JP3716075B2 - Gate - Google Patents

Description

【００２０】
円形管路１８内の流速は速い場合でも５ｍ／ｓ程度である。従って、［表１］に示すように［トランジション長さＬ／ゲート高さＴ］の値を従来値の１．１９から０．３６に減じて損失係数が０．０４７から０．０７６に増加しても、損失圧力の増加値は約３６０Ｐａであり、充分に実用可能である。しかし、これ以上の短縮化は、損失係数が急増傾向を示しているため不適切である。そこで上記の如く、［トランジション長さＬ／ゲート高さＴ］の値の下限は０．３６としている。
【００２１】
一方、上下流側トランジション１３，１７の短縮度が小さいと、上下流側トランジション１３，１７の重量が重過ぎて上下流側ケーシング１４，１６との一体化を実現することはできないため、上記のように、上下流側トランジション１３，１７の長さＬの上限はゲート高さＴの０．５倍としている。
【００２２】
従って、本実施の形態に係るゲート１１によれば、次にような効果が得られる。
【００２３】
▲１▼ 上下流側トランジション１３，１７の長さＬをゲート高さＴの０．３６〜０．５倍の範囲としたことにより、重量が大幅に低減し、ゲート１１はコスト的に優位なものとなる。
【００２４】
▲２▼ また、上下流側トランジション１３，１７の長さＬをゲート高さＴの０．５倍以下として、この上下流側トランジション１３，１７と上下流側ケーシング１４，１６とを一体化したことにより、機能的且つコンパクトな構造となる。しかも、上下流側トランジション１３，１７の長さＬをゲート高さＴの０．３６倍以上とすることにより、流れのエネルギー損失を小さい範囲内に抑えることができ、従来の性能を損なうことはない。
【００２５】
▲３▼ そして、上下流側トランジション１３，１７と上下流側ケーシング１４，１６とを一体化したことにより、これらを一括して現地まで輸送することができ、現地での据え付けも容易になるため、ゲート１１は輸送性及び据付性に優れたものとなる。
【００２６】
なお、上記では上下流側ケーシング１３，１７の長さＬの上限をゲート高さＴの０．５倍としているが、必ずしもこれに限定するものではなく、条件に応じて異なる可能性がある。例えば、管径の比較的小さい円形管路に本発明のゲートを用いる場合には、このゲートに備える上下流側トランジションも比較的小さなものになるため、この場合の上下流側トランジションは、その長さをゲート高さの０．５倍より多少長くして上下流側ケーシングと一体化しても、輸送時の重量制限を満たすことができる可能性がある。
【００２７】
【発明の効果】
以上、発明の実施の形態と共に具体的に説明したように、本発明のゲートは、流速が比較的低速である円形管路の途中に設置されるゲートであって、流路を開閉する扉体とこの扉体の上下流側にそれぞれ設けた上流側ケーシング及び下流側ケーシングとを有してなるゲート部と、前記上流側ケーシングの上流側及び前記下流側ケーシングの下流側にそれぞれ設けた上流側トランジション及び下流側トランジションとを有し、前記ゲート部の流路の断面形状は矩形である一方、前記上流側トランジション及び下流側トランジションの流路の断面形状は前記ゲート部側の一端から他端に向かって前記ゲート部と同じ矩形から前記円形管路と同じ円形へと断面積を変えずに遷移しているゲートにおいて、
前記上流側トランジション及び下流側トランジションの長さは、前記上流側ケーシング及び下流側ケーシングとの一体化が可能な重量となる長さ以下であって、且つゲート高さの０．３６倍以上であることを特徴とする。
【００２８】
従って、このゲートによれば、次にような効果が得られる。
【００２９】
▲１▼ 上下流側トランジションの長さを上下流側ケーシングとの一体化が可能な重量となる長さであって且つゲート高さの０．３６倍以上としたことにより、重量が大幅に低減し、ゲートはコスト的に優位なものとなる。
【００３０】
▲２▼ また、上下流側トランジションの長さを上下流側ケーシングとの一体化が可能な重量となる長さとしたことにより、上下流側トランジションと上下流側ケーシングとを一体化して機能的且つコンパクトな構造とすることができる。しかも、上下流側トランジションの長さをゲート高さの０．３６倍以上とすることにより、流れのエネルギー損失を小さい範囲内に抑えることができ、従来の性能を損なうことはない。
【００３１】
▲３▼ そして、上下流側トランジションと上下流側ケーシングとを一体化することにより、これらを一括して現地まで輸送することができ、現地での据え付けも容易になるため、ゲートは輸送性及び据付性に優れたものとなる。
【図面の簡単な説明】
【図１】（ａ）は本発明の実施の形態に係るゲートの要部概略構造を示す平面図、（ｂ）は前記ゲートの要部概略構造を示す側面図である。
【図２】前記ゲートの詳細構造を縦に破断し分離して示す斜視図である。
【図３】前記ゲートの要部詳細構造を分解して示す縦断面の斜視図である。
【図４】（ａ）は従来のゲートの要部概略構造を示す平面図、（ｂ）は前記ゲートの要部概略構造を示す側面図である。
【図５】前記ドラフトゲートの要部詳細構造を分解して示す縦断面の斜視図である。
【符号の説明】
１１ ゲート
１２ ゲート部
１３ 上流側トランジション
１４ 上流側ケーシング
１５ 扉体
１６ 下流側ケーシング
１７ 下流側トランジション
１８ 円形管路
Ｌ トランジション長さ
Ｔ ゲート高さ[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a gate installed in the middle of a circular pipeline, and is useful when applied to a draft gate of a sluice facility of a power plant.
