JP4504500B2 - Flange joint surface adjustment device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a flange joint surface adjustment device, and is mainly used to prevent one-side tightening when a gasket is assembled between flange joints in a fuel pipe of a gas turbine.
[0002]
[Prior art]
Conventionally, in a thermal power plant, fuel pipes of gas turbines, which are important components, are regularly removed and regularly inspected, serviced, or replaced. After that, when assembling equipment and piping in this type of piping system, the gaskets used for many years are replaced with new gaskets.
[0003]
In that case, a gasket is fitted between the flange joints for piping, that is, the gap between the opposing flange faces (hereinafter referred to as the face-to-face), and the other flange joint is connected to the flange joint on the base side with bolts and nuts. In order to fix the gasket, the thickness of the flange joint is taken into consideration so as not to be tightened, and the space between the flange joints is gradually tightened and fixed while measuring with a caliper. It is kept in close contact with the surface pressure.
[0004]
[Problems to be solved by the invention]
However, when the work location is a fuel pipe of a gas turbine, many of the locations are narrow and the piping system is complicated, so it takes a lot of trouble to tighten the work while measuring the space between the flange joints with calipers. The measurement and tightening work requires considerable skill.
Moreover, since such a part reaches about 100 places for every periodic inspection, a great amount of work time is spent.
[0005]
[Means for Solving the Problems]
Therefore, in the present invention, as described in claim 1, a pair of left and right clamp fittings are fitted into and supported by a flange joint, and the clamp fitting is inclined downward in the radial direction of the flange joint. A slope groove is formed, and a slide gauge is fitted into the slope groove, and the slide gauge is formed from a cradle part and a press platen part. Among them, the upper part of the cradle part is formed in a horizontal plane and the stopper projection protrudes. The bottom part of the cradle part is formed on an inclined surface with the same downward slope as the slope groove of the clamp fitting, and an operating member that moves the slide gauge along the slope groove is attached to the push plate part. A flange joint surface adjustment device is provided.
[0006]
A flange joint surface adjusting device according to claim 1 is an apparatus for adjusting a flange joint surface according to claim 1, wherein an operating member of a slide gauge is screwed into a screw hole formed in a clamp fitting, and It is composed of an inserted shaft portion, a collar portion formed on the shaft portion, and a shaft head formed on the rear end of the shaft portion, and the shaft head is used as an operation knob or a bolt head. .
[0007]
In addition, a third aspect of the present invention is the flange joint inter-face adjustment device according to the first aspect, wherein a clamp fitting to be fitted into the flange joint is formed from each part of the outer frame ring, the upper plate, and the lower plate. An inner half arc edge formed by cutting the inner center of the upper plate into a substantially semicircular shape, and the center of the slope groove at the intersection of the front and rear ends of the inner half arc edge and the inner edge of the upper plate. The concentric position of the inner end of the line is cut off in the tangential direction or slightly in an arc shape, and the cut-off edge is used as a positioning edge for centering the gasket fitted into the center between the surfaces of the flange joint.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, as shown in FIG. 1, the flange joints F1 and F2 between-surface adjusting device M1 are formed with a pair of left and right clamp metal fittings 1L and 1R, and a slide gauge and its operation handle fitted into the inclined groove. FIG. 2 is a perspective view, a plan view showing a state in which the clamp fittings 1L and 1R are assembled to the flange joint as shown in FIG. 2, and a clamp fitting between the flange joint faces as shown in FIG. FIG. 2 is a sectional view taken along the line XX in FIG. 2, and an exploded perspective view of the slide gauge S and its operation handle H incorporated in the inclined grooves of the clamp fittings 1L and 1R as shown in FIG. A description will be given based on a cross-sectional view of main parts of the slide gauge S and its operation handle H and the like assembled in the inclined grooves of the clamp fittings 1L and 1R as shown in FIG.
[0013]
First, 1L and 1R are a pair of left and right clamp fittings that sandwich and support the flange joint F1 on the base side, and a recess 2 that fits into the flange portion of the flange joint F1 is formed on the inner side thereof.
