JPH0346025Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Field of Application> This invention relates to a high-pressure slide gate installed in a circular conduit.

<Prior Art> Generally, a high-pressure slide gate whose gate leaf moves up and down within a housing by hydraulic pressure, motor drive, etc. is disposed in a circular conduit through which high-pressure fluid flows.

Note that a high-pressure slide gate refers to a high-pressure sliding gate that handles jet flow with a water head of 25 m or more and a flow rate of 5 m ³ /s or more, and is used for power generation, water utilization, etc.

As an example, as shown in Figure 8, upstream pipe A has a pipe length approximately 1.5 times the diameter of upstream pipe A, and one end is circular with the same diameter as upstream pipe A, and the other end is square. The tapered pipe B, the square pipe C, the gate leaf nut that can be raised and lowered within the housing by hydraulic drive, the square pipe E, and the pipe length is approximately 1.5 of the diameter of the downstream pipe.
The downstream pipe is connected to a tapered pipe whose one end is square and the other end has the same diameter as the downstream pipe.

<Problems to be solved by the invention> For this reason, in a circular pipe with a diameter of 2.0 m for the upper and downstream pipes A and G, the lengths of the tapered pipes B and H are, respectively.
3.0m, the length of square tubes C and E is 1.0m each,
If the housing length is 0.8m, the total length L is
8.8m is required. In addition, there is a risk that the square pipes C and E and the tapered pipes B and F may be deformed due to an increase in water pressure when the high-pressure slide gate is closed due to the gate reef, or due to water pressure fluctuations during opening and closing.
It is necessary to provide reinforcing ribs that are more robust than circular tubes A and D and protrude from the outer circumferential surface. Furthermore, since the tube shape changes from a circular tube to a square tube and then back to a circular tube, cavitation is likely to occur. In addition, square pipes are vulnerable to external pressure, and concrete burying work must be carried out carefully while using temporary supports, so concrete cannot be poured all at once. Due to these problems, partial rectangular pipes using square pipes C, E and tapered pipes R, F are approximately three times as heavy as the steel material compared to circular pipes, and the processing costs, installation costs, etc. are also high. It has the disadvantage of becoming. In addition, door grooves as shown in Figure 9 are formed on both sides of the housing, and since the bottom of the housing is flat, sand, dirt, etc. are likely to accumulate at the bottom of the door grooves.
Even if the gate reef tube shown in Figure 10 is lowered, it will not be able to contact the bottom of the housing hole, resulting in poor watertightness, and there is a risk that the pipeline that generates quicksand will be destroyed by the high-speed vortex that contains sand in the door groove. Cannot be used due to

<Means for solving the problems> This invention is intended to solve the above problems, and the contents are explained below in sections 1 to 5 corresponding to the examples.
This will be explained with reference to the figures. That is, in an equal diameter circular pipe line in which high pressure fluid flows at high speed from a circular upstream pipe 1.1 to a circular downstream pipe 2, 1 along the arrow, the high pressure Slide gate housing 3, downstream mounting pipes 2, 2,
The downstream pipes 2 and 1 are welded concentrically. Then, on the inner surfaces of the lower end walls 3, 6 of the housing 3, arcuate surfaces 4, 1 that coincide with the inner circumferential surface of the circular conduit, and obliquely upwardly inclined surfaces 4, 2 extending from the arcuate surfaces 4, 1,
4, fix the bottom door stop water stop plate 4 formed with 3,
A gate-shaped rear door stop water stop plate 5 that is slightly larger than the inner diameter of the circular conduit and has downwardly inclined portions 5, 1, 5, 2 formed on the inner surfaces of the rear walls 3, 2 of the housing 3. to be fixed. Further, a gate leaf 11 having elastic watertight plates 11, 9 fixed to the lower end face that can be pressed against the bottom door stop water stop plate 4 is installed so as to be movable up and down inside the housing 3, and the central angle of the arcuate surfaces 4, 1 is formed within 70 degrees.