[0002]
[Prior art]
When using a slide gate in the middle of a circular pipe, in general, in order to reduce the width (weight) of the slide gate, a transition that changes the cross-sectional shape of the pipe from circular to rectangular without changing the cross-sectional area is a gate part. Provided on the upstream and downstream sides. When providing a transition, it is necessary to change the cross-sectional area so that turbulence of streamlines or cavitation due to separation of streamlines does not occur. The length of the transition is conventionally set to, for example, 1.19 times the gate height (see [Table 1]).
[0003]
4A is a plan view showing the schematic structure of the main part of a conventional gate, FIG. 4B is a side view showing the schematic structure of the main part of the gate, and FIG. 5 is an exploded view of the detailed structure of the main part of the draft gate. It is a perspective view of the longitudinal section shown.
[0004]
As shown in these drawings, the gate 1 is installed in the middle of the circular pipe 8, and the gate portion 2, the upstream transition 3 and the downstream transition provided on the upstream and downstream sides of the gate portion 2, respectively. 7.
[0005]
The cross-sectional shape of the flow path of the gate portion 2 is rectangular, and the gate portion 2 includes a door body 5 that slides up and down by driving a hydraulic cylinder (not shown) and opens and closes the flow path. Thus, an upstream casing 4 and a downstream casing 6 provided on the upstream and downstream sides of the door body 5 are provided.
[0006]
The upstream and downstream side transitions 3 and 7 are provided on the upstream side of the upstream casing 4 and the downstream side of the downstream casing 6 in order to suppress the separation of streamlines and keep the flow energy loss small as described above. The cross-sectional shape of the flow path is changed from the same rectangle as the gate portion 2 toward the other end from the one end on the gate portion 2 side without changing the cross-sectional area from the same circle as the circular pipe 8.
[0007]
[Problems to be solved by the invention]
However, in the conventional gate 1 described above, even when the flow velocity in the circular pipe 8 is relatively low, the upstream and downstream transitions 3 and 7 of the long pipe (for example, 1.19 times the gate height) are provided. It was applied, and it was not an optimal design according to the flow rate. Since the upstream and downstream side transitions 3 and 7 are too heavy, the upstream and downstream side transitions 3 and 7 and the upstream and downstream side casings 4 and 6 are separated from each other and transported separately to the site due to weight restrictions during transportation. Then, they were combined at the time of local installation. That is, the conventional gate 1 has poor transportability and installation.
[0008]
Therefore, in view of the above-described conventional technology, an object of the present invention is to provide a gate that is excellent in transportability and installation property and does not impair conventional performance.
[0009]
[Means for Solving the Problems]
In the gate of the present invention, when the flow velocity in the circular pipe is relatively low, that is, at most about 5 m / s, the value of [transition length / gate height] is set to the conventional value (for example, 1 .19) to 0.36, the increase in the loss pressure is small and based on the knowledge (confirmed by analysis and experiment) that it is sufficiently practical (details will be described later). It has a configuration.
