JPH0828202A - Assembling method for shaft structure - Google Patents

Abstract

PURPOSE:To relax the bending of a shaft and to prevent the generation of unbalance by measuring the most recessed part and the most projecting part on the basis of the surface perpendicular to an axis the end surface of each part, and applying markings to the respective parts to determine the assembling phase to conduct assembling by utilizing the markings. CONSTITUTION:When the compressor impeller 2 is assembled adjacent to a turbine rotor 3, the most projecting part on the basis of the surface perpendicular to an axis in the end surface on the impeller 2 side of a shaft part 3a of the turbine rotor 3 integrated with a rotary shaft 5 is measured at first, and a marking 6 for clarifying the part is applied to the end peripheral surface of the shaft part 3a by an electric pen or the like. The most recessed part of the shaft part 2a of the impeller 2 on the basis of the surface perpendicular to the axis in the end surface of the turbine rotor 3 is measured, and similarly a marking 7 is applied to the part by an electric pen or the like. After both markings 6, 7 are combined to determine the assembling phase in circumferential direction relative to the rotary shaft 5 of the compressor impeller 2, the impeller 2 is assembled to the rotary shaft 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to, for example, a gas turbine,
The present invention relates to a method for assembling a shaft structure such as a rotary shaft in a high-speed rotating device such as a turbomachine, and more particularly to a technique for relaxing a shaft bend.

[0002]

2. Description of the Related Art Conventionally, a gas turbine is one of the devices that rotate at high speed. As this gas turbine,
A configuration as shown in FIG. 7 is known. (See JP-A-2-271033). That is, in the gas turbine, the compressor impeller 2 and the turbine rotor 3 are joined back-to-back and close to each other, and the compressor diffuser portion 2A is provided on the outer peripheral portion of the compressor impeller 2.
A turbine nozzle portion 3A is provided on the outer peripheral portion of the turbine rotor 3,
Each has its own configuration.

In this case, the turbine rotor 3 is integrally formed at the end of the rotary shaft 5, and the rotary shaft 5 is supported by the rolling bearing 4. A collar 1 and a compressor impeller 2 are mounted on an outer peripheral portion of the rotating shaft 5, which is overhung from a supporting portion of the rolling bearing 4 by the rolling bearing 4.

[0004]

By the way, in the shaft structure of such a gas turbine, there is a large overhang from the support portion of the rolling shaft 5 by the rolling bearing 4, and the outer peripheral portion of the overhung rotary shaft 5 is Since the collar 1, the compressor impeller 2, and the turbine rotor 3 are supported, the following problems arise.

That is, there is a deviation in the squareness of the assembly end faces of the rolling bearing 4, the collar 1, the compressor impeller 2, and the turbine rotor 3 with respect to each other, and the concave portion or the portion is formed with respect to the plane perpendicular to the axis. When there is a convex portion, when the collar 1 and the compressor impeller 2 are assembled to the overhanging portion of the rotary shaft 5 integrally formed with the turbine rotor 3, as shown in FIG. 8, the rotary shaft 5 is bent. , A large imbalance will occur.

As a result, vibration and noise are generated, and at the same time,
The bearing life will be shortened. It is also difficult to correct this with a large imbalance. Therefore, in view of the conventional problems as described above, the present invention is a shaft structure in which parts are mounted on a shaft, and other parts are provided on a shaft outer peripheral portion overhanging from a support portion by a bearing as one of the parts. In a shaft structure in which at least one component is assembled, the assembly end face with the mating end face of the component whose adjacent end faces are joined,
By adopting a unique method for assembly when there is a deviation of squareness and there is a concave part or a convex part on the basis of the plane perpendicular to the axis, the bending of the shaft is alleviated as much as possible. The purpose is to suppress the occurrence of a large imbalance.

[0007]

Therefore, the invention according to claim 1 has a shaft structure in which parts are mounted on a shaft, and the shaft outer peripheral portion is overhung from a support portion by a bearing as one of the parts. In the shaft structure in which at least one other part is assembled, the concave part and the convex part are measured with respect to the surface perpendicular to the axis of the end face of each part, and both parts are measured for each part. The parts are attached in the circumferential direction with respect to the shaft so that the concave parts of the parts whose adjacent end faces are joined and the convex parts match according to the marking. The phase was decided and each part was attached to the shaft.

