 is formed at the uppermost part (the upper top) in the vertical direction Dv on the outer peripheral surface 31a of the upper half partition plate 31. In addition, the groove portion 312 is formed at the lowermost part (the lower top) in the vertical direction Dv on the outer peripheral surface of the lower half partition plate 32. The groove portions 312 are formed in the same shape for the upper half partition plate 31 and the lower half partition plate 32. Therefore, in the present embodiment, the groove portion 312 formed on the upper half partition plate 31 will be described as an example.

[0112] As Figure 3 shown, the groove portion 312 is recessed in a U-shaped cross-section from the outer peripheral surface 31a of the upper half partition plate 31. The groove portion 312 extends in the axial direction Da. That is, the groove portion 312 is formed so as to penetrate both surfaces of the upper half partition plate 31 in the axial direction Da. The groove portion 312 of the present embodiment includes two inner side surfaces 312a and a bottom surface 312b. The two inner side surfaces 312a are planes that extend in the vertical direction Dv and the axial direction Da and are opposed to each other in the horizontal direction Dh. The bottom surface 312b is a plane that connects the two inner side surfaces 312a on the inner side in the radial direction Dr and extends in the horizontal direction Dh and the axial direction Da.

[0113] On the inner peripheral surface 41a of the upper half machine chamber 41 and the inner peripheral surface of the lower half machine chamber 42 opposed to the groove portion 312, a pin mounting portion 412 capable of mounting the center guide pin 7 is formed. The pin mounting portion 412 includes a recess 412a and an internal thread portion 412b. The recess 412a can be inserted with a pin base portion 71 of the center guide pin 7 described later. The internal thread portion 412b is screwed with an external thread portion 73a of a fastening member 73 that fixes the center guide pin 7 to the upper half machine chamber 41 and the lower half machine chamber 42.

[0114] As Figure 2 shown, the vertical position regulating portion 5 positions the upper half partition plate 31 in the vertical direction Dv with respect to the upper half machine chamber 41. The vertical position regulating portion 5 is disposed near the chamber dividing surface 41X at both ends in the circumferential direction Dc in the upper half machine chamber 41. The vertical position regulating portion 5 regulates the relative positions of both ends of the upper half machine chamber 41 in the circumferential direction Dc and both ends of the upper half partition plate 31 in the circumferential direction Dc.

[0115] The plumb position defining portion 5 includes a restricting piece 51 and a bolt 52. An installation recess 41b for installing the plumb position defining portion 5 is formed in the upper half machine chamber 41, and an insertion recess 31b into which the end portion of the restricting piece 51 is inserted is formed in the upper half partition plate 31. The restricting piece 51 can be fixed in the installation recess 41b by the bolt 52. The end portion of the restricting piece 51 projects from the installation recess 41b toward the upper half partition plate 31. The end portion of the restricting piece 51 is inserted into the insertion recess 31b. The insertion recess 31b restricts the movement of the inserted end portion of the restricting piece 51 in the plumb direction Dv.

[0116] The center guide pin 7 is a member for positioning the partition plate 3 relative to the machine chamber 4 in the horizontal direction Dh orthogonal to the axial direction Da and the plumb direction Dv. The center guide pin 7 is fixed to the inner peripheral surface of the machine chamber 4 opposed to the outer peripheral surface of the partition plate 3. The center guide pin 7 can be fitted into the groove portion 312. More specifically, the center guide pin 7 can position the upper half partition plate 31 and the lower half partition plate 32, i.e., the half partition plates (semicircular partition plates), relative to the upper half machine chamber 41 and the lower half machine chamber 42, i.e., the half machine chambers (semicylindrical machine chambers), in the horizontal direction Dh. The center guide pin 7 is disposed between the upper half partition plate 31 and the upper half machine chamber 41 in the upper part in the plumb direction Dv, and is disposed between the lower half partition plate 32 and the lower half machine chamber 42 in the lower part in the plumb direction Dv. In other words, when viewed from the axial direction Da, the center guide pin 7 is respectively disposed on the plumb lines Sv (refer to Figure 2 ) passing through the axis Ar. It should be noted that the structure of the center guide pin 7 disposed between the upper half machine chamber 41 and the upper half partition plate 31 is the same as the structure of the center guide pin 7 disposed between the lower half machine chamber 42 and the lower half partition plate 32. Therefore, in the present embodiment, the center guide pin 7 disposed between the upper half machine chamber 41 and the upper half partition plate 31 is taken as an example for description.

[0117] As Figure 3 shown, the center guide pin 7 is fixed to the inner peripheral surface 41a of the upper half machine chamber 41 opposed to the outer peripheral surface 31a of the upper half partition plate 31. The center guide pin 7 is installed in the pin installation portion 412. The center guide pin 7 of the present embodiment includes a pin base portion 71 and a positioning portion 72. The pin base portion 71 is housed in the recess 412a of the pin installation portion 412. The pin base portion 71 is formed in a disk shape centered on the pin axis O1. Here, the pin axis O1 is an axis extending in the plumb direction Dv. The pin axis O1 coincides with the central axis of the hole 412c through which the fastening member 73 for installing the center guide pin 7 to the upper half machine chamber 41 passes. The recess 412a of the pin installation portion 412 forms a disk-shaped space slightly larger than the pin base portion 71. As a result, by housing the pin base portion 71 in the recess 412a, the position of the center guide pin 7 relative to the upper half machine chamber 41 is defined.