<Example> Hereinafter, the structure and operation will be explained based on drawings showing an example of this invention. 1,1 is the upstream pipe,
1 and 2 are upstream mounting pipes, 2 and 1 are downstream pipes, and 2 and 2 are downstream mounting pipes, all of which constitute circular pipes of equal diameter. The upstream pipes 1 and 1 are connected to the upstream mounting pipes 1 and 2.
The downstream attachment pipes 2, 2 are concentrically welded to the downstream pipes 2, 1. 3 is the front wall 3,1 (upstream side),
Rear wall 3, 2 (downstream side), left and right side walls 3, 3, 3,
4. A housing for a high-pressure slide gate consisting of upper end walls 3, 5 and lower end walls 3, 6, the front wall 3,
Upstream mounting pipes 1 and 2 are concentrically welded to the rear walls 3 and 2, and downstream mounting pipes 2 and 2 are concentrically welded to the rear walls 3 and 2, respectively. and the back wall 3, 2 and the lower end wall 3, 6
The portion where the lower side of the edge portions 3, 7 extending in a curved shape from the lower side of the downstream mounting pipes 2, 2 interfere with each other is cut out, and the range of the central angle θ is the range of the downstream mounting pipes 2, 2. are welded to form an arcuate surface that coincides with the inner circumferential surface of. Correspondingly, the centers of the inner surfaces of the lower end walls 3 and 6 also form an arcuate surface that coincides with the above-mentioned arcuate surface within the range of the central angle θ, and both ends of the inner surface are inclined upwardly and are connected to each other from the arcuate surface. A surface is formed. Reference numeral 4 denotes a bottom door stop water stop plate that is fitted into and fixed to the inner surfaces of the lower end walls 3 and 6 of the housing 3, and the range of the central angle θ at the center forms arcuate surfaces 4 and 1 that coincide with the arcuate surface, and both ends thereof. Formed are obliquely upward inclined surfaces 4, 2, 4, 3 connected and extended from the arcuate surfaces 4, 1. Reference numeral 5 denotes a gate-shaped rear door stop water stop plate welded to the inner surfaces of the rear walls 3, 2 of the housing 3 and the bottom door stop water stop plate 4, and its inner dimension is slightly larger than the downstream mounting pipes 2, 2. , and an inclined part 5, 1 which is inclined upwardly downwardly.
5,2 are formed. 6 and 7 are front walls 3 and 1
The front door stop plate 8, 9 is fixed to the inner surface of the left and right side walls 3, 3, 4, respectively. Note that the housing 3 is provided with protrusions on the outer circumferential surface thereof in combination with vertical ribs in a lattice shape.

Reference numeral 11 denotes a gate leaf, to which longitudinal beams 11,2 are fixed in a lattice pattern to the cross beams 11,1, and box girders 11,3 are fixed to further strengthen the resistance against large bending moments. There are side plates 11, 4, 11, 5 on both the left and right sides, and a front plate 1 on the front.
1 and 6, back plates 11 and 7 are respectively welded to the rear surfaces, and bottom plates 11 and 8, which are similar in shape to the bottom door stop water stop plate 4, are welded to the lower ends. Also, the bottom plate 1
1 and 8 are elastic watertight plates 1 made of semi-hard rubber, etc.
1 and 9 are fixed so as to partially protrude downward. Reference numerals 11 and 10 denote back watertight plates fixed to the upper end and both side end portions of the back plates 11 and 7, which correspond to the back door stop water stop plate 5 and have substantially the same shape.

A piston stem 14 connected to the center of the upper end of the gate leaf 11 configured as described above is a piston head 1 that can be raised and lowered by hydraulic pressure within a hydraulic cylinder 12 that is vertically disposed on the upper end walls 3 and 5 of the housing 3.
It is connected to 3. The hydraulic cylinder 12 is connected via a pipe to a hydraulic power source (not shown). Therefore, the gate leaf 11 is held in an upright position by the rear door stopper plate 5, the front door stopper plates 6, 7, and the left and right guide plates 8, 9 of the housing 3, and moves in conjunction with the piston head 13 to move the housing 3. It is possible to go up and down inside.

