JP4288136B2 - Axial movement preventing member and method of attaching axial movement preventing member to columnar rotating body - Google Patents

Description

The present invention relates to an axial movement preventing member that suppresses axial movement of a rotating body by attaching to the rotating body and contacting a fixed member, and a method of attaching the axial movement preventing member to a columnar rotating body .

  In many fields, gas turbines and steam turbines are used to drive generators or work machines. In that case, the energy contained in the combustion gas or steam is used to rotationally drive the turbine shaft. The combustion gas or steam is led to a turbine unit where it expands while working.

  The turbine includes a turbine rotor that performs rotational motion, a moving blade row that is attached to the turbine rotor in a plurality of stages in the axial direction, and a stationary blade row that is disposed between the moving blade rows. The rotor blade row has a plurality of rotor blades that are attached radially around the turbine rotor at equal central angular intervals.

As a method of attaching the moving blade to the turbine rotor, there is a method of attaching the blade while rotating the turbine rotor. FIG. 6 shows a schematic view of a method for attaching the moving blades to the turbine rotor of the steam turbine.

  The steam turbine ST shown in FIG. 6 includes a rotor Ro, coupling portions CP at both ends, a bearing portion Ju supported when the rotor Ro rotates inside the coupling portion CP, and the like in the circumferential direction. And a plurality of blades Pr attached at a central angle interval.

As shown in FIG. 6B, the steam turbine ST is rotatably supported by disposing the bearing portion Ju on the roller rotating machine Rm. At this time, the roller rotating machine Rm is not limited to this, but here, two identical rollers Rr are arranged side by side on the housing Rh via the rotating shaft, and the roller Rr is not shown with the shaft as the center. The motor rotates in the same direction (here, as shown in FIG. 6B, counterclockwise).

The bearing portion Ju is formed with a flange portion F called a collar-like thrust at both ends. Conditioning of the surface roughness is severe on the bearing side of the bowl-shaped portion F because the lubricating oil for the bearing is lubricated. When mounting the steam turbine ST plant, by attaching the bearings (not shown) to the bearing portion Ju, rotor Ro is rotatably supported. The member on the rotating shaft side of the bearing is attached in contact with the flange portion F of the bearing portion Ju.

  The rotor Pr is attached to the rotor Ro by the following procedure. First, the roller Rr of the roller rotating machine Rm is rotated or rotated by a rotating machine (not shown) connected directly to the rotor Ro. The rotor Ro is rotated.

  After rotating the rotor Ro by a predetermined angle, the rotation of the rotor Ro is stopped, and the moving blade Pr is attached and fixed at a predetermined position of the rotor Ro. After that, after attaching and fixing the moving blade Pr over the entire circumference of the rotor Ro, the rotor Ro is continuously rotated at a rotational speed lower than the rotational speed during operation to check whether the moving blade Pr is correctly attached.

  When attaching the rotor blade Pr to the rotor Ro at a factory or the like, it is difficult to make it horizontal with high precision or align the shafts due to problems of working time, labor, and cost. As shown in FIG. There are cases where the heights of the installation positions of the roller rotators Rm on both sides supporting the bearing portion Ju are different (α in the figure), that is, the rotor Ro cannot be installed horizontally. When the rotor Ro is rotated in this state, the rotor Ro slides in the axial direction toward the lower side of the roller Rr.

As the rotor Ro moves in the axial direction, the flange portion F of the bearing portion Ju comes into contact with the roller rotating machine Rm.
The hook-shaped portion F has severe surface roughness conditions, and the roller Rr of the roller rotator Rm has rubber attached to the surface, and even if it contacts the hook-shaped portion F, the hook-shaped portion F is hardly damaged. The housing Rh is a bare material, and when it comes into contact with the housing Rh, a flaw-like portion F may be damaged and the surface roughness condition may not be satisfied.