Specifically, the main body portions of the clamp fittings 1L and 1R are a semicircular arc-shaped outer frame ring 3 fitted into the outer peripheral portion of the flange joint F1, and a wide semicircular arc-shaped upper plate 4 formed on the upper side thereof. And each part of a narrow semicircular arc-shaped lower plate 5 formed on the lower side.
[0014]
Reference numerals 6L and 6R denote overhanging brackets fixed to the end portions of the clamp fittings 1L and 1R, respectively, and a pair of left and right clamp fittings 1L and 1R are pivoted by a connecting shaft 7 so as to be freely expandable. 8L and 8R are planar L-shaped overhanging brackets fixed to the base ends of the clamp fittings 1L and 1R, and one of the overhanging brackets 8L is provided with a fastener 9 having a hook 9A formed at the tip. A hook 10 that engages with the hook 9A is fixed to the other overhanging bracket 8R.
[0015]
Reference numeral 11 denotes an inclined groove having an appropriate width formed in the front and rear positions of the upper plate 4 of the clamp fittings 1L and 1R. When the clamp fittings 1L and 1R are fitted into the flange joint F1 and assembled, the center line of the inclined groove 11 is obtained. C is formed on a line that coincides with the radial direction of the flange joint F1, and the inclined groove 11 is inclined downward toward the outside of the upper plate 4, and the inclination angle of the inclined groove 11 with respect to the horizontal plane of the upper plate 4 is θ is formed at about 15 degrees.
[0016]
Reference numeral 12 denotes an inner semi-arc edge formed by cutting out the inner central portion of the upper plate 4 in a substantially semicircular shape, and the left and right bolt through holes 13 of the flange joints F1 and F2 are located at substantially the center position of the inner portion. I am doing so. Reference numeral 14 denotes a centering positioning edge of a disc-shaped gasket G that is fitted in the center between the flange joints F1 and F2, and intersects the front and rear end portions of the inner half-arc edge 12 and the inner end edge of the upper plate 4. The concentric circular position of the inner end portion on the center line C of the inclined groove 11 is cut off in the tangential direction or slightly in an arc shape, and the positioning edge 14 is substantially in contact with the outer peripheral surface of the gasket G, I am trying to make it out.
[0017]
Reference numeral 15 denotes a screw hole for mounting the slide gauge S, which will be described later. The clamp fittings 1L, 1R are located from the outer surface of the inclined groove 11 at a position on the center line C, approximately in the middle of the thickness of the outer frame ring 3. It is drilled toward the normal direction.
[0018]
The slide gauge S includes a pedestal portion 16 having a wedge-shaped tip portion and a push plate portion 17 having a base end portion vertical, and one of the pedestal portions 16 has a horizontal surface 16A on the upper side. The stopper protrusion 18 is vertically provided at a substantially intermediate position, and is formed on the inclined surface 16B having a downward slope from the bottom end to the base end. In this case, the inclination angle θ of the inclined surface 16B with respect to the horizontal surface 16A is formed to be about 15 degrees, which is the same as that of the inclined groove 11. Further, a stepped through hole 19 is formed at the center position of the other push platen portion 17.
[0019]
H is an operation member that moves the slide gauge S forward and backward, that is, an operation handle. A screw portion 20 that is screwed into the screw hole 15 is formed at the distal end portion of the handle, and an intermediate shaft portion 21 includes A saddle plate 22 is formed which is inserted into the large diameter side of the stepped through hole 19 to rotate, and a handle rod 24 is slidably passed through a shaft head portion 23 formed at the rear end portion of the shaft portion 21. The handle rod 24 is supported by caps 25 attached to both ends thereof to prevent the handle rod 24 from coming off.
26L and 26R are anti-detachment prevention plates for the operation handle H that are split into two, and are fitted into the shaft portion 21 at the rear portion of the saddle plate 22 from the left and right, and are fixed to the four corners of the press plate portion 17 by screws 27. It is fixed.