In the high-pressure slide gate of this invention having such a configuration, when the gate leaf 11 pressed against the bottom door stopper plate 4 (occluded) rises (opens), the high-pressure fluid flows into the upstream pipe 1 in the direction of the arrow. ，
1. The fluid flows from the upstream mounting pipes 1 and 2 (upstream side) through the housing 3 to the downstream mounting pipes 2 and 2 and the downstream pipes 2 and 1 (downstream side) with little turbulence and in a circular shape. Conversely, when the gate leaf 11 descends toward the bottom door stop water stop plate 4, the load stress increases; , 2 are wider as they move downward, and the opening of the waterstop plate 5 at the rear door has a shorter span. For this reason, the box girders 11 and 3 of the gate leaf 11
It is press-fitted tightly to the bottom door stop water stop plate 4 while reducing the load stress.

In addition, during this descent, the hydrodynamic pressure generated by the increasing hydrostatic pressure and the inertia of the high flow rate spreads from the rear door stop water stop plate 5 to the outer periphery of the downstream attachment pipes 2, 2 via the rear walls 3, 2. It is distributed and communicated.

When the gate leaf 11 is located at the uppermost position to open the conduit, the lower end of the gate leaf 11 is in contact with the upper side of the back door stopper plate 5.

The gate leaf 11 is in the half-open position (approximately 2 in Fig. 2).
When descending to the position shown by the dotted chain line, almost the upper half of the pipe becomes the pressure receiving surface, and the hydraulic load is
On the back side of the gate leaf 11, it is supported by the upper side and left and right side sides of the back door stop water stop plate 5. Therefore, an increase in the hydraulic load due to the lowering of the gate leaf 11 results in an increase in the pressure receiving surface, which in turn leads to an increase in the support surface by the waterstop plate 5 for the rear door stop. At this time, almost watertightness is maintained between the gate leaf 11 and the rear door stop water stop plate 5, and there is almost no flow velocity on the rear side of the gate leaf 11.
has no vibration.

When the gate leaf 11 further descends and closes the pipe, due to the horizontal hydraulic load, the gate leaf 11 is moved to the upper side of the rear door stopper plate 5 including the diagonally upwardly inclined parts 5, 1, 5, 2, It is crimped to the entire surface of both sides. In addition, a predetermined range of the lower side of the gate leaf 11 (the obliquely upward inclined portions 5 and 1 in FIG.
In the area (corresponding to the area between the lower end and the lower end of the obliquely upwardly inclined parts 5 and 2), the direction of the closed row is the vertical direction, and the gate leaf 11 is in close contact with the bottom doorstop water stop plate 4. In this way, the rear door stop water stop plate 5 supports the hydraulic load received by the gate leaf 11 with the minimum span on the outer periphery of the circular conduit, thereby distributing the load.

In addition, the water stop plate 5 for the rear door is connected to the gate leaf 11.
The arcuate surfaces 4, 1 of the bottom door stop water stop plate 4 and the upwardly inclined surfaces 4, 2, 4, 3 are guided in the vertical direction.
Press it correctly. Therefore, the watertight function of this high-pressure slide gate is achieved by a two-way water-stopping system, with the water-stopping plate 5 on the rear doorstop for vertical surfaces and the water-stopping plate 4 for the bottom doorstop for horizontally curved surfaces. .
In addition, the lower end walls 3 and 6 of the housing 3 and the bottom door stop water stop plate 4 are sloped so that the center part is lower than both end parts, so sand, dirt, etc. do not accumulate, and the back walls 3 and 2 The extended edge portions 3 and 7 are formed in a curved shape, and the inner dimension of the rear door stop water stop plate 5 is formed to be slightly larger than the inner diameter of the downstream attachment pipes 2 and 2, so that high-pressure fluid flows into the rear wall. 3 and 2, the flow condition was stable even after passing through the housing 3, and no cavitation was observed in model experiments.

Furthermore, the gaps between the curved portions on the lower side of the edge portions 3 and 7, the rear door stop water stop plate 5, the rear walls 3 and 2, and the gate leaf 11 are minute;
The pressure on the downstream side is always lower or negative than that on the upstream side. Therefore, the high pressure of the upstream water pressure is always applied to the gate leaf 11, and the gate leaf 11 is constantly pressed downstream by the water pressure on both sides and moves up and down.
does not vibrate.