Regarding the above problems, a ring made of a soft material such as rubber is attached to the flange portion F of the bearing portion Ju, and the sensor Ce is attached to one of the coupling CPs formed at both ends of the rotor Ro. The state of the mounting rotor Ro, such as the position and tilt, is monitored. When the sensor Ce detects that the rotor Ro has moved in the axial direction by a predetermined amount or more, the rotation of the rotor Ro is stopped.
JP-A-63-306209

  However, in the case where the ring is attached to the bowl-shaped portion F and the state of the rotor Ro is monitored by the sensor Ce, the ring is produced according to the shape of the bearing portion Ju, and is produced each time the shape of the bearing portion Ju changes. It must be reworked, and it takes time and money. In addition, the packing can be used as a ring, but the packing often has insufficient strength.

  Furthermore, since the sensor Ce is attached to the coupling part CP, the sensor Ce and a set of equipment necessary for monitoring using the sensor Ce are necessary, and the manufacturing apparatus of the steam turbine ST becomes a complicated apparatus. Further, when the ring attached to the flange portion F of the bearing portion Ju and the roller rotator Rm come into contact with each other, the rotation of the rotor Ro is stopped and the rotation is started again after the rotor Ro is rearranged. .

Further, in addition to the one that attaches the moving blade to the turbine rotor Ro as described above, in many machines, it is generated that the rotating shaft moves in the axial direction by such an axial force (thrust). It is the cause of the malfunction of the machine.

In view of such a problem, the present invention can be attached regardless of the diameter of the columnar rotating body, and can be manufactured at a low cost with a simple structure. An object of the present invention is to provide an axial movement preventing member for a rotating shaft capable of suppressing movement and a method for attaching the axial movement preventing member to a columnar rotating body .

The invention further by axial movement preventing member itself is cut, the rotation axis, or scratched to each part of the columnar rotating body flange portion or the like, worn capable axial movement to prevent or It aims at providing the attachment method to the columnar rotary body of a prevention member and an axial direction movement prevention member .

In order to achieve the above-mentioned object, the present invention is attached to the outer peripheral surface of a columnar rotating body having a circular cross section, and is in contact with the flange-shaped overhanging portion provided on the columnar rotating body so as to be in the axial direction. An axial direction movement preventing member that prevents movement to a main body portion and a connecting portion that connects the adjacent main body portions, and the plurality of main body portions are formed by a plurality of the connecting portions. It is connected in a ring shape, and the connecting part is rotatably engaged with the main body part, and at least one of the main body parts can reduce or widen a gap between adjacent main body parts. Provided is an axial movement preventing member that can be fixed to the outer peripheral surface of a columnar rotating body having different outer diameters by appropriately determining the number.

  According to this configuration, the connecting portion can be rotated, and at least one of the connecting portions can reduce or widen the gap between the main body portions, and can be connected by an arbitrary number of the main body portions and the connecting portions. Therefore, it can be used regardless of the diameter of the outer peripheral portion of the rotating body, and the versatility is high.

  The said structure WHEREIN: What has comprised the connection part of the surface which contacts the outer peripheral part of the said rotary body of the said main-body part and the surface which contacts the collar-like overhang | projection part of the said columnar rotary body by a curved surface can be mentioned.

According to this configuration, the columnar portion of the rotating body and the flange-shaped protruding portion of the rotating body are often connected via a curved surface with a small curvature, and the flange-shaped protruding portion and the axial movement preventing member It is possible to reduce the friction by reducing the contact area with and prevent the hook-like overhanging portion from being damaged.

  In the above configuration, a connecting portion that can reduce and widen the gap between the main body portions is rotatably supported at one end portion of the main body portion, and a female screw portion of a right-hand thread is provided at the center portion or the substantially central portion. A right-handed screw pin, a left-handed screw pin that is rotatably supported at the other end of the main body, and has a left-handed female screw at the center or substantially the center, and a right-handed male screw at one end, It has a connecting shaft in which a left-handed male screw is formed at the other end, and the right-handed screw pin and the left-handed screw pin are attached to the main body, and when the main bodies are arranged side by side, The attached right screw pin and the left screw pin are arranged adjacent to each other, the male screw of the right screw of the connecting shaft is screwed with the female screw of the right screw pin, and the male screw of the left screw of the connecting shaft is connected to the left screw pin. Exemplified screw threaded with female thread Can.