[0118] The positioning portion 72 is disposed inside the groove portion 312 of the upper half machine chamber 41 in a state where the pin base portion 71 is received in the recess portion 412a and the center guide pin 7 is fixed to the upper half machine chamber 41. As Figure 3 and Figure 4 shown, the positioning portion 72 has a pair of positioning surfaces 74 on both sides in the horizontal direction Dh in a state where the center guide pin 7 is fixed to the upper half machine chamber 41. The pair of positioning surfaces 74 extend in the axial direction Da and the vertical direction Dv in a manner orthogonal to the horizontal direction Dh parallel to each other. The interval in the horizontal direction Dh between the pair of positioning surfaces 74 is formed to be slightly smaller than the width of the groove portion 312 described above. Thus, the positioning portion 72 is fitted into the groove portion 312. At this time, the pair of positioning surfaces 74 are respectively and simultaneously in contact with the two inner side surfaces 312a of the groove portion 312. It should be noted that when the positioning portion 72 is fitted into the groove portion 312, there may be a slight gap due to the machining tolerances of the groove width of the groove portion 312 and the positioning surfaces of the positioning portion 72. Even in such a case, the gap is an allowable size that does not affect the eccentricity between the machine chamber and the partition plate. As a result, the movement of the upper half partition plate 31 having the groove portion 312 relative to the upper half machine chamber 41 in the horizontal direction Dh is restricted. That is, the upper half partition plate 31 is positioned in the horizontal direction Dh relative to the upper half machine chamber 41 through the center guide pin 7. In addition, in this state, the upper half partition plate 31 having the groove portion 312 is also allowed to move relative to the upper half machine chamber 41 along the axial direction Da in which the pair of positioning surfaces 74 extend.

[0119] As Figure 3 shown, the center guide pin 7 adjusts the position of the upper half partition plate 31 (partition plate 3) relative to the upper half machine chamber 41 (machine chamber 4) in the horizontal direction Dh by eccentrically disposing the center position of the positioning portion 72 in the horizontal direction Dh (hereinafter, referred to as the center position G1 of the center guide pin 7) relative to the pin shaft O1 in the horizontal direction Dh. In the present embodiment, the center position of the positioning portion 72 in the horizontal direction Dh is a position where the distances from the pair of positioning surfaces 74 are equal in the horizontal direction Dh.

[0120] Next, a design method S100 of the center guide pin and a manufacturing method S200 of the center guide pin will be described. It should be noted that in the following description, the structure of the center guide pin 7 disposed between the upper half machine chamber 41 and the upper half partition plate 31 is the same as the structure of the center guide pin 7 disposed between the lower half machine chamber 42 and the lower half partition plate 32. Therefore, the design method and the manufacturing method of the center guide pin 7 disposed between the upper half machine chamber 41 and the upper half partition plate 31 will be described as an example.

[0121] (Design method of the center guide pin)

[0122] The design method S100 of the center guide pin is based on designing the shape of the center guide pin 7 by using the results of three-dimensional measurement with a three-dimensional measuring instrument. In the three-dimensional measurement of the present embodiment, for example, multiple points on the surface of the component are measured to obtain a hypothetical central axis, a reference plane, etc. As Figure 5 shown, the design method S100 of the center guide pin includes: a process S110 of setting the machine chamber reference plane, a process S120 of setting the hypothetical central axis of the machine chamber, a process S130 of obtaining the central position of the center guide pin, a process S140 of obtaining the first eccentricity, a process S150 of setting the partition plate reference plane, a process S160 of setting the hypothetical central axis of the partition plate, a process S170 of obtaining the central position of the groove portion, a process S180 of obtaining the second eccentricity, and a process S190 of designing the center guide pin.

[0123] In the process S110 of setting the machine chamber reference plane, the machine chamber dividing surface 41X of the upper machine chamber 41 is measured by three-dimensional measurement. Specifically, as Figure 6 and Figure 7 shown, on the machine chamber dividing surface 41X, the positions of measurement points at three or more points in total at multiple portions separated in the axial direction Da are measured by three-dimensional measurement. It should be noted that the measurement positions described later refer to the positions of the measurement points measured by three-dimensional measurement. In the present embodiment, on the machine chamber dividing surface 41X, measurements are performed at two portions separated in the axial direction Da. Specifically, the positions of two points, i.e., measurement points m11 and m12, on both sides of the horizontal direction Dh across the seal fixing surface 91A, and two points on both sides of the horizontal direction Dh across the seal fixing surface 91B and measurement points m13 and m14, are used to measure the machine chamber dividing surface 41X by three-dimensional measurement. Here, the two measurement points m11 and m12 preferably have substantially the same position in the axial direction Da on the machine chamber dividing surface 41X. Similarly, the two measurement points m13 and m14 preferably have substantially the same position in the axial direction Da on the machine chamber dividing surface 41X. Based on the four measured measurement points m11 to m14, a machine chamber reference plane P1, which is a hypothetical plane on the machine chamber dividing surface 41X, is set as a hypothetical plane including the measurement points m11 to m14. That is, a machine chamber reference plane P1 parallel to the machine chamber dividing surface 41X is set.

[0124] It should be noted that here, position measurements are performed at the four points m11 to m14, but as long as the measurement results of the machine chamber dividing surface 41X at at least three or more measurement points are obtained in a manner that can define the hypothetical plane. In addition, the machine chamber reference plane P1 can also be set with higher accuracy by further increasing the number of measurement points. When increasing the number of measurement points, the number of measurement portions (machine chamber dividing surface 41X) with different positions in the axial direction Da can be increased to three or more, or the number of measurement points at portions (machine chamber dividing surface 41X) with the same position in the axial direction Da can be increased to three or more.