[0020]
[Modification]
In the above case, the shaft head 23 itself is made to function as an operation knob, so that the shaft head 23 can be rotated forward and backward with a fingertip, or the shaft head 23 is formed into a polygonal bolt head. In addition, the bolt head can be rotated forward and backward by a spanner or the like.
Therefore, the operation member of the slide gauge S according to the present invention has a concept including an operation handle H, an operation knob, a bolt head, and the like.
[0021]
Thus, the clamp fittings 1L and 1R according to the present invention are opened, one clamp fitting 1L is fitted into one side of the base side flange joint F1, and the other clamp fitting 1R is connected to the flange joint. Fit on the other side of F1.
At that time, the approximate center position of the inner half arc edge 12 of the upper plate 4 in the clamp fittings 1L, 1R is aligned and fitted so as to be the center of the bolt through hole 13 of the flange joint F1 as shown in FIG. Include.
Then, the bolt through holes 13 at the front and rear positions are aligned with the spatial positions between the front and rear inner edges of the opposing clamp fittings 1L and 1R.
[0022]
Then, by hooking and fastening the hook 9A of the fastener 9 of the clamp fitting 1L to the hook 10 of the clamp fitting 1R, the clamp fittings 1L and 1R are sandwiched and supported by the flange joint F1.
[0023]
Next, when the individual operation handles H of the slide gauge S are rotated, for example, in the clockwise direction, the screw portions 20 are screwed into the screw holes 15 of the clamp fittings 1L and 1R, and are passed through the flange plate 22 of the shaft portion 21. At the same time as the push plate portion 17 of the slide gauge S is pushed in the normal direction, the receiving portion 16 of the slide gauge S is gradually pushed up along the inclined grooves 11 of the clamp fittings 1L and 1R.
As a result, the cradle part 16 protrudes to a predetermined height above the upper plate 4 of the clamp fittings 1L, 1R.
At that time, by setting the gasket G in advance at the center position of the upper surface of the flange joint F1, the four sides of the gasket G are substantially held in contact with the positioning edges 14 of the clamp fittings 1L and 1R to be centered. Is done.
[0024]
Next, the other side of the flange joint F2 faces the inner side of the stopper projection 18 of the receiving part 16 of the slide gauge S, and the bolt through holes 13 of the flange joints F1 and F2 are vertically aligned and overlapped.
Then, the fastening bolt B is inserted from below the bolt through holes 13 of the flange joint F1, protrudes to the top of the flange joint F2, and is tightened with a torque wrench (not shown) with the fastening nut N screwed to the upper end thereof. To do.
Eventually, the bottom surface of the flange joint F2 comes into contact with the horizontal surface 16A of the cradle part 16 of the slide gauge S and cannot be tightened.
Thereby, the space between the flange joints F1 and F2 is formed in a predetermined gap, and the gasket G fitted between the flange joints F1 and F2 is tightly supported by applying an appropriate load uniformly. .
[0025]
Thereafter, when the operation handle H of each slide gauge S is rotated counterclockwise, the slide gauge S is loosened by being pushed down along the inclined groove 11. After that, the fastener 9 is opened to remove the clamp fittings 1L and 1R from the flange joint F1, thereby completing the assembling work of the gasket G.
[0026]
[Modification]
In the above embodiment, the pair of left and right clamp fittings 1L, 1R are formed to be openable and closable. However, as shown in FIG. 6, the clamp brackets 1L, 1R are fastened to one of the overhanging brackets 6L, 6R, 8L, 8R. The attached bolt 28 is inserted and supported, the fastening nut 29 is fixed to the other overhanging bracket 6L, 6R, 8L, 8R, and a pair of left and right clamp fittings 1L, 1R are fitted into the flange joint F1, and then the fastening bolt / nut 28 and 29 can also be tightened.
Alternatively, by forming the fastener 9 with the hook 9A and the hook 10 shown in the above embodiment on one of the overhanging brackets 6L, 6R, 8L, 8R of the clamp fittings 1L, 1R and the other, The clamp fittings 1L and 1R can be fastened and fixed to the flange joint F1.
