JP5675411B2 - Support structure for steam turning device - Google Patents

Description

  The present invention relates to a support structure for a steam turning device that is installed at a steam inlet of a steam turbine and turns the steam supplied from the outside of the passenger compartment so as to flow symmetrically in both axial directions of the passenger compartment. Is.

  As a support structure of the steam turning device installed at the steam inlet of the steam turbine and turning the steam supplied from the outside of the passenger compartment to flow symmetrically in both axial directions of the passenger compartment, for example, What was disclosed by the nonpatent literature 1 is known.

“Schematic diagram of low-pressure turbine steam turning device”, [searched on January 19, 2011], Internet <URL: http://www.yonden.co.jp/press/re1002/data/pr005-04.pdf>

FIG. 12 illustrates in more detail the steam turning device, the casing of the steam turbine, and the mounting structure described in Non-Patent Document 1.
As shown in FIG. 12, the support structure 100 of the conventional steam turning device includes a cradle that protrudes inward (radially inward) along the horizontal plane from the inner peripheral surface 101 a of the lower half 101 of the internal casing. On the upper surface of the (supporting base) 102, the lower surface of the horizontal flange 103 that protrudes outward (radially outward) along the horizontal plane from the lower half of the steam turning device is placed (supported) via the liner 104. ). The horizontal flange 103 is fixed to the cradle 102 with a stud bolt 108.

  In order to fix the nut 106 screwed to one end portion of the implantation bolt 108 to the implantation bolt 108 so that the nut 106 screwed to one end portion of the implantation bolt 108 does not rotate with respect to the implantation bolt 108. The nut 106 and the stud bolt 108 are provided with holes 111 and 112, respectively. The split pin 110 is inserted and attached to the holes 111 and 112.

  However, when the split pin structure as described above is employed, when the split pin 110 is attached to the nut 106 and the stud bolt 108 with play (play), the nut 106 rotates relative to the stud bolt 108. (Swinging), the split pin 110 slides in the holes 111 and 112, and the split pin 110 is thinned, so that the split pin 110 may be broken.

  The present invention has been made in view of such circumstances, and does not employ a split pin structure, and does not restrict the relative thermal expansion of the steam turning device with respect to the internal compartment, and thereby performs the steam turning. It is an object of the present invention to provide a support structure for a steam turning device that can support the device with respect to an internal compartment.

The present invention employs the following means in order to solve the above problems.
The support structure of the steam turning device according to the present invention is installed at the steam inlet portion of the steam turbine and turns the steam supplied from the outside of the passenger compartment so as to flow symmetrically in both the axial directions of the passenger compartment. steam diverter to, a supporting structure of a steam diverter for supporting relative to the inner casing that consists of a lower half inner casing and the inner casing upper half, of the inner casing lower half portion A pedestal extending along the horizontal plane and projecting radially inward from the inner peripheral surface, and projecting from the lower half of the steam turning device along the horizontal plane and radiating outward, and an upper surface of the cradle A horizontal flange on which the end is supported, and a convex portion fitted into a recess provided on the upper surface of the end of the horizontal flange at one end, and the lower half of the inner casing through a fixing member is fixed to the upper surface, the cradle and Comprising the the support sandwiching the horizontal flange also to a lower surface of the convex portion, the first gap is provided between the bottom surface forming the recess to the lower surface facing and the inner wheel A second gap is provided between the inner peripheral surface of the lower half of the chamber and the end surface of the end facing the inner peripheral surface.

According to the support structure of the steam turning device according to the present invention, only the bolt is used to fix (attach) the steam turning device to the lower half of the inner compartment, and the relative heat of the steam turning device with respect to the inner compartment. In order not to restrain the elongation, a first gap is provided between the lower surface of the convex portion and the bottom surface forming a recess facing the lower surface, and the inner peripheral surface of the lower half portion of the internal compartment, A second gap is provided between the inner peripheral surface and the end surface of the opposite end.
Accordingly, the steam turning device can be supported with respect to the inner casing without adopting the split pin structure and without restricting the relative thermal expansion of the steam turning device with respect to the inner casing.

