JP2007092507A - Jet flow gate - Google Patents

Jet flow gate Download PDF

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Publication number
JP2007092507A
JP2007092507A JP2005361675A JP2005361675A JP2007092507A JP 2007092507 A JP2007092507 A JP 2007092507A JP 2005361675 A JP2005361675 A JP 2005361675A JP 2005361675 A JP2005361675 A JP 2005361675A JP 2007092507 A JP2007092507 A JP 2007092507A
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Japan
Prior art keywords
door
water discharge
jet flow
gate
notch
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Pending
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JP2005361675A
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Japanese (ja)
Inventor
Kyoichi Nakaho
京一 仲保
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Hitachi Zosen Corp
日立造船株式会社
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Application filed by Hitachi Zosen Corp, 日立造船株式会社 filed Critical Hitachi Zosen Corp
Priority to JP2005361675A priority patent/JP2007092507A/en
Publication of JP2007092507A publication Critical patent/JP2007092507A/en
Pending legal-status Critical Current

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Abstract

A jet flow gate with a large spout area can be manufactured.
A jet flow gate is provided with a door body 2 that is provided so as to be movable in a radial direction of a valve body interposed in a water discharge flow path 1 and that opens and closes the water discharge flow path 1. The shape of the outlet 1a of the water discharge channel 1 facing the door 2 is, for example, a shape in which semicircular arcs rf1 and rf2 of the same radius arranged vertically are connected by straight lines s1 and s2. If necessary, a notch 2b is formed at the edge of the door body 2 so as to be located outside the water discharge channel when the door is closed, and to open the water discharge channel 1 when the door is opened.
[Effect] A jet flow gate having a larger discharge area can be manufactured. Further, when the outlet area is the same, the minimum flow rate control amount can be reduced. In addition, if a notch-shaped notch is formed, it can easily reduce the hydraulic flow instability phenomenon and suppress the hydraulic flow instability phenomenon while suppressing the rigidity reduction and stress concentration caused by the notch. The amount of water discharged can be adjusted.
[Selection] Figure 1

Description

  The present invention relates to a jet flow gate interposed in a water discharge channel of a dam, for example.

For example, a dam is provided with a channel for water discharge, and water is discharged as needed. This water discharge is performed by operating a jet flow gate interposed in the water discharge channel.
As shown in FIG. 6, this jet flow gate is provided with a rectangular valve body 2 (not shown) connected to a water discharge flow path 1 and a rectangular door body 2 in the radial direction of the valve body. It is the structure which opens and closes the water discharge flow path 1 by moving the door body 2 with a hydraulic cylinder.

  In the jet flow gate having such a configuration, the watertightness when the door is closed is maintained by the ring seal 3 provided at the outlet 1a of the water discharge channel 1 facing the door body 2 being pressed against the door body 2 by water pressure. Is done.

  By the way, the discharge port shape of the water discharge channel 1 in which the jet flow gate is interposed is usually circular as shown in FIG. Of course, in such a circular spout 1a, the ring seal 3 is also circular. However, in order to obtain a good sealing property, this ring seal 3 is transported to a construction site by a unit machined at a factory. ing.

  A dam may discharge a large amount of water, such as during power generation or flooding, and may discharge a small amount of water to adjust the water level or maintain the water level. In the case of performing such water discharge control, the rectangular door body 2 has a region (indicated by an arrow A in FIG. 6B) in which the interference of the upper and lower water veins acts strongly to cause hydraulic instability. Wide, it is difficult to adjust the opening when a small amount of water is discharged.

Therefore, in Patent Document 1, as shown in FIG. 7, a jet in which an inverted V-shaped notch 2 a is formed at the lower end portion of the door body 2 so as to extend from the width center of the door body 2 toward both outer sides. A flow gate has been proposed. According to this, when the door is closed, the notch located outside the water discharge flow path opens the water discharge flow path in accordance with the opening operation, so that it is possible to accurately adjust the water discharge amount at the time of minute water discharge. .
JP-A-11-270706

However, in the conventional jet flow gate having a circular outlet, the maximum diameter of the jet flow gate is 2.8 m and the outlet area is 6.157 m 2 in consideration of transportation of the ring seal by a truck or the like. The spout area cannot be increased as described above. In this respect, the one proposed in Patent Document 1 is not changed.

  Further, according to the actual machine test by the inventor at the time of minute water discharge, it was found that the jet flow gate formed with the inverted V-shaped notch proposed in Patent Document 1 has the following problems. Yes.