[0125] In the process S120 of setting the imaginary central axis of the upper machine chamber, as Figure 8 and Figure 9 shown, at a plurality of measurement positions spaced apart along the axial direction Da, the inner peripheral surface 41a of the upper machine chamber 41 is measured by three-dimensional measurement. As Figure 3 shown, the inner peripheral surface 41a of the upper machine chamber 41 is a surface that faces the outer peripheral surface 31a of the upper partition plate 31 when the upper partition plate 31 is inserted into the upper machine chamber 421. As Figure 8 and Figure 9 shown, in the present embodiment, three-dimensional measurements are respectively performed at two sealing and fixing surfaces 91A and 91B that are spaced apart along the axial direction Da and are the inner peripheral surface 41a of the upper machine chamber 41. At the sealing and fixing surface 91A, measurements are performed at three or more measurement points m21 to m23 spaced apart along the circumferential direction Dc, and thereby the center of the imaginary circle passing through the measurement points m21 to m23 is obtained. The center of the imaginary circle passing through the measurement points m21 to m23 is obtained as the center point J1 of the sealing and fixing surface 91A, which is one of the center points of the upper machine chamber 41 when viewed from the axial direction Da. In addition, at the sealing and fixing surface 91B, measurements are performed at three or more measurement points m24 to m26 spaced apart along the circumferential direction Dc, and thereby the center of the imaginary circle passing through the measurement points m24 to m26 is obtained. The center of the imaginary circle passing through the measurement points m24 to m26 is obtained as the center point J2 of the sealing and fixing surface 91B, which is one of the center points of the upper machine chamber 41 when viewed from the axial direction Da. Here, it is preferable that the three measurement points m21 to m23 are on the inner peripheral surface 41a of the upper machine chamber 41 and the positions in the axial direction Da are substantially the same positions. That is, the three measurement points m21 to m23 are located on the same imaginary plane orthogonal to the axis Ar. Similarly, it is preferable that the three measurement points m24 to m26 are on the inner peripheral surface 41a of the upper machine chamber 41 and the positions in the axial direction Da are substantially the same positions. Based on the obtained plurality of center points J1 and J2, the imaginary central axis K1 of the upper machine chamber 41 is set. Specifically, the imaginary line passing through the center points J1 and J2 is defined as the imaginary central axis K1 of the upper machine chamber 41.

[0126] It should be noted that here, position measurements are performed at the measurement points m21 to m26, but the number of measurement points can also be further increased to obtain the positions of the center points J1 and J2 with higher accuracy. When increasing the number of measurement points, the number of measurement points at the part (the inner peripheral surface 41a of the upper machine chamber 41) where the positions in the axial direction Da are the same can be increased to three or more. In addition, in order to increase the number of center points, the number of measurement parts (the inner peripheral surface 41a of the upper machine chamber 41) with different positions in the axial direction Da can also be increased to three or more. In addition, when the number of center points is three or more, the imaginary central axis K1 is defined as the imaginary line passing through all the center points.

[0127] In the process S130 of obtaining the central position of the central guide pin, the outer shape of the central guide pin 7 is measured by three-dimensional measurement. For the plurality of central guide pins 7 respectively arranged corresponding to the plurality of upper half partition plates 31, three-dimensional measurement is respectively performed. Specifically, as Figure 4 shown, the positions of a pair of positioning surfaces 74 of the positioning portion 72 are measured. In the present embodiment, at the intermediate position of the positioning portion 72 in the axial direction Da, the positions of the measurement points m31 and m32 of the pair of positioning surfaces 74 are measured. Based on the measured positions of the measurement points m31 and m32, the intermediate position of the measurement points m31 and m32 in the horizontal direction Dh is calculated. By calculating the intermediate position of the measurement points m31 and m32 in the horizontal direction Dh, the intermediate position is obtained as the central position G1 of the central guide pin 7 in the horizontal direction Dh.

[0128] It should be noted that in the present embodiment, the positions of the measurement points m31 and m32 at the intermediate position of the positioning portion 72 in the axial direction Da are measured, but the positions can also be measured by a plurality of measurement points separated in the axial direction Da, so as to set the central position G1 with higher precision.

[0129] In the process S140 of obtaining the first eccentricity, as Figure 10 shown, the eccentricity of the central position G1 of the central guide pin 7 in the horizontal direction Dh with respect to the imaginary central axis K1 of the upper half machine chamber 41 is obtained as the first eccentricity H1. Specifically, in the process S140 of obtaining the first eccentricity, the imaginary central axis K1 of the upper half machine chamber 41 and the central position G1 of the central guide pin 7 are respectively projected onto the machine chamber reference plane P1. Then, the offset amount between the imaginary central axis K1 of the upper half machine chamber 41 and the central position G1 of the central guide pin 7 in the horizontal direction Dh on the machine chamber reference plane P1 is obtained. This offset amount is obtained as the first eccentricity H1.

[0130] In the process S150 of setting the partition plate reference plane, the partition plate dividing surface 31X of the upper half partition plate 31 is measured by three-dimensional measurement. Three-dimensional measurement of the partition plate dividing surface 31X is respectively performed for each of the plurality of upper half partition plates 31. Specifically, as Figure 11 and Figure 12As shown, the positions of more than three measurement points are measured by three-dimensional measurement at a plurality of portions separated along the axial direction Da and the horizontal direction Dh on the partition surface 31X of the partition plate. In the present embodiment, position measurement is performed at four points, i.e., measurement points m41 to m44, on the partition surface 31X of the partition plate. The measurement points m41 and m42 are two points that are substantially the same in the axial position Da and separated in the horizontal direction Dh. The measurement points m43 and m44 are two points that are separated in the horizontal direction Dh and separated from the measurement points m41 and m42 in the axial direction Da. Preferably, the measurement points m43 and m44 are positions that are as far away as possible from the measurement points m41 and m42 in the axial direction Da. The positions of the measurement points m43 and m44 in the axial direction Da are substantially the same. Based on the four measured measurement points m41 to m44, a hypothetical plane on the partition surface 31X, i.e., the partition reference plane P2, is set as a hypothetical plane including the measurement points m41 to m44. That is, the partition reference plane P2 parallel to the partition surface 31X is set.