In addition, FIGS. 6 and 7 show other embodiments, and FIGS.
Similar to the housing 3 shown in FIG. The difference is that the angle is larger than θ. This increases the corresponding bending moment of the box girders 11 and 3 of the gate leaf 11. From this point, the circular arc surface 23, 61 at the center of the lower end wall
is bent slightly downward from the tangential direction from both ends to form diagonally upward inclined surfaces 23, 62, 23, 63 to strengthen resistance to the bending moment, and all other It is similar to the figure.

<Effects of the invention> As described above, the high-pressure slide gate for circular pipes according to this invention has the following features: (1) to the inner surface of the lower end wall of the housing;
A bottom door stop water stop plate is fixed to the central arcuate surface and an upwardly sloping surface extending from the arcuate surface.
(2) The shape of the lower end wall was also formed in almost the same shape as this, (3) a gate leaf was used whose lower end surface was formed in a similar shape to the lower end wall, and (4) it was extended in a curved shape on the back wall. By forming the edge part, etc., there is no need for conventional tapered pipes, square pipes, etc., and the total length is significantly shorter than before (approx.
6m), and the pressure fluctuations of the high-pressure fluid passing through the housing and the vibrations of the gate leaf are smaller than before, making the flow situation more stable and making it easier to reduce the force at the downstream discharge point.

In addition, the water stop plate for the rear door can absorb the hydraulic load received by the gate leaf in a circular conduit with a minimum span, thereby distributing the load, and can correctly guide the gate leaf in the vertical direction.
Furthermore, because the pipe is circular, there is less deformation, better stress distribution, and fewer reinforcing ribs, making it resistant to external pressure.
In addition, the lower end of the gate leaf is guided to the correct position by the rear door stop water stop plate, and is accurately pressed against the bottom door stop water stop plate, which is a combination of an arcuate surface and an inclined surface, making the curved surface watertight. Summer.

Similarly, by eliminating the door groove at the bottom of the housing, it becomes easier for sand, dirt, etc. to flow down, and it is possible to eliminate defects in the gate leaf that cannot be tightly closed due to their accumulation.

Moreover, the high-pressure slide gate of this invention can be installed in narrow spaces or short discharge pipes, and it has great economic effects, such as reducing manufacturing costs, installation costs, etc.

[Brief explanation of the drawing]

1 to 7 show an embodiment of this invention, FIG. 1 is a vertical side view showing its outline, FIG. 2 is an enlarged sectional view taken along the line A-A shown in FIG. 1, and FIG. 4 is a partially cutaway front view of the gate leaf, FIG. 5 is a sectional view taken along C-C shown in FIG. 4, and FIG. 6 is a sectional view of another gate housing. The vertical sectional view, FIG. 7 is a sectional view taken along the line DD shown in FIG. 6. Figures 8 to 10 show a conventional example, Figure 8 is a vertical side view showing its outline, Figure 9 is an enlarged sectional view taken along the line E-E shown in Figure 8, and Figure 10 is a partial cutaway of the gate leaf. It is a cutaway front view. 1, 1, 1, 2, 2, 1, 2, 2... Equal diameter circular pipe line, 3... Housing, 3, 2... Back wall,
3, 6...Lower end wall, 4...Bottom door stop water stop plate,
4, 1... Arc surface, 4, 2, 4, 3... Diagonally upward slope, 5... Rear door stopper, 5, 1,
5, 2...Upward slope, 11...Gate leaf, 11,3...Box girder, 11,9...Elastic watertight plate.

Claims (1)

[Scope of utility model registration request] A bottom door stop water stop plate is fixed to the inner surface of the lower end wall of the high-pressure slide gate housing, and has a circular arc surface that matches the inner circumferential surface of an equal-diameter circular conduit and an upwardly inclined surface that extends from the arc surface. , A gate-shaped rear door stop water stop plate, which is slightly larger than the inner diameter of the circular conduit and has an upwardly sloped part formed on the lower side, is fixed to the inner surface of the back wall of the housing, and the bottom door stop water stop plate is fixed to the inner surface of the back wall of the housing. For circular pipes, characterized in that a gate leaf with an elastic watertight plate fixed to the lower end face that can be pressed against the plate is installed in the housing so as to be movable up and down, and the central angle of the circular arc surface is formed within 70 degrees. High pressure slide gate.