According to a second aspect of the present invention, the concave portion and the convex portion are set by inserting parts through a shaft having center holes on both end faces, and the both ends of the shaft on which the parts are set are measuring machine main body. It is supported by a pair of center members, and the probe of the dial gauge is applied to the end surface of the collar, the collar is rotated once, and the portion where the dial gauge swings to the most convex side or the concave side is confirmed and measured. .

According to a third aspect of the present invention, the concave portion and the convex portion are placed on a surface plate, and a probe of a three-dimensional measuring instrument is brought into contact with the end surface of the component to form an inner diameter surface of the component. By picking multiple points on the part and picking multiple parts on the end face, the direction of the end face of the part is determined,
The convex portion was detected and measured.

[0010]

In the invention according to claim 1, the most concave part and the most convex part are measured with reference to the axis-perpendicular surface of the end face of each part to clarify both parts in each part. Marking is performed, and the assembling phase in the circumferential direction with respect to the axis of each component is determined so that the markings match each other.
Since each part is assembled on the shaft, there is a part that is concave or convex with respect to the surface perpendicular to the axis because there is a deviation in squareness on the assembly end surface of each part with each other. However, by matching the most concave part and the most convex part, the deviation of the squareness is almost offset, and even if parts are assembled to the overhanging part from the bearing support part of the shaft, Bending is mitigated and imbalance is reduced. As a result, the generation of vibration and noise can be suppressed, the life of the bearing can be improved, and the imbalance can be corrected.

According to the second aspect of the invention, the concave portion or the convex portion can be easily measured using a dial gauge. In the invention of claim 3, the concave portion or the convex portion can be easily measured using a three-dimensional measuring device.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. In the method of assembling the shaft structure according to the first aspect of the present invention, the concave portion and the convex portion are measured with reference to the surface perpendicular to the axis of the end face of each component, and both components are revealed in each component. According to the marking, the assembling phase in the circumferential direction with respect to the axis of each part is adjusted so that the concave part and the convex part of the parts whose adjacent end faces are joined match each other. Decide and attach each part to the shaft.

Here, FIG. 1 shows a rotary shaft portion of a gas turbine as an embodiment of the shaft structure of the present invention, and a turbine rotor 3 is integrally formed at the end of the rotary shaft 5. The rotary shaft 5 is supported by the rolling bearing 4. The structure in which the collar 1 and the compressor impeller 2 are mounted on the outer peripheral portion of the rotary shaft 5 overhanging from the support portion of the rolling bearing 4 is the same as the conventional one.

A case where the above-mentioned assembling method is applied to the rotary shaft 5 of such a gas turbine will be described. On the rotary shaft 5,
The compressor impeller 2 is assembled adjacent to the turbine rotor 3 integrally formed on the rotary shaft 5 in advance, the collar 1 is assembled next to the compressor impeller 2, and the rolling bearing 4 is adjacent to the collar 1. Is assembled.

First, a method of assembling the compressor impeller 2 adjacent to the turbine rotor 3 in FIG. 2 will be described. First, the most convex portion of the end surface of the shaft portion 3a of the turbine rotor 3 formed integrally with the rotating shaft 5 that contacts the end surface of the compressor impeller 2 is measured with reference to the axis-perpendicular surface. This measuring method will be described later. Next, a marking 6 is formed on the outer peripheral surface of the end portion of the shaft portion 3a of the turbine rotor 3 to clarify the most convex portion.
With an electric pen or the like.

Next, the shaft portion 2a of the compressor impeller 2
Of the end surface of the turbine rotor 3 which is in contact with the end surface of the turbine rotor 3 is measured with reference to the surface perpendicular to the axis, and the most convex portion is clarified on the outer peripheral surface of the end of the shaft portion 2a of the compressor impeller 2. The marking 7 is marked with an electric pen or the like. When the compressor impeller 2 is assembled to the rotary shaft 5, the marking 6 of the turbine rotor 3 and the marking 7 of the compressor impeller 2 are combined so that the most convex portion of the end surface of the turbine rotor 3 and the most concave portion of the compressor impeller 2 are formed. The assembling phase of the compressor impeller 2 in the circumferential direction with respect to the rotary shaft 5 is determined so as to match the parts, and the compressor impeller 2 is assembled to the rotary shaft 5. That is, the marking 6,
7, the mounting phase of the compressor impeller 2 in the circumferential direction with respect to the rotating shaft 5 is determined so that the concave part and the convex part match, and the compressor impeller 2
Is assembled to the rotary shaft 5.