(1) Water discharge veins interfere with each other with respect to the opening of the door body, and the water veins 4 at points A and B (see FIG. 7B) of the notch 2a are likely to be splashed (FIG. 8A). (Refer to (b)), which causes problems in the management of discharge such as cavitation and vibration.
(2) Although the door is provided with a strength member to receive high pressure, the presence of the inverted V-shaped notch still reduces the rigidity of the door and generates vibration and noise during water discharge.
(3) Stress concentrates on the inverted V-shaped notch and fatigues.

  The problem to be solved by the present invention is that, in the conventional jet flow gate, the maximum outlet area is determined from the transport limit of the ring seal, and the inverted V-shape is used to accurately adjust the water discharge amount at the time of minute water discharge. When the notch is provided, there is a problem that cavitation occurs.

The jet flow gate of the present invention is
In order to improve the transport limit and enable the production of jet flow gates with larger spout areas,
In the jet flow gate provided with a door body that is provided so as to be movable in the radial direction of the cylindrical valve body interposed in the water discharge flow path, and opens and closes the water discharge flow path,
The outlet shape of the water discharge channel facing the door body is (1) a shape in which semicircular arcs of the same radius arranged above and below are connected by a straight line, (2) an elliptical shape whose major axis is in the vertical direction, (3 ) It is symmetrical only to the left and right, and the distance in the width direction decreases as it goes downward from the middle part of the spout, or it decreases as it goes downward after maintaining the same width from the middle part of the spout The most important feature is that the shape is formed by using any one of an arc, an elliptical arc, and a straight line.

  In the jet flow gate of the present invention, when an edge of the door body is formed with a notch that is located outside the water discharge channel when the door is closed and opens the water discharge channel when the door is opened. Can accurately adjust the amount of water discharged when a small amount of water is discharged, and cavitation does not occur when a small amount of water is discharged.

  The jet flow gate of the present invention has a discharge outlet shape of the water discharge channel facing the door body, (1) a shape in which semicircular arcs of the same radius arranged above and below are connected by a straight line, and (2) a long axis is defined as the vertical direction. (3) It is symmetrical only in the left and right direction, and the distance in the width direction decreases as it goes downward from the middle part of the spout, or the lower part after maintaining the same width from the middle part of the spout. Since the shape is formed by using any one of an arc, an elliptical arc, and a straight line so as to decrease as it goes to, even a ring seal having a larger outlet area can be transported by truck or the like compared to a circular outlet shape. . Therefore, it is possible to manufacture a jet flow gate having a larger discharge area. Further, in the case of the same outlet area, the diameter can be reduced as compared with the circular outlet shape, so that the minimum flow rate control amount can be reduced.

  Further, in the jet flow gate of the present invention, if a notch-like notch is formed on the edge of the door body, it is located outside the water discharge channel when the door is closed and opens the water discharge channel when the door is opened. In addition, it is possible to easily reduce the hydraulic flow instability phenomenon and to adjust the water discharge amount at the time of a small amount of discharge with high accuracy while suppressing the decrease in rigidity and stress concentration due to the notch.

Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to FIGS.
FIG. 1 is a schematic diagram for explaining a first example of the present invention, FIG. 2 is a diagram for explaining second to sixth examples of the present invention, and FIG. 3 is a schematic diagram for explaining a seventh example of the present invention. .

  FIG. 1 is a diagram for explaining a first example of a jet flow gate according to the present invention. In this first example, the shape of the outlet 1a of the water discharge channel 1 facing the door body 2 movably provided in the radial direction of the valve body is, for example, the maximum diameter when the outlet shape is circular ( 2.8 m), which has the same outlet area, both 1.9 m in diameter and vertically arranged semicircular arcs rf1 and rf2 connected by straight lines s1 and s2, with a width of 1.9 m and the maximum length in the vertical direction The length is 3.65m.

  Thus, in the present invention in which the discharge port 1a has a shape in which the semicircular arcs rf1 and rf2 having the same radius are connected by the straight lines s1 and s2, the diameter can be made smaller than the circular shape in the case of the same discharge port area (in the above example, 2 .8m to 1.9m). Therefore, even the ring seal 3 having a larger discharge area than before can be transported by truck, and a larger jet flow gate can be manufactured. For the same reason, the minimum flow rate control amount can be reduced.

  Further, in the jet flow gate of the present invention that employs the spout 1a having the shape in which the semicircular arcs rf1 and rf2 having the same radius are connected by the straight lines s1 and s2, the diameter is smaller than the circular shape in the case of the same spout area. Since it can do, the distance between the branches of the door body 2 can be made small. Therefore, less strength members are used and the weight of the door can be reduced.