[0131] It should be noted that here, one measurement is performed at the measurement points m41 to m44, but the partition reference plane P2 can also be set with higher accuracy by further increasing the number of measurement points. When increasing the number of measurement points, the measured portions (the partition surface 31X of one upper half partition plate 31) with different axial positions Da can be increased to three or more, or the measurement points at the portions with the same axial position Da can be increased to three or more. In addition, although the four points of the measurement points m41 to m44 are measured, the partition reference plane P2 can also be set by measuring three points.

[0132] In the process S160 of setting the hypothetical central axis of the partition plate, as Figure 13 and Figure 14As shown, the outer peripheral surface 31a of each upper half partition plate 31 is measured by three-dimensional measurement. The three-dimensional measurement of the outer peripheral surface 31a of the upper half partition plate 31 is performed for each of a plurality of upper half partition plates 31. Specifically, at a plurality of measurement positions different in the axial direction Da (a plurality of measurement positions spaced apart in the axial direction Da), the outer peripheral surface 31a of one upper half partition plate 31 is measured by three-dimensional measurement. In the present embodiment, first, measurements of three or more measurement points m51 to m53 that are the same in the axial direction Da and spaced apart in the circumferential direction Dc are performed, and the center of the imaginary circle passing through the measurement points m51 to m53 is obtained. The center of the imaginary circle passing through the measurement points m51 to m53 is obtained as the center point J11 of the upper half partition plate 31 when viewed from the axial direction Da. Then, at a position separated from the measurement points m51 to m53 in the axial direction Da, measurements of three or more measurement points m54 to m56 that are the same in the axial direction Da and spaced apart in the circumferential direction Dc are performed. Thereby, the center of the imaginary circle passing through the measurement points m54 to m56 is obtained. The center of the imaginary circle passing through the measurement points m54 to m56 is obtained as the center point J12 of the upper half partition plate 31 when viewed from the axial direction Da. Based on the obtained plurality of center points J11 and J12, the imaginary central axis K2 of the upper half partition plate 31 is set. Specifically, the imaginary line passing through all the center points J11 and J12 is defined as the imaginary central axis K2 of the upper half partition plate 31. It should be noted that when it is determined that the eccentricity between the outer peripheral surface 31a of the upper half partition plate 31 and the inner peripheral surface of the upper half partition plate 31 is small, the measurement may be performed not on the outer peripheral surface 31a of the upper half partition plate 31 but on the inner peripheral surface of the upper half partition plate 31.

[0133] In the process S170 of obtaining the center position of the groove portion, the shape of the groove portion 312 is measured by three-dimensional measurement. The three-dimensional measurement of the shape of the groove portion 312 is performed for each of a plurality of upper half partition plates 31. Specifically, as Figure 15 shown, the positions of the pair of two inner side surfaces 312a of the groove portion 312 are measured. In the present embodiment, at the intermediate position of the groove portion 312 in the axial direction Da, the positions of the measurement points m61 and m62 of the two inner side surfaces 312a are measured. Based on the measured positions of the measurement points m61 and m62, the intermediate position of the measurement points m61 and m62 in the horizontal direction Dh is calculated. By calculating the intermediate position of the measurement points m61 and m62 in the horizontal direction Dh, the intermediate position is obtained as the center position G2 of the groove portion 312 in the horizontal direction Dh.

[0134] It should be noted that here, the position measurements of the measurement points m61 and m62 at the intermediate position of the groove portion 312 in the axial direction Da are performed, but the position measurements may also be performed by a plurality of measurement points separated in the axial direction Da, so as to set the center position G2 with higher accuracy.

[0135] In the process S180 of obtaining the second eccentricity, as Figure 16 shown, the eccentricity of the center position G2 of the groove portion 312 in the horizontal direction Dh with respect to the imaginary center axis K2 of the upper half partition plate 31 is obtained as the second eccentricity H2. Specifically, in the process S180 of obtaining the second eccentricity, the imaginary center axis K2 of the upper half partition plate 31 and the center position G2 of the groove portion 312 are respectively projected onto the partition plate reference plane P2. Then, the offset amount between the imaginary center axis K2 of the upper half partition plate 31 and the center position G2 of the groove portion 312 in the horizontal direction Dh on the partition plate reference plane P2 is obtained. This offset amount is obtained as the second eccentricity H2.

[0136] In the process S190 of designing the center guide pin, based on the obtained first eccentricity H1 and second eccentricity H2, the center guide pin 7 is designed such that the position of the upper half partition plate 31 in the horizontal direction Dh in the state where the upper half partition plate 31 is assembled to the upper half machine chamber 41 is within a specified tolerance with respect to the upper half machine chamber 41. In this case, if the position of the upper half partition plate 31 in the horizontal direction Dh in the state where the upper half partition plate 31 is assembled to the upper half machine chamber 41 is within the specified tolerance with respect to the upper half machine chamber 41, there is no need to redesign the center guide pin 7, and the center guide pin 7 installed in the upper half machine chamber 41 can be directly used at this time point. In the case where the position of the upper half partition plate 31 in the horizontal direction Dh in the state where the upper half partition plate 31 is assembled to the upper half machine chamber 41 is outside the specified tolerance with respect to the upper half machine chamber 41, the amount by which the center position G1 of the pair of positioning surfaces 74 of the center guide pin 7 is eccentric in the horizontal direction Dh with respect to the pin shaft O1 is determined. Specifically, the amount by which the shape of the positioning portion 72 changes by cutting and surfacing one of the pair of positioning surfaces 74 is determined. It should be noted that the center guide pin 7 can also be remanufactured.

[0137] (Manufacturing method of center guide pin)

[0138] As Figure 17 shown, the manufacturing method S200 of the center guide pin includes the design method S100 of the center guide pin and the process S210 of manufacturing the center guide pin designed by the design method S100 of the center guide pin. That is, in the process S190 of designing the center guide pin, the center guide pin 7 with the center position G1 of the pair of positioning surfaces 74 eccentric in the horizontal direction Dh is manufactured by a processing machine (not shown) such that the position of the partition plate 3 in the horizontal direction Dh is within a specified tolerance with respect to the upper half machine chamber 41.

