JPH1077803A - Eccentric pin for positioning turbine blade ring - Google Patents

Abstract

PROBLEM TO BE SOLVED: To dispense with machining for adjustment to actual goods and dispense with remaking in case of needing to readjust the eccentric quantity by forming a head of an eccentric pin in such angular pillar shape with even- numbered angles that midpoints between opposed parallel side faces are eccentric from the center of a cylindrical body part, respectively with different eccentric quantity from one another. SOLUTION: An eccentric pin 7 is provided with a cylindrical body part 7a and a head 7b provided at the upper part of the body part 7a and formed in such a way that midpoints between opposed parallel side faces have respectively different eccentric quantity α, β, γ, δ from the center of the body part 7a. After temporary assembly of turbine casings 1, 2 and blade rings 3, 4, the eccentric quantity of the blade rings 3, 4 from the turbine casings 1, 2 are measured. After measuring the eccentric quantity, the eccentric pin 7 is rotated according to the eccentric quantity so as to be able to position the blade rings. Machining for adjustment of the eccentric pin 7 is therefore dispensed with, and even in case of needing to reset blade ring positions, resetting can be performed only by rotating the eccentric pin 7, so that the eccentric pin 7 does not have to be remade.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an eccentric pin for positioning a turbine blade ring applied to a steam turbine.

[0002]

2. Description of the Related Art FIG.
The rotor 5 which is a rotating part of the turbine and the upper and lower blade rings 3 and 4 which are stationary parts shown in (a) need to maintain a specified clearance 6 in a horizontal direction orthogonal to the rotor axis.

In order to set the clearance 6 to a specified value, when the upper and lower blade rings 3 and 4 are mounted, the clearance between the upper and lower casings 1 and 2 and the rotor 5 which have already been positioned is adjusted. It is necessary to adjust the relative position in the horizontal direction perpendicular to the rotor axis.

In the conventional positioning adjustment of the turbine blade ring, the eccentricity between the blade rings 3 and 4 and the casings 1 and 2 is different for each of the blade rings 3 and 4. , 4 and the rotor 5 are temporarily assembled to measure the amount of eccentricity for each blade ring.

Next, as shown in FIGS. 1B and 1C, an eccentric pin 07 provided with a cylindrical main body 07a and a head 07b having a notch is manufactured, and is shown in FIG. The main body 07a of the eccentric pin 07 is inserted into the holes 07c provided at the upper and lower ends of the vehicle compartments 1 and 2, respectively, and the head 07b is provided at the holes 07d provided at the upper and lower ends of the wing rings 3 and 4, respectively. The positioning adjustment has been performed by fitting into the.

The positioning of the blade rings 3 and 4 in the rotor axis direction is performed by adjusting the convex portions 8 provided on the inner peripheral surfaces of the vehicle cabins 1 and 2 and the outer peripheral surfaces of the blade rings 3 and 4 shown in FIG. This is performed by fitting the concave portion 9 provided in the first portion.

[0007]

In the conventional eccentric pin used for adjusting the positioning of the turbine blade ring, only one eccentric amount is given by the adjustment processing, so that when the clearance needs to be readjusted on site. Had to remake the eccentric pin itself.

This eccentric pin is used for each blade ring, and a large number of eccentric pins are required for one turbine. Therefore, it takes a lot of time to adjust and remake the eccentric pin. The present invention seeks to solve the above problems.

[0009]

An eccentric pin for positioning a turbine blade ring according to the first aspect of the present invention is provided on a blade ring with a main body fitted into a circular hole provided in a vehicle compartment. In the eccentric pin used for positioning in the horizontal direction perpendicular to the rotor axis of the blade ring, the head is inserted into the long hole in the rotor axis direction,
The main body is formed in a columnar shape, and the head has a center point between the opposing parallel side faces eccentric with respect to the center of the main body part, and the eccentric amounts of the respective middle points are different from each other. It is characterized by being formed.

In the present invention, when positioning the turbine blade ring, an eccentric pin is manufactured in advance, and the casing, the blade ring, and the rotor are temporarily assembled, and the horizontal direction perpendicular to the rotor axis of the blade ring is first set. Measure the amount of eccentricity with respect to the cabin.

After measuring the amount of eccentricity, the temporary assembly is disassembled, the eccentric pin is inserted into a hole in the vehicle compartment, the eccentric pin is rotated in this hole, and the eccentricity of the center of the eccentric pin with respect to the center of the main body of the eccentric pin is measured. After the side of the head whose amount coincides with the measured eccentricity is set to the direction of the rotor axis, the main body of the eccentric pin is fitted into the hole of the vehicle compartment, and the head is inserted into the elongated hole of the blade ring. Install the wing ring in the cabin.

Therefore, there is no need to adjust the eccentric pin according to the actual product, which simplifies the positioning operation and eliminates the need to re-create the eccentric pin when the amount of eccentricity needs to be readjusted.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An eccentric pin for positioning a turbine blade ring according to an embodiment of the present invention will be described with reference to FIG.