  The outlet shape of the flow jet gate of the present invention is not limited to the shape in which the semicircular arcs rf1 and rf2 having the same radius are connected by the straight lines s1 and s2, as shown in FIG. The shape as shown in e) may be used.

  In FIG. 2A, from the viewpoint of reducing the minimum flow rate control amount, the diameter of the upper arc r1 is made larger than that of the lower arc r2, and the upper arc r1 and the straight lines s1 and s2 having a larger diameter are made smaller arcs. It is connected via rs1. FIG. 2B shows an elliptical shape having the major axis in the vertical direction.

  2 (c) to 2 (e) are symmetrical, and FIG. 2 (c) shows the short axis in the vertical direction so that the distance in the width direction decreases as it goes downward from the middle part of the spout. The elliptical arc ro1 having a small radius is arranged upward, the elliptical arc ro2 having a large radius with the major axis in the vertical direction is arranged downward, and these elliptical arcs ro1 and ro2 are connected. Further, FIG. 2D shows an inverted triangular apex having a small radius arc rs1, and FIG. 2E shows a baseball baseball apex having a small radius arc rs1.

  The flow jet gate of the present invention can reduce the minimum flow rate control amount by simply making the shape of the spout 1a as shown in FIG. 1 or FIG. However, as shown in FIG. 3, when a notch 2b is formed in the lower end portion of the door body 2, the water discharge amount can be adjusted more accurately when a small amount of water is discharged.

  In the example shown in FIG. 3, when the door body 2 is raised from the fully closed state shown by the solid line in FIG. 3A to the position shown by the imaginary line in the case of a small amount of discharge, it is shown in FIGS. 1 and 2. Compared with the case where the door body 2 not provided with the notch is raised, the jet opening is added by the notch-shaped notch 2b.

  Accordingly, a region where the jet water vein at a minute opening, the water vein 4 from the lower end of the door body 2 and the water vein 4 from the ring seal 3 interfere with each other becomes narrow, and the hydraulic flow instability phenomenon is reduced. (Refer to FIGS. 3B and 3C).

  And at the time of this water discharge, the opening degree of the door body 2 and the water discharge flow rate are expressed by a continuous function, and the water vein 4 is continuous throughout the jet flow. As a result, the amount of discharged water can be easily adjusted.

  In addition, in the example shown in FIG. 3, since the notch 2b is notched, stress is not concentrated on the notch, and the rigidity of the door body 2 due to the notch 2b is less decreased. Therefore, the generation of vibration and noise is reduced during water discharge.

  In this case, when the outlet 1a of the discharge channel 1 has a shape in which the semicircular arcs rf1 and rf2 having the same radius are connected by the straight lines s1 and s2, the notched notch 2b is formed on the notch portion. When the width is the same as the width of the water discharge channel 1 and the notch diameter of the notch is larger than the width of the water discharge channel 1, preferably 1.5 times or more, a notch is provided. Further reduction in rigidity at both ends of the door body edge portion is further reduced.

  Incidentally, the conventional jet flow gate shown in FIG. 6 (referred to as standard in FIGS. 4 and 5) and the jet flow gate proposed in Patent Document 1 (referred to as notched triangle in FIGS. 4 and 5). The jet flow gate of the present invention shown in FIG. 1 (referred to as a long hole in FIGS. 4 and 5) and the jet flow gate of the present invention shown in FIG. 3 (long holes + arcs in FIGS. 4 and 5) FIG. 4 and FIG. 5 show the relationship between the gate opening and the opening area of the discharge port.

  When the opening of the door body is very small, as shown in FIG. 4, the jet flow gate proposed in Patent Document 1, the jet flow gate of the present invention shown in FIG. 3, the jet of the present invention shown in FIG. It can be seen that the opening accuracy is good in the order of the flow gate and the conventional jet flow gate.

  On the other hand, when the opening of the door increases, as shown in FIG. 5, the jet flow gate of the present invention shown in FIG. 3, the jet flow gate of the present invention shown in FIG. 1, and the jet proposed in Patent Document 1 It can be seen that the opening accuracy is good in the order of the flow gate and the conventional jet flow gate.

  As is clear from FIGS. 4 and 5, the jet flow gate of the present invention is slightly inferior to the jet flow gate proposed in Patent Document 1 when the door has a small opening. When the opening degree of the door body is large, it is better than the jet flow gate proposed in Patent Document 1 as well as the conventional jet flow gate.

  The present invention is not limited to the above example, and the opening and closing of the door body is not limited to the hydraulic cylinder, but may be performed using a spindle or a rack. Needless to say, the embodiments may be appropriately changed within the scope.