  In the support structure of the steam turning device, it is more preferable that the end of the horizontal flange is placed on the upper surface of the liner fixed on the upper surface of the cradle via bolts.

According to such a support structure of the steam turning device, by adjusting the thickness of the liner, the first surface formed between the lower surface of the convex portion and the bottom surface forming a recess facing the lower surface. The gap will be adjusted.
As a result, it is not necessary to adjust the plate thickness at the end of the horizontal flange or the plate thickness of the cradle, and the first gap can be adjusted more efficiently.

  In the support structure for the steam turning device, it is more preferable that a recess for receiving and storing the bottom of the support is provided on the upper surface of the lower half of the inner casing.

According to such a support structure for the steam turning device, the height (distance) from the upper surface of the lower half of the inner compartment to the upper surface of the support can be kept low.
Thereby, the height dimension from the upper surface of a lower half part of an internal compartment to the upper surface of a support can be reduced.

  The steam turbine according to the present invention supports the steam turning device with respect to the inner casing without adopting the split pin structure and without restricting the relative thermal expansion of the steam turning device with respect to the inner casing. A support structure for the steam turning device.

  According to the steam turbine of the present invention, since the split pin is not thinned and the split pin is not broken, the reliability of the steam turbine can be improved.

Steam turbine according to the present invention and configured casing and a inner casing lower half portion and the inner casing upper half portion, a steam diverter housed inside the passenger compartment, the lower half of the steam diverter A horizontal flange that protrudes outward in the horizontal direction from the inner periphery, a cradle that supports the horizontal flange and protrudes inward in the horizontal direction from the inner peripheral surface of the lower half of the internal casing, and a lower member in the inner casing via a fixing member fixed, it overlies at least a portion of the upper surface of the horizontal flange through the first gap in the upper horizontal flange, and a support sandwiching a horizontal flange with the cradle, horizontal flanges, the lower half of the inner casing It faces the inner peripheral surface via the second gap.

  According to such a steam turbine, the first gap located between the lower surface of the support and the upper surface of the horizontal flange, and the second gap between the inner peripheral surface of the lower half of the inner casing and the horizontal flange, Thus, it is possible to restrain the movement in the vertical direction while allowing the horizontal flange to move in the horizontal direction. Such a steam turbine can be reliably fixed in the passenger compartment while allowing the steam turning device to extend its heat.

  According to the present invention, the steam turning device can be supported with respect to the inner casing without adopting the split pin structure and without restricting the relative thermal expansion of the steam turning device with respect to the inner casing. There is an effect that can be done.

It is a perspective view of the support structure of the steam turning apparatus which concerns on one Embodiment of this invention. It is a side view of the support structure of the steam turning apparatus which concerns on one Embodiment of this invention. It is a top view of the support structure of the steam turning apparatus which concerns on one Embodiment of this invention. FIG. 3 is a cross-sectional view of FIG. 2. It is a perspective view for demonstrating the procedure which fixes (attaches) a steam turning apparatus to an inner compartment lower half, Comprising: It is a figure which shows a 1st process. It is a perspective view for demonstrating the procedure which fixes (attaches) a steam turning apparatus to an inner compartment lower half, Comprising: It is a figure which shows a 2nd process. It is a perspective view for demonstrating the procedure which fixes a steam turning apparatus to an inner compartment lower half part (attachment), Comprising: It is a figure which shows a 3rd process. It is a perspective view for demonstrating the procedure which fixes (attaches) a steam turning apparatus to an inner compartment lower half, Comprising: It is a figure which shows a 4th process. It is a perspective view for demonstrating the procedure which fixes (attaches) a steam turning apparatus to an inner compartment lower half, Comprising: It is a figure which shows a 5th process. It is a perspective view for demonstrating the procedure which fixes (attaches) a steam turning apparatus to an inner compartment lower half, Comprising: It is a figure which shows a 6th process. It is sectional drawing of the steam turbine which concerns on one Embodiment of this invention. It is sectional drawing which shows the support structure of the conventional steam turning apparatus, Comprising: It is a figure similar to FIG.