[0139] Here, for example, in the case of newly installing a steam turbine 1, a new center guide pin 7 is manufactured such that the center position G1 of a pair of positioning surfaces 74 in the horizontal direction Dh coincides with the pin shaft O1. Further, when performing maintenance on the existing steam turbine 1, at that time, the center guide pin 7 installed in the upper half machine chamber 41 is modified, and one of the pair of positioning surfaces 74 is cut and built up by welding. Thus, the center guide pin 7 is manufactured by correcting it so that the shape of the positioning portion 72 converges within the tolerance.

[0140] (Assembly method of steam turbine)

[0141] When assembling the steam turbine 1, the assembly method S300 of the rotating machine shown below is executed. The assembly method S300 of the rotating machine is implemented when newly installing the steam turbine 1 and when reassembling the existing steam turbine 1 after disassembling it for maintenance or the like. As Figure 18 shown, the assembly method S300 of the rotating machine of the present embodiment includes a manufacturing method S200 of a center guide pin, a process S310 of fixing the center guide pin to the machine chamber, and a process S320 of assembling a partition plate to the machine chamber.

[0142] In the process S310 of fixing the center guide pin to the machine chamber, the center guide pin 7 manufactured by the above-described manufacturing method S200 of the center guide pin is fixed to the inner peripheral surface 41a of the upper half machine chamber 41. Here, the pin base portion 71 of the center guide pin 7 is housed in the recess 412a of the pin mounting portion 412, and the fastening member 73 is fastened. Thus, the center guide pin 7 is fixed to the upper half machine chamber 41. Similarly, the center guide pin 7 is fixed to the inner peripheral surface 41a of the lower half machine chamber 42.

[0143] In the process S320 of assembling the partition plate to the machine chamber, the upper half partition plate 31 formed with the groove portion 312 is assembled to the upper half machine chamber 41 using a hoisting machine such as a crane. The upper half partition plate 31 is placed on the upper half machine chamber 41 such that the positioning portion 72 is inserted into the groove portion 312. By inserting the positioning portion 72 into the groove portion 312, the assembly position of the upper half partition plate 31 in the horizontal direction Dh with respect to the upper half machine chamber 41 can be appropriately adjusted. Similarly, the lower half partition plate 32 formed with the groove portion 312 is assembled to the lower half machine chamber 42 using a hoisting machine such as a crane. Then, the upper half partition plate 31 and the upper half machine chamber 41 are assembled with the lower half partition plate 32 and the lower half machine chamber 42, thereby assembling the steam turbine 1.

[0144] (Function and effect)

[0145] In the design method S100 of the central guide pin in the above structure, it is possible to design the central guide pin 7 by measuring the main parts of the machine chamber 4 and the partition plate 3 without temporarily assembling the partition plate 3 into the machine chamber 4. Specifically, through three-dimensional measurement, the imaginary central axis K1 of the upper half machine chamber 41 and the central position G1 of the central guide pin 7 are obtained. Based on them, the first eccentricity H1 is obtained, so that the offset of the central guide pin 7 as a positioning member relative to the upper half machine chamber 41 can be obtained in a state where the central guide pin 7 and the upper half machine chamber 41 are independent without being assembled. Furthermore, through three-dimensional measurement, the imaginary central axis K2 of the upper half partition plate 31 and the central position G2 of the groove portion 312 are obtained. Based on them, the second eccentricity H2 is obtained, so that the offset of the position and shape of the groove portion 312 formed relative to the upper half partition plate 31 can be obtained in a state where the upper half partition plate 31 is independent. Moreover, based on the first eccentricity H1 and the second eccentricity H2, the positioning portion 72 of the central guide pin 7 is designed. Therefore, when the upper half partition plate 31 is assembled to the upper half machine chamber 41, the central guide pin 7 that can position the upper half partition plate 31 at an appropriate position can be designed. Thus, without repeatedly assembling and adjusting the upper half partition plate 31 relative to the upper half machine chamber 41, the assembly position of the upper half partition plate 31 relative to the upper half machine chamber 41 in the horizontal direction Dh can be appropriately adjusted. Therefore, it is possible to easily center the partition plate 3 relative to the machine chamber 4, and the efficiency of the operation can be achieved.

[0146] In addition, the imaginary central axis K1 of the upper half machine chamber 41 and the central position G1 of the central guide pin 7 are projected onto the machine chamber reference plane P1, which is an imaginary plane on the machine chamber dividing surface 41X, to obtain the first eccentricity H1. Thus, the first eccentricity H1 on an imaginary plane parallel to the machine chamber dividing surface 41X can be obtained in a manner that suppresses the influence of the offset in the vertical direction Dv of the imaginary central axis K1 and the central position G1. Therefore, the first eccentricity H1 can be obtained with higher accuracy.

[0147] In addition, the imaginary central axis K2 of the upper half partition plate 31 and the central position G2 of the groove portion 312 are projected onto the partition plate reference plane P2, which is an imaginary plane on the partition plate dividing surface 31X, to obtain the second eccentricity H2. Thus, the second eccentricity H2 on an imaginary plane parallel to the partition plate dividing surface 31X can be obtained in a manner that suppresses the influence of the offset in the vertical direction Dv of the imaginary central axis K2 and the central position G2. Therefore, the second eccentricity H2 can be obtained with higher accuracy.

[0148] In addition, at the middle position of the positioning portion 72 of the central guide pin 7 on the axial direction Da, the outer shape of the positioning portion 72 is measured. When the central guide pin 7 is installed in the upper half chamber 41 and the lower half chamber 42, there is a case where the central guide pin 7 rotates around the pin shaft O1 and is fixed to the upper half chamber 41 and the lower half chamber 42. As a result, there is a case where the positioning portion 72 is arranged in such a manner that a pair of positioning surfaces 74 are inclined with respect to the axis Ar. If the positioning portion 72 is arranged obliquely in this way, the positions of the positioning surfaces 74 are shifted at both ends of the positioning portion 72 in the axial direction Da. However, by measuring at the middle position of the positioning portion 72 in the axial direction Da, the influence of the position shift of the positioning surface 74 caused by the inclination of the positioning portion 72 can be suppressed. As a result, the center position G1 of the central guide pin 7 can be obtained with high precision.