  The present invention is not limited to gates used for water discharge, and can be applied to all types of gates.

BRIEF DESCRIPTION OF THE DRAWINGS It is the schematic explaining the 1st example of this invention, (a) is the figure at the time of the door closing seen from the front, (b) is the figure at the time of the minute water discharge seen from the front. (A)-(e) is a figure explaining the 2nd-6th example of this invention. It is a figure explaining the 7th example of this invention, (a) is the figure seen from the front, (b) is AA sectional drawing of (a), (c) is BB sectional drawing of (a). It is. It is the figure which showed the relationship between the gate opening degree and the opening area of a spout of the conventional, patent document 1, and the jet flow gate of this invention, and is the figure which showed the case of a micro opening degree. It is the figure which showed the relationship between the gate opening degree and the opening area of a spout of the conventional, patent document 1, and the jet flow gate of this invention, and the figure which showed the case where an opening degree is large. It is explanatory drawing of the conventional jet flow gate, (a) is the figure seen from the front, (b) is explanatory drawing of the interference area | region of a vertical water vein, (c) is a side view of (a). It is principal part explanatory drawing of the jet flow gate proposed by patent document 1, (a) is the figure seen from the front, (b) is an enlarged view of a notch part. It is explanatory drawing of the jet flow gate proposed by patent document 1, (a) is AA sectional drawing of FIG.7 (b), (b) is BB sectional drawing of FIG.7 (b).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Flow path for water discharge 1a Outlet 2 Door body 2b Notch-shaped notch 3 Ring seal rf1, rf2 Semicircular arc r1, r2 Arc ro1, ro2 Elliptical arc s1, s2 Straight line

Claims (4)

  1. In the jet flow gate provided with a door body that is provided so as to be movable in the radial direction of the cylindrical valve body interposed in the water discharge flow path, and opens and closes the water discharge flow path,
    The jet flow gate characterized in that the outlet shape of the water discharge channel facing the door body is formed by connecting a semicircular arc of the same radius arranged vertically with a straight line.
  2. In the jet flow gate provided with a door body that is provided so as to be movable in the radial direction of the cylindrical valve body interposed in the water discharge flow path, and opens and closes the water discharge flow path,
    A jet flow gate characterized in that the outlet shape of the water discharge channel facing the door body is an elliptical shape having a major axis in the vertical direction.
  3. In the jet flow gate provided with a door body that is provided so as to be movable in the radial direction of the cylindrical valve body interposed in the water discharge flow path, and opens and closes the water discharge flow path,
    The outlet shape of the water discharge channel facing the door body is symmetrical only to the left and right, and the distance in the width direction decreases from the middle part of the outlet, or downward from the middle part of the outlet. However, the jet flow gate is characterized in that it has a shape connected using one of an arc, an elliptical arc, and a straight line so as to decrease as it goes downward after maintaining the same width.
  4. The edge part of the said door body was located outside the water discharge flow path at the time of a door closing, and formed the notch-shaped notch which opens a water discharge flow path with opening operation | movement. A jet flow gate according to any one of the above.
JP2005361675A 2005-09-05 2005-12-15 Jet flow gate Pending JP2007092507A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP2005256624 2005-09-05
JP2005361675A JP2007092507A (en) 2005-09-05 2005-12-15 Jet flow gate

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Application Number Priority Date Filing Date Title
JP2005361675A JP2007092507A (en) 2005-09-05 2005-12-15 Jet flow gate

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015053054A1 (en) * 2013-10-11 2015-04-16 株式会社メトラン Opening and closing device and breathing assistance device
US9279752B2 (en) 2011-06-03 2016-03-08 Fei Company Method for preparing thin samples for TEM imaging

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56100537U (en) * 1979-12-28 1981-08-07
JPS6353077U (en) * 1986-09-24 1988-04-09
JPH0539873A (en) * 1991-08-05 1993-02-19 Sekisui Chem Co Ltd Gate valve
JP2002013127A (en) * 2000-06-30 2002-01-18 Hitachi Zosen Corp Jet flow gate

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56100537U (en) * 1979-12-28 1981-08-07
JPS6353077U (en) * 1986-09-24 1988-04-09
JPH0539873A (en) * 1991-08-05 1993-02-19 Sekisui Chem Co Ltd Gate valve
JP2002013127A (en) * 2000-06-30 2002-01-18 Hitachi Zosen Corp Jet flow gate

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9279752B2 (en) 2011-06-03 2016-03-08 Fei Company Method for preparing thin samples for TEM imaging
WO2015053054A1 (en) * 2013-10-11 2015-04-16 株式会社メトラン Opening and closing device and breathing assistance device

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