Hereinafter, a support structure for a steam turning apparatus according to an embodiment of the present invention will be described with reference to FIGS. 1 to 11.
1 is a perspective view of a support structure for a steam turning apparatus according to the present embodiment, FIG. 2 is a side view of the support structure for the steam turning apparatus according to the present embodiment, and FIG. 3 is a support structure for the steam turning apparatus according to the present embodiment. FIG. 4 is a cross-sectional view of FIG. 2, and FIG. 5 is a perspective view for explaining a procedure for fixing (attaching) the steam turning device to the lower half of the internal compartment, showing the first step. FIG. 6 is a perspective view for explaining a procedure for fixing (attaching) the steam turning device to the lower half of the inner compartment, and shows a second step, and FIG. 7 shows the steam turning device under the inner compartment. FIG. 8 is a perspective view for explaining a procedure for fixing (attaching) to the half part, showing a third step, and FIG. 8 explaining a procedure for fixing (attaching) the steam turning device to the lower half part of the internal compartment. FIG. 9 is a perspective view for showing the fourth step, and FIG. 9 shows the steam turning device in the lower half of the internal compartment. FIG. 10 is a perspective view for explaining a procedure for fixing (attaching), showing the fifth step, and FIG. 10 is a perspective view for explaining a procedure for fixing (attaching) the steam turning device to the lower half of the internal compartment. FIG. 11 is a diagram showing a sixth step, and FIG. 11 is a cross-sectional view of the steam turbine according to the present embodiment.

  The steam turbine of this embodiment is used for a thermal power generation turbine, a nuclear power generation turbine, and the like, for example. As shown in FIG. 11, an internal casing is provided inside a casing 6 of the steam turbine 10, and the internal casing is divided into an upper half (not shown) of the inner casing and a lower half 6a of the inner casing. Goodbye The steam turning device support structure 1 is installed at a steam inlet (not shown) of a steam turbine so that steam supplied from the outside of the passenger compartment 6 flows symmetrically in both the axial directions of the passenger compartment. The steam turning device 7 for turning is supported with respect to the internal compartment constituting the compartment 6.

As shown in at least one of FIGS. 1 to 4, a support structure 1 for a steam turning apparatus according to this embodiment includes a cradle (support pedestal) 2, a liner 3, a horizontal flange 4, and a support 5. And.
The cradle 2 protrudes from the inner peripheral surface 11a of the lower half 11 of the internal compartment along the horizontal plane and inward (radially inward), and has a rectangular shape in a top view (bottom view) and a rectangular shape in a side view. It is a rectangular parallelepiped member which exhibits a rectangular shape in front view. The upper surface 2a and the lower surface 2b of the cradle 2 are communicated with each other at the center in the length direction (left and right direction in FIG. 4) and width direction (vertical direction in FIG. 3) of the cradle 2 in the plate thickness direction (FIG. 4). (First) through-hole 12 penetrating in the vertical direction is provided. On the inner peripheral surface of the through hole 12, a female screw portion (not shown) that engages with a male screw portion (not shown) provided on the outer peripheral surface of a shaft portion of a bolt 13 with a (first) hexagonal hole described later. ) Is provided.

  Further, at the center in the width direction of the cradle 2 and at the center in the upper half of the plate thickness direction, from the front surface 2c of the cradle 2 along the horizontal plane and outward (radially outward). A (first) hole 14 is drilled. In the hole 14, a set screw 15 that functions as a detent (loosening prevention) for the hexagon socket head cap screw 13 is fitted (inserted).

  The liner 3 adjusts a (first) gap G1 formed between the lower surface 5a of the support 5 and the bottom surface 16a forming the recess 16 of the horizontal flange 4, and has a rectangular shape when viewed from the top (bottom view). A rectangular parallelepiped member that exhibits a rectangular shape in side view and a rectangular shape in front view. The central portion of the liner 3 in the length direction (left and right direction in FIG. 4) and width direction (direction perpendicular to the paper surface in FIG. 4) communicates with the upper surface 3a and the lower surface 3b of the liner 3 in the thickness direction (FIG. 4 (up and down direction), and a (second) through hole 21 that receives and accommodates the head of the hexagon socket head bolt 13 and the upper end of the shaft is provided. The upper surface 3a of the liner 3 is formed so as to be in contact with the lower surface 22a that forms the end 22 when the end 22 of the horizontal flange 4 is placed thereon, and the lower surface 3b of the liner 3 is It is formed so as to come into contact with the upper surface 2 a of the cradle 2 when placed on the pedestal 2.