[0027]
【The invention's effect】
The present invention inserts and supports a pair of left and right clamp fittings in a flange joint, and forms a slant groove that slopes downward in the radial direction of the flange joint on the clamp fitting, and slides on the slant groove. A gauge is fitted, and the slide gauge is formed from a cradle part and a push plate part. Among them, the upper part of the cradle part is formed on a horizontal surface and a stopper projection is projected, and the bottom part of the cradle part is clamped. It is formed on an inclined surface with the same downward slope as the inclined groove of the metal fitting, and an operation member that moves the slide gauge along the inclined groove is attached to the press platen. When assembling, by making the protruding height of the slide gauge uniform, the flange joint can be easily and quickly tightened.
[0028]
Therefore, the gasket fitted between the surfaces of the flange joint is not clamped and can be held in close contact with a uniform surface pressure.
At that time, the gasket can be easily centered, and various effects such as improvement in workability required for positioning can be obtained.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a slide gauge, an operating handle, and the like that are formed by opening a main body portion of a pair of left and right clamp fittings and fitting into the inclined grooves.
FIG. 2 is a plan view of a clamp fitting assembled to a flange joint.
3 is a cross-sectional view taken along the line XX of FIG. 2 showing a state in which a clamp fitting is mounted between the surfaces of the flange joint and tightened with fastening bolts and nuts.
FIG. 4 is an exploded perspective view before assembling a slope groove of a clamp fitting, a slide gauge fitted in the slope groove, an operation handle thereof, and the like.
FIG. 5 is a cross-sectional view of the main part showing the assembled state of the slide gauge assembled to the clamp fitting and its operation handle.
FIG. 6 is a view showing a modification of the clamp fitting.
[Explanation of symbols]
M1, M2 Inter-surface adjustment device F1, F2 Flange joint C Centerline θ Inclination angle B, 28 Fastening bolt N, 29 Fastening nut G Gasket S Slide gauge H Operation handle 1L, 1R Clamp fitting 2 Recess 3 Outer frame ring 4 Upper plate 5 Lower plate 6L, 6R, 8L, 8R Overhang bracket 7 Connecting pin 9 Fastener 9A, 10 Hook 11 Slope groove 12 Inner half arc edge 13 Bolt through hole 14 Positioning edge 15 Screw hole 16 Receiving part 16A Horizontal surface 16B Inclined surface 17 Pusher 18 Stopper projection 19 Stepped through hole 20 Screw 21 Shaft 22 Shaft 23 Shaft 23 Shaft head 24 Handle rod 25 Cap 26L, 26R Retaining prevention plate 27 Screw

Claims (3)

  A pair of left and right clamp fittings are fitted into and supported by a flange joint, and a slope groove is formed on the clamp fitting with a downward slope in the radial direction of the flange joint, and a slide gauge is fitted into the slope groove. The slide gauge is formed of a cradle part and a press platen part, and the upper part of the cradle part is formed in a horizontal plane, and a stopper projection is projected, and the bottom part of the cradle part is clamped by a clamp fitting. A flange joint inter-surface adjusting device, which is formed on an inclined surface having a downward slope similar to that of the inclined groove, and an operation member for moving the slide gauge along the inclined groove is attached to the push platen. .   A threaded portion in which an operating member of the slide gauge is screwed into a screw hole formed in the clamp fitting, a shaft portion inserted through the push plate portion, a flange portion formed on the shaft portion, and a rear end of the shaft portion The flange joint inter-face adjustment device according to claim 1, wherein the shaft head is formed as an operation knob or a bolt head.   The clamp fitting to be fitted into the flange joint is formed from each part of the outer frame ring, the upper plate, and the lower plate, and the inner half arc edge formed by cutting out the inner central portion of the upper plate in a substantially semicircular shape None, at the intersection of the front and rear ends of the inner semi-arc edge and the inner edge of the upper plate, the concentric position of the inner edge on the center line of the slope groove is cut off in the tangential direction or slightly in an arc shape. The flange joint inter-face adjustment device according to claim 1, wherein the cut-off edge is used as a positioning edge for centering a gasket fitted into the center of the flange joint.

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