  According to this configuration, by rotating the connecting shaft, the adjacent main bodies can be moved in a shrinking direction or a spreading direction, and can be easily attached when attached to the outer periphery of the columnar rotating body having the circular cross section. be able to. In addition, it can be used in various places.

  The said structure WHEREIN: You may provide the rotation prevention member for restrict | limiting the rotation of the said connection shaft.

  According to this configuration, it is possible to prevent loosening of the connecting portion due to the rotation of the columnar rotating body after being attached to the outer periphery of the columnar rotating body having the circular cross section.

  The said structure WHEREIN: The said main-body part may be formed with the member whose intensity | strength is lower than the material which forms the said columnar rotary body and the bowl-shaped overhang | projection part.

  According to this configuration, it is possible to prevent the rotating body and the bowl-shaped overhanging portion from being damaged or worn by the main body being scraped by the columnar rotating body and the bowl-shaped overhanging portion. .

  The said structure WHEREIN: The said connection part may be formed with the member whose intensity | strength is lower than the material which forms the said columnar rotary body and the bowl-shaped overhang | projection part.

  According to this configuration, the connecting portion contacts at least one of the outer periphery of the columnar rotating body and the flange-like protruding portion, and the surface of the member in contact with the connecting portion is scratched or worn. Can be prevented.

  The said structure WHEREIN: You may have a pin omission prevention member which prevents that the said pin falls out by contacting and attaching to the both ends of the said pin.

  According to this configuration, when the pin is pulled out, the connecting portion comes into contact with at least one of the outer periphery of the columnar rotating body and the flange-like protruding portion, and the surface of the member with which the connecting portion is in contact is scratched. It can be prevented from being attached or worn.

The flange-like projecting portion described above is integrally formed with a cylindrical rotary body such as a flange, an oil seal, etc., a nut attached to the cylindrical rotary body, a bearing, etc. It includes a wide range of members provided regardless of non-contact.
Also, an axial movement that is attached to the outer peripheral surface of the columnar rotating body having a circular cross section and that prevents the columnar rotating body from moving in the axial direction by contacting a flange-like protruding portion provided in the columnar rotating body. A method of attaching the prevention member to the columnar rotator, after disposing the axial movement prevention member on the outer peripheral surface of the columnar rotator, reducing the circumference formed by the axial movement prevention member, Provided is a method of attaching an axial movement preventing member to a columnar rotating body, wherein the inner circumferential portion of the axial movement preventing member is fixed in contact with the columnar rotating body.

According to the present invention, it can be attached regardless of the diameter of the columnar rotating body, can be manufactured at a low cost with a simple structure, and the axial movement of the highly versatile rotating body can be suppressed accordingly. An axial movement prevention member can be provided.

Further, according to the present invention, the axial movement preventing member itself is scraped to prevent the respective parts of the columnar rotating body such as the columnar rotating body and the saddle-like overhanging portion from being scratched or worn. A possible axial movement prevention member can be provided.

The best mode for carrying out the present invention will be described with reference to the drawings. FIG. 1A shows a front view of an axial movement preventing member according to the present invention. 1B is a front view of the main body portion of the axial movement preventing member, FIG. 1C is a cross-sectional view of the main body portion, and FIG. 1D is an arrangement of the connecting shaft and support pins of the connecting portion. Each figure is shown.

An axial direction movement preventing member A shown in FIG. 1A includes a main body 1 and a connecting part 2 that connects adjacent axial direction movement preventing members A. The axial direction movement preventing member A has one connecting portion 2 with respect to one main body portion 1.

  As shown in FIG. 1B, the outer peripheral portion 11 of the main body 1 is formed on a curved surface having a predetermined curvature ρ1. Further, the inner peripheral portion 12 is formed in a flat shape, and both the left and right side surfaces are formed in a flat shape from both end surfaces of the outer peripheral portion 11 toward the curvature center P1. As shown in FIG. 1B, it has a symmetrical shape.

  As shown in FIGS. 1B and 1C, the main body 1 has a U-shaped cross section, and through holes 13 and 14 are formed in both end portions 1L and 1R. In the through holes 13 and 14, a support pin shown in FIG. 1D described later is rotatably supported. In the main body 1, a connecting portion between the inner peripheral portion 12 and one side surface 15 is formed by a curved surface 151 having a predetermined curvature.