The horizontal flange 4 is a member that protrudes from the lower half of the steam turning device 7 along the horizontal plane and outward (radially outward), and a main body portion 23 located on the steam turning device side, and the steam turning. It is provided with an end 22 located on the side opposite to the device, that is, on the side of the lower half 11 of the internal compartment.
The main body 23 is a rectangular parallelepiped member that has a rectangular shape in a top view (bottom view), a rectangular shape in a side view, and a rectangular shape in a front view, and includes an upper surface 23a and a lower surface 23b extending along a horizontal plane.

  The end 22 is a block-like member having a concave shape in a top view, a rectangular shape in a side view, and a concave shape in a front view, and includes an upper surface 22b and a lower surface 22a extending along a horizontal plane. The upper surface 22b is formed on the same plane as the upper surface 23a of the main body 23, and the lower surface 22a is positioned on a horizontal plane located above the horizontal plane on which the lower surface 23b of the main body 23 is positioned. That is, the lower surface 22a and the lower surface 23b of the main body 23 are connected via the wall surface 24 extending along the vertical surface.

Further, a support 5 is provided at the center of the left half (and the right half) in the length direction (left and right direction in FIG. 4) of the end portion 22 and in the width direction (direction perpendicular to the paper surface in FIG. 4). A rectangular parallelepiped (first) recess 16 having a rectangular shape in a top view, a rectangular shape in a sectional view, and a rectangular shape in a front view is provided. The recess 16 is formed by a bottom surface 16a and three side surfaces 16b so that the upper side and the side of the lower half portion 11 of the internal casing are open.
Furthermore, between the (front) end surface (surface facing the inner peripheral surface 11a of the inner casing lower half 11) 22c and the inner peripheral surface 11a of the inner casing lower half 11 (first) 2) gap G2 is formed.

  The support 5 is a block-like member that prevents the horizontal flange 4 from slipping upward and has a convex shape in a top view (bottom view), a rectangular shape in a side view, and a rectangular shape in a front view. At the center of the support 5 in the width direction (vertical direction in FIG. 3) and on the steam turning device 7 side, the upper surface 5b and the lower surface 5a of the support 5 communicate with each other in the thickness direction (vertical direction in FIG. 4). ) And a (third) through-hole 32 that receives and accommodates the head of the hexagon socket head cap bolt 31 and the upper half of the shaft portion.

  Further, when the support 5 is set (positioned) in the recess 33 formed in the upper surface 11b of the inner casing lower half 11, the lower half of the shaft portion of the hexagon socket head cap bolt 31 is received and accommodated. A (second) hole 34 is drilled from the bottom surface 33a forming the (second) recess 33 along the vertical plane and downward. The inner peripheral surface of the hole 34 is provided with a female screw portion (not shown) that is screwed with a male screw portion (not shown) provided on the outer peripheral surface of the shaft portion of the hexagon socket head cap bolt 31.

  At the center of the support 5 in the width direction (vertical direction in FIG. 3) and on the side opposite to the steam turning device 7, the upper surface 5b and the lower surface 5a of the support 5 are communicated with each other in the thickness direction (in FIG. 4). A (fourth) through-hole 35 is provided which penetrates in the vertical direction and receives and accommodates a push-up bolt (not shown) used when removing the support 5. On the inner peripheral surface of the through hole 35, a female screw portion (not shown) that is screwed with a male screw portion (not shown) provided on the outer peripheral surface of the shaft portion of the push-up bolt is provided.