An eccentric pin 7 according to this embodiment shown in FIG.
Is that the midpoint between the cylindrical main body 7a and the opposing parallel side surface provided on the upper end thereof is eccentric with respect to the center of the main body 7a, and the eccentric amounts α, β, γ, δ of the respective midpoints Are provided with a head 7b which is different from each other and formed in an octagonal column shape.

In the positioning of the turbine blade ring using the eccentric pin according to the present embodiment, in advance, as in the prior art,
As shown in FIG. 1 (c), holes 7c for inserting the main body 7a of the eccentric pin 7 are formed at the upper and lower ends of the upper and lower casings 1 and 2, respectively. A hole 7d for fitting the head 7b is formed. Also, a predetermined number of the eccentric pins 7 having the octagonal column shape with the head 7b are manufactured.

Next, the passenger compartments 1 and 2, the blade rings 3 and 4, and the rotor 5
After the eccentric amount of the blade rings 3 and 4 with respect to the vehicle compartments 1 and 2 is measured, the rotor 5 and the blade rings 3 and 4 are removed, and the main body 7a of the eccentric pin 7 is inserted into the hole 7c of the vehicle room 2. insert.

The eccentric pin 7 having the main body 7a inserted into the hole 7c of the casing 2 has a head 7b whose eccentricity at the center between the center of the main body 7a and the above measured eccentricity.
The main body 7a is inserted into the hole 7c of the vehicle compartment 2 after the inside of the hole 7c is rotated so that the side surface becomes parallel to the rotor axis. In this state, the head 7 of the eccentric pin 7 is inserted into the hole 7d of the blade ring 4.
The wing ring 4 is attached to the vehicle compartment 2 while inserting b.

Next, the blade ring 3 is attached to the blade ring 4, and finally the eccentric pin 7 is inserted into the hole 7c of the vehicle compartment 1 from above.
In the same manner as described above, the main body 7a of the eccentric pin 7 is inserted into the hole 7c of the vehicle cabin 1 with the side surface where the amount of eccentricity at the midpoint coincides with the measured eccentric amount is inserted into the hole 7c of the casing 1, The head 7b of the eccentric pin 7 is fitted to the
4 is completed.

In this embodiment, after measuring the amount of eccentricity between the blade ring and the cabin, the position of the blade ring can be determined only by rotating the eccentric pin in accordance with the amount of eccentricity. No longer needed.

Further, even if it is necessary to reset the position of the blade ring for some reason after positioning once, there is no need to recreate the eccentric pin, and it is possible to reset it by simply rotating it. became.

Since the amount of eccentricity given to the eccentric pin is a very small value, it is difficult for the naked eye to recognize the amount of eccentricity. To facilitate selection of the amount of eccentricity, the amount of eccentricity should be marked on each side surface. .

In the present embodiment, the head of the eccentric pin has an octagonal prism shape. However, in consideration of the variation in the amount of eccentricity after measurement and the surface pressure, an appropriate surface such as a square, hexagon, or octagon is used. Choose a number.

[0023]

According to the eccentric pin for positioning the turbine blade ring of the present invention, the main body of the eccentric pin fitted into the circular hole of the vehicle compartment is formed in a columnar shape and inserted into the elongated hole of the blade ring. The head has a midpoint between the opposing parallel side faces eccentric to the center of the main body, and the eccentricity of each midpoint is different from each other. The eccentric pin does not need to be adjusted according to the actual product, which simplifies the positioning work.
When the eccentric amount needs to be readjusted, it is not necessary to remake the eccentric pin.

[Brief description of the drawings]

FIG. 1 is an explanatory view of an eccentric pin for positioning a turbine blade ring according to an embodiment of the present invention, where (a) is a side view and (b)
FIG. 3A is a view taken along the line AA in FIG. 4A, and FIG.

2A and 2B are explanatory views of a conventional eccentric pin, wherein FIG. 2A is an explanatory view of a state where a blade ring is attached to a vehicle compartment, FIG. 2B is a view taken along the line BB of FIG. 2A, and FIG. FIG. 2B is a view taken along the line DD, and FIG.
FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Upper casing 2 Lower casing 3 Wing ring (upper) 4 Wing ring (lower) 5 Rotor 6 Clearance 7 Eccentric pin 7a Main part 7b Head 7c Hole in cabin 7d Hole in wing ring

Claims (1)

[Claims] 1. A main body portion is fitted into a circular hole provided in a vehicle compartment, and a head is inserted into a long hole in a rotor axial direction provided on a blade ring, and a head is inserted in a horizontal direction orthogonal to a rotor axis of the blade ring. In the eccentric pin used for positioning, the main body is formed in a cylindrical shape,
A turbine, wherein a midpoint between opposing parallel side surfaces is eccentric with respect to the center of the main body, and the eccentric amounts of the respective midpoints are different from each other and are formed in a plurality of even-angled prisms. Eccentric pin for positioning the blade ring.