[0010]
That is, the gate of the present invention that solves the above problems is a gate that is installed in the middle of a circular pipe having a relatively low flow velocity, and is provided on a door body that opens and closes the flow path and on the upstream and downstream sides of the door body. A gate portion having an upstream casing and a downstream casing, respectively, and an upstream transition and a downstream transition provided on the upstream side of the upstream casing and the downstream side of the downstream casing, respectively. The cross-sectional shape of the flow path of the gate portion is rectangular, while the cross-sectional shape of the flow path of the upstream transition and the downstream transition is from the same rectangle as the gate portion from one end to the other end on the gate portion side. In the gate that has changed to the same circular shape as the circular pipe without changing the cross-sectional area,
The length of the upstream side transition and the downstream side transition is not more than a length capable of being integrated with the upstream casing and the downstream casing, and is not less than 0.36 times the gate height. It is characterized by that.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[0012]
FIG. 1A is a plan view showing a schematic structure of a main part of a gate according to an embodiment of the present invention, FIG. 1B is a side view showing the schematic structure of a main part of the gate, and FIG. FIG. 3 is a perspective view of a longitudinal section showing the detailed structure of the main part of the gate in an exploded manner.
[0013]
As shown in these drawings, the gate 11 according to the present embodiment is installed in the middle of the circular pipe 18, and the gate portion 12 and the upstream side provided on the upstream and downstream sides of the gate portion 12, respectively. It has a transition 13 and a downstream transition 17.
[0014]
The cross-sectional shape of the flow path of the gate portion 12 is rectangular. The gate portion 2 includes a door body 15 that slides up and down to open and close the flow path, and an upstream and downstream of the door body 15 so as to surround the door body 15. An upstream casing 14 and a downstream casing 16 provided on the side are provided. Further, a hydraulic cylinder 19 is provided on the upstream and downstream casings 14 and 16, and the door body 15 is driven up and down by the hydraulic cylinder 19.
[0015]
The cross-sectional shape of the flow path of the upstream / downstream transitions 13 and 17 changes from one end on the gate portion 12 side to the other end without changing the cross-sectional area from the same rectangle as the gate portion 12 to the same circle as the circular pipe 18. are doing.
[0016]
The length L of the upstream / downstream transitions 13 and 17 is such that the gate height is T and the value of [transition length L / gate height T] is 0.36 to 0.5. The upstream transition 13 and the upstream casing 14, and the downstream transition 17 and the downstream casing 16 are integrated.
[0017]
In other words, by making the length L of the upstream / downstream transitions 13, 17 less than 0.5 times the gate height T, the weight of the upstream / downstream transitions 13, 17 is integrated with the upstream / downstream casings 14, 16. The weight is sufficient to satisfy the weight limit during transportation. In addition, by making the length L of the upstream / downstream transitions 13 and 17 0.36 times or more the gate height T, the flow energy loss is suppressed within a small range. This point will be specifically described based on [Table 1].
[0018]
Table 1 shows the results of analysis and experiment confirming the relationship between the shortening of the transition length and the change in flow energy loss.
[0019]
[Table 1]

[0020]
Even when the flow velocity in the circular pipe 18 is high, it is about 5 m / s. Therefore, as shown in [Table 1], the value of [transition length L / gate height T] is reduced from 1.19 of the conventional value to 0.36, and the loss factor is increased from 0.047 to 0.076. However, the increase value of the loss pressure is about 360 Pa, which is sufficiently practical. However, further shortening is inappropriate because the loss factor shows a tendency to increase rapidly. Therefore, as described above, the lower limit of the value of [transition length L / gate height T] is set to 0.36.
[0021]
On the other hand, if the degree of shortening of the upstream / downstream transitions 13 and 17 is small, the weight of the upstream / downstream transitions 13 and 17 is too heavy and cannot be integrated with the upstream / downstream casings 14 and 16. Thus, the upper limit of the length L of the upstream / downstream transitions 13 and 17 is 0.5 times the gate height T.
[0022]
Therefore, according to the gate 11 according to the present embodiment, the following effects can be obtained.
[0023]
(1) By setting the length L of the upstream and downstream side transitions 13 and 17 to be in the range of 0.36 to 0.5 times the gate height T, the weight is greatly reduced, and the gate 11 is superior in cost. It will be a thing.
[0024]
(2) Further, the length L of the upstream / downstream transitions 13, 17 is set to 0.5 times or less of the gate height T, and the upstream / downstream transitions 13, 17 and the upstream / downstream casings 14, 16 are integrated. This provides a functional and compact structure. In addition, by making the length L of the upstream / downstream transitions 13 and 17 0.36 times or more the gate height T, the energy loss of the flow can be suppressed within a small range, and the conventional performance is impaired. Absent.