As shown in FIG. 1D, the connecting portion 2 has a connecting shaft 21 and a support pin 22. The connecting shaft 21 has a left-hand threaded portion 211 formed with a left-handed male screw at one end 21L (left side in the figure), and a right-handed male thread is formed at the other end 21R (right-hand side in the figure). The right screw portion 212 is provided. Further, a boundary portion 210 between the left screw portion 211 and the right screw portion 212 has a hand turning portion 213 having a diameter larger than that of the shaft 21. The hand turning portion 213 has a lattice-like groove formed on the surface thereof, so that the hand does not slip when the hand turning portion 213 is rotated. As shown in FIG. 1A, the hand turning portion 213 is formed so as not to contact the rotor Ro to which the main body portion 1 and the axial direction movement preventing member A are attached.

  The support pin 22 shown in FIG. 1 (D) has a cylindrical shape, and has a right-handed screw pin 22R having a right-handed female screw 222 and a left-handed screw pin 22L having a left-handed female screw 223 at the center 221. is doing. The right screw portion 212 of the connecting shaft 21 is screwed with the female screw 222 of the right screw pin 22R, and the left screw portion 21 of the connecting shaft 21 is screwed with the female screw 223 of the left screw pin 22L. The right screw pin 22R is rotatably fitted in the through hole 13 of the left end 1L of the main body 1, and the left screw pin 22L is rotatably fitted in the through hole 14 of the right end 1R of the main body 1. . The support pins 22R and 22L are provided with an engagement hole 224 in which a hexagon wrench can be engaged. By engaging and rotating the hexagon wrench in the engagement hole 224, the direction of the female screws 222 and 223 can be changed in a direction in which the female shaft 222 and the connection shaft 21 can be screwed together.

2A, 2B, and 2C are schematic views for attaching the axial movement preventing member to the columnar member. As shown in FIG. 2A, the support pins 22R and 22L and the support pins 22R and 22L attached to both sides of the connection shaft 21 are rotated by rotating the hand turning portion 213 of the connection shaft 21 from the front upper side to the lower side. The main body parts 1 that are supported are moved so as to approach each other. Further, as shown in FIG. 2B, the main body 1 is moved away from each other by rotating the hand-turning portion 213 from the opposite side (from the front lower side to the upper side).

FIG. 2C shows a schematic diagram when the connecting portion rotates. As shown in FIG. 2, when the axial movement preventing member A is attached to the small cylindrical portion PL1, the connecting shaft 212 connected to the connecting pin 22R tilts toward the inner peripheral side, and the adjacent axial movement preventing member A The distance S1 with the connecting pin 22L is short. Moreover, when attaching to the large cylindrical part PL2, the connecting shaft 212 connected to the connecting pin 22L rotates around the connecting pin 22L as compared to the case of attaching to the cylindrical part PL1. Further, the distance S2 between the adjacent axial movement preventing member A and the connecting pin 22R is long.

Next, what is attached to the outer peripheral surface of a steam turbine rotor using a plurality of axial movement preventing members according to the present invention will be described.

FIG. 3 shows an example of what is attached to the outer peripheral surface of the steam turbine rotor using eight axial direction movement preventing members. The steam turbine ST is the same as the conventional steam turbine shown in FIG. 6 with blades attached, and the same parts are denoted by the same symbols. Here, the axial movement preventing member A is disposed between the roller rotator Rm and the bowl-shaped portion F to prevent direct contact between the roller Rr or the housing Rh and the bowl-shaped portion F.

As shown in FIG. 3, the axial direction movement prevention member A is attached to the rotor Ro of the steam turbine ST and tightened. After the axial movement preventing members A are arranged at equal central angular intervals on the outer peripheral surface Ro1 of the rotor Ro, the hand movement portions 213 of the respective connecting shafts 21 are rotated so that the main body portions 1 come close to each other, thereby preventing the axial movement preventing members. The circumference formed by A is reduced. Thereafter, the inner peripheral portion 12 of the main body 1 is disposed so as to contact the rotor Ro, and the connecting shaft 21 is further rotated to fasten and fix the rotor Ro with the axial movement preventing member A.