Next, a method of assembling the collar 1 adjacent to the compressor impeller 2 in FIG. 3 will be described. First, the most convex portion of the end surface of the shaft portion 2b of the compressor impeller 2 that comes into contact with the end surface of the collar 1 is measured with reference to the plane perpendicular to the axis, and the compressor impeller 2
On the outer peripheral surface of the end portion of the shaft portion 2b, a marking 8 for clarifying the most convex portion is applied with an electric pen or the like.

Next, the color 1 compressor impeller 2
Of the end surface that comes into contact with the end surface of the collar, the most concave portion is measured on the basis of the plane perpendicular to the axis, and the marking 9 for clarifying the most convex portion is provided on the outer peripheral surface of the end of the collar 1 on an electric pen or the like. Apply. Then, when the collar 1 is assembled to the rotary shaft 5, the marking 8 of the compressor impeller 2 and the marking 9 of the collar 1 are aligned, and the most convex portion of the compressor impeller 2 and the most concave portion of the collar 1 are matched. As described above, the assembling phase of the collar 1 in the circumferential direction with respect to the rotating shaft 5 is determined, and the collar 1 is assembled to the rotating shaft 5.

Next, referring to FIG. 4, a method of assembling the rolling bearing 4 adjacent to the collar 1 will be described. First, the most convex portion of the end surface of the collar 1 which is in contact with the end surface of the rolling bearing 4 is measured with reference to the axis-perpendicular surface, and the most convex portion is clarified on the outer peripheral surface of the end portion of the collar 1. The marking 10 is marked with an electric pen or the like.

Next, the most concave portion of the end surface of the rolling bearing 4 which is in contact with the end surface of the collar 1 is measured with reference to the axis-perpendicular surface, and the outermost surface of the end portion of the rolling bearing 4 is marked with the most convex portion. Marking 11 for clarifying the different portion is applied with an electric pen or the like. Then, when the rolling bearing 4 is assembled to the rotary shaft 5, the marking 10 of the collar 1 and the marking 11 of the rolling bearing 4 are aligned so that the most convex portion of the collar and the most concave portion of the rolling bearing are aligned. Thus, the assembling phase of the rolling bearing 4 in the circumferential direction with respect to the rotating shaft 5 is determined, and the rolling bearing 4 is assembled to the rotating shaft 5.

Here, a method of measuring a concave portion and a convex portion with reference to the axis-perpendicular surface of the end face of each component will be described by taking the collar 1 as an object to be measured. FIG. 5 shows a measuring method using a dial gauge (the invention according to claim 2). The collar 1 is inserted into and set on the shaft 13 having the center holes 12 on both end faces. As the shaft 13, there is used one having a tapered fit with the inner diameter of the collar 1 and having a gradient of several μm, or one having a clearance between the inner circumference of the collar 1 and the inner surface which can be removed.

Shaft 13 having such collar 1 set
Both ends are supported by a pair of sine bars 16 with a center 15 of the measuring machine main body 14, a gauge head 18 of a dial gauge 17 is applied to one end face of the collar 1, and the collar 1 is rotated once to make the dial gauge 17 Check the part that swings most to the convex side or the concave side, and mark the outer peripheral surface of the end of the collar 1 corresponding to this part. The same measurement is performed on one end surface of the collar 1.

FIG. 6 shows a measuring method using a three-dimensional measuring device (the invention according to claim 3). Place the color 1 on the surface plate 18, and attach the probe 1 of the CMM to the upper end surface of the color 1.
9 is brought into contact, the inner peripheral surface B of the collar 1 is picked at a plurality of points, and the end surface A of the collar 1 is picked at a plurality of points. It detects a convex portion.

The collar 1 is turned upside down and placed on the surface plate 18, and the same measurement is performed on the other end surface of the collar 1. This measuring method can be similarly applied to the turbine rotor 3, the compressor impeller 2, and the rolling bearing 4. According to the above assembling method of the shaft structure, the marking that clarifies both parts on each part by measuring the most concave part and the most convex part with reference to the surface perpendicular to the axis of the end face of each part Since the mounting phase of each component in the circumferential direction with respect to the rotary shaft is determined so that the markings match each other and each component is mounted on the rotary shaft, the rolling bearing 4, the collar 1, the compressor impeller 2. Even if the end surface of the turbine rotor 3 assembled with each other has a squareness deviation, and there is a concave portion or a convex portion with respect to the plane perpendicular to the axis, the concave portion is the most concave portion. When the collar 1 and the compressor impeller 2 are assembled to the overhanging portion of the rotary shaft 5 on which the turbine rotor 2 is integrally molded, the deviation of the squareness is substantially canceled by matching the above and the most convex portion. , Bending of the rotary shaft 5 is relaxed, imbalance is reduced.