[0149] In addition, the sealing fixing surfaces 91A and 91B are measured by three-dimensional measurement, thereby setting the imaginary central axis K1 of the chamber 4. The sealing fixing surfaces 91A and 91B for fixing the sealing members 90A and 90B that seal between the outer peripheral surface of the chamber 4 and the rotor 2 are one of the regions formed with the highest precision on the inner peripheral surface of the chamber 4 in order to improve the sealing performance. By measuring such sealing fixing surfaces 91A and 91B, the imaginary central axis K1 of the chamber 4 can be set with high precision.

[0150] In addition, by measuring the outer peripheral surface 31a of the partition plate 3 multiple times at positions separated along the axial direction Da, the imaginary central axis K2 of the partition plate 3 can be set with high precision.

[0151] In addition, the shape of the groove portion 312 is measured at the middle position of the groove portion 312 in the axial direction Da. Therefore, even if the groove portion 312 is formed obliquely with respect to the upper half partition plate 31 and the lower half partition plate 32, the influence of the inclination of the groove portion 312 can be suppressed. As a result, the center position G2 of the groove portion 312 can be obtained with high precision.

[0152] According to the manufacturing method S200 of the central guide pin having the above structure, a central guide pin 7 that can be easily centered without temporarily assembling the partition plate 3 to the chamber 4 can be efficiently manufactured.

[0153] According to the assembly method S300 of the rotary machine having the above structure, by using the central guide pin 7 that can be easily centered without temporarily assembling the partition plate 3 to the chamber 4, the steam turbine 1 can be efficiently manufactured.

[0154] (Other embodiments)

[0155] As described above, the embodiments of the present invention have been described in detail with reference to the drawings, but the specific structure is not limited to this embodiment, and also includes design changes and the like within the scope not departing from the gist of the present invention.

[0156] It should be noted that in the above-described embodiments, the measurement points measured by three-dimensional measurement are exemplified, but the positions and numbers of the measurement points can be appropriately changed.

[0157] In addition, the steps of the design method S100 of the center guide pin 7, the manufacturing method S200 of the center guide pin, and the assembly method S300 of the rotating machine shown in the above-described embodiments can be appropriately changed.

[0158] In addition, in the above-described embodiments, the steam turbine 1 is exemplified as the rotating machine, but the rotating machine can also be, for example, a compressor or the like.

[0159] <Note>

[0160] The design method S100 of the center guide pin 7, the manufacturing method S200 of the center guide pin, and the assembly method S300 of the rotating machine described in the embodiments are grasped as follows, for example.

[0161] (1) The design method S100 of the central guide pin 7 of the first solution is the design method S100 of the central guide pin 7 of a rotating machine, and the rotating machine includes: a rotor 2 that can rotate about an axis Ar; a machine chamber 4 that extends in the circumferential direction of the rotor 2 and can be separated vertically at a machine chamber dividing surface 41X that is a horizontal plane Sh; a partition plate 3 that is disposed between the machine chamber 4 and the rotor 2, extends in the circumferential direction of the rotor 2, and can be separated vertically at a partition plate dividing surface 31X that is a horizontal plane Sh; a groove portion 312 that is formed on an outer peripheral surface 31a of the partition plate 3 so as to extend in an axial direction Da that extends along the axis Ar; and a central guide pin 7 that is fixed to an inner peripheral surface 41a of the machine chamber 4 that faces the outer peripheral surface 31a of the partition plate 3 and can position the partition plate 3 relative to the machine chamber 4 in a horizontal direction Dh that is orthogonal to the axial direction Da by being inserted into the groove portion 312. Among them, the design method S100 of the central guide pin 7 includes: at a plurality of measurement positions spaced apart along the axial direction Da, measuring the inner peripheral surface 41a of the machine chamber 4 by three-dimensional measurement to obtain a plurality of center points of the machine chamber 4 when viewed from the axial direction Da, and setting a virtual central axis K1 of the machine chamber 4 based on the plurality of center points of the machine chamber 4 in step S120; measuring the outer shape of the central guide pin 7 by three-dimensional measurement to obtain a central position G1 of the central guide pin 7 in the horizontal direction Dh in step S130; obtaining an eccentricity of the central position G1 of the central guide pin 7 in the horizontal direction Dh relative to the virtual central axis K1 of the machine chamber 4 as a first eccentricity H1 in step S140; measuring the outer peripheral surface 31a of the partition plate 3 by three-dimensional measurement to obtain a center point of the partition plate 3 when viewed from the axial direction Da, and setting a virtual central axis K2 of the partition plate 3 based on the center point of the partition plate 3 in step S160; measuring the shape of the groove portion 312 by three-dimensional measurement to obtain a central position G2 of the groove portion 312 in the horizontal direction Dh in step S170; obtaining an eccentricity of the central position G2 of the groove portion 312 in the horizontal direction Dh relative to the virtual central axis K2 of the partition plate 3 as a second eccentricity H2 in step S180; and designing the central guide pin 7 based on the first eccentricity H1 and the second eccentricity H2 such that the position of the partition plate 3 in the horizontal direction Dh in a state where the partition plate 3 is assembled to the machine chamber 4 is within a specified tolerance relative to the machine chamber 4 in step S190. As an example of the rotating machine, a steam turbine and a compressor can be cited.