FIG. 4 shows an enlarged view of the bearing portion of the turbine rotor to which the axial movement preventing member is attached.

As shown in FIG. 4, the axial movement preventing member A attached to the bearing portion Ju of the turbine rotor Ro of the steam turbine ST rotates the hook-shaped portion F and the turbine rotor Ro provided at the end of the bearing portion Ju. The roller Rr is disposed between the roller Rr and the housing Rh to which the roller Rr is attached.

The inner peripheral surface 12 and the side surface 15 of the axial movement preventing member A are in contact with the flange portion F and the rotor Ro. The opposite side surface 16 is in contact with the housing Rh of the roller rotating machine Rm. When the turbine rotor Ro forms the bowl-shaped portion F, a curved surface Rf is formed on the rotor Ro and the bowl-shaped portion F. The curvature of the curved surface Rf is smaller than the curvature of the connecting portion 151 formed in the curved shape of the inner peripheral surface 12 and the side surface 15 of the axial movement preventing member A, and the curved surface Rf is the axial movement preventing member. There is no contact with A.

The axial movement preventing member A is in contact with the flange portion F and the rotor Ro at the small portions 120 and 150, respectively, and the frictional force is small. On the other hand, the axial direction movement preventing member A and the roller housing Rh are in contact with each other on the side surface and have a large frictional force. That is, when the turbine rotor Ro is rotated by the roller rotator Rm, the axial movement preventing member A and the roller housing Rh are relatively stopped, but the rotor Ro and the bowl-shaped portion F are axially moved. The preventing member A rotates relative to the preventing member A. In other words, the axial movement preventing member A moves on the rotor Ro and the hook-like portion F.

In this case, the hardness of the rotor Ro and the flanged portion F is harder than the axial movement preventing member A, the axial movement preventing member A by moving is gradually worn. By doing so, it is possible to rotate the turbine rotor Ro with the roller rotator Rm without cutting the rotor Ro and the bowl-shaped portion F.

FIG. 5 shows an example in which an axial movement preventing member is attached to a turbine rotor having a diameter different from that in FIG.

The turbine rotor Ro shown in FIG. 5 has a larger diameter than that of the turbine rotor Ro shown in FIG. 3, and is attached to the outer peripheral portion using 16 axial movement preventing members A. Since the main body 1 and the connecting portion 2 are rotatably supported, even when the positional relationship between the adjacent axial movement preventing members A changes (the arrangement position changes due to the change in the outer diameter of the rotor), The matching axial movement preventing member A can be connected by the connecting member 2.

In the above embodiment, the example of preventing the axial movement when the turbine rotor of the steam turbine is rotated by the roller is described as an example, but the present invention is not limited to this, and the movement of the connecting shaft receiving the axial force is not limited thereto. It can be widely used for prevention.

A rotation limiting mechanism for limiting the rotation of the connecting portion may be attached after the axial movement preventing member is attached to the turbine rotor. It is also possible to provide a pin pop-out preventing member for preventing the support pin from popping out of the through hole.

The above-described axial movement preventing members are shown as having a connecting portion having a right-hand screw and a left-hand screw for every adjacent axial movement preventing member, but every two pieces are arranged. It may be arranged in. In addition, although the description has been made with reference to the connecting portion having a hand turning portion that can be turned with a bare hand, the connecting portion is not limited thereto, and may be a structure that is turned using a tool. Furthermore, the connection part may be provided with an anti-rotation member for fixing the adjacent main body parts in a state where they are close to a predetermined distance.

Further, the connecting portion of the above-described axial movement preventing member is exemplified by a so-called turnbuckle shape provided on one shaft of a right-handed screw and a left-handed screw. It is possible to widely adopt one that can bring the matching main body parts closer to each other or away from each other.