  The lower surface 5a of the support 5 is formed so as to contact the bottom surface 33a when placed on the bottom surface 33a forming the recess 33. Further, as shown in FIG. 3, the liner 3 is set (positioned) on the cradle 2, the horizontal flange 4 is set on the liner 3, and the support 5 is set on the bottom surface 33 a of the recess 33. When this is done, a (third) gap G3 is formed between the two side surfaces 41a forming the convex portions 41 of the support 5 and the side surfaces 16b facing the side surfaces 41a and forming the recesses 16 respectively. A (fourth) gap G4 is formed between the (front) end surface 41b that forms the convex portion 41 of the support 5 and the side surface 16b that forms the recess 16 facing the end surface 41b. Yes.

Next, a procedure for fixing (attaching) the steam turning device 7 to the lower half 11 of the internal casing will be described with reference to FIGS.
First, as shown in FIG. 5, a recess 33 is formed on the upper surface 11 b of the lower half 11 of the internal compartment, a hole 34 is formed on the bottom surface 33 a of the recess 33, and a through hole 12 is formed on the upper surface 2 a of the cradle 2. The hole 14 is processed in the front surface 2c of No. 2, and the first step is completed.

Next, as shown in FIG. 6, a gap G <b> 1 (see FIG. 4) between the lower surface 5 a (see FIG. 4) of the support 5 and the bottom surface 16 a (see FIG. 4) that forms the recess 16 of the horizontal flange 4. Is placed on the upper surface 2a of the cradle 2 (see FIG. 4), and the second step is completed.
Next, as shown in FIG. 7, the hexagon socket head bolt 13 is inserted into the through hole 21, and the male screw portion (not shown) provided on the outer peripheral surface of the shaft portion of the hexagon socket head bolt 13 is inserted into the through hole. 12 is threadedly engaged with a female screw portion (not shown) provided on the inner peripheral surface, and the hexagon socket head bolt 13 is tightened with respect to the through hole 12, and the set screw 15 is provided with the hole 14 and the hexagon socket. It inserts in the (fifth) through-hole 13a (refer FIG. 4) drilled in the axial part of the volt | bolt 13, and complete | finishes a 3rd process.

Next, as shown in FIG. 8, a gap G2 (see FIG. 4) is formed between the end surface 22c (see FIG. 4) of the end portion 22 and the inner peripheral surface 11a (see FIG. 4) of the lower half 11 of the internal compartment. ) Is placed on the upper surface 3a of the liner 3 to finish the fourth step.
Subsequently, as shown in FIG. 9, two side surfaces 41a (see FIG. 3) that form the convex portions 41 of the support 5, and a side surface 16b (see FIG. 3) that forms the recesses 16 facing these side surfaces 41a. A gap G3 (see FIG. 3) is formed between the end face 41b (see FIG. 3) forming the convex portion 41 of the support 5, and a side face 16b (see FIG. 3) forming the recess 16 opposite to the end face 41b. 3), the support 5 with the width and length of the convex portion 41 adjusted so that a gap G4 is formed is placed on the bottom surface 33a of the recess 33 (see FIG. 8), and the fifth The process ends.

  Then, as shown in FIG. 10, the hexagon socket head bolt 31 is inserted into the through hole 32, and the male screw portion (not shown) provided on the outer peripheral surface of the shaft portion of the hexagon socket head bolt 31 is inserted into the hole 34. The hexagon socket head cap bolt 31 is tightened with respect to the hole 34 by screwing with a female screw portion (not shown) provided on the inner peripheral surface, and the sixth step is completed.

According to the steam turning device support structure 1 according to the present embodiment, only the hexagon socket head cap bolt 31 is used to fix (attach) the steam turning device 7 to the lower half 11 of the internal casing, A (first) gap G1 is provided between the lower surface 5a of the convex portion 41 and the bottom surface 16a that forms the recess 16 facing the lower surface 5a so as not to restrain the relative thermal expansion of the steam turning device. In addition, a (second) gap G2 is provided between the inner peripheral surface 11a of the lower half portion 11 of the internal casing and the end surface 22c of the end 22 facing the inner peripheral surface 11a.
Accordingly, the steam turning device can be supported with respect to the inner casing without adopting the split pin structure and without restricting the relative thermal expansion of the steam turning device with respect to the inner casing.