As a result, the generation of vibration and noise can be suppressed, the life of the bearing can be improved, and the imbalance can be corrected. In addition, in the above-mentioned embodiment, the example in which the inventions of claims 1 to 3 are applied to the rotary shaft 5 of the gas turbine has been described. However, a part such as a rotary shaft in a high-speed rotating device such as a turbomachine is mounted on the shaft. It can be applied to a shaft structure that is mounted, and at least one other part is assembled to the shaft outer peripheral part that overhangs from the support part by the bearing as one of the parts, and the same effect can be obtained. Obtainable.

[0026]

As described above, according to the first aspect of the invention, there is provided a shaft structure in which parts are mounted on the shaft,
In a shaft structure in which at least one other part is assembled to the shaft outer peripheral part that overhangs from the support part by the bearing as one of the parts, there is a deviation of squareness on the assembly end surface of each part So, even if there is a concave part or a convex part with respect to the plane perpendicular to the axis,
By matching the most concave part and the most convex part, the deviation of the squareness is canceled out, and the bending of the shaft is alleviated even if parts are assembled to the overhanging part from the bearing support part of the shaft. Therefore, the imbalance is reduced. As a result, the generation of vibration and noise can be suppressed, the life of the bearing can be improved, and the imbalance can be corrected.

According to the second aspect of the present invention, a concave portion or a convex portion can be easily measured using a dial gauge. In the invention of claim 3, the concave portion or the convex portion can be easily measured using a three-dimensional measuring device.

[Brief description of drawings]

FIG. 1 is a schematic sectional view of a gas turbine for explaining an embodiment of the invention described in claim 1.

FIG. 2 is a perspective view illustrating a method of assembling the compressor impeller according to the above embodiment.

FIG. 3 is a perspective view illustrating a method of assembling a collar according to the above embodiment.

FIG. 4 is a perspective view illustrating a method of assembling the rolling bearing according to the embodiment.

FIG. 5 is a front view showing a measuring method using a dial gauge as a method for measuring a concave portion and a convex portion.

FIG. 6 is a front view showing a measuring method using a three-dimensional measuring device as a method for measuring a concave portion and a convex portion.

FIG. 7 is a cross-sectional view of a gas turbine

FIG. 8 is a schematic cross-sectional view illustrating a conventional problem.

[Explanation of symbols]

 1 Color 2 Compressor Impeller 3 Turbine rotor 4 Rolling bearing 5 Rotating shaft 6 Marking 7 Marking 8 Marking 9 Marking 10 Marking 11 Marking 12 Center hole 13 Shaft 15 Pair of center 16 Sign bar 17 Dial gauge 18 Surface plate 19 Three-dimensional measuring instrument Probe

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display location F02C 7/20 Z F16D 1/06

Claims (3)

[Claims] 1. A shaft structure comprising parts mounted on a shaft,
In a shaft structure in which at least one other part is assembled to the shaft outer peripheral part that overhangs from the support part by the bearing as one of the parts, the part that becomes concave with respect to the surface perpendicular to the axis of the end surface of each part , A convex portion is measured, and marking is made on each component to clarify both portions, and according to the marking, a concave portion of a component whose end faces are joined to each other and a convex portion The assembly method of the shaft structure, characterized in that the assembling phase of each component in the circumferential direction with respect to the shaft is determined so that each component is assembled to the shaft. 2. The concave portion and the convex portion are set by inserting parts through a shaft having center holes on both end surfaces, and the both ends of the shaft on which the parts are set are set as a pair of center members of the measuring machine main body. The dial gauge is applied to the end face of the collar, the collar is rotated once, and the portion where the dial gauge swings to the most convex side or the concave side is confirmed and measured. Shaft structure assembling method. 3. The concave portion and the convex portion, the component is placed on a surface plate, the probe of the three-dimensional measuring instrument is brought into contact with the end surface of the component, and the inner diameter surface of the component is picked at a plurality of points. The axial structure according to claim 1, wherein the end face of the component is tilted by picking the end faces of the component at a plurality of positions, and a concave portion and a convex portion are detected and measured. Assembly method.