[0025]
(3) Since the upstream / downstream transitions 13 and 17 and the upstream / downstream casings 14 and 16 are integrated, they can be transported to the site all together and can be easily installed on site. The gate 11 is excellent in transportability and installation.
[0026]
In the above description, the upper limit of the length L of the upstream and downstream casings 13 and 17 is set to 0.5 times the gate height T. However, the upper limit is not necessarily limited to this and may vary depending on conditions. For example, when the gate of the present invention is used in a circular pipe having a relatively small pipe diameter, the upstream / downstream transition provided in the gate is also relatively small. Even if the length is made slightly longer than 0.5 times the gate height and integrated with the upstream / downstream casing, there is a possibility that the weight limit during transportation can be satisfied.
[0027]
【The invention's effect】
As described above in detail with the embodiment of the present invention, the gate of the present invention is a gate installed in the middle of a circular pipe having a relatively low flow velocity, and opens and closes the flow path. And an upstream side provided on the upstream side of the upstream casing and on the downstream side of the downstream casing, respectively, and a gate portion having an upstream casing and a downstream casing provided on the upstream and downstream sides of the door body, respectively. A cross-sectional shape of the flow path of the gate portion is rectangular, while a cross-sectional shape of the flow path of the upstream transition and the downstream transition is from one end to the other end on the gate portion side. In the gate that is changing without changing the cross-sectional area from the same rectangle as the gate portion toward the same circle as the circular pipe,
The length of the upstream side transition and the downstream side transition is not more than a length capable of being integrated with the upstream casing and the downstream casing, and is not less than 0.36 times the gate height. It is characterized by that.
[0028]
Therefore, according to this gate, the following effects can be obtained.
[0029]
(1) The length of the upstream / downstream transition is such that it can be integrated with the upstream / downstream casing and is more than 0.36 times the gate height, greatly reducing the weight. However, the gate is advantageous in terms of cost.
[0030]
(2) Further, the length of the upstream / downstream transition is set to such a weight that can be integrated with the upstream / downstream casing, so that the upstream / downstream transition and the upstream / downstream casing are integrated and functional. A compact structure can be obtained. Moreover, by setting the length of the upstream / downstream transition to 0.36 times or more of the gate height, the energy loss of the flow can be suppressed within a small range, and the conventional performance is not impaired.
[0031]
(3) And by integrating the upstream / downstream transition and the upstream / downstream casing, they can be transported to the site all at once, and installation at the site becomes easy. It is excellent in installation.
[Brief description of the drawings]
FIG. 1A is a plan view showing a schematic structure of a main part of a gate according to an embodiment of the present invention, and FIG. 1B is a side view showing the schematic structure of the main part of the gate.
FIG. 2 is a perspective view showing a detailed structure of the gate in a vertically cut and separated state.
FIG. 3 is a perspective view of a longitudinal section showing an exploded detail structure of a main part of the gate.
4A is a plan view showing a schematic structure of a main part of a conventional gate, and FIG. 4B is a side view showing a schematic structure of a main part of the gate.
FIG. 5 is a perspective view of a longitudinal section showing a detailed structure of a main part of the draft gate in an exploded manner.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 11 Gate 12 Gate part 13 Upstream side transition 14 Upstream side casing 15 Door body 16 Downstream side casing 17 Downstream side transition 18 Circular pipe line L Transition length T Gate height

Claims (1)

A gate installed in the middle of a circular pipe having a relatively low flow rate, and has a door body that opens and closes the flow path, and an upstream casing and a downstream casing respectively provided on the upstream and downstream sides of the door body. And an upstream transition and a downstream transition provided on the upstream side of the upstream casing and the downstream side of the downstream casing, respectively, and the cross-sectional shape of the flow path of the gate part is rectangular On the other hand, the cross-sectional shape of the flow path of the upstream transition and the downstream transition changes from the same rectangle as the gate portion to the same circle as the circular pipe line from one end to the other end on the gate portion side. In the gate that is transitioning without
The length of the upstream side transition and the downstream side transition is not more than a length capable of being integrated with the upstream casing and the downstream casing, and is not less than 0.36 times the gate height. A gate characterized by that.

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