[0162] In the design method S100 of the center guide pin 7, it is possible to design the center guide pin 7 by measuring the main parts of the machine chamber 4 and the partition plate 3 without temporarily assembling the partition plate 3 into the machine chamber 4. Specifically, the imaginary central axis K1 of the machine chamber and the central position G1 of the center guide pin 7 are obtained by three-dimensional measurement. Based on them, the first eccentricity H1 is obtained, so that the offset amount of the center guide pin 7 as a positioning member relative to the machine chamber can be obtained in a state where the center guide pin 7 and the machine chamber are independent of each other. Furthermore, by three-dimensional measurement, the imaginary central axis K2 of the partition plate and the central position G2 of the groove portion 312 are obtained. Based on them, the second eccentricity H2 is obtained, so that the offset amount of the position and shape formed by the groove portion 31 relative to the partition plate can be obtained in a state where the partition plate is independent. Moreover, the center guide pin 7 is designed based on the first eccentricity H1 and the second eccentricity H2. Therefore, it is possible to design the center guide pin 7 that can position the partition plate at an appropriate position when the partition plate is assembled into the machine chamber. Thus, without repeatedly assembling and adjusting the partition plate relative to the machine chamber, the assembly position of the partition plate relative to the machine chamber in the horizontal direction Dh can be appropriately adjusted. Therefore, it is possible to easily center the partition plate 3 relative to the machine chamber 4, and the efficiency of the operation can be realized.

[0163] (2) The design method S100 of the center guide pin 7 of the second aspect On the basis of the design method S100 of the center guide pin 7 in (1), the design method S100 of the center guide pin 7 further includes: a process S110 of measuring the machine chamber dividing surface 41X by three-dimensional measurement, thereby setting the machine chamber reference plane P1 as an imaginary plane on the machine chamber dividing surface 41X. In the process S140 of obtaining the first eccentricity H1, the imaginary central axis K1 of the machine chamber 4 and the central position G1 of the center guide pin 7 are projected onto the machine chamber reference plane P1 to obtain the first eccentricity H1.

[0164] Thus, the first eccentricity H1 on an imaginary plane parallel to the machine chamber dividing surface 41X can be obtained in a manner that suppresses the influence of the offset in the vertical direction Dv of the imaginary central axis K1 and the central position G1. Therefore, the first eccentricity H1 can be obtained with higher accuracy.

[0165] (3) The design method S100 of the center guide pin 7 of the third aspect On the basis of the design method S100 of the center guide pin 7 in (1) or (2), the design method S100 of the center guide pin 7 further includes: a process S150 of measuring the partition plate dividing surface 31X by three-dimensional measurement, thereby setting the partition plate reference plane P2 as an imaginary plane on the partition plate dividing surface 31X. In the process S180 of obtaining the second eccentricity H2, the imaginary central axis K2 of the partition plate 3 and the central position G2 of the groove portion 312 are projected onto the partition plate reference plane P2 to obtain the second eccentricity H2.

[0166] Thus, it is possible to obtain the second eccentricity H2 on the imaginary plane parallel to the partition surface 31X of the partition plate in a manner that suppresses the influence of the deviation of the imaginary central axis K2 and the central position G2 in the vertical direction Dv. Therefore, the second eccentricity H2 can be obtained with higher precision.

[0167] (4) The design method S100 of the center guide pin 7 in the fourth aspect is based on the design method S100 of the center guide pin 7 in any one of (1) to (3). The center guide pin 7 includes a positioning portion 72 disposed inside the groove portion 312 in a state of being fixed to the machine chamber 4. In the process S130 of obtaining the center position G1 of the center guide pin 7, the outer shape of the positioning portion 72 is measured at the intermediate position of the positioning portion 72 in the axial direction Da.

[0168] Thus, by measuring at the intermediate position of the positioning portion 72 in the axial direction Da, it is possible to suppress the influence of the position deviation of the positioning surface 74 caused by the inclination of the positioning portion 72. As a result, the center position G1 of the center guide pin 7 can be obtained with high precision.

[0169] (5) The design method S100 of the center guide pin 7 in the fifth aspect is based on the design method S100 of the center guide pin 7 in any one of (1) to (4). The machine chamber 4 has a plurality of sealing and fixing surfaces 91A, 91B. Annular sealing members 90A and 90B for sealing between the machine chamber 4 and the outer peripheral surface of the rotor 2 are fixed to the sealing and fixing surfaces 91A, 91B. In the process S120 of setting the imaginary central axis K1 of the machine chamber 4, the plurality of sealing and fixing surfaces 91A and 91B are measured by three-dimensional measurement, thereby obtaining a plurality of center points J1 and J2 of the machine chamber 4.

[0170] In this way, in order to improve the sealing performance, the sealing and fixing surfaces 91A and 91B to which the sealing members 90A and 90B for sealing between the machine chamber 4 and the outer peripheral surface of the rotor 2 are fixed are one of the regions formed with the highest precision in the inner peripheral surface of the machine chamber 4. By measuring such sealing and fixing surfaces 91A and 91B, the imaginary central axis K1 of the machine chamber 4 can be set with high precision.

[0171] (6) The design method S100 of the center guide pin 7 in the sixth aspect is based on the design method S100 of the center guide pin 7 in any one of (1) to (5). In the process S160 of setting the imaginary central axis K2 of the partition plate 3, the outer peripheral surface 31a of the partition plate 3 is measured multiple times at positions separated along the axial direction Da.

[0172] Thus, by measuring the outer peripheral surface 31a of the partition plate 3 multiple times at positions separated along the axial direction Da, the imaginary central axis K2 of the partition plate 3 can be set with high precision.

[0173] (7) The design method S100 of the center pin 7 of the seventh embodiment is based on the design method S100 of the center pin 7 in any one of (1) to (6). In the process S170 of obtaining the center position G2 of the groove portion 312, the shape of the groove portion 312 is measured at the intermediate position of the groove portion 312 in the axial direction Da.