Moreover, according to the support structure 1 of the steam turning apparatus according to the present embodiment, the lower surface 5a of the support 5 (more specifically, the convex portion 41) is opposed to the lower surface 5a by adjusting the plate thickness of the liner 3. The gap G1 formed between the bottom surface 16a that forms the recess 16 is adjusted.
Thereby, it is not necessary to adjust the plate thickness at the end 22 of the horizontal flange 4 or the plate thickness of the cradle 2, and the adjustment work of the gap G <b> 1 can be performed more efficiently.

Furthermore, according to the support structure 1 of the steam turning apparatus according to the present embodiment, the height (distance) from the upper surface 11b of the lower half 11 of the internal compartment to the upper surface 5b of the support 5 is suppressed by the recess 33. It will be.
Thereby, the height dimension from the upper surface 11b of the lower half part 11 of the internal compartment to the upper surface 5b of the support 5 can be reduced.

According to the steam turbine 10 of the present invention, the steam turning device can be attached to the inner casing without adopting the split pin structure and without restricting the relative thermal expansion of the steam turning device with respect to the inner casing. Therefore, the split pin 110 (see FIG. 11) is not thinned and the split pin 110 is not broken. The reliability of the steam turbine can be improved.

  Note that the present invention is not limited to the above-described embodiment, and can be modified and changed as necessary.

DESCRIPTION OF SYMBOLS 1 Support structure of steam turning apparatus 2 Base 2a Upper surface 3 Liner 3a Upper surface 4 Horizontal flange 5 Support 5a Lower surface 6 Casing 7 Steam turning apparatus 10 Steam turbine 11 Inner casing lower half 11a Inner peripheral surface 11b Upper surface 13 With hexagonal hole Bolt 16 Recess 16a Bottom 22 End 22b Top 22c End 31 Hexagon socket head bolt 33 Recess 41 Protrusion G1 (first) gap G2 (second) gap

Claims (5)

A steam turning device installed at the steam inlet of the steam turbine and turning the steam supplied from the outside of the passenger compartment so as to flow symmetrically in both axial directions of the passenger compartment. a support structure of a steam diverter for supporting relative to the inner casing that consists of an inner casing upper half portion and,
From the inner peripheral surface of the lower half of the internal compartment, a cradle that extends along the horizontal plane and radially inward ,
From the lower half of the steam turning device, along the horizontal plane and projecting radially outward , a horizontal flange whose end is supported by the upper surface of the cradle,
The one end portion has a convex portion that fits into a recess provided on the upper surface of the end portion of the horizontal flange, and is fixed to the upper surface of the lower half of the inner casing through a fixing member, and the horizontal portion together with the cradle And a support for sandwiching the flange ,
A first gap is provided between a lower surface of the convex portion and a bottom surface forming the recess facing the lower surface, and an inner peripheral surface of the lower half of the inner casing, and the inner peripheral surface A structure for supporting a steam turning device, wherein a second gap is provided between the first end portion and the end face of the end portion facing each other.   2. The support structure for a steam turning apparatus according to claim 1, wherein an end of the horizontal flange is placed on an upper surface of a liner fixed via bolts on the upper surface of the cradle.   The support structure for a steam turning device according to claim 1 or 2, wherein a recess for receiving and storing the bottom of the support is provided on the upper surface of the lower half of the internal casing.   A steam turbine comprising the support structure for the steam turning device according to any one of claims 1 to 3. A steam turbine casing composed of a lower half of the inner casing and an upper half of the inner casing ;
A steam turning device housed inside the vehicle compartment;
A horizontal flange protruding outward in the horizontal direction from the lower half of the steam turning device;
A cradle that supports the horizontal flange and protrudes inward in the horizontal direction from the inner peripheral surface of the lower half of the internal casing;
It is fixed to the lower half of the internal casing via a fixing member , covers at least part of the upper surface of the horizontal flange via a first gap above the horizontal flange, and sandwiches the horizontal flange together with the cradle and a comb support,
The said horizontal flange is a steam turbine which opposes the internal peripheral surface of the said internal casing lower half part via a 2nd clearance gap.

Images