Fig. (A) is a front view of the axial movement preventing member according to the present invention, and Fig. (B) is a front view of the main body portion of the axial movement preventing member shown in Fig. (A). It is sectional drawing of the main-body part shown to a figure (B), and is a disassembled front view of the connection part concerning this invention in a figure (D). Drawing (A), (B), and (C) are schematic diagrams which attach an axial direction movement prevention member to a cylindrical member. It is the schematic which shows an example of what is attached to the outer peripheral surface of a steam turbine using eight axial direction movement prevention members concerning this invention. It is an expanded sectional view of the bearing part of the turbine rotor which attached the axial direction movement prevention member concerning the present invention. It is the schematic which shows an example which attaches the axial direction movement prevention member concerning this invention to the turbine rotor of a diameter different from FIG. Fig. (A) is a front view of an example of attaching a moving blade to a turbine rotor, and Fig. (B) is an enlarged view of a bearing portion.

Explanation of symbols

A Axial direction movement prevention member 1 Body portion 11 Outer peripheral surface 12 Inner peripheral surface 2 Connecting portion 21 Connecting shaft 211 Left screw portion 212 Right screw portion 213 Handing portion 22 Support pin 22R Right screw pin 22L Left screw pin ST Steam turbine Ro Turbine rotor Rm Roller rotator Rr Roller Rh Roller housing F Bowl-shaped part CP Coupling Pr Rotor blade

Claims (8)

An axial movement preventing member that is attached to the outer peripheral surface of a columnar rotating body having a circular cross section and that prevents the columnar rotating body from moving in the axial direction in contact with the flange-shaped protruding portion provided on the columnar rotating body. There,
The main body,
A connecting portion that connects the adjacent main body portions;
The plurality of main body portions are connected in a ring shape at the plurality of connection portions,
The connecting part is rotatably engaged with the main body part, and at least one of the connecting parts can reduce or widen a gap between adjacent main body parts,
An axial movement preventing member that can be fixed to the outer peripheral surface of a columnar rotating body having different outer diameters by appropriately determining the number of the main body portion and the connecting portion. The connecting portion between the surface of the main body portion that contacts the outer peripheral portion of the rotating body and the surface that contacts the flange-like protruding portion of the columnar rotating body is formed of a curved surface. Axial movement prevention member. The connecting part that can reduce and widen the gap between the main body parts,
A right-handed screw pin rotatably supported at one end of the main body and having a right-handed female screw part at the center or substantially the center;
A left-handed screw pin rotatably supported at the other end of the main body and having a female screw part of a left-handed screw at the center or substantially the center;
It has a connecting shaft that has a right-handed male screw on one end and a left-handed male screw on the other end.
The right screw pin and the left screw pin are attached to the main body portion, and the right screw pin and the left screw pin attached to the adjacent main body portion when the main body portions are arranged side by side are arranged adjacent to each other,
The male screw of the right screw of the connecting shaft is screwed with the female screw of the right screw pin, and the male screw of the left screw of the connecting shaft is screwed with the female screw of the left screw pin. The axial direction movement prevention member as described. The axial movement preventing member according to claim 3, further comprising a rotation preventing member for restricting rotation of the connecting shaft. The shaft according to any one of claims 1 to 4, wherein the main body portion is formed of a member having a lower strength than a material forming the columnar rotating body and the flange-like protruding portion. Directional movement prevention member. 6. The axial movement preventing member according to claim 5, wherein the connecting portion is formed of a member having a strength lower than that of the material forming the columnar rotating body and the flange-like protruding portion. The axial movement according to any one of claims 3 to 6, further comprising a pin removal prevention member that prevents the pin from coming off by being in contact with both ends of the pin. Prevention member.   An axial movement preventing member that is attached to the outer peripheral surface of a columnar rotating body having a circular cross section and that prevents the columnar rotating body from moving in the axial direction by coming into contact with a flange-shaped protruding portion provided in the columnar rotating body A method for attaching to a columnar rotating body,
  After disposing the axial movement preventing member on the outer peripheral surface of the columnar rotating body, the circumference formed by the axial movement preventing member is reduced, and the inner periphery of the axial direction moving preventing member is used as the columnar rotating body. A method of attaching an axial movement preventing member to a columnar rotating body, characterized in that the axial direction movement preventing member is fixed in contact with the shaft.

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