[0174] Thereby, even if the groove portion 312 is formed obliquely with respect to the partition plate, the influence of the inclination of the groove portion 312 can be suppressed. As a result, the center position G2 of the groove portion 312 can be obtained with high precision.

[0175] (8) The manufacturing method S200 of the center pin of the eighth embodiment includes a process S210 of manufacturing the center pin 7 designed by the design method S100 of the center pin 7 in any one of (1) to (7).

[0176] Thereby, the center pin 7 that can be easily centered without temporarily assembling the partition plate 3 into the machine chamber 4 can be manufactured efficiently.

[0177] (9) The assembling method S300 of the rotating machine of the ninth embodiment includes: a process S310 of fixing the center pin 7 manufactured by the manufacturing method S200 of the center pin in (8) to the inner peripheral surface 41a of the machine chamber 4; and a process S320 of assembling the partition plate 3 formed with the groove portion 312 into the machine chamber 4 and fitting the center pin 7 into the groove portion 312.

[0178] Thereby, by using the center pin 7 that can be easily centered without temporarily assembling the partition plate 3 into the machine chamber 4, the steam turbine 1 can be manufactured efficiently.

[0179] Industrial Applicability

[0180] According to the design method of the center pin, the manufacturing method of the center pin, and the assembling method of the rotating machine of the present invention, the partition plate can be easily centered with respect to the machine chamber, and the work efficiency can be improved.

Claims

1. A design method for a central guide pin, which is a design method for the central guide pin of a rotating machine. The rotating machine includes: A rotor that can rotate about an axis; A machine chamber that extends along the circumferential direction of the rotor and can be separated vertically at a machine chamber dividing surface that is a horizontal plane; A partition plate that is disposed between the machine chamber and the rotor, extends along the circumferential direction of the rotor, and can be separated vertically at a partition plate dividing surface that is a horizontal plane; A groove portion that is formed on the outer peripheral surface of the partition plate in a manner that extends axially along the axis; And A central guide pin that is fixed to the inner peripheral surface of the machine chamber facing the outer peripheral surface of the partition plate and can position the partition plate relative to the machine chamber in a horizontal direction orthogonal to the axis by being inserted into the groove portion. Wherein, The design method of the central guide pin includes the following steps: At a plurality of measurement positions spaced apart along the axis, measure the inner peripheral surface of the machine chamber by three-dimensional measurement to obtain a plurality of center points of the machine chamber when viewed from the axis, and set a virtual central axis of the machine chamber based on the plurality of center points of the machine chamber; Measure the outer shape of the central guide pin by three-dimensional measurement to obtain the central position of the central guide pin in the horizontal direction; Obtain the eccentricity of the central position of the central guide pin in the horizontal direction relative to the virtual central axis of the machine chamber as a first eccentricity; Measure the outer peripheral surface of the partition plate by three-dimensional measurement to obtain the center point of the partition plate when viewed from the axis, and set a virtual central axis of the partition plate based on the center point of the partition plate; Measure the shape of the groove portion by three-dimensional measurement to obtain the central position of the groove portion in the horizontal direction; Obtain the eccentricity of the central position of the groove portion in the horizontal direction relative to the virtual central axis of the partition plate as a second eccentricity; And Based on the first eccentricity and the second eccentricity, design the central guide pin such that the horizontal position of the partition plate in a state where the partition plate is assembled to the machine chamber is within a specified tolerance relative to the machine chamber.

2. The design method of the central guide pin according to claim 1, wherein, The design method of the central guide pin further includes the following step: Measure the machine chamber dividing surface by three-dimensional measurement to set a machine chamber reference plane that is a virtual plane on the machine chamber dividing surface. In the step of obtaining the first eccentricity, project the virtual central axis of the machine chamber and the central position of the central guide pin onto the machine chamber reference plane to obtain the first eccentricity.

3. The design method of the central guide pin according to claim 1 or 2, wherein, The design method of the central guide pin further includes the following step: Measure the partition plate dividing surface by three-dimensional measurement to set a partition plate reference plane that is a virtual plane on the partition plate dividing surface. In the step of obtaining the second eccentricity, project the virtual central axis of the partition plate and the central position of the groove portion onto the partition plate reference plane to obtain the second eccentricity.

4. The design method of the central guide pin according to claim 1 or 2, wherein, the central guide pin has a positioning portion disposed inside the groove portion while being fixed to the machine chamber, in the process of obtaining the central position of the central guide pin, the outer shape of the positioning portion is measured at the middle position of the positioning portion in the axial direction.

5. The design method of the central guide pin according to claim 1 or 2, wherein, the machine chamber has a plurality of sealing and fixing surfaces, and an annular sealing member for sealing between the machine chamber and the outer peripheral surface of the rotor is fixed to the sealing and fixing surfaces, in the process of setting the imaginary central axis of the machine chamber, a plurality of the sealing and fixing surfaces are measured by three-dimensional measurement to obtain a plurality of center points of the machine chamber.

6. The design method of the central guide pin according to claim 1 or 2, wherein, in the process of setting the imaginary central axis of the partition plate, the outer peripheral surface of the partition plate is measured multiple times at different positions in the axial direction.

7. The design method of the central guide pin according to claim 1 or 2, wherein, in the process of obtaining the central position of the groove portion, the shape of the groove portion is measured at the middle position of the groove portion in the axial direction.

8. A manufacturing method of a central guide pin, wherein, the manufacturing method of the central guide pin includes a process of manufacturing the central guide pin designed by the design method of the central guide pin according to any one of claims 1 to 7.

9. An assembly method of a rotating machine, wherein, the assembly method of the rotating machine includes the following processes: fixing the central guide pin manufactured by the manufacturing method of the central guide pin according to claim 8 to the inner peripheral surface of the machine chamber; and assembling the partition plate formed with the groove portion to the machine chamber and inserting the central guide pin into the groove portion.

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